1 /*
2 * Copyright © 2016 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
25 #include "../i915_selftest.h"
26
27 #include "lib_sw_fence.h"
28 #include "mock_context.h"
29 #include "mock_drm.h"
30 #include "mock_gem_device.h"
31
populate_ggtt(struct drm_i915_private * i915)32 static int populate_ggtt(struct drm_i915_private *i915)
33 {
34 struct drm_i915_gem_object *obj;
35 u64 size;
36
37 for (size = 0;
38 size + I915_GTT_PAGE_SIZE <= i915->ggtt.vm.total;
39 size += I915_GTT_PAGE_SIZE) {
40 struct i915_vma *vma;
41
42 obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
43 if (IS_ERR(obj))
44 return PTR_ERR(obj);
45
46 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
47 if (IS_ERR(vma))
48 return PTR_ERR(vma);
49 }
50
51 if (!list_empty(&i915->mm.unbound_list)) {
52 size = 0;
53 list_for_each_entry(obj, &i915->mm.unbound_list, mm.link)
54 size++;
55
56 pr_err("Found %lld objects unbound!\n", size);
57 return -EINVAL;
58 }
59
60 if (list_empty(&i915->ggtt.vm.inactive_list)) {
61 pr_err("No objects on the GGTT inactive list!\n");
62 return -EINVAL;
63 }
64
65 return 0;
66 }
67
unpin_ggtt(struct drm_i915_private * i915)68 static void unpin_ggtt(struct drm_i915_private *i915)
69 {
70 struct i915_vma *vma;
71
72 list_for_each_entry(vma, &i915->ggtt.vm.inactive_list, vm_link)
73 i915_vma_unpin(vma);
74 }
75
cleanup_objects(struct drm_i915_private * i915)76 static void cleanup_objects(struct drm_i915_private *i915)
77 {
78 struct drm_i915_gem_object *obj, *on;
79
80 list_for_each_entry_safe(obj, on, &i915->mm.unbound_list, mm.link)
81 i915_gem_object_put(obj);
82
83 list_for_each_entry_safe(obj, on, &i915->mm.bound_list, mm.link)
84 i915_gem_object_put(obj);
85
86 mutex_unlock(&i915->drm.struct_mutex);
87
88 i915_gem_drain_freed_objects(i915);
89
90 mutex_lock(&i915->drm.struct_mutex);
91 }
92
igt_evict_something(void * arg)93 static int igt_evict_something(void *arg)
94 {
95 struct drm_i915_private *i915 = arg;
96 struct i915_ggtt *ggtt = &i915->ggtt;
97 int err;
98
99 /* Fill the GGTT with pinned objects and try to evict one. */
100
101 err = populate_ggtt(i915);
102 if (err)
103 goto cleanup;
104
105 /* Everything is pinned, nothing should happen */
106 err = i915_gem_evict_something(&ggtt->vm,
107 I915_GTT_PAGE_SIZE, 0, 0,
108 0, U64_MAX,
109 0);
110 if (err != -ENOSPC) {
111 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
112 err);
113 goto cleanup;
114 }
115
116 unpin_ggtt(i915);
117
118 /* Everything is unpinned, we should be able to evict something */
119 err = i915_gem_evict_something(&ggtt->vm,
120 I915_GTT_PAGE_SIZE, 0, 0,
121 0, U64_MAX,
122 0);
123 if (err) {
124 pr_err("i915_gem_evict_something failed on a full GGTT with err=%d\n",
125 err);
126 goto cleanup;
127 }
128
129 cleanup:
130 cleanup_objects(i915);
131 return err;
132 }
133
igt_overcommit(void * arg)134 static int igt_overcommit(void *arg)
135 {
136 struct drm_i915_private *i915 = arg;
137 struct drm_i915_gem_object *obj;
138 struct i915_vma *vma;
139 int err;
140
141 /* Fill the GGTT with pinned objects and then try to pin one more.
142 * We expect it to fail.
143 */
144
145 err = populate_ggtt(i915);
146 if (err)
147 goto cleanup;
148
149 obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
150 if (IS_ERR(obj)) {
151 err = PTR_ERR(obj);
152 goto cleanup;
153 }
154
155 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
156 if (!IS_ERR(vma) || PTR_ERR(vma) != -ENOSPC) {
157 pr_err("Failed to evict+insert, i915_gem_object_ggtt_pin returned err=%d\n", (int)PTR_ERR(vma));
158 err = -EINVAL;
159 goto cleanup;
160 }
161
162 cleanup:
163 cleanup_objects(i915);
164 return err;
165 }
166
igt_evict_for_vma(void * arg)167 static int igt_evict_for_vma(void *arg)
168 {
169 struct drm_i915_private *i915 = arg;
170 struct i915_ggtt *ggtt = &i915->ggtt;
171 struct drm_mm_node target = {
172 .start = 0,
173 .size = 4096,
174 };
175 int err;
176
177 /* Fill the GGTT with pinned objects and try to evict a range. */
178
179 err = populate_ggtt(i915);
180 if (err)
181 goto cleanup;
182
183 /* Everything is pinned, nothing should happen */
184 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
185 if (err != -ENOSPC) {
186 pr_err("i915_gem_evict_for_node on a full GGTT returned err=%d\n",
187 err);
188 goto cleanup;
189 }
190
191 unpin_ggtt(i915);
192
193 /* Everything is unpinned, we should be able to evict the node */
194 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
195 if (err) {
196 pr_err("i915_gem_evict_for_node returned err=%d\n",
197 err);
198 goto cleanup;
199 }
200
201 cleanup:
202 cleanup_objects(i915);
203 return err;
204 }
205
mock_color_adjust(const struct drm_mm_node * node,unsigned long color,u64 * start,u64 * end)206 static void mock_color_adjust(const struct drm_mm_node *node,
207 unsigned long color,
208 u64 *start,
209 u64 *end)
210 {
211 }
212
igt_evict_for_cache_color(void * arg)213 static int igt_evict_for_cache_color(void *arg)
214 {
215 struct drm_i915_private *i915 = arg;
216 struct i915_ggtt *ggtt = &i915->ggtt;
217 const unsigned long flags = PIN_OFFSET_FIXED;
218 struct drm_mm_node target = {
219 .start = I915_GTT_PAGE_SIZE * 2,
220 .size = I915_GTT_PAGE_SIZE,
221 .color = I915_CACHE_LLC,
222 };
223 struct drm_i915_gem_object *obj;
224 struct i915_vma *vma;
225 int err;
226
227 /* Currently the use of color_adjust is limited to cache domains within
228 * the ggtt, and so the presence of mm.color_adjust is assumed to be
229 * i915_gtt_color_adjust throughout our driver, so using a mock color
230 * adjust will work just fine for our purposes.
231 */
232 ggtt->vm.mm.color_adjust = mock_color_adjust;
233
234 obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
235 if (IS_ERR(obj)) {
236 err = PTR_ERR(obj);
237 goto cleanup;
238 }
239 i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
240
241 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
242 I915_GTT_PAGE_SIZE | flags);
243 if (IS_ERR(vma)) {
244 pr_err("[0]i915_gem_object_ggtt_pin failed\n");
245 err = PTR_ERR(vma);
246 goto cleanup;
247 }
248
249 obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
250 if (IS_ERR(obj)) {
251 err = PTR_ERR(obj);
252 goto cleanup;
253 }
254 i915_gem_object_set_cache_level(obj, I915_CACHE_LLC);
255
256 /* Neighbouring; same colour - should fit */
257 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
258 (I915_GTT_PAGE_SIZE * 2) | flags);
259 if (IS_ERR(vma)) {
260 pr_err("[1]i915_gem_object_ggtt_pin failed\n");
261 err = PTR_ERR(vma);
262 goto cleanup;
263 }
264
265 i915_vma_unpin(vma);
266
267 /* Remove just the second vma */
268 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
269 if (err) {
270 pr_err("[0]i915_gem_evict_for_node returned err=%d\n", err);
271 goto cleanup;
272 }
273
274 /* Attempt to remove the first *pinned* vma, by removing the (empty)
275 * neighbour -- this should fail.
276 */
277 target.color = I915_CACHE_L3_LLC;
278
279 err = i915_gem_evict_for_node(&ggtt->vm, &target, 0);
280 if (!err) {
281 pr_err("[1]i915_gem_evict_for_node returned err=%d\n", err);
282 err = -EINVAL;
283 goto cleanup;
284 }
285
286 err = 0;
287
288 cleanup:
289 unpin_ggtt(i915);
290 cleanup_objects(i915);
291 ggtt->vm.mm.color_adjust = NULL;
292 return err;
293 }
294
igt_evict_vm(void * arg)295 static int igt_evict_vm(void *arg)
296 {
297 struct drm_i915_private *i915 = arg;
298 struct i915_ggtt *ggtt = &i915->ggtt;
299 int err;
300
301 /* Fill the GGTT with pinned objects and try to evict everything. */
302
303 err = populate_ggtt(i915);
304 if (err)
305 goto cleanup;
306
307 /* Everything is pinned, nothing should happen */
308 err = i915_gem_evict_vm(&ggtt->vm);
309 if (err) {
310 pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
311 err);
312 goto cleanup;
313 }
314
315 unpin_ggtt(i915);
316
317 err = i915_gem_evict_vm(&ggtt->vm);
318 if (err) {
319 pr_err("i915_gem_evict_vm on a full GGTT returned err=%d]\n",
320 err);
321 goto cleanup;
322 }
323
324 cleanup:
325 cleanup_objects(i915);
326 return err;
327 }
328
igt_evict_contexts(void * arg)329 static int igt_evict_contexts(void *arg)
330 {
331 const u64 PRETEND_GGTT_SIZE = 16ull << 20;
332 struct drm_i915_private *i915 = arg;
333 struct intel_engine_cs *engine;
334 enum intel_engine_id id;
335 struct reserved {
336 struct drm_mm_node node;
337 struct reserved *next;
338 } *reserved = NULL;
339 struct drm_mm_node hole;
340 unsigned long count;
341 int err;
342
343 /*
344 * The purpose of this test is to verify that we will trigger an
345 * eviction in the GGTT when constructing a request that requires
346 * additional space in the GGTT for pinning the context. This space
347 * is not directly tied to the request so reclaiming it requires
348 * extra work.
349 *
350 * As such this test is only meaningful for full-ppgtt environments
351 * where the GTT space of the request is separate from the GGTT
352 * allocation required to build the request.
353 */
354 if (!USES_FULL_PPGTT(i915))
355 return 0;
356
357 mutex_lock(&i915->drm.struct_mutex);
358 intel_runtime_pm_get(i915);
359
360 /* Reserve a block so that we know we have enough to fit a few rq */
361 memset(&hole, 0, sizeof(hole));
362 err = i915_gem_gtt_insert(&i915->ggtt.vm, &hole,
363 PRETEND_GGTT_SIZE, 0, I915_COLOR_UNEVICTABLE,
364 0, i915->ggtt.vm.total,
365 PIN_NOEVICT);
366 if (err)
367 goto out_locked;
368
369 /* Make the GGTT appear small by filling it with unevictable nodes */
370 count = 0;
371 do {
372 struct reserved *r;
373
374 r = kcalloc(1, sizeof(*r), GFP_KERNEL);
375 if (!r) {
376 err = -ENOMEM;
377 goto out_locked;
378 }
379
380 if (i915_gem_gtt_insert(&i915->ggtt.vm, &r->node,
381 1ul << 20, 0, I915_COLOR_UNEVICTABLE,
382 0, i915->ggtt.vm.total,
383 PIN_NOEVICT)) {
384 kfree(r);
385 break;
386 }
387
388 r->next = reserved;
389 reserved = r;
390
391 count++;
392 } while (1);
393 drm_mm_remove_node(&hole);
394 mutex_unlock(&i915->drm.struct_mutex);
395 pr_info("Filled GGTT with %lu 1MiB nodes\n", count);
396
397 /* Overfill the GGTT with context objects and so try to evict one. */
398 for_each_engine(engine, i915, id) {
399 struct i915_sw_fence fence;
400 struct drm_file *file;
401
402 file = mock_file(i915);
403 if (IS_ERR(file))
404 return PTR_ERR(file);
405
406 count = 0;
407 mutex_lock(&i915->drm.struct_mutex);
408 onstack_fence_init(&fence);
409 do {
410 struct i915_request *rq;
411 struct i915_gem_context *ctx;
412
413 ctx = live_context(i915, file);
414 if (!ctx)
415 break;
416
417 /* We will need some GGTT space for the rq's context */
418 igt_evict_ctl.fail_if_busy = true;
419 rq = i915_request_alloc(engine, ctx);
420 igt_evict_ctl.fail_if_busy = false;
421
422 if (IS_ERR(rq)) {
423 /* When full, fail_if_busy will trigger EBUSY */
424 if (PTR_ERR(rq) != -EBUSY) {
425 pr_err("Unexpected error from request alloc (ctx hw id %u, on %s): %d\n",
426 ctx->hw_id, engine->name,
427 (int)PTR_ERR(rq));
428 err = PTR_ERR(rq);
429 }
430 break;
431 }
432
433 /* Keep every request/ctx pinned until we are full */
434 err = i915_sw_fence_await_sw_fence_gfp(&rq->submit,
435 &fence,
436 GFP_KERNEL);
437 if (err < 0)
438 break;
439
440 i915_request_add(rq);
441 count++;
442 err = 0;
443 } while(1);
444 mutex_unlock(&i915->drm.struct_mutex);
445
446 onstack_fence_fini(&fence);
447 pr_info("Submitted %lu contexts/requests on %s\n",
448 count, engine->name);
449
450 mock_file_free(i915, file);
451 if (err)
452 break;
453 }
454
455 mutex_lock(&i915->drm.struct_mutex);
456 out_locked:
457 while (reserved) {
458 struct reserved *next = reserved->next;
459
460 drm_mm_remove_node(&reserved->node);
461 kfree(reserved);
462
463 reserved = next;
464 }
465 if (drm_mm_node_allocated(&hole))
466 drm_mm_remove_node(&hole);
467 intel_runtime_pm_put(i915);
468 mutex_unlock(&i915->drm.struct_mutex);
469
470 return err;
471 }
472
i915_gem_evict_mock_selftests(void)473 int i915_gem_evict_mock_selftests(void)
474 {
475 static const struct i915_subtest tests[] = {
476 SUBTEST(igt_evict_something),
477 SUBTEST(igt_evict_for_vma),
478 SUBTEST(igt_evict_for_cache_color),
479 SUBTEST(igt_evict_vm),
480 SUBTEST(igt_overcommit),
481 };
482 struct drm_i915_private *i915;
483 int err;
484
485 i915 = mock_gem_device();
486 if (!i915)
487 return -ENOMEM;
488
489 mutex_lock(&i915->drm.struct_mutex);
490 err = i915_subtests(tests, i915);
491 mutex_unlock(&i915->drm.struct_mutex);
492
493 drm_dev_put(&i915->drm);
494 return err;
495 }
496
i915_gem_evict_live_selftests(struct drm_i915_private * i915)497 int i915_gem_evict_live_selftests(struct drm_i915_private *i915)
498 {
499 static const struct i915_subtest tests[] = {
500 SUBTEST(igt_evict_contexts),
501 };
502
503 if (i915_terminally_wedged(&i915->gpu_error))
504 return 0;
505
506 return i915_subtests(tests, i915);
507 }
508
