[PATCH V5 7/9] drm/amd/pm: add flood detection for wbrf events

From: Evan Quan <evan.quan@amd.com>
To: <rafael@kernel.org>, <lenb@kernel.org>,
	<Alexander.Deucher@amd.com>, <Christian.Koenig@amd.com>,
	<Xinhui.Pan@amd.com>, <airlied@gmail.com>, <daniel@ffwll.ch>,
	<johannes@sipsolutions.net>, <davem@davemloft.net>,
	<edumazet@google.com>, <kuba@kernel.org>, <pabeni@redhat.com>,
	<Mario.Limonciello@amd.com>, <mdaenzer@redhat.com>,
	<maarten.lankhorst@linux.intel.com>, <tzimmermann@suse.de>,
	<hdegoede@redhat.com>, <jingyuwang_vip@163.com>,
	<Lijo.Lazar@amd.com>, <jim.cromie@gmail.com>,
	<bellosilicio@gmail.com>, <andrealmeid@igalia.com>,
	<trix@redhat.com>, <jsg@jsg.id.au>, <arnd@arndb.de>
Cc: <linux-kernel@vger.kernel.org>, <linux-acpi@vger.kernel.org>,
	<amd-gfx@lists.freedesktop.org>,
	<dri-devel@lists.freedesktop.org>,
	<linux-wireless@vger.kernel.org>, <netdev@vger.kernel.org>,
	Evan Quan <evan.quan@amd.com>,
	Mario Limonciello <mario.limonciello@amd.com>
Subject: [PATCH V5 7/9] drm/amd/pm: add flood detection for wbrf events
Date: Fri, 30 Jun 2023 18:32:38 +0800	[thread overview]
Message-ID: <20230630103240.1557100-8-evan.quan@amd.com> (raw)
In-Reply-To: <20230630103240.1557100-1-evan.quan@amd.com>

To protect PMFW from being overloaded.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
---
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c     | 30 +++++++++++++++----
 drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h |  7 +++++
 2 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index 83d428e890df..a4cfaf8a6f59 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -1278,7 +1278,8 @@ 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;
@@ -1287,6 +1288,21 @@ 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
  *
@@ -1323,6 +1339,9 @@ static int smu_wbrf_init(struct smu_context *smu)
 	if (!smu->wbrf_supported)
 		return 0;
 
+	INIT_DELAYED_WORK(&smu->wbrf_delayed_work,
+			  smu_wbrf_delayed_work_handler);
+
 	smu->wbrf_notifier.notifier_call = smu_wbrf_event_handler;
 	ret = wbrf_register_notifier(&smu->wbrf_notifier);
 	if (ret)
@@ -1333,11 +1352,10 @@ 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;
 }
 
 /**
@@ -1353,6 +1371,8 @@ 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 5b2343cfc69b..5df28d4a8c30 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;
@@ -579,6 +585,7 @@ 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;
-- 
2.34.1

