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-rw-r--r--arch/powerpc/include/asm/eeh.h2
-rw-r--r--arch/powerpc/include/asm/ppc-pci.h2
-rw-r--r--arch/powerpc/kernel/eeh.c47
-rw-r--r--arch/powerpc/kernel/eeh_driver.c32
-rw-r--r--drivers/vfio/vfio_spapr_eeh.c6
5 files changed, 55 insertions, 34 deletions
diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index 2ff123f745cc..0b655810f32d 100644
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h
@@ -300,7 +300,7 @@ void eeh_dev_release(struct pci_dev *pdev);
struct eeh_pe *eeh_iommu_group_to_pe(struct iommu_group *group);
int eeh_pe_set_option(struct eeh_pe *pe, int option);
int eeh_pe_get_state(struct eeh_pe *pe);
-int eeh_pe_reset(struct eeh_pe *pe, int option);
+int eeh_pe_reset(struct eeh_pe *pe, int option, bool include_passed);
int eeh_pe_configure(struct eeh_pe *pe);
int eeh_pe_inject_err(struct eeh_pe *pe, int type, int func,
unsigned long addr, unsigned long mask);
diff --git a/arch/powerpc/include/asm/ppc-pci.h b/arch/powerpc/include/asm/ppc-pci.h
index 08e094eaeccf..f191ef0d2a0a 100644
--- a/arch/powerpc/include/asm/ppc-pci.h
+++ b/arch/powerpc/include/asm/ppc-pci.h
@@ -53,7 +53,7 @@ void eeh_addr_cache_rmv_dev(struct pci_dev *dev);
struct eeh_dev *eeh_addr_cache_get_dev(unsigned long addr);
void eeh_slot_error_detail(struct eeh_pe *pe, int severity);
int eeh_pci_enable(struct eeh_pe *pe, int function);
-int eeh_pe_reset_full(struct eeh_pe *pe);
+int eeh_pe_reset_full(struct eeh_pe *pe, bool include_passed);
void eeh_save_bars(struct eeh_dev *edev);
int rtas_write_config(struct pci_dn *, int where, int size, u32 val);
int rtas_read_config(struct pci_dn *, int where, int size, u32 *val);
diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index 8d32587b07dc..416d1ef49762 100644
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -877,6 +877,24 @@ static void *eeh_set_dev_freset(struct eeh_dev *edev, void *flag)
return NULL;
}
+static void eeh_pe_refreeze_passed(struct eeh_pe *root)
+{
+ struct eeh_pe *pe;
+ int state;
+
+ eeh_for_each_pe(root, pe) {
+ if (eeh_pe_passed(pe)) {
+ state = eeh_ops->get_state(pe, NULL);
+ if (state &
+ (EEH_STATE_MMIO_ACTIVE | EEH_STATE_MMIO_ENABLED)) {
+ pr_info("EEH: Passed-through PE PHB#%x-PE#%x was thawed by reset, re-freezing for safety.\n",
+ pe->phb->global_number, pe->addr);
+ eeh_pe_set_option(pe, EEH_OPT_FREEZE_PE);
+ }
+ }
+ }
+}
+
/**
* eeh_pe_reset_full - Complete a full reset process on the indicated PE
* @pe: EEH PE
@@ -889,7 +907,7 @@ static void *eeh_set_dev_freset(struct eeh_dev *edev, void *flag)
*
* This function will attempt to reset a PE three times before failing.
*/
-int eeh_pe_reset_full(struct eeh_pe *pe)
+int eeh_pe_reset_full(struct eeh_pe *pe, bool include_passed)
{
int reset_state = (EEH_PE_RESET | EEH_PE_CFG_BLOCKED);
int type = EEH_RESET_HOT;
@@ -911,11 +929,11 @@ int eeh_pe_reset_full(struct eeh_pe *pe)
/* Make three attempts at resetting the bus */
for (i = 0; i < 3; i++) {
- ret = eeh_pe_reset(pe, type);
+ ret = eeh_pe_reset(pe, type, include_passed);
if (ret)
break;
- ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE);
+ ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE, include_passed);
if (ret)
break;
@@ -936,6 +954,12 @@ int eeh_pe_reset_full(struct eeh_pe *pe)
__func__, state, pe->phb->global_number, pe->addr, (i + 1));
}
+ /* Resetting the PE may have unfrozen child PEs. If those PEs have been
+ * (potentially) passed through to a guest, re-freeze them:
+ */
+ if (!include_passed)
+ eeh_pe_refreeze_passed(pe);
+
eeh_pe_state_clear(pe, reset_state, true);
return ret;
}
@@ -1611,13 +1635,12 @@ int eeh_pe_get_state(struct eeh_pe *pe)
}
EXPORT_SYMBOL_GPL(eeh_pe_get_state);
-static int eeh_pe_reenable_devices(struct eeh_pe *pe)
+static int eeh_pe_reenable_devices(struct eeh_pe *pe, bool include_passed)
{
struct eeh_dev *edev, *tmp;
struct pci_dev *pdev;
int ret = 0;
- /* Restore config space */
eeh_pe_restore_bars(pe);
/*
@@ -1638,9 +1661,13 @@ static int eeh_pe_reenable_devices(struct eeh_pe *pe)
}
/* The PE is still in frozen state */
- ret = eeh_unfreeze_pe(pe);
+ if (include_passed || !eeh_pe_passed(pe)) {
+ ret = eeh_unfreeze_pe(pe);
+ } else
+ pr_info("EEH: Note: Leaving passthrough PHB#%x-PE#%x frozen.\n",
+ pe->phb->global_number, pe->addr);
if (!ret)
- eeh_pe_state_clear(pe, EEH_PE_ISOLATED, true);
+ eeh_pe_state_clear(pe, EEH_PE_ISOLATED, include_passed);
return ret;
}
@@ -1654,7 +1681,7 @@ static int eeh_pe_reenable_devices(struct eeh_pe *pe)
* indicated type, either fundamental reset or hot reset.
* PE reset is the most important part for error recovery.
*/
-int eeh_pe_reset(struct eeh_pe *pe, int option)
+int eeh_pe_reset(struct eeh_pe *pe, int option, bool include_passed)
{
int ret = 0;
@@ -1668,11 +1695,11 @@ int eeh_pe_reset(struct eeh_pe *pe, int option)
switch (option) {
case EEH_RESET_DEACTIVATE:
ret = eeh_ops->reset(pe, option);
- eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED, true);
+ eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED, include_passed);
if (ret)
break;
- ret = eeh_pe_reenable_devices(pe);
+ ret = eeh_pe_reenable_devices(pe, include_passed);
break;
case EEH_RESET_HOT:
case EEH_RESET_FUNDAMENTAL:
diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
index 91629b3f3b74..89623962c727 100644
--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -510,22 +510,11 @@ static void *eeh_rmv_device(struct eeh_dev *edev, void *userdata)
* support EEH. So we just care about PCI devices for
* simplicity here.
*/
- if (!dev || (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE))
- return NULL;
-
- /*
- * We rely on count-based pcibios_release_device() to
- * detach permanently offlined PEs. Unfortunately, that's
- * not reliable enough. We might have the permanently
- * offlined PEs attached, but we needn't take care of
- * them and their child devices.
- */
- if (eeh_dev_removed(edev))
+ if (!eeh_edev_actionable(edev) ||
+ (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE))
return NULL;
if (rmv_data) {
- if (eeh_pe_passed(edev->pe))
- return NULL;
driver = eeh_pcid_get(dev);
if (driver) {
if (driver->err_handler &&
@@ -539,8 +528,8 @@ static void *eeh_rmv_device(struct eeh_dev *edev, void *userdata)
}
/* Remove it from PCI subsystem */
- pr_debug("EEH: Removing %s without EEH sensitive driver\n",
- pci_name(dev));
+ pr_info("EEH: Removing %s without EEH sensitive driver\n",
+ pci_name(dev));
edev->mode |= EEH_DEV_DISCONNECTED;
if (rmv_data)
rmv_data->removed_dev_count++;
@@ -624,7 +613,7 @@ int eeh_pe_reset_and_recover(struct eeh_pe *pe)
eeh_pe_dev_traverse(pe, eeh_dev_save_state, NULL);
/* Issue reset */
- ret = eeh_pe_reset_full(pe);
+ ret = eeh_pe_reset_full(pe, true);
if (ret) {
eeh_pe_state_clear(pe, EEH_PE_RECOVERING, true);
return ret;
@@ -664,6 +653,11 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus,
time64_t tstamp;
int cnt, rc;
struct eeh_dev *edev;
+ struct eeh_pe *tmp_pe;
+ bool any_passed = false;
+
+ eeh_for_each_pe(pe, tmp_pe)
+ any_passed |= eeh_pe_passed(tmp_pe);
/* pcibios will clear the counter; save the value */
cnt = pe->freeze_count;
@@ -676,7 +670,7 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus,
* into pci_hp_add_devices().
*/
eeh_pe_state_mark(pe, EEH_PE_KEEP);
- if (driver_eeh_aware || (pe->type & EEH_PE_VF)) {
+ if (any_passed || driver_eeh_aware || (pe->type & EEH_PE_VF)) {
eeh_pe_dev_traverse(pe, eeh_rmv_device, rmv_data);
} else {
pci_lock_rescan_remove();
@@ -693,7 +687,7 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus,
* config accesses. So we prefer to block them. However, controlled
* PCI config accesses initiated from EEH itself are allowed.
*/
- rc = eeh_pe_reset_full(pe);
+ rc = eeh_pe_reset_full(pe, false);
if (rc)
return rc;
@@ -704,7 +698,7 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus,
eeh_pe_restore_bars(pe);
/* Clear frozen state */
- rc = eeh_clear_pe_frozen_state(pe, true);
+ rc = eeh_clear_pe_frozen_state(pe, false);
if (rc) {
pci_unlock_rescan_remove();
return rc;
diff --git a/drivers/vfio/vfio_spapr_eeh.c b/drivers/vfio/vfio_spapr_eeh.c
index 38edeb4729a9..1a742fe8f6db 100644
--- a/drivers/vfio/vfio_spapr_eeh.c
+++ b/drivers/vfio/vfio_spapr_eeh.c
@@ -74,13 +74,13 @@ long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
ret = eeh_pe_get_state(pe);
break;
case VFIO_EEH_PE_RESET_DEACTIVATE:
- ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE);
+ ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE, true);
break;
case VFIO_EEH_PE_RESET_HOT:
- ret = eeh_pe_reset(pe, EEH_RESET_HOT);
+ ret = eeh_pe_reset(pe, EEH_RESET_HOT, true);
break;
case VFIO_EEH_PE_RESET_FUNDAMENTAL:
- ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL);
+ ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL, true);
break;
case VFIO_EEH_PE_CONFIGURE:
ret = eeh_pe_configure(pe);
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-10 06:47:55 +0200