drm/i915/pmu: avoid an maybe-uninitialized warning

Conditional spinlocks make it hard for gcc and for lockdep to
follow the code flow. This one causes a warning with at least
gcc-9 and higher:

In file included from include/linux/irq.h:14,
                 from drivers/gpu/drm/i915/i915_pmu.c:7:
drivers/gpu/drm/i915/i915_pmu.c: In function 'i915_sample':
include/linux/spinlock.h:289:3: error: 'flags' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  289 |   _raw_spin_unlock_irqrestore(lock, flags); \
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/i915/i915_pmu.c:288:17: note: 'flags' was declared here
  288 |   unsigned long flags;
      |                 ^~~~~

Split out the part between the locks into a separate function
for readability and to let the compiler figure out what the
logic actually is.

Fixes: d79e1bd6 ("drm/i915/pmu: Only use exclusive mmio access for gen7")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200527140526.1458215-1-arnd@arndb.de

drivers/gpu/drm/i915/i915_pmu.c

@@ -269,39 +269,15 @@ static bool exclusive_mmio_access(const struct drm_i915_private *i915)
 	return IS_GEN(i915, 7);
 }
 
-static void
-engines_sample(struct intel_gt *gt, unsigned int period_ns)
+static void engine_sample(struct intel_engine_cs *engine, unsigned int period_ns)
 {
-	struct drm_i915_private *i915 = gt->i915;
-	struct intel_engine_cs *engine;
-	enum intel_engine_id id;
-
-	if ((i915->pmu.enable & ENGINE_SAMPLE_MASK) == 0)
-		return;
-
-	if (!intel_gt_pm_is_awake(gt))
-		return;
-
-	for_each_engine(engine, gt, id) {
 	struct intel_engine_pmu *pmu = &engine->pmu;
-		spinlock_t *mmio_lock;
-		unsigned long flags;
 	bool busy;
 	u32 val;
 
-		if (!intel_engine_pm_get_if_awake(engine))
-			continue;
-
-		mmio_lock = NULL;
-		if (exclusive_mmio_access(i915))
-			mmio_lock = &engine->uncore->lock;
-
-		if (unlikely(mmio_lock))
-			spin_lock_irqsave(mmio_lock, flags);
-
 	val = ENGINE_READ_FW(engine, RING_CTL);
 	if (val == 0) /* powerwell off => engine idle */
-			goto skip;
+		return;
 
 	if (val & RING_WAIT)
 		add_sample(&pmu->sample[I915_SAMPLE_WAIT], period_ns);
@@ -310,7 +286,7 @@ engines_sample(struct intel_gt *gt, unsigned int period_ns)
 
 	/* No need to sample when busy stats are supported. */
 	if (intel_engine_supports_stats(engine))
-			goto skip;
+		return;
 
 	/*
 	 * While waiting on a semaphore or event, MI_MODE reports the
@@ -326,10 +302,34 @@ engines_sample(struct intel_gt *gt, unsigned int period_ns)
 	}
 	if (busy)
 		add_sample(&pmu->sample[I915_SAMPLE_BUSY], period_ns);
+}
+
+static void
+engines_sample(struct intel_gt *gt, unsigned int period_ns)
+{
+	struct drm_i915_private *i915 = gt->i915;
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	unsigned long flags;
+
+	if ((i915->pmu.enable & ENGINE_SAMPLE_MASK) == 0)
+		return;
+
+	if (!intel_gt_pm_is_awake(gt))
+		return;
+
+	for_each_engine(engine, gt, id) {
+		if (!intel_engine_pm_get_if_awake(engine))
+			continue;
+
+		if (exclusive_mmio_access(i915)) {
+			spin_lock_irqsave(&engine->uncore->lock, flags);
+			engine_sample(engine, period_ns);
+			spin_unlock_irqrestore(&engine->uncore->lock, flags);
+		} else {
+			engine_sample(engine, period_ns);
+		}
 
-skip:
-		if (unlikely(mmio_lock))
-			spin_unlock_irqrestore(mmio_lock, flags);
 		intel_engine_pm_put_async(engine);
 	}
 }