perf/core, arch/x86: Use PERF_PMU_CAP_NO_EXCLUDE for exclusion incapable PMUs

For drivers that do not support context exclusion let's advertise the
PERF_PMU_CAP_NOEXCLUDE capability. This ensures that perf will
prevent us from handling events where any exclusion flags are set.
Let's also remove the now unnecessary check for exclusion flags.

PMU drivers that support at least one exclude flag won't have the
PERF_PMU_CAP_NOEXCLUDE capability set - these PMU drivers should still
check and fail on unsupported exclude flags. These missing tests are
not added in this patch.

Signed-off-by: Andrew Murray <andrew.murray@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: robin.murphy@arm.com
Cc: suzuki.poulose@arm.com
Link: https://lkml.kernel.org/r/1547128414-50693-11-git-send-email-andrew.murray@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index d50bb4dc065036181f7fc3b05182c7c8dce6b8ec..62f317c9113afc0ff252ffb4b05c82b1ac158bd6 100644 (file)
--- a/arch/x86/events/amd/ibs.c
+++ b/arch/x86/events/amd/ibs.c
@@ -253,15 +253,6 @@ static int perf_ibs_precise_event(struct perf_event *event, u64 *config)
        return -EOPNOTSUPP;
 }
 
-static const struct perf_event_attr ibs_notsupp = {
-       .exclude_user   = 1,
-       .exclude_kernel = 1,
-       .exclude_hv     = 1,
-       .exclude_idle   = 1,
-       .exclude_host   = 1,
-       .exclude_guest  = 1,
-};
-
 static int perf_ibs_init(struct perf_event *event)
 {
        struct hw_perf_event *hwc = &event->hw;
@@ -282,9 +273,6 @@ static int perf_ibs_init(struct perf_event *event)
        if (event->pmu != &perf_ibs->pmu)
                return -ENOENT;
 
-       if (perf_flags(&event->attr) & perf_flags(&ibs_notsupp))
-               return -EINVAL;
-
        if (config & ~perf_ibs->config_mask)
                return -EINVAL;
 
@@ -537,6 +525,7 @@ static struct perf_ibs perf_ibs_fetch = {
                .start          = perf_ibs_start,
                .stop           = perf_ibs_stop,
                .read           = perf_ibs_read,
+               .capabilities   = PERF_PMU_CAP_NO_EXCLUDE,
        },
        .msr                    = MSR_AMD64_IBSFETCHCTL,
        .config_mask            = IBS_FETCH_CONFIG_MASK,

diff --git a/arch/x86/events/amd/power.c b/arch/x86/events/amd/power.c
index 2aefacf5c5b2ab84ebf557fba5cb07681d7cc0ee..c5ff084551c6f25e1256560dad93324a388ddea9 100644 (file)
--- a/arch/x86/events/amd/power.c
+++ b/arch/x86/events/amd/power.c
@@ -136,14 +136,7 @@ static int pmu_event_init(struct perf_event *event)
                return -ENOENT;
 
        /* Unsupported modes and filters. */
-       if (event->attr.exclude_user   ||
-           event->attr.exclude_kernel ||
-           event->attr.exclude_hv     ||
-           event->attr.exclude_idle   ||
-           event->attr.exclude_host   ||
-           event->attr.exclude_guest  ||
-           /* no sampling */
-           event->attr.sample_period)
+       if (event->attr.sample_period)
                return -EINVAL;
 
        if (cfg != AMD_POWER_EVENTSEL_PKG)
@@ -226,6 +219,7 @@ static struct pmu pmu_class = {
        .start          = pmu_event_start,
        .stop           = pmu_event_stop,
        .read           = pmu_event_read,
+       .capabilities   = PERF_PMU_CAP_NO_EXCLUDE,
 };
 
 static int power_cpu_exit(unsigned int cpu)

diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c
index d2e780705c5a2036952417c21ba20308c54dc5c1..94a4b7fc75d0ecf344bade95be1cf563576250d2 100644 (file)
--- a/arch/x86/events/intel/cstate.c
+++ b/arch/x86/events/intel/cstate.c
@@ -280,13 +280,7 @@ static int cstate_pmu_event_init(struct perf_event *event)
                return -ENOENT;
 
        /* unsupported modes and filters */
-       if (event->attr.exclude_user   ||
-           event->attr.exclude_kernel ||
-           event->attr.exclude_hv     ||
-           event->attr.exclude_idle   ||
-           event->attr.exclude_host   ||
-           event->attr.exclude_guest  ||
-           event->attr.sample_period) /* no sampling */
+       if (event->attr.sample_period) /* no sampling */
                return -EINVAL;
 
        if (event->cpu < 0)
@@ -437,7 +431,7 @@ static struct pmu cstate_core_pmu = {
        .start          = cstate_pmu_event_start,
        .stop           = cstate_pmu_event_stop,
        .read           = cstate_pmu_event_update,
-       .capabilities   = PERF_PMU_CAP_NO_INTERRUPT,
+       .capabilities   = PERF_PMU_CAP_NO_INTERRUPT | PERF_PMU_CAP_NO_EXCLUDE,
        .module         = THIS_MODULE,
 };
 
@@ -451,7 +445,7 @@ static struct pmu cstate_pkg_pmu = {
        .start          = cstate_pmu_event_start,
        .stop           = cstate_pmu_event_stop,
        .read           = cstate_pmu_event_update,
-       .capabilities   = PERF_PMU_CAP_NO_INTERRUPT,
+       .capabilities   = PERF_PMU_CAP_NO_INTERRUPT | PERF_PMU_CAP_NO_EXCLUDE,
        .module         = THIS_MODULE,
 };
 

diff --git a/arch/x86/events/intel/rapl.c b/arch/x86/events/intel/rapl.c
index 91039ffed63334828717ac4647d2c353d95a39ab..94dc564146ca89190cc203d2b78e6651b4742f19 100644 (file)
--- a/arch/x86/events/intel/rapl.c
+++ b/arch/x86/events/intel/rapl.c
@@ -397,13 +397,7 @@ static int rapl_pmu_event_init(struct perf_event *event)
                return -EINVAL;
 
        /* unsupported modes and filters */
-       if (event->attr.exclude_user   ||
-           event->attr.exclude_kernel ||
-           event->attr.exclude_hv     ||
-           event->attr.exclude_idle   ||
-           event->attr.exclude_host   ||
-           event->attr.exclude_guest  ||
-           event->attr.sample_period) /* no sampling */
+       if (event->attr.sample_period) /* no sampling */
                return -EINVAL;
 
        /* must be done before validate_group */
@@ -699,6 +693,7 @@ static int __init init_rapl_pmus(void)
        rapl_pmus->pmu.stop             = rapl_pmu_event_stop;
        rapl_pmus->pmu.read             = rapl_pmu_event_read;
        rapl_pmus->pmu.module           = THIS_MODULE;
+       rapl_pmus->pmu.capabilities     = PERF_PMU_CAP_NO_EXCLUDE;
        return 0;
 }
 

diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c
index 2593b0d7aeee6089413d980618ce07c35d84c101..b12517fae77a505b4c4beda2cacac9ea519fd83e 100644 (file)
--- a/arch/x86/events/intel/uncore_snb.c
+++ b/arch/x86/events/intel/uncore_snb.c
@@ -397,13 +397,7 @@ static int snb_uncore_imc_event_init(struct perf_event *event)
                return -EINVAL;
 
        /* unsupported modes and filters */
-       if (event->attr.exclude_user   ||
-           event->attr.exclude_kernel ||
-           event->attr.exclude_hv     ||
-           event->attr.exclude_idle   ||
-           event->attr.exclude_host   ||
-           event->attr.exclude_guest  ||
-           event->attr.sample_period) /* no sampling */
+       if (event->attr.sample_period) /* no sampling */
                return -EINVAL;
 
        /*
@@ -497,6 +491,7 @@ static struct pmu snb_uncore_imc_pmu = {
        .start          = uncore_pmu_event_start,
        .stop           = uncore_pmu_event_stop,
        .read           = uncore_pmu_event_read,
+       .capabilities   = PERF_PMU_CAP_NO_EXCLUDE,
 };
 
 static struct intel_uncore_ops snb_uncore_imc_ops = {

diff --git a/arch/x86/events/msr.c b/arch/x86/events/msr.c
index 1b9f85abf9bc10c3b058c244b051186cbb8fd309..a878e6286e4afa0a6840d90d84f1386ee4934605 100644 (file)
--- a/arch/x86/events/msr.c
+++ b/arch/x86/events/msr.c
@@ -160,13 +160,7 @@ static int msr_event_init(struct perf_event *event)
                return -ENOENT;
 
        /* unsupported modes and filters */
-       if (event->attr.exclude_user   ||
-           event->attr.exclude_kernel ||
-           event->attr.exclude_hv     ||
-           event->attr.exclude_idle   ||
-           event->attr.exclude_host   ||
-           event->attr.exclude_guest  ||
-           event->attr.sample_period) /* no sampling */
+       if (event->attr.sample_period) /* no sampling */
                return -EINVAL;
 
        if (cfg >= PERF_MSR_EVENT_MAX)
@@ -256,7 +250,7 @@ static struct pmu pmu_msr = {
        .start          = msr_event_start,
        .stop           = msr_event_stop,
        .read           = msr_event_update,
-       .capabilities   = PERF_PMU_CAP_NO_INTERRUPT,
+       .capabilities   = PERF_PMU_CAP_NO_INTERRUPT | PERF_PMU_CAP_NO_EXCLUDE,
 };
 
 static int __init msr_init(void)