On Tue, May 14, 2019 at 02:31:25PM +0200, Christian König wrote:
> Let userspace try again if we really run into a deadlock during eviction.
>
> This has a low chance of live locking, but with guaranteed forward process.
>
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> ---
> drivers/gpu/drm/ttm/ttm_bo.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index a301c876ae31..ce85cd8b4970 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -877,6 +877,8 @@ static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
> acquire_ctx);
> if (ret) {
> ttm_bo_put(first_bo);
> + if (ret == -EDEADLK)
Is this the ww_mutex EDEADLK or something else? If the former then letting
that escape unhandling into userspace sounds like a kernel bug ...
-Daniel
> + ret = -EAGAIN;
> return ret;
> }
> spin_lock(&glob->lru_lock);
> --
> 2.17.1
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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