diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
index e8c411b63cafab4366219e03800c95cb7a6d0fc6..f54a60131de5f9b7b9cfa2225151368754e63a34 100644
--- a/arch/powerpc/include/asm/eeh.h
+++ b/arch/powerpc/include/asm/eeh.h
@@ -84,7 +84,8 @@ struct eeh_pe {
* another tree except the currently existing tree of PCI
* buses and PCI devices
*/
-#define EEH_DEV_IRQ_DISABLED (1<<0) /* Interrupt disabled */
+#define EEH_DEV_IRQ_DISABLED (1 << 0) /* Interrupt disabled */
+#define EEH_DEV_DISCONNECTED (1 << 1) /* Removing from PE */
struct eeh_dev {
int mode; /* EEH mode */
@@ -97,6 +98,7 @@ struct eeh_dev {
struct pci_controller *phb; /* Associated PHB */
struct device_node *dn; /* Associated device node */
struct pci_dev *pdev; /* Associated PCI device */
+ struct pci_bus *bus; /* PCI bus for partial hotplug */
};
static inline struct device_node *eeh_dev_to_of_node(struct eeh_dev *edev)
@@ -197,6 +199,8 @@ struct eeh_pe *eeh_pe_get(struct eeh_dev *edev);
int eeh_add_to_parent_pe(struct eeh_dev *edev);
int eeh_rmv_from_parent_pe(struct eeh_dev *edev);
void eeh_pe_update_time_stamp(struct eeh_pe *pe);
+void *eeh_pe_traverse(struct eeh_pe *root,
+ eeh_traverse_func fn, void *flag);
void *eeh_pe_dev_traverse(struct eeh_pe *root,
eeh_traverse_func fn, void *flag);
void eeh_pe_restore_bars(struct eeh_pe *pe);
diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index 56bd4584f61fa5054920cb7edff1fc1b53176a4e..a5783f1a7a96212bb9446a118ea66da19967180e 100644
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -900,7 +900,21 @@ void eeh_add_device_late(struct pci_dev *dev)
pr_debug("EEH: Already referenced !\n");
return;
}
- WARN_ON(edev->pdev);
+
+ /*
+ * The EEH cache might not be removed correctly because of
+ * unbalanced kref to the device during unplug time, which
+ * relies on pcibios_release_device(). So we have to remove
+ * that here explicitly.
+ */
+ if (edev->pdev) {
+ eeh_rmv_from_parent_pe(edev);
+ eeh_addr_cache_rmv_dev(edev->pdev);
+ eeh_sysfs_remove_device(edev->pdev);
+
+ edev->pdev = NULL;
+ dev->dev.archdata.edev = NULL;
+ }
edev->pdev = dev;
dev->dev.archdata.edev = edev;
@@ -982,14 +996,24 @@ void eeh_remove_device(struct pci_dev *dev)
/* Unregister the device with the EEH/PCI address search system */
pr_debug("EEH: Removing device %s\n", pci_name(dev));
- if (!edev || !edev->pdev) {
+ if (!edev || !edev->pdev || !edev->pe) {
pr_debug("EEH: Not referenced !\n");
return;
}
+
+ /*
+ * During the hotplug for EEH error recovery, we need the EEH
+ * device attached to the parent PE in order for BAR restore
+ * a bit later. So we keep it for BAR restore and remove it
+ * from the parent PE during the BAR resotre.
+ */
edev->pdev = NULL;
dev->dev.archdata.edev = NULL;
+ if (!(edev->pe->state & EEH_PE_KEEP))
+ eeh_rmv_from_parent_pe(edev);
+ else
+ edev->mode |= EEH_DEV_DISCONNECTED;
- eeh_rmv_from_parent_pe(edev);
eeh_addr_cache_rmv_dev(dev);
eeh_sysfs_remove_device(dev);
}
diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
index 9ef3bbb8580a50e7d90fde9f447206337060f61c..9fda75d1f5aa9425ed68c19d445fa30072ce7ab5 100644
--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -338,6 +338,54 @@ static void *eeh_report_failure(void *data, void *userdata)
return NULL;
}
+static void *eeh_rmv_device(void *data, void *userdata)
+{
+ struct pci_driver *driver;
+ struct eeh_dev *edev = (struct eeh_dev *)data;
+ struct pci_dev *dev = eeh_dev_to_pci_dev(edev);
+ int *removed = (int *)userdata;
+
+ /*
+ * Actually, we should remove the PCI bridges as well.
+ * However, that's lots of complexity to do that,
+ * particularly some of devices under the bridge might
+ * support EEH. So we just care about PCI devices for
+ * simplicity here.
+ */
+ if (!dev || (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE))
+ return NULL;
+ driver = eeh_pcid_get(dev);
+ if (driver && driver->err_handler)
+ return NULL;
+
+ /* Remove it from PCI subsystem */
+ pr_debug("EEH: Removing %s without EEH sensitive driver\n",
+ pci_name(dev));
+ edev->bus = dev->bus;
+ edev->mode |= EEH_DEV_DISCONNECTED;
+ (*removed)++;
+
+ pci_stop_and_remove_bus_device(dev);
+
+ return NULL;
+}
+
+static void *eeh_pe_detach_dev(void *data, void *userdata)
+{
+ struct eeh_pe *pe = (struct eeh_pe *)data;
+ struct eeh_dev *edev, *tmp;
+
+ eeh_pe_for_each_dev(pe, edev, tmp) {
+ if (!(edev->mode & EEH_DEV_DISCONNECTED))
+ continue;
+
+ edev->mode &= ~(EEH_DEV_DISCONNECTED | EEH_DEV_IRQ_DISABLED);
+ eeh_rmv_from_parent_pe(edev);
+ }
+
+ return NULL;
+}
+
/**
* eeh_reset_device - Perform actual reset of a pci slot
* @pe: EEH PE
@@ -349,8 +397,9 @@ static void *eeh_report_failure(void *data, void *userdata)
*/
static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus)
{
+ struct pci_bus *frozen_bus = eeh_pe_bus_get(pe);
struct timeval tstamp;
- int cnt, rc;
+ int cnt, rc, removed = 0;
/* pcibios will clear the counter; save the value */
cnt = pe->freeze_count;
@@ -362,10 +411,11 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus)
* devices are expected to be attached soon when calling
* into pcibios_add_pci_devices().
*/
- if (bus) {
- eeh_pe_state_mark(pe, EEH_PE_KEEP);
+ eeh_pe_state_mark(pe, EEH_PE_KEEP);
+ if (bus)
pcibios_remove_pci_devices(bus);
- }
+ else if (frozen_bus)
+ eeh_pe_dev_traverse(pe, eeh_rmv_device, &removed);
/* Reset the pci controller. (Asserts RST#; resets config space).
* Reconfigure bridges and devices. Don't try to bring the system
@@ -386,10 +436,24 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus)
* potentially weird things happen.
*/
if (bus) {
+ pr_info("EEH: Sleep 5s ahead of complete hotplug\n");
ssleep(5);
+
+ /*
+ * The EEH device is still connected with its parent
+ * PE. We should disconnect it so the binding can be
+ * rebuilt when adding PCI devices.
+ */
+ eeh_pe_traverse(pe, eeh_pe_detach_dev, NULL);
pcibios_add_pci_devices(bus);
- eeh_pe_state_clear(pe, EEH_PE_KEEP);
+ } else if (frozen_bus && removed) {
+ pr_info("EEH: Sleep 5s ahead of partial hotplug\n");
+ ssleep(5);
+
+ eeh_pe_traverse(pe, eeh_pe_detach_dev, NULL);
+ pcibios_add_pci_devices(frozen_bus);
}
+ eeh_pe_state_clear(pe, EEH_PE_KEEP);
pe->tstamp = tstamp;
pe->freeze_count = cnt;
diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c
index c8b815e45c8f656f0bdec618e1a4fca311c9e78e..2aa955ae01a143e3a46f7acd923112cb46ca164f 100644
--- a/arch/powerpc/kernel/eeh_pe.c
+++ b/arch/powerpc/kernel/eeh_pe.c
@@ -149,8 +149,8 @@ static struct eeh_pe *eeh_pe_next(struct eeh_pe *pe,
* callback returns something other than NULL, or no more PEs
* to be traversed.
*/
-static void *eeh_pe_traverse(struct eeh_pe *root,
- eeh_traverse_func fn, void *flag)
+void *eeh_pe_traverse(struct eeh_pe *root,
+ eeh_traverse_func fn, void *flag)
{
struct eeh_pe *pe;
void *ret;
@@ -409,8 +409,8 @@ int eeh_rmv_from_parent_pe(struct eeh_dev *edev)
int cnt;
if (!edev->pe) {
- pr_warning("%s: No PE found for EEH device %s\n",
- __func__, edev->dn->full_name);
+ pr_debug("%s: No PE found for EEH device %s\n",
+ __func__, edev->dn->full_name);
return -EEXIST;
}
@@ -728,18 +728,12 @@ static void eeh_restore_device_bars(struct eeh_dev *edev,
*/
static void *eeh_restore_one_device_bars(void *data, void *flag)
{
- struct pci_dev *pdev = NULL;
struct eeh_dev *edev = (struct eeh_dev *)data;
+ struct pci_dev *pdev = eeh_dev_to_pci_dev(edev);
struct device_node *dn = eeh_dev_to_of_node(edev);
- /* Trace the PCI bridge */
- if (eeh_probe_mode_dev()) {
- pdev = eeh_dev_to_pci_dev(edev);
- if (pdev->hdr_type != PCI_HEADER_TYPE_BRIDGE)
- pdev = NULL;
- }
-
- if (pdev)
+ /* Do special restore for bridges */
+ if (pdev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
eeh_restore_bridge_bars(pdev, edev, dn);
else
eeh_restore_device_bars(edev, dn);
diff --git a/arch/powerpc/kernel/eeh_sysfs.c b/arch/powerpc/kernel/eeh_sysfs.c
index e7ae3484918c29639ff1a1baa597579a973fe6cd..61e2a145213112b20c6b04bcaa4dfbf0f70e52de 100644
--- a/arch/powerpc/kernel/eeh_sysfs.c
+++ b/arch/powerpc/kernel/eeh_sysfs.c
@@ -68,6 +68,13 @@ void eeh_sysfs_add_device(struct pci_dev *pdev)
void eeh_sysfs_remove_device(struct pci_dev *pdev)
{
+ /*
+ * The parent directory might have been removed. We needn't
+ * continue for that case.
+ */
+ if (!pdev->dev.kobj.sd)
+ return;
+
device_remove_file(&pdev->dev, &dev_attr_eeh_mode);
device_remove_file(&pdev->dev, &dev_attr_eeh_config_addr);
device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 969cce73055af337f3b15c9c12df27dc3aebb4ed..a380428cf9ce4224d074079431d5535fff839a7c 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -114,7 +114,7 @@ static int powernv_eeh_dev_probe(struct pci_dev *dev, void *flag)
* the root bridge. So it's not reasonable to continue
* the probing.
*/
- if (!dn || !edev)
+ if (!dn || !edev || edev->pe)
return 0;
/* Skip for PCI-ISA bridge */
diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c b/arch/powerpc/platforms/pseries/eeh_pseries.c
index b456b157d33d107842a42d3b0c3d0da36e9ea121..0f44f9fe49ac66c825d49e0a78d3de1a31cd4678 100644
--- a/arch/powerpc/platforms/pseries/eeh_pseries.c
+++ b/arch/powerpc/platforms/pseries/eeh_pseries.c
@@ -153,7 +153,7 @@ static void *pseries_eeh_of_probe(struct device_node *dn, void *flag)
/* Retrieve OF node and eeh device */
edev = of_node_to_eeh_dev(dn);
- if (!of_device_is_available(dn))
+ if (edev->pe || !of_device_is_available(dn))
return NULL;
/* Retrieve class/vendor/device IDs */