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Kan Liang e321d02db8 perf/x86: Disable extended registers for non-supported PMUs 
The perf fuzzer caused Skylake machine to crash:

[ 9680.085831] Call Trace:
[ 9680.088301]  <IRQ>
[ 9680.090363]  perf_output_sample_regs+0x43/0xa0
[ 9680.094928]  perf_output_sample+0x3aa/0x7a0
[ 9680.099181]  perf_event_output_forward+0x53/0x80
[ 9680.103917]  __perf_event_overflow+0x52/0xf0
[ 9680.108266]  ? perf_trace_run_bpf_submit+0xc0/0xc0
[ 9680.113108]  perf_swevent_hrtimer+0xe2/0x150
[ 9680.117475]  ? check_preempt_wakeup+0x181/0x230
[ 9680.122091]  ? check_preempt_curr+0x62/0x90
[ 9680.126361]  ? ttwu_do_wakeup+0x19/0x140
[ 9680.130355]  ? try_to_wake_up+0x54/0x460
[ 9680.134366]  ? reweight_entity+0x15b/0x1a0
[ 9680.138559]  ? __queue_work+0x103/0x3f0
[ 9680.142472]  ? update_dl_rq_load_avg+0x1cd/0x270
[ 9680.147194]  ? timerqueue_del+0x1e/0x40
[ 9680.151092]  ? __remove_hrtimer+0x35/0x70
[ 9680.155191]  __hrtimer_run_queues+0x100/0x280
[ 9680.159658]  hrtimer_interrupt+0x100/0x220
[ 9680.163835]  smp_apic_timer_interrupt+0x6a/0x140
[ 9680.168555]  apic_timer_interrupt+0xf/0x20
[ 9680.172756]  </IRQ>

The XMM registers can only be collected by PEBS hardware events on the
platforms with PEBS baseline support, e.g. Icelake, not software/probe
events.

Add capabilities flag PERF_PMU_CAP_EXTENDED_REGS to indicate the PMU
which support extended registers. For X86, the extended registers are
XMM registers.

Add has_extended_regs() to check if extended registers are applied.

The generic code define the mask of extended registers as 0 if arch
headers haven't overridden it.

Originally-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 878068ea27 ("perf/x86: Support outputting XMM registers")
Link: https://lkml.kernel.org/r/1559081314-9714-1-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
 		2019-06-24 19:19:23 +02:00
..
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
callchain.c perf/core: Convert to SPDX license identifiers 2019-02-04 08:46:11 +01:00
core.c perf/x86: Disable extended registers for non-supported PMUs 2019-06-24 19:19:23 +02:00
hw_breakpoint.c perf/hw_breakpoints: Convert to SPDX license identifier 2019-02-04 08:46:13 +01:00
internal.h perf/ring-buffer: Use regular variables for nesting 2019-05-24 09:00:11 +02:00
ring_buffer.c perf/ring-buffer: Use regular variables for nesting 2019-05-24 09:00:11 +02:00
uprobes.c mm/mmu_notifier: use correct mmu_notifier events for each invalidation 2019-05-14 09:47:49 -07:00