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[POWERPC] Show EEH per-device false positives
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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>
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Linas Vepstas authored and Paul Mackerras committed Jun 14, 2007
1 parent e1d04c9 commit 858955b
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Showing 3 changed files with 9 additions and 0 deletions.
5 changes: 5 additions & 0 deletions arch/powerpc/platforms/pseries/eeh.c
Original file line number Diff line number Diff line change
Expand Up @@ -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;
}
Expand All @@ -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;
}
Expand All @@ -522,13 +524,15 @@ 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;
}

/* 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;
}
Expand Down Expand Up @@ -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 */
Expand Down
3 changes: 3 additions & 0 deletions arch/powerpc/platforms/pseries/eeh_sysfs.c
Original file line number Diff line number Diff line change
Expand Up @@ -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)
{
Expand All @@ -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)
Expand All @@ -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);
}

1 change: 1 addition & 0 deletions include/asm-powerpc/pci-bridge.h
Original file line number Diff line number Diff line change
Expand Up @@ -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
};
Expand Down

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