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linux-stable/arch/powerpc/platforms/powernv
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Madhavan Srinivasan 249fad734a powerpc/perf: Disable trace_imc pmu 
When a root user or a user with CAP_SYS_ADMIN privilege uses any
trace_imc performance monitoring unit events, to monitor application
or KVM threads, it may result in a checkstop (System crash).

The cause is frequent switching of the "trace/accumulation" mode of
the In-Memory Collection hardware (LDBAR).

This patch disables the trace_imc PMU unit entirely to avoid
triggering the checkstop. A future patch will reenable it at a later
stage once a workaround has been developed.

Fixes: 012ae24484 ("powerpc/perf: Trace imc PMU functions")
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Tested-by: Hariharan T.S. <hari@linux.ibm.com>
[mpe: Add pr_info_once() so dmesg shows the PMU has been disabled]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191118034452.9939-1-maddy@linux.vnet.ibm.com
2019-12-05 17:06:40 +11:00
..
copy-paste.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
eeh-powernv.c powerpc/powernv/eeh: Fix oops when probing cxl devices 2019-10-25 22:08:50 +11:00
idle.c powerpc/powernv: Access LDBAR only if ultravisor disabled 2019-08-30 09:40:16 +10:00
Kconfig powerpc/powernv: Move SCOM access code into powernv platform 2019-08-05 18:53:03 +10:00
Makefile powerpc/powernv: Add OPAL API interface to access secure variable 2019-11-13 00:33:22 +11:00
memtrace.c mm/memory_hotplug: rename walk_memory_range() and pass start+size instead of pfns 2019-07-18 17:08:06 -07:00
npu-dma.c powerpc/powernv: Fix build with IOMMU_API=n 2019-09-14 00:03:00 +10:00
ocxl.c ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action 2018-06-03 20:40:32 +10:00
opal-async.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-call.c powerpc/powernv: Add OPAL API interface to access secure variable 2019-11-13 00:33:22 +11:00
opal-core.c powerpc/opalcore: provide an option to invalidate /sys/firmware/opal/core file 2019-09-14 00:04:45 +10:00
opal-dump.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-elog.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-fadump.c powerpc/fadump: support holes in kernel boot memory area 2019-09-14 00:04:46 +10:00
opal-fadump.h powerpc/fadump: support holes in kernel boot memory area 2019-09-14 00:04:46 +10:00
opal-flash.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-hmi.c powerpc/powernv: Show checkstop reason for NPU2 HMIs 2019-06-02 19:39:36 +10:00
opal-imc.c powerpc/perf: Disable trace_imc pmu 2019-12-05 17:06:40 +11:00
opal-irqchip.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-kmsg.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-lpc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-memory-errors.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
opal-msglog.c powerpc/powernv/opal-msglog: Refactor memcons code 2019-08-30 09:40:16 +10:00
opal-nvram.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-power.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-powercap.c powerpc/powernv: Make some symbols static 2019-11-13 16:58:06 +11:00
opal-prd.c powerpc/powernv: Add new opal message type 2019-09-12 09:27:00 +10:00
opal-psr.c powerpc/powernv: Make some symbols static 2019-11-13 16:58:06 +11:00
opal-rtc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-secvar.c powerpc/powernv: Add OPAL API interface to access secure variable 2019-11-13 00:33:22 +11:00
opal-sensor-groups.c powerpc/powernv: Make some symbols static 2019-11-13 16:58:06 +11:00
opal-sensor.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
opal-sysparam.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
opal-tracepoints.c jump_label: move 'asm goto' support test to Kconfig 2019-01-06 09:46:51 +09:00
opal-wrappers.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-xscom.c powerpc/powernv: Fix checkpatch warnings in opal-xscom.c 2019-08-05 18:53:03 +10:00
opal.c Merge branch 'topic/secureboot' into next 2019-11-13 16:55:50 +11:00
pci-cxl.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
pci-ioda-tce.c powerpc/powernv/ioda: using kfree_rcu() to simplify the code 2019-11-13 16:58:07 +11:00
pci-ioda.c powerpc/powernv/npu: Fix debugfs_simple_attr.cocci warnings 2019-11-13 16:58:05 +11:00
pci.c powerpc/powernv: Disable native PCIe port management 2019-11-21 15:41:38 +11:00
pci.h powerpc/powernv/ioda2: Allocate TCE table levels on demand for default DMA window 2019-08-19 13:20:23 +10:00
powernv.h powerpc/powernv: Add ultravisor message log interface 2019-08-30 09:40:16 +10:00
rng.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
setup.c powerpc/64s/powernv: machine check dump SLB contents 2019-08-30 10:32:35 +10:00
smp.c powerpc/powernv: Fix CPU idle to be called with IRQs disabled 2019-10-29 21:47:01 +11:00
subcore-asm.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
subcore.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
subcore.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ultravisor.c powerpc/powernv: Add ultravisor message log interface 2019-08-30 09:40:16 +10:00
vas-debug.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
vas-trace.h powerpc/vas: Add a couple of trace points 2018-03-14 20:13:58 +11:00
vas-window.c powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
vas.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
vas.h powerpc updates for 5.3 2019-07-13 16:08:36 -07:00