AMDGPU_UMSCHFW_LOG_SIZE
r = amdgpu_bo_create_kernel(adev, AMDGPU_UMSCHFW_LOG_SIZE, PAGE_SIZE,
log_buf->buffer_size = AMDGPU_UMSCHFW_LOG_SIZE;
if (read_pos > AMDGPU_UMSCHFW_LOG_SIZE || write_pos > AMDGPU_UMSCHFW_LOG_SIZE)
read_num[0] = AMDGPU_UMSCHFW_LOG_SIZE - read_pos;
if (read_pos == AMDGPU_UMSCHFW_LOG_SIZE)
AMDGPU_UMSCHFW_LOG_SIZE);