Commit-ID: 1d899c0e9bc2a17895762b9457ac336cdee8e072
Gitweb: https://git.kernel.org/tip/1d899c0e9bc2a17895762b9457ac336cdee8e072
Author: Andrew Murray <andrew.murray@xxxxxxx>
AuthorDate: Thu, 10 Jan 2019 13:53:27 +0000
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 21 Jan 2019 11:01:22 +0100
perf/core, arch/arm: Use PERF_PMU_CAP_NO_EXCLUDE conditionally
The ARM PMU driver can be used to represent a variety of ARM based
PMUs. Some of these PMUs do not provide support for context
exclusion, where this is the case we advertise the
PERF_PMU_CAP_NO_EXCLUDE capability to ensure that perf prevents us
from handling events where any exclusion flags are set.
Where an ARM PMU driver has the set_event_filter function implemented,
we rely on it to perform exclusion checks. At present some of these
functions do not test for all of the available exclude flags.
Signed-off-by: Andrew Murray <andrew.murray@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Matt Turner <mattst88@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Richard Henderson <rth@xxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Cc: robin.murphy@xxxxxxx
Cc: suzuki.poulose@xxxxxxx
Link: https://lkml.kernel.org/r/1547128414-50693-6-git-send-email-andrew.murray@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
drivers/perf/arm_pmu.c | 15 +++++----------
1 file changed, 5 insertions(+), 10 deletions(-)
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index d0b7dd8fb184..eec75b97e7ea 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -356,13 +356,6 @@ static irqreturn_t armpmu_dispatch_irq(int irq, void *dev)
return ret;
}
-static int
-event_requires_mode_exclusion(struct perf_event_attr *attr)
-{
- return attr->exclude_idle || attr->exclude_user ||
- attr->exclude_kernel || attr->exclude_hv;
-}
-
static int
__hw_perf_event_init(struct perf_event *event)
{
@@ -393,9 +386,8 @@ __hw_perf_event_init(struct perf_event *event)
/*
* Check whether we need to exclude the counter from certain modes.
*/
- if ((!armpmu->set_event_filter ||
- armpmu->set_event_filter(hwc, &event->attr)) &&
- event_requires_mode_exclusion(&event->attr)) {
+ if (armpmu->set_event_filter &&
+ armpmu->set_event_filter(hwc, &event->attr)) {
pr_debug("ARM performance counters do not support "
"mode exclusion\n");
return -EOPNOTSUPP;
@@ -867,6 +859,9 @@ int armpmu_register(struct arm_pmu *pmu)
if (ret)
return ret;
+ if (!pmu->set_event_filter)
+ pmu->pmu.capabilities |= PERF_PMU_CAP_NO_EXCLUDE;
+
ret = perf_pmu_register(&pmu->pmu, pmu->name, -1);
if (ret)
goto out_destroy;
|