[PATCH V3 0/4] perf/core: Assert PERF_EVENT_FLAG_ARCH is followed

[PATCH V3 0/4] perf/core: Assert PERF_EVENT_FLAG_ARCH is followed

[Anshuman Khandual]

This series ensures that PERF_EVENT_FLAG_ARCH mask is followed correctly
while defining all the platform specific hardware event flags. But first
this expands PERF_EVENT_FLAG_ARCH with another four bits, to accommodate
some x86 platform event flags which were going beyond the existing mask.

This series applies on v6.0-rc4.

Changes in V3:

- Reworked event flags check on x86 platform as per Peter

Changes in V2:

https://lore.kernel.org/all/20220905054239.324029-1-anshuman.khandual@arm.com/

- Added first patch to expand PERF_EVENT_FLAG_ARCH
- Converted all BUILD_BUG_ON() into static_assert() 

Changes in V1:

https://lore.kernel.org/all/20220829065507.177781-1-anshuman.khandual@arm.com/

Cc: James Clark <james.clark@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-perf-users@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: x86@kernel.org

Anshuman Khandual (4):
  perf/core: Expand PERF_EVENT_FLAG_ARCH
  perf/core: Assert PERF_EVENT_FLAG_ARCH does not overlap with generic flags
  arm64/perf: Assert all platform event flags are within PERF_EVENT_FLAG_ARCH
  x86/perf: Assert all platform event flags are within PERF_EVENT_FLAG_ARCH

 arch/x86/events/perf_event.h       | 34 ++++++++++++++----------------
 arch/x86/events/perf_event_flags.h | 22 +++++++++++++++++++
 drivers/perf/arm_spe_pmu.c         |  4 +++-
 include/linux/perf/arm_pmu.h       |  9 ++++----
 include/linux/perf_event.h         |  4 +++-
 5 files changed, 49 insertions(+), 24 deletions(-)
 create mode 100644 arch/x86/events/perf_event_flags.h

-- 
2.25.1

[PATCH V3 1/4] perf/core: Expand PERF_EVENT_FLAG_ARCH

[Anshuman Khandual]

Two hardware event flags on x86 platform has overshot PERF_EVENT_FLAG_ARCH
(0x0000ffff). These flags are PERF_X86_EVENT_PEBS_LAT_HYBRID (0x20000) and
PERF_X86_EVENT_AMD_BRS (0x10000). Lets expand PERF_EVENT_FLAG_ARCH mask to
accommodate those flags, and also create room for two more in the future.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-perf-users@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 include/linux/perf_event.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index ee8b9ecdc03b..3f51fbf4a595 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -137,7 +137,7 @@ struct hw_perf_event_extra {
  * PERF_EVENT_FLAG_ARCH bits are reserved for architecture-specific
  * usage.
  */
-#define PERF_EVENT_FLAG_ARCH			0x0000ffff
+#define PERF_EVENT_FLAG_ARCH			0x000fffff
 #define PERF_EVENT_FLAG_USER_READ_CNT		0x80000000
 
 /**
-- 
2.25.1

[PATCH V3 2/4] perf/core: Assert PERF_EVENT_FLAG_ARCH does not overlap with generic flags

[Anshuman Khandual]

This just ensures that PERF_EVENT_FLAG_ARCH does not overlap with generic
hardware event flags.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-perf-users@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 include/linux/perf_event.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 3f51fbf4a595..10e23a0f9db0 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -140,6 +140,8 @@ struct hw_perf_event_extra {
 #define PERF_EVENT_FLAG_ARCH			0x000fffff
 #define PERF_EVENT_FLAG_USER_READ_CNT		0x80000000
 
+static_assert((PERF_EVENT_FLAG_USER_READ_CNT & PERF_EVENT_FLAG_ARCH) == 0);
+
 /**
  * struct hw_perf_event - performance event hardware details:
  */
-- 
2.25.1

[PATCH V3 3/4] arm64/perf: Assert all platform event flags are within PERF_EVENT_FLAG_ARCH

[Anshuman Khandual]

Ensure all platform specific event flags are within PERF_EVENT_FLAG_ARCH.

Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-perf-users@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 drivers/perf/arm_spe_pmu.c   | 4 +++-
 include/linux/perf/arm_pmu.h | 9 +++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c
index b65a7d9640e1..db8a0a841062 100644
--- a/drivers/perf/arm_spe_pmu.c
+++ b/drivers/perf/arm_spe_pmu.c
@@ -44,7 +44,9 @@
  * This allows us to perform the check, i.e, perfmon_capable(),
  * in the context of the event owner, once, during the event_init().
  */
-#define SPE_PMU_HW_FLAGS_CX			BIT(0)
+#define SPE_PMU_HW_FLAGS_CX			0x00001
+
+static_assert((PERF_EVENT_FLAG_ARCH & SPE_PMU_HW_FLAGS_CX) == SPE_PMU_HW_FLAGS_CX);
 
 static void set_spe_event_has_cx(struct perf_event *event)
 {
diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h
index 0407a38b470a..0356cb6a215d 100644
--- a/include/linux/perf/arm_pmu.h
+++ b/include/linux/perf/arm_pmu.h
@@ -24,10 +24,11 @@
 /*
  * ARM PMU hw_event flags
  */
-/* Event uses a 64bit counter */
-#define ARMPMU_EVT_64BIT		1
-/* Event uses a 47bit counter */
-#define ARMPMU_EVT_47BIT		2
+#define ARMPMU_EVT_64BIT		0x00001 /* Event uses a 64bit counter */
+#define ARMPMU_EVT_47BIT		0x00002 /* Event uses a 47bit counter */
+
+static_assert((PERF_EVENT_FLAG_ARCH & ARMPMU_EVT_64BIT) == ARMPMU_EVT_64BIT);
+static_assert((PERF_EVENT_FLAG_ARCH & ARMPMU_EVT_47BIT) == ARMPMU_EVT_47BIT);
 
 #define HW_OP_UNSUPPORTED		0xFFFF
 #define C(_x)				PERF_COUNT_HW_CACHE_##_x
-- 
2.25.1

[PATCH V3 4/4] x86/perf: Assert all platform event flags are within PERF_EVENT_FLAG_ARCH

[Anshuman Khandual]

Ensure all platform specific event flags are within PERF_EVENT_FLAG_ARCH.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: x86@kernel.org
Cc: linux-perf-users@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/x86/events/perf_event.h       | 34 ++++++++++++++----------------
 arch/x86/events/perf_event_flags.h | 22 +++++++++++++++++++
 2 files changed, 38 insertions(+), 18 deletions(-)
 create mode 100644 arch/x86/events/perf_event_flags.h

diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index ba3d24a6a4ec..60cf8132e1e1 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -64,27 +64,25 @@ static inline bool constraint_match(struct event_constraint *c, u64 ecode)
 	return ((ecode & c->cmask) - c->code) <= (u64)c->size;
 }
 
+#define PERF_ARCH(name, val)	\
+	PERF_X86_EVENT_##name = val,
+
 /*
  * struct hw_perf_event.flags flags
  */
-#define PERF_X86_EVENT_PEBS_LDLAT	0x00001 /* ld+ldlat data address sampling */
-#define PERF_X86_EVENT_PEBS_ST		0x00002 /* st data address sampling */
-#define PERF_X86_EVENT_PEBS_ST_HSW	0x00004 /* haswell style datala, store */
-#define PERF_X86_EVENT_PEBS_LD_HSW	0x00008 /* haswell style datala, load */
-#define PERF_X86_EVENT_PEBS_NA_HSW	0x00010 /* haswell style datala, unknown */
-#define PERF_X86_EVENT_EXCL		0x00020 /* HT exclusivity on counter */
-#define PERF_X86_EVENT_DYNAMIC		0x00040 /* dynamic alloc'd constraint */
-
-#define PERF_X86_EVENT_EXCL_ACCT	0x00100 /* accounted EXCL event */
-#define PERF_X86_EVENT_AUTO_RELOAD	0x00200 /* use PEBS auto-reload */
-#define PERF_X86_EVENT_LARGE_PEBS	0x00400 /* use large PEBS */
-#define PERF_X86_EVENT_PEBS_VIA_PT	0x00800 /* use PT buffer for PEBS */
-#define PERF_X86_EVENT_PAIR		0x01000 /* Large Increment per Cycle */
-#define PERF_X86_EVENT_LBR_SELECT	0x02000 /* Save/Restore MSR_LBR_SELECT */
-#define PERF_X86_EVENT_TOPDOWN		0x04000 /* Count Topdown slots/metrics events */
-#define PERF_X86_EVENT_PEBS_STLAT	0x08000 /* st+stlat data address sampling */
-#define PERF_X86_EVENT_AMD_BRS		0x10000 /* AMD Branch Sampling */
-#define PERF_X86_EVENT_PEBS_LAT_HYBRID	0x20000 /* ld and st lat for hybrid */
+enum {
+#include "perf_event_flags.h"
+};
+
+#undef PERF_ARCH
+
+#define PERF_ARCH(name, val)						\
+	static_assert((PERF_X86_EVENT_##name & PERF_EVENT_FLAG_ARCH) ==	\
+		      PERF_X86_EVENT_##name);
+
+#include "perf_event_flags.h"
+
+#undef PERF_ARCH
 
 static inline bool is_topdown_count(struct perf_event *event)
 {
diff --git a/arch/x86/events/perf_event_flags.h b/arch/x86/events/perf_event_flags.h
new file mode 100644
index 000000000000..1dc19b9b4426
--- /dev/null
+++ b/arch/x86/events/perf_event_flags.h
@@ -0,0 +1,22 @@
+
+/*
+ * struct hw_perf_event.flags flags
+ */
+PERF_ARCH(PEBS_LDLAT,		0x00001) /* ld+ldlat data address sampling */
+PERF_ARCH(PEBS_ST,		0x00002) /* st data address sampling */
+PERF_ARCH(PEBS_ST_HSW,		0x00004) /* haswell style datala, store */
+PERF_ARCH(PEBS_LD_HSW,		0x00008) /* haswell style datala, load */
+PERF_ARCH(PEBS_NA_HSW,		0x00010) /* haswell style datala, unknown */
+PERF_ARCH(EXCL,			0x00020) /* HT exclusivity on counter */
+PERF_ARCH(DYNAMIC,		0x00040) /* dynamic alloc'd constraint */
+			/*	0x00080	*/
+PERF_ARCH(EXCL_ACCT,		0x00100) /* accounted EXCL event */
+PERF_ARCH(AUTO_RELOAD,		0x00200) /* use PEBS auto-reload */
+PERF_ARCH(LARGE_PEBS,		0x00400) /* use large PEBS */
+PERF_ARCH(PEBS_VIA_PT,		0x00800) /* use PT buffer for PEBS */
+PERF_ARCH(PAIR,			0x01000) /* Large Increment per Cycle */
+PERF_ARCH(LBR_SELECT,		0x02000) /* Save/Restore MSR_LBR_SELECT */
+PERF_ARCH(TOPDOWN,		0x04000) /* Count Topdown slots/metrics events */
+PERF_ARCH(PEBS_STLAT,		0x08000) /* st+stlat data address sampling */
+PERF_ARCH(AMD_BRS,		0x10000) /* AMD Branch Sampling */
+PERF_ARCH(PEBS_LAT_HYBRID,	0x20000) /* ld and st lat for hybrid */
-- 
2.25.1