From: Lucas Stach <l.stach@pengutronix.de>
Date: Thu, 18 May 2017 18:36:14 +0200
Subject: drm/etnaviv: restore ETNA_PREP_NOSYNC behaviour
Git-commit: 46a269da7e8a1ab6510ea5c88b2732925e5efc79
Patch-mainline: v4.13-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
This reverts commit cd34db4a526c (drm/etnaviv: Remove manual call to
reservation_object_test_signaled_rcu before wait), as the patch to turn
reservation_object_wait_timeout_rcu() into
reservation_object_test_signaled_rcu() with a 0 timeout has been reverted.
This causes the driver to call into the fence wait, even with a timeout of 0
The etnaviv BO cache depends on ETNA_PREP_NOSYNC to be wait-free, even if
the BO has attached fences, so restore the behaviour for this flag.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/etnaviv/etnaviv_gem.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -411,16 +411,20 @@ int etnaviv_gem_cpu_prep(struct drm_gem_
struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
struct drm_device *dev = obj->dev;
bool write = !!(op & ETNA_PREP_WRITE);
- unsigned long remain =
- op & ETNA_PREP_NOSYNC ? 0 : etnaviv_timeout_to_jiffies(timeout);
- long lret;
+ int ret;
- 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 (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;
+ }
if (etnaviv_obj->flags & ETNA_BO_CACHED) {
if (!etnaviv_obj->sgt) {