drm/amdgpu/gfx10: remap queue after reset successfully

Kiq command unmap_queues only does the dequeueing action.
We have to map the queue back with clean mqd.

v2: fix up error handling (Alex)

Acked-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Signed-off-by: Jiadong Zhu <Jiadong.Zhu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: jiadozhu

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

@@ -7030,13 +7030,13 @@ static int gfx_v10_0_kiq_init_queue(struct amdgpu_ring *ring)
 	return 0;
 }
 
-static int gfx_v10_0_kcq_init_queue(struct amdgpu_ring *ring)
+static int gfx_v10_0_kcq_init_queue(struct amdgpu_ring *ring, bool restore)
 {
 	struct amdgpu_device *adev = ring->adev;
 	struct v10_compute_mqd *mqd = ring->mqd_ptr;
 	int mqd_idx = ring - &adev->gfx.compute_ring[0];
 
-	if (!amdgpu_in_reset(adev) && !adev->in_suspend) {
+	if (!restore && !amdgpu_in_reset(adev) && !adev->in_suspend) {
 		memset((void *)mqd, 0, sizeof(*mqd));
 		mutex_lock(&adev->srbm_mutex);
 		nv_grbm_select(adev, ring->me, ring->pipe, ring->queue, 0);
@@ -7098,7 +7098,7 @@ static int gfx_v10_0_kcq_resume(struct amdgpu_device *adev)
 			goto done;
 		r = amdgpu_bo_kmap(ring->mqd_obj, (void **)&ring->mqd_ptr);
 		if (!r) {
-			r = gfx_v10_0_kcq_init_queue(ring);
+			r = gfx_v10_0_kcq_init_queue(ring, false);
 			amdgpu_bo_kunmap(ring->mqd_obj);
 			ring->mqd_ptr = NULL;
 		}
@@ -9483,25 +9483,49 @@ static int gfx_v10_0_reset_kcq(struct amdgpu_ring *ring,
 	spin_lock_irqsave(&kiq->ring_lock, flags);
 
 	if (amdgpu_ring_alloc(kiq_ring, kiq->pmf->unmap_queues_size)) {
-		spin_unlock_irqrestore(&kiq->ring_lock, flags);
-		return -ENOMEM;
+		r = -ENOMEM;
+		goto out;
 	}
 
 	kiq->pmf->kiq_unmap_queues(kiq_ring, ring, RESET_QUEUES,
 				   0, 0);
 	amdgpu_ring_commit(kiq_ring);
 
-	spin_unlock_irqrestore(&kiq->ring_lock, flags);
+	r = amdgpu_ring_test_ring(kiq_ring);
+	if (r)
+		goto out;
+
+	r = amdgpu_bo_reserve(ring->mqd_obj, false);
+	if (unlikely(r != 0)) {
+		dev_err(adev->dev, "fail to resv mqd_obj\n");
+		goto out;
+	}
+	r = amdgpu_bo_kmap(ring->mqd_obj, (void **)&ring->mqd_ptr);
+	if (!r) {
+		r = gfx_v10_0_kcq_init_queue(ring, true);
+		amdgpu_bo_kunmap(ring->mqd_obj);
+		ring->mqd_ptr = NULL;
+	}
+	amdgpu_bo_unreserve(ring->mqd_obj);
+	if (r) {
+		dev_err(adev->dev, "fail to unresv mqd_obj\n");
+		goto out;
+	}
+
+	if (amdgpu_ring_alloc(kiq_ring, kiq->pmf->map_queues_size)) {
+		r = -ENOMEM;
+		goto out;
+	}
+	kiq->pmf->kiq_map_queues(kiq_ring, ring);
+	amdgpu_ring_commit(kiq_ring);
 
 	r = amdgpu_ring_test_ring(kiq_ring);
+
+out:
+	spin_unlock_irqrestore(&kiq->ring_lock, flags);
 	if (r)
 		return r;
 
-	/* reset the ring */
-	ring->wptr = 0;
-	*ring->wptr_cpu_addr = 0;
-	amdgpu_ring_clear_ring(ring);
-
 	return amdgpu_ring_test_ring(ring);
 }