[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / i915 / i915_gem_evict.c

/*
 * Copyright © 2008-2010 Intel Corporation
 *
 * 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, sublicense,
 * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS 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.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *    Chris Wilson <chris@chris-wilson.co.uuk>
 *
 */

#include <drm/drmP.h>
#include <drm/i915_drm.h>

#include "i915_drv.h"
#include "intel_drv.h"
#include "i915_trace.h"

static bool
mark_free(struct i915_vma *vma, struct list_head *unwind)
{
	if (vma->pin_count)
		return false;

	if (WARN_ON(!list_empty(&vma->exec_list)))
		return false;

	list_add(&vma->exec_list, unwind);
	return drm_mm_scan_add_block(&vma->node);
}

/**
 * i915_gem_evict_something - Evict vmas to make room for binding a new one
 * @dev: drm_device
 * @vm: address space to evict from
 * @min_size: size of the desired free space
 * @alignment: alignment constraint of the desired free space
 * @cache_level: cache_level for the desired space
 * @start: start (inclusive) of the range from which to evict objects
 * @end: end (exclusive) of the range from which to evict objects
 * @flags: additional flags to control the eviction algorithm
 *
 * This function will try to evict vmas until a free space satisfying the
 * requirements is found. Callers must check first whether any such hole exists
 * already before calling this function.
 *
 * This function is used by the object/vma binding code.
 *
 * Since this function is only used to free up virtual address space it only
 * ignores pinned vmas, and not object where the backing storage itself is
 * pinned. Hence obj->pages_pin_count does not protect against eviction.
 *
 * To clarify: This is for freeing up virtual address space, not for freeing
 * memory in e.g. the shrinker.
 */
int
i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm,
			 int min_size, unsigned alignment, unsigned cache_level,
			 unsigned long start, unsigned long end,
			 unsigned flags)
{
	struct list_head eviction_list, unwind_list;
	struct i915_vma *vma;
	int ret = 0;
	int pass = 0;

	trace_i915_gem_evict(dev, min_size, alignment, flags);

	/*
	 * The goal is to evict objects and amalgamate space in LRU order.
	 * The oldest idle objects reside on the inactive list, which is in
	 * retirement order. The next objects to retire are those on the (per
	 * ring) active list that do not have an outstanding flush. Once the
	 * hardware reports completion (the seqno is updated after the
	 * batchbuffer has been finished) the clean buffer objects would
	 * be retired to the inactive list. Any dirty objects would be added
	 * to the tail of the flushing list. So after processing the clean
	 * active objects we need to emit a MI_FLUSH to retire the flushing
	 * list, hence the retirement order of the flushing list is in
	 * advance of the dirty objects on the active lists.
	 *
	 * The retirement sequence is thus:
	 *   1. Inactive objects (already retired)
	 *   2. Clean active objects
	 *   3. Flushing list
	 *   4. Dirty active objects.
	 *
	 * On each list, the oldest objects lie at the HEAD with the freshest
	 * object on the TAIL.
	 */

	INIT_LIST_HEAD(&unwind_list);
	if (start != 0 || end != vm->total) {
		drm_mm_init_scan_with_range(&vm->mm, min_size,
					    alignment, cache_level,
					    start, end);
	} else
		drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);

search_again:
	/* First see if there is a large enough contiguous idle region... */
	list_for_each_entry(vma, &vm->inactive_list, vm_link) {
		if (mark_free(vma, &unwind_list))
			goto found;
	}

	if (flags & PIN_NONBLOCK)
		goto none;

	/* Now merge in the soon-to-be-expired objects... */
	list_for_each_entry(vma, &vm->active_list, vm_link) {
		if (mark_free(vma, &unwind_list))
			goto found;
	}

none:
	/* Nothing found, clean up and bail out! */
	while (!list_empty(&unwind_list)) {
		vma = list_first_entry(&unwind_list,
				       struct i915_vma,
				       exec_list);
		ret = drm_mm_scan_remove_block(&vma->node);
		BUG_ON(ret);

		list_del_init(&vma->exec_list);
	}

	/* Can we unpin some objects such as idle hw contents,
	 * or pending flips?
	 */
	if (flags & PIN_NONBLOCK)
		return -ENOSPC;

	/* Only idle the GPU and repeat the search once */
	if (pass++ == 0) {
		struct drm_i915_private *dev_priv = to_i915(dev);

		if (i915_is_ggtt(vm)) {
			ret = i915_gem_switch_to_kernel_context(dev_priv);
			if (ret)
				return ret;
		}

		ret = i915_gem_wait_for_idle(dev_priv);
		if (ret)
			return ret;

		i915_gem_retire_requests(dev_priv);
		goto search_again;
	}

	/* If we still have pending pageflip completions, drop
	 * back to userspace to give our workqueues time to
	 * acquire our locks and unpin the old scanouts.
	 */
	return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC;

found:
	/* drm_mm doesn't allow any other other operations while
	 * scanning, therefore store to be evicted objects on a
	 * temporary list. */
	INIT_LIST_HEAD(&eviction_list);
	while (!list_empty(&unwind_list)) {
		vma = list_first_entry(&unwind_list,
				       struct i915_vma,
				       exec_list);
		if (drm_mm_scan_remove_block(&vma->node)) {
			list_move(&vma->exec_list, &eviction_list);
			i915_gem_object_get(vma->obj);
			continue;
		}
		list_del_init(&vma->exec_list);
	}

	/* Unbinding will emit any required flushes */
	while (!list_empty(&eviction_list)) {
		struct drm_i915_gem_object *obj;

		vma = list_first_entry(&eviction_list,
				       struct i915_vma,
				       exec_list);

		obj =  vma->obj;
		list_del_init(&vma->exec_list);
		if (ret == 0)
			ret = i915_vma_unbind(vma);

		i915_gem_object_put(obj);
	}

	return ret;
}

int
i915_gem_evict_for_vma(struct i915_vma *target)
{
	struct drm_mm_node *node, *next;

	list_for_each_entry_safe(node, next,
			&target->vm->mm.head_node.node_list,
			node_list) {
		struct i915_vma *vma;
		int ret;

		if (node->start + node->size <= target->node.start)
			continue;
		if (node->start >= target->node.start + target->node.size)
			break;

		vma = container_of(node, typeof(*vma), node);

		if (vma->pin_count) {
			if (!vma->exec_entry || (vma->pin_count > 1))
				/* Object is pinned for some other use */
				return -EBUSY;

			/* We need to evict a buffer in the same batch */
			if (vma->exec_entry->flags & EXEC_OBJECT_PINNED)
				/* Overlapping fixed objects in the same batch */
				return -EINVAL;

			return -ENOSPC;
		}

		ret = i915_vma_unbind(vma);
		if (ret)
			return ret;
	}

	return 0;
}

/**
 * i915_gem_evict_vm - Evict all idle vmas from a vm
 * @vm: Address space to cleanse
 * @do_idle: Boolean directing whether to idle first.
 *
 * This function evicts all idles vmas from a vm. If all unpinned vmas should be
 * evicted the @do_idle needs to be set to true.
 *
 * This is used by the execbuf code as a last-ditch effort to defragment the
 * address space.
 *
 * To clarify: This is for freeing up virtual address space, not for freeing
 * memory in e.g. the shrinker.
 */
int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
{
	struct i915_vma *vma, *next;
	int ret;

	WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex));
	trace_i915_gem_evict_vm(vm);

	if (do_idle) {
		struct drm_i915_private *dev_priv = to_i915(vm->dev);

		if (i915_is_ggtt(vm)) {
			ret = i915_gem_switch_to_kernel_context(dev_priv);
			if (ret)
				return ret;
		}

		ret = i915_gem_wait_for_idle(dev_priv);
		if (ret)
			return ret;

		i915_gem_retire_requests(dev_priv);

		WARN_ON(!list_empty(&vm->active_list));
	}

	list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link)
		if (vma->pin_count == 0)
			WARN_ON(i915_vma_unbind(vma));

	return 0;
}
Commit	Line	Data
b47eb4a2 CW	1	/*
	2	* Copyright © 2008-2010 Intel Corporation
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice (including the next
	12	* paragraph) shall be included in all copies or substantial portions of the
	13	* Software.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	18	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
	21	* IN THE SOFTWARE.
	22	*
	23	* Authors:
	24	* Eric Anholt <eric@anholt.net>
	25	* Chris Wilson <chris@chris-wilson.co.uuk>
	26	*
	27	*/
	28
760285e7	29	#include <drm/drmP.h>
760285e7	30	#include <drm/i915_drm.h>
74e21ac2 CW	31
	32	#include "i915_drv.h"
	33	#include "intel_drv.h"
db53a302	34	#include "i915_trace.h"
b47eb4a2	35
cd377ea9	36	static bool
f6cd1f15	37	mark_free(struct i915_vma vma, struct list_head unwind)
b47eb4a2	38	{
3036537d	39	if (vma->pin_count)
1b50247a CW	40	return false;
1b50247a CW	41
b93dab6e DV	42	if (WARN_ON(!list_empty(&vma->exec_list)))
	43	return false;
	44
82a55ad1	45	list_add(&vma->exec_list, unwind);
2f633156	46	return drm_mm_scan_add_block(&vma->node);
b47eb4a2 CW	47	}
b47eb4a2 CW	48
c2c1d491 DV	49	/**
	50	* i915_gem_evict_something - Evict vmas to make room for binding a new one
	51	* @dev: drm_device
	52	* @vm: address space to evict from
7838a63a	53	* @min_size: size of the desired free space
c2c1d491 DV	54	* @alignment: alignment constraint of the desired free space
c2c1d491 DV	55	* @cache_level: cache_level for the desired space
7838a63a DV	56	* @start: start (inclusive) of the range from which to evict objects
	57	* @end: end (exclusive) of the range from which to evict objects
	58	* @flags: additional flags to control the eviction algorithm
c2c1d491 DV	59	*
	60	* This function will try to evict vmas until a free space satisfying the
	61	* requirements is found. Callers must check first whether any such hole exists
	62	* already before calling this function.
	63	*
	64	* This function is used by the object/vma binding code.
	65	*
eb0b44ad DV	66	* Since this function is only used to free up virtual address space it only
	67	* ignores pinned vmas, and not object where the backing storage itself is
	68	* pinned. Hence obj->pages_pin_count does not protect against eviction.
	69	*
c2c1d491 DV	70	* To clarify: This is for freeing up virtual address space, not for freeing
	71	* memory in e.g. the shrinker.
	72	*/
b47eb4a2	73	int
f6cd1f15 BW	74	i915_gem_evict_something(struct drm_device dev, struct i915_address_space vm,
f6cd1f15 BW	75	int min_size, unsigned alignment, unsigned cache_level,
d23db88c	76	unsigned long start, unsigned long end,
1ec9e26d	77	unsigned flags)
b47eb4a2	78	{
cd377ea9	79	struct list_head eviction_list, unwind_list;
2f633156	80	struct i915_vma *vma;
cd377ea9	81	int ret = 0;
74e21ac2	82	int pass = 0;
b47eb4a2	83
1ec9e26d	84	trace_i915_gem_evict(dev, min_size, alignment, flags);
db53a302	85
cd377ea9 CW	86	/*
	87	* The goal is to evict objects and amalgamate space in LRU order.
	88	* The oldest idle objects reside on the inactive list, which is in
	89	* retirement order. The next objects to retire are those on the (per
	90	* ring) active list that do not have an outstanding flush. Once the
	91	* hardware reports completion (the seqno is updated after the
	92	* batchbuffer has been finished) the clean buffer objects would
	93	* be retired to the inactive list. Any dirty objects would be added
	94	* to the tail of the flushing list. So after processing the clean
	95	* active objects we need to emit a MI_FLUSH to retire the flushing
	96	* list, hence the retirement order of the flushing list is in
	97	* advance of the dirty objects on the active lists.
	98	*
	99	* The retirement sequence is thus:
	100	* 1. Inactive objects (already retired)
	101	* 2. Clean active objects
	102	* 3. Flushing list
	103	* 4. Dirty active objects.
	104	*
	105	* On each list, the oldest objects lie at the HEAD with the freshest
	106	* object on the TAIL.
	107	*/
	108
	109	INIT_LIST_HEAD(&unwind_list);
d23db88c	110	if (start != 0 \|\| end != vm->total) {
5cef07e1	111	drm_mm_init_scan_with_range(&vm->mm, min_size,
d23db88c CW	112	alignment, cache_level,
d23db88c CW	113	start, end);
f6cd1f15	114	} else
5cef07e1	115	drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
cd377ea9	116
ad071acb	117	search_again:
cd377ea9	118	/* First see if there is a large enough contiguous idle region... */
1c7f4bca	119	list_for_each_entry(vma, &vm->inactive_list, vm_link) {
f6cd1f15	120	if (mark_free(vma, &unwind_list))
cd377ea9 CW	121	goto found;
cd377ea9 CW	122	}
b47eb4a2	123
1ec9e26d	124	if (flags & PIN_NONBLOCK)
86a1ee26	125	goto none;
b47eb4a2	126
cd377ea9	127	/* Now merge in the soon-to-be-expired objects... */
1c7f4bca	128	list_for_each_entry(vma, &vm->active_list, vm_link) {
f6cd1f15	129	if (mark_free(vma, &unwind_list))
cd377ea9 CW	130	goto found;
	131	}
	132
86a1ee26	133	none:
cd377ea9	134	/* Nothing found, clean up and bail out! */
092de6f2	135	while (!list_empty(&unwind_list)) {
82a55ad1 BW	136	vma = list_first_entry(&unwind_list,
82a55ad1 BW	137	struct i915_vma,
092de6f2	138	exec_list);
2f633156	139	ret = drm_mm_scan_remove_block(&vma->node);
cd377ea9	140	BUG_ON(ret);
092de6f2	141
82a55ad1	142	list_del_init(&vma->exec_list);
cd377ea9 CW	143	}
cd377ea9 CW	144
ad071acb CW	145	/* Can we unpin some objects such as idle hw contents,
ad071acb CW	146	* or pending flips?
cd377ea9	147	*/
1ec9e26d	148	if (flags & PIN_NONBLOCK)
74e21ac2	149	return -ENOSPC;
ad071acb CW	150
ad071acb CW	151	/* Only idle the GPU and repeat the search once */
74e21ac2	152	if (pass++ == 0) {
6e5a5beb CW	153	struct drm_i915_private *dev_priv = to_i915(dev);
6e5a5beb CW	154
883445d4	155	if (i915_is_ggtt(vm)) {
945657b4	156	ret = i915_gem_switch_to_kernel_context(dev_priv);
883445d4 CW	157	if (ret)
	158	return ret;
	159	}
74e21ac2	160
6e5a5beb CW	161	ret = i915_gem_wait_for_idle(dev_priv);
	162	if (ret)
	163	return ret;
	164
	165	i915_gem_retire_requests(dev_priv);
74e21ac2 CW	166	goto search_again;
	167	}
	168
	169	/* If we still have pending pageflip completions, drop
	170	* back to userspace to give our workqueues time to
	171	* acquire our locks and unpin the old scanouts.
	172	*/
	173	return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC;
cd377ea9 CW	174
cd377ea9 CW	175	found:
e39a0150 CW	176	/* drm_mm doesn't allow any other other operations while
	177	* scanning, therefore store to be evicted objects on a
	178	* temporary list. */
cd377ea9	179	INIT_LIST_HEAD(&eviction_list);
e39a0150	180	while (!list_empty(&unwind_list)) {
82a55ad1 BW	181	vma = list_first_entry(&unwind_list,
82a55ad1 BW	182	struct i915_vma,
432e58ed	183	exec_list);
2f633156	184	if (drm_mm_scan_remove_block(&vma->node)) {
82a55ad1	185	list_move(&vma->exec_list, &eviction_list);
25dc556a	186	i915_gem_object_get(vma->obj);
e39a0150 CW	187	continue;
e39a0150 CW	188	}
82a55ad1	189	list_del_init(&vma->exec_list);
cd377ea9	190	}
b47eb4a2	191
cd377ea9	192	/* Unbinding will emit any required flushes */
e39a0150	193	while (!list_empty(&eviction_list)) {
f8c417cd CW	194	struct drm_i915_gem_object *obj;
f8c417cd CW	195
82a55ad1 BW	196	vma = list_first_entry(&eviction_list,
82a55ad1 BW	197	struct i915_vma,
432e58ed	198	exec_list);
8637b407	199
f8c417cd	200	obj = vma->obj;
8637b407	201	list_del_init(&vma->exec_list);
e39a0150	202	if (ret == 0)
82a55ad1	203	ret = i915_vma_unbind(vma);
092de6f2	204
f8c417cd	205	i915_gem_object_put(obj);
b47eb4a2	206	}
cd377ea9	207
e39a0150	208	return ret;
b47eb4a2 CW	209	}
b47eb4a2 CW	210
506a8e87 CW	211	int
	212	i915_gem_evict_for_vma(struct i915_vma *target)
	213	{
	214	struct drm_mm_node node, next;
	215
	216	list_for_each_entry_safe(node, next,
	217	&target->vm->mm.head_node.node_list,
	218	node_list) {
	219	struct i915_vma *vma;
	220	int ret;
	221
	222	if (node->start + node->size <= target->node.start)
	223	continue;
	224	if (node->start >= target->node.start + target->node.size)
	225	break;
	226
	227	vma = container_of(node, typeof(*vma), node);
	228
	229	if (vma->pin_count) {
	230	if (!vma->exec_entry \|\| (vma->pin_count > 1))
	231	/* Object is pinned for some other use */
	232	return -EBUSY;
	233
	234	/* We need to evict a buffer in the same batch */
	235	if (vma->exec_entry->flags & EXEC_OBJECT_PINNED)
	236	/* Overlapping fixed objects in the same batch */
	237	return -EINVAL;
	238
	239	return -ENOSPC;
	240	}
	241
	242	ret = i915_vma_unbind(vma);
	243	if (ret)
	244	return ret;
	245	}
	246
	247	return 0;
	248	}
	249
68c8c17f	250	/**
c2c1d491	251	* i915_gem_evict_vm - Evict all idle vmas from a vm
c2c1d491	252	* @vm: Address space to cleanse
68c8c17f BW	253	* @do_idle: Boolean directing whether to idle first.
68c8c17f BW	254	*
c2c1d491 DV	255	* This function evicts all idles vmas from a vm. If all unpinned vmas should be
c2c1d491 DV	256	* evicted the @do_idle needs to be set to true.
68c8c17f	257	*
c2c1d491 DV	258	* This is used by the execbuf code as a last-ditch effort to defragment the
	259	* address space.
	260	*
	261	* To clarify: This is for freeing up virtual address space, not for freeing
	262	* memory in e.g. the shrinker.
68c8c17f BW	263	*/
68c8c17f BW	264	int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
7b796122 BW	265	{
	266	struct i915_vma vma, next;
	267	int ret;
	268
b9b5dce5	269	WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex));
bcccff84 BW	270	trace_i915_gem_evict_vm(vm);
bcccff84 BW	271
7b796122	272	if (do_idle) {
6e5a5beb CW	273	struct drm_i915_private *dev_priv = to_i915(vm->dev);
6e5a5beb CW	274
883445d4	275	if (i915_is_ggtt(vm)) {
945657b4	276	ret = i915_gem_switch_to_kernel_context(dev_priv);
883445d4 CW	277	if (ret)
	278	return ret;
	279	}
6e5a5beb CW	280
6e5a5beb CW	281	ret = i915_gem_wait_for_idle(dev_priv);
7b796122 BW	282	if (ret)
	283	return ret;
	284
6e5a5beb	285	i915_gem_retire_requests(dev_priv);
b9b5dce5 BW	286
b9b5dce5 BW	287	WARN_ON(!list_empty(&vm->active_list));
7b796122 BW	288	}
7b796122 BW	289
1c7f4bca	290	list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link)
d7f46fc4	291	if (vma->pin_count == 0)
7b796122 BW	292	WARN_ON(i915_vma_unbind(vma));
	293
	294	return 0;
	295	}