drm/amdgpu/vcn: reset fw_shared when VCPU buffers corrupted on vcn v4.0.3

It is not necessarily corrupted. When there is RAS fatal error, device
memory access is blocked. Hence vcpu bo cannot be saved to system memory
as in a regular suspend sequence before going for reset. In other full
device reset cases, that gets saved and restored during resume.

v2: Remove redundant code like vcn_v4_0 did
v2: Refine commit message
v3: Drop the volatile
v3: Refine commit message

Signed-off-by: Xiang Liu <[email protected]>
Acked-by: Christian König <[email protected]>
Reviewed-by: Stanley.Yang <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: Xiang Liu

drivers/gpu/drm/amd/amdgpu/vcn_v4_0_3.c

@@ -123,6 +123,20 @@ static int vcn_v4_0_3_early_init(struct amdgpu_ip_block *ip_block)
 	return amdgpu_vcn_early_init(adev);
 }
 
+static int vcn_v4_0_3_fw_shared_init(struct amdgpu_device *adev, int inst_idx)
+{
+	struct amdgpu_vcn4_fw_shared *fw_shared;
+
+	fw_shared = adev->vcn.inst[inst_idx].fw_shared.cpu_addr;
+	fw_shared->present_flag_0 = cpu_to_le32(AMDGPU_FW_SHARED_FLAG_0_UNIFIED_QUEUE);
+	fw_shared->sq.is_enabled = 1;
+
+	if (amdgpu_vcnfw_log)
+		amdgpu_vcn_fwlog_init(&adev->vcn.inst[inst_idx]);
+
+	return 0;
+}
+
 /**
  * vcn_v4_0_3_sw_init - sw init for VCN block
  *
@@ -155,8 +169,6 @@ static int vcn_v4_0_3_sw_init(struct amdgpu_ip_block *ip_block)
 		return r;
 
 	for (i = 0; i < adev->vcn.num_vcn_inst; i++) {
-		volatile struct amdgpu_vcn4_fw_shared *fw_shared;
-
 		vcn_inst = GET_INST(VCN, i);
 
 		ring = &adev->vcn.inst[i].ring_enc[0];
@@ -179,12 +191,7 @@ static int vcn_v4_0_3_sw_init(struct amdgpu_ip_block *ip_block)
 		if (r)
 			return r;
 
-		fw_shared = adev->vcn.inst[i].fw_shared.cpu_addr;
-		fw_shared->present_flag_0 = cpu_to_le32(AMDGPU_FW_SHARED_FLAG_0_UNIFIED_QUEUE);
-		fw_shared->sq.is_enabled = true;
-
-		if (amdgpu_vcnfw_log)
-			amdgpu_vcn_fwlog_init(&adev->vcn.inst[i]);
+		vcn_v4_0_3_fw_shared_init(adev, i);
 	}
 
 	/* TODO: Add queue reset mask when FW fully supports it */
@@ -289,6 +296,8 @@ static int vcn_v4_0_3_hw_init(struct amdgpu_ip_block *ip_block)
 		}
 	} else {
 		for (i = 0; i < adev->vcn.num_vcn_inst; ++i) {
+			struct amdgpu_vcn4_fw_shared *fw_shared;
+
 			vcn_inst = GET_INST(VCN, i);
 			ring = &adev->vcn.inst[i].ring_enc[0];
 
@@ -312,6 +321,11 @@ static int vcn_v4_0_3_hw_init(struct amdgpu_ip_block *ip_block)
 					regVCN_RB1_DB_CTRL);
 			}
 
+			/* Re-init fw_shared when RAS fatal error occurred */
+			fw_shared = adev->vcn.inst[i].fw_shared.cpu_addr;
+			if (!fw_shared->sq.is_enabled)
+				vcn_v4_0_3_fw_shared_init(adev, i);
+
 			r = amdgpu_ring_test_helper(ring);
 			if (r)
 				return r;