[PATCH 6/8] drm/i915/pmu: Replace closed with registered

[Lucas De Marchi]

Since i915 calls perf_pmu_register/perf_pmu_unregister, let's call the
variable "registered" so we can flip the logic and rely on it being
false by default. Looking at other drivers, it's also more common.
Examples: arch/x86/events/intel/uncore.c and
drivers/powercap/intel_rapl_common.c.

Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/i915/i915_pmu.c | 25 +++++++++++++------------
 drivers/gpu/drm/i915/i915_pmu.h |  4 ++--
 2 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index 409e10d8190a8..e28c29bae2d9a 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -303,7 +303,7 @@ void i915_pmu_gt_parked(struct intel_gt *gt)
 {
 	struct i915_pmu *pmu = &gt->i915->pmu;
 
-	if (pmu->closed)
+	if (!pmu->registered)
 		return;
 
 	spin_lock_irq(&pmu->lock);
@@ -325,7 +325,7 @@ void i915_pmu_gt_unparked(struct intel_gt *gt)
 {
 	struct i915_pmu *pmu = &gt->i915->pmu;
 
-	if (pmu->closed)
+	if (!pmu->registered)
 		return;
 
 	spin_lock_irq(&pmu->lock);
@@ -593,7 +593,7 @@ static int i915_pmu_event_init(struct perf_event *event)
 	struct drm_i915_private *i915 = pmu_to_i915(pmu);
 	int ret;
 
-	if (pmu->closed)
+	if (!pmu->registered)
 		return -ENODEV;
 
 	if (event->attr.type != event->pmu->type)
@@ -686,7 +686,7 @@ static void i915_pmu_event_read(struct perf_event *event)
 	struct hw_perf_event *hwc = &event->hw;
 	u64 prev, new;
 
-	if (pmu->closed) {
+	if (!pmu->registered) {
 		event->hw.state = PERF_HES_STOPPED;
 		return;
 	}
@@ -812,7 +812,7 @@ static void i915_pmu_event_start(struct perf_event *event, int flags)
 {
 	struct i915_pmu *pmu = event_to_pmu(event);
 
-	if (pmu->closed)
+	if (!pmu->registered)
 		return;
 
 	i915_pmu_enable(event);
@@ -823,7 +823,7 @@ static void i915_pmu_event_stop(struct perf_event *event, int flags)
 {
 	struct i915_pmu *pmu = event_to_pmu(event);
 
-	if (pmu->closed)
+	if (!pmu->registered)
 		goto out;
 
 	if (flags & PERF_EF_UPDATE)
@@ -839,7 +839,7 @@ static int i915_pmu_event_add(struct perf_event *event, int flags)
 {
 	struct i915_pmu *pmu = event_to_pmu(event);
 
-	if (pmu->closed)
+	if (!pmu->registered)
 		return -ENODEV;
 
 	if (flags & PERF_EF_START)
@@ -1186,7 +1186,7 @@ static int i915_pmu_cpu_offline(unsigned int cpu, struct hlist_node *node)
 	 * Unregistering an instance generates a CPU offline event which we must
 	 * ignore to avoid incorrectly modifying the shared i915_pmu_cpumask.
 	 */
-	if (pmu->closed)
+	if (!pmu->registered)
 		return 0;
 
 	if (cpumask_test_and_clear_cpu(cpu, &i915_pmu_cpumask)) {
@@ -1256,8 +1256,6 @@ void i915_pmu_register(struct drm_i915_private *i915)
 	};
 	int ret = -ENOMEM;
 
-	pmu->closed = true;
-
 	if (GRAPHICS_VER(i915) <= 2) {
 		drm_info(&i915->drm, "PMU not supported for this GPU.");
 		return;
@@ -1316,7 +1314,7 @@ void i915_pmu_register(struct drm_i915_private *i915)
 	if (drmm_add_action(&i915->drm, free_pmu, pmu))
 		goto err_unreg;
 
-	pmu->closed = false;
+	pmu->registered = true;
 
 	return;
 
@@ -1337,12 +1335,15 @@ void i915_pmu_unregister(struct drm_i915_private *i915)
 {
 	struct i915_pmu *pmu = &i915->pmu;
 
+	if (!pmu->registered)
+		return;
+
 	/*
 	 * "Disconnect" the PMU callbacks - since all are atomic synchronize_rcu
 	 * ensures all currently executing ones will have exited before we
 	 * proceed with unregistration.
 	 */
-	pmu->closed = true;
+	pmu->registered = false;
 	synchronize_rcu();
 
 	hrtimer_cancel(&pmu->timer);
diff --git a/drivers/gpu/drm/i915/i915_pmu.h b/drivers/gpu/drm/i915/i915_pmu.h
index 41af038c37388..3c1cf594954d9 100644
--- a/drivers/gpu/drm/i915/i915_pmu.h
+++ b/drivers/gpu/drm/i915/i915_pmu.h
@@ -68,9 +68,9 @@ struct i915_pmu {
 	 */
 	struct pmu base;
 	/**
-	 * @closed: i915 is unregistering.
+	 * @closed: PMU is registered and not in the unregistering process.
 	 */
-	bool closed;
+	bool registered;
 	/**
 	 * @name: Name as registered with perf core.
 	 */
-- 
2.47.0