[PATCH] PCI Bus Parity Status-broken hardware attribute, EDAC foundation

Currently, the EDAC (error detection and correction) modules that are in
the kernel contain some features that need to be moved. After some good
feedback on the PCI Parity detection code and interface
(http://www.ussg.iu.edu/hypermail/linux/kernel/0603.1/0897.html) this
patch ADDs an new attribute to the pci_dev structure: Namely the
'broken_parity_status' bit.

When set this indicates that the respective hardware generates false
positives of Parity errors.

The EDAC "blacklist" solution was inferior and will be removed in a
future patch.

Also in this patch is a PCI quirk.c entry for an Infiniband PCI-X card
which generates false positive parity errors.

I am requesting comments on this AND on the possibility of a exposing
this 'broken_parity_status' bit to userland via the PCI device sysfs
directory for devices. This access would allow for enabling of this
feature on new devices and for old devices that have their drivers
updated. (SLES 9 SP3 did this on an ATI motherboard video device). There
is a need to update such a PCI attribute between kernel releases.

This patch just adds a storage place for the attribute and a quirk entry
for a known bad PCI device. PCI Parity reaper/harvestor operations are
in EDAC itself and will be refactored to use this PCI attribute instead
of its own mechanisms (which are currently disabled) in the future.

Signed-off-by: Doug Thompson <norsk5@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/pci.h b/include/linux/pci.h
index b9eb9b021d6a..91c37750cd34 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -162,6 +162,7 @@ struct pci_dev {
         unsigned int    is_busmaster:1; /* device is busmaster */
         unsigned int    no_msi:1;       /* device may not use msi */
         unsigned int    block_ucfg_access:1;    /* userspace config space access is blocked */
+        unsigned int    broken_parity_status:1; /* Device generates false positive parity */
 
         u32             saved_config_space[16]; /* config space saved at suspend time */
         struct hlist_head saved_cap_space;
diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index bcfe9d4f56ae..3d197cdcfa3a 100644
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -1946,6 +1946,7 @@
 
 #define PCI_VENDOR_ID_MELLANOX          0x15b3
 #define PCI_DEVICE_ID_MELLANOX_TAVOR    0x5a44
+#define PCI_DEVICE_ID_MELLANOX_TAVOR_BRIDGE     0x5a46
 #define PCI_DEVICE_ID_MELLANOX_ARBEL_COMPAT 0x6278
 #define PCI_DEVICE_ID_MELLANOX_ARBEL    0x6282
 #define PCI_DEVICE_ID_MELLANOX_SINAI_OLD 0x5e8c