[02/11] drm/etnaviv: Remove manual call to reservation_object_test_signaled_rcu before wait

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@chris-wilson.co.uk>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Russell King <linux+etnaviv@armlinux.org.uk>
Cc: Christian Gmeiner <christian.gmeiner@gmail.com>
---
 drivers/gpu/drm/etnaviv/etnaviv_gem.c | 24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

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@chris-wilson.co.uk>
> Cc: Lucas Stach <l.stach@pengutronix.de>
> Cc: Russell King <linux+etnaviv@armlinux.org.uk>
> Cc: Christian Gmeiner <christian.gmeiner@gmail.com>

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> ---
>  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
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

Hi Lucas,

On 23 September 2016 at 18:25, Daniel Vetter <daniel@ffwll.ch> wrote:
> 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@chris-wilson.co.uk>
>> Cc: Lucas Stach <l.stach@pengutronix.de>
>> Cc: Russell King <linux+etnaviv@armlinux.org.uk>
>> Cc: Christian Gmeiner <christian.gmeiner@gmail.com>
>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>
Could you please let me know if this is in your tree already, or would
you like me to take it via drm-misc (in which case, an Acked-by would
be fabulous!)

Thanks and best,
Sumit.

Am Mittwoch, den 05.10.2016, 21:45 +0530 schrieb Sumit Semwal:
> Hi Lucas,
> 
> On 23 September 2016 at 18:25, Daniel Vetter <daniel@ffwll.ch> wrote:
> > 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@chris-wilson.co.uk>
> >> Cc: Lucas Stach <l.stach@pengutronix.de>
> >> Cc: Russell King <linux+etnaviv@armlinux.org.uk>
> >> Cc: Christian Gmeiner <christian.gmeiner@gmail.com>
> >
> > Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> >
> Could you please let me know if this is in your tree already, or would
> you like me to take it via drm-misc (in which case, an Acked-by would
> be fabulous!)
> 
I haven't picked it up yet. If you are going to take the series through
drm-misc feel free to add:

Acked-by: Lucas Stach <l.stach@pengutronix.de>

Regards,
Lucas