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| author | Kan Liang <kan.liang@linux.intel.com> | 2019-04-30 17:53:43 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-06-17 12:36:17 +0200 |
| commit | 543ac280b3576c0009e8c0fcd4d6bfc9978d7bd0 (patch) | |
| tree | bb62b6e61f94b638ad07b2e5d05218d1825c1c0c /arch/x86/events | |
| parent | faaeff98666c24376cebd0b106504d05a36881d1 (diff) | |
| download | linux-543ac280b3576c0009e8c0fcd4d6bfc9978d7bd0.tar.bz2 | |
perf/x86/intel/uncore: Handle invalid event coding for free-running counter
Counting with invalid event coding for free-running counter may cause
OOPs, e.g. uncore_iio_free_running_0/event=1/.
Current code only validate the event with free-running event format,
event=0xff,umask=0xXY. Non-free-running event format never be checked
for the PMU with free-running counters.
Add generic hw_config() to check and reject the invalid event coding
for free-running PMU.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@kernel.org
Cc: eranian@google.com
Fixes: 0f519f0352e3 ("perf/x86/intel/uncore: Support IIO free-running counters on SKX")
Link: https://lkml.kernel.org/r/1556672028-119221-2-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/events')
| -rw-r--r-- | arch/x86/events/intel/uncore.h | 10 | ||||
| -rw-r--r-- | arch/x86/events/intel/uncore_snbep.c | 1 |
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h index 33aba2504cb1..b3cad2b65766 100644 --- a/arch/x86/events/intel/uncore.h +++ b/arch/x86/events/intel/uncore.h @@ -419,6 +419,16 @@ static inline bool is_freerunning_event(struct perf_event *event) (((cfg >> 8) & 0xff) >= UNCORE_FREERUNNING_UMASK_START); } +/* Check and reject invalid config */ +static inline int uncore_freerunning_hw_config(struct intel_uncore_box *box, + struct perf_event *event) +{ + if (is_freerunning_event(event)) + return 0; + + return -EINVAL; +} + static inline void uncore_disable_box(struct intel_uncore_box *box) { if (box->pmu->type->ops->disable_box) diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c index bbe89bc589f9..fdb1a57ee1e5 100644 --- a/arch/x86/events/intel/uncore_snbep.c +++ b/arch/x86/events/intel/uncore_snbep.c @@ -3585,6 +3585,7 @@ static struct uncore_event_desc skx_uncore_iio_freerunning_events[] = { static struct intel_uncore_ops skx_uncore_iio_freerunning_ops = { .read_counter = uncore_msr_read_counter, + .hw_config = uncore_freerunning_hw_config, }; static struct attribute *skx_uncore_iio_freerunning_formats_attr[] = { |