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charset="utf-8" From: Rob Clark If the callback is going to have to attempt to grab more locks, it is useful to have an ww_acquire_ctx to avoid locking order problems. Why not use the drm_exec helper instead? Mainly because (a) where ww_acquire_init() is called is awkward, and (b) we don't really need to retry after backoff, we can just move on to the next object. Signed-off-by: Rob Clark Signed-off-by: Rob Clark Tested-by: Antonino Maniscalco Reviewed-by: Antonino Maniscalco --- drivers/gpu/drm/drm_gem.c | 14 +++++++++++--- drivers/gpu/drm/msm/msm_gem_shrinker.c | 24 +++++++++++++----------- include/drm/drm_gem.h | 10 ++++++---- 3 files changed, 30 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 1e659d2660f7..95158cd7145e 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -1460,12 +1460,14 @@ EXPORT_SYMBOL(drm_gem_lru_move_tail); * @nr_to_scan: The number of pages to try to reclaim * @remaining: The number of pages left to reclaim, should be initialized = by caller * @shrink: Callback to try to shrink/reclaim the object. + * @ticket: Optional ww_acquire_ctx context to use for locking */ unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru, unsigned int nr_to_scan, unsigned long *remaining, - bool (*shrink)(struct drm_gem_object *obj)) + bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticke= t), + struct ww_acquire_ctx *ticket) { struct drm_gem_lru still_in_lru; struct drm_gem_object *obj; @@ -1498,17 +1500,20 @@ drm_gem_lru_scan(struct drm_gem_lru *lru, */ mutex_unlock(lru->lock); =20 + if (ticket) + ww_acquire_init(ticket, &reservation_ww_class); + /* * Note that this still needs to be trylock, since we can * hit shrinker in response to trying to get backing pages * for this obj (ie. while it's lock is already held) */ - if (!dma_resv_trylock(obj->resv)) { + if (!ww_mutex_trylock(&obj->resv->lock, ticket)) { *remaining +=3D obj->size >> PAGE_SHIFT; goto tail; } =20 - if (shrink(obj)) { + if (shrink(obj, ticket)) { freed +=3D obj->size >> PAGE_SHIFT; =20 /* @@ -1522,6 +1527,9 @@ drm_gem_lru_scan(struct drm_gem_lru *lru, =20 dma_resv_unlock(obj->resv); =20 + if (ticket) + ww_acquire_fini(ticket); + tail: drm_gem_object_put(obj); mutex_lock(lru->lock); diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/m= sm_gem_shrinker.c index 07ca4ddfe4e3..de185fc34084 100644 --- a/drivers/gpu/drm/msm/msm_gem_shrinker.c +++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c @@ -44,7 +44,7 @@ msm_gem_shrinker_count(struct shrinker *shrinker, struct = shrink_control *sc) } =20 static bool -purge(struct drm_gem_object *obj) +purge(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket) { if (!is_purgeable(to_msm_bo(obj))) return false; @@ -58,7 +58,7 @@ purge(struct drm_gem_object *obj) } =20 static bool -evict(struct drm_gem_object *obj) +evict(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket) { if (is_unevictable(to_msm_bo(obj))) return false; @@ -79,21 +79,21 @@ wait_for_idle(struct drm_gem_object *obj) } =20 static bool -active_purge(struct drm_gem_object *obj) +active_purge(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket) { if (!wait_for_idle(obj)) return false; =20 - return purge(obj); + return purge(obj, ticket); } =20 static bool -active_evict(struct drm_gem_object *obj) +active_evict(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket) { if (!wait_for_idle(obj)) return false; =20 - return evict(obj); + return evict(obj, ticket); } =20 static unsigned long @@ -102,7 +102,7 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct= shrink_control *sc) struct msm_drm_private *priv =3D shrinker->private_data; struct { struct drm_gem_lru *lru; - bool (*shrink)(struct drm_gem_object *obj); + bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket= ); bool cond; unsigned long freed; unsigned long remaining; @@ -122,8 +122,9 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct= shrink_control *sc) continue; stages[i].freed =3D drm_gem_lru_scan(stages[i].lru, nr, - &stages[i].remaining, - stages[i].shrink); + &stages[i].remaining, + stages[i].shrink, + NULL); nr -=3D stages[i].freed; freed +=3D stages[i].freed; remaining +=3D stages[i].remaining; @@ -164,7 +165,7 @@ msm_gem_shrinker_shrink(struct drm_device *dev, unsigne= d long nr_to_scan) static const int vmap_shrink_limit =3D 15; =20 static bool -vmap_shrink(struct drm_gem_object *obj) +vmap_shrink(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket) { if (!is_vunmapable(to_msm_bo(obj))) return false; @@ -192,7 +193,8 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsign= ed long event, void *ptr) unmapped +=3D drm_gem_lru_scan(lrus[idx], vmap_shrink_limit - unmapped, &remaining, - vmap_shrink); + vmap_shrink, + NULL); } =20 *(unsigned long *)ptr +=3D unmapped; diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h index a3133a08267c..02b5e9402e32 100644 --- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -559,10 +559,12 @@ void drm_gem_lru_init(struct drm_gem_lru *lru, struct= mutex *lock); void drm_gem_lru_remove(struct drm_gem_object *obj); void drm_gem_lru_move_tail_locked(struct drm_gem_lru *lru, struct drm_gem_= object *obj); void drm_gem_lru_move_tail(struct drm_gem_lru *lru, struct drm_gem_object = *obj); -unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru, - unsigned int nr_to_scan, - unsigned long *remaining, - bool (*shrink)(struct drm_gem_object *obj)); +unsigned long +drm_gem_lru_scan(struct drm_gem_lru *lru, + unsigned int nr_to_scan, + unsigned long *remaining, + bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticke= t), + struct ww_acquire_ctx *ticket); =20 int drm_gem_evict_locked(struct drm_gem_object *obj); =20 --=20 2.50.0