[ Upstream commit 543ac280b3576c0009e8c0fcd4d6bfc9978d7bd0 ]
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.li...@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: a...@kernel.org
Cc: eran...@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.li...@linux.intel.com
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
arch/x86/events/intel/uncore.h | 10 ++++++++++
arch/x86/events/intel/uncore_snbep.c | 1 +
2 files changed, 11 insertions(+)
diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h
index cc6dd4f78158..42fa3974c421 100644
--- a/arch/x86/events/intel/uncore.h
+++ b/arch/x86/events/intel/uncore.h
@@ -402,6 +402,16 @@ 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 b10e04387f38..8e4e8e423839 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[] = {
--
2.20.1
