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-rw-r--r--drivers/xen/Kconfig12
-rw-r--r--drivers/xen/Makefile1
-rw-r--r--drivers/xen/pcpu.c35
-rw-r--r--drivers/xen/xen-acpi-cpuhotplug.c471
-rw-r--r--include/xen/acpi.h3
-rw-r--r--include/xen/interface/platform.h8
6 files changed, 530 insertions, 0 deletions
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index dcffad1b47ca..5a32232cf7c1 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -202,6 +202,18 @@ config XEN_ACPI_HOTPLUG_MEMORY
to hot-add memory at runtime (the hot-added memory cannot be
removed until machine stop), select Y/M here, otherwise select N.
+config XEN_ACPI_HOTPLUG_CPU
+ tristate "Xen ACPI cpu hotplug"
+ depends on XEN_DOM0 && XEN_STUB && ACPI
+ select ACPI_CONTAINER
+ default n
+ help
+ Xen ACPI cpu enumerating and hotplugging
+
+ For hotplugging, currently Xen only support ACPI cpu hotadd.
+ If you want to hotadd cpu at runtime (the hotadded cpu cannot
+ be removed until machine stop), select Y/M here.
+
config XEN_ACPI_PROCESSOR
tristate "Xen ACPI processor"
depends on XEN && X86 && ACPI_PROCESSOR && CPU_FREQ
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 1605f594ff56..eabd0ee1c2bc 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_XEN_PCIDEV_BACKEND) += xen-pciback/
obj-$(CONFIG_XEN_PRIVCMD) += xen-privcmd.o
obj-$(CONFIG_XEN_STUB) += xen-stub.o
obj-$(CONFIG_XEN_ACPI_HOTPLUG_MEMORY) += xen-acpi-memhotplug.o
+obj-$(CONFIG_XEN_ACPI_HOTPLUG_CPU) += xen-acpi-cpuhotplug.o
obj-$(CONFIG_XEN_ACPI_PROCESSOR) += xen-acpi-processor.o
xen-evtchn-y := evtchn.o
xen-gntdev-y := gntdev.o
diff --git a/drivers/xen/pcpu.c b/drivers/xen/pcpu.c
index 067fcfa1723e..0836a18675b1 100644
--- a/drivers/xen/pcpu.c
+++ b/drivers/xen/pcpu.c
@@ -333,6 +333,41 @@ static irqreturn_t xen_pcpu_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
+/* Sync with Xen hypervisor after cpu hotadded */
+void xen_pcpu_hotplug_sync(void)
+{
+ schedule_work(&xen_pcpu_work);
+}
+EXPORT_SYMBOL_GPL(xen_pcpu_hotplug_sync);
+
+/*
+ * For hypervisor presented cpu, return logic cpu id;
+ * For hypervisor non-presented cpu, return -ENODEV.
+ */
+int xen_pcpu_id(uint32_t acpi_id)
+{
+ int cpu_id = 0, max_id = 0;
+ struct xen_platform_op op;
+
+ op.cmd = XENPF_get_cpuinfo;
+ while (cpu_id <= max_id) {
+ op.u.pcpu_info.xen_cpuid = cpu_id;
+ if (HYPERVISOR_dom0_op(&op)) {
+ cpu_id++;
+ continue;
+ }
+
+ if (acpi_id == op.u.pcpu_info.acpi_id)
+ return cpu_id;
+ if (op.u.pcpu_info.max_present > max_id)
+ max_id = op.u.pcpu_info.max_present;
+ cpu_id++;
+ }
+
+ return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(xen_pcpu_id);
+
static int __init xen_pcpu_init(void)
{
int irq, ret;
diff --git a/drivers/xen/xen-acpi-cpuhotplug.c b/drivers/xen/xen-acpi-cpuhotplug.c
new file mode 100644
index 000000000000..9eefbb0f79a3
--- /dev/null
+++ b/drivers/xen/xen-acpi-cpuhotplug.c
@@ -0,0 +1,471 @@
+/*
+ * Copyright (C) 2012 Intel Corporation
+ * Author: Liu Jinsong <jinsong.liu@intel.com>
+ * Author: Jiang Yunhong <yunhong.jiang@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for more
+ * details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/cpu.h>
+#include <linux/acpi.h>
+#include <linux/uaccess.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/processor.h>
+
+#include <xen/acpi.h>
+#include <xen/interface/platform.h>
+#include <asm/xen/hypercall.h>
+
+#define PREFIX "ACPI:xen_cpu_hotplug:"
+
+#define INSTALL_NOTIFY_HANDLER 0
+#define UNINSTALL_NOTIFY_HANDLER 1
+
+static acpi_status xen_acpi_cpu_hotadd(struct acpi_processor *pr);
+
+/* --------------------------------------------------------------------------
+ Driver Interface
+-------------------------------------------------------------------------- */
+
+static int xen_acpi_processor_enable(struct acpi_device *device)
+{
+ acpi_status status = 0;
+ unsigned long long value;
+ union acpi_object object = { 0 };
+ struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
+ struct acpi_processor *pr;
+
+ pr = acpi_driver_data(device);
+ if (!pr) {
+ pr_err(PREFIX "Cannot find driver data\n");
+ return -EINVAL;
+ }
+
+ if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
+ /* Declared with "Processor" statement; match ProcessorID */
+ status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
+ if (ACPI_FAILURE(status)) {
+ pr_err(PREFIX "Evaluating processor object\n");
+ return -ENODEV;
+ }
+
+ pr->acpi_id = object.processor.proc_id;
+ } else {
+ /* Declared with "Device" statement; match _UID */
+ status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
+ NULL, &value);
+ if (ACPI_FAILURE(status)) {
+ pr_err(PREFIX "Evaluating processor _UID\n");
+ return -ENODEV;
+ }
+
+ pr->acpi_id = value;
+ }
+
+ pr->id = xen_pcpu_id(pr->acpi_id);
+
+ if ((int)pr->id < 0)
+ /* This cpu is not presented at hypervisor, try to hotadd it */
+ if (ACPI_FAILURE(xen_acpi_cpu_hotadd(pr))) {
+ pr_err(PREFIX "Hotadd CPU (acpi_id = %d) failed.\n",
+ pr->acpi_id);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int __cpuinit xen_acpi_processor_add(struct acpi_device *device)
+{
+ int ret;
+ struct acpi_processor *pr;
+
+ if (!device)
+ return -EINVAL;
+
+ pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
+ if (!pr)
+ return -ENOMEM;
+
+ pr->handle = device->handle;
+ strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
+ strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
+ device->driver_data = pr;
+
+ ret = xen_acpi_processor_enable(device);
+ if (ret)
+ pr_err(PREFIX "Error when enabling Xen processor\n");
+
+ return ret;
+}
+
+static int xen_acpi_processor_remove(struct acpi_device *device, int type)
+{
+ struct acpi_processor *pr;
+
+ if (!device)
+ return -EINVAL;
+
+ pr = acpi_driver_data(device);
+ if (!pr)
+ return -EINVAL;
+
+ kfree(pr);
+ return 0;
+}
+
+/*--------------------------------------------------------------
+ Acpi processor hotplug support
+--------------------------------------------------------------*/
+
+static int is_processor_present(acpi_handle handle)
+{
+ acpi_status status;
+ unsigned long long sta = 0;
+
+
+ status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+
+ if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
+ return 1;
+
+ /*
+ * _STA is mandatory for a processor that supports hot plug
+ */
+ if (status == AE_NOT_FOUND)
+ pr_info(PREFIX "Processor does not support hot plug\n");
+ else
+ pr_info(PREFIX "Processor Device is not present");
+ return 0;
+}
+
+static int xen_apic_id(acpi_handle handle)
+{
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+ struct acpi_madt_local_apic *lapic;
+ int apic_id;
+
+ if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
+ return -EINVAL;
+
+ if (!buffer.length || !buffer.pointer)
+ return -EINVAL;
+
+ obj = buffer.pointer;
+ if (obj->type != ACPI_TYPE_BUFFER ||
+ obj->buffer.length < sizeof(*lapic)) {
+ kfree(buffer.pointer);
+ return -EINVAL;
+ }
+
+ lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;
+
+ if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||
+ !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {
+ kfree(buffer.pointer);
+ return -EINVAL;
+ }
+
+ apic_id = (uint32_t)lapic->id;
+ kfree(buffer.pointer);
+ buffer.length = ACPI_ALLOCATE_BUFFER;
+ buffer.pointer = NULL;
+
+ return apic_id;
+}
+
+static int xen_hotadd_cpu(struct acpi_processor *pr)
+{
+ int cpu_id, apic_id, pxm;
+ struct xen_platform_op op;
+
+ apic_id = xen_apic_id(pr->handle);
+ if (apic_id < 0) {
+ pr_err(PREFIX "Failed to get apic_id for acpi_id %d\n",
+ pr->acpi_id);
+ return -ENODEV;
+ }
+
+ pxm = xen_acpi_get_pxm(pr->handle);
+ if (pxm < 0) {
+ pr_err(PREFIX "Failed to get _PXM for acpi_id %d\n",
+ pr->acpi_id);
+ return pxm;
+ }
+
+ op.cmd = XENPF_cpu_hotadd;
+ op.u.cpu_add.apic_id = apic_id;
+ op.u.cpu_add.acpi_id = pr->acpi_id;
+ op.u.cpu_add.pxm = pxm;
+
+ cpu_id = HYPERVISOR_dom0_op(&op);
+ if (cpu_id < 0)
+ pr_err(PREFIX "Failed to hotadd CPU for acpi_id %d\n",
+ pr->acpi_id);
+
+ return cpu_id;
+}
+
+static acpi_status xen_acpi_cpu_hotadd(struct acpi_processor *pr)
+{
+ if (!is_processor_present(pr->handle))
+ return AE_ERROR;
+
+ pr->id = xen_hotadd_cpu(pr);
+ if ((int)pr->id < 0)
+ return AE_ERROR;
+
+ /*
+ * Sync with Xen hypervisor, providing new /sys/.../xen_cpuX
+ * interface after cpu hotadded.
+ */
+ xen_pcpu_hotplug_sync();
+
+ return AE_OK;
+}
+
+static
+int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
+{
+ acpi_handle phandle;
+ struct acpi_device *pdev;
+
+ if (acpi_get_parent(handle, &phandle))
+ return -ENODEV;
+
+ if (acpi_bus_get_device(phandle, &pdev))
+ return -ENODEV;
+
+ if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR))
+ return -ENODEV;
+
+ return 0;
+}
+
+static int acpi_processor_device_remove(struct acpi_device *device)
+{
+ pr_debug(PREFIX "Xen does not support CPU hotremove\n");
+
+ return -ENOSYS;
+}
+
+static void acpi_processor_hotplug_notify(acpi_handle handle,
+ u32 event, void *data)
+{
+ struct acpi_processor *pr;
+ struct acpi_device *device = NULL;
+ u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
+ int result;
+
+ switch (event) {
+ case ACPI_NOTIFY_BUS_CHECK:
+ case ACPI_NOTIFY_DEVICE_CHECK:
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Processor driver received %s event\n",
+ (event == ACPI_NOTIFY_BUS_CHECK) ?
+ "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
+
+ if (!is_processor_present(handle))
+ break;
+
+ if (!acpi_bus_get_device(handle, &device))
+ break;
+
+ result = acpi_processor_device_add(handle, &device);
+ if (result) {
+ pr_err(PREFIX "Unable to add the device\n");
+ break;
+ }
+
+ ost_code = ACPI_OST_SC_SUCCESS;
+ break;
+
+ case ACPI_NOTIFY_EJECT_REQUEST:
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "received ACPI_NOTIFY_EJECT_REQUEST\n"));
+
+ if (acpi_bus_get_device(handle, &device)) {
+ pr_err(PREFIX "Device don't exist, dropping EJECT\n");
+ break;
+ }
+ pr = acpi_driver_data(device);
+ if (!pr) {
+ pr_err(PREFIX "Driver data is NULL, dropping EJECT\n");
+ break;
+ }
+
+ /*
+ * TBD: implement acpi_processor_device_remove if Xen support
+ * CPU hotremove in the future.
+ */
+ acpi_processor_device_remove(device);
+ break;
+
+ default:
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Unsupported event [0x%x]\n", event));
+
+ /* non-hotplug event; possibly handled by other handler */
+ return;
+ }
+
+ (void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
+ return;
+}
+
+static acpi_status is_processor_device(acpi_handle handle)
+{
+ struct acpi_device_info *info;
+ char *hid;
+ acpi_status status;
+
+ status = acpi_get_object_info(handle, &info);
+ if (ACPI_FAILURE(status))
+ return status;
+
+ if (info->type == ACPI_TYPE_PROCESSOR) {
+ kfree(info);
+ return AE_OK; /* found a processor object */
+ }
+
+ if (!(info->valid & ACPI_VALID_HID)) {
+ kfree(info);
+ return AE_ERROR;
+ }
+
+ hid = info->hardware_id.string;
+ if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) {
+ kfree(info);
+ return AE_ERROR;
+ }
+
+ kfree(info);
+ return AE_OK; /* found a processor device object */
+}
+
+static acpi_status
+processor_walk_namespace_cb(acpi_handle handle,
+ u32 lvl, void *context, void **rv)
+{
+ acpi_status status;
+ int *action = context;
+
+ status = is_processor_device(handle);
+ if (ACPI_FAILURE(status))
+ return AE_OK; /* not a processor; continue to walk */
+
+ switch (*action) {
+ case INSTALL_NOTIFY_HANDLER:
+ acpi_install_notify_handler(handle,
+ ACPI_SYSTEM_NOTIFY,
+ acpi_processor_hotplug_notify,
+ NULL);
+ break;
+ case UNINSTALL_NOTIFY_HANDLER:
+ acpi_remove_notify_handler(handle,
+ ACPI_SYSTEM_NOTIFY,
+ acpi_processor_hotplug_notify);
+ break;
+ default:
+ break;
+ }
+
+ /* found a processor; skip walking underneath */
+ return AE_CTRL_DEPTH;
+}
+
+static
+void acpi_processor_install_hotplug_notify(void)
+{
+ int action = INSTALL_NOTIFY_HANDLER;
+ acpi_walk_namespace(ACPI_TYPE_ANY,
+ ACPI_ROOT_OBJECT,
+ ACPI_UINT32_MAX,
+ processor_walk_namespace_cb, NULL, &action, NULL);
+}
+
+static
+void acpi_processor_uninstall_hotplug_notify(void)
+{
+ int action = UNINSTALL_NOTIFY_HANDLER;
+ acpi_walk_namespace(ACPI_TYPE_ANY,
+ ACPI_ROOT_OBJECT,
+ ACPI_UINT32_MAX,
+ processor_walk_namespace_cb, NULL, &action, NULL);
+}
+
+static const struct acpi_device_id processor_device_ids[] = {
+ {ACPI_PROCESSOR_OBJECT_HID, 0},
+ {ACPI_PROCESSOR_DEVICE_HID, 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, processor_device_ids);
+
+static struct acpi_driver xen_acpi_processor_driver = {
+ .name = "processor",
+ .class = ACPI_PROCESSOR_CLASS,
+ .ids = processor_device_ids,
+ .ops = {
+ .add = xen_acpi_processor_add,
+ .remove = xen_acpi_processor_remove,
+ },
+};
+
+static int __init xen_acpi_processor_init(void)
+{
+ int result = 0;
+
+ if (!xen_initial_domain())
+ return -ENODEV;
+
+ /* unregister the stub which only used to reserve driver space */
+ xen_stub_processor_exit();
+
+ result = acpi_bus_register_driver(&xen_acpi_processor_driver);
+ if (result < 0) {
+ xen_stub_processor_init();
+ return result;
+ }
+
+ acpi_processor_install_hotplug_notify();
+ return 0;
+}
+
+static void __exit xen_acpi_processor_exit(void)
+{
+ if (!xen_initial_domain())
+ return;
+
+ acpi_processor_uninstall_hotplug_notify();
+
+ acpi_bus_unregister_driver(&xen_acpi_processor_driver);
+
+ /*
+ * stub reserve space again to prevent any chance of native
+ * driver loading.
+ */
+ xen_stub_processor_init();
+ return;
+}
+
+module_init(xen_acpi_processor_init);
+module_exit(xen_acpi_processor_exit);
+ACPI_MODULE_NAME("xen-acpi-cpuhotplug");
+MODULE_AUTHOR("Liu Jinsong <jinsong.liu@intel.com>");
+MODULE_DESCRIPTION("Xen Hotplug CPU Driver");
+MODULE_LICENSE("GPL");
diff --git a/include/xen/acpi.h b/include/xen/acpi.h
index dc69c91605b8..c962d5f5b38b 100644
--- a/include/xen/acpi.h
+++ b/include/xen/acpi.h
@@ -54,6 +54,9 @@ void xen_stub_memory_device_exit(void);
int xen_stub_processor_init(void);
void xen_stub_processor_exit(void);
+void xen_pcpu_hotplug_sync(void);
+int xen_pcpu_id(uint32_t acpi_id);
+
int xen_acpi_notify_hypervisor_state(u8 sleep_state,
u32 pm1a_cnt, u32 pm1b_cnd);
diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
index 2c4fb4bb07df..c57d5f67f702 100644
--- a/include/xen/interface/platform.h
+++ b/include/xen/interface/platform.h
@@ -324,6 +324,13 @@ struct xenpf_cpu_ol {
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_cpu_ol);
+#define XENPF_cpu_hotadd 58
+struct xenpf_cpu_hotadd {
+ uint32_t apic_id;
+ uint32_t acpi_id;
+ uint32_t pxm;
+};
+
#define XENPF_mem_hotadd 59
struct xenpf_mem_hotadd {
uint64_t spfn;
@@ -361,6 +368,7 @@ struct xen_platform_op {
struct xenpf_set_processor_pminfo set_pminfo;
struct xenpf_pcpuinfo pcpu_info;
struct xenpf_cpu_ol cpu_ol;
+ struct xenpf_cpu_hotadd cpu_add;
struct xenpf_mem_hotadd mem_add;
struct xenpf_core_parking core_parking;
uint8_t pad[128];