From e5b5d25444e9ee3ae439720e62769517d331fa39 Mon Sep 17 00:00:00 2001
From: Adam Borowski <kilobyte@angband.pl>
Date: Mon, 15 Nov 2021 18:32:08 +0100
Subject: ACPI: thermal: drop an always true check

Address of a field inside a struct can't possibly be null; gcc-12 warns
about this.

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/thermal.c | 2 --
 1 file changed, 2 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 95105db642b9..155bbabcc6f5 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -1098,8 +1098,6 @@ static int acpi_thermal_resume(struct device *dev)
 		return -EINVAL;
 
 	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
-		if (!(&tz->trips.active[i]))
-			break;
 		if (!tz->trips.active[i].flags.valid)
 			break;
 		tz->trips.active[i].flags.enabled = 1;
-- 
cgit v1.2.3


From 5b6a8f1445bc86e221da85bb67f389c3ab6d2037 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 16 Nov 2021 21:06:17 +0100
Subject: ACPI: PM: Emit debug messages when enabling/disabling wakeup power

Print additional debug messages when enabling and disabling wakeup
power for an ACPI device object to facilitate more fine-grained
debugging of problems in that area.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/power.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 5dcb02ededbc..7945e60f9b6a 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -716,6 +716,9 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
 
 	mutex_lock(&acpi_device_lock);
 
+	dev_dbg(&dev->dev, "Enabling wakeup power (count %d)\n",
+		dev->wakeup.prepare_count);
+
 	if (dev->wakeup.prepare_count++)
 		goto out;
 
@@ -734,8 +737,11 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
 	if (err) {
 		acpi_power_off_list(&dev->wakeup.resources);
 		dev->wakeup.prepare_count = 0;
+		goto out;
 	}
 
+	dev_dbg(&dev->dev, "Wakeup power enabled\n");
+
  out:
 	mutex_unlock(&acpi_device_lock);
 	return err;
@@ -757,6 +763,9 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev)
 
 	mutex_lock(&acpi_device_lock);
 
+	dev_dbg(&dev->dev, "Disabling wakeup power (count %d)\n",
+		dev->wakeup.prepare_count);
+
 	/* Do nothing if wakeup power has not been enabled for this device. */
 	if (dev->wakeup.prepare_count <= 0)
 		goto out;
@@ -782,8 +791,11 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev)
 	if (err) {
 		dev_err(&dev->dev, "Cannot turn off wakeup power resources\n");
 		dev->wakeup.flags.valid = 0;
+		goto out;
 	}
 
+	dev_dbg(&dev->dev, "Wakeup power disabled\n");
+
  out:
 	mutex_unlock(&acpi_device_lock);
 	return err;
-- 
cgit v1.2.3


From 75f32fa3a6fbaed25ad741221ab60bb4b08d7656 Mon Sep 17 00:00:00 2001
From: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
Date: Fri, 12 Nov 2021 17:30:29 +0530
Subject: ACPI: DPTF: Update device ID in a comment

There is a comment in dptf_pch_fivr.c which seemingly was added under
the assumption that the PCH FIVR driver would be used on Tiger Lake
platforms, but support for Alder Lake has been udded to it by commit
38748bcb940e ("ACPI: DPTF: Support Alder Lake"), so update the
comment to cover a broader range of platforms by changing the device
ID mentioned by it to INTC10xx.

Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
[ rjw: Subject and changelog rewrite ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/dptf/dptf_pch_fivr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/dptf/dptf_pch_fivr.c b/drivers/acpi/dptf/dptf_pch_fivr.c
index f4e9c2ef2f88..e7ab0fc90db9 100644
--- a/drivers/acpi/dptf/dptf_pch_fivr.c
+++ b/drivers/acpi/dptf/dptf_pch_fivr.c
@@ -46,7 +46,7 @@ release_buffer:
 }
 
 /*
- * Presentation of attributes which are defined for INT1045
+ * Presentation of attributes which are defined for INTC10xx
  * They are:
  * freq_mhz_low_clock : Set PCH FIVR switching freq for
  *			FIVR clock 19.2MHz and 24MHz
-- 
cgit v1.2.3


From 0e6078c3c6737df7d0bd0c890fbadf24a27fffbb Mon Sep 17 00:00:00 2001
From: Guo Zhengkui <guozhengkui@vivo.com>
Date: Tue, 9 Nov 2021 15:50:51 +0800
Subject: ACPI: processor idle: Use swap() instead of open coding it

Address the following coccicheck warning:

./drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c:914:40-41:
WARNING opportunity for swap().

by using swap() for the swapping of variable values and drop
the tmp variable that is not needed any more.

Signed-off-by: Guo Zhengkui <guozhengkui@vivo.com>
[ rjw: Subject and changelog rewrite ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/processor_idle.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 76ef1bcc8848..4b906bb527e8 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -20,6 +20,7 @@
 #include <linux/tick.h>
 #include <linux/cpuidle.h>
 #include <linux/cpu.h>
+#include <linux/minmax.h>
 #include <acpi/processor.h>
 
 /*
@@ -400,13 +401,10 @@ static int acpi_cst_latency_cmp(const void *a, const void *b)
 static void acpi_cst_latency_swap(void *a, void *b, int n)
 {
 	struct acpi_processor_cx *x = a, *y = b;
-	u32 tmp;
 
 	if (!(x->valid && y->valid))
 		return;
-	tmp = x->latency;
-	x->latency = y->latency;
-	y->latency = tmp;
+	swap(x->latency, y->latency);
 }
 
 static int acpi_processor_power_verify(struct acpi_processor *pr)
-- 
cgit v1.2.3


From e38f9ff63e6d403f8e52302d223e3c5c110872ee Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 26 Oct 2021 20:57:31 +0200
Subject: ACPI: scan: Do not add device IDs from _CID if _HID is not valid

Section 6.1.2 of ACPI 6.4 explicitly requires _HID to be present for
_CID to be defined, so don't add device IDs from _CID to the device
IDs list of a device if _HID is not valid.

Link: https://uefi.org/specs/ACPI/6.4/06_Device_Configuration/Device_Configuration.html#cid-compatible-id
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/acpi/scan.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 2c80765670bc..5991dddbc9ce 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1340,11 +1340,11 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
 		if (info->valid & ACPI_VALID_HID) {
 			acpi_add_id(pnp, info->hardware_id.string);
 			pnp->type.platform_id = 1;
-		}
-		if (info->valid & ACPI_VALID_CID) {
-			cid_list = &info->compatible_id_list;
-			for (i = 0; i < cid_list->count; i++)
-				acpi_add_id(pnp, cid_list->ids[i].string);
+			if (info->valid & ACPI_VALID_CID) {
+				cid_list = &info->compatible_id_list;
+				for (i = 0; i < cid_list->count; i++)
+					acpi_add_id(pnp, cid_list->ids[i].string);
+			}
 		}
 		if (info->valid & ACPI_VALID_ADR) {
 			pnp->bus_address = info->address;
-- 
cgit v1.2.3


From d431dfb764b145369be820fcdfd50f2159b9bbc2 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 22 Nov 2021 18:05:30 +0100
Subject: ACPI / x86: Drop PWM2 device on Lenovo Yoga Book from always present
 table

It turns out that there is a WMI object which controls the PWM2 device
used for the keyboard backlight and that WMI object also provides some
other useful functionality.

The upcoming lenovo-yogabook-wmi driver will offer both backlight
control and the other functionality, so there no longer is a need
to have the lpss-pwm driver binding to PWM2 for backlight control;
and this is now actually undesirable because this will cause both
the WMI code and the lpss-pwm driver to poke at the same PWM
controller.

Drop the always-present quirk for the PWM2 ACPI-device, so that the
 lpss-pwm controller will no longer bind to it.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/x86/utils.c | 4 ----
 1 file changed, 4 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index f22f23933063..3bcac98f6eca 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -54,10 +54,6 @@ static const struct always_present_id always_present_ids[] = {
 	ENTRY("80860F09", "1", X86_MATCH(ATOM_SILVERMONT), {}),
 	ENTRY("80862288", "1", X86_MATCH(ATOM_AIRMONT), {}),
 
-	/* Lenovo Yoga Book uses PWM2 for keyboard backlight control */
-	ENTRY("80862289", "2", X86_MATCH(ATOM_AIRMONT), {
-			DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X9"),
-		}),
 	/*
 	 * The INT0002 device is necessary to clear wakeup interrupt sources
 	 * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
-- 
cgit v1.2.3


From 1a68b346a2c9969c05e80a3b99a9ab160b5655c0 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 22 Nov 2021 18:05:31 +0100
Subject: ACPI: Change acpi_device_always_present() into
 acpi_device_override_status()

Currently, acpi_bus_get_status() calls acpi_device_always_present() to
allow platform quirks to override the _STA return to report that a
device is present (status = ACPI_STA_DEFAULT) independent of the _STA
return.

In some cases it might also be useful to have the opposite functionality
and have a platform quirk which marks a device as not present (status = 0)
to work around ACPI table bugs.

Change acpi_device_always_present() into a more generic
acpi_device_override_status() function to allow this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/bus.c       |  4 +--
 drivers/acpi/x86/utils.c | 64 ++++++++++++++++++++++++++++--------------------
 include/acpi/acpi_bus.h  |  5 ++--
 3 files changed, 42 insertions(+), 31 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index fa923a929224..dd535b4b9a16 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -98,8 +98,8 @@ int acpi_bus_get_status(struct acpi_device *device)
 	acpi_status status;
 	unsigned long long sta;
 
-	if (acpi_device_always_present(device)) {
-		acpi_set_device_status(device, ACPI_STA_DEFAULT);
+	if (acpi_device_override_status(device, &sta)) {
+		acpi_set_device_status(device, sta);
 		return 0;
 	}
 
diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index 3bcac98f6eca..edb4f3fd93dc 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -22,54 +22,63 @@
  * Some BIOS-es (temporarily) hide specific APCI devices to work around Windows
  * driver bugs. We use DMI matching to match known cases of this.
  *
- * We work around this by always reporting ACPI_STA_DEFAULT for these
- * devices. Note this MUST only be done for devices where this is safe.
+ * Likewise sometimes some not-actually present devices are sometimes
+ * reported as present, which may cause issues.
  *
- * This forcing of devices to be present is limited to specific CPU (SoC)
- * models both to avoid potentially causing trouble on other models and
- * because some HIDs are re-used on different SoCs for completely
- * different devices.
+ * We work around this by using the below quirk list to override the status
+ * reported by the _STA method with a fixed value (ACPI_STA_DEFAULT or 0).
+ * Note this MUST only be done for devices where this is safe.
+ *
+ * This status overriding is limited to specific CPU (SoC) models both to
+ * avoid potentially causing trouble on other models and because some HIDs
+ * are re-used on different SoCs for completely different devices.
  */
-struct always_present_id {
+struct override_status_id {
 	struct acpi_device_id hid[2];
 	struct x86_cpu_id cpu_ids[2];
 	struct dmi_system_id dmi_ids[2]; /* Optional */
 	const char *uid;
+	unsigned long long status;
 };
 
-#define X86_MATCH(model)	X86_MATCH_INTEL_FAM6_MODEL(model, NULL)
-
-#define ENTRY(hid, uid, cpu_models, dmi...) {				\
+#define ENTRY(status, hid, uid, cpu_model, dmi...) {			\
 	{ { hid, }, {} },						\
-	{ cpu_models, {} },						\
+	{ X86_MATCH_INTEL_FAM6_MODEL(cpu_model, NULL), {} },		\
 	{ { .matches = dmi }, {} },					\
 	uid,								\
+	status,								\
 }
 
-static const struct always_present_id always_present_ids[] = {
+#define PRESENT_ENTRY_HID(hid, uid, cpu_model, dmi...) \
+	ENTRY(ACPI_STA_DEFAULT, hid, uid, cpu_model, dmi)
+
+#define NOT_PRESENT_ENTRY_HID(hid, uid, cpu_model, dmi...) \
+	ENTRY(0, hid, uid, cpu_model, dmi)
+
+static const struct override_status_id override_status_ids[] = {
 	/*
 	 * Bay / Cherry Trail PWM directly poked by GPU driver in win10,
 	 * but Linux uses a separate PWM driver, harmless if not used.
 	 */
-	ENTRY("80860F09", "1", X86_MATCH(ATOM_SILVERMONT), {}),
-	ENTRY("80862288", "1", X86_MATCH(ATOM_AIRMONT), {}),
+	PRESENT_ENTRY_HID("80860F09", "1", ATOM_SILVERMONT, {}),
+	PRESENT_ENTRY_HID("80862288", "1", ATOM_AIRMONT, {}),
 
 	/*
 	 * The INT0002 device is necessary to clear wakeup interrupt sources
 	 * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
 	 */
-	ENTRY("INT0002", "1", X86_MATCH(ATOM_AIRMONT), {}),
+	PRESENT_ENTRY_HID("INT0002", "1", ATOM_AIRMONT, {}),
 	/*
 	 * On the Dell Venue 11 Pro 7130 and 7139, the DSDT hides
 	 * the touchscreen ACPI device until a certain time
 	 * after _SB.PCI0.GFX0.LCD.LCD1._ON gets called has passed
 	 * *and* _STA has been called at least 3 times since.
 	 */
-	ENTRY("SYNA7500", "1", X86_MATCH(HASWELL_L), {
+	PRESENT_ENTRY_HID("SYNA7500", "1", HASWELL_L, {
 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 		DMI_MATCH(DMI_PRODUCT_NAME, "Venue 11 Pro 7130"),
 	      }),
-	ENTRY("SYNA7500", "1", X86_MATCH(HASWELL_L), {
+	PRESENT_ENTRY_HID("SYNA7500", "1", HASWELL_L, {
 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 		DMI_MATCH(DMI_PRODUCT_NAME, "Venue 11 Pro 7139"),
 	      }),
@@ -85,19 +94,19 @@ static const struct always_present_id always_present_ids[] = {
 	 * was copy-pasted from the GPD win, so it has a disabled KIOX000A
 	 * node which we should not enable, thus we also check the BIOS date.
 	 */
-	ENTRY("KIOX000A", "1", X86_MATCH(ATOM_AIRMONT), {
+	PRESENT_ENTRY_HID("KIOX000A", "1", ATOM_AIRMONT, {
 		DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
 		DMI_MATCH(DMI_BOARD_NAME, "Default string"),
 		DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
 		DMI_MATCH(DMI_BIOS_DATE, "02/21/2017")
 	      }),
-	ENTRY("KIOX000A", "1", X86_MATCH(ATOM_AIRMONT), {
+	PRESENT_ENTRY_HID("KIOX000A", "1", ATOM_AIRMONT, {
 		DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
 		DMI_MATCH(DMI_BOARD_NAME, "Default string"),
 		DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
 		DMI_MATCH(DMI_BIOS_DATE, "03/20/2017")
 	      }),
-	ENTRY("KIOX000A", "1", X86_MATCH(ATOM_AIRMONT), {
+	PRESENT_ENTRY_HID("KIOX000A", "1", ATOM_AIRMONT, {
 		DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
 		DMI_MATCH(DMI_BOARD_NAME, "Default string"),
 		DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
@@ -105,26 +114,27 @@ static const struct always_present_id always_present_ids[] = {
 	      }),
 };
 
-bool acpi_device_always_present(struct acpi_device *adev)
+bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *status)
 {
 	bool ret = false;
 	unsigned int i;
 
-	for (i = 0; i < ARRAY_SIZE(always_present_ids); i++) {
-		if (acpi_match_device_ids(adev, always_present_ids[i].hid))
+	for (i = 0; i < ARRAY_SIZE(override_status_ids); i++) {
+		if (acpi_match_device_ids(adev, override_status_ids[i].hid))
 			continue;
 
 		if (!adev->pnp.unique_id ||
-		    strcmp(adev->pnp.unique_id, always_present_ids[i].uid))
+		    strcmp(adev->pnp.unique_id, override_status_ids[i].uid))
 			continue;
 
-		if (!x86_match_cpu(always_present_ids[i].cpu_ids))
+		if (!x86_match_cpu(override_status_ids[i].cpu_ids))
 			continue;
 
-		if (always_present_ids[i].dmi_ids[0].matches[0].slot &&
-		    !dmi_check_system(always_present_ids[i].dmi_ids))
+		if (override_status_ids[i].dmi_ids[0].matches[0].slot &&
+		    !dmi_check_system(override_status_ids[i].dmi_ids))
 			continue;
 
+		*status = override_status_ids[i].status;
 		ret = true;
 		break;
 	}
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 480f9207a4c6..d6fe27b695c3 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -613,9 +613,10 @@ int acpi_enable_wakeup_device_power(struct acpi_device *dev, int state);
 int acpi_disable_wakeup_device_power(struct acpi_device *dev);
 
 #ifdef CONFIG_X86
-bool acpi_device_always_present(struct acpi_device *adev);
+bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *status);
 #else
-static inline bool acpi_device_always_present(struct acpi_device *adev)
+static inline bool acpi_device_override_status(struct acpi_device *adev,
+					       unsigned long long *status)
 {
 	return false;
 }
-- 
cgit v1.2.3


From ba46e42e925b5d09b4e441f8de3db119cc7df58f Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 22 Nov 2021 18:05:32 +0100
Subject: ACPI / x86: Allow specifying acpi_device_override_status() quirks by
 path

Not all ACPI-devices have a HID + UID, allow specifying quirks for
acpi_device_override_status() by path too.

Note this moves the path/HID+UID check to after the CPU + DMI checks
since the path lookup is somewhat costly.

This way this lookup is only done on devices where the other checks
match.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/x86/utils.c | 42 ++++++++++++++++++++++++++++++++----------
 1 file changed, 32 insertions(+), 10 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index edb4f3fd93dc..190bfc2ab3f2 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -38,22 +38,30 @@ struct override_status_id {
 	struct x86_cpu_id cpu_ids[2];
 	struct dmi_system_id dmi_ids[2]; /* Optional */
 	const char *uid;
+	const char *path;
 	unsigned long long status;
 };
 
-#define ENTRY(status, hid, uid, cpu_model, dmi...) {			\
+#define ENTRY(status, hid, uid, path, cpu_model, dmi...) {		\
 	{ { hid, }, {} },						\
 	{ X86_MATCH_INTEL_FAM6_MODEL(cpu_model, NULL), {} },		\
 	{ { .matches = dmi }, {} },					\
 	uid,								\
+	path,								\
 	status,								\
 }
 
 #define PRESENT_ENTRY_HID(hid, uid, cpu_model, dmi...) \
-	ENTRY(ACPI_STA_DEFAULT, hid, uid, cpu_model, dmi)
+	ENTRY(ACPI_STA_DEFAULT, hid, uid, NULL, cpu_model, dmi)
 
 #define NOT_PRESENT_ENTRY_HID(hid, uid, cpu_model, dmi...) \
-	ENTRY(0, hid, uid, cpu_model, dmi)
+	ENTRY(0, hid, uid, NULL, cpu_model, dmi)
+
+#define PRESENT_ENTRY_PATH(path, cpu_model, dmi...) \
+	ENTRY(ACPI_STA_DEFAULT, "", NULL, path, cpu_model, dmi)
+
+#define NOT_PRESENT_ENTRY_PATH(path, cpu_model, dmi...) \
+	ENTRY(0, "", NULL, path, cpu_model, dmi)
 
 static const struct override_status_id override_status_ids[] = {
 	/*
@@ -120,13 +128,6 @@ bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *s
 	unsigned int i;
 
 	for (i = 0; i < ARRAY_SIZE(override_status_ids); i++) {
-		if (acpi_match_device_ids(adev, override_status_ids[i].hid))
-			continue;
-
-		if (!adev->pnp.unique_id ||
-		    strcmp(adev->pnp.unique_id, override_status_ids[i].uid))
-			continue;
-
 		if (!x86_match_cpu(override_status_ids[i].cpu_ids))
 			continue;
 
@@ -134,6 +135,27 @@ bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *s
 		    !dmi_check_system(override_status_ids[i].dmi_ids))
 			continue;
 
+		if (override_status_ids[i].path) {
+			struct acpi_buffer path = { ACPI_ALLOCATE_BUFFER, NULL };
+			bool match;
+
+			if (acpi_get_name(adev->handle, ACPI_FULL_PATHNAME, &path))
+				continue;
+
+			match = strcmp((char *)path.pointer, override_status_ids[i].path) == 0;
+			kfree(path.pointer);
+
+			if (!match)
+				continue;
+		} else {
+			if (acpi_match_device_ids(adev, override_status_ids[i].hid))
+				continue;
+
+			if (!adev->pnp.unique_id ||
+			    strcmp(adev->pnp.unique_id, override_status_ids[i].uid))
+				continue;
+		}
+
 		*status = override_status_ids[i].status;
 		ret = true;
 		break;
-- 
cgit v1.2.3


From 57d2dbf710d832841872fb15ebb79429cab90fae Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 22 Nov 2021 18:05:33 +0100
Subject: ACPI / x86: Add not-present quirk for the PCI0.SDHB.BRC1 device on
 the GPD win

The GPD win and its sibling the GPD pocket (99% the same electronics in a
different case) use a PCI wifi card. But the ACPI tables on both variants
contain a bug where the SDIO MMC controller for SDIO wifi cards is enabled
despite this. This SDIO MMC controller has a PCI0.SDHB.BRC1 child-device
which _PS3 method sets a GPIO causing the PCI wifi card to turn off.

At the moment there is a pretty ugly kludge in the sdhci-acpi.c code,
just to work around the bug in the DSDT of this single design. This can
be solved cleaner/simply with a quirk overriding the _STA return of the
broken PCI0.SDHB.BRC1 PCI0.SDHB.BRC1 child with a status value of 0,
so that its power_manageable flag gets cleared, avoiding this problem.

Note that even though it is not used, the _STA method for the MMC
controller is deliberately not overridden. If the status of the MMC
controller were forced to 0 it would never get suspended, which would
cause these mini-laptops to not reach S0i3 level when suspended.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/x86/utils.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index 190bfc2ab3f2..b3fb428461c6 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -94,9 +94,10 @@ static const struct override_status_id override_status_ids[] = {
 	/*
 	 * The GPD win BIOS dated 20170221 has disabled the accelerometer, the
 	 * drivers sometimes cause crashes under Windows and this is how the
-	 * manufacturer has solved this :| Note that the the DMI data is less
-	 * generic then it seems, a board_vendor of "AMI Corporation" is quite
-	 * rare and a board_name of "Default String" also is rare.
+	 * manufacturer has solved this :|  The DMI match may not seem unique,
+	 * but it is. In the 67000+ DMI decode dumps from linux-hardware.org
+	 * only 116 have board_vendor set to "AMI Corporation" and of those 116
+	 * only the GPD win and pocket entries' board_name is "Default string".
 	 *
 	 * Unfortunately the GPD pocket also uses these strings and its BIOS
 	 * was copy-pasted from the GPD win, so it has a disabled KIOX000A
@@ -120,6 +121,19 @@ static const struct override_status_id override_status_ids[] = {
 		DMI_MATCH(DMI_PRODUCT_NAME, "Default string"),
 		DMI_MATCH(DMI_BIOS_DATE, "05/25/2017")
 	      }),
+
+	/*
+	 * The GPD win/pocket have a PCI wifi card, but its DSDT has the SDIO
+	 * mmc controller enabled and that has a child-device which _PS3
+	 * method sets a GPIO causing the PCI wifi card to turn off.
+	 * See above remark about uniqueness of the DMI match.
+	 */
+	NOT_PRESENT_ENTRY_PATH("\\_SB_.PCI0.SDHB.BRC1", ATOM_AIRMONT, {
+		DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
+		DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
+		DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
+		DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
+	      }),
 };
 
 bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *status)
-- 
cgit v1.2.3


From b72cd8e0fa34d5491232c64b88e3eda35436eb57 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 22 Nov 2021 18:05:34 +0100
Subject: ACPI / x86: Add PWM2 on the Xiaomi Mi Pad 2 to the always_present
 list

The Xiaomi Mi Pad 2 has backlit LEDs behind the capacitive menu, home
and back buttons below the screen which are controlled by the PWM2
controller of the CHT SoC. This PWM2 controller gets hidden by the
firmware, add it to the always_present_ids table so that we can use
the PWM controller to control the backlighting of the buttons.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/x86/utils.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index b3fb428461c6..a2ae1ac41319 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -71,6 +71,12 @@ static const struct override_status_id override_status_ids[] = {
 	PRESENT_ENTRY_HID("80860F09", "1", ATOM_SILVERMONT, {}),
 	PRESENT_ENTRY_HID("80862288", "1", ATOM_AIRMONT, {}),
 
+	/* The Xiaomi Mi Pad 2 uses PWM2 for touchkeys backlight control */
+	PRESENT_ENTRY_HID("80862289", "2", ATOM_AIRMONT, {
+		DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
+	      }),
+
 	/*
 	 * The INT0002 device is necessary to clear wakeup interrupt sources
 	 * on Cherry Trail devices, without it we get nobody cared IRQ msgs.
-- 
cgit v1.2.3


From 4a9af6cac050dce2e895ec3205c4615383ad9112 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 23 Nov 2021 19:36:51 +0100
Subject: ACPI: EC: Rework flushing of EC work while suspended to idle

The flushing of pending work in the EC driver uses drain_workqueue()
to flush the event handling work that can requeue itself via
advance_transaction(), but this is problematic, because that
work may also be requeued from the query workqueue.

Namely, if an EC transaction is carried out during the execution of
a query handler, it involves calling advance_transaction() which
may queue up the event handling work again.  This causes the kernel
to complain about attempts to add a work item to the EC event
workqueue while it is being drained and worst-case it may cause a
valid event to be skipped.

To avoid this problem, introduce two new counters, events_in_progress
and queries_in_progress, incremented when a work item is queued on
the event workqueue or the query workqueue, respectively, and
decremented at the end of the corresponding work function, and make
acpi_ec_dispatch_gpe() the workqueues in a loop until the both of
these counters are zero (or system wakeup is pending) instead of
calling acpi_ec_flush_work().

At the same time, change __acpi_ec_flush_work() to call
flush_workqueue() instead of drain_workqueue() to flush the event
workqueue.

While at it, use the observation that the work item queued in
acpi_ec_query() cannot be pending at that time, because it is used
only once, to simplify the code in there.

Additionally, clean up a comment in acpi_ec_query() and adjust white
space in acpi_ec_event_processor().

Fixes: f0ac20c3f613 ("ACPI: EC: Fix flushing of pending work")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ec.c       | 57 +++++++++++++++++++++++++++++++++++++------------
 drivers/acpi/internal.h |  2 ++
 2 files changed, 45 insertions(+), 14 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index a6366d3f0c78..b9c44e6c5e40 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -166,6 +166,7 @@ struct acpi_ec_query {
 	struct transaction transaction;
 	struct work_struct work;
 	struct acpi_ec_query_handler *handler;
+	struct acpi_ec *ec;
 };
 
 static int acpi_ec_query(struct acpi_ec *ec, u8 *data);
@@ -452,6 +453,7 @@ static void acpi_ec_submit_query(struct acpi_ec *ec)
 		ec_dbg_evt("Command(%s) submitted/blocked",
 			   acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY));
 		ec->nr_pending_queries++;
+		ec->events_in_progress++;
 		queue_work(ec_wq, &ec->work);
 	}
 }
@@ -518,7 +520,7 @@ static void acpi_ec_enable_event(struct acpi_ec *ec)
 #ifdef CONFIG_PM_SLEEP
 static void __acpi_ec_flush_work(void)
 {
-	drain_workqueue(ec_wq); /* flush ec->work */
+	flush_workqueue(ec_wq); /* flush ec->work */
 	flush_workqueue(ec_query_wq); /* flush queries */
 }
 
@@ -1103,7 +1105,7 @@ void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
 }
 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
 
-static struct acpi_ec_query *acpi_ec_create_query(u8 *pval)
+static struct acpi_ec_query *acpi_ec_create_query(struct acpi_ec *ec, u8 *pval)
 {
 	struct acpi_ec_query *q;
 	struct transaction *t;
@@ -1111,11 +1113,13 @@ static struct acpi_ec_query *acpi_ec_create_query(u8 *pval)
 	q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL);
 	if (!q)
 		return NULL;
+
 	INIT_WORK(&q->work, acpi_ec_event_processor);
 	t = &q->transaction;
 	t->command = ACPI_EC_COMMAND_QUERY;
 	t->rdata = pval;
 	t->rlen = 1;
+	q->ec = ec;
 	return q;
 }
 
@@ -1132,13 +1136,21 @@ static void acpi_ec_event_processor(struct work_struct *work)
 {
 	struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work);
 	struct acpi_ec_query_handler *handler = q->handler;
+	struct acpi_ec *ec = q->ec;
 
 	ec_dbg_evt("Query(0x%02x) started", handler->query_bit);
+
 	if (handler->func)
 		handler->func(handler->data);
 	else if (handler->handle)
 		acpi_evaluate_object(handler->handle, NULL, NULL, NULL);
+
 	ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit);
+
+	spin_lock_irq(&ec->lock);
+	ec->queries_in_progress--;
+	spin_unlock_irq(&ec->lock);
+
 	acpi_ec_delete_query(q);
 }
 
@@ -1148,7 +1160,7 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 *data)
 	int result;
 	struct acpi_ec_query *q;
 
-	q = acpi_ec_create_query(&value);
+	q = acpi_ec_create_query(ec, &value);
 	if (!q)
 		return -ENOMEM;
 
@@ -1170,19 +1182,20 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 *data)
 	}
 
 	/*
-	 * It is reported that _Qxx are evaluated in a parallel way on
-	 * Windows:
+	 * It is reported that _Qxx are evaluated in a parallel way on Windows:
 	 * https://bugzilla.kernel.org/show_bug.cgi?id=94411
 	 *
-	 * Put this log entry before schedule_work() in order to make
-	 * it appearing before any other log entries occurred during the
-	 * work queue execution.
+	 * Put this log entry before queue_work() to make it appear in the log
+	 * before any other messages emitted during workqueue handling.
 	 */
 	ec_dbg_evt("Query(0x%02x) scheduled", value);
-	if (!queue_work(ec_query_wq, &q->work)) {
-		ec_dbg_evt("Query(0x%02x) overlapped", value);
-		result = -EBUSY;
-	}
+
+	spin_lock_irq(&ec->lock);
+
+	ec->queries_in_progress++;
+	queue_work(ec_query_wq, &q->work);
+
+	spin_unlock_irq(&ec->lock);
 
 err_exit:
 	if (result)
@@ -1240,6 +1253,10 @@ static void acpi_ec_event_handler(struct work_struct *work)
 	ec_dbg_evt("Event stopped");
 
 	acpi_ec_check_event(ec);
+
+	spin_lock_irqsave(&ec->lock, flags);
+	ec->events_in_progress--;
+	spin_unlock_irqrestore(&ec->lock, flags);
 }
 
 static void acpi_ec_handle_interrupt(struct acpi_ec *ec)
@@ -2021,6 +2038,7 @@ void acpi_ec_set_gpe_wake_mask(u8 action)
 
 bool acpi_ec_dispatch_gpe(void)
 {
+	bool work_in_progress;
 	u32 ret;
 
 	if (!first_ec)
@@ -2041,8 +2059,19 @@ bool acpi_ec_dispatch_gpe(void)
 	if (ret == ACPI_INTERRUPT_HANDLED)
 		pm_pr_dbg("ACPI EC GPE dispatched\n");
 
-	/* Flush the event and query workqueues. */
-	acpi_ec_flush_work();
+	/* Drain EC work. */
+	do {
+		acpi_ec_flush_work();
+
+		pm_pr_dbg("ACPI EC work flushed\n");
+
+		spin_lock_irq(&first_ec->lock);
+
+		work_in_progress = first_ec->events_in_progress +
+			first_ec->queries_in_progress > 0;
+
+		spin_unlock_irq(&first_ec->lock);
+	} while (work_in_progress && !pm_wakeup_pending());
 
 	return false;
 }
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index d91b560e8867..54b2be94d23d 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -183,6 +183,8 @@ struct acpi_ec {
 	struct work_struct work;
 	unsigned long timestamp;
 	unsigned long nr_pending_queries;
+	unsigned int events_in_progress;
+	unsigned int queries_in_progress;
 	bool busy_polling;
 	unsigned int polling_guard;
 };
-- 
cgit v1.2.3


From ca8283dcd933a2ca776fade77fb4527321521463 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 23 Nov 2021 19:37:39 +0100
Subject: ACPI: EC: Call advance_transaction() from acpi_ec_dispatch_gpe()

Calling acpi_dispatch_gpe() from acpi_ec_dispatch_gpe() is generally
problematic, because it may cause the spurious interrupt handling in
advance_transaction() to trigger in theory.

However, instead of calling acpi_dispatch_gpe() to dispatch the EC
GPE, acpi_ec_dispatch_gpe() can call advance_transaction() directly
on first_ec and it can pass 'false' as its second argument to indicate
calling it from process context.

Moreover, if advance_transaction() is modified to return a bool value
indicating whether or not the EC work needs to be flushed, it can be
used to avoid unnecessary EC work flushing in acpi_ec_dispatch_gpe(),
so change the code accordingly.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ec.c | 39 ++++++++++++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 11 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index b9c44e6c5e40..bfc29cdfa5f0 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -170,7 +170,7 @@ struct acpi_ec_query {
 };
 
 static int acpi_ec_query(struct acpi_ec *ec, u8 *data);
-static void advance_transaction(struct acpi_ec *ec, bool interrupt);
+static bool advance_transaction(struct acpi_ec *ec, bool interrupt);
 static void acpi_ec_event_handler(struct work_struct *work);
 static void acpi_ec_event_processor(struct work_struct *work);
 
@@ -444,18 +444,25 @@ static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec)
 	return true;
 }
 
-static void acpi_ec_submit_query(struct acpi_ec *ec)
+static bool acpi_ec_submit_query(struct acpi_ec *ec)
 {
 	acpi_ec_mask_events(ec);
 	if (!acpi_ec_event_enabled(ec))
-		return;
+		return false;
+
 	if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) {
 		ec_dbg_evt("Command(%s) submitted/blocked",
 			   acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY));
 		ec->nr_pending_queries++;
 		ec->events_in_progress++;
-		queue_work(ec_wq, &ec->work);
+		return queue_work(ec_wq, &ec->work);
 	}
+
+	/*
+	 * The event handling work has not been completed yet, so it needs to be
+	 * flushed.
+	 */
+	return true;
 }
 
 static void acpi_ec_complete_query(struct acpi_ec *ec)
@@ -628,10 +635,11 @@ static void acpi_ec_spurious_interrupt(struct acpi_ec *ec, struct transaction *t
 		acpi_ec_mask_events(ec);
 }
 
-static void advance_transaction(struct acpi_ec *ec, bool interrupt)
+static bool advance_transaction(struct acpi_ec *ec, bool interrupt)
 {
 	struct transaction *t = ec->curr;
 	bool wakeup = false;
+	bool ret = false;
 	u8 status;
 
 	ec_dbg_stm("%s (%d)", interrupt ? "IRQ" : "TASK", smp_processor_id());
@@ -698,10 +706,12 @@ static void advance_transaction(struct acpi_ec *ec, bool interrupt)
 
 out:
 	if (status & ACPI_EC_FLAG_SCI)
-		acpi_ec_submit_query(ec);
+		ret = acpi_ec_submit_query(ec);
 
 	if (wakeup && interrupt)
 		wake_up(&ec->wait);
+
+	return ret;
 }
 
 static void start_transaction(struct acpi_ec *ec)
@@ -2038,8 +2048,7 @@ void acpi_ec_set_gpe_wake_mask(u8 action)
 
 bool acpi_ec_dispatch_gpe(void)
 {
-	bool work_in_progress;
-	u32 ret;
+	bool work_in_progress = false;
 
 	if (!first_ec)
 		return acpi_any_gpe_status_set(U32_MAX);
@@ -2055,9 +2064,17 @@ bool acpi_ec_dispatch_gpe(void)
 	 * Dispatch the EC GPE in-band, but do not report wakeup in any case
 	 * to allow the caller to process events properly after that.
 	 */
-	ret = acpi_dispatch_gpe(NULL, first_ec->gpe);
-	if (ret == ACPI_INTERRUPT_HANDLED)
-		pm_pr_dbg("ACPI EC GPE dispatched\n");
+	spin_lock_irq(&first_ec->lock);
+
+	if (acpi_ec_gpe_status_set(first_ec))
+		work_in_progress = advance_transaction(first_ec, false);
+
+	spin_unlock_irq(&first_ec->lock);
+
+	if (!work_in_progress)
+		return false;
+
+	pm_pr_dbg("ACPI EC GPE dispatched\n");
 
 	/* Drain EC work. */
 	do {
-- 
cgit v1.2.3


From 1f2350443dd21028d3de6907f98ff1be75a2c9bc Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 23 Nov 2021 19:38:21 +0100
Subject: ACPI: EC: Pass one argument to acpi_ec_query()

Notice that the second argument to acpi_ec_query() is redundant,
because in the only case when it is not NULL, the value passed
through it is only checked against 0 and it can only be 0 when
acpi_ec_query() returns an error code, but its return value
is checked along with the value passed through its second
argument.

Accordingly, modify acpi_ec_query() to take only one argument
and while at it, change its handling of the case when
acpi_ec_transaction() returns an error so as to return that
error value to the caller right away.

No expected functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ec.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index bfc29cdfa5f0..4b2573d85ac6 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -169,7 +169,7 @@ struct acpi_ec_query {
 	struct acpi_ec *ec;
 };
 
-static int acpi_ec_query(struct acpi_ec *ec, u8 *data);
+static int acpi_ec_query(struct acpi_ec *ec);
 static bool advance_transaction(struct acpi_ec *ec, bool interrupt);
 static void acpi_ec_event_handler(struct work_struct *work);
 static void acpi_ec_event_processor(struct work_struct *work);
@@ -496,12 +496,10 @@ static inline void __acpi_ec_disable_event(struct acpi_ec *ec)
  */
 static void acpi_ec_clear(struct acpi_ec *ec)
 {
-	int i, status;
-	u8 value = 0;
+	int i;
 
 	for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) {
-		status = acpi_ec_query(ec, &value);
-		if (status || !value)
+		if (acpi_ec_query(ec))
 			break;
 	}
 	if (unlikely(i == ACPI_EC_CLEAR_MAX))
@@ -1164,11 +1162,11 @@ static void acpi_ec_event_processor(struct work_struct *work)
 	acpi_ec_delete_query(q);
 }
 
-static int acpi_ec_query(struct acpi_ec *ec, u8 *data)
+static int acpi_ec_query(struct acpi_ec *ec)
 {
+	struct acpi_ec_query *q;
 	u8 value = 0;
 	int result;
-	struct acpi_ec_query *q;
 
 	q = acpi_ec_create_query(ec, &value);
 	if (!q)
@@ -1180,11 +1178,14 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 *data)
 	 * bit to be cleared (and thus clearing the interrupt source).
 	 */
 	result = acpi_ec_transaction(ec, &q->transaction);
-	if (!value)
-		result = -ENODATA;
 	if (result)
 		goto err_exit;
 
+	if (!value) {
+		result = -ENODATA;
+		goto err_exit;
+	}
+
 	q->handler = acpi_ec_get_query_handler_by_value(ec, value);
 	if (!q->handler) {
 		result = -ENODATA;
@@ -1210,8 +1211,7 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 *data)
 err_exit:
 	if (result)
 		acpi_ec_delete_query(q);
-	if (data)
-		*data = value;
+
 	return result;
 }
 
@@ -1243,7 +1243,9 @@ static void acpi_ec_event_handler(struct work_struct *work)
 	spin_lock_irqsave(&ec->lock, flags);
 	while (ec->nr_pending_queries) {
 		spin_unlock_irqrestore(&ec->lock, flags);
-		(void)acpi_ec_query(ec, NULL);
+
+		acpi_ec_query(ec);
+
 		spin_lock_irqsave(&ec->lock, flags);
 		ec->nr_pending_queries--;
 		/*
-- 
cgit v1.2.3


From 98d364509d77e2d441ef6d8bdf13e1a4258eac6c Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 23 Nov 2021 19:39:05 +0100
Subject: ACPI: EC: Fold acpi_ec_check_event() into acpi_ec_event_handler()

Because acpi_ec_event_handler() is the only caller of
acpi_ec_check_event() and the separation of these two functions
makes it harder to follow the code flow, fold the latter into the
former (and simplify that code while at it).

No expected functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ec.c | 28 +++++++++-------------------
 1 file changed, 9 insertions(+), 19 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 4b2573d85ac6..07506afa1fda 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1215,24 +1215,6 @@ err_exit:
 	return result;
 }
 
-static void acpi_ec_check_event(struct acpi_ec *ec)
-{
-	unsigned long flags;
-
-	if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT) {
-		if (ec_guard(ec)) {
-			spin_lock_irqsave(&ec->lock, flags);
-			/*
-			 * Take care of the SCI_EVT unless no one else is
-			 * taking care of it.
-			 */
-			if (!ec->curr)
-				advance_transaction(ec, false);
-			spin_unlock_irqrestore(&ec->lock, flags);
-		}
-	}
-}
-
 static void acpi_ec_event_handler(struct work_struct *work)
 {
 	unsigned long flags;
@@ -1264,7 +1246,15 @@ static void acpi_ec_event_handler(struct work_struct *work)
 
 	ec_dbg_evt("Event stopped");
 
-	acpi_ec_check_event(ec);
+	if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && ec_guard(ec)) {
+		spin_lock_irqsave(&ec->lock, flags);
+
+		/* Take care of SCI_EVT unless someone else is doing that. */
+		if (!ec->curr)
+			advance_transaction(ec, false);
+
+		spin_unlock_irqrestore(&ec->lock, flags);
+	}
 
 	spin_lock_irqsave(&ec->lock, flags);
 	ec->events_in_progress--;
-- 
cgit v1.2.3


From 388fb77dcf9793b9882e0f0651019f416ef50900 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 23 Nov 2021 19:40:04 +0100
Subject: ACPI: EC: Rearrange the loop in acpi_ec_event_handler()

It is not necessary to check ec->nr_pending_queries against 0 in the
while () loop in acpi_ec_event_handler(), because that loop terminates
when ec->nr_pending_queries is 0 and the code depending on that can be
run after the loop has ended.

Modify the code accordingly and while at it rewrite the comment
regarding that code to make it clearer.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ec.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 07506afa1fda..7582ef59b81f 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1230,18 +1230,17 @@ static void acpi_ec_event_handler(struct work_struct *work)
 
 		spin_lock_irqsave(&ec->lock, flags);
 		ec->nr_pending_queries--;
-		/*
-		 * Before exit, make sure that this work item can be
-		 * scheduled again. There might be QR_EC failures, leaving
-		 * EC_FLAGS_QUERY_PENDING uncleared and preventing this work
-		 * item from being scheduled again.
-		 */
-		if (!ec->nr_pending_queries) {
-			if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS ||
-			    ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY)
-				acpi_ec_complete_query(ec);
-		}
 	}
+
+	/*
+	 * Before exit, make sure that the it will be possible to queue up the
+	 * event handling work again regardless of whether or not the query
+	 * queued up above is processed successfully.
+	 */
+	if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS ||
+	    ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY)
+		acpi_ec_complete_query(ec);
+
 	spin_unlock_irqrestore(&ec->lock, flags);
 
 	ec_dbg_evt("Event stopped");
-- 
cgit v1.2.3


From a105acd7e38436ed6bc0714f3120aaaad56cbe3d Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 23 Nov 2021 19:40:50 +0100
Subject: ACPI: EC: Simplify locking in acpi_ec_event_handler()

Because acpi_ec_event_handler() is a work function, it always
runs in process context with interrupts enabled, so it can use
spin_lock_irq() and spin_unlock_irq() for the locking.

Make it do so and adjust white space around those calls.

No expected functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ec.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 7582ef59b81f..6fbd8521b901 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1217,18 +1217,18 @@ err_exit:
 
 static void acpi_ec_event_handler(struct work_struct *work)
 {
-	unsigned long flags;
 	struct acpi_ec *ec = container_of(work, struct acpi_ec, work);
 
 	ec_dbg_evt("Event started");
 
-	spin_lock_irqsave(&ec->lock, flags);
+	spin_lock_irq(&ec->lock);
+
 	while (ec->nr_pending_queries) {
-		spin_unlock_irqrestore(&ec->lock, flags);
+		spin_unlock_irq(&ec->lock);
 
 		acpi_ec_query(ec);
 
-		spin_lock_irqsave(&ec->lock, flags);
+		spin_lock_irq(&ec->lock);
 		ec->nr_pending_queries--;
 	}
 
@@ -1241,23 +1241,23 @@ static void acpi_ec_event_handler(struct work_struct *work)
 	    ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY)
 		acpi_ec_complete_query(ec);
 
-	spin_unlock_irqrestore(&ec->lock, flags);
+	spin_unlock_irq(&ec->lock);
 
 	ec_dbg_evt("Event stopped");
 
 	if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && ec_guard(ec)) {
-		spin_lock_irqsave(&ec->lock, flags);
+		spin_lock_irq(&ec->lock);
 
 		/* Take care of SCI_EVT unless someone else is doing that. */
 		if (!ec->curr)
 			advance_transaction(ec, false);
 
-		spin_unlock_irqrestore(&ec->lock, flags);
+		spin_unlock_irq(&ec->lock);
 	}
 
-	spin_lock_irqsave(&ec->lock, flags);
+	spin_lock_irq(&ec->lock);
 	ec->events_in_progress--;
-	spin_unlock_irqrestore(&ec->lock, flags);
+	spin_unlock_irq(&ec->lock);
 }
 
 static void acpi_ec_handle_interrupt(struct acpi_ec *ec)
-- 
cgit v1.2.3


From eafe7509ab8c8a200a169bc378fc9a56164acc66 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 23 Nov 2021 19:42:02 +0100
Subject: ACPI: EC: Rename three functions

Rename acpi_ec_submit_query() to acpi_ec_submit_event(),
acpi_ec_query() to acpi_ec_submit_query(), and
acpi_ec_complete_query() to acpi_ec_close_event() to make
the names reflect what the functions do.

No expected functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ec.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 6fbd8521b901..473b1d8617b5 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -169,7 +169,7 @@ struct acpi_ec_query {
 	struct acpi_ec *ec;
 };
 
-static int acpi_ec_query(struct acpi_ec *ec);
+static int acpi_ec_submit_query(struct acpi_ec *ec);
 static bool advance_transaction(struct acpi_ec *ec, bool interrupt);
 static void acpi_ec_event_handler(struct work_struct *work);
 static void acpi_ec_event_processor(struct work_struct *work);
@@ -444,7 +444,7 @@ static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec)
 	return true;
 }
 
-static bool acpi_ec_submit_query(struct acpi_ec *ec)
+static bool acpi_ec_submit_event(struct acpi_ec *ec)
 {
 	acpi_ec_mask_events(ec);
 	if (!acpi_ec_event_enabled(ec))
@@ -465,7 +465,7 @@ static bool acpi_ec_submit_query(struct acpi_ec *ec)
 	return true;
 }
 
-static void acpi_ec_complete_query(struct acpi_ec *ec)
+static void acpi_ec_close_event(struct acpi_ec *ec)
 {
 	if (test_and_clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
 		ec_dbg_evt("Command(%s) unblocked",
@@ -499,7 +499,7 @@ static void acpi_ec_clear(struct acpi_ec *ec)
 	int i;
 
 	for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) {
-		if (acpi_ec_query(ec))
+		if (acpi_ec_submit_query(ec))
 			break;
 	}
 	if (unlikely(i == ACPI_EC_CLEAR_MAX))
@@ -613,10 +613,10 @@ static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long f
 	if (ec->curr->command == ACPI_EC_COMMAND_QUERY) {
 		if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS &&
 		    flag == ACPI_EC_COMMAND_POLL)
-			acpi_ec_complete_query(ec);
+			acpi_ec_close_event(ec);
 		if (ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY &&
 		    flag == ACPI_EC_COMMAND_COMPLETE)
-			acpi_ec_complete_query(ec);
+			acpi_ec_close_event(ec);
 		if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT &&
 		    flag == ACPI_EC_COMMAND_COMPLETE)
 			set_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags);
@@ -668,7 +668,7 @@ static bool advance_transaction(struct acpi_ec *ec, bool interrupt)
 		    (!ec->nr_pending_queries ||
 		     test_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags))) {
 			clear_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags);
-			acpi_ec_complete_query(ec);
+			acpi_ec_close_event(ec);
 		}
 		if (!t)
 			goto out;
@@ -704,7 +704,7 @@ static bool advance_transaction(struct acpi_ec *ec, bool interrupt)
 
 out:
 	if (status & ACPI_EC_FLAG_SCI)
-		ret = acpi_ec_submit_query(ec);
+		ret = acpi_ec_submit_event(ec);
 
 	if (wakeup && interrupt)
 		wake_up(&ec->wait);
@@ -1162,7 +1162,7 @@ static void acpi_ec_event_processor(struct work_struct *work)
 	acpi_ec_delete_query(q);
 }
 
-static int acpi_ec_query(struct acpi_ec *ec)
+static int acpi_ec_submit_query(struct acpi_ec *ec)
 {
 	struct acpi_ec_query *q;
 	u8 value = 0;
@@ -1226,7 +1226,7 @@ static void acpi_ec_event_handler(struct work_struct *work)
 	while (ec->nr_pending_queries) {
 		spin_unlock_irq(&ec->lock);
 
-		acpi_ec_query(ec);
+		acpi_ec_submit_query(ec);
 
 		spin_lock_irq(&ec->lock);
 		ec->nr_pending_queries--;
@@ -1239,7 +1239,7 @@ static void acpi_ec_event_handler(struct work_struct *work)
 	 */
 	if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS ||
 	    ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY)
-		acpi_ec_complete_query(ec);
+		acpi_ec_close_event(ec);
 
 	spin_unlock_irq(&ec->lock);
 
-- 
cgit v1.2.3


From c793570d8725e44b64dbe466eb8ecda34c5eb8ac Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 23 Nov 2021 19:43:05 +0100
Subject: ACPI: EC: Avoid queuing unnecessary work in acpi_ec_submit_event()

Notice that it is not necessary to queue up the event work again
if the while () loop in acpi_ec_event_handler() is still running
which is the case if nr_pending_queries is greater than 0 at the
beginning of acpi_ec_submit_event() and modify the code to avoid
doing that.

While at it, rename nr_pending_queries in struct acpi_ec to
events_to_process which actually matches the role of that field
and change its data type to unsigned int which is sufficient.

No expected functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ec.c       | 17 +++++++++++++----
 drivers/acpi/internal.h |  2 +-
 2 files changed, 14 insertions(+), 5 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 473b1d8617b5..d578f41410ef 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -453,7 +453,16 @@ static bool acpi_ec_submit_event(struct acpi_ec *ec)
 	if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) {
 		ec_dbg_evt("Command(%s) submitted/blocked",
 			   acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY));
-		ec->nr_pending_queries++;
+		/*
+		 * If events_to_process is greqter than 0 at this point, the
+		 * while () loop in acpi_ec_event_handler() is still running
+		 * and incrementing events_to_process will cause it to invoke
+		 * acpi_ec_submit_query() once more, so it is not necessary to
+		 * queue up the event work to start the same loop again.
+		 */
+		if (ec->events_to_process++ > 0)
+			return true;
+
 		ec->events_in_progress++;
 		return queue_work(ec_wq, &ec->work);
 	}
@@ -665,7 +674,7 @@ static bool advance_transaction(struct acpi_ec *ec, bool interrupt)
 	 */
 	if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) {
 		if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT &&
-		    (!ec->nr_pending_queries ||
+		    (!ec->events_to_process ||
 		     test_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags))) {
 			clear_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags);
 			acpi_ec_close_event(ec);
@@ -1223,13 +1232,13 @@ static void acpi_ec_event_handler(struct work_struct *work)
 
 	spin_lock_irq(&ec->lock);
 
-	while (ec->nr_pending_queries) {
+	while (ec->events_to_process) {
 		spin_unlock_irq(&ec->lock);
 
 		acpi_ec_submit_query(ec);
 
 		spin_lock_irq(&ec->lock);
-		ec->nr_pending_queries--;
+		ec->events_to_process--;
 	}
 
 	/*
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 54b2be94d23d..de546be3bc6a 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -182,7 +182,7 @@ struct acpi_ec {
 	spinlock_t lock;
 	struct work_struct work;
 	unsigned long timestamp;
-	unsigned long nr_pending_queries;
+	unsigned int events_to_process;
 	unsigned int events_in_progress;
 	unsigned int queries_in_progress;
 	bool busy_polling;
-- 
cgit v1.2.3


From c33676aa48249b007d55198dc8348cd117e3d8cc Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 23 Nov 2021 19:44:46 +0100
Subject: ACPI: EC: Make the event work state machine visible

The EC driver uses a relatively simple state machine for the event
work handling, but it is not really straightforward to figure out.

The states are as follows:

 "Ready": The event handling work can be submitted.

  In this state, the EC_FLAGS_QUERY_PENDING flag is clear.

 "In progress": The event handling work is pending or is being
                processed.  It cannot be submitted again.

  In ths state, the EC_FLAGS_QUERY_PENDING flag is set and both the
  events_to_process count is nonzero and the EC_FLAGS_QUERY_GUARDING
  flag is clear.

 "Complete": The event handling work has been completed, but it still
             cannot be submitted again.

  In ths state, the EC_FLAGS_QUERY_PENDING flag is set and the
  events_to_process count is zero or the EC_FLAGS_QUERY_GUARDING
  flag is set.

The state changes from "Ready" to "In progress" when new event is
detected by advance_transaction() and acpi_ec_submit_event() is
called by it.

Next, the state can change from "In progress" directly to "Ready" in
the following situations:

 * ec_event_clearing is ACPI_EC_EVT_TIMING_STATUS and the state of
   an ACPI_EC_COMMAND_QUERY transaction becomes ACPI_EC_COMMAND_POLL.

 * ec_event_clearing is ACPI_EC_EVT_TIMING_QUERY and the state of
   an ACPI_EC_COMMAND_QUERY transaction becomes
   ACPI_EC_COMMAND_COMPLETE.

 * ec_event_clearing is either ACPI_EC_EVT_TIMING_STATUS or
   ACPI_EC_EVT_TIMING_QUERY and there are no more events to
   process (ie. ec->events_to_process becomes 0).

If ec_event_clearing is ACPI_EC_EVT_TIMING_EVENT, however, the
state must change from "In progress" to "Complete" before it
can change to "Ready".  The changes from "In progress" to
"Complete" in that case occur in the following situations:

 * The state of an ACPI_EC_COMMAND_QUERY transaction becomes
   ACPI_EC_COMMAND_COMPLETE.

 * There are no more events to process (ie. ec->events_to_process
   becomes 0).

Finally, the state changes from "Complete" to "Ready" when
advance_transaction() is invoked when the state is "Complete" and
the state of the current transaction is not ACPI_EC_COMMAND_POLL.

To make this state machine visible in the code, add a new
event_state field to struct acpi_ec and modify the code to use
it istead the EC_FLAGS_QUERY_PENDING and EC_FLAGS_QUERY_GUARDING
flags.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ec.c       | 75 +++++++++++++++++++++++++++++--------------------
 drivers/acpi/internal.h |  8 ++++++
 2 files changed, 52 insertions(+), 31 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index d578f41410ef..7d7bff4d2100 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -92,8 +92,6 @@ enum ec_command {
 
 enum {
 	EC_FLAGS_QUERY_ENABLED,		/* Query is enabled */
-	EC_FLAGS_QUERY_PENDING,		/* Query is pending */
-	EC_FLAGS_QUERY_GUARDING,	/* Guard for SCI_EVT check */
 	EC_FLAGS_EVENT_HANDLER_INSTALLED,	/* Event handler installed */
 	EC_FLAGS_EC_HANDLER_INSTALLED,	/* OpReg handler installed */
 	EC_FLAGS_QUERY_METHODS_INSTALLED, /* _Qxx handlers installed */
@@ -450,9 +448,11 @@ static bool acpi_ec_submit_event(struct acpi_ec *ec)
 	if (!acpi_ec_event_enabled(ec))
 		return false;
 
-	if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) {
+	if (ec->event_state == EC_EVENT_READY) {
 		ec_dbg_evt("Command(%s) submitted/blocked",
 			   acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY));
+
+		ec->event_state = EC_EVENT_IN_PROGRESS;
 		/*
 		 * If events_to_process is greqter than 0 at this point, the
 		 * while () loop in acpi_ec_event_handler() is still running
@@ -474,11 +474,19 @@ static bool acpi_ec_submit_event(struct acpi_ec *ec)
 	return true;
 }
 
+static void acpi_ec_complete_event(struct acpi_ec *ec)
+{
+	if (ec->event_state == EC_EVENT_IN_PROGRESS)
+		ec->event_state = EC_EVENT_COMPLETE;
+}
+
 static void acpi_ec_close_event(struct acpi_ec *ec)
 {
-	if (test_and_clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
+	if (ec->event_state != EC_EVENT_READY)
 		ec_dbg_evt("Command(%s) unblocked",
 			   acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY));
+
+	ec->event_state = EC_EVENT_READY;
 	acpi_ec_unmask_events(ec);
 }
 
@@ -565,8 +573,8 @@ void acpi_ec_flush_work(void)
 
 static bool acpi_ec_guard_event(struct acpi_ec *ec)
 {
-	bool guarded = true;
 	unsigned long flags;
+	bool guarded;
 
 	spin_lock_irqsave(&ec->lock, flags);
 	/*
@@ -575,19 +583,15 @@ static bool acpi_ec_guard_event(struct acpi_ec *ec)
 	 * evaluating _Qxx, so we need to re-check SCI_EVT after waiting an
 	 * acceptable period.
 	 *
-	 * The guarding period begins when EC_FLAGS_QUERY_PENDING is
-	 * flagged, which means SCI_EVT check has just been performed.
-	 * But if the current transaction is ACPI_EC_COMMAND_QUERY, the
-	 * guarding should have already been performed (via
-	 * EC_FLAGS_QUERY_GUARDING) and should not be applied so that the
-	 * ACPI_EC_COMMAND_QUERY transaction can be transitioned into
-	 * ACPI_EC_COMMAND_POLL state immediately.
+	 * The guarding period is applicable if the event state is not
+	 * EC_EVENT_READY, but otherwise if the current transaction is of the
+	 * ACPI_EC_COMMAND_QUERY type, the guarding should have elapsed already
+	 * and it should not be applied to let the transaction transition into
+	 * the ACPI_EC_COMMAND_POLL state immediately.
 	 */
-	if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS ||
-	    ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY ||
-	    !test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags) ||
-	    (ec->curr && ec->curr->command == ACPI_EC_COMMAND_QUERY))
-		guarded = false;
+	guarded = ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT &&
+		ec->event_state != EC_EVENT_READY &&
+		(!ec->curr || ec->curr->command != ACPI_EC_COMMAND_QUERY);
 	spin_unlock_irqrestore(&ec->lock, flags);
 	return guarded;
 }
@@ -619,16 +623,26 @@ static int ec_transaction_completed(struct acpi_ec *ec)
 static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag)
 {
 	ec->curr->flags |= flag;
-	if (ec->curr->command == ACPI_EC_COMMAND_QUERY) {
-		if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS &&
-		    flag == ACPI_EC_COMMAND_POLL)
+
+	if (ec->curr->command != ACPI_EC_COMMAND_QUERY)
+		return;
+
+	switch (ec_event_clearing) {
+	case ACPI_EC_EVT_TIMING_STATUS:
+		if (flag == ACPI_EC_COMMAND_POLL)
 			acpi_ec_close_event(ec);
-		if (ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY &&
-		    flag == ACPI_EC_COMMAND_COMPLETE)
+
+		return;
+
+	case ACPI_EC_EVT_TIMING_QUERY:
+		if (flag == ACPI_EC_COMMAND_COMPLETE)
 			acpi_ec_close_event(ec);
-		if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT &&
-		    flag == ACPI_EC_COMMAND_COMPLETE)
-			set_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags);
+
+		return;
+
+	case ACPI_EC_EVT_TIMING_EVENT:
+		if (flag == ACPI_EC_COMMAND_COMPLETE)
+			acpi_ec_complete_event(ec);
 	}
 }
 
@@ -674,11 +688,9 @@ static bool advance_transaction(struct acpi_ec *ec, bool interrupt)
 	 */
 	if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) {
 		if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT &&
-		    (!ec->events_to_process ||
-		     test_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags))) {
-			clear_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags);
+		    ec->event_state == EC_EVENT_COMPLETE)
 			acpi_ec_close_event(ec);
-		}
+
 		if (!t)
 			goto out;
 	}
@@ -1246,8 +1258,9 @@ static void acpi_ec_event_handler(struct work_struct *work)
 	 * event handling work again regardless of whether or not the query
 	 * queued up above is processed successfully.
 	 */
-	if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS ||
-	    ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY)
+	if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT)
+		acpi_ec_complete_event(ec);
+	else
 		acpi_ec_close_event(ec);
 
 	spin_unlock_irq(&ec->lock);
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index de546be3bc6a..1db3a2f81763 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -166,6 +166,13 @@ static inline void acpi_early_processor_osc(void) {}
 /* --------------------------------------------------------------------------
                                   Embedded Controller
    -------------------------------------------------------------------------- */
+
+enum acpi_ec_event_state {
+	EC_EVENT_READY = 0,	/* Event work can be submitted */
+	EC_EVENT_IN_PROGRESS,	/* Event work is pending or being processed */
+	EC_EVENT_COMPLETE,	/* Event work processing has completed */
+};
+
 struct acpi_ec {
 	acpi_handle handle;
 	int gpe;
@@ -182,6 +189,7 @@ struct acpi_ec {
 	spinlock_t lock;
 	struct work_struct work;
 	unsigned long timestamp;
+	enum acpi_ec_event_state event_state;
 	unsigned int events_to_process;
 	unsigned int events_in_progress;
 	unsigned int queries_in_progress;
-- 
cgit v1.2.3


From befd9b5b0c621af33a363596c65a8fc0176e2795 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Tue, 23 Nov 2021 19:46:09 +0100
Subject: ACPI: EC: Relocate acpi_ec_create_query() and drop
 acpi_ec_delete_query()

Move acpi_ec_create_query() after acpi_ec_event_processor(), drop the
no longer needed forward declaration of the latter, and eliminate
acpi_ec_delete_query() which isn't really necessary.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ec.c | 54 +++++++++++++++++++++++-------------------------------
 1 file changed, 23 insertions(+), 31 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 7d7bff4d2100..0077d2c85df8 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -170,7 +170,6 @@ struct acpi_ec_query {
 static int acpi_ec_submit_query(struct acpi_ec *ec);
 static bool advance_transaction(struct acpi_ec *ec, bool interrupt);
 static void acpi_ec_event_handler(struct work_struct *work);
-static void acpi_ec_event_processor(struct work_struct *work);
 
 struct acpi_ec *first_ec;
 EXPORT_SYMBOL(first_ec);
@@ -1134,33 +1133,6 @@ void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
 }
 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
 
-static struct acpi_ec_query *acpi_ec_create_query(struct acpi_ec *ec, u8 *pval)
-{
-	struct acpi_ec_query *q;
-	struct transaction *t;
-
-	q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL);
-	if (!q)
-		return NULL;
-
-	INIT_WORK(&q->work, acpi_ec_event_processor);
-	t = &q->transaction;
-	t->command = ACPI_EC_COMMAND_QUERY;
-	t->rdata = pval;
-	t->rlen = 1;
-	q->ec = ec;
-	return q;
-}
-
-static void acpi_ec_delete_query(struct acpi_ec_query *q)
-{
-	if (q) {
-		if (q->handler)
-			acpi_ec_put_query_handler(q->handler);
-		kfree(q);
-	}
-}
-
 static void acpi_ec_event_processor(struct work_struct *work)
 {
 	struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work);
@@ -1180,7 +1152,26 @@ static void acpi_ec_event_processor(struct work_struct *work)
 	ec->queries_in_progress--;
 	spin_unlock_irq(&ec->lock);
 
-	acpi_ec_delete_query(q);
+	acpi_ec_put_query_handler(handler);
+	kfree(q);
+}
+
+static struct acpi_ec_query *acpi_ec_create_query(struct acpi_ec *ec, u8 *pval)
+{
+	struct acpi_ec_query *q;
+	struct transaction *t;
+
+	q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL);
+	if (!q)
+		return NULL;
+
+	INIT_WORK(&q->work, acpi_ec_event_processor);
+	t = &q->transaction;
+	t->command = ACPI_EC_COMMAND_QUERY;
+	t->rdata = pval;
+	t->rlen = 1;
+	q->ec = ec;
+	return q;
 }
 
 static int acpi_ec_submit_query(struct acpi_ec *ec)
@@ -1229,9 +1220,10 @@ static int acpi_ec_submit_query(struct acpi_ec *ec)
 
 	spin_unlock_irq(&ec->lock);
 
+	return 0;
+
 err_exit:
-	if (result)
-		acpi_ec_delete_query(q);
+	kfree(q);
 
 	return result;
 }
-- 
cgit v1.2.3


From b66f86849414807745b5c2129e2de5f27a788c9f Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Thu, 25 Nov 2021 11:36:16 +0100
Subject: ACPI: EC: Mark the ec_sys write_support param as module_param_hw()

Using write_support=1 with the ec_sys module changes the mode of the
"io" debugfs file to 0600. This will cause any attempts to access it under
a kernel in lockdown mode to return -EPERM, which makes the entire ec_sys
module unusable.

Use the special module_param_hw() macro for module parameters which
may not be used while in lockdown mode, to avoid this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ec_sys.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c
index fd39c14493ab..c074a0fae059 100644
--- a/drivers/acpi/ec_sys.c
+++ b/drivers/acpi/ec_sys.c
@@ -19,7 +19,7 @@ MODULE_DESCRIPTION("ACPI EC sysfs access driver");
 MODULE_LICENSE("GPL");
 
 static bool write_support;
-module_param(write_support, bool, 0644);
+module_param_hw(write_support, bool, other, 0644);
 MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may "
 		 "be needed.");
 
-- 
cgit v1.2.3


From e172e650eda3274964df3a74cf12d210eae9a044 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Fri, 26 Nov 2021 16:21:07 +0100
Subject: ACPI: PMIC: constify all struct intel_pmic_opregion_data declarations

The struct intel_pmic_opregion_data declarations never change,
constify them all.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/pmic/intel_pmic.c          | 12 ++++++------
 drivers/acpi/pmic/intel_pmic.h          |  4 +++-
 drivers/acpi/pmic/intel_pmic_bxtwc.c    |  2 +-
 drivers/acpi/pmic/intel_pmic_bytcrc.c   |  2 +-
 drivers/acpi/pmic/intel_pmic_chtcrc.c   |  2 +-
 drivers/acpi/pmic/intel_pmic_chtdc_ti.c |  2 +-
 drivers/acpi/pmic/intel_pmic_chtwc.c    |  2 +-
 drivers/acpi/pmic/intel_pmic_xpower.c   |  2 +-
 8 files changed, 15 insertions(+), 13 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/pmic/intel_pmic.c b/drivers/acpi/pmic/intel_pmic.c
index 9cde299eba88..98bbfd99c709 100644
--- a/drivers/acpi/pmic/intel_pmic.c
+++ b/drivers/acpi/pmic/intel_pmic.c
@@ -25,7 +25,7 @@ struct intel_pmic_opregion {
 	struct mutex lock;
 	struct acpi_lpat_conversion_table *lpat_table;
 	struct regmap *regmap;
-	struct intel_pmic_opregion_data *data;
+	const struct intel_pmic_opregion_data *data;
 	struct intel_pmic_regs_handler_ctx ctx;
 };
 
@@ -53,7 +53,7 @@ static acpi_status intel_pmic_power_handler(u32 function,
 {
 	struct intel_pmic_opregion *opregion = region_context;
 	struct regmap *regmap = opregion->regmap;
-	struct intel_pmic_opregion_data *d = opregion->data;
+	const struct intel_pmic_opregion_data *d = opregion->data;
 	int reg, bit, result;
 
 	if (bits != 32 || !value64)
@@ -135,7 +135,7 @@ static int pmic_thermal_aux(struct intel_pmic_opregion *opregion, int reg,
 static int pmic_thermal_pen(struct intel_pmic_opregion *opregion, int reg,
 			    int bit, u32 function, u64 *value)
 {
-	struct intel_pmic_opregion_data *d = opregion->data;
+	const struct intel_pmic_opregion_data *d = opregion->data;
 	struct regmap *regmap = opregion->regmap;
 
 	if (!d->get_policy || !d->update_policy)
@@ -171,7 +171,7 @@ static acpi_status intel_pmic_thermal_handler(u32 function,
 		void *handler_context, void *region_context)
 {
 	struct intel_pmic_opregion *opregion = region_context;
-	struct intel_pmic_opregion_data *d = opregion->data;
+	const struct intel_pmic_opregion_data *d = opregion->data;
 	int reg, bit, result;
 
 	if (bits != 32 || !value64)
@@ -255,7 +255,7 @@ static acpi_status intel_pmic_regs_handler(u32 function,
 
 int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle,
 					struct regmap *regmap,
-					struct intel_pmic_opregion_data *d)
+					const struct intel_pmic_opregion_data *d)
 {
 	acpi_status status = AE_OK;
 	struct intel_pmic_opregion *opregion;
@@ -344,7 +344,7 @@ EXPORT_SYMBOL_GPL(intel_pmic_install_opregion_handler);
 int intel_soc_pmic_exec_mipi_pmic_seq_element(u16 i2c_address, u32 reg_address,
 					      u32 value, u32 mask)
 {
-	struct intel_pmic_opregion_data *d;
+	const struct intel_pmic_opregion_data *d;
 	int ret;
 
 	if (!intel_pmic_opregion) {
diff --git a/drivers/acpi/pmic/intel_pmic.h b/drivers/acpi/pmic/intel_pmic.h
index 89379476a1df..467a39966dc8 100644
--- a/drivers/acpi/pmic/intel_pmic.h
+++ b/drivers/acpi/pmic/intel_pmic.h
@@ -25,6 +25,8 @@ struct intel_pmic_opregion_data {
 	int pmic_i2c_address;
 };
 
-int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle, struct regmap *regmap, struct intel_pmic_opregion_data *d);
+int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle,
+					struct regmap *regmap,
+					const struct intel_pmic_opregion_data *d);
 
 #endif
diff --git a/drivers/acpi/pmic/intel_pmic_bxtwc.c b/drivers/acpi/pmic/intel_pmic_bxtwc.c
index bd7621edd60b..6620ce0833f6 100644
--- a/drivers/acpi/pmic/intel_pmic_bxtwc.c
+++ b/drivers/acpi/pmic/intel_pmic_bxtwc.c
@@ -369,7 +369,7 @@ intel_bxtwc_pmic_update_policy(struct regmap *regmap,
 	return regmap_update_bits(regmap, reg, mask, val);
 }
 
-static struct intel_pmic_opregion_data intel_bxtwc_pmic_opregion_data = {
+static const struct intel_pmic_opregion_data intel_bxtwc_pmic_opregion_data = {
 	.get_power      = intel_bxtwc_pmic_get_power,
 	.update_power   = intel_bxtwc_pmic_update_power,
 	.get_raw_temp   = intel_bxtwc_pmic_get_raw_temp,
diff --git a/drivers/acpi/pmic/intel_pmic_bytcrc.c b/drivers/acpi/pmic/intel_pmic_bytcrc.c
index 2a692cc4b7ae..8a1d895ed689 100644
--- a/drivers/acpi/pmic/intel_pmic_bytcrc.c
+++ b/drivers/acpi/pmic/intel_pmic_bytcrc.c
@@ -271,7 +271,7 @@ static int intel_crc_pmic_update_policy(struct regmap *regmap,
 	return 0;
 }
 
-static struct intel_pmic_opregion_data intel_crc_pmic_opregion_data = {
+static const struct intel_pmic_opregion_data intel_crc_pmic_opregion_data = {
 	.get_power	= intel_crc_pmic_get_power,
 	.update_power	= intel_crc_pmic_update_power,
 	.get_raw_temp	= intel_crc_pmic_get_raw_temp,
diff --git a/drivers/acpi/pmic/intel_pmic_chtcrc.c b/drivers/acpi/pmic/intel_pmic_chtcrc.c
index 2900dc3074d2..d8266d22cd8e 100644
--- a/drivers/acpi/pmic/intel_pmic_chtcrc.c
+++ b/drivers/acpi/pmic/intel_pmic_chtcrc.c
@@ -23,7 +23,7 @@
  * intel_soc_pmic_exec_mipi_pmic_seq_element work on devices with a
  * CHT Crystal Cove PMIC.
  */
-static struct intel_pmic_opregion_data intel_chtcrc_pmic_opregion_data = {
+static const struct intel_pmic_opregion_data intel_chtcrc_pmic_opregion_data = {
 	.pmic_i2c_address = 0x6e,
 };
 
diff --git a/drivers/acpi/pmic/intel_pmic_chtdc_ti.c b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c
index fef7831d0d63..cb444ddec5a0 100644
--- a/drivers/acpi/pmic/intel_pmic_chtdc_ti.c
+++ b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c
@@ -94,7 +94,7 @@ static int chtdc_ti_pmic_get_raw_temp(struct regmap *regmap, int reg)
 	return ((buf[0] & 0x03) << 8) | buf[1];
 }
 
-static struct intel_pmic_opregion_data chtdc_ti_pmic_opregion_data = {
+static const struct intel_pmic_opregion_data chtdc_ti_pmic_opregion_data = {
 	.get_power = chtdc_ti_pmic_get_power,
 	.update_power = chtdc_ti_pmic_update_power,
 	.get_raw_temp = chtdc_ti_pmic_get_raw_temp,
diff --git a/drivers/acpi/pmic/intel_pmic_chtwc.c b/drivers/acpi/pmic/intel_pmic_chtwc.c
index 7ffd5624b8e1..59385a9a05e5 100644
--- a/drivers/acpi/pmic/intel_pmic_chtwc.c
+++ b/drivers/acpi/pmic/intel_pmic_chtwc.c
@@ -253,7 +253,7 @@ static int intel_cht_wc_exec_mipi_pmic_seq_element(struct regmap *regmap,
  * The thermal table and ops are empty, we do not support the Thermal opregion
  * (DPTF) due to lacking documentation.
  */
-static struct intel_pmic_opregion_data intel_cht_wc_pmic_opregion_data = {
+static const struct intel_pmic_opregion_data intel_cht_wc_pmic_opregion_data = {
 	.get_power		= intel_cht_wc_pmic_get_power,
 	.update_power		= intel_cht_wc_pmic_update_power,
 	.exec_mipi_pmic_seq_element = intel_cht_wc_exec_mipi_pmic_seq_element,
diff --git a/drivers/acpi/pmic/intel_pmic_xpower.c b/drivers/acpi/pmic/intel_pmic_xpower.c
index cbe08e600fa3..b5f4d81c621f 100644
--- a/drivers/acpi/pmic/intel_pmic_xpower.c
+++ b/drivers/acpi/pmic/intel_pmic_xpower.c
@@ -293,7 +293,7 @@ static int intel_xpower_exec_mipi_pmic_seq_element(struct regmap *regmap,
 	return ret;
 }
 
-static struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
+static const struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
 	.get_power = intel_xpower_pmic_get_power,
 	.update_power = intel_xpower_pmic_update_power,
 	.get_raw_temp = intel_xpower_pmic_get_raw_temp,
-- 
cgit v1.2.3


From c5200609c9176482ea96ac73e52bd466b622f385 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Fri, 26 Nov 2021 16:21:08 +0100
Subject: ACPI: PMIC: allow drivers to provide a custom lpat_raw_to_temp()
 function

The LPAT tables used in the DSDT for some PMICs require special handling,
allow the PMIC OpRegion drivers to provide an alternative implementation
by adding a lpat_raw_to_temp function pointer to struct pmic_table;
and initialize this to the default acpi_lpat_raw_to_temp function
for all PMICs.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/pmic/intel_pmic.c          | 2 +-
 drivers/acpi/pmic/intel_pmic.h          | 4 ++++
 drivers/acpi/pmic/intel_pmic_bxtwc.c    | 1 +
 drivers/acpi/pmic/intel_pmic_bytcrc.c   | 1 +
 drivers/acpi/pmic/intel_pmic_chtcrc.c   | 1 +
 drivers/acpi/pmic/intel_pmic_chtdc_ti.c | 1 +
 drivers/acpi/pmic/intel_pmic_chtwc.c    | 1 +
 drivers/acpi/pmic/intel_pmic_xpower.c   | 1 +
 8 files changed, 11 insertions(+), 1 deletion(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/pmic/intel_pmic.c b/drivers/acpi/pmic/intel_pmic.c
index 98bbfd99c709..f20dbda1a831 100644
--- a/drivers/acpi/pmic/intel_pmic.c
+++ b/drivers/acpi/pmic/intel_pmic.c
@@ -95,7 +95,7 @@ static int pmic_read_temp(struct intel_pmic_opregion *opregion,
 		return 0;
 	}
 
-	temp = acpi_lpat_raw_to_temp(opregion->lpat_table, raw_temp);
+	temp = opregion->data->lpat_raw_to_temp(opregion->lpat_table, raw_temp);
 	if (temp < 0)
 		return temp;
 
diff --git a/drivers/acpi/pmic/intel_pmic.h b/drivers/acpi/pmic/intel_pmic.h
index 467a39966dc8..d956b03a6ca0 100644
--- a/drivers/acpi/pmic/intel_pmic.h
+++ b/drivers/acpi/pmic/intel_pmic.h
@@ -2,6 +2,8 @@
 #ifndef __INTEL_PMIC_H
 #define __INTEL_PMIC_H
 
+#include <acpi/acpi_lpat.h>
+
 struct pmic_table {
 	int address;	/* operation region address */
 	int reg;	/* corresponding thermal register */
@@ -17,6 +19,8 @@ struct intel_pmic_opregion_data {
 	int (*update_policy)(struct regmap *r, int reg, int bit, int enable);
 	int (*exec_mipi_pmic_seq_element)(struct regmap *r, u16 i2c_address,
 					  u32 reg_address, u32 value, u32 mask);
+	int (*lpat_raw_to_temp)(struct acpi_lpat_conversion_table *lpat_table,
+				int raw);
 	struct pmic_table *power_table;
 	int power_table_count;
 	struct pmic_table *thermal_table;
diff --git a/drivers/acpi/pmic/intel_pmic_bxtwc.c b/drivers/acpi/pmic/intel_pmic_bxtwc.c
index 6620ce0833f6..e247615189fa 100644
--- a/drivers/acpi/pmic/intel_pmic_bxtwc.c
+++ b/drivers/acpi/pmic/intel_pmic_bxtwc.c
@@ -376,6 +376,7 @@ static const struct intel_pmic_opregion_data intel_bxtwc_pmic_opregion_data = {
 	.update_aux     = intel_bxtwc_pmic_update_aux,
 	.get_policy     = intel_bxtwc_pmic_get_policy,
 	.update_policy  = intel_bxtwc_pmic_update_policy,
+	.lpat_raw_to_temp = acpi_lpat_raw_to_temp,
 	.power_table      = power_table,
 	.power_table_count = ARRAY_SIZE(power_table),
 	.thermal_table     = thermal_table,
diff --git a/drivers/acpi/pmic/intel_pmic_bytcrc.c b/drivers/acpi/pmic/intel_pmic_bytcrc.c
index 8a1d895ed689..9ea79f210965 100644
--- a/drivers/acpi/pmic/intel_pmic_bytcrc.c
+++ b/drivers/acpi/pmic/intel_pmic_bytcrc.c
@@ -278,6 +278,7 @@ static const struct intel_pmic_opregion_data intel_crc_pmic_opregion_data = {
 	.update_aux	= intel_crc_pmic_update_aux,
 	.get_policy	= intel_crc_pmic_get_policy,
 	.update_policy	= intel_crc_pmic_update_policy,
+	.lpat_raw_to_temp = acpi_lpat_raw_to_temp,
 	.power_table	= power_table,
 	.power_table_count= ARRAY_SIZE(power_table),
 	.thermal_table	= thermal_table,
diff --git a/drivers/acpi/pmic/intel_pmic_chtcrc.c b/drivers/acpi/pmic/intel_pmic_chtcrc.c
index d8266d22cd8e..f9301c6f098e 100644
--- a/drivers/acpi/pmic/intel_pmic_chtcrc.c
+++ b/drivers/acpi/pmic/intel_pmic_chtcrc.c
@@ -24,6 +24,7 @@
  * CHT Crystal Cove PMIC.
  */
 static const struct intel_pmic_opregion_data intel_chtcrc_pmic_opregion_data = {
+	.lpat_raw_to_temp = acpi_lpat_raw_to_temp,
 	.pmic_i2c_address = 0x6e,
 };
 
diff --git a/drivers/acpi/pmic/intel_pmic_chtdc_ti.c b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c
index cb444ddec5a0..418eec523025 100644
--- a/drivers/acpi/pmic/intel_pmic_chtdc_ti.c
+++ b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c
@@ -98,6 +98,7 @@ static const struct intel_pmic_opregion_data chtdc_ti_pmic_opregion_data = {
 	.get_power = chtdc_ti_pmic_get_power,
 	.update_power = chtdc_ti_pmic_update_power,
 	.get_raw_temp = chtdc_ti_pmic_get_raw_temp,
+	.lpat_raw_to_temp = acpi_lpat_raw_to_temp,
 	.power_table = chtdc_ti_power_table,
 	.power_table_count = ARRAY_SIZE(chtdc_ti_power_table),
 	.thermal_table = chtdc_ti_thermal_table,
diff --git a/drivers/acpi/pmic/intel_pmic_chtwc.c b/drivers/acpi/pmic/intel_pmic_chtwc.c
index 59385a9a05e5..f2c42f4c79ca 100644
--- a/drivers/acpi/pmic/intel_pmic_chtwc.c
+++ b/drivers/acpi/pmic/intel_pmic_chtwc.c
@@ -257,6 +257,7 @@ static const struct intel_pmic_opregion_data intel_cht_wc_pmic_opregion_data = {
 	.get_power		= intel_cht_wc_pmic_get_power,
 	.update_power		= intel_cht_wc_pmic_update_power,
 	.exec_mipi_pmic_seq_element = intel_cht_wc_exec_mipi_pmic_seq_element,
+	.lpat_raw_to_temp	= acpi_lpat_raw_to_temp,
 	.power_table		= power_table,
 	.power_table_count	= ARRAY_SIZE(power_table),
 };
diff --git a/drivers/acpi/pmic/intel_pmic_xpower.c b/drivers/acpi/pmic/intel_pmic_xpower.c
index b5f4d81c621f..e844bc1f3df5 100644
--- a/drivers/acpi/pmic/intel_pmic_xpower.c
+++ b/drivers/acpi/pmic/intel_pmic_xpower.c
@@ -298,6 +298,7 @@ static const struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
 	.update_power = intel_xpower_pmic_update_power,
 	.get_raw_temp = intel_xpower_pmic_get_raw_temp,
 	.exec_mipi_pmic_seq_element = intel_xpower_exec_mipi_pmic_seq_element,
+	.lpat_raw_to_temp = acpi_lpat_raw_to_temp,
 	.power_table = power_table,
 	.power_table_count = ARRAY_SIZE(power_table),
 	.thermal_table = thermal_table,
-- 
cgit v1.2.3


From 5f96ba56552121f4297874d0accf29b9b4a1ae93 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Fri, 26 Nov 2021 16:21:09 +0100
Subject: ACPI: PMIC: xpower: Fix _TMP ACPI errors
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

On some devices with a X-Powers AXP288 PMIC the LPAT tables in the ACPI
node for the AXP288 PMIC for some reason only describe a small temperature
range, e.g. 27° - 37° Celcius (assuming the entries are in millidegrees).

When the tablet is idle in a room at 21° degrees this is causing values
outside the LPAT table to be read, causing e.g. the following 2 errors
to get spammed to the logs every 4 seconds! :

[ 7512.791316] ACPI Error: AE_ERROR, Returned by Handler for [UserDefinedRegion] (20210930/evregion-281)
[ 7512.791611] ACPI Error: Aborting method \_SB.SXP1._TMP due to previous error (AE_ERROR) (20210930/psparse-529)

Fix this by clamping the raw value to the LPAT table range before
passing it to acpi_lpat_raw_to_temp().

Note clamping has been chosen rather then extrapolating because it is
unknown how other parts of the ACPI tables will respond to temperature
values outside of the LPAT range.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/pmic/intel_pmic_xpower.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/pmic/intel_pmic_xpower.c b/drivers/acpi/pmic/intel_pmic_xpower.c
index e844bc1f3df5..61bbe4c24d87 100644
--- a/drivers/acpi/pmic/intel_pmic_xpower.c
+++ b/drivers/acpi/pmic/intel_pmic_xpower.c
@@ -293,12 +293,33 @@ static int intel_xpower_exec_mipi_pmic_seq_element(struct regmap *regmap,
 	return ret;
 }
 
+static int intel_xpower_lpat_raw_to_temp(struct acpi_lpat_conversion_table *lpat_table,
+					 int raw)
+{
+	struct acpi_lpat first = lpat_table->lpat[0];
+	struct acpi_lpat last = lpat_table->lpat[lpat_table->lpat_count - 1];
+
+	/*
+	 * Some LPAT tables in the ACPI Device for the AXP288 PMIC for some
+	 * reason only describe a small temperature range, e.g. 27° - 37°
+	 * Celcius. Resulting in errors when the tablet is idle in a cool room.
+	 *
+	 * To avoid these errors clamp the raw value to be inside the LPAT.
+	 */
+	if (first.raw < last.raw)
+		raw = clamp(raw, first.raw, last.raw);
+	else
+		raw = clamp(raw, last.raw, first.raw);
+
+	return acpi_lpat_raw_to_temp(lpat_table, raw);
+}
+
 static const struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
 	.get_power = intel_xpower_pmic_get_power,
 	.update_power = intel_xpower_pmic_update_power,
 	.get_raw_temp = intel_xpower_pmic_get_raw_temp,
 	.exec_mipi_pmic_seq_element = intel_xpower_exec_mipi_pmic_seq_element,
-	.lpat_raw_to_temp = acpi_lpat_raw_to_temp,
+	.lpat_raw_to_temp = intel_xpower_lpat_raw_to_temp,
 	.power_table = power_table,
 	.power_table_count = ARRAY_SIZE(power_table),
 	.thermal_table = thermal_table,
-- 
cgit v1.2.3


From 53d01e2016d77ff647fb2056c39c67df18ee86bf Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Date: Mon, 6 Dec 2021 15:29:52 +0300
Subject: ACPI: PM: Avoid CPU cache flush when entering S4

According to ACPI 6.4, Section 16.2, the CPU cache flushing is
required on entering to S1, S2, and S3.

No need to flush the caches during hibernation (S4).

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/sleep.c | 2 --
 1 file changed, 2 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index eaa47753b758..5bcf82fcb5f3 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -903,8 +903,6 @@ static int acpi_hibernation_enter(void)
 {
 	acpi_status status = AE_OK;
 
-	ACPI_FLUSH_CPU_CACHE();
-
 	/* This shouldn't return.  If it returns, we have a problem */
 	status = acpi_enter_sleep_state(ACPI_STATE_S4);
 	/* Reprogram control registers */
-- 
cgit v1.2.3


From 7e29a225c7508f858ac1c900675390ec4ef01aed Mon Sep 17 00:00:00 2001
From: Shuuichirou Ishii <ishii.shuuichir@fujitsu.com>
Date: Mon, 29 Nov 2021 15:10:44 +0900
Subject: ACPI: tables: Add AEST to the list of known table signatures

Add AEST to the list of known ACPI table signatures to allow the
kernel to recognize it when upgrading tables via initrd.

Signed-off-by: Shuuichirou Ishii <ishii.shuuichir@fujitsu.com>
Acked-by: Hanjun Guo <guohanjun@huawei.com>
[ rjw: New subject and changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/tables.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 71419eb16e09..2699bf7e21ab 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -500,7 +500,7 @@ static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
 	ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
 	ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
 	ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
-	ACPI_SIG_NHLT };
+	ACPI_SIG_NHLT, ACPI_SIG_AEST };
 
 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
 
-- 
cgit v1.2.3


From e3c963c498871e0d4b2eceb32e2b989493838ccc Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Fri, 3 Dec 2021 17:36:20 +0100
Subject: ACPI: scan: Introduce acpi_fetch_acpi_dev()

Introduce acpi_fetch_acpi_dev() as a more reasonable replacement for
acpi_bus_get_device() and modify the code in scan.c to use it instead
of the latter.

No expected functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/acpi/scan.c     | 34 ++++++++++++++++++++++++----------
 include/acpi/acpi_bus.h |  1 +
 2 files changed, 25 insertions(+), 10 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 5991dddbc9ce..a9adcda39d40 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -135,12 +135,12 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 				    void **ret_p)
 {
-	struct acpi_device *device = NULL;
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 	struct acpi_device_physical_node *pn;
 	bool second_pass = (bool)data;
 	acpi_status status = AE_OK;
 
-	if (acpi_bus_get_device(handle, &device))
+	if (!device)
 		return AE_OK;
 
 	if (device->handler && !device->handler->hotplug.enabled) {
@@ -180,10 +180,10 @@ static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
 				   void **ret_p)
 {
-	struct acpi_device *device = NULL;
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 	struct acpi_device_physical_node *pn;
 
-	if (acpi_bus_get_device(handle, &device))
+	if (!device)
 		return AE_OK;
 
 	mutex_lock(&device->physical_node_lock);
@@ -599,6 +599,19 @@ int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 }
 EXPORT_SYMBOL(acpi_bus_get_device);
 
+/**
+ * acpi_fetch_acpi_dev - Retrieve ACPI device object.
+ * @handle: ACPI handle associated with the requested ACPI device object.
+ *
+ * Return a pointer to the ACPI device object associated with @handle, if
+ * present, or NULL otherwise.
+ */
+struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
+{
+	return handle_to_device(handle, NULL);
+}
+EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
+
 static void get_acpi_device(void *dev)
 {
 	acpi_dev_get(dev);
@@ -799,7 +812,7 @@ static const char * const acpi_ignore_dep_ids[] = {
 
 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 {
-	struct acpi_device *device = NULL;
+	struct acpi_device *device;
 	acpi_status status;
 
 	/*
@@ -814,7 +827,9 @@ static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 		status = acpi_get_parent(handle, &handle);
 		if (ACPI_FAILURE(status))
 			return status == AE_NULL_ENTRY ? NULL : acpi_root;
-	} while (acpi_bus_get_device(handle, &device));
+
+		device = acpi_fetch_acpi_dev(handle);
+	} while (!device);
 	return device;
 }
 
@@ -2003,11 +2018,10 @@ static bool acpi_bus_scan_second_pass;
 static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
 				      struct acpi_device **adev_p)
 {
-	struct acpi_device *device = NULL;
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 	acpi_object_type acpi_type;
 	int type;
 
-	acpi_bus_get_device(handle, &device);
 	if (device)
 		goto out;
 
@@ -2548,8 +2562,8 @@ int __init acpi_scan_init(void)
 	if (result)
 		goto out;
 
-	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
-	if (result)
+	acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
+	if (!acpi_root)
 		goto out;
 
 	/* Fixed feature devices do not exist on HW-reduced platform */
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 480f9207a4c6..17f700c9a4f9 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -505,6 +505,7 @@ extern int unregister_acpi_notifier(struct notifier_block *);
  */
 
 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device);
+struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle);
 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 				       unsigned long long *sta);
 int acpi_bus_get_status(struct acpi_device *device);
-- 
cgit v1.2.3


From 99ece713773bfa17fdb4ee2a1fb3b7bee82e4b1a Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Fri, 3 Dec 2021 17:37:10 +0100
Subject: ACPI: Use acpi_fetch_acpi_dev() instead of acpi_bus_get_device()

Modify the ACPI code to use acpi_fetch_acpi_dev() instead of
acpi_bus_get_device() where applicable.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/acpi/acpi_video.c       |  5 ++---
 drivers/acpi/device_pm.c        | 31 +++++++++++++------------------
 drivers/acpi/dock.c             |  3 +--
 drivers/acpi/pci_link.c         | 12 ++++--------
 drivers/acpi/pci_root.c         | 10 ++++------
 drivers/acpi/power.c            |  7 +++----
 drivers/acpi/processor_driver.c | 10 +++++++---
 drivers/acpi/processor_idle.c   |  2 +-
 drivers/acpi/property.c         | 11 +++++------
 drivers/acpi/resource.c         |  4 ++--
 drivers/acpi/thermal.c          |  9 ++++-----
 drivers/acpi/video_detect.c     |  6 ++----
 drivers/acpi/x86/s2idle.c       |  4 ++--
 13 files changed, 50 insertions(+), 64 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 42ede059728c..990ff5b0aeb8 100644
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -1733,13 +1733,12 @@ acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
 {
 	struct acpi_device *device = context;
 	struct acpi_device *sibling;
-	int result;
 
 	if (handle == device->handle)
 		return AE_CTRL_TERMINATE;
 
-	result = acpi_bus_get_device(handle, &sibling);
-	if (result)
+	sibling = acpi_fetch_acpi_dev(handle);
+	if (!sibling)
 		return AE_OK;
 
 	if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index 19b33c028f35..cc6c97e7dcae 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -285,14 +285,12 @@ EXPORT_SYMBOL(acpi_device_set_power);
 
 int acpi_bus_set_power(acpi_handle handle, int state)
 {
-	struct acpi_device *device;
-	int result;
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 
-	result = acpi_bus_get_device(handle, &device);
-	if (result)
-		return result;
+	if (device)
+		return acpi_device_set_power(device, state);
 
-	return acpi_device_set_power(device, state);
+	return -ENODEV;
 }
 EXPORT_SYMBOL(acpi_bus_set_power);
 
@@ -410,21 +408,20 @@ EXPORT_SYMBOL_GPL(acpi_device_update_power);
 
 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 {
-	struct acpi_device *device;
-	int result;
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 
-	result = acpi_bus_get_device(handle, &device);
-	return result ? result : acpi_device_update_power(device, state_p);
+	if (device)
+		return acpi_device_update_power(device, state_p);
+
+	return -ENODEV;
 }
 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 
 bool acpi_bus_power_manageable(acpi_handle handle)
 {
-	struct acpi_device *device;
-	int result;
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 
-	result = acpi_bus_get_device(handle, &device);
-	return result ? false : device->flags.power_manageable;
+	return device && device->flags.power_manageable;
 }
 EXPORT_SYMBOL(acpi_bus_power_manageable);
 
@@ -543,11 +540,9 @@ acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
 
 bool acpi_bus_can_wakeup(acpi_handle handle)
 {
-	struct acpi_device *device;
-	int result;
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 
-	result = acpi_bus_get_device(handle, &device);
-	return result ? false : device->wakeup.flags.valid;
+	return device && device->wakeup.flags.valid;
 }
 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index c8e9b962e18c..a89bdbe00184 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -489,9 +489,8 @@ static ssize_t docked_show(struct device *dev,
 			   struct device_attribute *attr, char *buf)
 {
 	struct dock_station *dock_station = dev->platform_data;
-	struct acpi_device *adev = NULL;
+	struct acpi_device *adev = acpi_fetch_acpi_dev(dock_station->handle);
 
-	acpi_bus_get_device(dock_station->handle, &adev);
 	return sysfs_emit(buf, "%u\n", acpi_device_enumerated(adev));
 }
 static DEVICE_ATTR_RO(docked);
diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
index cb7b900d9466..d54fb8e54671 100644
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -606,12 +606,10 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
 int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
 			       int *polarity, char **name)
 {
-	int result;
-	struct acpi_device *device;
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 	struct acpi_pci_link *link;
 
-	result = acpi_bus_get_device(handle, &device);
-	if (result) {
+	if (!device) {
 		acpi_handle_err(handle, "Invalid link device\n");
 		return -1;
 	}
@@ -658,12 +656,10 @@ int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
  */
 int acpi_pci_link_free_irq(acpi_handle handle)
 {
-	struct acpi_device *device;
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 	struct acpi_pci_link *link;
-	acpi_status result;
 
-	result = acpi_bus_get_device(handle, &device);
-	if (result) {
+	if (!device) {
 		acpi_handle_err(handle, "Invalid link device\n");
 		return -1;
 	}
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ab2f7dfb0c44..41a8fef06534 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -67,11 +67,10 @@ static struct acpi_scan_handler pci_root_handler = {
  */
 int acpi_is_root_bridge(acpi_handle handle)
 {
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 	int ret;
-	struct acpi_device *device;
 
-	ret = acpi_bus_get_device(handle, &device);
-	if (ret)
+	if (!device)
 		return 0;
 
 	ret = acpi_match_device_ids(device, root_device_ids);
@@ -215,11 +214,10 @@ static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
 
 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
 {
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 	struct acpi_pci_root *root;
-	struct acpi_device *device;
 
-	if (acpi_bus_get_device(handle, &device) ||
-	    acpi_match_device_ids(device, root_device_ids))
+	if (!device || acpi_match_device_ids(device, root_device_ids))
 		return NULL;
 
 	root = acpi_driver_data(device);
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 5dcb02ededbc..7e50bbfff1e0 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -81,9 +81,9 @@ struct acpi_power_resource *to_power_resource(struct acpi_device *device)
 
 static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle)
 {
-	struct acpi_device *device;
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 
-	if (acpi_bus_get_device(handle, &device))
+	if (!device)
 		return NULL;
 
 	return to_power_resource(device);
@@ -916,15 +916,14 @@ static void acpi_power_add_resource_to_list(struct acpi_power_resource *resource
 
 struct acpi_device *acpi_add_power_resource(acpi_handle handle)
 {
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
 	struct acpi_power_resource *resource;
-	struct acpi_device *device = NULL;
 	union acpi_object acpi_object;
 	struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
 	acpi_status status;
 	u8 state_dummy;
 	int result;
 
-	acpi_bus_get_device(handle, &device);
 	if (device)
 		return device;
 
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 77541f939be3..368a9edefd0c 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -98,8 +98,13 @@ static int acpi_soft_cpu_online(unsigned int cpu)
 	struct acpi_processor *pr = per_cpu(processors, cpu);
 	struct acpi_device *device;
 
-	if (!pr || acpi_bus_get_device(pr->handle, &device))
+	if (!pr)
+		return 0;
+
+	device = acpi_fetch_acpi_dev(pr->handle);
+	if (!device)
 		return 0;
+
 	/*
 	 * CPU got physically hotplugged and onlined for the first time:
 	 * Initialize missing things.
@@ -125,9 +130,8 @@ static int acpi_soft_cpu_online(unsigned int cpu)
 static int acpi_soft_cpu_dead(unsigned int cpu)
 {
 	struct acpi_processor *pr = per_cpu(processors, cpu);
-	struct acpi_device *device;
 
-	if (!pr || acpi_bus_get_device(pr->handle, &device))
+	if (!pr || !acpi_fetch_acpi_dev(pr->handle))
 		return 0;
 
 	acpi_processor_reevaluate_tstate(pr, true);
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 76ef1bcc8848..ef17b95e5f37 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1101,7 +1101,7 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
 
 	status = acpi_get_parent(handle, &pr_ahandle);
 	while (ACPI_SUCCESS(status)) {
-		acpi_bus_get_device(pr_ahandle, &d);
+		d = acpi_fetch_acpi_dev(pr_ahandle);
 		handle = pr_ahandle;
 
 		if (strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID))
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index e312ebaed8db..86987f903eb1 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -687,9 +687,9 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
 		if (index)
 			return -EINVAL;
 
-		ret = acpi_bus_get_device(obj->reference.handle, &device);
-		if (ret)
-			return ret == -ENODEV ? -EINVAL : ret;
+		device = acpi_fetch_acpi_dev(obj->reference.handle);
+		if (!device)
+			return -EINVAL;
 
 		args->fwnode = acpi_fwnode_handle(device);
 		args->nargs = 0;
@@ -719,9 +719,8 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
 		if (element->type == ACPI_TYPE_LOCAL_REFERENCE) {
 			struct fwnode_handle *ref_fwnode;
 
-			ret = acpi_bus_get_device(element->reference.handle,
-						  &device);
-			if (ret)
+			device = acpi_fetch_acpi_dev(element->reference.handle);
+			if (!device)
 				return -EINVAL;
 
 			nargs = 0;
diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 3c25ce8c95ba..c2d494784425 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -791,9 +791,9 @@ static acpi_status acpi_res_consumer_cb(acpi_handle handle, u32 depth,
 {
 	struct resource *res = context;
 	struct acpi_device **consumer = (struct acpi_device **) ret;
-	struct acpi_device *adev;
+	struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
 
-	if (acpi_bus_get_device(handle, &adev))
+	if (!adev)
 		return AE_OK;
 
 	if (acpi_dev_consumes_res(adev, res)) {
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 95105db642b9..75cda1315235 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -697,7 +697,6 @@ static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 	struct acpi_device *device = cdev->devdata;
 	struct acpi_thermal *tz = thermal->devdata;
 	struct acpi_device *dev;
-	acpi_status status;
 	acpi_handle handle;
 	int i;
 	int j;
@@ -715,8 +714,8 @@ static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 		for (i = 0; i < tz->trips.passive.devices.count;
 		    i++) {
 			handle = tz->trips.passive.devices.handles[i];
-			status = acpi_bus_get_device(handle, &dev);
-			if (ACPI_FAILURE(status) || dev != device)
+			dev = acpi_fetch_acpi_dev(handle);
+			if (dev != device)
 				continue;
 			if (bind)
 				result =
@@ -741,8 +740,8 @@ static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 		    j < tz->trips.active[i].devices.count;
 		    j++) {
 			handle = tz->trips.active[i].devices.handles[j];
-			status = acpi_bus_get_device(handle, &dev);
-			if (ACPI_FAILURE(status) || dev != device)
+			dev = acpi_fetch_acpi_dev(handle);
+			if (dev != device)
 				continue;
 			if (bind)
 				result = thermal_zone_bind_cooling_device
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 068e393ea0c6..4f64713e9917 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -59,18 +59,16 @@ static void acpi_video_parse_cmdline(void)
 static acpi_status
 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
+	struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
 	long *cap = context;
 	struct pci_dev *dev;
-	struct acpi_device *acpi_dev;
 
 	static const struct acpi_device_id video_ids[] = {
 		{ACPI_VIDEO_HID, 0},
 		{"", 0},
 	};
-	if (acpi_bus_get_device(handle, &acpi_dev))
-		return AE_OK;
 
-	if (!acpi_match_device_ids(acpi_dev, video_ids)) {
+	if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
 		dev = acpi_get_pci_dev(handle);
 		if (!dev)
 			return AE_OK;
diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c
index 1c48358b43ba..abc06e7f89d8 100644
--- a/drivers/acpi/x86/s2idle.c
+++ b/drivers/acpi/x86/s2idle.c
@@ -293,9 +293,9 @@ static void lpi_check_constraints(void)
 
 	for (i = 0; i < lpi_constraints_table_size; ++i) {
 		acpi_handle handle = lpi_constraints_table[i].handle;
-		struct acpi_device *adev;
+		struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
 
-		if (!handle || acpi_bus_get_device(handle, &adev))
+		if (!adev)
 			continue;
 
 		acpi_handle_debug(handle,
-- 
cgit v1.2.3


From 87ebbb8c612b1214f227ebb8f25442c6d163e802 Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Date: Mon, 6 Dec 2021 15:29:51 +0300
Subject: ACPI: processor: idle: Only flush cache on entering C3

According to ACPI 6.4, Section 8.2, CPU cache flushing required on
entering the C3 power state.

Avoid flushing the cache on entering other C-states.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/processor_idle.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 4b906bb527e8..d94794bc269e 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -565,7 +565,8 @@ static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
 {
 	struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
 
-	ACPI_FLUSH_CPU_CACHE();
+	if (cx->type == ACPI_STATE_C3)
+		ACPI_FLUSH_CPU_CACHE();
 
 	while (1) {
 
-- 
cgit v1.2.3


From 3c89857a66ef15bcf54c8fd255a1fd70dbc823a6 Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Date: Thu, 9 Dec 2021 16:08:02 +0300
Subject: ACPI: PM: Remove redundant cache flushing

ACPICA code takes care about cache flushing on S1/S2/S3 in
acpi_hw_extended_sleep() and acpi_hw_legacy_sleep().

acpi_suspend_enter() calls into ACPICA code via acpi_enter_sleep_state()
for S1 or x86_acpi_suspend_lowlevel() for S3.

acpi_sleep_prepare() call tree:
  __acpi_pm_prepare()
    acpi_pm_prepare()
      acpi_suspend_ops::prepare_late()
      acpi_hibernation_ops::pre_snapshot()
      acpi_hibernation_ops::prepare()
    acpi_suspend_begin_old()
      acpi_suspend_begin_old::begin()
  acpi_hibernation_begin_old()
    acpi_hibernation_ops_old::acpi_hibernation_begin_old()
  acpi_power_off_prepare()
    pm_power_off_prepare()

Hibernation (S4) and Power Off (S5) don't require cache flushing, so
the only interesting callsites are acpi_suspend_ops::prepare_late()
and acpi_suspend_begin_old::begin(). Both of them have cache flush
on ->enter() operation in acpi_suspend_enter().

Remove redundant ACPI_FLUSH_CPU_CACHE() in acpi_sleep_prepare() and
acpi_suspend_enter().

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/sleep.c | 3 ---
 1 file changed, 3 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 5bcf82fcb5f3..4b8454f26ca1 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -73,7 +73,6 @@ static int acpi_sleep_prepare(u32 acpi_state)
 		acpi_set_waking_vector(acpi_wakeup_address);
 
 	}
-	ACPI_FLUSH_CPU_CACHE();
 #endif
 	pr_info("Preparing to enter system sleep state S%d\n", acpi_state);
 	acpi_enable_wakeup_devices(acpi_state);
@@ -566,8 +565,6 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
 	u32 acpi_state = acpi_target_sleep_state;
 	int error;
 
-	ACPI_FLUSH_CPU_CACHE();
-
 	trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
 	switch (acpi_state) {
 	case ACPI_STATE_S1:
-- 
cgit v1.2.3


From bcf6f1759adff0ec3f73ab7b4a873405ee26ff5c Mon Sep 17 00:00:00 2001
From: Vitaly Kuznetsov <vkuznets@redhat.com>
Date: Thu, 16 Dec 2021 10:58:26 +0100
Subject: ACPI: NUMA: Process hotpluggable memblocks when
 !CONFIG_MEMORY_HOTPLUG

Some systems (e.g. Hyper-V guests) have all their memory marked as
hotpluggable in SRAT. acpi_numa_memory_affinity_init(), however,
ignores all such regions when !CONFIG_MEMORY_HOTPLUG and this is
unfortunate as memory affinity (NUMA) information gets lost.

'Hot Pluggable' flag in SRAT only means that "system hardware supports
hot-add and hot-remove of this memory region", it doesn't prevent
memory from being cold-plugged there.

Ignore 'Hot Pluggable' bit instead of skipping the whole memory
affinity information when !CONFIG_MEMORY_HOTPLUG.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/numa/srat.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c
index b8795fc49097..6c884f3e8332 100644
--- a/drivers/acpi/numa/srat.c
+++ b/drivers/acpi/numa/srat.c
@@ -254,9 +254,8 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 	}
 	if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
 		goto out_err;
-	hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
-	if (hotpluggable && !IS_ENABLED(CONFIG_MEMORY_HOTPLUG))
-		goto out_err;
+	hotpluggable = IS_ENABLED(CONFIG_MEMORY_HOTPLUG) &&
+		(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE);
 
 	start = ma->base_address;
 	end = start + ma->length;
-- 
cgit v1.2.3


From 1a901c914dfbee04f20200a116dc9d30679c8cc6 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Wed, 22 Dec 2021 16:04:45 +0200
Subject: ACPI: CPPC: Amend documentation in the comments

Currently it's too hard to read the _CPC structure as it's commented.
Reshuffle indentation and style to make it readable.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/cppc_acpi.c | 59 +++++++++++++++++-------------------------------
 1 file changed, 21 insertions(+), 38 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index b62c87b8ce4a..182471f319fe 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -604,47 +604,30 @@ static bool is_cppc_supported(int revision, int num_ent)
 /*
  * An example CPC table looks like the following.
  *
- *	Name(_CPC, Package()
- *			{
- *			17,
- *			NumEntries
- *			1,
- *			// Revision
- *			ResourceTemplate(){Register(PCC, 32, 0, 0x120, 2)},
- *			// Highest Performance
- *			ResourceTemplate(){Register(PCC, 32, 0, 0x124, 2)},
- *			// Nominal Performance
- *			ResourceTemplate(){Register(PCC, 32, 0, 0x128, 2)},
- *			// Lowest Nonlinear Performance
- *			ResourceTemplate(){Register(PCC, 32, 0, 0x12C, 2)},
- *			// Lowest Performance
- *			ResourceTemplate(){Register(PCC, 32, 0, 0x130, 2)},
- *			// Guaranteed Performance Register
- *			ResourceTemplate(){Register(PCC, 32, 0, 0x110, 2)},
- *			// Desired Performance Register
- *			ResourceTemplate(){Register(SystemMemory, 0, 0, 0, 0)},
- *			..
- *			..
- *			..
- *
- *		}
+ *  Name (_CPC, Package() {
+ *      17,							// NumEntries
+ *      1,							// Revision
+ *      ResourceTemplate() {Register(PCC, 32, 0, 0x120, 2)},	// Highest Performance
+ *      ResourceTemplate() {Register(PCC, 32, 0, 0x124, 2)},	// Nominal Performance
+ *      ResourceTemplate() {Register(PCC, 32, 0, 0x128, 2)},	// Lowest Nonlinear Performance
+ *      ResourceTemplate() {Register(PCC, 32, 0, 0x12C, 2)},	// Lowest Performance
+ *      ResourceTemplate() {Register(PCC, 32, 0, 0x130, 2)},	// Guaranteed Performance Register
+ *      ResourceTemplate() {Register(PCC, 32, 0, 0x110, 2)},	// Desired Performance Register
+ *      ResourceTemplate() {Register(SystemMemory, 0, 0, 0, 0)},
+ *      ...
+ *      ...
+ *      ...
+ *  }
  * Each Register() encodes how to access that specific register.
  * e.g. a sample PCC entry has the following encoding:
  *
- *	Register (
- *		PCC,
- *		AddressSpaceKeyword
- *		8,
- *		//RegisterBitWidth
- *		8,
- *		//RegisterBitOffset
- *		0x30,
- *		//RegisterAddress
- *		9
- *		//AccessSize (subspace ID)
- *		0
- *		)
- *	}
+ *  Register (
+ *      PCC,	// AddressSpaceKeyword
+ *      8,	// RegisterBitWidth
+ *      8,	// RegisterBitOffset
+ *      0x30,	// RegisterAddress
+ *      9,	// AccessSize (subspace ID)
+ *  )
  */
 
 #ifndef init_freq_invariance_cppc
-- 
cgit v1.2.3


From ca25f92b72d25457653dbf2a81f322235804fb05 Mon Sep 17 00:00:00 2001
From: Jessica Clarke <jrtc27@jrtc27.com>
Date: Wed, 22 Dec 2021 17:21:25 +0100
Subject: ACPICA: Use original data_table_region pointer for accesses

ACPICA commit d9eb82bd7515989f0b29d79deeeb758db4d6529c

Currently the pointer to the table is cast to acpi_physical_address and
later cast back to a pointer to be dereferenced. Whether or not this is
supported is implementation-defined.

On CHERI, and thus Arm's experimental Morello prototype architecture,
pointers are represented as capabilities, which are unforgeable bounded
pointers, providing always-on fine-grained spatial memory safety. This
means that any pointer cast to a plain integer will lose all its
associated metadata, and when cast back to a pointer it will give a
null-derived pointer (one that has the same metadata as null but an
address equal to the integer) that will trap on any dereference. As a
result, this is an implementation where acpi_physical_address cannot be
used as a hack to store real pointers.

Thus, add a new field to struct acpi_object_region to store the pointer for
table regions, and propagate it to acpi_ex_data_table_space_handler via the
region context, to use a more portable implementation that supports
CHERI.

Link: https://github.com/acpica/acpica/commit/d9eb82bd
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpica/acevents.h  |  5 ++++
 drivers/acpi/acpica/acobject.h  |  1 +
 drivers/acpi/acpica/dsopcode.c  |  1 +
 drivers/acpi/acpica/evhandler.c |  2 +-
 drivers/acpi/acpica/evrgnini.c  | 52 +++++++++++++++++++++++++++++++++++++++++
 drivers/acpi/acpica/excreate.c  |  1 +
 drivers/acpi/acpica/exregion.c  | 15 ++++++++----
 include/acpi/actypes.h          |  4 ++++
 8 files changed, 76 insertions(+), 5 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/acpica/acevents.h b/drivers/acpi/acpica/acevents.h
index 82a75964343b..b29ba436944a 100644
--- a/drivers/acpi/acpica/acevents.h
+++ b/drivers/acpi/acpica/acevents.h
@@ -223,6 +223,11 @@ acpi_ev_pci_bar_region_setup(acpi_handle handle,
 			     u32 function,
 			     void *handler_context, void **region_context);
 
+acpi_status
+acpi_ev_data_table_region_setup(acpi_handle handle,
+				u32 function,
+				void *handler_context, void **region_context);
+
 acpi_status
 acpi_ev_default_region_setup(acpi_handle handle,
 			     u32 function,
diff --git a/drivers/acpi/acpica/acobject.h b/drivers/acpi/acpica/acobject.h
index 9db5ae0f79ea..0aa0d847cb25 100644
--- a/drivers/acpi/acpica/acobject.h
+++ b/drivers/acpi/acpica/acobject.h
@@ -138,6 +138,7 @@ struct acpi_object_region {
 	union acpi_operand_object *next;
 	acpi_physical_address address;
 	u32 length;
+	void *pointer;		/* Only for data table regions */
 };
 
 struct acpi_object_method {
diff --git a/drivers/acpi/acpica/dsopcode.c b/drivers/acpi/acpica/dsopcode.c
index 639635291ab7..44c448269861 100644
--- a/drivers/acpi/acpica/dsopcode.c
+++ b/drivers/acpi/acpica/dsopcode.c
@@ -531,6 +531,7 @@ acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
 
 	obj_desc->region.address = ACPI_PTR_TO_PHYSADDR(table);
 	obj_desc->region.length = table->length;
+	obj_desc->region.pointer = table;
 
 	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
 			  obj_desc,
diff --git a/drivers/acpi/acpica/evhandler.c b/drivers/acpi/acpica/evhandler.c
index c0cd7147a5a3..8f43d38dc4ca 100644
--- a/drivers/acpi/acpica/evhandler.c
+++ b/drivers/acpi/acpica/evhandler.c
@@ -386,7 +386,7 @@ acpi_ev_install_space_handler(struct acpi_namespace_node *node,
 		case ACPI_ADR_SPACE_DATA_TABLE:
 
 			handler = acpi_ex_data_table_space_handler;
-			setup = NULL;
+			setup = acpi_ev_data_table_region_setup;
 			break;
 
 		default:
diff --git a/drivers/acpi/acpica/evrgnini.c b/drivers/acpi/acpica/evrgnini.c
index 984c172453bf..d28dee929e61 100644
--- a/drivers/acpi/acpica/evrgnini.c
+++ b/drivers/acpi/acpica/evrgnini.c
@@ -406,6 +406,58 @@ acpi_ev_cmos_region_setup(acpi_handle handle,
 	return_ACPI_STATUS(AE_OK);
 }
 
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_data_table_region_setup
+ *
+ * PARAMETERS:  handle              - Region we are interested in
+ *              function            - Start or stop
+ *              handler_context     - Address space handler context
+ *              region_context      - Region specific context
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Setup a data_table_region
+ *
+ * MUTEX:       Assumes namespace is not locked
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ev_data_table_region_setup(acpi_handle handle,
+				u32 function,
+				void *handler_context, void **region_context)
+{
+	union acpi_operand_object *region_desc =
+	    (union acpi_operand_object *)handle;
+	struct acpi_data_table_space_context *local_region_context;
+
+	ACPI_FUNCTION_TRACE(ev_data_table_region_setup);
+
+	if (function == ACPI_REGION_DEACTIVATE) {
+		if (*region_context) {
+			ACPI_FREE(*region_context);
+			*region_context = NULL;
+		}
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/* Create a new context */
+
+	local_region_context =
+	    ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_data_table_space_context));
+	if (!(local_region_context)) {
+		return_ACPI_STATUS(AE_NO_MEMORY);
+	}
+
+	/* Save the data table pointer for use in the handler */
+
+	local_region_context->pointer = region_desc->region.pointer;
+
+	*region_context = local_region_context;
+	return_ACPI_STATUS(AE_OK);
+}
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_default_region_setup
diff --git a/drivers/acpi/acpica/excreate.c b/drivers/acpi/acpica/excreate.c
index 80b52ad55775..deb3674ae726 100644
--- a/drivers/acpi/acpica/excreate.c
+++ b/drivers/acpi/acpica/excreate.c
@@ -279,6 +279,7 @@ acpi_ex_create_region(u8 * aml_start,
 	obj_desc->region.space_id = space_id;
 	obj_desc->region.address = 0;
 	obj_desc->region.length = 0;
+	obj_desc->region.pointer = NULL;
 	obj_desc->region.node = node;
 	obj_desc->region.handler = NULL;
 	obj_desc->common.flags &=
diff --git a/drivers/acpi/acpica/exregion.c b/drivers/acpi/acpica/exregion.c
index 82b713a9a193..48c19908fa4e 100644
--- a/drivers/acpi/acpica/exregion.c
+++ b/drivers/acpi/acpica/exregion.c
@@ -509,8 +509,15 @@ acpi_ex_data_table_space_handler(u32 function,
 				 u64 *value,
 				 void *handler_context, void *region_context)
 {
+	struct acpi_data_table_space_context *mapping;
+	char *pointer;
+
 	ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
 
+	mapping = (struct acpi_data_table_space_context *) region_context;
+	pointer = ACPI_CAST_PTR(char, mapping->pointer) +
+	    (address - ACPI_PTR_TO_PHYSADDR(mapping->pointer));
+
 	/*
 	 * Perform the memory read or write. The bit_width was already
 	 * validated.
@@ -518,14 +525,14 @@ acpi_ex_data_table_space_handler(u32 function,
 	switch (function) {
 	case ACPI_READ:
 
-		memcpy(ACPI_CAST_PTR(char, value),
-		       ACPI_PHYSADDR_TO_PTR(address), ACPI_DIV_8(bit_width));
+		memcpy(ACPI_CAST_PTR(char, value), pointer,
+		       ACPI_DIV_8(bit_width));
 		break;
 
 	case ACPI_WRITE:
 
-		memcpy(ACPI_PHYSADDR_TO_PTR(address),
-		       ACPI_CAST_PTR(char, value), ACPI_DIV_8(bit_width));
+		memcpy(pointer, ACPI_CAST_PTR(char, value),
+		       ACPI_DIV_8(bit_width));
 		break;
 
 	default:
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index 248242dca28d..700c2449e85a 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -1221,6 +1221,10 @@ struct acpi_mem_space_context {
 	struct acpi_mem_mapping *first_mm;
 };
 
+struct acpi_data_table_space_context {
+	void *pointer;
+};
+
 /*
  * struct acpi_memory_list is used only if the ACPICA local cache is enabled
  */
-- 
cgit v1.2.3


From 5d6e59665d8bb0f8fa4d47726a93326f8ddfb448 Mon Sep 17 00:00:00 2001
From: Jessica Clarke <jrtc27@jrtc27.com>
Date: Wed, 22 Dec 2021 17:22:28 +0100
Subject: ACPICA: Use original pointer for virtual origin tables

ACPICA commit dfa3feffa8f760b686207d09dc880cd2f26c72af

Currently the pointer to the table is cast to acpi_physical_address and
later cast back to a pointer to be dereferenced. Whether or not this is
supported is implementation-defined.

On CHERI, and thus Arm's experimental Morello prototype architecture,
pointers are represented as capabilities, which are unforgeable bounded
pointers, providing always-on fine-grained spatial memory safety. This
means that any pointer cast to a plain integer will lose all its
associated metadata, and when cast back to a pointer it will give a
null-derived pointer (one that has the same metadata as null but an
address equal to the integer) that will trap on any dereference. As a
result, this is an implementation where acpi_physical_address cannot be
used as a hack to store real pointers.

Thus, alter the lifecycle of table descriptors. Internal physical tables
keep the current behaviour where only the address is set on install, and
the pointer is set on acquire. Virtual tables (internal and external)
now store the pointer on initialisation and use that on acquire (which
will redundantly set *table_ptr to itself, but changing that is both
unnecessary and overly complicated as acpi_tb_acquire_table is called with
both a pointer to a variable and a pointer to Table->Pointer itself).

This requires propagating the (possible) table pointer everywhere in
order to make sure pointers make it through to acpi_tb_acquire_temp_table,
which requires a change to the acpi_install_table interface. Instead of
taking an ACPI_PHYSADDR_TYPE and a boolean indicating whether it's
physical or virtual, it is now split into acpi_install_table (that takes
an external virtual table pointer) and acpi_install_physical_table (that
takes an ACPI_PHYSADDR_TYPE for an internal physical table address).
This also has the benefit of providing a cleaner API.

Link: https://github.com/acpica/acpica/commit/dfa3feff
Signed-off-by: Bob Moore <robert.moore@intel.com>
[ rjw: Adjust the code in tables.c to match interface changes ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpica/actables.h |  8 +++-
 drivers/acpi/acpica/exconfig.c |  2 +-
 drivers/acpi/acpica/tbdata.c   | 93 ++++++++++++++++++++++++++++--------------
 drivers/acpi/acpica/tbfadt.c   |  6 +--
 drivers/acpi/acpica/tbinstal.c | 15 +++++--
 drivers/acpi/acpica/tbutils.c  |  2 +-
 drivers/acpi/acpica/tbxfload.c | 52 ++++++++++++++++-------
 drivers/acpi/tables.c          |  4 +-
 include/acpi/acpixf.h          |  6 ++-
 9 files changed, 129 insertions(+), 59 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/acpica/actables.h b/drivers/acpi/acpica/actables.h
index e2d0046799a2..533802fe73e9 100644
--- a/drivers/acpi/acpica/actables.h
+++ b/drivers/acpi/acpica/actables.h
@@ -35,7 +35,8 @@ acpi_tb_init_table_descriptor(struct acpi_table_desc *table_desc,
 
 acpi_status
 acpi_tb_acquire_temp_table(struct acpi_table_desc *table_desc,
-			   acpi_physical_address address, u8 flags);
+			   acpi_physical_address address,
+			   u8 flags, struct acpi_table_header *table);
 
 void acpi_tb_release_temp_table(struct acpi_table_desc *table_desc);
 
@@ -86,6 +87,7 @@ acpi_tb_release_table(struct acpi_table_header *table,
 acpi_status
 acpi_tb_install_standard_table(acpi_physical_address address,
 			       u8 flags,
+			       struct acpi_table_header *table,
 			       u8 reload, u8 override, u32 *table_index);
 
 void acpi_tb_uninstall_table(struct acpi_table_desc *table_desc);
@@ -95,7 +97,9 @@ acpi_tb_load_table(u32 table_index, struct acpi_namespace_node *parent_node);
 
 acpi_status
 acpi_tb_install_and_load_table(acpi_physical_address address,
-			       u8 flags, u8 override, u32 *table_index);
+			       u8 flags,
+			       struct acpi_table_header *table,
+			       u8 override, u32 *table_index);
 
 acpi_status acpi_tb_unload_table(u32 table_index);
 
diff --git a/drivers/acpi/acpica/exconfig.c b/drivers/acpi/acpica/exconfig.c
index 0cd9b3738e76..6c2685a6a4c1 100644
--- a/drivers/acpi/acpica/exconfig.c
+++ b/drivers/acpi/acpica/exconfig.c
@@ -411,7 +411,7 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc,
 	acpi_ex_exit_interpreter();
 	status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
 						ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
-						TRUE, &table_index);
+						table, TRUE, &table_index);
 	acpi_ex_enter_interpreter();
 	if (ACPI_FAILURE(status)) {
 
diff --git a/drivers/acpi/acpica/tbdata.c b/drivers/acpi/acpica/tbdata.c
index ebbca109edcb..89f08de67e6d 100644
--- a/drivers/acpi/acpica/tbdata.c
+++ b/drivers/acpi/acpica/tbdata.c
@@ -89,14 +89,27 @@ acpi_tb_init_table_descriptor(struct acpi_table_desc *table_desc,
 {
 
 	/*
-	 * Initialize the table descriptor. Set the pointer to NULL, since the
-	 * table is not fully mapped at this time.
+	 * Initialize the table descriptor. Set the pointer to NULL for external
+	 * tables, since the table is not fully mapped at this time.
 	 */
 	memset(table_desc, 0, sizeof(struct acpi_table_desc));
 	table_desc->address = address;
 	table_desc->length = table->length;
 	table_desc->flags = flags;
 	ACPI_MOVE_32_TO_32(table_desc->signature.ascii, table->signature);
+
+	switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
+	case ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL:
+	case ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL:
+
+		table_desc->pointer = table;
+		break;
+
+	case ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL:
+	default:
+
+		break;
+	}
 }
 
 /*******************************************************************************
@@ -132,9 +145,7 @@ acpi_tb_acquire_table(struct acpi_table_desc *table_desc,
 	case ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL:
 	case ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL:
 
-		table = ACPI_CAST_PTR(struct acpi_table_header,
-				      ACPI_PHYSADDR_TO_PTR(table_desc->
-							   address));
+		table = table_desc->pointer;
 		break;
 
 	default:
@@ -196,6 +207,8 @@ acpi_tb_release_table(struct acpi_table_header *table,
  * PARAMETERS:  table_desc          - Table descriptor to be acquired
  *              address             - Address of the table
  *              flags               - Allocation flags of the table
+ *              table               - Pointer to the table (required for virtual
+ *                                    origins, optional for physical)
  *
  * RETURN:      Status
  *
@@ -208,49 +221,52 @@ acpi_tb_release_table(struct acpi_table_header *table,
 
 acpi_status
 acpi_tb_acquire_temp_table(struct acpi_table_desc *table_desc,
-			   acpi_physical_address address, u8 flags)
+			   acpi_physical_address address,
+			   u8 flags, struct acpi_table_header *table)
 {
-	struct acpi_table_header *table_header;
+	u8 mapped_table = FALSE;
 
 	switch (flags & ACPI_TABLE_ORIGIN_MASK) {
 	case ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL:
 
 		/* Get the length of the full table from the header */
 
-		table_header =
-		    acpi_os_map_memory(address,
-				       sizeof(struct acpi_table_header));
-		if (!table_header) {
-			return (AE_NO_MEMORY);
+		if (!table) {
+			table =
+			    acpi_os_map_memory(address,
+					       sizeof(struct
+						      acpi_table_header));
+			if (!table) {
+				return (AE_NO_MEMORY);
+			}
+
+			mapped_table = TRUE;
 		}
 
-		acpi_tb_init_table_descriptor(table_desc, address, flags,
-					      table_header);
-		acpi_os_unmap_memory(table_header,
-				     sizeof(struct acpi_table_header));
-		return (AE_OK);
+		break;
 
 	case ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL:
 	case ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL:
 
-		table_header = ACPI_CAST_PTR(struct acpi_table_header,
-					     ACPI_PHYSADDR_TO_PTR(address));
-		if (!table_header) {
-			return (AE_NO_MEMORY);
+		if (!table) {
+			return_ACPI_STATUS(AE_BAD_PARAMETER);
 		}
 
-		acpi_tb_init_table_descriptor(table_desc, address, flags,
-					      table_header);
-		return (AE_OK);
+		break;
 
 	default:
 
-		break;
+		/* Table is not valid yet */
+
+		return (AE_NO_MEMORY);
 	}
 
-	/* Table is not valid yet */
+	acpi_tb_init_table_descriptor(table_desc, address, flags, table);
+	if (mapped_table) {
+		acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+	}
 
-	return (AE_NO_MEMORY);
+	return (AE_OK);
 }
 
 /*******************************************************************************
@@ -335,7 +351,19 @@ void acpi_tb_invalidate_table(struct acpi_table_desc *table_desc)
 
 	acpi_tb_release_table(table_desc->pointer, table_desc->length,
 			      table_desc->flags);
-	table_desc->pointer = NULL;
+
+	switch (table_desc->flags & ACPI_TABLE_ORIGIN_MASK) {
+	case ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL:
+
+		table_desc->pointer = NULL;
+		break;
+
+	case ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL:
+	case ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL:
+	default:
+
+		break;
+	}
 
 	return_VOID;
 }
@@ -959,6 +987,9 @@ acpi_tb_load_table(u32 table_index, struct acpi_namespace_node *parent_node)
  *
  * PARAMETERS:  address                 - Physical address of the table
  *              flags                   - Allocation flags of the table
+ *              table                   - Pointer to the table (required for
+ *                                        virtual origins, optional for
+ *                                        physical)
  *              override                - Whether override should be performed
  *              table_index             - Where table index is returned
  *
@@ -970,7 +1001,9 @@ acpi_tb_load_table(u32 table_index, struct acpi_namespace_node *parent_node)
 
 acpi_status
 acpi_tb_install_and_load_table(acpi_physical_address address,
-			       u8 flags, u8 override, u32 *table_index)
+			       u8 flags,
+			       struct acpi_table_header *table,
+			       u8 override, u32 *table_index)
 {
 	acpi_status status;
 	u32 i;
@@ -979,7 +1012,7 @@ acpi_tb_install_and_load_table(acpi_physical_address address,
 
 	/* Install the table and load it into the namespace */
 
-	status = acpi_tb_install_standard_table(address, flags, TRUE,
+	status = acpi_tb_install_standard_table(address, flags, table, TRUE,
 						override, &i);
 	if (ACPI_FAILURE(status)) {
 		goto exit;
diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c
index 5174abfa8af9..047bd094ba68 100644
--- a/drivers/acpi/acpica/tbfadt.c
+++ b/drivers/acpi/acpica/tbfadt.c
@@ -313,7 +313,7 @@ void acpi_tb_parse_fadt(void)
 	acpi_tb_install_standard_table((acpi_physical_address)acpi_gbl_FADT.
 				       Xdsdt,
 				       ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
-				       FALSE, TRUE, &acpi_gbl_dsdt_index);
+				       NULL, FALSE, TRUE, &acpi_gbl_dsdt_index);
 
 	/* If Hardware Reduced flag is set, there is no FACS */
 
@@ -322,14 +322,14 @@ void acpi_tb_parse_fadt(void)
 			acpi_tb_install_standard_table((acpi_physical_address)
 						       acpi_gbl_FADT.facs,
 						       ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
-						       FALSE, TRUE,
+						       NULL, FALSE, TRUE,
 						       &acpi_gbl_facs_index);
 		}
 		if (acpi_gbl_FADT.Xfacs) {
 			acpi_tb_install_standard_table((acpi_physical_address)
 						       acpi_gbl_FADT.Xfacs,
 						       ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
-						       FALSE, TRUE,
+						       NULL, FALSE, TRUE,
 						       &acpi_gbl_xfacs_index);
 		}
 	}
diff --git a/drivers/acpi/acpica/tbinstal.c b/drivers/acpi/acpica/tbinstal.c
index 8d1e5b572493..5649f493a1ed 100644
--- a/drivers/acpi/acpica/tbinstal.c
+++ b/drivers/acpi/acpica/tbinstal.c
@@ -79,6 +79,8 @@ acpi_tb_install_table_with_override(struct acpi_table_desc *new_table_desc,
  * PARAMETERS:  address             - Address of the table (might be a virtual
  *                                    address depending on the table_flags)
  *              flags               - Flags for the table
+ *              table               - Pointer to the table (required for virtual
+ *                                    origins, optional for physical)
  *              reload              - Whether reload should be performed
  *              override            - Whether override should be performed
  *              table_index         - Where the table index is returned
@@ -96,6 +98,7 @@ acpi_tb_install_table_with_override(struct acpi_table_desc *new_table_desc,
 acpi_status
 acpi_tb_install_standard_table(acpi_physical_address address,
 			       u8 flags,
+			       struct acpi_table_header *table,
 			       u8 reload, u8 override, u32 *table_index)
 {
 	u32 i;
@@ -106,7 +109,8 @@ acpi_tb_install_standard_table(acpi_physical_address address,
 
 	/* Acquire a temporary table descriptor for validation */
 
-	status = acpi_tb_acquire_temp_table(&new_table_desc, address, flags);
+	status =
+	    acpi_tb_acquire_temp_table(&new_table_desc, address, flags, table);
 	if (ACPI_FAILURE(status)) {
 		ACPI_ERROR((AE_INFO,
 			    "Could not acquire table length at %8.8X%8.8X",
@@ -209,7 +213,8 @@ void acpi_tb_override_table(struct acpi_table_desc *old_table_desc)
 	if (ACPI_SUCCESS(status) && table) {
 		acpi_tb_acquire_temp_table(&new_table_desc,
 					   ACPI_PTR_TO_PHYSADDR(table),
-					   ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL);
+					   ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
+					   table);
 		ACPI_ERROR_ONLY(override_type = "Logical");
 		goto finish_override;
 	}
@@ -220,7 +225,8 @@ void acpi_tb_override_table(struct acpi_table_desc *old_table_desc)
 						 &address, &length);
 	if (ACPI_SUCCESS(status) && address && length) {
 		acpi_tb_acquire_temp_table(&new_table_desc, address,
-					   ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
+					   ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
+					   NULL);
 		ACPI_ERROR_ONLY(override_type = "Physical");
 		goto finish_override;
 	}
@@ -289,7 +295,8 @@ void acpi_tb_uninstall_table(struct acpi_table_desc *table_desc)
 
 	if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
 	    ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL) {
-		ACPI_FREE(ACPI_PHYSADDR_TO_PTR(table_desc->address));
+		ACPI_FREE(table_desc->pointer);
+		table_desc->pointer = NULL;
 	}
 
 	table_desc->address = ACPI_PTR_TO_PHYSADDR(NULL);
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 4b9b329a5a92..5e8d50a4b6a9 100644
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -328,7 +328,7 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
 
 		status = acpi_tb_install_standard_table(address,
 							ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
-							FALSE, TRUE,
+							NULL, FALSE, TRUE,
 							&table_index);
 
 		if (ACPI_SUCCESS(status) &&
diff --git a/drivers/acpi/acpica/tbxfload.c b/drivers/acpi/acpica/tbxfload.c
index 38623049b962..87356d9ad613 100644
--- a/drivers/acpi/acpica/tbxfload.c
+++ b/drivers/acpi/acpica/tbxfload.c
@@ -227,9 +227,7 @@ unlock_and_exit:
  *
  * FUNCTION:    acpi_install_table
  *
- * PARAMETERS:  address             - Address of the ACPI table to be installed.
- *              physical            - Whether the address is a physical table
- *                                    address or not
+ * PARAMETERS:  table               - Pointer to the ACPI table to be installed.
  *
  * RETURN:      Status
  *
@@ -240,28 +238,54 @@ unlock_and_exit:
  ******************************************************************************/
 
 acpi_status ACPI_INIT_FUNCTION
-acpi_install_table(acpi_physical_address address, u8 physical)
+acpi_install_table(struct acpi_table_header *table)
 {
 	acpi_status status;
-	u8 flags;
 	u32 table_index;
 
 	ACPI_FUNCTION_TRACE(acpi_install_table);
 
-	if (physical) {
-		flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
-	} else {
-		flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
-	}
-
-	status = acpi_tb_install_standard_table(address, flags,
-						FALSE, FALSE, &table_index);
+	status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
+						ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
+						table, FALSE, FALSE,
+						&table_index);
 
 	return_ACPI_STATUS(status);
 }
 
 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
 
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_install_physical_table
+ *
+ * PARAMETERS:  address             - Address of the ACPI table to be installed.
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Dynamically install an ACPI table.
+ *              Note: This function should only be invoked after
+ *                    acpi_initialize_tables() and before acpi_load_tables().
+ *
+ ******************************************************************************/
+acpi_status ACPI_INIT_FUNCTION
+acpi_install_physical_table(acpi_physical_address address)
+{
+	acpi_status status;
+	u32 table_index;
+
+	ACPI_FUNCTION_TRACE(acpi_install_physical_table);
+
+	status = acpi_tb_install_standard_table(address,
+						ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
+						NULL, FALSE, FALSE,
+						&table_index);
+
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL_INIT(acpi_install_physical_table)
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_load_table
@@ -298,7 +322,7 @@ acpi_status acpi_load_table(struct acpi_table_header *table, u32 *table_idx)
 	ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
 	status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
 						ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
-						FALSE, &table_index);
+						table, FALSE, &table_index);
 	if (table_idx) {
 		*table_idx = table_index;
 	}
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 71419eb16e09..2fa8f611d0a7 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -723,7 +723,7 @@ static void __init acpi_table_initrd_scan(void)
 		/*
 		 * Mark the table to avoid being used in
 		 * acpi_table_initrd_override(). Though this is not possible
-		 * because override is disabled in acpi_install_table().
+		 * because override is disabled in acpi_install_physical_table().
 		 */
 		if (test_and_set_bit(table_index, acpi_initrd_installed)) {
 			acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
@@ -734,7 +734,7 @@ static void __init acpi_table_initrd_scan(void)
 			table->signature, table->oem_id,
 			table->oem_table_id);
 		acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
-		acpi_install_table(acpi_tables_addr + table_offset, TRUE);
+		acpi_install_physical_table(acpi_tables_addr + table_offset);
 next_table:
 		table_offset += table_length;
 		table_index++;
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 73ba13914321..987bb0aa042e 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -454,9 +454,11 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status
  * ACPI table load/unload interfaces
  */
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status ACPI_INIT_FUNCTION
-			    acpi_install_table(acpi_physical_address address,
-					       u8 physical))
+			    acpi_install_table(struct acpi_table_header *table))
 
+ACPI_EXTERNAL_RETURN_STATUS(acpi_status ACPI_INIT_FUNCTION
+			    acpi_install_physical_table(acpi_physical_address
+							address))
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
 			    acpi_load_table(struct acpi_table_header *table,
 					    u32 *table_idx))
-- 
cgit v1.2.3


From a3e525feaeec436cd9f82f84e345f0d18dc2638f Mon Sep 17 00:00:00 2001
From: Jessica Clarke <jrtc27@jrtc27.com>
Date: Wed, 22 Dec 2021 17:24:44 +0100
Subject: ACPICA: Avoid subobject buffer overflow when validating RSDP
 signature

ACPICA commit 6bb72909c1e3d415aee214104a01bc9834b2d4ce

Since the Signature member is accessed through an struct acpi_table_header, the
pointer to it is only to a 4-char array, and so trying to read past the
4th character, as will be done when it is an RSDP, reads beyond the
bounds of the accessed member. On CHERI, and thus Arm's experimental
Morello prototype architecture, pointers are represented as
capabilities, which are unforgeable bounded pointers, providing
always-on fine-grained spatial memory safety. By default, subobject
bounds enforcement is not enabled, only bounds on allocations, but it is
enabled in the cheri_BSD (a port of free_BSD) kernel as intra-object
overflow attacks are common on operating system kernels, and so this
overflow is detected there and traps.

Link: https://github.com/acpica/acpica/commit/6bb72909
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpica/tbprint.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/acpica/tbprint.c b/drivers/acpi/acpica/tbprint.c
index 254823d494a2..4dac16bd63d3 100644
--- a/drivers/acpi/acpica/tbprint.c
+++ b/drivers/acpi/acpica/tbprint.c
@@ -101,7 +101,8 @@ acpi_tb_print_table_header(acpi_physical_address address,
 		ACPI_INFO(("%-4.4s 0x%8.8X%8.8X %06X",
 			   header->signature, ACPI_FORMAT_UINT64(address),
 			   header->length));
-	} else if (ACPI_VALIDATE_RSDP_SIG(header->signature)) {
+	} else if (ACPI_VALIDATE_RSDP_SIG(ACPI_CAST_PTR(struct acpi_table_rsdp,
+							header)->signature)) {
 
 		/* RSDP has no common fields */
 
-- 
cgit v1.2.3


From 1cdfe9e346b4c5509ffe19ccde880fd259d9f7a3 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Wed, 22 Dec 2021 17:29:45 +0100
Subject: ACPICA: Utilities: Avoid deleting the same object twice in a row

ACPICA commit c11af67d8f7e3d381068ce7771322f2b5324d687

If original_count is 0 in acpi_ut_update_ref_count (),
acpi_ut_delete_internal_obj () is invoked for the target object, which is
incorrect, because that object has been deleted once already and the
memory allocated to store it may have been reclaimed and allocated
for a different purpose by the host OS.  Moreover, a confusing debug
message following the "Reference Count is already zero, cannot
decrement" warning is printed in that case.

To fix this issue, make acpi_ut_update_ref_count () return after finding
that original_count is 0 and printing the above warning.

Link: https://github.com/acpica/acpica/commit/c11af67d
Link: https://github.com/acpica/acpica/pull/652
Reported-by: Mark Asselstine <mark.asselstine@windriver.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpica/utdelete.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/acpica/utdelete.c b/drivers/acpi/acpica/utdelete.c
index e5ba9795ec69..8d7736d2d269 100644
--- a/drivers/acpi/acpica/utdelete.c
+++ b/drivers/acpi/acpica/utdelete.c
@@ -422,6 +422,7 @@ acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
 			ACPI_WARNING((AE_INFO,
 				      "Obj %p, Reference Count is already zero, cannot decrement\n",
 				      object));
+			return;
 		}
 
 		ACPI_DEBUG_PRINT_RAW((ACPI_DB_ALLOCATIONS,
-- 
cgit v1.2.3


From 24ea5f90ec9548044a6209685c5010edd66ffe8f Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Wed, 22 Dec 2021 17:31:05 +0100
Subject: ACPICA: Executer: Fix the REFCLASS_REFOF case in
 acpi_ex_opcode_1A_0T_1R()

ACPICA commit d984f12041392fa4156b52e2f7e5c5e7bc38ad9e

If Operand[0] is a reference of the ACPI_REFCLASS_REFOF class,
acpi_ex_opcode_1A_0T_1R () calls acpi_ns_get_attached_object () to
obtain return_desc which may require additional resolution with
the help of acpi_ex_read_data_from_field (). If the latter fails,
the reference counter of the original return_desc is decremented
which is incorrect, because acpi_ns_get_attached_object () does not
increment the reference counter of the object returned by it.

This issue may lead to premature deletion of the attached object
while it is still attached and a use-after-free and crash in the
host OS.  For example, this may happen when on evaluation of ref_of()
a local region field where there is no registered handler for the
given Operation Region.

Fix it by making acpi_ex_opcode_1A_0T_1R () return Status right away
after a acpi_ex_read_data_from_field () failure.

Link: https://github.com/acpica/acpica/commit/d984f120
Link: https://github.com/acpica/acpica/pull/685
Reported-by: Lenny Szubowicz <lszubowi@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpica/exoparg1.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/acpica/exoparg1.c b/drivers/acpi/acpica/exoparg1.c
index b639e930d642..44b7c350ed5c 100644
--- a/drivers/acpi/acpica/exoparg1.c
+++ b/drivers/acpi/acpica/exoparg1.c
@@ -1007,7 +1007,8 @@ acpi_status acpi_ex_opcode_1A_0T_1R(struct acpi_walk_state *walk_state)
 						    (walk_state, return_desc,
 						     &temp_desc);
 						if (ACPI_FAILURE(status)) {
-							goto cleanup;
+							return_ACPI_STATUS
+							    (status);
 						}
 
 						return_desc = temp_desc;
-- 
cgit v1.2.3


From 9a3b8655db1ada31c82189ae13f40eb25da48c35 Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@arm.com>
Date: Wed, 22 Dec 2021 17:31:54 +0100
Subject: ACPICA: Fix wrong interpretation of PCC address

ACPICA commit 41be6afacfdaec2dba3a5ed368736babc2a7aa5c

With the PCC Opregion in the firmware and we are hitting below kernel crash:

-->8
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010
 Workqueue: pm pm_runtime_work
 pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 pc : __memcpy+0x54/0x260
 lr : acpi_ex_write_data_to_field+0xb8/0x194
 Call trace:
  __memcpy+0x54/0x260
  acpi_ex_store_object_to_node+0xa4/0x1d4
  acpi_ex_store+0x44/0x164
  acpi_ex_opcode_1A_1T_1R+0x25c/0x508
  acpi_ds_exec_end_op+0x1b4/0x44c
  acpi_ps_parse_loop+0x3a8/0x614
  acpi_ps_parse_aml+0x90/0x2f4
  acpi_ps_execute_method+0x11c/0x19c
  acpi_ns_evaluate+0x1ec/0x2b0
  acpi_evaluate_object+0x170/0x2b0
  acpi_device_set_power+0x118/0x310
  acpi_dev_suspend+0xd4/0x180
  acpi_subsys_runtime_suspend+0x28/0x38
  __rpm_callback+0x74/0x328
  rpm_suspend+0x2d8/0x624
  pm_runtime_work+0xa4/0xb8
  process_one_work+0x194/0x25c
  worker_thread+0x260/0x49c
  kthread+0x14c/0x30c
  ret_from_fork+0x10/0x20
 Code: f9000006 f81f80a7 d65f03c0 361000c2 (b9400026)
 ---[ end trace 24d8a032fa77b68a ]---

The reason for the crash is that the PCC channel index passed via region.address
in acpi_ex_store_object_to_node is interpreted as the channel subtype
incorrectly.

Assuming the PCC op_region support is not used by any other type, let us
remove the subtype check as the AML has no access to the subtype information.
Once we remove it, the kernel crash disappears and correctly complains about
missing PCC Opregion handler.

ACPI Error: No handler for Region [PFRM] ((____ptrval____)) [PCC] (20210730/evregion-130)
ACPI Error: Region PCC (ID=10) has no handler (20210730/exfldio-261)
ACPI Error: Aborting method \_SB.ETH0._PS3 due to previous error (AE_NOT_EXIST) (20210730/psparse-531)

Link: https://github.com/acpica/acpica/commit/41be6afa
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpica/exfield.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/acpica/exfield.c b/drivers/acpi/acpica/exfield.c
index 06f3c9df1e22..8618500f23b3 100644
--- a/drivers/acpi/acpica/exfield.c
+++ b/drivers/acpi/acpica/exfield.c
@@ -330,12 +330,7 @@ acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
 		       obj_desc->field.base_byte_offset,
 		       source_desc->buffer.pointer, data_length);
 
-		if ((obj_desc->field.region_obj->region.address ==
-		     PCC_MASTER_SUBSPACE
-		     && MASTER_SUBSPACE_COMMAND(obj_desc->field.
-						base_byte_offset))
-		    || GENERIC_SUBSPACE_COMMAND(obj_desc->field.
-						base_byte_offset)) {
+		if (MASTER_SUBSPACE_COMMAND(obj_desc->field.base_byte_offset)) {
 
 			/* Perform the write */
 
-- 
cgit v1.2.3


From 0acf24ad7e10f547809faefb8069f8f5482eb4d9 Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@arm.com>
Date: Wed, 22 Dec 2021 17:32:54 +0100
Subject: ACPICA: Add support for PCC Opregion special context data

ACPICA commit 55526e8a6133cbf5a9cc0fb75a95dbbac6eb98e6

PCC Opregion added in ACPIC 6.3 requires special context data similar
to GPIO and Generic Serial Bus as it needs to know the internal PCC
buffer and its length as well as the PCC channel index when the opregion
handler is being executed by the OSPM.

Lets add support for the special context data needed by PCC Opregion.

Link: https://github.com/acpica/acpica/commit/55526e8a
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpica/evregion.c | 10 ++++++++++
 include/acpi/actypes.h         |  8 ++++++++
 2 files changed, 18 insertions(+)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/acpica/evregion.c b/drivers/acpi/acpica/evregion.c
index 4ef43c8ef5e7..80b68f216b46 100644
--- a/drivers/acpi/acpica/evregion.c
+++ b/drivers/acpi/acpica/evregion.c
@@ -162,6 +162,16 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
 			return_ACPI_STATUS(AE_NOT_EXIST);
 		}
 
+		if (region_obj->region.space_id == ACPI_ADR_SPACE_PLATFORM_COMM) {
+			struct acpi_pcc_info *ctx =
+			    handler_desc->address_space.context;
+
+			ctx->internal_buffer =
+			    field_obj->field.internal_pcc_buffer;
+			ctx->length = region_obj->region.length;
+			ctx->subspace_id = region_obj->region.address;
+		}
+
 		/*
 		 * We must exit the interpreter because the region setup will
 		 * potentially execute control methods (for example, the _REG method
diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
index 83a7ee1fbd7c..69e89d572b9e 100644
--- a/include/acpi/actypes.h
+++ b/include/acpi/actypes.h
@@ -1103,6 +1103,14 @@ struct acpi_connection_info {
 	u8 access_length;
 };
 
+/* Special Context data for PCC Opregion (ACPI 6.3) */
+
+struct acpi_pcc_info {
+	u8 subspace_id;
+	u16 length;
+	u8 *internal_buffer;
+};
+
 typedef
 acpi_status (*acpi_adr_space_setup) (acpi_handle region_handle,
 				     u32 function,
-- 
cgit v1.2.3


From 1d4e0b3abb168b2ee1eca99c527cffa1b80b6161 Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Date: Wed, 22 Dec 2021 17:33:51 +0100
Subject: ACPICA: Hardware: Do not flush CPU cache when entering S4 and S5

ACPICA commit 3dd7e1f3996456ef81bfe14cba29860e8d42949e

According to ACPI 6.4, Section 16.2, the CPU cache flushing is
required on entering to S1, S2, and S3, but the ACPICA code
flushes the CPU cache regardless of the sleep state.

Blind cache flush on entering S5 causes problems for TDX.

Flushing happens with WBINVD that is not supported in the TDX
environment.

TDX only supports S5 and adjusting ACPICA code to conform to the
spec more strictly fixes the issue.

Link: https://github.com/acpica/acpica/commit/3dd7e1f3
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpica/hwesleep.c  | 4 +++-
 drivers/acpi/acpica/hwsleep.c   | 4 +++-
 drivers/acpi/acpica/hwxfsleep.c | 2 --
 3 files changed, 6 insertions(+), 4 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/acpica/hwesleep.c b/drivers/acpi/acpica/hwesleep.c
index 808fdf54aeeb..7ee2939c08cd 100644
--- a/drivers/acpi/acpica/hwesleep.c
+++ b/drivers/acpi/acpica/hwesleep.c
@@ -104,7 +104,9 @@ acpi_status acpi_hw_extended_sleep(u8 sleep_state)
 
 	/* Flush caches, as per ACPI specification */
 
-	ACPI_FLUSH_CPU_CACHE();
+	if (sleep_state < ACPI_STATE_S4) {
+		ACPI_FLUSH_CPU_CACHE();
+	}
 
 	status = acpi_os_enter_sleep(sleep_state, sleep_control, 0);
 	if (status == AE_CTRL_TERMINATE) {
diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c
index 34a3825f25d3..5efa3d8e483e 100644
--- a/drivers/acpi/acpica/hwsleep.c
+++ b/drivers/acpi/acpica/hwsleep.c
@@ -110,7 +110,9 @@ acpi_status acpi_hw_legacy_sleep(u8 sleep_state)
 
 	/* Flush caches, as per ACPI specification */
 
-	ACPI_FLUSH_CPU_CACHE();
+	if (sleep_state < ACPI_STATE_S4) {
+		ACPI_FLUSH_CPU_CACHE();
+	}
 
 	status = acpi_os_enter_sleep(sleep_state, pm1a_control, pm1b_control);
 	if (status == AE_CTRL_TERMINATE) {
diff --git a/drivers/acpi/acpica/hwxfsleep.c b/drivers/acpi/acpica/hwxfsleep.c
index e4cde23a2906..ba77598ee43e 100644
--- a/drivers/acpi/acpica/hwxfsleep.c
+++ b/drivers/acpi/acpica/hwxfsleep.c
@@ -162,8 +162,6 @@ acpi_status acpi_enter_sleep_state_s4bios(void)
 		return_ACPI_STATUS(status);
 	}
 
-	ACPI_FLUSH_CPU_CACHE();
-
 	status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
 				    (u32)acpi_gbl_FADT.s4_bios_request, 8);
 	if (ACPI_FAILURE(status)) {
-- 
cgit v1.2.3


From 9f52815422a4b81dc9093fae338a9c41a9ff6657 Mon Sep 17 00:00:00 2001
From: Bob Moore <robert.moore@intel.com>
Date: Wed, 22 Dec 2021 17:35:12 +0100
Subject: ACPICA: Change a return_ACPI_STATUS (AE_BAD_PARAMETER)

ACPICA commit ff803279dde7a3e068a6a698d8c69503cd159ad7

To simply return (AE_BAD_PARAMETER); to fix compilation on MSVC.

Link: https://github.com/acpica/acpica/commit/ff803279
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpica/tbdata.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/acpica/tbdata.c b/drivers/acpi/acpica/tbdata.c
index 89f08de67e6d..20360a9db482 100644
--- a/drivers/acpi/acpica/tbdata.c
+++ b/drivers/acpi/acpica/tbdata.c
@@ -249,7 +249,7 @@ acpi_tb_acquire_temp_table(struct acpi_table_desc *table_desc,
 	case ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL:
 
 		if (!table) {
-			return_ACPI_STATUS(AE_BAD_PARAMETER);
+			return (AE_BAD_PARAMETER);
 		}
 
 		break;
-- 
cgit v1.2.3


From b70d6f07ed31f74b5d702a2bda1d592cc6622a02 Mon Sep 17 00:00:00 2001
From: Bob Moore <robert.moore@intel.com>
Date: Wed, 22 Dec 2021 17:35:49 +0100
Subject: ACPICA: Fixed a couple of warnings under MSVC

ACPICA commit 86c919d2bad08491fc91ffa53e9b169092de8622

Repaired with casts.

Link: https://github.com/acpica/acpica/commit/86c919d2
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/acpica/evregion.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/acpica/evregion.c b/drivers/acpi/acpica/evregion.c
index 80b68f216b46..b9d77d327d38 100644
--- a/drivers/acpi/acpica/evregion.c
+++ b/drivers/acpi/acpica/evregion.c
@@ -168,8 +168,8 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
 
 			ctx->internal_buffer =
 			    field_obj->field.internal_pcc_buffer;
-			ctx->length = region_obj->region.length;
-			ctx->subspace_id = region_obj->region.address;
+			ctx->length = (u16)region_obj->region.length;
+			ctx->subspace_id = (u8)region_obj->region.address;
 		}
 
 		/*
-- 
cgit v1.2.3


From 17f18417d6da07bbaafce84f80fa25d860b6e6d1 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Tue, 28 Dec 2021 14:14:23 +0100
Subject: ACPI: sysfs: use default_groups in kobj_type

There are currently 2 ways to create a set of sysfs files for a
kobj_type, through the default_attrs field, and the default_groups
field.  Move the ACPI sysfs code to use default_groups field which has
been the preferred way since aa30f47cf666 ("kobject: Add support for
default attribute groups to kobj_type") so that we can soon get rid of
the obsolete default_attrs field.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/cppc_acpi.c    | 3 ++-
 drivers/acpi/device_sysfs.c | 3 ++-
 drivers/acpi/sysfs.c        | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index b62c87b8ce4a..48af1f6f94ca 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -179,10 +179,11 @@ static struct attribute *cppc_attrs[] = {
 	&lowest_freq.attr,
 	NULL
 };
+ATTRIBUTE_GROUPS(cppc);
 
 static struct kobj_type cppc_ktype = {
 	.sysfs_ops = &kobj_sysfs_ops,
-	.default_attrs = cppc_attrs,
+	.default_groups = cppc_groups,
 };
 
 static int check_pcc_chan(int pcc_ss_id, bool chk_err_bit)
diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c
index 61271e61c307..d5d6403ba07b 100644
--- a/drivers/acpi/device_sysfs.c
+++ b/drivers/acpi/device_sysfs.c
@@ -53,6 +53,7 @@ static struct attribute *acpi_data_node_default_attrs[] = {
 	&data_node_path.attr,
 	NULL
 };
+ATTRIBUTE_GROUPS(acpi_data_node_default);
 
 #define to_data_node(k) container_of(k, struct acpi_data_node, kobj)
 #define to_attr(a) container_of(a, struct acpi_data_node_attr, attr)
@@ -79,7 +80,7 @@ static void acpi_data_node_release(struct kobject *kobj)
 
 static struct kobj_type acpi_data_node_ktype = {
 	.sysfs_ops = &acpi_data_node_sysfs_ops,
-	.default_attrs = acpi_data_node_default_attrs,
+	.default_groups = acpi_data_node_default_groups,
 	.release = acpi_data_node_release,
 };
 
diff --git a/drivers/acpi/sysfs.c b/drivers/acpi/sysfs.c
index 00c0ebaab29f..a4b638bea6f1 100644
--- a/drivers/acpi/sysfs.c
+++ b/drivers/acpi/sysfs.c
@@ -939,10 +939,11 @@ static struct attribute *hotplug_profile_attrs[] = {
 	&hotplug_enabled_attr.attr,
 	NULL
 };
+ATTRIBUTE_GROUPS(hotplug_profile);
 
 static struct kobj_type acpi_hotplug_profile_ktype = {
 	.sysfs_ops = &kobj_sysfs_ops,
-	.default_attrs = hotplug_profile_attrs,
+	.default_groups = hotplug_profile_groups,
 };
 
 void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
-- 
cgit v1.2.3


From e96c1197aca628f7d2480a1cc3214912b40b3414 Mon Sep 17 00:00:00 2001
From: Thomas Weißschuh <linux@weissschuh.net>
Date: Wed, 22 Dec 2021 22:20:14 +0100
Subject: ACPI: battery: Add the ThinkPad "Not Charging" quirk
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The EC/ACPI firmware on Lenovo ThinkPads used to report a status
of "Unknown" when the battery is between the charge start and
charge stop thresholds. On Windows, it reports "Not Charging"
so the quirk has been added to also report correctly.

Now the "status" attribute returns "Not Charging" when the
battery on ThinkPads is not physicaly charging.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/battery.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 8afa85d6eb6a..ead0114f27c9 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -53,6 +53,7 @@ static int battery_bix_broken_package;
 static int battery_notification_delay_ms;
 static int battery_ac_is_broken;
 static int battery_check_pmic = 1;
+static int battery_quirk_notcharging;
 static unsigned int cache_time = 1000;
 module_param(cache_time, uint, 0644);
 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
@@ -217,6 +218,8 @@ static int acpi_battery_get_property(struct power_supply *psy,
 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
 		else if (acpi_battery_is_charged(battery))
 			val->intval = POWER_SUPPLY_STATUS_FULL;
+		else if (battery_quirk_notcharging)
+			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 		else
 			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 		break;
@@ -1111,6 +1114,12 @@ battery_do_not_check_pmic_quirk(const struct dmi_system_id *d)
 	return 0;
 }
 
+static int __init battery_quirk_not_charging(const struct dmi_system_id *d)
+{
+	battery_quirk_notcharging = 1;
+	return 0;
+}
+
 static const struct dmi_system_id bat_dmi_table[] __initconst = {
 	{
 		/* NEC LZ750/LS */
@@ -1155,6 +1164,19 @@ static const struct dmi_system_id bat_dmi_table[] __initconst = {
 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
 		},
 	},
+	{
+		/*
+		 * On Lenovo ThinkPads the BIOS specification defines
+		 * a state when the bits for charging and discharging
+		 * are both set to 0. That state is "Not Charging".
+		 */
+		.callback = battery_quirk_not_charging,
+		.ident = "Lenovo ThinkPad",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad"),
+		},
+	},
 	{},
 };
 
-- 
cgit v1.2.3


From 843438deebe247fcf7e4d3dd5655c9df4b5412fd Mon Sep 17 00:00:00 2001
From: Yang Li <yang.lee@linux.alibaba.com>
Date: Thu, 23 Dec 2021 10:28:56 +0800
Subject: PCI/ACPI: Fix acpi_pci_osc_control_set() kernel-doc comment

Add the description of @support and remove @req in
acpi_pci_osc_control_set() kernel-doc comment to remove warnings found
by running scripts/kernel-doc, which is caused by using 'make W=1'.

drivers/acpi/pci_root.c:337: warning: Excess function parameter 'req'
description in 'acpi_pci_osc_control_set'
drivers/acpi/pci_root.c:337: warning: Function parameter or member
'support' not described in 'acpi_pci_osc_control_set'

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Fixes: 6bc779ee05d4 ("PCI/ACPI: Check for _OSC support in acpi_pci_osc_control_set()")
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/pci_root.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ab2f7dfb0c44..b0f19f3fc798 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -324,7 +324,7 @@ EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
  * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
  * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
  * @mask: Mask of _OSC bits to request control of, place to store control mask.
- * @req: Mask of _OSC bits the control of is essential to the caller.
+ * @support: _OSC supported capability.
  *
  * Run _OSC query for @mask and if that is successful, compare the returned
  * mask of control bits with @req.  If all of the @req bits are set in the
-- 
cgit v1.2.3


From f85196bdd5a50da74670250564740fc852b3c239 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Thu, 30 Dec 2021 12:57:47 +0100
Subject: ACPI: scan: Create platform device for BCM4752 and LNV4752 ACPI nodes

BCM4752 and LNV4752 ACPI nodes describe a Broadcom 4752 GPS module
attached to an UART of the system.

The GPS modules talk a custom protocol which only works with a closed-
source Android gpsd daemon which knows this protocol.

The ACPI nodes also describe GPIOs to turn the GPS on/off these are
handled by the net/rfkill/rfkill-gpio.c code. This handling predates the
addition of enumeration of ACPI instantiated serdevs to the kernel and
was broken by that addition, because the ACPI scan code now no longer
instantiates platform_device-s for these nodes.

Rename the i2c_multi_instantiate_ids HID list to ignore_serial_bus_ids
and add the BCM4752 and LNV4752 HIDs, so that rfkill-gpio gets
a platform_device to bind to again; and so that a tty cdev for gpsd
gets created for these.

Fixes: e361d1f85855 ("ACPI / scan: Fix enumeration for special UART devices")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/scan.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index a9adcda39d40..4dd3a9efcd0f 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1710,6 +1710,7 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
 {
 	struct list_head resource_list;
 	bool is_serial_bus_slave = false;
+	static const struct acpi_device_id ignore_serial_bus_ids[] = {
 	/*
 	 * These devices have multiple I2cSerialBus resources and an i2c-client
 	 * must be instantiated for each, each with its own i2c_device_id.
@@ -1718,11 +1719,18 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
 	 * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows
 	 * which i2c_device_id to use for each resource.
 	 */
-	static const struct acpi_device_id i2c_multi_instantiate_ids[] = {
 		{"BSG1160", },
 		{"BSG2150", },
 		{"INT33FE", },
 		{"INT3515", },
+	/*
+	 * HIDs of device with an UartSerialBusV2 resource for which userspace
+	 * expects a regular tty cdev to be created (instead of the in kernel
+	 * serdev) and which have a kernel driver which expects a platform_dev
+	 * such as the rfkill-gpio driver.
+	 */
+		{"BCM4752", },
+		{"LNV4752", },
 		{}
 	};
 
@@ -1736,8 +1744,7 @@ static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
 	     fwnode_property_present(&device->fwnode, "baud")))
 		return true;
 
-	/* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */
-	if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids))
+	if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
 		return false;
 
 	INIT_LIST_HEAD(&resource_list);
-- 
cgit v1.2.3


From 35f9e773bb883a1be87410570f92c8c438e0478b Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Thu, 30 Dec 2021 15:17:20 +0100
Subject: ACPI / x86: Add acpi_quirk_skip_[i2c_client|serdev]_enumeration()
 helpers

x86 ACPI boards which ship with only Android as their factory image usually
declare a whole bunch of bogus I2C devs in their ACPI tables and sometimes
there are issues with serdev devices on these boards too, e.g. the resource
points to the wrong serdev_controller.

Instantiating I2C / serdev devs for these bogus devs causes various issues,
e.g. GPIO/IRQ resource conflicts because sometimes drivers do bind to them.
The Android x86 kernel fork shipped on these devices has some special code
to remove the bogus I2C clients (and serdevs are ignored completely).

Introduce acpi_quirk_skip_i2c_client_enumeration() and
acpi_quirk_skip_serdev_enumeration() helpers. Which can be used by the I2C/
serdev code to skip instantiating any I2C or serdev devs on broken boards.

These 2 helpers are added to drivers/acpi/x86/utils.c so that the DMI table
can be shared between the I2C and serdev code.

Note these boards typically do actually have I2C and serdev devices, just
different ones then the ones described in their DSDT. The devices which
are actually present are manually instantiated by the
drivers/platform/x86/x86-android-tablets.c kernel module.

The new helpers are only build if CONFIG_X86_ANDROID_TABLETS is enabled,
otherwise they are empty stubs to not unnecessarily grow the kernel size.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/x86/utils.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++
 include/acpi/acpi_bus.h  |  16 +++++++
 2 files changed, 127 insertions(+)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index f22f23933063..ef9ee8bbe4e6 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -10,6 +10,7 @@
 
 #include <linux/acpi.h>
 #include <linux/dmi.h>
+#include <linux/platform_device.h>
 #include <asm/cpu_device_id.h>
 #include <asm/intel-family.h>
 #include "../internal.h"
@@ -160,3 +161,113 @@ bool force_storage_d3(void)
 {
 	return x86_match_cpu(storage_d3_cpu_ids);
 }
+
+#if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
+/*
+ * x86 ACPI boards which ship with only Android as their factory image usually
+ * declare a whole bunch of bogus I2C devices in their ACPI tables and sometimes
+ * there are issues with serdev devices on these boards too, e.g. the resource
+ * points to the wrong serdev_controller.
+ *
+ * Instantiating I2C / serdev devs for these bogus devs causes various issues,
+ * e.g. GPIO/IRQ resource conflicts because sometimes drivers do bind to them.
+ * The Android x86 kernel fork shipped on these devices has some special code
+ * to remove the bogus I2C clients (and AFAICT serdevs are ignored completely).
+ *
+ * The acpi_quirk_skip_*_enumeration() functions below are used by the I2C or
+ * serdev code to skip instantiating any I2C or serdev devs on broken boards.
+ *
+ * In case of I2C an exception is made for HIDs on the i2c_acpi_known_good_ids
+ * list. These are known to always be correct (and in case of the audio-codecs
+ * the drivers heavily rely on the codec being enumerated through ACPI).
+ *
+ * Note these boards typically do actually have I2C and serdev devices,
+ * just different ones then the ones described in their DSDT. The devices
+ * which are actually present are manually instantiated by the
+ * drivers/platform/x86/x86-android-tablets.c kernel module.
+ */
+#define ACPI_QUIRK_SKIP_I2C_CLIENTS				BIT(0)
+#define ACPI_QUIRK_UART1_TTY_UART2_SKIP				BIT(1)
+
+static const struct dmi_system_id acpi_skip_serial_bus_enumeration_ids[] = {
+	{
+		.matches = {
+			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "ME176C"),
+		},
+		.driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
+					ACPI_QUIRK_UART1_TTY_UART2_SKIP),
+	},
+	{
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "TF103C"),
+		},
+		.driver_data = (void *)ACPI_QUIRK_SKIP_I2C_CLIENTS,
+	},
+	{
+		/* Whitelabel (sold as various brands) TM800A550L */
+		.matches = {
+			DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
+			DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
+			/* Above strings are too generic, also match on BIOS version */
+			DMI_MATCH(DMI_BIOS_VERSION, "ZY-8-BI-PX4S70VTR400-X423B-005-D"),
+		},
+		.driver_data = (void *)ACPI_QUIRK_SKIP_I2C_CLIENTS,
+	},
+	{}
+};
+
+static const struct acpi_device_id i2c_acpi_known_good_ids[] = {
+	{ "10EC5640", 0 }, /* RealTek ALC5640 audio codec */
+	{ "INT33F4", 0 },  /* X-Powers AXP288 PMIC */
+	{ "INT33FD", 0 },  /* Intel Crystal Cove PMIC */
+	{ "NPCE69A", 0 },  /* Asus Transformer keyboard dock */
+	{}
+};
+
+bool acpi_quirk_skip_i2c_client_enumeration(struct acpi_device *adev)
+{
+	const struct dmi_system_id *dmi_id;
+	long quirks;
+
+	dmi_id = dmi_first_match(acpi_skip_serial_bus_enumeration_ids);
+	if (!dmi_id)
+		return false;
+
+	quirks = (unsigned long)dmi_id->driver_data;
+	if (!(quirks & ACPI_QUIRK_SKIP_I2C_CLIENTS))
+		return false;
+
+	return acpi_match_device_ids(adev, i2c_acpi_known_good_ids);
+}
+EXPORT_SYMBOL_GPL(acpi_quirk_skip_i2c_client_enumeration);
+
+int acpi_quirk_skip_serdev_enumeration(struct device *controller_parent, bool *skip)
+{
+	struct acpi_device *adev = ACPI_COMPANION(controller_parent);
+	const struct dmi_system_id *dmi_id;
+	long quirks = 0;
+
+	*skip = false;
+
+	/* !dev_is_platform() to not match on PNP enumerated debug UARTs */
+	if (!adev || !adev->pnp.unique_id || !dev_is_platform(controller_parent))
+		return 0;
+
+	dmi_id = dmi_first_match(acpi_skip_serial_bus_enumeration_ids);
+	if (dmi_id)
+		quirks = (unsigned long)dmi_id->driver_data;
+
+	if (quirks & ACPI_QUIRK_UART1_TTY_UART2_SKIP) {
+		if (!strcmp(adev->pnp.unique_id, "1"))
+			return -ENODEV; /* Create tty cdev instead of serdev */
+
+		if (!strcmp(adev->pnp.unique_id, "2"))
+			*skip = true;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_quirk_skip_serdev_enumeration);
+#endif
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 17f700c9a4f9..88f21780447b 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -622,6 +622,22 @@ static inline bool acpi_device_always_present(struct acpi_device *adev)
 }
 #endif
 
+#if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
+bool acpi_quirk_skip_i2c_client_enumeration(struct acpi_device *adev);
+int acpi_quirk_skip_serdev_enumeration(struct device *controller_parent, bool *skip);
+#else
+static inline bool acpi_quirk_skip_i2c_client_enumeration(struct acpi_device *adev)
+{
+	return false;
+}
+static inline int
+acpi_quirk_skip_serdev_enumeration(struct device *controller_parent, bool *skip)
+{
+	*skip = false;
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_PM
 void acpi_pm_wakeup_event(struct device *dev);
 acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
-- 
cgit v1.2.3


From 8120832d8f82aa7316c578fbccf11e385a5b3601 Mon Sep 17 00:00:00 2001
From: Manfred Spraul <manfred@colorfullife.com>
Date: Wed, 22 Dec 2021 15:09:31 +0100
Subject: ACPI: processor: thermal: avoid cpufreq_get_policy()

cpu_has_cpufreq() stores a 'struct cpufreq_policy' on the stack.
Unfortunately, with debugging options enabled, the structure can be
larger than 1024 bytes, which causes a compiler warning/error.

(actually observed: 1184 bytes).

Therefore: Switch to cpufreq_cpu_get().

Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/processor_thermal.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c
index a3d34e3f9f94..d8b2dfcd59b5 100644
--- a/drivers/acpi/processor_thermal.c
+++ b/drivers/acpi/processor_thermal.c
@@ -53,10 +53,17 @@ static int phys_package_first_cpu(int cpu)
 
 static int cpu_has_cpufreq(unsigned int cpu)
 {
-	struct cpufreq_policy policy;
-	if (!acpi_processor_cpufreq_init || cpufreq_get_policy(&policy, cpu))
+	struct cpufreq_policy *policy;
+
+	if (!acpi_processor_cpufreq_init)
 		return 0;
-	return 1;
+
+	policy = cpufreq_cpu_get(cpu);
+	if (policy) {
+		cpufreq_cpu_put(policy);
+		return 1;
+	}
+	return 0;
 }
 
 static int cpufreq_get_max_state(unsigned int cpu)
-- 
cgit v1.2.3


From 57a18322227134e37b693ef8ef216ed7ce7ba7d6 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Thu, 30 Dec 2021 20:31:19 +0100
Subject: ACPI / x86: Introduce an acpi_quirk_skip_acpi_ac_and_battery() helper

Some x86 ACPI boards have broken AC and battery ACPI devices in their ACPI
tables. This is often tied to these devices using certain PMICs where the
factory OS image seems to be using native charger and fuel-gauge drivers
instead.

So far both the AC and battery drivers have almost identical checks for
these PMICs including both of them having a DMI based mechanism to force
usage of the ACPI AC and battery drivers on some boards even though one
of these PMICs is present, with the same 2 boards listed in both driver's
DMI tables for this.

The only difference is that the AC driver checks for 2 PMICs and the
battery driver only for one. This has grown this way because the other
(Whiskey Cove) PMIC is only used on a few boards (3 known boards) and
although some of these do have non working ACPI battery devices, their
_STA method always returns 0, but that really should not be relied on.

This patch factors out the shared checks into a new
acpi_quirk_skip_acpi_ac_and_battery() helper and moves the AC and
battery drivers over to this new helper.

Note the DMI table is shared with acpi_quirk_skip_i2c_client_enumeration()
and acpi_quirk_skip_serdev_enumeration(), because boards needing DMI quirks
for either of these typically also have broken AC and battery ACPI devices.

The ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY quirk is not set yet on boards
already in this DMI table, to avoid introducing any functional changes
in this refactoring patch.

Besided sharing the code between the AC and battery drivers this
refactoring also moves this quirk handling to under #ifdef CONFIG_X86,
removing this x86 specific code from non x86 ACPI builds.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/ac.c        | 43 ++-------------------------
 drivers/acpi/battery.c   | 42 ++------------------------
 drivers/acpi/x86/utils.c | 77 +++++++++++++++++++++++++++++++++++++++++++++---
 include/acpi/acpi_bus.h  |  5 ++++
 4 files changed, 84 insertions(+), 83 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
index 81aff651a0d4..db487ff9dd1b 100644
--- a/drivers/acpi/ac.c
+++ b/drivers/acpi/ac.c
@@ -48,19 +48,12 @@ static const struct acpi_device_id ac_device_ids[] = {
 };
 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
 
-/* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
-static const struct acpi_ac_bl acpi_ac_blacklist[] = {
-	{ "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
-	{ "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
-};
-
 #ifdef CONFIG_PM_SLEEP
 static int acpi_ac_resume(struct device *dev);
 #endif
 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
 
 static int ac_sleep_before_get_state_ms;
-static int ac_check_pmic = 1;
 static int ac_only;
 
 static struct acpi_driver acpi_ac_driver = {
@@ -200,12 +193,6 @@ static int __init thinkpad_e530_quirk(const struct dmi_system_id *d)
 	return 0;
 }
 
-static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
-{
-	ac_check_pmic = 0;
-	return 0;
-}
-
 static int __init ac_only_quirk(const struct dmi_system_id *d)
 {
 	ac_only = 1;
@@ -214,13 +201,6 @@ static int __init ac_only_quirk(const struct dmi_system_id *d)
 
 /* Please keep this list alphabetically sorted */
 static const struct dmi_system_id ac_dmi_table[]  __initconst = {
-	{
-		/* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
-		.callback = ac_do_not_check_pmic_quirk,
-		.matches = {
-			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
-		},
-	},
 	{
 		/* Kodlix GK45 returning incorrect state */
 		.callback = ac_only_quirk,
@@ -228,15 +208,6 @@ static const struct dmi_system_id ac_dmi_table[]  __initconst = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
 		},
 	},
-	{
-		/* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
-		.callback = ac_do_not_check_pmic_quirk,
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
-			DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
-			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
-		},
-	},
 	{
 		/* Lenovo Thinkpad e530, see comment in acpi_ac_notify() */
 		.callback = thinkpad_e530_quirk,
@@ -341,23 +312,15 @@ static int acpi_ac_remove(struct acpi_device *device)
 
 static int __init acpi_ac_init(void)
 {
-	unsigned int i;
 	int result;
 
 	if (acpi_disabled)
 		return -ENODEV;
 
-	dmi_check_system(ac_dmi_table);
+	if (acpi_quirk_skip_acpi_ac_and_battery())
+		return -ENODEV;
 
-	if (ac_check_pmic) {
-		for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
-			if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
-					     acpi_ac_blacklist[i].hrv)) {
-				pr_info("found native %s PMIC, not loading\n",
-					acpi_ac_blacklist[i].hid);
-				return -ENODEV;
-			}
-	}
+	dmi_check_system(ac_dmi_table);
 
 	result = acpi_bus_register_driver(&acpi_ac_driver);
 	if (result < 0)
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 8afa85d6eb6a..bf4b7f0b627a 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -52,7 +52,6 @@ static bool battery_driver_registered;
 static int battery_bix_broken_package;
 static int battery_notification_delay_ms;
 static int battery_ac_is_broken;
-static int battery_check_pmic = 1;
 static unsigned int cache_time = 1000;
 module_param(cache_time, uint, 0644);
 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
@@ -64,11 +63,6 @@ static const struct acpi_device_id battery_device_ids[] = {
 
 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
 
-/* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
-static const char * const acpi_battery_blacklist[] = {
-	"INT33F4", /* X-Powers AXP288 PMIC */
-};
-
 enum {
 	ACPI_BATTERY_ALARM_PRESENT,
 	ACPI_BATTERY_XINFO_PRESENT,
@@ -1104,13 +1098,6 @@ battery_ac_is_broken_quirk(const struct dmi_system_id *d)
 	return 0;
 }
 
-static int __init
-battery_do_not_check_pmic_quirk(const struct dmi_system_id *d)
-{
-	battery_check_pmic = 0;
-	return 0;
-}
-
 static const struct dmi_system_id bat_dmi_table[] __initconst = {
 	{
 		/* NEC LZ750/LS */
@@ -1139,22 +1126,6 @@ static const struct dmi_system_id bat_dmi_table[] __initconst = {
 			DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
 		},
 	},
-	{
-		/* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
-		.callback = battery_do_not_check_pmic_quirk,
-		.matches = {
-			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
-		},
-	},
-	{
-		/* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
-		.callback = battery_do_not_check_pmic_quirk,
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
-			DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
-			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
-		},
-	},
 	{},
 };
 
@@ -1279,19 +1250,12 @@ static struct acpi_driver acpi_battery_driver = {
 
 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
 {
-	unsigned int i;
 	int result;
 
-	dmi_check_system(bat_dmi_table);
+	if (acpi_quirk_skip_acpi_ac_and_battery())
+		return;
 
-	if (battery_check_pmic) {
-		for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++)
-			if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) {
-				pr_info("found native %s PMIC, not loading\n",
-					acpi_battery_blacklist[i]);
-				return;
-			}
-	}
+	dmi_check_system(bat_dmi_table);
 
 	result = acpi_bus_register_driver(&acpi_battery_driver);
 	battery_driver_registered = (result == 0);
diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index 375a0911f06d..5411f2f1254e 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -8,6 +8,8 @@
  * Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
  */
 
+#define pr_fmt(fmt) "ACPI: " fmt
+
 #include <linux/acpi.h>
 #include <linux/dmi.h>
 #include <linux/platform_device.h>
@@ -210,7 +212,6 @@ bool force_storage_d3(void)
 	return x86_match_cpu(storage_d3_cpu_ids);
 }
 
-#if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
 /*
  * x86 ACPI boards which ship with only Android as their factory image usually
  * declare a whole bunch of bogus I2C devices in their ACPI tables and sometimes
@@ -236,8 +237,36 @@ bool force_storage_d3(void)
  */
 #define ACPI_QUIRK_SKIP_I2C_CLIENTS				BIT(0)
 #define ACPI_QUIRK_UART1_TTY_UART2_SKIP				BIT(1)
+#define ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY			BIT(2)
+#define ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY			BIT(3)
+
+static const struct dmi_system_id acpi_quirk_skip_dmi_ids[] = {
+	/*
+	 * 1. Devices with only the skip / don't-skip AC and battery quirks,
+	 *    sorted alphabetically.
+	 */
+	{
+		/* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
+		.matches = {
+			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
+		},
+		.driver_data = (void *)ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY
+	},
+	{
+		/* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
+		},
+		.driver_data = (void *)ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY
+	},
 
-static const struct dmi_system_id acpi_skip_serial_bus_enumeration_ids[] = {
+	/*
+	 * 2. Devices which also have the skip i2c/serdev quirks and which
+	 *    need the x86-android-tablets module to properly work.
+	 */
+#if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
 	{
 		.matches = {
 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
@@ -263,9 +292,11 @@ static const struct dmi_system_id acpi_skip_serial_bus_enumeration_ids[] = {
 		},
 		.driver_data = (void *)ACPI_QUIRK_SKIP_I2C_CLIENTS,
 	},
+#endif
 	{}
 };
 
+#if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
 static const struct acpi_device_id i2c_acpi_known_good_ids[] = {
 	{ "10EC5640", 0 }, /* RealTek ALC5640 audio codec */
 	{ "INT33F4", 0 },  /* X-Powers AXP288 PMIC */
@@ -279,7 +310,7 @@ bool acpi_quirk_skip_i2c_client_enumeration(struct acpi_device *adev)
 	const struct dmi_system_id *dmi_id;
 	long quirks;
 
-	dmi_id = dmi_first_match(acpi_skip_serial_bus_enumeration_ids);
+	dmi_id = dmi_first_match(acpi_quirk_skip_dmi_ids);
 	if (!dmi_id)
 		return false;
 
@@ -303,7 +334,7 @@ int acpi_quirk_skip_serdev_enumeration(struct device *controller_parent, bool *s
 	if (!adev || !adev->pnp.unique_id || !dev_is_platform(controller_parent))
 		return 0;
 
-	dmi_id = dmi_first_match(acpi_skip_serial_bus_enumeration_ids);
+	dmi_id = dmi_first_match(acpi_quirk_skip_dmi_ids);
 	if (dmi_id)
 		quirks = (unsigned long)dmi_id->driver_data;
 
@@ -319,3 +350,41 @@ int acpi_quirk_skip_serdev_enumeration(struct device *controller_parent, bool *s
 }
 EXPORT_SYMBOL_GPL(acpi_quirk_skip_serdev_enumeration);
 #endif
+
+/* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
+static const struct {
+	const char *hid;
+	int hrv;
+} acpi_skip_ac_and_battery_pmic_ids[] = {
+	{ "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
+	{ "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
+};
+
+bool acpi_quirk_skip_acpi_ac_and_battery(void)
+{
+	const struct dmi_system_id *dmi_id;
+	long quirks = 0;
+	int i;
+
+	dmi_id = dmi_first_match(acpi_quirk_skip_dmi_ids);
+	if (dmi_id)
+		quirks = (unsigned long)dmi_id->driver_data;
+
+	if (quirks & ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY)
+		return true;
+
+	if (quirks & ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY)
+		return false;
+
+	for (i = 0; i < ARRAY_SIZE(acpi_skip_ac_and_battery_pmic_ids); i++) {
+		if (acpi_dev_present(acpi_skip_ac_and_battery_pmic_ids[i].hid, "1",
+				     acpi_skip_ac_and_battery_pmic_ids[i].hrv)) {
+			pr_info_once("found native %s PMIC, skipping ACPI AC and battery devices\n",
+				     acpi_skip_ac_and_battery_pmic_ids[i].hid);
+			return true;
+		}
+	}
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(acpi_quirk_skip_acpi_ac_and_battery);
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 80c425bc98a7..04b9ace9689b 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -615,12 +615,17 @@ int acpi_disable_wakeup_device_power(struct acpi_device *dev);
 
 #ifdef CONFIG_X86
 bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *status);
+bool acpi_quirk_skip_acpi_ac_and_battery(void);
 #else
 static inline bool acpi_device_override_status(struct acpi_device *adev,
 					       unsigned long long *status)
 {
 	return false;
 }
+static inline bool acpi_quirk_skip_acpi_ac_and_battery(void)
+{
+	return false;
+}
 #endif
 
 #if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
-- 
cgit v1.2.3


From 1b15b69800e2f9320b3d1fc0611c177c70c24424 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Thu, 30 Dec 2021 20:31:20 +0100
Subject: ACPI / x86: Skip AC and battery devices on x86 Android tablets with
 broken DSDTs

So far all of the tablets for which the skip i2c-client/serdev enumeration
quirks have been added also all have broken ACPI AC / battery devices
extend the existing quirks for these tablets to also skip the broken
AC / battery devices.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/x86/utils.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/x86/utils.c b/drivers/acpi/x86/utils.c
index 5411f2f1254e..ffdeed5334d6 100644
--- a/drivers/acpi/x86/utils.c
+++ b/drivers/acpi/x86/utils.c
@@ -273,14 +273,16 @@ static const struct dmi_system_id acpi_quirk_skip_dmi_ids[] = {
 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "ME176C"),
 		},
 		.driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
-					ACPI_QUIRK_UART1_TTY_UART2_SKIP),
+					ACPI_QUIRK_UART1_TTY_UART2_SKIP |
+					ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY),
 	},
 	{
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 			DMI_MATCH(DMI_PRODUCT_NAME, "TF103C"),
 		},
-		.driver_data = (void *)ACPI_QUIRK_SKIP_I2C_CLIENTS,
+		.driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
+					ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY),
 	},
 	{
 		/* Whitelabel (sold as various brands) TM800A550L */
@@ -290,7 +292,8 @@ static const struct dmi_system_id acpi_quirk_skip_dmi_ids[] = {
 			/* Above strings are too generic, also match on BIOS version */
 			DMI_MATCH(DMI_BIOS_VERSION, "ZY-8-BI-PX4S70VTR400-X423B-005-D"),
 		},
-		.driver_data = (void *)ACPI_QUIRK_SKIP_I2C_CLIENTS,
+		.driver_data = (void *)(ACPI_QUIRK_SKIP_I2C_CLIENTS |
+					ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY),
 	},
 #endif
 	{}
-- 
cgit v1.2.3


From 77e2a04745ff8e391ad402e2d2d1157a5d3a7ebc Mon Sep 17 00:00:00 2001
From: Sudeep Holla <sudeep.holla@arm.com>
Date: Tue, 4 Jan 2022 19:51:08 +0000
Subject: ACPI: PCC: Implement OperationRegion handler for the PCC Type 3
 subtype

PCC OpRegion provides a mechanism to communicate with the platform
directly from the AML. PCCT provides the list of PCC channel available
in the platform, a subset or all of them can be used in PCC Opregion.

This patch registers the PCC OpRegion handler before ACPI tables are
loaded. This relies on the special context data passed to identify and
set up the PCC channel before the OpRegion handler is executed for the
first time.

Typical PCC Opregion declaration looks like this:

OperationRegion (PFRM, PCC, 2, 0x74)
Field (PFRM, ByteAcc, NoLock, Preserve)
{
    SIGN,   32,
    FLGS,   32,
    LEN,    32,
    CMD,    32,
    DATA,   800
}

It contains four named double words followed by 100 bytes of buffer
names DATA.

ASL can fill out the buffer something like:

    /* Create global or local buffer */
    Name (BUFF, Buffer (0x0C){})
    /* Create double word fields over the buffer */
    CreateDWordField (BUFF, 0x0, WD0)
    CreateDWordField (BUFF, 0x04, WD1)
    CreateDWordField (BUFF, 0x08, WD2)

    /* Fill the named fields */
    WD0 = 0x50434300
    SIGN = BUFF
    WD0 = 1
    FLGS = BUFF
    WD0 = 0x10
    LEN = BUFF

    /* Fill the payload in the DATA buffer */
    WD0 = 0
    WD1 = 0x08
    WD2 = 0
    DATA = BUFF

    /* Write to CMD field to trigger handler */
    WD0 = 0x4404
    CMD = BUFF

This buffer is received by acpi_pcc_opregion_space_handler. This
handler will fetch the complete buffer via internal_pcc_buffer.

The setup handler will receive the special PCC context data which will
contain the PCC channel index which used to set up the channel. The
buffer pointer and length is saved in region context which is then used
in the handler.

(kernel test robot: Build failure with CONFIG_ACPI_DEBUGGER)
Link: https://lore.kernel.org/r/202201041539.feAV0l27-lkp@intel.com
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/acpi/Kconfig    |  17 +++++++
 drivers/acpi/Makefile   |   1 +
 drivers/acpi/acpi_pcc.c | 120 ++++++++++++++++++++++++++++++++++++++++++++++++
 drivers/acpi/bus.c      |   1 +
 include/linux/acpi.h    |   6 +++
 5 files changed, 145 insertions(+)
 create mode 100644 drivers/acpi/acpi_pcc.c

(limited to 'drivers/acpi')

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index cdbdf68bd98f..60b5424bd318 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -524,6 +524,23 @@ config ACPI_PPTT
 	bool
 endif
 
+config ACPI_PCC
+	bool "ACPI PCC Address Space"
+	depends on PCC
+	default y
+	help
+	  The PCC Address Space also referred as PCC Operation Region pertains
+	  to the region of PCC subspace that succeeds the PCC signature.
+
+	  The PCC Operation Region works in conjunction with the PCC Table
+	  (Platform Communications Channel Table). PCC subspaces that are
+	  marked for use as PCC Operation Regions must not be used as PCC
+	  subspaces for the standard ACPI features such as CPPC, RASF, PDTT and
+	  MPST. These standard features must always use the PCC Table instead.
+
+	  Enable this feature if you want to set up and install the PCC Address
+	  Space handler to handle PCC OpRegion in the firmware.
+
 source "drivers/acpi/pmic/Kconfig"
 
 config ACPI_VIOT
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 3018714e87d9..08c2d985c57c 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -67,6 +67,7 @@ acpi-$(CONFIG_ACPI_LPIT)	+= acpi_lpit.o
 acpi-$(CONFIG_ACPI_GENERIC_GSI) += irq.o
 acpi-$(CONFIG_ACPI_WATCHDOG)	+= acpi_watchdog.o
 acpi-$(CONFIG_ACPI_PRMT)	+= prmt.o
+acpi-$(CONFIG_ACPI_PCC)		+= acpi_pcc.o
 
 # Address translation
 acpi-$(CONFIG_ACPI_ADXL)	+= acpi_adxl.o
diff --git a/drivers/acpi/acpi_pcc.c b/drivers/acpi/acpi_pcc.c
new file mode 100644
index 000000000000..41e3ebd204ff
--- /dev/null
+++ b/drivers/acpi/acpi_pcc.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Author: Sudeep Holla <sudeep.holla@arm.com>
+ * Copyright 2021 Arm Limited
+ *
+ * The PCC Address Space also referred as PCC Operation Region pertains to the
+ * region of PCC subspace that succeeds the PCC signature. The PCC Operation
+ * Region works in conjunction with the PCC Table(Platform Communications
+ * Channel Table). PCC subspaces that are marked for use as PCC Operation
+ * Regions must not be used as PCC subspaces for the standard ACPI features
+ * such as CPPC, RASF, PDTT and MPST. These standard features must always use
+ * the PCC Table instead.
+ *
+ * This driver sets up the PCC Address Space and installs an handler to enable
+ * handling of PCC OpRegion in the firmware.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/acpi.h>
+#include <linux/completion.h>
+#include <linux/idr.h>
+#include <linux/io.h>
+
+#include <acpi/pcc.h>
+
+struct pcc_data {
+	struct pcc_mbox_chan *pcc_chan;
+	void __iomem *pcc_comm_addr;
+	struct completion done;
+	struct mbox_client cl;
+	struct acpi_pcc_info ctx;
+};
+
+struct acpi_pcc_info pcc_ctx;
+
+static void pcc_rx_callback(struct mbox_client *cl, void *m)
+{
+	struct pcc_data *data = container_of(cl, struct pcc_data, cl);
+
+	complete(&data->done);
+}
+
+static acpi_status
+acpi_pcc_address_space_setup(acpi_handle region_handle, u32 function,
+			     void *handler_context,  void **region_context)
+{
+	struct pcc_data *data;
+	struct acpi_pcc_info *ctx = handler_context;
+	struct pcc_mbox_chan *pcc_chan;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return AE_NO_MEMORY;
+
+	data->cl.rx_callback = pcc_rx_callback;
+	data->cl.knows_txdone = true;
+	data->ctx.length = ctx->length;
+	data->ctx.subspace_id = ctx->subspace_id;
+	data->ctx.internal_buffer = ctx->internal_buffer;
+
+	init_completion(&data->done);
+	data->pcc_chan = pcc_mbox_request_channel(&data->cl, ctx->subspace_id);
+	if (IS_ERR(data->pcc_chan)) {
+		pr_err("Failed to find PCC channel for subspace %d\n",
+		       ctx->subspace_id);
+		return AE_NOT_FOUND;
+	}
+
+	pcc_chan = data->pcc_chan;
+	data->pcc_comm_addr = acpi_os_ioremap(pcc_chan->shmem_base_addr,
+					      pcc_chan->shmem_size);
+	if (!data->pcc_comm_addr) {
+		pr_err("Failed to ioremap PCC comm region mem for %d\n",
+		       ctx->subspace_id);
+		return AE_NO_MEMORY;
+	}
+
+	*region_context = data;
+	return AE_OK;
+}
+
+static acpi_status
+acpi_pcc_address_space_handler(u32 function, acpi_physical_address addr,
+			       u32 bits, acpi_integer *value,
+			       void *handler_context, void *region_context)
+{
+	int ret;
+	struct pcc_data *data = region_context;
+
+	reinit_completion(&data->done);
+
+	/* Write to Shared Memory */
+	memcpy_toio(data->pcc_comm_addr, (void *)value, data->ctx.length);
+
+	ret = mbox_send_message(data->pcc_chan->mchan, NULL);
+	if (ret < 0)
+		return AE_ERROR;
+
+	if (data->pcc_chan->mchan->mbox->txdone_irq)
+		wait_for_completion(&data->done);
+
+	mbox_client_txdone(data->pcc_chan->mchan, ret);
+
+	memcpy_fromio(value, data->pcc_comm_addr, data->ctx.length);
+
+	return AE_OK;
+}
+
+void __init acpi_init_pcc(void)
+{
+	acpi_status status;
+
+	status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
+						    ACPI_ADR_SPACE_PLATFORM_COMM,
+						    &acpi_pcc_address_space_handler,
+						    &acpi_pcc_address_space_setup,
+						    &pcc_ctx);
+	if (ACPI_FAILURE(status))
+		pr_alert("OperationRegion handler could not be installed\n");
+}
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index fa923a929224..b64014b4203e 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -1320,6 +1320,7 @@ static int __init acpi_init(void)
 		pr_debug("%s: kset create error\n", __func__);
 
 	init_prmt();
+	acpi_init_pcc();
 	result = acpi_bus_init();
 	if (result) {
 		kobject_put(acpi_kobj);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index b28f8790192a..93eaba2485e3 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1389,6 +1389,12 @@ static inline int find_acpi_cpu_cache_topology(unsigned int cpu, int level)
 }
 #endif
 
+#ifdef CONFIG_ACPI_PCC
+void acpi_init_pcc(void);
+#else
+static inline void acpi_init_pcc(void) { }
+#endif
+
 #ifdef CONFIG_ACPI
 extern void acpi_device_notify(struct device *dev);
 extern void acpi_device_notify_remove(struct device *dev);
-- 
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