[POWERPC] Show EEH per-device false positives

Track and report the number of times we read an all-1s value (0xff,
0xffff or 0xffffffff) from each device which is valid data, not
indicating EEH isolation.
Signed-off-by: Linas Vepstas <linas@austin.ibm.com>

----
 arch/powerpc/platforms/pseries/eeh.c       |    5 +++++
 arch/powerpc/platforms/pseries/eeh_sysfs.c |    3 +++
 include/asm-powerpc/pci-bridge.h           |    1 +
 3 files changed, 9 insertions(+)
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/pseries/eeh.c

@@ -505,6 +505,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
 		printk(KERN_WARNING "EEH: read_slot_reset_state() failed; rc=%d dn=%s\n",
 		       ret, dn->full_name);
 		false_positives++;
+		pdn->eeh_false_positives ++;
 		rc = 0;
 		goto dn_unlock;
 	}
@@ -513,6 +514,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
 	 * they are empty when they don't have children. */
 	if ((rets[0] == 5) && (dn->child == NULL)) {
 		false_positives++;
+		pdn->eeh_false_positives ++;
 		rc = 0;
 		goto dn_unlock;
 	}
@@ -522,6 +524,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
 		printk(KERN_WARNING "EEH: event on unsupported device, rc=%d dn=%s\n",
 		       ret, dn->full_name);
 		false_positives++;
+		pdn->eeh_false_positives ++;
 		rc = 0;
 		goto dn_unlock;
 	}
@@ -529,6 +532,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
 	/* If not the kind of error we know about, punt. */
 	if (rets[0] != 1 && rets[0] != 2 && rets[0] != 4 && rets[0] != 5) {
 		false_positives++;
+		pdn->eeh_false_positives ++;
 		rc = 0;
 		goto dn_unlock;
 	}
@@ -921,6 +925,7 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
 	pdn->eeh_mode = 0;
 	pdn->eeh_check_count = 0;
 	pdn->eeh_freeze_count = 0;
+	pdn->eeh_false_positives = 0;
 
 	if (status && strcmp(status, "ok") != 0)
 		return NULL;	/* ignore devices with bad status */

arch/powerpc/platforms/pseries/eeh_sysfs.c

@@ -58,6 +58,7 @@ EEH_SHOW_ATTR(eeh_config_addr, eeh_config_addr, "0x%x");
 EEH_SHOW_ATTR(eeh_pe_config_addr, eeh_pe_config_addr, "0x%x");
 EEH_SHOW_ATTR(eeh_check_count, eeh_check_count, "%d");
 EEH_SHOW_ATTR(eeh_freeze_count, eeh_freeze_count, "%d");
+EEH_SHOW_ATTR(eeh_false_positives, eeh_false_positives, "%d");
 
 void eeh_sysfs_add_device(struct pci_dev *pdev)
 {
@@ -67,6 +68,7 @@ void eeh_sysfs_add_device(struct pci_dev *pdev)
 	rc += device_create_file(&pdev->dev, &dev_attr_eeh_config_addr);
 	rc += device_create_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
 	rc += device_create_file(&pdev->dev, &dev_attr_eeh_check_count);
+	rc += device_create_file(&pdev->dev, &dev_attr_eeh_false_positives);
 	rc += device_create_file(&pdev->dev, &dev_attr_eeh_freeze_count);
 
 	if (rc)
@@ -79,6 +81,7 @@ void eeh_sysfs_remove_device(struct pci_dev *pdev)
 	device_remove_file(&pdev->dev, &dev_attr_eeh_config_addr);
 	device_remove_file(&pdev->dev, &dev_attr_eeh_pe_config_addr);
 	device_remove_file(&pdev->dev, &dev_attr_eeh_check_count);
+	device_remove_file(&pdev->dev, &dev_attr_eeh_false_positives);
 	device_remove_file(&pdev->dev, &dev_attr_eeh_freeze_count);
 }
 

include/asm-powerpc/pci-bridge.h

@@ -83,6 +83,7 @@ struct pci_dn {
 	int	eeh_pe_config_addr; /* new-style partition endpoint address */
 	int 	eeh_check_count;	/* # times driver ignored error */
 	int 	eeh_freeze_count;	/* # times this device froze up. */
+	int 	eeh_false_positives;	/* # times this device reported #ff's */
 	u32	config_space[16];	/* saved PCI config space */
 #endif
 };