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authorMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>2018-09-11 16:27:00 +0200
committerMichael Ellerman <mpe@ellerman.id.au>2018-09-19 13:59:22 +0200
commita43c1590426c44a5c6bbaf51b70a36a5c6d86914 (patch)
treedf756695fbf54f7aca9bf2d9f54160a13ffebe29 /arch/powerpc/kernel/mce.c
parentpowerpc/pseries: Define MCE error event section. (diff)
downloadlinux-a43c1590426c44a5c6bbaf51b70a36a5c6d86914.tar.xz
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powerpc/pseries: Flush SLB contents on SLB MCE errors.
On pseries, as of today system crashes if we get a machine check exceptions due to SLB errors. These are soft errors and can be fixed by flushing the SLBs so the kernel can continue to function instead of system crash. We do this in real mode before turning on MMU. Otherwise we would run into nested machine checks. This patch now fetches the rtas error log in real mode and flushes the SLBs on SLB/ERAT errors. Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: Michal Suchanek <msuchanek@suse.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/mce.c')
-rw-r--r--arch/powerpc/kernel/mce.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c
index efdd16a79075..bd933a75f0bc 100644
--- a/arch/powerpc/kernel/mce.c
+++ b/arch/powerpc/kernel/mce.c
@@ -488,10 +488,11 @@ long machine_check_early(struct pt_regs *regs)
{
long handled = 0;
- __this_cpu_inc(irq_stat.mce_exceptions);
-
- if (cur_cpu_spec && cur_cpu_spec->machine_check_early)
- handled = cur_cpu_spec->machine_check_early(regs);
+ /*
+ * See if platform is capable of handling machine check.
+ */
+ if (ppc_md.machine_check_early)
+ handled = ppc_md.machine_check_early(regs);
return handled;
}