ARM: perf: don't pretend to support counting of L1I writes

ARM has a harvard cache architecture and cannot write directly to the
I-side.

This patch removes the L1I write events from the cache map (which
previously returned *read* events in many cases).

Reported-by: Mike Williams <michael.williams@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/arch/arm/kernel/perf_event_v6.c b/arch/arm/kernel/perf_event_v6.c
index 041d052..03664b0 100644 (file)
--- a/arch/arm/kernel/perf_event_v6.c
+++ b/arch/arm/kernel/perf_event_v6.c
@@ -106,7 +106,7 @@ static const unsigned armv6_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                },
                [C(OP_WRITE)] = {
                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
-                       [C(RESULT_MISS)]        = ARMV6_PERFCTR_ICACHE_MISS,
+                       [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
                },
                [C(OP_PREFETCH)] = {
                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
@@ -259,7 +259,7 @@ static const unsigned armv6mpcore_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                },
                [C(OP_WRITE)] = {
                        [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,
-                       [C(RESULT_MISS)]    = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
+                       [C(RESULT_MISS)]    = CACHE_OP_UNSUPPORTED,
                },
                [C(OP_PREFETCH)] = {
                        [C(RESULT_ACCESS)]  = CACHE_OP_UNSUPPORTED,

diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c
index 4fbc757..8c79a9e 100644 (file)
--- a/arch/arm/kernel/perf_event_v7.c
+++ b/arch/arm/kernel/perf_event_v7.c
@@ -157,8 +157,8 @@ static const unsigned armv7_a8_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                        [C(RESULT_MISS)]        = ARMV7_PERFCTR_L1_ICACHE_REFILL,
                },
                [C(OP_WRITE)] = {
-                       [C(RESULT_ACCESS)]      = ARMV7_A8_PERFCTR_L1_ICACHE_ACCESS,
-                       [C(RESULT_MISS)]        = ARMV7_PERFCTR_L1_ICACHE_REFILL,
+                       [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                       [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
                },
                [C(OP_PREFETCH)] = {
                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
@@ -282,7 +282,7 @@ static const unsigned armv7_a9_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                },
                [C(OP_WRITE)] = {
                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
-                       [C(RESULT_MISS)]        = ARMV7_PERFCTR_L1_ICACHE_REFILL,
+                       [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
                },
                [C(OP_PREFETCH)] = {
                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
@@ -399,8 +399,8 @@ static const unsigned armv7_a5_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                        [C(RESULT_MISS)]        = ARMV7_PERFCTR_L1_ICACHE_REFILL,
                },
                [C(OP_WRITE)] = {
-                       [C(RESULT_ACCESS)]      = ARMV7_PERFCTR_L1_ICACHE_ACCESS,
-                       [C(RESULT_MISS)]        = ARMV7_PERFCTR_L1_ICACHE_REFILL,
+                       [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                       [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
                },
                /*
                 * The prefetch counters don't differentiate between the I
@@ -527,8 +527,8 @@ static const unsigned armv7_a15_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                        [C(RESULT_MISS)]        = ARMV7_PERFCTR_L1_ICACHE_REFILL,
                },
                [C(OP_WRITE)] = {
-                       [C(RESULT_ACCESS)]      = ARMV7_PERFCTR_L1_ICACHE_ACCESS,
-                       [C(RESULT_MISS)]        = ARMV7_PERFCTR_L1_ICACHE_REFILL,
+                       [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                       [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
                },
                [C(OP_PREFETCH)] = {
                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
@@ -651,8 +651,8 @@ static const unsigned armv7_a7_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                        [C(RESULT_MISS)]        = ARMV7_PERFCTR_L1_ICACHE_REFILL,
                },
                [C(OP_WRITE)] = {
-                       [C(RESULT_ACCESS)]      = ARMV7_PERFCTR_L1_ICACHE_ACCESS,
-                       [C(RESULT_MISS)]        = ARMV7_PERFCTR_L1_ICACHE_REFILL,
+                       [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                       [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
                },
                [C(OP_PREFETCH)] = {
                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,

diff --git a/arch/arm/kernel/perf_event_xscale.c b/arch/arm/kernel/perf_event_xscale.c
index 2b0fe30..63990c4 100644 (file)
--- a/arch/arm/kernel/perf_event_xscale.c
+++ b/arch/arm/kernel/perf_event_xscale.c
@@ -83,7 +83,7 @@ static const unsigned xscale_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
                },
                [C(OP_WRITE)] = {
                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
-                       [C(RESULT_MISS)]        = XSCALE_PERFCTR_ICACHE_MISS,
+                       [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
                },
                [C(OP_PREFETCH)] = {
                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,