drm/amdgpu: drop error return from flush_gpu_tlb_pasid

That function never fails, drop the error return.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -645,9 +645,10 @@ int amdgpu_gmc_flush_gpu_tlb_pasid(struct amdgpu_device *adev, uint16_t pasid,
 
 	if (!adev->gmc.flush_pasid_uses_kiq || !ring->sched.ready ||
 	    !down_read_trylock(&adev->reset_domain->sem)) {
-		return adev->gmc.gmc_funcs->flush_gpu_tlb_pasid(adev, pasid,
-								flush_type,
-								all_hub, inst);
+		adev->gmc.gmc_funcs->flush_gpu_tlb_pasid(adev, pasid,
+							 flush_type, all_hub,
+							 inst);
+		return 0;
 	}
 
 	/* 2 dwords flush + 8 dwords fence */

drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h

@@ -130,9 +130,9 @@ struct amdgpu_gmc_funcs {
 	void (*flush_gpu_tlb)(struct amdgpu_device *adev, uint32_t vmid,
 				uint32_t vmhub, uint32_t flush_type);
 	/* flush the vm tlb via pasid */
-	int (*flush_gpu_tlb_pasid)(struct amdgpu_device *adev, uint16_t pasid,
-					uint32_t flush_type, bool all_hub,
-					uint32_t inst);
+	void (*flush_gpu_tlb_pasid)(struct amdgpu_device *adev, uint16_t pasid,
+				    uint32_t flush_type, bool all_hub,
+				    uint32_t inst);
 	/* flush the vm tlb via ring */
 	uint64_t (*emit_flush_gpu_tlb)(struct amdgpu_ring *ring, unsigned vmid,
 				       uint64_t pd_addr);

drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c

@@ -339,9 +339,9 @@ static void gmc_v10_0_flush_gpu_tlb(struct amdgpu_device *adev, uint32_t vmid,
  *
  * Flush the TLB for the requested pasid.
  */
-static int gmc_v10_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
-					uint16_t pasid, uint32_t flush_type,
-					bool all_hub, uint32_t inst)
+static void gmc_v10_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
+					  uint16_t pasid, uint32_t flush_type,
+					  bool all_hub, uint32_t inst)
 {
 	uint16_t queried;
 	int vmid, i;
@@ -364,7 +364,6 @@ static int gmc_v10_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
 						flush_type);
 		}
 	}
-	return 0;
 }
 
 static uint64_t gmc_v10_0_emit_flush_gpu_tlb(struct amdgpu_ring *ring,

drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c

@@ -299,9 +299,9 @@ static void gmc_v11_0_flush_gpu_tlb(struct amdgpu_device *adev, uint32_t vmid,
  *
  * Flush the TLB for the requested pasid.
  */
-static int gmc_v11_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
-					uint16_t pasid, uint32_t flush_type,
-					bool all_hub, uint32_t inst)
+static void gmc_v11_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
+					  uint16_t pasid, uint32_t flush_type,
+					  bool all_hub, uint32_t inst)
 {
 	uint16_t queried;
 	int vmid, i;
@@ -324,7 +324,6 @@ static int gmc_v11_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
 						flush_type);
 		}
 	}
-	return 0;
 }
 
 static uint64_t gmc_v11_0_emit_flush_gpu_tlb(struct amdgpu_ring *ring,

drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c

@@ -423,15 +423,15 @@ static int gmc_v7_0_mc_init(struct amdgpu_device *adev)
  *
  * Flush the TLB for the requested pasid.
  */
-static int gmc_v7_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
-					uint16_t pasid, uint32_t flush_type,
-					bool all_hub, uint32_t inst)
+static void gmc_v7_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
+					 uint16_t pasid, uint32_t flush_type,
+					 bool all_hub, uint32_t inst)
 {
 	u32 mask = 0x0;
 	int vmid;
 
 	if (!down_read_trylock(&adev->reset_domain->sem))
-		return 0;
+		return;
 
 	for (vmid = 1; vmid < 16; vmid++) {
 		u32 tmp = RREG32(mmATC_VMID0_PASID_MAPPING + vmid);
@@ -444,7 +444,6 @@ static int gmc_v7_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
 	WREG32(mmVM_INVALIDATE_REQUEST, mask);
 	RREG32(mmVM_INVALIDATE_RESPONSE);
 	up_read(&adev->reset_domain->sem);
-	return 0;
 }
 
 /*

drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c

@@ -613,15 +613,15 @@ static int gmc_v8_0_mc_init(struct amdgpu_device *adev)
  *
  * Flush the TLB for the requested pasid.
  */
-static int gmc_v8_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
-					uint16_t pasid, uint32_t flush_type,
-					bool all_hub, uint32_t inst)
+static void gmc_v8_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
+					 uint16_t pasid, uint32_t flush_type,
+					 bool all_hub, uint32_t inst)
 {
 	u32 mask = 0x0;
 	int vmid;
 
 	if (!down_read_trylock(&adev->reset_domain->sem))
-		return 0;
+		return;
 
 	for (vmid = 1; vmid < 16; vmid++) {
 		u32 tmp = RREG32(mmATC_VMID0_PASID_MAPPING + vmid);
@@ -634,7 +634,6 @@ static int gmc_v8_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
 	WREG32(mmVM_INVALIDATE_REQUEST, mask);
 	RREG32(mmVM_INVALIDATE_RESPONSE);
 	up_read(&adev->reset_domain->sem);
-	return 0;
 }
 
 /*

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

@@ -952,9 +952,9 @@ static void gmc_v9_0_flush_gpu_tlb(struct amdgpu_device *adev, uint32_t vmid,
  *
  * Flush the TLB for the requested pasid.
  */
-static int gmc_v9_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
-					uint16_t pasid, uint32_t flush_type,
-					bool all_hub, uint32_t inst)
+static void gmc_v9_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
+					 uint16_t pasid, uint32_t flush_type,
+					 bool all_hub, uint32_t inst)
 {
 	uint16_t queried;
 	int i, vmid;
@@ -978,8 +978,6 @@ static int gmc_v9_0_flush_gpu_tlb_pasid(struct amdgpu_device *adev,
 					       flush_type);
 		}
 	}
-
-	return 0;
 }
 
 static uint64_t gmc_v9_0_emit_flush_gpu_tlb(struct amdgpu_ring *ring,