[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>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c
index d284a58c5b5..ff33c150535 100644
--- a/arch/powerpc/platforms/pseries/eeh.c
+++ b/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 */