drm/amdgpu: skip GFX FED error in page fault handling

Let kfd interrupt handler process it.

v2: return 0 instead of 1 for fed error.
drop the usage of strcmp in interrupt handler.
Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -548,7 +548,7 @@ static int gmc_v9_0_process_interrupt(struct amdgpu_device *adev,
 {
 	bool retry_fault = !!(entry->src_data[1] & 0x80);
 	bool write_fault = !!(entry->src_data[1] & 0x20);
-	uint32_t status = 0, cid = 0, rw = 0;
+	uint32_t status = 0, cid = 0, rw = 0, fed = 0;
 	struct amdgpu_task_info *task_info;
 	struct amdgpu_vmhub *hub;
 	const char *mmhub_cid;
@@ -664,6 +664,14 @@ static int gmc_v9_0_process_interrupt(struct amdgpu_device *adev,
 	status = RREG32(hub->vm_l2_pro_fault_status);
 	cid = REG_GET_FIELD(status, VM_L2_PROTECTION_FAULT_STATUS, CID);
 	rw = REG_GET_FIELD(status, VM_L2_PROTECTION_FAULT_STATUS, RW);
+	fed = REG_GET_FIELD(status, VM_L2_PROTECTION_FAULT_STATUS, FED);
+
+	/* for gfx fed error, kfd will handle it, return directly */
+	if (fed && amdgpu_ras_is_poison_mode_supported(adev) &&
+	    (amdgpu_ip_version(adev, GC_HWIP, 0) >= IP_VERSION(9, 4, 2)) &&
+	    (vmhub < AMDGPU_MMHUB0_START))
+		return 0;
+
 	WREG32_P(hub->vm_l2_pro_fault_cntl, 1, ~1);
 
 	amdgpu_vm_update_fault_cache(adev, entry->pasid, addr, status, vmhub);