kernel/linux.git/arch/powerpc/include/asm/mce.h, branch linux-7.0.y

powerpc/mce: Avoid using irq_work_queue() in realmode

2022-03-07T13:05:00+00:00

In realmode mce handler we use irq_work_queue() to defer the processing of mce events, irq_work_queue() can only be called when translation is enabled because it touches memory outside RMA, hence we enable translation before calling irq_work_queue and disable on return, though it is not safe to do in realmode. To avoid this, program the decrementer and call the event processing functions from timer handler. Signed-off-by: Ganesh Goudar Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220120121931.517974-1-ganeshgr@linux.ibm.com

powerpc/mce: Remove per cpu variables from MCE handlers

2021-01-31T11:35:49+00:00

Access to per-cpu variables requires translation to be enabled on pseries machine running in hash mmu mode, Since part of MCE handler runs in realmode and part of MCE handling code is shared between ppc architectures pseries and powernv, it becomes difficult to manage these variables differently on different architectures, So have these variables in paca instead of having them as per-cpu variables to avoid complications. Signed-off-by: Ganesh Goudar Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210128104143.70668-2-ganeshgr@linux.ibm.com

powerpc/mce: Reduce the size of event arrays

2021-01-31T11:35:49+00:00

Maximum recursive depth of MCE is 4, Considering the maximum depth allowed reduce the size of event to 10 from 100. This saves us ~19kB of memory and has no fatal consequences. Signed-off-by: Ganesh Goudar Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210128104143.70668-1-ganeshgr@linux.ibm.com

powerpc/64s/pseries: Add ERAT specific machine check handler

2020-12-03T14:01:23+00:00

Don't treat ERAT MCEs as SLB, don't save the SLB and use a specific ERAT flush to recover it. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20201128070728.825934-7-npiggin@gmail.com

powerpc/kernel: Cleanup machine check function declarations

2020-08-17T04:13:18+00:00

__machine_check_early_realmode_p*() are currently declared as extern in cputable.c and because of this when compiled with "C=1" (which enables semantic checker) produces these warnings. CHECK arch/powerpc/kernel/mce_power.c arch/powerpc/kernel/mce_power.c:709:6: warning: symbol '__machine_check_early_realmode_p7' was not declared. Should it be static? arch/powerpc/kernel/mce_power.c:717:6: warning: symbol '__machine_check_early_realmode_p8' was not declared. Should it be static? arch/powerpc/kernel/mce_power.c:722:6: warning: symbol '__machine_check_early_realmode_p9' was not declared. Should it be static? arch/powerpc/kernel/mce_power.c:740:6: warning: symbol '__machine_check_early_realmode_p10' was not declared. Should it be static? Patch here moves the declaration to asm/mce.h and includes the same in cputable.c Fixes: ae744f3432d3 ("powerpc/book3s: Flush SLB/TLBs if we get SLB/TLB machine check errors on power8") Fixes: 7b9f71f974a1 ("powerpc/64s: POWER9 machine check handler") Signed-off-by: Madhavan Srinivasan Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200817005618.3305028-1-maddy@linux.ibm.com

powerpc/powernv: Machine check handler for POWER10

2020-07-23T07:43:30+00:00

Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200702233343.1128026-1-npiggin@gmail.com

powerpc/mce: Add MCE notification chain

2020-07-20T12:57:56+00:00

Introduce notification chain which lets us know about uncorrected memory errors(UE). This would help prospective users in pmem or nvdimm subsystem to track bad blocks for better handling of persistent memory allocations. Signed-off-by: Santosh Sivaraj Signed-off-by: Ganesh Goudar Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200709135142.721504-1-santosh@fossix.org

powerpc/pseries: Handle UE event for memcpy_mcsafe

2020-03-27T03:59:35+00:00

memcpy_mcsafe has been implemented for power machines which is used by pmem infrastructure, so that an UE encountered during memcpy from pmem devices would not result in panic instead a right error code is returned. The implementation expects machine check handler to ignore the event and set nip to continue the execution from fixup code. Appropriate changes are already made to powernv machine check handler, make similar changes to pseries machine check handler to ignore the the event and set nip to continue execution at the fixup entry if we hit UE at an instruction with a fixup entry. while we are at it, have a common function which searches the exception table entry and updates nip with fixup address, and any future common changes can be made in this function that are valid for both architectures. powernv changes are made by commit 895e3dceeb97 ("powerpc/mce: Handle UE event for memcpy_mcsafe") Reviewed-by: Mahesh Salgaonkar Reviewed-by: Santosh S Signed-off-by: Ganesh Goudar Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200326184916.31172-1-ganeshgr@linux.ibm.com

powerpc/64s/pseries: machine check convert to use common event code

2019-08-30T00:32:35+00:00

The common machine_check_event data structures and queues are mostly platform independent, with powernv decoding SRR1/DSISR/etc., into machine_check_event objects. This patch converts pseries to use this infrastructure by decoding fwnmi/rtas data into machine_check_event objects. This allows queueing to be used by a subsequent change to delay the virtual mode handling of machine checks that occur in kernel space where it is unsafe to switch immediately to virtual mode, similarly to powernv. Signed-off-by: Nicholas Piggin [mpe: Fix implicit fallthrough warnings in mce_handle_error()] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190802105709.27696-10-npiggin@gmail.com

powerpc/mce: Handle UE event for memcpy_mcsafe

2019-08-21T12:23:48+00:00

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 Signed-off-by: Reza Arbab Signed-off-by: Balbir Singh Reviewed-by: Mahesh Salgaonkar Reviewed-by: Nicholas Piggin Signed-off-by: Santosh Sivaraj Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190820081352.8641-6-santosh@fossix.org