drm/amdgpu/swsmu: add interrupt work function

So we can schedule work from interrupts.  This might include
long tasks or things that could sleep.

Fixes: e1188aac ("drm/amdgpu/smu11: add support for SMU AC/DC interrupts")
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/inc/amdgpu_smu.h

@@ -453,6 +453,7 @@ struct smu_context
 
 	struct work_struct throttling_logging_work;
 	atomic64_t throttle_int_counter;
+	struct work_struct interrupt_work;
 
 	unsigned fan_max_rpm;
 	unsigned manual_fan_speed_rpm;
@@ -601,6 +602,7 @@ struct pptable_funcs {
 	int (*deep_sleep_control)(struct smu_context *smu, bool enablement);
 	int (*get_fan_parameters)(struct smu_context *smu);
 	int (*post_init)(struct smu_context *smu);
+	void (*interrupt_work)(struct smu_context *smu);
 };
 
 typedef enum {

drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c

@@ -780,6 +780,19 @@ static void smu_throttling_logging_work_fn(struct work_struct *work)
 	smu_log_thermal_throttling(smu);
 }
 
+static void smu_interrupt_work_fn(struct work_struct *work)
+{
+	struct smu_context *smu = container_of(work, struct smu_context,
+					       interrupt_work);
+
+	mutex_lock(&smu->mutex);
+
+	if (smu->ppt_funcs && smu->ppt_funcs->interrupt_work)
+		smu->ppt_funcs->interrupt_work(smu);
+
+	mutex_unlock(&smu->mutex);
+}
+
 static int smu_sw_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
@@ -802,6 +815,7 @@ static int smu_sw_init(void *handle)
 	mutex_init(&smu->message_lock);
 
 	INIT_WORK(&smu->throttling_logging_work, smu_throttling_logging_work_fn);
+	INIT_WORK(&smu->interrupt_work, smu_interrupt_work_fn);
 	atomic64_set(&smu->throttle_int_counter, 0);
 	smu->watermarks_bitmap = 0;
 	smu->power_profile_mode = PP_SMC_POWER_PROFILE_BOOTUP_DEFAULT;
@@ -1197,6 +1211,7 @@ static int smu_smc_hw_cleanup(struct smu_context *smu)
 	int ret = 0;
 
 	cancel_work_sync(&smu->throttling_logging_work);
+	cancel_work_sync(&smu->interrupt_work);
 
 	ret = smu_disable_thermal_alert(smu);
 	if (ret) {