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| author | Bryan Boatright <b1@omega71.com> | 2008-02-07 11:14:58 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-07 19:42:23 +0300 |
| commit | 6b09ff9d787911b0b46a4d286e68f1f84e8b0b94 (patch) | |
| tree | 933ef684e8881d7d9b5dbbcc60694b8f36815fea /drivers | |
| parent | 4f4aeeabc061826376c9a72b4714d062664999ea (diff) | |
| download | linux-6b09ff9d787911b0b46a4d286e68f1f84e8b0b94.tar.xz | |
drivers/edac: pci: broken parity regression
Using the EDAC code in kernel.org kernel version 2.6.23.8 I am seeing the
following problem:
In the kernel there is a pci device attribute located in sysfs that is
checked by the EDAC PCI scanning code. If that attribute is set,
PCI parity/error scannining is skipped for that device. The attribute
is:
broken_parity_status
as is located in /sys/devices/pci<XXX>/0000:XX:YY.Z directorys for
PCI devices.
I don't think this check was actually implemented. I have a misbehaved card
that reports a parity error every 1000 ms:
Nov 25 07:28:43 beta kernel: EDAC PCI: Master Data Parity Error on 0000:05:01.0
Nov 25 07:28:44 beta kernel: EDAC PCI: Master Data Parity Error on 0000:05:01.0
Nov 25 07:28:45 beta kernel: EDAC PCI: Master Data Parity Error on 0000:05:01.0
Setting that card's broken_parity_status bit did not mask the error:
echo "1" > /sys/bus/pci/devices/0000:05:01.0/broken_parity_status
I looked through the EDAC code and did not readily see any reference to
broken_parity_status at all (which makes sense based on the behavior I am
seeing). I applied the following patch as a proof-of-concept and now EDAC's
PCI parity error reporting behaves as documented:
bryan
Good regression find, bryan. It used to work. sigh.
I added more logic to your patch, for more coverage of the error.
Doug T
Signed-off-by: Bryan Boatright <b1@omega71.com>
Signed-off-by: Doug Thompson <dougthompson@xmisson.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/edac/edac_pci_sysfs.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/edac/edac_pci_sysfs.c b/drivers/edac/edac_pci_sysfs.c index 5b075da99145..71c3195d3704 100644 --- a/drivers/edac/edac_pci_sysfs.c +++ b/drivers/edac/edac_pci_sysfs.c @@ -558,8 +558,10 @@ static void edac_pci_dev_parity_test(struct pci_dev *dev) debugf4("PCI STATUS= 0x%04x %s\n", status, dev->dev.bus_id); - /* check the status reg for errors */ - if (status) { + /* check the status reg for errors on boards NOT marked as broken + * if broken, we cannot trust any of the status bits + */ + if (status && !dev->broken_parity_status) { if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { edac_printk(KERN_CRIT, EDAC_PCI, "Signaled System Error on %s\n", @@ -593,8 +595,10 @@ static void edac_pci_dev_parity_test(struct pci_dev *dev) debugf4("PCI SEC_STATUS= 0x%04x %s\n", status, dev->dev.bus_id); - /* check the secondary status reg for errors */ - if (status) { + /* check the secondary status reg for errors, + * on NOT broken boards + */ + if (status && !dev->broken_parity_status) { if (status & (PCI_STATUS_SIG_SYSTEM_ERROR)) { edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " "Signaled System Error on %s\n", |