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authorRuss Anderson <rja@sgi.com>2006-12-14 16:01:41 -0600
committerTony Luck <tony.luck@intel.com>2007-03-08 09:41:46 -0800
commit618b206f0b580d965eb26f704ed23beee2a8c25d (patch)
treea286eca054a9d5e8fbd54463647b68158f2a50d2 /arch/ia64/kernel/mca_drv.c
parent908e0a8a265fe8057604a9a30aec3f0be7bb5ebb (diff)
[IA64] Proper handling of TLB errors from duplicate itr.d dropins
Jack Steiner noticed that duplicate TLB DTC entries do not cause a linux panic. See discussion: http://www.gelato.unsw.edu.au/archives/linux-ia64/0307/6108.html The current TLB recovery code is recovering from the duplicate itr.d dropins, masking the underlying problem. This change modifies the MCA recovery code to look for the TLB check signature of the duplicate TLB entry and panic in that case. Signed-off-by: Russ Anderson (rja@sgi.com) Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/mca_drv.c')
-rw-r--r--arch/ia64/kernel/mca_drv.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/ia64/kernel/mca_drv.c b/arch/ia64/kernel/mca_drv.c
index afc1403799c..5e2d18fbce4 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