Re: [V9 7/9] drm/amd/pm: add flood detection for wbrf events

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On 8/18/2023 8:56 AM, Evan Quan wrote:
To protect PMFW from being overloaded.

Signed-off-by: Evan Quan <evan.quan@xxxxxxx>
Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
  drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c     | 31 +++++++++++++++----
  drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h |  7 +++++
  2 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index 704442ce1da3..6c8bcdc17a15 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -1318,7 +1318,8 @@ static int smu_wbrf_event_handler(struct notifier_block *nb,
switch (action) {
  	case WBRF_CHANGED:
-		smu_wbrf_handle_exclusion_ranges(smu);
+		schedule_delayed_work(&smu->wbrf_delayed_work,
+				      msecs_to_jiffies(SMU_WBRF_EVENT_HANDLING_PACE));
  		break;
  	default:
  		return NOTIFY_DONE;
@@ -1327,6 +1328,21 @@ static int smu_wbrf_event_handler(struct notifier_block *nb,
  	return NOTIFY_OK;
  }
+/**
+ * smu_wbrf_delayed_work_handler - callback on delayed work timer expired
+ *
+ * @work: struct work_struct pointer
+ *
+ * Flood is over and driver will consume the latest exclusion ranges.
+ */
+static void smu_wbrf_delayed_work_handler(struct work_struct *work)
+{
+	struct smu_context *smu =
+		container_of(work, struct smu_context, wbrf_delayed_work.work);
+
+	smu_wbrf_handle_exclusion_ranges(smu);
+}
+
  /**
   * smu_wbrf_support_check - check wbrf support
   *
@@ -1357,12 +1373,14 @@ static void smu_wbrf_support_check(struct smu_context *smu)
   */
  static int smu_wbrf_init(struct smu_context *smu)
  {
-	struct amdgpu_device *adev = smu->adev;
  	int ret;
if (!smu->wbrf_supported)
  		return 0;
+ INIT_DELAYED_WORK(&smu->wbrf_delayed_work,
+			  smu_wbrf_delayed_work_handler);
+

This is one-time and can be part of sw_init.

Thanks,
Lijo

  	smu->wbrf_notifier.notifier_call = smu_wbrf_event_handler;
  	ret = wbrf_register_notifier(&smu->wbrf_notifier);
  	if (ret)
@@ -1373,11 +1391,10 @@ static int smu_wbrf_init(struct smu_context *smu)
  	 * before our driver loaded. To make sure our driver
  	 * is awared of those exclusion ranges.
  	 */
-	ret = smu_wbrf_handle_exclusion_ranges(smu);
-	if (ret)
-		dev_err(adev->dev, "Failed to handle wbrf exclusion ranges\n");
+	schedule_delayed_work(&smu->wbrf_delayed_work,
+			      msecs_to_jiffies(SMU_WBRF_EVENT_HANDLING_PACE));
- return ret;
+	return 0;
  }
/**
@@ -1393,6 +1410,8 @@ static void smu_wbrf_fini(struct smu_context *smu)
  		return;
wbrf_unregister_notifier(&smu->wbrf_notifier);
+
+	cancel_delayed_work_sync(&smu->wbrf_delayed_work);
  }
static int smu_smc_hw_setup(struct smu_context *smu)
diff --git a/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h b/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
index 244297979f92..4d5cb1b511e5 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
+++ b/drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h
@@ -480,6 +480,12 @@ struct stb_context {
#define WORKLOAD_POLICY_MAX 7 +/*
+ * Configure wbrf event handling pace as there can be only one
+ * event processed every SMU_WBRF_EVENT_HANDLING_PACE ms.
+ */
+#define SMU_WBRF_EVENT_HANDLING_PACE	10
+
  struct smu_context
  {
  	struct amdgpu_device            *adev;
@@ -581,6 +587,7 @@ struct smu_context
  	/* data structures for wbrf feature support */
  	bool				wbrf_supported;
  	struct notifier_block		wbrf_notifier;
+	struct delayed_work		wbrf_delayed_work;
  };
struct i2c_adapter;



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