drm/i915/pmu: Fix enable count array size and bounds checking

Enable count array is supposed to have one counter for each possible
engine sampler. As such, array sizing and bounds checking is not correct
and would blow up the asserts if more samplers were added.

No ill-effect in the current code base but lets fix it for correctness.

At the same time tidy the assert for readability and robustness.

v2:
 * One check per assert. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: b46a33e271ed ("drm/i915/pmu: Expose a PMU interface for perf queries")
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190205130353.21105-1-tvrtko.ursulin@linux.intel.com
(cherry picked from commit 26a11deea685b41a43edb513194718aa1f461c9a)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

3 files changed, 22 insertions, 11 deletions

diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index d6c8f8fdfda5..017fc602a10e 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -594,7 +594,8 @@ static void i915_pmu_enable(struct perf_event *event)
 	 * Update the bitmask of enabled events and increment
 	 * the event reference counter.
 	 */
-	GEM_BUG_ON(bit >= I915_PMU_MASK_BITS);
+	BUILD_BUG_ON(ARRAY_SIZE(i915->pmu.enable_count) != I915_PMU_MASK_BITS);
+	GEM_BUG_ON(bit >= ARRAY_SIZE(i915->pmu.enable_count));
 	GEM_BUG_ON(i915->pmu.enable_count[bit] == ~0);
 	i915->pmu.enable |= BIT_ULL(bit);
 	i915->pmu.enable_count[bit]++;
@@ -615,11 +616,16 @@ static void i915_pmu_enable(struct perf_event *event)
 		engine = intel_engine_lookup_user(i915,
 						  engine_event_class(event),
 						  engine_event_instance(event));
-		GEM_BUG_ON(!engine);
-		engine->pmu.enable |= BIT(sample);
 
-		GEM_BUG_ON(sample >= I915_PMU_SAMPLE_BITS);
+		BUILD_BUG_ON(ARRAY_SIZE(engine->pmu.enable_count) !=
+			     I915_ENGINE_SAMPLE_COUNT);
+		BUILD_BUG_ON(ARRAY_SIZE(engine->pmu.sample) !=
+			     I915_ENGINE_SAMPLE_COUNT);
+		GEM_BUG_ON(sample >= ARRAY_SIZE(engine->pmu.enable_count));
+		GEM_BUG_ON(sample >= ARRAY_SIZE(engine->pmu.sample));
 		GEM_BUG_ON(engine->pmu.enable_count[sample] == ~0);
+
+		engine->pmu.enable |= BIT(sample);
 		engine->pmu.enable_count[sample]++;
 	}
 
@@ -649,9 +655,11 @@ static void i915_pmu_disable(struct perf_event *event)
 		engine = intel_engine_lookup_user(i915,
 						  engine_event_class(event),
 						  engine_event_instance(event));
-		GEM_BUG_ON(!engine);
-		GEM_BUG_ON(sample >= I915_PMU_SAMPLE_BITS);
+
+		GEM_BUG_ON(sample >= ARRAY_SIZE(engine->pmu.enable_count));
+		GEM_BUG_ON(sample >= ARRAY_SIZE(engine->pmu.sample));
 		GEM_BUG_ON(engine->pmu.enable_count[sample] == 0);
+
 		/*
 		 * Decrement the reference count and clear the enabled
 		 * bitmask when the last listener on an event goes away.
@@ -660,7 +668,7 @@ static void i915_pmu_disable(struct perf_event *event)
 			engine->pmu.enable &= ~BIT(sample);
 	}
 
-	GEM_BUG_ON(bit >= I915_PMU_MASK_BITS);
+	GEM_BUG_ON(bit >= ARRAY_SIZE(i915->pmu.enable_count));
 	GEM_BUG_ON(i915->pmu.enable_count[bit] == 0);
 	/*
 	 * Decrement the reference count and clear the enabled
diff --git a/drivers/gpu/drm/i915/i915_pmu.h b/drivers/gpu/drm/i915/i915_pmu.h
index 7f164ca3db12..b3728c5f13e7 100644
--- a/drivers/gpu/drm/i915/i915_pmu.h
+++ b/drivers/gpu/drm/i915/i915_pmu.h
@@ -31,6 +31,8 @@ enum {
 	((1 << I915_PMU_SAMPLE_BITS) + \
 	 (I915_PMU_LAST + 1 - __I915_PMU_OTHER(0)))
 
+#define I915_ENGINE_SAMPLE_COUNT (I915_SAMPLE_SEMA + 1)
+
 struct i915_pmu_sample {
 	u64 cur;
 };
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 72edaa7ff411..a1a7cc29fdd1 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -415,16 +415,17 @@ struct intel_engine_cs {
 		/**
 		 * @enable_count: Reference count for the enabled samplers.
 		 *
-		 * Index number corresponds to the bit number from @enable.
+		 * Index number corresponds to @enum drm_i915_pmu_engine_sample.
 		 */
-		unsigned int enable_count[I915_PMU_SAMPLE_BITS];
+		unsigned int enable_count[I915_ENGINE_SAMPLE_COUNT];
 		/**
 		 * @sample: Counter values for sampling events.
 		 *
 		 * Our internal timer stores the current counters in this field.
+		 *
+		 * Index number corresponds to @enum drm_i915_pmu_engine_sample.
 		 */
-#define I915_ENGINE_SAMPLE_MAX (I915_SAMPLE_SEMA + 1)
-		struct i915_pmu_sample sample[I915_ENGINE_SAMPLE_MAX];
+		struct i915_pmu_sample sample[I915_ENGINE_SAMPLE_COUNT];
 	} pmu;
 
 	/*