powerpc/eeh: Cleanup eeh_pe_state_mark()

Currently, eeh_pe_state_mark() marks a PE (and it's children) with a
state and then performs additional processing if that state included
EEH_PE_ISOLATED.

The state parameter is always a constant at the call site, so
rearrange eeh_pe_state_mark() into two functions and just call the
appropriate one at each site.
Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/ppc-pci.h

@@ -58,6 +58,7 @@ 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);
 void eeh_pe_state_mark(struct eeh_pe *pe, int state);
+void eeh_pe_mark_isolated(struct eeh_pe *pe);
 void eeh_pe_state_clear(struct eeh_pe *pe, int state);
 void eeh_pe_state_mark_with_cfg(struct eeh_pe *pe, int state);
 void eeh_pe_dev_mode_mark(struct eeh_pe *pe, int mode);

arch/powerpc/kernel/eeh.c

@@ -404,7 +404,7 @@ static int eeh_phb_check_failure(struct eeh_pe *pe)
 	}
 
 	/* Isolate the PHB and send event */
-	eeh_pe_state_mark(phb_pe, EEH_PE_ISOLATED);
+	eeh_pe_mark_isolated(phb_pe);
 	eeh_serialize_unlock(flags);
 
 	pr_err("EEH: PHB#%x failure detected, location: %s\n",
@@ -563,7 +563,7 @@ int eeh_dev_check_failure(struct eeh_dev *edev)
 	 * with other functions on this device, and functions under
 	 * bridges.
 	 */
-	eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
+	eeh_pe_mark_isolated(pe);
 	eeh_serialize_unlock(flags);
 
 	/* Most EEH events are due to device driver bugs.  Having
@@ -830,7 +830,7 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state stat
 		eeh_pe_state_clear(pe, EEH_PE_ISOLATED);
 		break;
 	case pcie_hot_reset:
-		eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
+		eeh_pe_mark_isolated(pe);
 		eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED);
 		eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE);
 		eeh_pe_dev_traverse(pe, eeh_disable_and_save_dev_state, dev);
@@ -839,7 +839,7 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state stat
 		eeh_ops->reset(pe, EEH_RESET_HOT);
 		break;
 	case pcie_warm_reset:
-		eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
+		eeh_pe_mark_isolated(pe);
 		eeh_pe_state_clear(pe, EEH_PE_CFG_BLOCKED);
 		eeh_ops->set_option(pe, EEH_OPT_FREEZE_PE);
 		eeh_pe_dev_traverse(pe, eeh_disable_and_save_dev_state, dev);

arch/powerpc/kernel/eeh_driver.c

@@ -1029,7 +1029,7 @@ void eeh_handle_special_event(void)
 				phb_pe = eeh_phb_pe_get(hose);
 				if (!phb_pe) continue;
 
-				eeh_pe_state_mark(phb_pe, EEH_PE_ISOLATED);
+				eeh_pe_mark_isolated(phb_pe);
 			}
 
 			eeh_serialize_unlock(flags);
@@ -1044,11 +1044,9 @@ void eeh_handle_special_event(void)
 			/* Purge all events of the PHB */
 			eeh_remove_event(pe, true);
 
-			if (rc == EEH_NEXT_ERR_DEAD_PHB)
-				eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
-			else
-				eeh_pe_state_mark(pe,
-					EEH_PE_ISOLATED | EEH_PE_RECOVERING);
+			if (rc != EEH_NEXT_ERR_DEAD_PHB)
+				eeh_pe_state_mark(pe, EEH_PE_RECOVERING);
+			eeh_pe_mark_isolated(pe);
 
 			eeh_serialize_unlock(flags);
 

arch/powerpc/kernel/eeh_pe.c

@@ -540,56 +540,50 @@ void eeh_pe_update_time_stamp(struct eeh_pe *pe)
 }
 
 /**
- * __eeh_pe_state_mark - Mark the state for the PE
- * @data: EEH PE
- * @flag: state
+ * eeh_pe_state_mark - Mark specified state for PE and its associated device
+ * @pe: EEH PE
  *
- * The function is used to mark the indicated state for the given
- * PE. Also, the associated PCI devices will be put into IO frozen
- * state as well.
+ * EEH error affects the current PE and its child PEs. The function
+ * is used to mark appropriate state for the affected PEs and the
+ * associated devices.
  */
-static void *__eeh_pe_state_mark(struct eeh_pe *pe, void *flag)
+void eeh_pe_state_mark(struct eeh_pe *root, int state)
 {
-	int state = *((int *)flag);
-	struct eeh_dev *edev, *tmp;
-	struct pci_dev *pdev;
-
-	/* Keep the state of permanently removed PE intact */
-	if (pe->state & EEH_PE_REMOVED)
-		return NULL;
-
-	pe->state |= state;
-
-	/* Offline PCI devices if applicable */
-	if (!(state & EEH_PE_ISOLATED))
-		return NULL;
-
-	eeh_pe_for_each_dev(pe, edev, tmp) {
-		pdev = eeh_dev_to_pci_dev(edev);
-		if (pdev)
-			pdev->error_state = pci_channel_io_frozen;
-	}
-
-	/* Block PCI config access if required */
-	if (pe->state & EEH_PE_CFG_RESTRICTED)
-		pe->state |= EEH_PE_CFG_BLOCKED;
+	struct eeh_pe *pe;
 
-	return NULL;
+	eeh_for_each_pe(root, pe)
+		if (!(pe->state & EEH_PE_REMOVED))
+			pe->state |= state;
 }
+EXPORT_SYMBOL_GPL(eeh_pe_state_mark);
 
 /**
- * eeh_pe_state_mark - Mark specified state for PE and its associated device
+ * eeh_pe_mark_isolated
  * @pe: EEH PE
  *
- * EEH error affects the current PE and its child PEs. The function
- * is used to mark appropriate state for the affected PEs and the
- * associated devices.
+ * Record that a PE has been isolated by marking the PE and it's children as
+ * EEH_PE_ISOLATED (and EEH_PE_CFG_BLOCKED, if required) and their PCI devices
+ * as pci_channel_io_frozen.
  */
-void eeh_pe_state_mark(struct eeh_pe *pe, int state)
+void eeh_pe_mark_isolated(struct eeh_pe *root)
 {
-	eeh_pe_traverse(pe, __eeh_pe_state_mark, &state);
+	struct eeh_pe *pe;
+	struct eeh_dev *edev;
+	struct pci_dev *pdev;
+
+	eeh_pe_state_mark(root, EEH_PE_ISOLATED);
+	eeh_for_each_pe(root, pe) {
+		list_for_each_entry(edev, &pe->edevs, entry) {
+			pdev = eeh_dev_to_pci_dev(edev);
+			if (pdev)
+				pdev->error_state = pci_channel_io_frozen;
+		}
+		/* Block PCI config access if required */
+		if (pe->state & EEH_PE_CFG_RESTRICTED)
+			pe->state |= EEH_PE_CFG_BLOCKED;
+	}
 }
-EXPORT_SYMBOL_GPL(eeh_pe_state_mark);
+EXPORT_SYMBOL_GPL(eeh_pe_mark_isolated);
 
 static void *__eeh_pe_dev_mode_mark(struct eeh_dev *edev, void *flag)
 {

arch/powerpc/platforms/powernv/eeh-powernv.c

@@ -590,7 +590,7 @@ static int pnv_eeh_get_phb_state(struct eeh_pe *pe)
 			  EEH_STATE_MMIO_ENABLED |
 			  EEH_STATE_DMA_ENABLED);
 	} else if (!(pe->state & EEH_PE_ISOLATED)) {
-		eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
+		eeh_pe_mark_isolated(pe);
 		pnv_eeh_get_phb_diag(pe);
 
 		if (eeh_has_flag(EEH_EARLY_DUMP_LOG))
@@ -692,7 +692,7 @@ static int pnv_eeh_get_pe_state(struct eeh_pe *pe)
 		if (phb->freeze_pe)
 			phb->freeze_pe(phb, pe->addr);
 
-		eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
+		eeh_pe_mark_isolated(pe);
 		pnv_eeh_get_phb_diag(pe);
 
 		if (eeh_has_flag(EEH_EARLY_DUMP_LOG))
@@ -1597,7 +1597,7 @@ static int pnv_eeh_next_error(struct eeh_pe **pe)
 		if ((ret == EEH_NEXT_ERR_FROZEN_PE  ||
 		    ret == EEH_NEXT_ERR_FENCED_PHB) &&
 		    !((*pe)->state & EEH_PE_ISOLATED)) {
-			eeh_pe_state_mark(*pe, EEH_PE_ISOLATED);
+			eeh_pe_mark_isolated(*pe);
 			pnv_eeh_get_phb_diag(*pe);
 
 			if (eeh_has_flag(EEH_EARLY_DUMP_LOG))
@@ -1626,7 +1626,7 @@ static int pnv_eeh_next_error(struct eeh_pe **pe)
 			}
 
 			/* We possibly migrate to another PE */
-			eeh_pe_state_mark(*pe, EEH_PE_ISOLATED);
+			eeh_pe_mark_isolated(*pe);
 		}
 
 		/*

drivers/pci/hotplug/pnv_php.c

@@ -736,7 +736,7 @@ static irqreturn_t pnv_php_interrupt(int irq, void *data)
 		pe = edev ? edev->pe : NULL;
 		if (pe) {
 			eeh_serialize_lock(&flags);
-			eeh_pe_state_mark(pe, EEH_PE_ISOLATED);
+			eeh_pe_mark_isolated(pe);
 			eeh_serialize_unlock(flags);
 			eeh_pe_set_option(pe, EEH_OPT_FREEZE_PE);
 		}