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| author | Balbir Singh <bsingharora@gmail.com> | 2019-08-20 13:43:50 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-21 22:23:48 +1000 |
| commit | 895e3dceeb97855dc9990136cbb80a842fe581aa (patch) | |
| tree | bb179bee627472184eb81344f602d2ee4da9aef7 /arch/powerpc/kernel/mce_power.c | |
| parent | 49ec9177b8ec9c081850744468811e708a7c9841 (diff) | |
| download | linux-895e3dceeb97855dc9990136cbb80a842fe581aa.tar.gz linux-895e3dceeb97855dc9990136cbb80a842fe581aa.tar.bz2 linux-895e3dceeb97855dc9990136cbb80a842fe581aa.zip | |
powerpc/mce: Handle UE event for memcpy_mcsafe
If we take a UE on one of the instructions with a fixup entry, set nip
to continue execution at the fixup entry. Stop processing the event
further or print it.
Co-developed-by: Reza Arbab <arbab@linux.ibm.com>
Signed-off-by: Reza Arbab <arbab@linux.ibm.com>
Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820081352.8641-6-santosh@fossix.org
Diffstat (limited to 'arch/powerpc/kernel/mce_power.c')
| -rw-r--r-- | arch/powerpc/kernel/mce_power.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c index 714a98e0927f..b6cbe3449358 100644 --- a/arch/powerpc/kernel/mce_power.c +++ b/arch/powerpc/kernel/mce_power.c @@ -11,6 +11,7 @@ #include <linux/types.h> #include <linux/ptrace.h> +#include <linux/extable.h> #include <asm/mmu.h> #include <asm/mce.h> #include <asm/machdep.h> @@ -18,6 +19,7 @@ #include <asm/pte-walk.h> #include <asm/sstep.h> #include <asm/exception-64s.h> +#include <asm/extable.h> /* * Convert an address related to an mm to a PFN. NOTE: we are in real @@ -565,9 +567,18 @@ static int mce_handle_derror(struct pt_regs *regs, return 0; } -static long mce_handle_ue_error(struct pt_regs *regs) +static long mce_handle_ue_error(struct pt_regs *regs, + struct mce_error_info *mce_err) { long handled = 0; + const struct exception_table_entry *entry; + + entry = search_kernel_exception_table(regs->nip); + if (entry) { + mce_err->ignore_event = true; + regs->nip = extable_fixup(entry); + return 1; + } /* * On specific SCOM read via MMIO we may get a machine check @@ -600,7 +611,7 @@ static long mce_handle_error(struct pt_regs *regs, &phys_addr); if (!handled && mce_err.error_type == MCE_ERROR_TYPE_UE) - handled = mce_handle_ue_error(regs); + handled = mce_handle_ue_error(regs, &mce_err); save_mce_event(regs, handled, &mce_err, regs->nip, addr, phys_addr); |