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5060 serge 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 
25
 *    Chris Wilson 
26
 *
27
 */
28
 
29
#include 
30
#include 
31
 
32
#include "i915_drv.h"
33
#include "intel_drv.h"
34
#include "i915_trace.h"
35
 
36
static bool
37
mark_free(struct i915_vma *vma, struct list_head *unwind)
38
{
39
	if (vma->pin_count)
40
		return false;
41
 
42
	if (WARN_ON(!list_empty(&vma->exec_list)))
43
		return false;
44
 
45
	list_add(&vma->exec_list, unwind);
46
	return drm_mm_scan_add_block(&vma->node);
47
}
48
 
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
6084 serge 53
 * @min_size: size of the desired free space
5060 serge 54
 * @alignment: alignment constraint of the desired free space
55
 * @cache_level: cache_level for the desired space
6084 serge 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
5060 serge 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
 *
6084 serge 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
 *
5060 serge 70
 * To clarify: This is for freeing up virtual address space, not for freeing
71
 * memory in e.g. the shrinker.
72
 */
73
int
74
i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm,
75
			 int min_size, unsigned alignment, unsigned cache_level,
76
			 unsigned long start, unsigned long end,
77
			 unsigned flags)
78
{
79
	struct list_head eviction_list, unwind_list;
80
	struct i915_vma *vma;
81
	int ret = 0;
82
	int pass = 0;
83
 
84
	trace_i915_gem_evict(dev, min_size, alignment, flags);
85
 
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);
110
	if (start != 0 || end != vm->total) {
111
		drm_mm_init_scan_with_range(&vm->mm, min_size,
112
					    alignment, cache_level,
113
					    start, end);
114
	} else
115
		drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
116
 
117
search_again:
118
	/* First see if there is a large enough contiguous idle region... */
7144 serge 119
	list_for_each_entry(vma, &vm->inactive_list, vm_link) {
5060 serge 120
		if (mark_free(vma, &unwind_list))
121
			goto found;
122
	}
123
 
124
	if (flags & PIN_NONBLOCK)
125
		goto none;
126
 
127
	/* Now merge in the soon-to-be-expired objects... */
7144 serge 128
	list_for_each_entry(vma, &vm->active_list, vm_link) {
5060 serge 129
		if (mark_free(vma, &unwind_list))
130
			goto found;
131
	}
132
 
133
none:
134
	/* Nothing found, clean up and bail out! */
135
	while (!list_empty(&unwind_list)) {
136
		vma = list_first_entry(&unwind_list,
137
				       struct i915_vma,
138
				       exec_list);
139
		ret = drm_mm_scan_remove_block(&vma->node);
140
		BUG_ON(ret);
141
 
142
		list_del_init(&vma->exec_list);
143
	}
144
 
145
	/* Can we unpin some objects such as idle hw contents,
146
	 * or pending flips?
147
	 */
148
	if (flags & PIN_NONBLOCK)
149
		return -ENOSPC;
150
 
151
	/* Only idle the GPU and repeat the search once */
152
	if (pass++ == 0) {
153
		ret = i915_gpu_idle(dev);
154
		if (ret)
155
			return ret;
156
 
157
		i915_gem_retire_requests(dev);
158
		goto search_again;
159
	}
160
 
161
	/* If we still have pending pageflip completions, drop
162
	 * back to userspace to give our workqueues time to
163
	 * acquire our locks and unpin the old scanouts.
164
	 */
165
	return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC;
166
 
167
found:
168
	/* drm_mm doesn't allow any other other operations while
169
	 * scanning, therefore store to be evicted objects on a
170
	 * temporary list. */
171
	INIT_LIST_HEAD(&eviction_list);
172
	while (!list_empty(&unwind_list)) {
173
		vma = list_first_entry(&unwind_list,
174
				       struct i915_vma,
175
				       exec_list);
176
		if (drm_mm_scan_remove_block(&vma->node)) {
177
			list_move(&vma->exec_list, &eviction_list);
178
			drm_gem_object_reference(&vma->obj->base);
179
			continue;
180
		}
181
		list_del_init(&vma->exec_list);
182
	}
183
 
184
	/* Unbinding will emit any required flushes */
185
	while (!list_empty(&eviction_list)) {
186
		struct drm_gem_object *obj;
187
		vma = list_first_entry(&eviction_list,
188
				       struct i915_vma,
189
				       exec_list);
190
 
191
		obj =  &vma->obj->base;
192
		list_del_init(&vma->exec_list);
193
		if (ret == 0)
194
			ret = i915_vma_unbind(vma);
195
 
196
		drm_gem_object_unreference(obj);
197
	}
198
 
199
	return ret;
200
}
201
 
6937 serge 202
int
203
i915_gem_evict_for_vma(struct i915_vma *target)
204
{
205
	struct drm_mm_node *node, *next;
206
 
207
	list_for_each_entry_safe(node, next,
208
			&target->vm->mm.head_node.node_list,
209
			node_list) {
210
		struct i915_vma *vma;
211
		int ret;
212
 
213
		if (node->start + node->size <= target->node.start)
214
			continue;
215
		if (node->start >= target->node.start + target->node.size)
216
			break;
217
 
218
		vma = container_of(node, typeof(*vma), node);
219
 
220
		if (vma->pin_count) {
221
			if (!vma->exec_entry || (vma->pin_count > 1))
222
				/* Object is pinned for some other use */
223
				return -EBUSY;
224
 
225
			/* We need to evict a buffer in the same batch */
226
			if (vma->exec_entry->flags & EXEC_OBJECT_PINNED)
227
				/* Overlapping fixed objects in the same batch */
228
				return -EINVAL;
229
 
230
			return -ENOSPC;
231
		}
232
 
233
		ret = i915_vma_unbind(vma);
234
		if (ret)
235
			return ret;
236
	}
237
 
238
	return 0;
239
}
240
 
5060 serge 241
/**
242
 * i915_gem_evict_vm - Evict all idle vmas from a vm
243
 * @vm: Address space to cleanse
244
 * @do_idle: Boolean directing whether to idle first.
245
 *
246
 * This function evicts all idles vmas from a vm. If all unpinned vmas should be
247
 * evicted the @do_idle needs to be set to true.
248
 *
249
 * This is used by the execbuf code as a last-ditch effort to defragment the
250
 * address space.
251
 *
252
 * To clarify: This is for freeing up virtual address space, not for freeing
253
 * memory in e.g. the shrinker.
254
 */
255
int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
256
{
257
	struct i915_vma *vma, *next;
258
	int ret;
259
 
6084 serge 260
	WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex));
5060 serge 261
	trace_i915_gem_evict_vm(vm);
262
 
263
	if (do_idle) {
264
		ret = i915_gpu_idle(vm->dev);
265
		if (ret)
266
			return ret;
267
 
268
		i915_gem_retire_requests(vm->dev);
6084 serge 269
 
270
		WARN_ON(!list_empty(&vm->active_list));
5060 serge 271
	}
272
 
7144 serge 273
	list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link)
5060 serge 274
		if (vma->pin_count == 0)
275
			WARN_ON(i915_vma_unbind(vma));
276
 
277
	return 0;
278
}