drm/amdgpu/gfx9: add ring reset callback

Add ring reset callback for compute.
Acked-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -7118,6 +7118,43 @@ static void gfx_v9_ring_insert_nop(struct amdgpu_ring *ring, uint32_t num_nop)
 		amdgpu_ring_write(ring, ring->funcs->nop);
 }
 
+static int gfx_v9_0_reset_kcq(struct amdgpu_ring *ring,
+			      unsigned int vmid)
+{
+	struct amdgpu_device *adev = ring->adev;
+	struct amdgpu_kiq *kiq = &adev->gfx.kiq[0];
+	struct amdgpu_ring *kiq_ring = &kiq->ring;
+	unsigned long flags;
+	int r;
+
+	if (!kiq->pmf || !kiq->pmf->kiq_unmap_queues)
+		return -EINVAL;
+
+	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;
+	}
+
+	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)
+		return r;
+
+	/* reset the ring */
+	ring->wptr = 0;
+	*ring->wptr_cpu_addr = 0;
+	amdgpu_ring_clear_ring(ring);
+
+	return amdgpu_ring_test_ring(ring);
+}
+
 static void gfx_v9_ip_print(void *handle, struct drm_printer *p)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
@@ -7364,6 +7401,7 @@ static const struct amdgpu_ring_funcs gfx_v9_0_ring_funcs_compute = {
 	.soft_recovery = gfx_v9_0_ring_soft_recovery,
 	.emit_mem_sync = gfx_v9_0_emit_mem_sync,
 	.emit_wave_limit = gfx_v9_0_emit_wave_limit,
+	.reset = gfx_v9_0_reset_kcq,
 };
 
 static const struct amdgpu_ring_funcs gfx_v9_0_ring_funcs_kiq = {