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authorMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>2018-09-11 17:27:00 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2018-09-19 14:59:22 +0300
commita43c1590426c44a5c6bbaf51b70a36a5c6d86914 (patch)
treedf756695fbf54f7aca9bf2d9f54160a13ffebe29 /arch/powerpc/platforms/powernv/setup.c
parent04fce21c9db54695389200b50b0b7a7866232ba6 (diff)
downloadlinux-a43c1590426c44a5c6bbaf51b70a36a5c6d86914.tar.xz
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/platforms/powernv/setup.c')
-rw-r--r--arch/powerpc/platforms/powernv/setup.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index adddde023622..c9cbd11a442e 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -437,6 +437,16 @@ static unsigned long pnv_get_proc_freq(unsigned int cpu)
return ret_freq;
}
+static long pnv_machine_check_early(struct pt_regs *regs)
+{
+ long handled = 0;
+
+ if (cur_cpu_spec && cur_cpu_spec->machine_check_early)
+ handled = cur_cpu_spec->machine_check_early(regs);
+
+ return handled;
+}
+
define_machine(powernv) {
.name = "PowerNV",
.probe = pnv_probe,
@@ -448,6 +458,7 @@ define_machine(powernv) {
.machine_shutdown = pnv_shutdown,
.power_save = NULL,
.calibrate_decr = generic_calibrate_decr,
+ .machine_check_early = pnv_machine_check_early,
#ifdef CONFIG_KEXEC_CORE
.kexec_cpu_down = pnv_kexec_cpu_down,
#endif