drivers/edac: add new nmi rescan

Provides a way for NMI reported errors on x86 to notify the EDAC
subsystem pending ECC errors by writing to a software state variable.

Here's the reworked patch. I added an EDAC stub to the kernel so we can
have variables that are in the kernel even if EDAC is a module. I also
implemented the idea of using the chip driver to select error detection
mode via module parameter and eliminate the kernel compile option.
Please review/test. Thx!

Also, I only made changes to some of the chipset drivers since I am
unfamiliar with the other ones. We can add similar changes as we go.

Signed-off-by: Dave Jiang <djiang@mvista.com>
Signed-off-by: Douglas Thompson <dougthompson@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/edac/i5000_edac.c b/drivers/edac/i5000_edac.c
index 4d7e786065aa..8eb8b6e5b32c 100644
--- a/drivers/edac/i5000_edac.c
+++ b/drivers/edac/i5000_edac.c
@@ -19,6 +19,7 @@
 #include <linux/pci.h>
 #include <linux/pci_ids.h>
 #include <linux/slab.h>
+#include <linux/edac.h>
 #include <asm/mmzone.h>
 
 #include "edac_mc.h"
@@ -1285,6 +1286,16 @@ static int i5000_probe1(struct pci_dev *pdev, int dev_idx)
         if (PCI_FUNC(pdev->devfn) != 0)
                 return -ENODEV;
 
+        /* make sure error reporting method is sane */
+        switch(edac_op_state) {
+                case EDAC_OPSTATE_POLL:
+                case EDAC_OPSTATE_NMI:
+                        break;
+                default:
+                        edac_op_state = EDAC_OPSTATE_POLL;
+                        break;
+        }
+
         /* Ask the devices for the number of CSROWS and CHANNELS so
          * that we can calculate the memory resources, etc
          *
@@ -1475,3 +1486,5 @@ MODULE_AUTHOR
     ("Linux Networx (http://lnxi.com) Doug Thompson <norsk5@xmission.com>");
 MODULE_DESCRIPTION("MC Driver for Intel I5000 memory controllers - "
                    I5000_REVISION);
+module_param(edac_op_state, int, 0444);
+MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");