amdgpu_umsch_fwlog
volatile struct amdgpu_umsch_fwlog *log_buf = fw_log_cpu_addr;
log_buf->header_size = sizeof(struct amdgpu_umsch_fwlog);
volatile struct amdgpu_umsch_fwlog *plog;
plog = (volatile struct amdgpu_umsch_fwlog *)log_buf;