drm/amdgpu/gfx9: implement reset_hw_queue for gfx9

Using mmio to do queue reset. Enter safe mode
when writing registers.
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>

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

@@ -893,6 +893,8 @@ static int gfx_v9_0_ras_error_inject(struct amdgpu_device *adev,
 static void gfx_v9_0_reset_ras_error_count(struct amdgpu_device *adev);
 static void gfx_v9_0_update_spm_vmid_internal(struct amdgpu_device *adev,
 					      unsigned int vmid);
+static void gfx_v9_0_set_safe_mode(struct amdgpu_device *adev, int xcc_id);
+static void gfx_v9_0_unset_safe_mode(struct amdgpu_device *adev, int xcc_id);
 
 static void gfx_v9_0_kiq_set_resources(struct amdgpu_ring *kiq_ring,
 				uint64_t queue_mask)
@@ -1004,12 +1006,47 @@ static void gfx_v9_0_kiq_invalidate_tlbs(struct amdgpu_ring *kiq_ring,
 			PACKET3_INVALIDATE_TLBS_FLUSH_TYPE(flush_type));
 }
 
+
+static void gfx_v9_0_kiq_reset_hw_queue(struct amdgpu_ring *kiq_ring, uint32_t queue_type,
+					uint32_t me_id, uint32_t pipe_id, uint32_t queue_id,
+					uint32_t xcc_id, uint32_t vmid)
+{
+	struct amdgpu_device *adev = kiq_ring->adev;
+	unsigned i;
+
+	/* enter save mode */
+	gfx_v9_0_set_safe_mode(adev, xcc_id);
+	mutex_lock(&adev->srbm_mutex);
+	soc15_grbm_select(adev, me_id, pipe_id, queue_id, 0, 0);
+
+	if (queue_type == AMDGPU_RING_TYPE_COMPUTE) {
+		WREG32_SOC15(GC, 0, mmCP_HQD_DEQUEUE_REQUEST, 0x2);
+		WREG32_SOC15(GC, 0, mmSPI_COMPUTE_QUEUE_RESET, 0x1);
+		/* wait till dequeue take effects */
+		for (i = 0; i < adev->usec_timeout; i++) {
+			if (!(RREG32_SOC15(GC, 0, mmCP_HQD_ACTIVE) & 1))
+				break;
+			udelay(1);
+		}
+		if (i >= adev->usec_timeout)
+			dev_err(adev->dev, "fail to wait on hqd deactive\n");
+	} else {
+		dev_err(adev->dev, "reset queue_type(%d) not supported\n", queue_type);
+	}
+
+	soc15_grbm_select(adev, 0, 0, 0, 0, 0);
+	mutex_unlock(&adev->srbm_mutex);
+	/* exit safe mode */
+	gfx_v9_0_unset_safe_mode(adev, xcc_id);
+}
+
 static const struct kiq_pm4_funcs gfx_v9_0_kiq_pm4_funcs = {
 	.kiq_set_resources = gfx_v9_0_kiq_set_resources,
 	.kiq_map_queues = gfx_v9_0_kiq_map_queues,
 	.kiq_unmap_queues = gfx_v9_0_kiq_unmap_queues,
 	.kiq_query_status = gfx_v9_0_kiq_query_status,
 	.kiq_invalidate_tlbs = gfx_v9_0_kiq_invalidate_tlbs,
+	.kiq_reset_hw_queue = gfx_v9_0_kiq_reset_hw_queue,
 	.set_resources_size = 8,
 	.map_queues_size = 7,
 	.unmap_queues_size = 6,