summaryrefslogtreecommitdiffstats
path: root/drivers/pci
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pci.c53
-rw-r--r--drivers/pci/pcie/aer.c9
-rw-r--r--drivers/pci/probe.c57
3 files changed, 96 insertions, 23 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index c9d8e3c837de..13d65991c77b 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1233,7 +1233,6 @@ static void pci_restore_pcie_state(struct pci_dev *dev)
pcie_capability_write_word(dev, PCI_EXP_SLTCTL2, cap[i++]);
}
-
static int pci_save_pcix_state(struct pci_dev *dev)
{
int pos;
@@ -1270,6 +1269,45 @@ static void pci_restore_pcix_state(struct pci_dev *dev)
pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
}
+static void pci_save_ltr_state(struct pci_dev *dev)
+{
+ int ltr;
+ struct pci_cap_saved_state *save_state;
+ u16 *cap;
+
+ if (!pci_is_pcie(dev))
+ return;
+
+ ltr = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_LTR);
+ if (!ltr)
+ return;
+
+ save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_LTR);
+ if (!save_state) {
+ pci_err(dev, "no suspend buffer for LTR; ASPM issues possible after resume\n");
+ return;
+ }
+
+ cap = (u16 *)&save_state->cap.data[0];
+ pci_read_config_word(dev, ltr + PCI_LTR_MAX_SNOOP_LAT, cap++);
+ pci_read_config_word(dev, ltr + PCI_LTR_MAX_NOSNOOP_LAT, cap++);
+}
+
+static void pci_restore_ltr_state(struct pci_dev *dev)
+{
+ struct pci_cap_saved_state *save_state;
+ int ltr;
+ u16 *cap;
+
+ save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_LTR);
+ ltr = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_LTR);
+ if (!save_state || !ltr)
+ return;
+
+ cap = (u16 *)&save_state->cap.data[0];
+ pci_write_config_word(dev, ltr + PCI_LTR_MAX_SNOOP_LAT, *cap++);
+ pci_write_config_word(dev, ltr + PCI_LTR_MAX_NOSNOOP_LAT, *cap++);
+}
/**
* pci_save_state - save the PCI configuration space of a device before suspending
@@ -1291,6 +1329,7 @@ int pci_save_state(struct pci_dev *dev)
if (i != 0)
return i;
+ pci_save_ltr_state(dev);
pci_save_dpc_state(dev);
return pci_save_vc_state(dev);
}
@@ -1390,7 +1429,12 @@ void pci_restore_state(struct pci_dev *dev)
if (!dev->state_saved)
return;
- /* PCI Express register must be restored first */
+ /*
+ * Restore max latencies (in the LTR capability) before enabling
+ * LTR itself (in the PCIe capability).
+ */
+ pci_restore_ltr_state(dev);
+
pci_restore_pcie_state(dev);
pci_restore_pasid_state(dev);
pci_restore_pri_state(dev);
@@ -2998,6 +3042,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev)
if (error)
pci_err(dev, "unable to preallocate PCI-X save buffer\n");
+ error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_LTR,
+ 2 * sizeof(u16));
+ if (error)
+ pci_err(dev, "unable to allocate suspend buffer for LTR\n");
+
pci_allocate_vc_save_buffers(dev);
}
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index fed29de783e0..f8fc2114ad39 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -117,7 +117,7 @@ bool pci_aer_available(void)
static int ecrc_policy = ECRC_POLICY_DEFAULT;
-static const char *ecrc_policy_str[] = {
+static const char * const ecrc_policy_str[] = {
[ECRC_POLICY_DEFAULT] = "bios",
[ECRC_POLICY_OFF] = "off",
[ECRC_POLICY_ON] = "on"
@@ -203,11 +203,8 @@ void pcie_ecrc_get_policy(char *str)
{
int i;
- for (i = 0; i < ARRAY_SIZE(ecrc_policy_str); i++)
- if (!strncmp(str, ecrc_policy_str[i],
- strlen(ecrc_policy_str[i])))
- break;
- if (i >= ARRAY_SIZE(ecrc_policy_str))
+ i = match_string(ecrc_policy_str, ARRAY_SIZE(ecrc_policy_str), str);
+ if (i < 0)
return;
ecrc_policy = i;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 257b9f6f2ebb..1078195f244a 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1856,8 +1856,6 @@ static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp)
pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
hpp->latency_timer);
pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
- if (hpp->enable_serr)
- pci_bctl |= PCI_BRIDGE_CTL_SERR;
if (hpp->enable_perr)
pci_bctl |= PCI_BRIDGE_CTL_PARITY;
pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
@@ -2071,11 +2069,8 @@ static void pci_configure_ltr(struct pci_dev *dev)
{
#ifdef CONFIG_PCIEASPM
struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
- u32 cap;
struct pci_dev *bridge;
-
- if (!host->native_ltr)
- return;
+ u32 cap, ctl;
if (!pci_is_pcie(dev))
return;
@@ -2084,22 +2079,35 @@ static void pci_configure_ltr(struct pci_dev *dev)
if (!(cap & PCI_EXP_DEVCAP2_LTR))
return;
- /*
- * Software must not enable LTR in an Endpoint unless the Root
- * Complex and all intermediate Switches indicate support for LTR.
- * PCIe r3.1, sec 6.18.
- */
- if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT)
- dev->ltr_path = 1;
- else {
+ pcie_capability_read_dword(dev, PCI_EXP_DEVCTL2, &ctl);
+ if (ctl & PCI_EXP_DEVCTL2_LTR_EN) {
+ if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) {
+ dev->ltr_path = 1;
+ return;
+ }
+
bridge = pci_upstream_bridge(dev);
if (bridge && bridge->ltr_path)
dev->ltr_path = 1;
+
+ return;
}
- if (dev->ltr_path)
+ if (!host->native_ltr)
+ return;
+
+ /*
+ * Software must not enable LTR in an Endpoint unless the Root
+ * Complex and all intermediate Switches indicate support for LTR.
+ * PCIe r4.0, sec 6.18.
+ */
+ if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
+ ((bridge = pci_upstream_bridge(dev)) &&
+ bridge->ltr_path)) {
pcie_capability_set_word(dev, PCI_EXP_DEVCTL2,
PCI_EXP_DEVCTL2_LTR_EN);
+ dev->ltr_path = 1;
+ }
#endif
}
@@ -2129,6 +2137,24 @@ static void pci_configure_eetlp_prefix(struct pci_dev *dev)
#endif
}
+static void pci_configure_serr(struct pci_dev *dev)
+{
+ u16 control;
+
+ if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+
+ /*
+ * A bridge will not forward ERR_ messages coming from an
+ * endpoint unless SERR# forwarding is enabled.
+ */
+ pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &control);
+ if (!(control & PCI_BRIDGE_CTL_SERR)) {
+ control |= PCI_BRIDGE_CTL_SERR;
+ pci_write_config_word(dev, PCI_BRIDGE_CONTROL, control);
+ }
+ }
+}
+
static void pci_configure_device(struct pci_dev *dev)
{
struct hotplug_params hpp;
@@ -2139,6 +2165,7 @@ static void pci_configure_device(struct pci_dev *dev)
pci_configure_relaxed_ordering(dev);
pci_configure_ltr(dev);
pci_configure_eetlp_prefix(dev);
+ pci_configure_serr(dev);
memset(&hpp, 0, sizeof(hpp));
ret = pci_get_hp_params(dev, &hpp);
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-26 18:22:13 +0000