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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
29 #include <drm/drmP.h>
30 #include <drm/i915_drm.h>
31
32 #include "i915_drv.h"
33 #include "intel_drv.h"
34 #include "i915_trace.h"
35
36 static bool ggtt_is_idle(struct drm_i915_private *dev_priv)
37 {
38 struct i915_ggtt *ggtt = &dev_priv->ggtt;
39 struct intel_engine_cs *engine;
40 enum intel_engine_id id;
41
42 for_each_engine(engine, dev_priv, id) {
43 struct intel_timeline *tl;
44
45 tl = &ggtt->base.timeline.engine[engine->id];
46 if (i915_gem_active_isset(&tl->last_request))
47 return false;
48 }
49
50 return true;
51 }
52
53 static bool
54 mark_free(struct drm_mm_scan *scan,
55 struct i915_vma *vma,
56 unsigned int flags,
57 struct list_head *unwind)
58 {
59 if (i915_vma_is_pinned(vma))
60 return false;
61
62 if (WARN_ON(!list_empty(&vma->exec_list)))
63 return false;
64
65 if (flags & PIN_NONFAULT && !list_empty(&vma->obj->userfault_link))
66 return false;
67
68 list_add(&vma->exec_list, unwind);
69 return drm_mm_scan_add_block(scan, &vma->node);
70 }
71
72 /**
73 * i915_gem_evict_something - Evict vmas to make room for binding a new one
74 * @vm: address space to evict from
75 * @min_size: size of the desired free space
76 * @alignment: alignment constraint of the desired free space
77 * @cache_level: cache_level for the desired space
78 * @start: start (inclusive) of the range from which to evict objects
79 * @end: end (exclusive) of the range from which to evict objects
80 * @flags: additional flags to control the eviction algorithm
81 *
82 * This function will try to evict vmas until a free space satisfying the
83 * requirements is found. Callers must check first whether any such hole exists
84 * already before calling this function.
85 *
86 * This function is used by the object/vma binding code.
87 *
88 * Since this function is only used to free up virtual address space it only
89 * ignores pinned vmas, and not object where the backing storage itself is
90 * pinned. Hence obj->pages_pin_count does not protect against eviction.
91 *
92 * To clarify: This is for freeing up virtual address space, not for freeing
93 * memory in e.g. the shrinker.
94 */
95 int
96 i915_gem_evict_something(struct i915_address_space *vm,
97 u64 min_size, u64 alignment,
98 unsigned cache_level,
99 u64 start, u64 end,
100 unsigned flags)
101 {
102 struct drm_i915_private *dev_priv = vm->i915;
103 struct drm_mm_scan scan;
104 struct list_head eviction_list;
105 struct list_head *phases[] = {
106 &vm->inactive_list,
107 &vm->active_list,
108 NULL,
109 }, **phase;
110 struct i915_vma *vma, *next;
111 struct drm_mm_node *node;
112 enum drm_mm_insert_mode mode;
113 int ret;
114
115 lockdep_assert_held(&vm->i915->drm.struct_mutex);
116 trace_i915_gem_evict(vm, min_size, alignment, flags);
117
118 /*
119 * The goal is to evict objects and amalgamate space in LRU order.
120 * The oldest idle objects reside on the inactive list, which is in
121 * retirement order. The next objects to retire are those in flight,
122 * on the active list, again in retirement order.
123 *
124 * The retirement sequence is thus:
125 * 1. Inactive objects (already retired)
126 * 2. Active objects (will stall on unbinding)
127 *
128 * On each list, the oldest objects lie at the HEAD with the freshest
129 * object on the TAIL.
130 */
131 mode = DRM_MM_INSERT_BEST;
132 if (flags & PIN_HIGH)
133 mode = DRM_MM_INSERT_HIGH;
134 if (flags & PIN_MAPPABLE)
135 mode = DRM_MM_INSERT_LOW;
136 drm_mm_scan_init_with_range(&scan, &vm->mm,
137 min_size, alignment, cache_level,
138 start, end, mode);
139
140 /* Retire before we search the active list. Although we have
141 * reasonable accuracy in our retirement lists, we may have
142 * a stray pin (preventing eviction) that can only be resolved by
143 * retiring.
144 */
145 if (!(flags & PIN_NONBLOCK))
146 i915_gem_retire_requests(dev_priv);
147 else
148 phases[1] = NULL;
149
150 search_again:
151 INIT_LIST_HEAD(&eviction_list);
152 phase = phases;
153 do {
154 list_for_each_entry(vma, *phase, vm_link)
155 if (mark_free(&scan, vma, flags, &eviction_list))
156 goto found;
157 } while (*++phase);
158
159 /* Nothing found, clean up and bail out! */
160 list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
161 ret = drm_mm_scan_remove_block(&scan, &vma->node);
162 BUG_ON(ret);
163
164 INIT_LIST_HEAD(&vma->exec_list);
165 }
166
167 /* Can we unpin some objects such as idle hw contents,
168 * or pending flips? But since only the GGTT has global entries
169 * such as scanouts, rinbuffers and contexts, we can skip the
170 * purge when inspecting per-process local address spaces.
171 */
172 if (!i915_is_ggtt(vm) || flags & PIN_NONBLOCK)
173 return -ENOSPC;
174
175 if (ggtt_is_idle(dev_priv)) {
176 /* If we still have pending pageflip completions, drop
177 * back to userspace to give our workqueues time to
178 * acquire our locks and unpin the old scanouts.
179 */
180 return intel_has_pending_fb_unpin(dev_priv) ? -EAGAIN : -ENOSPC;
181 }
182
183 /* Not everything in the GGTT is tracked via vma (otherwise we
184 * could evict as required with minimal stalling) so we are forced
185 * to idle the GPU and explicitly retire outstanding requests in
186 * the hopes that we can then remove contexts and the like only
187 * bound by their active reference.
188 */
189 ret = i915_gem_switch_to_kernel_context(dev_priv);
190 if (ret)
191 return ret;
192
193 ret = i915_gem_wait_for_idle(dev_priv,
194 I915_WAIT_INTERRUPTIBLE |
195 I915_WAIT_LOCKED);
196 if (ret)
197 return ret;
198
199 i915_gem_retire_requests(dev_priv);
200 goto search_again;
201
202 found:
203 /* drm_mm doesn't allow any other other operations while
204 * scanning, therefore store to-be-evicted objects on a
205 * temporary list and take a reference for all before
206 * calling unbind (which may remove the active reference
207 * of any of our objects, thus corrupting the list).
208 */
209 list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
210 if (drm_mm_scan_remove_block(&scan, &vma->node))
211 __i915_vma_pin(vma);
212 else
213 list_del_init(&vma->exec_list);
214 }
215
216 /* Unbinding will emit any required flushes */
217 ret = 0;
218 while (!list_empty(&eviction_list)) {
219 vma = list_first_entry(&eviction_list,
220 struct i915_vma,
221 exec_list);
222
223 list_del_init(&vma->exec_list);
224 __i915_vma_unpin(vma);
225 if (ret == 0)
226 ret = i915_vma_unbind(vma);
227 }
228
229 while (ret == 0 && (node = drm_mm_scan_color_evict(&scan))) {
230 vma = container_of(node, struct i915_vma, node);
231 ret = i915_vma_unbind(vma);
232 }
233
234 return ret;
235 }
236
237 /**
238 * i915_gem_evict_for_vma - Evict vmas to make room for binding a new one
239 * @vm: address space to evict from
240 * @target: range (and color) to evict for
241 * @flags: additional flags to control the eviction algorithm
242 *
243 * This function will try to evict vmas that overlap the target node.
244 *
245 * To clarify: This is for freeing up virtual address space, not for freeing
246 * memory in e.g. the shrinker.
247 */
248 int i915_gem_evict_for_node(struct i915_address_space *vm,
249 struct drm_mm_node *target,
250 unsigned int flags)
251 {
252 LIST_HEAD(eviction_list);
253 struct drm_mm_node *node;
254 u64 start = target->start;
255 u64 end = start + target->size;
256 struct i915_vma *vma, *next;
257 bool check_color;
258 int ret = 0;
259
260 lockdep_assert_held(&vm->i915->drm.struct_mutex);
261 GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
262 GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
263
264 trace_i915_gem_evict_node(vm, target, flags);
265
266 /* Retire before we search the active list. Although we have
267 * reasonable accuracy in our retirement lists, we may have
268 * a stray pin (preventing eviction) that can only be resolved by
269 * retiring.
270 */
271 if (!(flags & PIN_NONBLOCK))
272 i915_gem_retire_requests(vm->i915);
273
274 check_color = vm->mm.color_adjust;
275 if (check_color) {
276 /* Expand search to cover neighbouring guard pages (or lack!) */
277 if (start)
278 start -= I915_GTT_PAGE_SIZE;
279
280 /* Always look at the page afterwards to avoid the end-of-GTT */
281 end += I915_GTT_PAGE_SIZE;
282 }
283 GEM_BUG_ON(start >= end);
284
285 drm_mm_for_each_node_in_range(node, &vm->mm, start, end) {
286 /* If we find any non-objects (!vma), we cannot evict them */
287 if (node->color == I915_COLOR_UNEVICTABLE) {
288 ret = -ENOSPC;
289 break;
290 }
291
292 GEM_BUG_ON(!node->allocated);
293 vma = container_of(node, typeof(*vma), node);
294
295 /* If we are using coloring to insert guard pages between
296 * different cache domains within the address space, we have
297 * to check whether the objects on either side of our range
298 * abutt and conflict. If they are in conflict, then we evict
299 * those as well to make room for our guard pages.
300 */
301 if (check_color) {
302 if (vma->node.start + vma->node.size == node->start) {
303 if (vma->node.color == node->color)
304 continue;
305 }
306 if (vma->node.start == node->start + node->size) {
307 if (vma->node.color == node->color)
308 continue;
309 }
310 }
311
312 if (flags & PIN_NONBLOCK &&
313 (i915_vma_is_pinned(vma) || i915_vma_is_active(vma))) {
314 ret = -ENOSPC;
315 break;
316 }
317
318 /* Overlap of objects in the same batch? */
319 if (i915_vma_is_pinned(vma) || !list_empty(&vma->exec_list)) {
320 ret = -ENOSPC;
321 if (vma->exec_entry &&
322 vma->exec_entry->flags & EXEC_OBJECT_PINNED)
323 ret = -EINVAL;
324 break;
325 }
326
327 /* Never show fear in the face of dragons!
328 *
329 * We cannot directly remove this node from within this
330 * iterator and as with i915_gem_evict_something() we employ
331 * the vma pin_count in order to prevent the action of
332 * unbinding one vma from freeing (by dropping its active
333 * reference) another in our eviction list.
334 */
335 __i915_vma_pin(vma);
336 list_add(&vma->exec_list, &eviction_list);
337 }
338
339 list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
340 list_del_init(&vma->exec_list);
341 __i915_vma_unpin(vma);
342 if (ret == 0)
343 ret = i915_vma_unbind(vma);
344 }
345
346 return ret;
347 }
348
349 /**
350 * i915_gem_evict_vm - Evict all idle vmas from a vm
351 * @vm: Address space to cleanse
352 * @do_idle: Boolean directing whether to idle first.
353 *
354 * This function evicts all idles vmas from a vm. If all unpinned vmas should be
355 * evicted the @do_idle needs to be set to true.
356 *
357 * This is used by the execbuf code as a last-ditch effort to defragment the
358 * address space.
359 *
360 * To clarify: This is for freeing up virtual address space, not for freeing
361 * memory in e.g. the shrinker.
362 */
363 int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
364 {
365 struct i915_vma *vma, *next;
366 int ret;
367
368 lockdep_assert_held(&vm->i915->drm.struct_mutex);
369 trace_i915_gem_evict_vm(vm);
370
371 if (do_idle) {
372 struct drm_i915_private *dev_priv = vm->i915;
373
374 if (i915_is_ggtt(vm)) {
375 ret = i915_gem_switch_to_kernel_context(dev_priv);
376 if (ret)
377 return ret;
378 }
379
380 ret = i915_gem_wait_for_idle(dev_priv,
381 I915_WAIT_INTERRUPTIBLE |
382 I915_WAIT_LOCKED);
383 if (ret)
384 return ret;
385
386 i915_gem_retire_requests(dev_priv);
387 WARN_ON(!list_empty(&vm->active_list));
388 }
389
390 list_for_each_entry_safe(vma, next, &vm->inactive_list, vm_link)
391 if (!i915_vma_is_pinned(vma))
392 WARN_ON(i915_vma_unbind(vma));
393
394 return 0;
395 }
396
397 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
398 #include "selftests/i915_gem_evict.c"
399 #endif