[linux-block.git] / drivers / gpu / drm / i915 / gem / i915_gem_object.c

/*
 * Copyright © 2017 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.
 *
 */

#include <linux/sched/mm.h>

#include "display/intel_frontbuffer.h"
#include "gt/intel_gt.h"
#include "i915_drv.h"
#include "i915_gem_clflush.h"
#include "i915_gem_context.h"
#include "i915_gem_mman.h"
#include "i915_gem_object.h"
#include "i915_globals.h"
#include "i915_trace.h"

static struct i915_global_object {
	struct i915_global base;
	struct kmem_cache *slab_objects;
} global;

struct drm_i915_gem_object *i915_gem_object_alloc(void)
{
	return kmem_cache_zalloc(global.slab_objects, GFP_KERNEL);
}

void i915_gem_object_free(struct drm_i915_gem_object *obj)
{
	return kmem_cache_free(global.slab_objects, obj);
}

void i915_gem_object_init(struct drm_i915_gem_object *obj,
			  const struct drm_i915_gem_object_ops *ops,
			  struct lock_class_key *key)
{
	__mutex_init(&obj->mm.lock, "obj->mm.lock", key);

	spin_lock_init(&obj->vma.lock);
	INIT_LIST_HEAD(&obj->vma.list);

	INIT_LIST_HEAD(&obj->mm.link);

	INIT_LIST_HEAD(&obj->lut_list);

	spin_lock_init(&obj->mmo.lock);
	obj->mmo.offsets = RB_ROOT;

	init_rcu_head(&obj->rcu);

	obj->ops = ops;

	obj->mm.madv = I915_MADV_WILLNEED;
	INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL | __GFP_NOWARN);
	mutex_init(&obj->mm.get_page.lock);
}

/**
 * Mark up the object's coherency levels for a given cache_level
 * @obj: #drm_i915_gem_object
 * @cache_level: cache level
 */
void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
					 unsigned int cache_level)
{
	obj->cache_level = cache_level;

	if (cache_level != I915_CACHE_NONE)
		obj->cache_coherent = (I915_BO_CACHE_COHERENT_FOR_READ |
				       I915_BO_CACHE_COHERENT_FOR_WRITE);
	else if (HAS_LLC(to_i915(obj->base.dev)))
		obj->cache_coherent = I915_BO_CACHE_COHERENT_FOR_READ;
	else
		obj->cache_coherent = 0;

	obj->cache_dirty =
		!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE);
}

void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file)
{
	struct drm_i915_gem_object *obj = to_intel_bo(gem);
	struct drm_i915_file_private *fpriv = file->driver_priv;
	struct i915_mmap_offset *mmo, *mn;
	struct i915_lut_handle *lut, *ln;
	LIST_HEAD(close);

	i915_gem_object_lock(obj);
	list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) {
		struct i915_gem_context *ctx = lut->ctx;

		if (ctx->file_priv != fpriv)
			continue;

		i915_gem_context_get(ctx);
		list_move(&lut->obj_link, &close);
	}
	i915_gem_object_unlock(obj);

	spin_lock(&obj->mmo.lock);
	rbtree_postorder_for_each_entry_safe(mmo, mn, &obj->mmo.offsets, offset)
		drm_vma_node_revoke(&mmo->vma_node, file);
	spin_unlock(&obj->mmo.lock);

	list_for_each_entry_safe(lut, ln, &close, obj_link) {
		struct i915_gem_context *ctx = lut->ctx;
		struct i915_vma *vma;

		/*
		 * We allow the process to have multiple handles to the same
		 * vma, in the same fd namespace, by virtue of flink/open.
		 */

		mutex_lock(&ctx->mutex);
		vma = radix_tree_delete(&ctx->handles_vma, lut->handle);
		if (vma) {
			GEM_BUG_ON(vma->obj != obj);
			GEM_BUG_ON(!atomic_read(&vma->open_count));
			if (atomic_dec_and_test(&vma->open_count) &&
			    !i915_vma_is_ggtt(vma))
				i915_vma_close(vma);
		}
		mutex_unlock(&ctx->mutex);

		i915_gem_context_put(lut->ctx);
		i915_lut_handle_free(lut);
		i915_gem_object_put(obj);
	}
}

static void __i915_gem_free_object_rcu(struct rcu_head *head)
{
	struct drm_i915_gem_object *obj =
		container_of(head, typeof(*obj), rcu);
	struct drm_i915_private *i915 = to_i915(obj->base.dev);

	dma_resv_fini(&obj->base._resv);
	i915_gem_object_free(obj);

	GEM_BUG_ON(!atomic_read(&i915->mm.free_count));
	atomic_dec(&i915->mm.free_count);
}

static void __i915_gem_free_objects(struct drm_i915_private *i915,
				    struct llist_node *freed)
{
	struct drm_i915_gem_object *obj, *on;
	intel_wakeref_t wakeref;

	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
	llist_for_each_entry_safe(obj, on, freed, freed) {
		struct i915_mmap_offset *mmo, *mn;

		trace_i915_gem_object_destroy(obj);

		if (!list_empty(&obj->vma.list)) {
			struct i915_vma *vma;

			/*
			 * Note that the vma keeps an object reference while
			 * it is active, so it *should* not sleep while we
			 * destroy it. Our debug code errs insits it *might*.
			 * For the moment, play along.
			 */
			spin_lock(&obj->vma.lock);
			while ((vma = list_first_entry_or_null(&obj->vma.list,
							       struct i915_vma,
							       obj_link))) {
				GEM_BUG_ON(vma->obj != obj);
				spin_unlock(&obj->vma.lock);

				__i915_vma_put(vma);

				spin_lock(&obj->vma.lock);
			}
			spin_unlock(&obj->vma.lock);
		}

		i915_gem_object_release_mmap(obj);

		rbtree_postorder_for_each_entry_safe(mmo, mn,
						     &obj->mmo.offsets,
						     offset) {
			drm_vma_offset_remove(obj->base.dev->vma_offset_manager,
					      &mmo->vma_node);
			kfree(mmo);
		}
		obj->mmo.offsets = RB_ROOT;

		GEM_BUG_ON(atomic_read(&obj->bind_count));
		GEM_BUG_ON(obj->userfault_count);
		GEM_BUG_ON(!list_empty(&obj->lut_list));

		atomic_set(&obj->mm.pages_pin_count, 0);
		__i915_gem_object_put_pages(obj);
		GEM_BUG_ON(i915_gem_object_has_pages(obj));
		bitmap_free(obj->bit_17);

		if (obj->base.import_attach)
			drm_prime_gem_destroy(&obj->base, NULL);

		drm_gem_free_mmap_offset(&obj->base);

		if (obj->ops->release)
			obj->ops->release(obj);

		/* But keep the pointer alive for RCU-protected lookups */
		call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
		cond_resched();
	}
	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
}

void i915_gem_flush_free_objects(struct drm_i915_private *i915)
{
	struct llist_node *freed = llist_del_all(&i915->mm.free_list);

	if (unlikely(freed))
		__i915_gem_free_objects(i915, freed);
}

static void __i915_gem_free_work(struct work_struct *work)
{
	struct drm_i915_private *i915 =
		container_of(work, struct drm_i915_private, mm.free_work);

	i915_gem_flush_free_objects(i915);
}

void i915_gem_free_object(struct drm_gem_object *gem_obj)
{
	struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
	struct drm_i915_private *i915 = to_i915(obj->base.dev);

	GEM_BUG_ON(i915_gem_object_is_framebuffer(obj));

	/*
	 * Before we free the object, make sure any pure RCU-only
	 * read-side critical sections are complete, e.g.
	 * i915_gem_busy_ioctl(). For the corresponding synchronized
	 * lookup see i915_gem_object_lookup_rcu().
	 */
	atomic_inc(&i915->mm.free_count);

	/*
	 * This serializes freeing with the shrinker. Since the free
	 * is delayed, first by RCU then by the workqueue, we want the
	 * shrinker to be able to free pages of unreferenced objects,
	 * or else we may oom whilst there are plenty of deferred
	 * freed objects.
	 */
	i915_gem_object_make_unshrinkable(obj);

	/*
	 * Since we require blocking on struct_mutex to unbind the freed
	 * object from the GPU before releasing resources back to the
	 * system, we can not do that directly from the RCU callback (which may
	 * be a softirq context), but must instead then defer that work onto a
	 * kthread. We use the RCU callback rather than move the freed object
	 * directly onto the work queue so that we can mix between using the
	 * worker and performing frees directly from subsequent allocations for
	 * crude but effective memory throttling.
	 */
	if (llist_add(&obj->freed, &i915->mm.free_list))
		queue_work(i915->wq, &i915->mm.free_work);
}

static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
{
	return !(obj->cache_level == I915_CACHE_NONE ||
		 obj->cache_level == I915_CACHE_WT);
}

void
i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
				   unsigned int flush_domains)
{
	struct i915_vma *vma;

	assert_object_held(obj);

	if (!(obj->write_domain & flush_domains))
		return;

	switch (obj->write_domain) {
	case I915_GEM_DOMAIN_GTT:
		spin_lock(&obj->vma.lock);
		for_each_ggtt_vma(vma, obj) {
			if (i915_vma_unset_ggtt_write(vma))
				intel_gt_flush_ggtt_writes(vma->vm->gt);
		}
		spin_unlock(&obj->vma.lock);

		i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);
		break;

	case I915_GEM_DOMAIN_WC:
		wmb();
		break;

	case I915_GEM_DOMAIN_CPU:
		i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
		break;

	case I915_GEM_DOMAIN_RENDER:
		if (gpu_write_needs_clflush(obj))
			obj->cache_dirty = true;
		break;
	}

	obj->write_domain = 0;
}

void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
					 enum fb_op_origin origin)
{
	struct intel_frontbuffer *front;

	front = __intel_frontbuffer_get(obj);
	if (front) {
		intel_frontbuffer_flush(front, origin);
		intel_frontbuffer_put(front);
	}
}

void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
					      enum fb_op_origin origin)
{
	struct intel_frontbuffer *front;

	front = __intel_frontbuffer_get(obj);
	if (front) {
		intel_frontbuffer_invalidate(front, origin);
		intel_frontbuffer_put(front);
	}
}

void i915_gem_init__objects(struct drm_i915_private *i915)
{
	INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
}

static void i915_global_objects_shrink(void)
{
	kmem_cache_shrink(global.slab_objects);
}

static void i915_global_objects_exit(void)
{
	kmem_cache_destroy(global.slab_objects);
}

static struct i915_global_object global = { {
	.shrink = i915_global_objects_shrink,
	.exit = i915_global_objects_exit,
} };

int __init i915_global_objects_init(void)
{
	global.slab_objects =
		KMEM_CACHE(drm_i915_gem_object, SLAB_HWCACHE_ALIGN);
	if (!global.slab_objects)
		return -ENOMEM;

	i915_global_register(&global.base);
	return 0;
}

#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/huge_gem_object.c"
#include "selftests/huge_pages.c"
#include "selftests/i915_gem_object.c"
#include "selftests/i915_gem_coherency.c"
#endif
Commit	Line	Data
b8f55be6 CW	1	/*
	2	* Copyright © 2017 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	*/
	24
f86dbacb DV	25	#include <linux/sched/mm.h>
f86dbacb DV	26
df0566a6	27	#include "display/intel_frontbuffer.h"
a1c8a09e	28	#include "gt/intel_gt.h"
b8f55be6	29	#include "i915_drv.h"
b414fcd5	30	#include "i915_gem_clflush.h"
10be98a7	31	#include "i915_gem_context.h"
cc662126	32	#include "i915_gem_mman.h"
10be98a7	33	#include "i915_gem_object.h"
103b76ee	34	#include "i915_globals.h"
a09d9a80	35	#include "i915_trace.h"
b8f55be6	36
13f1bfd3	37	static struct i915_global_object {
103b76ee	38	struct i915_global base;
13f1bfd3 CW	39	struct kmem_cache *slab_objects;
	40	} global;
	41
	42	struct drm_i915_gem_object *i915_gem_object_alloc(void)
	43	{
	44	return kmem_cache_zalloc(global.slab_objects, GFP_KERNEL);
	45	}
	46
	47	void i915_gem_object_free(struct drm_i915_gem_object *obj)
	48	{
	49	return kmem_cache_free(global.slab_objects, obj);
	50	}
	51
8475355f	52	void i915_gem_object_init(struct drm_i915_gem_object *obj,
7867d709 CW	53	const struct drm_i915_gem_object_ops *ops,
7867d709 CW	54	struct lock_class_key *key)
8475355f	55	{
7867d709	56	__mutex_init(&obj->mm.lock, "obj->mm.lock", key);
8475355f CW	57
	58	spin_lock_init(&obj->vma.lock);
	59	INIT_LIST_HEAD(&obj->vma.list);
	60
1aff1903 CW	61	INIT_LIST_HEAD(&obj->mm.link);
1aff1903 CW	62
8475355f	63	INIT_LIST_HEAD(&obj->lut_list);
8475355f	64
cc662126	65	spin_lock_init(&obj->mmo.lock);
07ccd6bd	66	obj->mmo.offsets = RB_ROOT;
cc662126	67
8475355f CW	68	init_rcu_head(&obj->rcu);
	69
	70	obj->ops = ops;
	71
8475355f CW	72	obj->mm.madv = I915_MADV_WILLNEED;
	73	INIT_RADIX_TREE(&obj->mm.get_page.radix, GFP_KERNEL \| __GFP_NOWARN);
	74	mutex_init(&obj->mm.get_page.lock);
8475355f CW	75	}
8475355f CW	76
b8f55be6 CW	77	/**
	78	* Mark up the object's coherency levels for a given cache_level
	79	* @obj: #drm_i915_gem_object
	80	* @cache_level: cache level
	81	*/
	82	void i915_gem_object_set_cache_coherency(struct drm_i915_gem_object *obj,
	83	unsigned int cache_level)
	84	{
	85	obj->cache_level = cache_level;
	86
	87	if (cache_level != I915_CACHE_NONE)
	88	obj->cache_coherent = (I915_BO_CACHE_COHERENT_FOR_READ \|
	89	I915_BO_CACHE_COHERENT_FOR_WRITE);
	90	else if (HAS_LLC(to_i915(obj->base.dev)))
	91	obj->cache_coherent = I915_BO_CACHE_COHERENT_FOR_READ;
	92	else
	93	obj->cache_coherent = 0;
	94
	95	obj->cache_dirty =
	96	!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE);
	97	}
13f1bfd3	98
8475355f CW	99	void i915_gem_close_object(struct drm_gem_object gem, struct drm_file file)
8475355f CW	100	{
8475355f CW	101	struct drm_i915_gem_object *obj = to_intel_bo(gem);
8475355f CW	102	struct drm_i915_file_private *fpriv = file->driver_priv;
07ccd6bd	103	struct i915_mmap_offset mmo, mn;
8475355f	104	struct i915_lut_handle lut, ln;
155ab883	105	LIST_HEAD(close);
8475355f	106
155ab883	107	i915_gem_object_lock(obj);
8475355f CW	108	list_for_each_entry_safe(lut, ln, &obj->lut_list, obj_link) {
8475355f CW	109	struct i915_gem_context *ctx = lut->ctx;
8475355f	110
8475355f CW	111	if (ctx->file_priv != fpriv)
	112	continue;
	113
155ab883 CW	114	i915_gem_context_get(ctx);
	115	list_move(&lut->obj_link, &close);
	116	}
	117	i915_gem_object_unlock(obj);
	118
cc662126	119	spin_lock(&obj->mmo.lock);
07ccd6bd	120	rbtree_postorder_for_each_entry_safe(mmo, mn, &obj->mmo.offsets, offset)
cc662126	121	drm_vma_node_revoke(&mmo->vma_node, file);
cc662126 AJ	122	spin_unlock(&obj->mmo.lock);
cc662126 AJ	123
155ab883 CW	124	list_for_each_entry_safe(lut, ln, &close, obj_link) {
	125	struct i915_gem_context *ctx = lut->ctx;
	126	struct i915_vma *vma;
8475355f	127
155ab883 CW	128	/*
155ab883 CW	129	* We allow the process to have multiple handles to the same
8475355f CW	130	* vma, in the same fd namespace, by virtue of flink/open.
8475355f CW	131	*/
8475355f	132
155ab883 CW	133	mutex_lock(&ctx->mutex);
	134	vma = radix_tree_delete(&ctx->handles_vma, lut->handle);
	135	if (vma) {
	136	GEM_BUG_ON(vma->obj != obj);
	137	GEM_BUG_ON(!atomic_read(&vma->open_count));
	138	if (atomic_dec_and_test(&vma->open_count) &&
	139	!i915_vma_is_ggtt(vma))
	140	i915_vma_close(vma);
	141	}
	142	mutex_unlock(&ctx->mutex);
	143
	144	i915_gem_context_put(lut->ctx);
8475355f	145	i915_lut_handle_free(lut);
c017cf6b	146	i915_gem_object_put(obj);
8475355f	147	}
8475355f CW	148	}
8475355f CW	149
c03467ba CW	150	static void __i915_gem_free_object_rcu(struct rcu_head *head)
	151	{
	152	struct drm_i915_gem_object *obj =
	153	container_of(head, typeof(*obj), rcu);
	154	struct drm_i915_private *i915 = to_i915(obj->base.dev);
	155
5f680625	156	dma_resv_fini(&obj->base._resv);
c03467ba CW	157	i915_gem_object_free(obj);
	158
	159	GEM_BUG_ON(!atomic_read(&i915->mm.free_count));
	160	atomic_dec(&i915->mm.free_count);
	161	}
	162
8475355f CW	163	static void __i915_gem_free_objects(struct drm_i915_private *i915,
	164	struct llist_node *freed)
	165	{
	166	struct drm_i915_gem_object obj, on;
	167	intel_wakeref_t wakeref;
	168
d858d569	169	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
8475355f	170	llist_for_each_entry_safe(obj, on, freed, freed) {
cc662126 AJ	171	struct i915_mmap_offset mmo, mn;
cc662126 AJ	172
8475355f CW	173	trace_i915_gem_object_destroy(obj);
8475355f CW	174
2850748e CW	175	if (!list_empty(&obj->vma.list)) {
	176	struct i915_vma *vma;
	177
	178	/*
	179	* Note that the vma keeps an object reference while
	180	* it is active, so it should not sleep while we
	181	* destroy it. Our debug code errs insits it might.
	182	* For the moment, play along.
	183	*/
	184	spin_lock(&obj->vma.lock);
	185	while ((vma = list_first_entry_or_null(&obj->vma.list,
	186	struct i915_vma,
	187	obj_link))) {
	188	GEM_BUG_ON(vma->obj != obj);
	189	spin_unlock(&obj->vma.lock);
	190
76f9764c	191	__i915_vma_put(vma);
2850748e CW	192
	193	spin_lock(&obj->vma.lock);
	194	}
	195	spin_unlock(&obj->vma.lock);
8475355f	196	}
8475355f	197
cc662126 AJ	198	i915_gem_object_release_mmap(obj);
cc662126 AJ	199
07ccd6bd CW	200	rbtree_postorder_for_each_entry_safe(mmo, mn,
	201	&obj->mmo.offsets,
	202	offset) {
cc662126 AJ	203	drm_vma_offset_remove(obj->base.dev->vma_offset_manager,
	204	&mmo->vma_node);
	205	kfree(mmo);
	206	}
07ccd6bd	207	obj->mmo.offsets = RB_ROOT;
cc662126	208
ecab9be1	209	GEM_BUG_ON(atomic_read(&obj->bind_count));
8475355f	210	GEM_BUG_ON(obj->userfault_count);
8475355f CW	211	GEM_BUG_ON(!list_empty(&obj->lut_list));
8475355f CW	212
0bd6cb6b	213	atomic_set(&obj->mm.pages_pin_count, 0);
f86dbacb	214	__i915_gem_object_put_pages(obj);
8475355f	215	GEM_BUG_ON(i915_gem_object_has_pages(obj));
c03467ba	216	bitmap_free(obj->bit_17);
8475355f CW	217
	218	if (obj->base.import_attach)
	219	drm_prime_gem_destroy(&obj->base, NULL);
	220
0c159ffe CW	221	drm_gem_free_mmap_offset(&obj->base);
	222
	223	if (obj->ops->release)
	224	obj->ops->release(obj);
8475355f	225
c03467ba CW	226	/* But keep the pointer alive for RCU-protected lookups */
c03467ba CW	227	call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
bb699a79	228	cond_resched();
8475355f	229	}
d858d569	230	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
8475355f CW	231	}
	232
	233	void i915_gem_flush_free_objects(struct drm_i915_private *i915)
	234	{
515b8b7e CW	235	struct llist_node *freed = llist_del_all(&i915->mm.free_list);
	236
	237	if (unlikely(freed))
8475355f	238	__i915_gem_free_objects(i915, freed);
8475355f CW	239	}
	240
	241	static void __i915_gem_free_work(struct work_struct *work)
	242	{
	243	struct drm_i915_private *i915 =
	244	container_of(work, struct drm_i915_private, mm.free_work);
8475355f	245
515b8b7e	246	i915_gem_flush_free_objects(i915);
8475355f CW	247	}
8475355f CW	248
c03467ba	249	void i915_gem_free_object(struct drm_gem_object *gem_obj)
8475355f	250	{
c03467ba	251	struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
8475355f CW	252	struct drm_i915_private *i915 = to_i915(obj->base.dev);
8475355f CW	253
8e7cb179 CW	254	GEM_BUG_ON(i915_gem_object_is_framebuffer(obj));
8e7cb179 CW	255
8475355f	256	/*
c03467ba CW	257	* Before we free the object, make sure any pure RCU-only
	258	* read-side critical sections are complete, e.g.
	259	* i915_gem_busy_ioctl(). For the corresponding synchronized
	260	* lookup see i915_gem_object_lookup_rcu().
8475355f	261	*/
c03467ba CW	262	atomic_inc(&i915->mm.free_count);
	263
	264	/*
	265	* This serializes freeing with the shrinker. Since the free
	266	* is delayed, first by RCU then by the workqueue, we want the
	267	* shrinker to be able to free pages of unreferenced objects,
	268	* or else we may oom whilst there are plenty of deferred
	269	* freed objects.
	270	*/
1aff1903	271	i915_gem_object_make_unshrinkable(obj);
8475355f CW	272
	273	/*
	274	* Since we require blocking on struct_mutex to unbind the freed
	275	* object from the GPU before releasing resources back to the
	276	* system, we can not do that directly from the RCU callback (which may
	277	* be a softirq context), but must instead then defer that work onto a
	278	* kthread. We use the RCU callback rather than move the freed object
	279	* directly onto the work queue so that we can mix between using the
	280	* worker and performing frees directly from subsequent allocations for
	281	* crude but effective memory throttling.
	282	*/
	283	if (llist_add(&obj->freed, &i915->mm.free_list))
	284	queue_work(i915->wq, &i915->mm.free_work);
	285	}
	286
b414fcd5 CW	287	static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
	288	{
	289	return !(obj->cache_level == I915_CACHE_NONE \|\|
	290	obj->cache_level == I915_CACHE_WT);
	291	}
	292
	293	void
	294	i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
	295	unsigned int flush_domains)
	296	{
b414fcd5 CW	297	struct i915_vma *vma;
b414fcd5 CW	298
6951e589 CW	299	assert_object_held(obj);
6951e589 CW	300
b414fcd5 CW	301	if (!(obj->write_domain & flush_domains))
	302	return;
	303
	304	switch (obj->write_domain) {
	305	case I915_GEM_DOMAIN_GTT:
53019779	306	spin_lock(&obj->vma.lock);
b414fcd5	307	for_each_ggtt_vma(vma, obj) {
62d1c851 CW	308	if (i915_vma_unset_ggtt_write(vma))
62d1c851 CW	309	intel_gt_flush_ggtt_writes(vma->vm->gt);
b414fcd5	310	}
53019779	311	spin_unlock(&obj->vma.lock);
a1c8a09e	312
da42104f	313	i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);
b414fcd5 CW	314	break;
	315
	316	case I915_GEM_DOMAIN_WC:
	317	wmb();
	318	break;
	319
	320	case I915_GEM_DOMAIN_CPU:
	321	i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
	322	break;
	323
	324	case I915_GEM_DOMAIN_RENDER:
	325	if (gpu_write_needs_clflush(obj))
	326	obj->cache_dirty = true;
	327	break;
	328	}
	329
	330	obj->write_domain = 0;
	331	}
	332
da42104f CW	333	void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
	334	enum fb_op_origin origin)
	335	{
	336	struct intel_frontbuffer *front;
	337
	338	front = __intel_frontbuffer_get(obj);
	339	if (front) {
	340	intel_frontbuffer_flush(front, origin);
	341	intel_frontbuffer_put(front);
	342	}
	343	}
	344
	345	void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
	346	enum fb_op_origin origin)
	347	{
	348	struct intel_frontbuffer *front;
	349
	350	front = __intel_frontbuffer_get(obj);
	351	if (front) {
	352	intel_frontbuffer_invalidate(front, origin);
	353	intel_frontbuffer_put(front);
	354	}
	355	}
	356
8475355f CW	357	void i915_gem_init__objects(struct drm_i915_private *i915)
	358	{
	359	INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);
	360	}
	361
103b76ee CW	362	static void i915_global_objects_shrink(void)
	363	{
	364	kmem_cache_shrink(global.slab_objects);
	365	}
	366
	367	static void i915_global_objects_exit(void)
	368	{
	369	kmem_cache_destroy(global.slab_objects);
	370	}
	371
	372	static struct i915_global_object global = { {
	373	.shrink = i915_global_objects_shrink,
	374	.exit = i915_global_objects_exit,
	375	} };
	376
13f1bfd3 CW	377	int __init i915_global_objects_init(void)
	378	{
	379	global.slab_objects =
	380	KMEM_CACHE(drm_i915_gem_object, SLAB_HWCACHE_ALIGN);
	381	if (!global.slab_objects)
	382	return -ENOMEM;
	383
103b76ee	384	i915_global_register(&global.base);
13f1bfd3 CW	385	return 0;
13f1bfd3 CW	386	}
10be98a7 CW	387
	388	#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
	389	#include "selftests/huge_gem_object.c"
	390	#include "selftests/huge_pages.c"
	391	#include "selftests/i915_gem_object.c"
	392	#include "selftests/i915_gem_coherency.c"
	393	#endif