[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 "ttm/ttm_execbuf_util.h"
#include "ttm/ttm_bo_driver.h"
#include "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;

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

		}
		entry->reserved = false;
		atomic_set(&bo->reserved, 0);
		wake_up_all(&bo->event_queue);
	}
}

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;
		}
	}
}

static int ttm_eu_wait_unreserved_locked(struct list_head *list,
					 struct ttm_buffer_object *bo)
{
	struct ttm_bo_global *glob = bo->glob;
	int ret;

	ttm_eu_del_from_lru_locked(list);
	spin_unlock(&glob->lru_lock);
	ret = ttm_bo_wait_unreserved(bo, true);
	spin_lock(&glob->lru_lock);
	if (unlikely(ret != 0))
		ttm_eu_backoff_reservation_locked(list);
	return ret;
}


void ttm_eu_backoff_reservation(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);
	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 list_head *list, uint32_t val_seq)
{
	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;

retry:
	spin_lock(&glob->lru_lock);
	list_for_each_entry(entry, list, head) {
		struct ttm_buffer_object *bo = entry->bo;

retry_this_bo:
		ret = ttm_bo_reserve_locked(bo, true, true, true, val_seq);
		switch (ret) {
		case 0:
			break;
		case -EBUSY:
			ret = ttm_eu_wait_unreserved_locked(list, bo);
			if (unlikely(ret != 0)) {
				spin_unlock(&glob->lru_lock);
				ttm_eu_list_ref_sub(list);
				return ret;
			}
			goto retry_this_bo;
		case -EAGAIN:
			ttm_eu_backoff_reservation_locked(list);
			spin_unlock(&glob->lru_lock);
			ttm_eu_list_ref_sub(list);
			ret = ttm_bo_wait_unreserved(bo, true);
			if (unlikely(ret != 0))
				return ret;
			goto retry;
		default:
			ttm_eu_backoff_reservation_locked(list);
			spin_unlock(&glob->lru_lock);
			ttm_eu_list_ref_sub(list);
			return ret;
		}

		entry->reserved = true;
		if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
			ttm_eu_backoff_reservation_locked(list);
			spin_unlock(&glob->lru_lock);
			ttm_eu_list_ref_sub(list);
			ret = ttm_bo_wait_cpu(bo, false);
			if (ret)
				return ret;
			goto retry;
		}
	}

	ttm_eu_del_from_lru_locked(list);
	spin_unlock(&glob->lru_lock);
	ttm_eu_list_ref_sub(list);

	return 0;
}
EXPORT_SYMBOL(ttm_eu_reserve_buffers);

void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj)
{
	struct ttm_validate_buffer *entry;

	list_for_each_entry(entry, list, head) {
		struct ttm_buffer_object *bo = entry->bo;
		struct ttm_bo_device *bdev = bo->bdev;
		struct ttm_bo_driver *driver = bdev->driver;
		void *old_sync_obj;

		spin_lock(&bdev->fence_lock);
		old_sync_obj = bo->sync_obj;
		bo->sync_obj = driver->sync_obj_ref(sync_obj);
		bo->sync_obj_arg = entry->new_sync_obj_arg;
		spin_unlock(&bdev->fence_lock);
		ttm_bo_unreserve(bo);
		entry->reserved = false;
		if (old_sync_obj)
			driver->sync_obj_unref(&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
	28	#include "ttm/ttm_execbuf_util.h"
	29	#include "ttm/ttm_bo_driver.h"
	30	#include "ttm/ttm_placement.h"
	31	#include <linux/wait.h>
	32	#include <linux/sched.h>
	33	#include <linux/module.h>
	34
d6ea8886 DA	35	static void ttm_eu_backoff_reservation_locked(struct list_head *list)
	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
	44	if (entry->removed) {
	45	ttm_bo_add_to_lru(bo);
	46	entry->removed = false;
	47
	48	}
	49	entry->reserved = false;
	50	atomic_set(&bo->reserved, 0);
	51	wake_up_all(&bo->event_queue);
	52	}
	53	}
	54
	55	static void ttm_eu_del_from_lru_locked(struct list_head *list)
	56	{
	57	struct ttm_validate_buffer *entry;
	58
	59	list_for_each_entry(entry, list, head) {
	60	struct ttm_buffer_object *bo = entry->bo;
	61	if (!entry->reserved)
	62	continue;
	63
	64	if (!entry->removed) {
	65	entry->put_count = ttm_bo_del_from_lru(bo);
	66	entry->removed = true;
	67	}
	68	}
	69	}
	70
	71	static void ttm_eu_list_ref_sub(struct list_head *list)
	72	{
	73	struct ttm_validate_buffer *entry;
	74
	75	list_for_each_entry(entry, list, head) {
	76	struct ttm_buffer_object *bo = entry->bo;
	77
	78	if (entry->put_count) {
	79	ttm_bo_list_ref_sub(bo, entry->put_count, true);
	80	entry->put_count = 0;
	81	}
	82	}
	83	}
	84
	85	static int ttm_eu_wait_unreserved_locked(struct list_head *list,
	86	struct ttm_buffer_object *bo)
	87	{
	88	struct ttm_bo_global *glob = bo->glob;
	89	int ret;
	90
	91	ttm_eu_del_from_lru_locked(list);
	92	spin_unlock(&glob->lru_lock);
	93	ret = ttm_bo_wait_unreserved(bo, true);
	94	spin_lock(&glob->lru_lock);
	95	if (unlikely(ret != 0))
	96	ttm_eu_backoff_reservation_locked(list);
	97	return ret;
	98	}
99
100
c078aa2f TH	101	void ttm_eu_backoff_reservation(struct list_head *list)
	102	{
	103	struct ttm_validate_buffer *entry;
68c4fa31	104	struct ttm_bo_global *glob;
c078aa2f	105
68c4fa31 TH	106	if (list_empty(list))
68c4fa31 TH	107	return;
c078aa2f	108
68c4fa31 TH	109	entry = list_first_entry(list, struct ttm_validate_buffer, head);
	110	glob = entry->bo->glob;
	111	spin_lock(&glob->lru_lock);
	112	ttm_eu_backoff_reservation_locked(list);
	113	spin_unlock(&glob->lru_lock);
c078aa2f TH	114	}
	115	EXPORT_SYMBOL(ttm_eu_backoff_reservation);
	116
	117	/*
	118	* Reserve buffers for validation.
	119	*
	120	* If a buffer in the list is marked for CPU access, we back off and
	121	* wait for that buffer to become free for GPU access.
	122	*
	123	* If a buffer is reserved for another validation, the validator with
	124	* the highest validation sequence backs off and waits for that buffer
	125	* to become unreserved. This prevents deadlocks when validating multiple
	126	* buffers in different orders.
	127	*/
	128
	129	int ttm_eu_reserve_buffers(struct list_head *list, uint32_t val_seq)
	130	{
d6ea8886	131	struct ttm_bo_global *glob;
c078aa2f TH	132	struct ttm_validate_buffer *entry;
	133	int ret;
	134
d6ea8886 DA	135	if (list_empty(list))
	136	return 0;
	137
	138	list_for_each_entry(entry, list, head) {
	139	entry->reserved = false;
	140	entry->put_count = 0;
	141	entry->removed = false;
	142	}
	143
	144	entry = list_first_entry(list, struct ttm_validate_buffer, head);
	145	glob = entry->bo->glob;
	146
c078aa2f	147	retry:
d6ea8886	148	spin_lock(&glob->lru_lock);
c078aa2f TH	149	list_for_each_entry(entry, list, head) {
	150	struct ttm_buffer_object *bo = entry->bo;
	151
d6ea8886 DA	152	retry_this_bo:
	153	ret = ttm_bo_reserve_locked(bo, true, true, true, val_seq);
	154	switch (ret) {
	155	case 0:
	156	break;
	157	case -EBUSY:
	158	ret = ttm_eu_wait_unreserved_locked(list, bo);
	159	if (unlikely(ret != 0)) {
	160	spin_unlock(&glob->lru_lock);
	161	ttm_eu_list_ref_sub(list);
	162	return ret;
	163	}
	164	goto retry_this_bo;
	165	case -EAGAIN:
	166	ttm_eu_backoff_reservation_locked(list);
	167	spin_unlock(&glob->lru_lock);
	168	ttm_eu_list_ref_sub(list);
	169	ret = ttm_bo_wait_unreserved(bo, true);
	170	if (unlikely(ret != 0))
c078aa2f	171	return ret;
d6ea8886 DA	172	goto retry;
	173	default:
	174	ttm_eu_backoff_reservation_locked(list);
	175	spin_unlock(&glob->lru_lock);
	176	ttm_eu_list_ref_sub(list);
	177	return ret;
c078aa2f TH	178	}
	179
	180	entry->reserved = true;
	181	if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
d6ea8886 DA	182	ttm_eu_backoff_reservation_locked(list);
	183	spin_unlock(&glob->lru_lock);
	184	ttm_eu_list_ref_sub(list);
c078aa2f TH	185	ret = ttm_bo_wait_cpu(bo, false);
	186	if (ret)
	187	return ret;
	188	goto retry;
	189	}
	190	}
d6ea8886 DA	191
	192	ttm_eu_del_from_lru_locked(list);
	193	spin_unlock(&glob->lru_lock);
	194	ttm_eu_list_ref_sub(list);
	195
c078aa2f TH	196	return 0;
	197	}
	198	EXPORT_SYMBOL(ttm_eu_reserve_buffers);
	199
	200	void ttm_eu_fence_buffer_objects(struct list_head list, void sync_obj)
	201	{
	202	struct ttm_validate_buffer *entry;
	203
	204	list_for_each_entry(entry, list, head) {
	205	struct ttm_buffer_object *bo = entry->bo;
702adba2 TH	206	struct ttm_bo_device *bdev = bo->bdev;
702adba2 TH	207	struct ttm_bo_driver *driver = bdev->driver;
c078aa2f TH	208	void *old_sync_obj;
c078aa2f TH	209
702adba2	210	spin_lock(&bdev->fence_lock);
c078aa2f TH	211	old_sync_obj = bo->sync_obj;
	212	bo->sync_obj = driver->sync_obj_ref(sync_obj);
	213	bo->sync_obj_arg = entry->new_sync_obj_arg;
702adba2	214	spin_unlock(&bdev->fence_lock);
c078aa2f TH	215	ttm_bo_unreserve(bo);
	216	entry->reserved = false;
	217	if (old_sync_obj)
	218	driver->sync_obj_unref(&old_sync_obj);
	219	}
	220	}
	221	EXPORT_SYMBOL(ttm_eu_fence_buffer_objects);