On Mon, Aug 29, 2016 at 08:08:25AM +0100, Chris Wilson wrote:
> Since fence_wait_timeout_reservation_object_wait_timeout_rcu() with a
> timeout of 0 becomes reservation_object_test_signaled_rcu(), we do not
> need to handle such conversion in the caller. The only challenge are
> those callers that wish to differentiate the error code between the
> nonblocking busy check and potentially blocking wait.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> Cc: Russell King <linux+etnaviv@xxxxxxxxxxxxxxx>
> Cc: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/gpu/drm/etnaviv/etnaviv_gem.c | 24 ++++++++++--------------
> 1 file changed, 10 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> index 5ce3603e6eac..9ffca2478e02 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> @@ -409,20 +409,16 @@ int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
> struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
> struct drm_device *dev = obj->dev;
> bool write = !!(op & ETNA_PREP_WRITE);
> - int ret;
> -
> - if (op & ETNA_PREP_NOSYNC) {
> - if (!reservation_object_test_signaled_rcu(etnaviv_obj->resv,
> - write))
> - return -EBUSY;
> - } else {
> - unsigned long remain = etnaviv_timeout_to_jiffies(timeout);
> -
> - ret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv,
> - write, true, remain);
> - if (ret <= 0)
> - return ret == 0 ? -ETIMEDOUT : ret;
> - }
> + unsigned long remain =
> + op & ETNA_PREP_NOSYNC ? 0 : etnaviv_timeout_to_jiffies(timeout);
> + long lret;
> +
> + lret = reservation_object_wait_timeout_rcu(etnaviv_obj->resv,
> + write, true, remain);
> + if (lret < 0)
> + return lret;
> + else if (lret == 0)
> + return remain == 0 ? -EBUSY : -ETIMEDOUT;
>
> if (etnaviv_obj->flags & ETNA_BO_CACHED) {
> if (!etnaviv_obj->sgt) {
> --
> 2.9.3
>
> _______________________________________________
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> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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