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dma-buf: Provide wrappers for reservation's lock 

Joonas complained that writing ww_mutex_lock(&resv->lock, ctx) was too
intrusive compared to reservation_object_lock(resv, ctx);

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161115154642.31850-1-chris@chris-wilson.co.uk
zero-colors
Chris Wilson 2016-11-15 15:46:42 +00:00 committed by Daniel Vetter
parent 7da0e124af
commit 122020af85
1 changed files with 34 additions and 0 deletions
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34
include/linux/reservation.h
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@ -144,6 +144,40 @@ reservation_object_get_list(struct reservation_object *obj)
reservation_object_held(obj));
}
/**
* reservation_object_lock - lock the reservation object
* @obj: the reservation object
* @ctx: the locking context
*
* Locks the reservation object for exclusive access and modification. Note,
* that the lock is only against other writers, readers will run concurrently
* with a writer under RCU. The seqlock is used to notify readers if they
* overlap with a writer.
*
* As the reservation object may be locked by multiple parties in an
* undefined order, a #ww_acquire_ctx is passed to unwind if a cycle
* is detected. See ww_mutex_lock() and ww_acquire_init(). A reservation
* object may be locked by itself by passing NULL as @ctx.
*/
static inline int
reservation_object_lock(struct reservation_object *obj,
struct ww_acquire_ctx *ctx)
{
return ww_mutex_lock(&obj->lock, ctx);
}
/**
* reservation_object_unlock - unlock the reservation object
* @obj: the reservation object
*
* Unlocks the reservation object following exclusive access.
*/
static inline void
reservation_object_unlock(struct reservation_object *obj)
{
ww_mutex_unlock(&obj->lock);
}
/**
* reservation_object_get_excl - get the reservation object's
* exclusive fence, with update-side lock held