diff options
| author | Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> | 2018-09-11 19:57:00 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-09-19 21:59:22 +1000 |
| commit | a43c1590426c44a5c6bbaf51b70a36a5c6d86914 (patch) | |
| tree | df756695fbf54f7aca9bf2d9f54160a13ffebe29 /arch/powerpc/platforms/powernv | |
| parent | 04fce21c9db54695389200b50b0b7a7866232ba6 (diff) | |
| download | linux-a43c1590426c44a5c6bbaf51b70a36a5c6d86914.tar.bz2 | |
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')
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/setup.c | 11 |
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index 38fe4087484a..62c291e23dbe 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -578,6 +578,8 @@ int opal_machine_check(struct pt_regs *regs) { struct machine_check_event evt; + __this_cpu_inc(irq_stat.mce_exceptions); + if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) return 0; 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 |