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powerpc/pseries: Flush SLB contents on SLB MCE errors.

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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>
This commit is contained in:
Mahesh Salgaonkar
2018-09-11 19:57:00 +05:30
committed by Michael Ellerman
parent 04fce21c9d
commit a43c159042
10 changed files with 213 additions and 6 deletions
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9
arch/powerpc/kernel/mce.c
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@@ -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;
}