[1/3] drm/msm/gpu: Convert retire/recover work to kthread_worker

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index 2befaf304f04..b0005ccd81c6 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -1056,7 +1056,6 @@  static void a5xx_gpmu_err_irq(struct msm_gpu *gpu)
 static void a5xx_fault_detect_irq(struct msm_gpu *gpu)
 {
 	struct drm_device *dev = gpu->dev;
-	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_ringbuffer *ring = gpu->funcs->active_ring(gpu);
 
 	DRM_DEV_ERROR(dev->dev, "gpu fault ring %d fence %x status %8.8X rb %4.4x/%4.4x ib1 %16.16llX/%4.4x ib2 %16.16llX/%4.4x\n",
@@ -1072,7 +1071,7 @@  static void a5xx_fault_detect_irq(struct msm_gpu *gpu)
 	/* Turn off the hangcheck timer to keep it from bothering us */
 	del_timer(&gpu->hangcheck_timer);
 
-	queue_work(priv->wq, &gpu->recover_work);
+	kthread_queue_work(gpu->worker, &gpu->recover_work);
 }
 
 #define RBBM_ERROR_MASK \
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
index 183de1139eeb..42eaef7ad7c7 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
@@ -78,13 +78,12 @@  static void a5xx_preempt_timer(struct timer_list *t)
 	struct a5xx_gpu *a5xx_gpu = from_timer(a5xx_gpu, t, preempt_timer);
 	struct msm_gpu *gpu = &a5xx_gpu->base.base;
 	struct drm_device *dev = gpu->dev;
-	struct msm_drm_private *priv = dev->dev_private;
 
 	if (!try_preempt_state(a5xx_gpu, PREEMPT_TRIGGERED, PREEMPT_FAULTED))
 		return;
 
 	DRM_DEV_ERROR(dev->dev, "%s: preemption timed out\n", gpu->name);
-	queue_work(priv->wq, &gpu->recover_work);
+	kthread_queue_work(gpu->worker, &gpu->recover_work);
 }
 
 /* Try to trigger a preemption switch */
@@ -162,7 +161,6 @@  void a5xx_preempt_irq(struct msm_gpu *gpu)
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
 	struct a5xx_gpu *a5xx_gpu = to_a5xx_gpu(adreno_gpu);
 	struct drm_device *dev = gpu->dev;
-	struct msm_drm_private *priv = dev->dev_private;
 
 	if (!try_preempt_state(a5xx_gpu, PREEMPT_TRIGGERED, PREEMPT_PENDING))
 		return;
@@ -181,7 +179,7 @@  void a5xx_preempt_irq(struct msm_gpu *gpu)
 		set_preempt_state(a5xx_gpu, PREEMPT_FAULTED);
 		DRM_DEV_ERROR(dev->dev, "%s: Preemption failed to complete\n",
 			gpu->name);
-		queue_work(priv->wq, &gpu->recover_work);
+		kthread_queue_work(gpu->worker, &gpu->recover_work);
 		return;
 	}
 
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 491fee410daf..e6703ae98760 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -19,8 +19,6 @@  static void a6xx_gmu_fault(struct a6xx_gmu *gmu)
 	struct a6xx_gpu *a6xx_gpu = container_of(gmu, struct a6xx_gpu, gmu);
 	struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
 	struct msm_gpu *gpu = &adreno_gpu->base;
-	struct drm_device *dev = gpu->dev;
-	struct msm_drm_private *priv = dev->dev_private;
 
 	/* FIXME: add a banner here */
 	gmu->hung = true;
@@ -29,7 +27,7 @@  static void a6xx_gmu_fault(struct a6xx_gmu *gmu)
 	del_timer(&gpu->hangcheck_timer);
 
 	/* Queue the GPU handler because we need to treat this as a recovery */
-	queue_work(priv->wq, &gpu->recover_work);
+	kthread_queue_work(gpu->worker, &gpu->recover_work);
 }
 
 static irqreturn_t a6xx_gmu_irq(int irq, void *data)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 5dddb9163bd3..2f236aadfa9c 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -965,8 +965,6 @@  static void a6xx_fault_detect_irq(struct msm_gpu *gpu)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
 	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
-	struct drm_device *dev = gpu->dev;
-	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_ringbuffer *ring = gpu->funcs->active_ring(gpu);
 
 	/*
@@ -989,7 +987,7 @@  static void a6xx_fault_detect_irq(struct msm_gpu *gpu)
 	/* Turn off the hangcheck timer to keep it from bothering us */
 	del_timer(&gpu->hangcheck_timer);
 
-	queue_work(priv->wq, &gpu->recover_work);
+	kthread_queue_work(gpu->worker, &gpu->recover_work);
 }
 
 static irqreturn_t a6xx_irq(struct msm_gpu *gpu)
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 30ba3beaad0a..7f4a9466e424 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -448,7 +448,7 @@  find_submit(struct msm_ringbuffer *ring, uint32_t fence)
 
 static void retire_submits(struct msm_gpu *gpu);
 
-static void recover_worker(struct work_struct *work)
+static void recover_worker(struct kthread_work *work)
 {
 	struct msm_gpu *gpu = container_of(work, struct msm_gpu, recover_work);
 	struct drm_device *dev = gpu->dev;
@@ -560,7 +560,6 @@  static void hangcheck_handler(struct timer_list *t)
 {
 	struct msm_gpu *gpu = from_timer(gpu, t, hangcheck_timer);
 	struct drm_device *dev = gpu->dev;
-	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_ringbuffer *ring = gpu->funcs->active_ring(gpu);
 	uint32_t fence = ring->memptrs->fence;
 
@@ -577,7 +576,7 @@  static void hangcheck_handler(struct timer_list *t)
 		DRM_DEV_ERROR(dev->dev, "%s:     submitted fence: %u\n",
 				gpu->name, ring->seqno);
 
-		queue_work(priv->wq, &gpu->recover_work);
+		kthread_queue_work(gpu->worker, &gpu->recover_work);
 	}
 
 	/* if still more pending work, reset the hangcheck timer: */
@@ -585,7 +584,7 @@  static void hangcheck_handler(struct timer_list *t)
 		hangcheck_timer_reset(gpu);
 
 	/* workaround for missing irq: */
-	queue_work(priv->wq, &gpu->retire_work);
+	kthread_queue_work(gpu->worker, &gpu->retire_work);
 }
 
 /*
@@ -760,7 +759,7 @@  static void retire_submits(struct msm_gpu *gpu)
 	}
 }
 
-static void retire_worker(struct work_struct *work)
+static void retire_worker(struct kthread_work *work)
 {
 	struct msm_gpu *gpu = container_of(work, struct msm_gpu, retire_work);
 	int i;
@@ -774,8 +773,7 @@  static void retire_worker(struct work_struct *work)
 /* call from irq handler to schedule work to retire bo's */
 void msm_gpu_retire(struct msm_gpu *gpu)
 {
-	struct msm_drm_private *priv = gpu->dev->dev_private;
-	queue_work(priv->wq, &gpu->retire_work);
+	kthread_queue_work(gpu->worker, &gpu->retire_work);
 	update_sw_cntrs(gpu);
 }
 
@@ -901,10 +899,18 @@  int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 	gpu->funcs = funcs;
 	gpu->name = name;
 
-	INIT_LIST_HEAD(&gpu->active_list);
-	INIT_WORK(&gpu->retire_work, retire_worker);
-	INIT_WORK(&gpu->recover_work, recover_worker);
+	gpu->worker = kthread_create_worker(0, "%s-worker", gpu->name);
+	if (IS_ERR(gpu->worker)) {
+		ret = PTR_ERR(gpu->worker);
+		gpu->worker = NULL;
+		goto fail;
+	}
 
+	sched_set_fifo_low(gpu->worker->task);
+
+	INIT_LIST_HEAD(&gpu->active_list);
+	kthread_init_work(&gpu->retire_work, retire_worker);
+	kthread_init_work(&gpu->recover_work, recover_worker);
 
 	timer_setup(&gpu->hangcheck_timer, hangcheck_handler, 0);
 
@@ -1037,4 +1043,8 @@  void msm_gpu_cleanup(struct msm_gpu *gpu)
 		gpu->aspace->mmu->funcs->detach(gpu->aspace->mmu);
 		msm_gem_address_space_put(gpu->aspace);
 	}
+
+	if (gpu->worker) {
+		kthread_destroy_worker(gpu->worker);
+	}
 }
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 1806e87600c0..09938ae114ec 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -106,9 +106,6 @@  struct msm_gpu {
 	/* number of GPU hangs (for all contexts) */
 	int global_faults;
 
-	/* worker for handling active-list retiring: */
-	struct work_struct retire_work;
-
 	void __iomem *mmio;
 	int irq;
 
@@ -137,7 +134,15 @@  struct msm_gpu {
 #define DRM_MSM_HANGCHECK_PERIOD 500 /* in ms */
 #define DRM_MSM_HANGCHECK_JIFFIES msecs_to_jiffies(DRM_MSM_HANGCHECK_PERIOD)
 	struct timer_list hangcheck_timer;
-	struct work_struct recover_work;
+
+	/* work for handling GPU recovery: */
+	struct kthread_work recover_work;
+
+	/* work for handling active-list retiring: */
+	struct kthread_work retire_work;
+
+	/* worker for retire/recover: */
+	struct kthread_worker *worker;
 
 	struct drm_gem_object *memptrs_bo;