3 files changed, 36 insertions, 6 deletions

diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index a76add3e76a2..491687f84fb5 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -1192,8 +1192,6 @@ void
 ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
                  struct ia64_sal_os_state *sos)
 {
-        pal_processor_state_info_t *psp = (pal_processor_state_info_t *)
-                &sos->proc_state_param;
         int recover, cpu = smp_processor_id();
         struct task_struct *previous_current;
         struct ia64_mca_notify_die nd =
@@ -1223,10 +1221,8 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
         /* Get the MCA error record and log it */
         ia64_mca_log_sal_error_record(SAL_INFO_TYPE_MCA);
 
-        /* TLB error is only exist in this SAL error record */
-        recover = (psp->tc && !(psp->cc || psp->bc || psp->rc || psp->uc))
-        /* other error recovery */
-           || (ia64_mca_ucmc_extension
+        /* MCA error recovery */
+        recover = (ia64_mca_ucmc_extension
                 && ia64_mca_ucmc_extension(
                         IA64_LOG_CURR_BUFFER(SAL_INFO_TYPE_MCA),
                         sos));
diff --git a/arch/ia64/kernel/mca_drv.c b/arch/ia64/kernel/mca_drv.c
index afc1403799c9..5e2d18fbce40 100644
--- a/arch/ia64/kernel/mca_drv.c
+++ b/arch/ia64/kernel/mca_drv.c
@@ -607,6 +607,33 @@ recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx,
         return status;
 }
 
+/*
+ * recover_from_tlb_check
+ * @peidx:      pointer of index of processor error section
+ *
+ * Return value:
+ *      1 on Success / 0 on Failure
+ */
+static int
+recover_from_tlb_check(peidx_table_t *peidx)
+{
+        sal_log_mod_error_info_t *smei;
+        pal_tlb_check_info_t *ptci;
+
+        smei = (sal_log_mod_error_info_t *)peidx_tlb_check(peidx, 0);
+        ptci = (pal_tlb_check_info_t *)&(smei->check_info);
+
+        /*
+         * Look for signature of a duplicate TLB DTC entry, which is
+         * a SW bug and always fatal.
+         */
+        if (ptci->op == PAL_TLB_CHECK_OP_PURGE
+            && !(ptci->itr || ptci->dtc || ptci->itc))
+                return fatal_mca("Duplicate TLB entry");
+
+        return mca_recovered("TLB check recovered");
+}
+
 /**
  * recover_from_processor_error
  * @platform:   whether there are some platform error section or not
@@ -652,6 +679,12 @@ recover_from_processor_error(int platform, slidx_table_t *slidx,
                 return fatal_mca("error not contained");
 
         /*
+         * Look for recoverable TLB check
+         */
+        if (psp->tc && !(psp->cc || psp->bc || psp->rc || psp->uc))
+                return recover_from_tlb_check(peidx);
+
+        /*
          * The cache check and bus check bits have four possible states
          *   cc bc
          *    0  0      Weird record, not recovered
diff --git a/include/asm-ia64/pal.h b/include/asm-ia64/pal.h
index e43021a99a20..67656ce767c2 100644
--- a/include/asm-ia64/pal.h
+++ b/include/asm-ia64/pal.h
@@ -371,6 +371,7 @@ typedef u64					pal_mc_info_index_t;
                                                          * dependent
                                                          */
 
+#define PAL_TLB_CHECK_OP_PURGE                  8
 
 typedef struct pal_process_state_info_s {
         u64             reserved1       : 2,