[IA64] Cache error recovery

Similar to memory error recovery, when a cache error is consumed
by a user process terminate the user instead of crashing the system.

Signed-off-by: Russ Anderson (rja@sgi.com)
Acked-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 11 insertions, 21 deletions

diff --git a/arch/ia64/kernel/mca_drv.c b/arch/ia64/kernel/mca_drv.c
index 5e2d18fbce40..832cf1e647e8 100644
--- a/arch/ia64/kernel/mca_drv.c
+++ b/arch/ia64/kernel/mca_drv.c
@@ -602,6 +602,8 @@ recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx,
                 default:
                         break;
                 }
+        } else if (psp->cc && !psp->bc) {       /* Cache error */
+                status = recover_from_read_error(slidx, peidx, pbci, sos);
         }
 
         return status;
@@ -645,13 +647,6 @@ recover_from_tlb_check(peidx_table_t *peidx)
  * Return value:
  *      1 on Success / 0 on Failure
  */
-/*
- *  Later we try to recover when below all conditions are satisfied.
- *   1. Only one processor error section is exist.
- *   2. BUS_CHECK is exist and the others are not exist.(Except TLB_CHECK)
- *   3. The entry of BUS_CHECK_INFO is 1.
- *   4. "External bus error" flag is set and the others are not set.
- */
 
 static int
 recover_from_processor_error(int platform, slidx_table_t *slidx,
@@ -687,36 +682,31 @@ recover_from_processor_error(int platform, slidx_table_t *slidx,
         /*
          * The cache check and bus check bits have four possible states
          *   cc bc
-         *    0  0      Weird record, not recovered
-         *    1  0      Cache error, not recovered
-         *    0  1      I/O error, attempt recovery
          *    1  1      Memory error, attempt recovery
+         *    1  0      Cache error, attempt recovery
+         *    0  1      I/O error, attempt recovery
+         *    0  0      Other error type, not recovered
          */
-        if (psp->bc == 0 || pbci == NULL)
-                return fatal_mca("No bus check");
+        if (psp->cc == 0 && (psp->bc == 0 || pbci == NULL))
+                return fatal_mca("No cache or bus check");
 
         /*
-         * Sorry, we cannot handle so many.
+         * Cannot handle more than one bus check.
          */
         if (peidx_bus_check_num(peidx) > 1)
                 return fatal_mca("Too many bus checks");
-        /*
-         * Well, here is only one bus error.
-         */
+
         if (pbci->ib)
                 return fatal_mca("Internal Bus error");
-        if (pbci->cc)
-                return fatal_mca("Cache-cache error");
         if (pbci->eb && pbci->bsi > 0)
                 return fatal_mca("External bus check fatal status");
 
         /*
-         * This is a local MCA and estimated as recoverble external bus error.
-         * (e.g. a load from poisoned memory)
-         * This means "there are some platform errors".
+         * This is a local MCA and estimated as a recoverble error.
          */
         if (platform)
                 return recover_from_platform_error(slidx, peidx, pbci, sos);
+
         /*
          * On account of strange SAL error record, we cannot recover.
          */