[deliverable/linux.git] / drivers / gpu / drm / ttm / ttm_execbuf_util.c

/**************************************************************************
 *
 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#include <drm/ttm/ttm_execbuf_util.h>
#include <drm/ttm/ttm_bo_driver.h>
#include <drm/ttm/ttm_placement.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/module.h>

static void ttm_eu_backoff_reservation_locked(struct list_head *list)
{
	struct ttm_validate_buffer *entry;

	list_for_each_entry(entry, list, head) {
		struct ttm_buffer_object *bo = entry->bo;
		if (!entry->reserved)
			continue;

		entry->reserved = false;
		if (entry->removed) {
			ttm_bo_add_to_lru(bo);
			entry->removed = false;
		}
		__ttm_bo_unreserve(bo);
	}
}

static void ttm_eu_del_from_lru_locked(struct list_head *list)
{
	struct ttm_validate_buffer *entry;

	list_for_each_entry(entry, list, head) {
		struct ttm_buffer_object *bo = entry->bo;
		if (!entry->reserved)
			continue;

		if (!entry->removed) {
			entry->put_count = ttm_bo_del_from_lru(bo);
			entry->removed = true;
		}
	}
}

static void ttm_eu_list_ref_sub(struct list_head *list)
{
	struct ttm_validate_buffer *entry;

	list_for_each_entry(entry, list, head) {
		struct ttm_buffer_object *bo = entry->bo;

		if (entry->put_count) {
			ttm_bo_list_ref_sub(bo, entry->put_count, true);
			entry->put_count = 0;
		}
	}
}

void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
				struct list_head *list)
{
	struct ttm_validate_buffer *entry;
	struct ttm_bo_global *glob;

	if (list_empty(list))
		return;

	entry = list_first_entry(list, struct ttm_validate_buffer, head);
	glob = entry->bo->glob;
	spin_lock(&glob->lru_lock);
	ttm_eu_backoff_reservation_locked(list);
	if (ticket)
		ww_acquire_fini(ticket);
	spin_unlock(&glob->lru_lock);
}
EXPORT_SYMBOL(ttm_eu_backoff_reservation);

/*
 * Reserve buffers for validation.
 *
 * If a buffer in the list is marked for CPU access, we back off and
 * wait for that buffer to become free for GPU access.
 *
 * If a buffer is reserved for another validation, the validator with
 * the highest validation sequence backs off and waits for that buffer
 * to become unreserved. This prevents deadlocks when validating multiple
 * buffers in different orders.
 */

int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
			   struct list_head *list)
{
	struct ttm_bo_global *glob;
	struct ttm_validate_buffer *entry;
	int ret;

	if (list_empty(list))
		return 0;

	list_for_each_entry(entry, list, head) {
		entry->reserved = false;
		entry->put_count = 0;
		entry->removed = false;
	}

	entry = list_first_entry(list, struct ttm_validate_buffer, head);
	glob = entry->bo->glob;

	if (ticket)
		ww_acquire_init(ticket, &reservation_ww_class);
retry:
	list_for_each_entry(entry, list, head) {
		struct ttm_buffer_object *bo = entry->bo;

		/* already slowpath reserved? */
		if (entry->reserved)
			continue;

		ret = __ttm_bo_reserve(bo, true, (ticket == NULL), true,
				       ticket);

		if (ret == -EDEADLK) {
			/* uh oh, we lost out, drop every reservation and try
			 * to only reserve this buffer, then start over if
			 * this succeeds.
			 */
			BUG_ON(ticket == NULL);
			spin_lock(&glob->lru_lock);
			ttm_eu_backoff_reservation_locked(list);
			spin_unlock(&glob->lru_lock);
			ttm_eu_list_ref_sub(list);
			ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock,
							       ticket);
			if (unlikely(ret != 0)) {
				if (ret == -EINTR)
					ret = -ERESTARTSYS;
				goto err_fini;
			}

			entry->reserved = true;
			if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
				ret = -EBUSY;
				goto err;
			}
			goto retry;
		} else if (ret)
			goto err;

		entry->reserved = true;
		if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
			ret = -EBUSY;
			goto err;
		}
	}

	if (ticket)
		ww_acquire_done(ticket);
	spin_lock(&glob->lru_lock);
	ttm_eu_del_from_lru_locked(list);
	spin_unlock(&glob->lru_lock);
	ttm_eu_list_ref_sub(list);
	return 0;

err:
	spin_lock(&glob->lru_lock);
	ttm_eu_backoff_reservation_locked(list);
	spin_unlock(&glob->lru_lock);
	ttm_eu_list_ref_sub(list);
err_fini:
	if (ticket) {
		ww_acquire_done(ticket);
		ww_acquire_fini(ticket);
	}
	return ret;
}
EXPORT_SYMBOL(ttm_eu_reserve_buffers);

void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
				 struct list_head *list, void *sync_obj)
{
	struct ttm_validate_buffer *entry;
	struct ttm_buffer_object *bo;
	struct ttm_bo_global *glob;
	struct ttm_bo_device *bdev;
	struct ttm_bo_driver *driver;

	if (list_empty(list))
		return;

	bo = list_first_entry(list, struct ttm_validate_buffer, head)->bo;
	bdev = bo->bdev;
	driver = bdev->driver;
	glob = bo->glob;

	spin_lock(&glob->lru_lock);
	spin_lock(&bdev->fence_lock);

	list_for_each_entry(entry, list, head) {
		bo = entry->bo;
		entry->old_sync_obj = bo->sync_obj;
		bo->sync_obj = driver->sync_obj_ref(sync_obj);
		ttm_bo_add_to_lru(bo);
		__ttm_bo_unreserve(bo);
		entry->reserved = false;
	}
	spin_unlock(&bdev->fence_lock);
	spin_unlock(&glob->lru_lock);
	if (ticket)
		ww_acquire_fini(ticket);

	list_for_each_entry(entry, list, head) {
		if (entry->old_sync_obj)
			driver->sync_obj_unref(&entry->old_sync_obj);
	}
}
EXPORT_SYMBOL(ttm_eu_fence_buffer_objects);
Commit	Line	Data
c078aa2f TH	1	/**************************************************************************
	2	*
	3	* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
	4	* All Rights Reserved.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the
	8	* "Software"), to deal in the Software without restriction, including
	9	* without limitation the rights to use, copy, modify, merge, publish,
	10	* distribute, sub license, and/or sell copies of the Software, and to
	11	* permit persons to whom the Software is furnished to do so, subject to
	12	* the following conditions:
	13	*
	14	* The above copyright notice and this permission notice (including the
	15	* next paragraph) shall be included in all copies or substantial portions
	16	* of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	21	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	22	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	23	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	24	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	25	*
	26	**************************************************************************/
	27
760285e7 DH	28	#include <drm/ttm/ttm_execbuf_util.h>
	29	#include <drm/ttm/ttm_bo_driver.h>
	30	#include <drm/ttm/ttm_placement.h>
c078aa2f TH	31	#include <linux/wait.h>
	32	#include <linux/sched.h>
	33	#include <linux/module.h>
	34
8d17fb44	35	static void ttm_eu_backoff_reservation_locked(struct list_head *list)
d6ea8886 DA	36	{
	37	struct ttm_validate_buffer *entry;
	38
	39	list_for_each_entry(entry, list, head) {
	40	struct ttm_buffer_object *bo = entry->bo;
	41	if (!entry->reserved)
	42	continue;
	43
ecff665f	44	entry->reserved = false;
d6ea8886	45	if (entry->removed) {
34820324	46	ttm_bo_add_to_lru(bo);
d6ea8886	47	entry->removed = false;
d6ea8886	48	}
c7523083	49	__ttm_bo_unreserve(bo);
d6ea8886 DA	50	}
	51	}
	52
	53	static void ttm_eu_del_from_lru_locked(struct list_head *list)
	54	{
	55	struct ttm_validate_buffer *entry;
	56
	57	list_for_each_entry(entry, list, head) {
	58	struct ttm_buffer_object *bo = entry->bo;
	59	if (!entry->reserved)
	60	continue;
	61
	62	if (!entry->removed) {
	63	entry->put_count = ttm_bo_del_from_lru(bo);
	64	entry->removed = true;
	65	}
	66	}
	67	}
	68
	69	static void ttm_eu_list_ref_sub(struct list_head *list)
	70	{
	71	struct ttm_validate_buffer *entry;
	72
	73	list_for_each_entry(entry, list, head) {
	74	struct ttm_buffer_object *bo = entry->bo;
	75
	76	if (entry->put_count) {
	77	ttm_bo_list_ref_sub(bo, entry->put_count, true);
	78	entry->put_count = 0;
	79	}
	80	}
	81	}
	82
ecff665f ML	83	void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
ecff665f ML	84	struct list_head *list)
c078aa2f TH	85	{
c078aa2f TH	86	struct ttm_validate_buffer *entry;
68c4fa31	87	struct ttm_bo_global *glob;
c078aa2f	88
68c4fa31 TH	89	if (list_empty(list))
68c4fa31 TH	90	return;
c078aa2f	91
68c4fa31 TH	92	entry = list_first_entry(list, struct ttm_validate_buffer, head);
	93	glob = entry->bo->glob;
	94	spin_lock(&glob->lru_lock);
8d17fb44 TH	95	ttm_eu_backoff_reservation_locked(list);
	96	if (ticket)
	97	ww_acquire_fini(ticket);
68c4fa31	98	spin_unlock(&glob->lru_lock);
c078aa2f TH	99	}
	100	EXPORT_SYMBOL(ttm_eu_backoff_reservation);
	101
	102	/*
	103	* Reserve buffers for validation.
	104	*
	105	* If a buffer in the list is marked for CPU access, we back off and
	106	* wait for that buffer to become free for GPU access.
	107	*
	108	* If a buffer is reserved for another validation, the validator with
	109	* the highest validation sequence backs off and waits for that buffer
	110	* to become unreserved. This prevents deadlocks when validating multiple
	111	* buffers in different orders.
	112	*/
	113
ecff665f ML	114	int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
ecff665f ML	115	struct list_head *list)
c078aa2f	116	{
d6ea8886	117	struct ttm_bo_global *glob;
c078aa2f TH	118	struct ttm_validate_buffer *entry;
	119	int ret;
	120
d6ea8886 DA	121	if (list_empty(list))
	122	return 0;
	123
	124	list_for_each_entry(entry, list, head) {
	125	entry->reserved = false;
	126	entry->put_count = 0;
	127	entry->removed = false;
	128	}
	129
	130	entry = list_first_entry(list, struct ttm_validate_buffer, head);
	131	glob = entry->bo->glob;
	132
8d17fb44 TH	133	if (ticket)
8d17fb44 TH	134	ww_acquire_init(ticket, &reservation_ww_class);
f2d476a1	135	retry:
c078aa2f TH	136	list_for_each_entry(entry, list, head) {
	137	struct ttm_buffer_object *bo = entry->bo;
	138
f2d476a1 ML	139	/* already slowpath reserved? */
	140	if (entry->reserved)
	141	continue;
	142
c7523083 TH	143	ret = __ttm_bo_reserve(bo, true, (ticket == NULL), true,
c7523083 TH	144	ticket);
7a186308	145
5e338405 ML	146	if (ret == -EDEADLK) {
	147	/* uh oh, we lost out, drop every reservation and try
	148	* to only reserve this buffer, then start over if
	149	* this succeeds.
	150	*/
8d17fb44	151	BUG_ON(ticket == NULL);
5e338405	152	spin_lock(&glob->lru_lock);
8d17fb44	153	ttm_eu_backoff_reservation_locked(list);
d6ea8886 DA	154	spin_unlock(&glob->lru_lock);
d6ea8886 DA	155	ttm_eu_list_ref_sub(list);
5e338405 ML	156	ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock,
	157	ticket);
	158	if (unlikely(ret != 0)) {
	159	if (ret == -EINTR)
	160	ret = -ERESTARTSYS;
ecff665f	161	goto err_fini;
5e338405	162	}
ecff665f	163
f2d476a1 ML	164	entry->reserved = true;
	165	if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
	166	ret = -EBUSY;
	167	goto err;
	168	}
d6ea8886	169	goto retry;
5e338405	170	} else if (ret)
7a186308	171	goto err;
c078aa2f TH	172
	173	entry->reserved = true;
	174	if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
7a186308 ML	175	ret = -EBUSY;
7a186308 ML	176	goto err;
c078aa2f TH	177	}
c078aa2f TH	178	}
d6ea8886	179
8d17fb44 TH	180	if (ticket)
8d17fb44 TH	181	ww_acquire_done(ticket);
5e338405	182	spin_lock(&glob->lru_lock);
d6ea8886 DA	183	ttm_eu_del_from_lru_locked(list);
	184	spin_unlock(&glob->lru_lock);
	185	ttm_eu_list_ref_sub(list);
c078aa2f	186	return 0;
7a186308 ML	187
7a186308 ML	188	err:
5e338405	189	spin_lock(&glob->lru_lock);
8d17fb44	190	ttm_eu_backoff_reservation_locked(list);
7a186308 ML	191	spin_unlock(&glob->lru_lock);
7a186308 ML	192	ttm_eu_list_ref_sub(list);
ecff665f	193	err_fini:
8d17fb44 TH	194	if (ticket) {
	195	ww_acquire_done(ticket);
	196	ww_acquire_fini(ticket);
	197	}
7a186308	198	return ret;
c078aa2f TH	199	}
	200	EXPORT_SYMBOL(ttm_eu_reserve_buffers);
	201
ecff665f ML	202	void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
ecff665f ML	203	struct list_head list, void sync_obj)
c078aa2f TH	204	{
c078aa2f TH	205	struct ttm_validate_buffer *entry;
95762c2b TH	206	struct ttm_buffer_object *bo;
	207	struct ttm_bo_global *glob;
	208	struct ttm_bo_device *bdev;
	209	struct ttm_bo_driver *driver;
c078aa2f	210
95762c2b TH	211	if (list_empty(list))
	212	return;
	213
	214	bo = list_first_entry(list, struct ttm_validate_buffer, head)->bo;
	215	bdev = bo->bdev;
	216	driver = bdev->driver;
	217	glob = bo->glob;
c078aa2f	218
95762c2b	219	spin_lock(&glob->lru_lock);
4154f051	220	spin_lock(&bdev->fence_lock);
95762c2b TH	221
	222	list_for_each_entry(entry, list, head) {
	223	bo = entry->bo;
	224	entry->old_sync_obj = bo->sync_obj;
c078aa2f	225	bo->sync_obj = driver->sync_obj_ref(sync_obj);
34820324	226	ttm_bo_add_to_lru(bo);
c7523083	227	__ttm_bo_unreserve(bo);
c078aa2f	228	entry->reserved = false;
95762c2b	229	}
95762c2b	230	spin_unlock(&bdev->fence_lock);
4154f051	231	spin_unlock(&glob->lru_lock);
8d17fb44 TH	232	if (ticket)
8d17fb44 TH	233	ww_acquire_fini(ticket);
95762c2b TH	234
	235	list_for_each_entry(entry, list, head) {
	236	if (entry->old_sync_obj)
	237	driver->sync_obj_unref(&entry->old_sync_obj);
c078aa2f TH	238	}
	239	}
	240	EXPORT_SYMBOL(ttm_eu_fence_buffer_objects);