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reservation: add support for fences to enable cross-device synchronisation

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Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Daniel Vetter <daniel@ffwll.ch>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maarten Lankhorst 2014-07-01 12:57:37 +02:00 • committed by Greg Kroah-Hartman
parent 0f0d8406fb
commit 0ba6b8fb91
1 changed files with 19 additions and 1 deletions
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20
include/linux/reservation.h
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@ -6,7 +6,7 @@
* Copyright (C) 2012 Texas Instruments * Copyright (C) 2012 Texas Instruments
* *
* Authors: * Authors:
* Rob Clark <rob.clark@linaro.org> * Rob Clark <robdclark@gmail.com>
* Maarten Lankhorst <maarten.lankhorst@canonical.com> * Maarten Lankhorst <maarten.lankhorst@canonical.com>
* Thomas Hellstrom <thellstrom-at-vmware-dot-com> * Thomas Hellstrom <thellstrom-at-vmware-dot-com>
* *
@ -40,22 +40,40 @@
#define _LINUX_RESERVATION_H #define _LINUX_RESERVATION_H
#include <linux/ww_mutex.h> #include <linux/ww_mutex.h>
#include <linux/fence.h>
#include <linux/slab.h>
extern struct ww_class reservation_ww_class; extern struct ww_class reservation_ww_class;
struct reservation_object { struct reservation_object {
struct ww_mutex lock; struct ww_mutex lock;
struct fence *fence_excl;
struct fence **fence_shared;
u32 fence_shared_count, fence_shared_max;
}; };
static inline void static inline void
reservation_object_init(struct reservation_object *obj) reservation_object_init(struct reservation_object *obj)
{ {
ww_mutex_init(&obj->lock, &reservation_ww_class); ww_mutex_init(&obj->lock, &reservation_ww_class);
obj->fence_shared_count = obj->fence_shared_max = 0;
obj->fence_shared = NULL;
obj->fence_excl = NULL;
} }
static inline void static inline void
reservation_object_fini(struct reservation_object *obj) reservation_object_fini(struct reservation_object *obj)
{ {
int i;
if (obj->fence_excl)
fence_put(obj->fence_excl);
for (i = 0; i < obj->fence_shared_count; ++i)
fence_put(obj->fence_shared[i]);
kfree(obj->fence_shared);
ww_mutex_destroy(&obj->lock); ww_mutex_destroy(&obj->lock);
} }