1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright © 2019 Intel Corporation
4 */
5
6 #include "i915_selftest.h"
7 #include "intel_engine_heartbeat.h"
8 #include "intel_engine_pm.h"
9 #include "intel_gt.h"
10
11 #include "gem/selftests/mock_context.h"
12 #include "selftests/igt_flush_test.h"
13 #include "selftests/mock_drm.h"
14
request_sync(struct i915_request * rq)15 static int request_sync(struct i915_request *rq)
16 {
17 struct intel_timeline *tl = i915_request_timeline(rq);
18 long timeout;
19 int err = 0;
20
21 intel_timeline_get(tl);
22 i915_request_get(rq);
23
24 /* Opencode i915_request_add() so we can keep the timeline locked. */
25 __i915_request_commit(rq);
26 rq->sched.attr.priority = I915_PRIORITY_BARRIER;
27 __i915_request_queue_bh(rq);
28
29 timeout = i915_request_wait(rq, 0, HZ / 10);
30 if (timeout < 0)
31 err = timeout;
32 else
33 i915_request_retire_upto(rq);
34
35 lockdep_unpin_lock(&tl->mutex, rq->cookie);
36 mutex_unlock(&tl->mutex);
37
38 i915_request_put(rq);
39 intel_timeline_put(tl);
40
41 return err;
42 }
43
context_sync(struct intel_context * ce)44 static int context_sync(struct intel_context *ce)
45 {
46 struct intel_timeline *tl = ce->timeline;
47 int err = 0;
48
49 mutex_lock(&tl->mutex);
50 do {
51 struct i915_request *rq;
52 long timeout;
53
54 if (list_empty(&tl->requests))
55 break;
56
57 rq = list_last_entry(&tl->requests, typeof(*rq), link);
58 i915_request_get(rq);
59
60 timeout = i915_request_wait(rq, 0, HZ / 10);
61 if (timeout < 0)
62 err = timeout;
63 else
64 i915_request_retire_upto(rq);
65
66 i915_request_put(rq);
67 } while (!err);
68 mutex_unlock(&tl->mutex);
69
70 /* Wait for all barriers to complete (remote CPU) before we check */
71 i915_active_unlock_wait(&ce->active);
72 return err;
73 }
74
__live_context_size(struct intel_engine_cs * engine)75 static int __live_context_size(struct intel_engine_cs *engine)
76 {
77 struct intel_context *ce;
78 struct i915_request *rq;
79 void *vaddr;
80 int err;
81
82 ce = intel_context_create(engine);
83 if (IS_ERR(ce))
84 return PTR_ERR(ce);
85
86 err = intel_context_pin(ce);
87 if (err)
88 goto err;
89
90 vaddr = i915_gem_object_pin_map_unlocked(ce->state->obj,
91 intel_gt_coherent_map_type(engine->gt,
92 ce->state->obj,
93 false));
94 if (IS_ERR(vaddr)) {
95 err = PTR_ERR(vaddr);
96 intel_context_unpin(ce);
97 goto err;
98 }
99
100 /*
101 * Note that execlists also applies a redzone which it checks on
102 * context unpin when debugging. We are using the same location
103 * and same poison value so that our checks overlap. Despite the
104 * redundancy, we want to keep this little selftest so that we
105 * get coverage of any and all submission backends, and we can
106 * always extend this test to ensure we trick the HW into a
107 * compromising position wrt to the various sections that need
108 * to be written into the context state.
109 *
110 * TLDR; this overlaps with the execlists redzone.
111 */
112 vaddr += engine->context_size - I915_GTT_PAGE_SIZE;
113 memset(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE);
114
115 rq = intel_context_create_request(ce);
116 intel_context_unpin(ce);
117 if (IS_ERR(rq)) {
118 err = PTR_ERR(rq);
119 goto err_unpin;
120 }
121
122 err = request_sync(rq);
123 if (err)
124 goto err_unpin;
125
126 /* Force the context switch */
127 rq = intel_engine_create_kernel_request(engine);
128 if (IS_ERR(rq)) {
129 err = PTR_ERR(rq);
130 goto err_unpin;
131 }
132 err = request_sync(rq);
133 if (err)
134 goto err_unpin;
135
136 if (memchr_inv(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE)) {
137 pr_err("%s context overwrote trailing red-zone!", engine->name);
138 err = -EINVAL;
139 }
140
141 err_unpin:
142 i915_gem_object_unpin_map(ce->state->obj);
143 err:
144 intel_context_put(ce);
145 return err;
146 }
147
live_context_size(void * arg)148 static int live_context_size(void *arg)
149 {
150 struct intel_gt *gt = arg;
151 struct intel_engine_cs *engine;
152 enum intel_engine_id id;
153 int err = 0;
154
155 /*
156 * Check that our context sizes are correct by seeing if the
157 * HW tries to write past the end of one.
158 */
159
160 for_each_engine(engine, gt, id) {
161 struct file *saved;
162
163 if (!engine->context_size)
164 continue;
165
166 intel_engine_pm_get(engine);
167
168 /*
169 * Hide the old default state -- we lie about the context size
170 * and get confused when the default state is smaller than
171 * expected. For our do nothing request, inheriting the
172 * active state is sufficient, we are only checking that we
173 * don't use more than we planned.
174 */
175 saved = fetch_and_zero(&engine->default_state);
176
177 /* Overlaps with the execlists redzone */
178 engine->context_size += I915_GTT_PAGE_SIZE;
179
180 err = __live_context_size(engine);
181
182 engine->context_size -= I915_GTT_PAGE_SIZE;
183
184 engine->default_state = saved;
185
186 intel_engine_pm_put(engine);
187
188 if (err)
189 break;
190 }
191
192 return err;
193 }
194
__live_active_context(struct intel_engine_cs * engine)195 static int __live_active_context(struct intel_engine_cs *engine)
196 {
197 unsigned long saved_heartbeat;
198 struct intel_context *ce;
199 int pass;
200 int err;
201
202 /*
203 * We keep active contexts alive until after a subsequent context
204 * switch as the final write from the context-save will be after
205 * we retire the final request. We track when we unpin the context,
206 * under the presumption that the final pin is from the last request,
207 * and instead of immediately unpinning the context, we add a task
208 * to unpin the context from the next idle-barrier.
209 *
210 * This test makes sure that the context is kept alive until a
211 * subsequent idle-barrier (emitted when the engine wakeref hits 0
212 * with no more outstanding requests).
213 *
214 * In GuC submission mode we don't use idle barriers and we instead
215 * get a message from the GuC to signal that it is safe to unpin the
216 * context from memory.
217 */
218 if (intel_engine_uses_guc(engine))
219 return 0;
220
221 if (intel_engine_pm_is_awake(engine)) {
222 pr_err("%s is awake before starting %s!\n",
223 engine->name, __func__);
224 return -EINVAL;
225 }
226
227 ce = intel_context_create(engine);
228 if (IS_ERR(ce))
229 return PTR_ERR(ce);
230
231 saved_heartbeat = engine->props.heartbeat_interval_ms;
232 engine->props.heartbeat_interval_ms = 0;
233
234 for (pass = 0; pass <= 2; pass++) {
235 struct i915_request *rq;
236
237 intel_engine_pm_get(engine);
238
239 rq = intel_context_create_request(ce);
240 if (IS_ERR(rq)) {
241 err = PTR_ERR(rq);
242 goto out_engine;
243 }
244
245 err = request_sync(rq);
246 if (err)
247 goto out_engine;
248
249 /* Context will be kept active until after an idle-barrier. */
250 if (i915_active_is_idle(&ce->active)) {
251 pr_err("context is not active; expected idle-barrier (%s pass %d)\n",
252 engine->name, pass);
253 err = -EINVAL;
254 goto out_engine;
255 }
256
257 if (!intel_engine_pm_is_awake(engine)) {
258 pr_err("%s is asleep before idle-barrier\n",
259 engine->name);
260 err = -EINVAL;
261 goto out_engine;
262 }
263
264 out_engine:
265 intel_engine_pm_put(engine);
266 if (err)
267 goto err;
268 }
269
270 /* Now make sure our idle-barriers are flushed */
271 err = intel_engine_flush_barriers(engine);
272 if (err)
273 goto err;
274
275 /* Wait for the barrier and in the process wait for engine to park */
276 err = context_sync(engine->kernel_context);
277 if (err)
278 goto err;
279
280 if (!i915_active_is_idle(&ce->active)) {
281 pr_err("context is still active!");
282 err = -EINVAL;
283 }
284
285 intel_engine_pm_flush(engine);
286
287 if (intel_engine_pm_is_awake(engine)) {
288 struct drm_printer p = drm_debug_printer(__func__);
289
290 intel_engine_dump(engine, &p,
291 "%s is still awake:%d after idle-barriers\n",
292 engine->name,
293 atomic_read(&engine->wakeref.count));
294 GEM_TRACE_DUMP();
295
296 err = -EINVAL;
297 goto err;
298 }
299
300 err:
301 engine->props.heartbeat_interval_ms = saved_heartbeat;
302 intel_context_put(ce);
303 return err;
304 }
305
live_active_context(void * arg)306 static int live_active_context(void *arg)
307 {
308 struct intel_gt *gt = arg;
309 struct intel_engine_cs *engine;
310 enum intel_engine_id id;
311 int err = 0;
312
313 for_each_engine(engine, gt, id) {
314 err = __live_active_context(engine);
315 if (err)
316 break;
317
318 err = igt_flush_test(gt->i915);
319 if (err)
320 break;
321 }
322
323 return err;
324 }
325
__remote_sync(struct intel_context * ce,struct intel_context * remote)326 static int __remote_sync(struct intel_context *ce, struct intel_context *remote)
327 {
328 struct i915_request *rq;
329 int err;
330
331 err = intel_context_pin(remote);
332 if (err)
333 return err;
334
335 rq = intel_context_create_request(ce);
336 if (IS_ERR(rq)) {
337 err = PTR_ERR(rq);
338 goto unpin;
339 }
340
341 err = intel_context_prepare_remote_request(remote, rq);
342 if (err) {
343 i915_request_add(rq);
344 goto unpin;
345 }
346
347 err = request_sync(rq);
348
349 unpin:
350 intel_context_unpin(remote);
351 return err;
352 }
353
__live_remote_context(struct intel_engine_cs * engine)354 static int __live_remote_context(struct intel_engine_cs *engine)
355 {
356 struct intel_context *local, *remote;
357 unsigned long saved_heartbeat;
358 int pass;
359 int err;
360
361 /*
362 * Check that our idle barriers do not interfere with normal
363 * activity tracking. In particular, check that operating
364 * on the context image remotely (intel_context_prepare_remote_request),
365 * which inserts foreign fences into intel_context.active, does not
366 * clobber the idle-barrier.
367 *
368 * In GuC submission mode we don't use idle barriers.
369 */
370 if (intel_engine_uses_guc(engine))
371 return 0;
372
373 if (intel_engine_pm_is_awake(engine)) {
374 pr_err("%s is awake before starting %s!\n",
375 engine->name, __func__);
376 return -EINVAL;
377 }
378
379 remote = intel_context_create(engine);
380 if (IS_ERR(remote))
381 return PTR_ERR(remote);
382
383 local = intel_context_create(engine);
384 if (IS_ERR(local)) {
385 err = PTR_ERR(local);
386 goto err_remote;
387 }
388
389 saved_heartbeat = engine->props.heartbeat_interval_ms;
390 engine->props.heartbeat_interval_ms = 0;
391 intel_engine_pm_get(engine);
392
393 for (pass = 0; pass <= 2; pass++) {
394 err = __remote_sync(local, remote);
395 if (err)
396 break;
397
398 err = __remote_sync(engine->kernel_context, remote);
399 if (err)
400 break;
401
402 if (i915_active_is_idle(&remote->active)) {
403 pr_err("remote context is not active; expected idle-barrier (%s pass %d)\n",
404 engine->name, pass);
405 err = -EINVAL;
406 break;
407 }
408 }
409
410 intel_engine_pm_put(engine);
411 engine->props.heartbeat_interval_ms = saved_heartbeat;
412
413 intel_context_put(local);
414 err_remote:
415 intel_context_put(remote);
416 return err;
417 }
418
live_remote_context(void * arg)419 static int live_remote_context(void *arg)
420 {
421 struct intel_gt *gt = arg;
422 struct intel_engine_cs *engine;
423 enum intel_engine_id id;
424 int err = 0;
425
426 for_each_engine(engine, gt, id) {
427 err = __live_remote_context(engine);
428 if (err)
429 break;
430
431 err = igt_flush_test(gt->i915);
432 if (err)
433 break;
434 }
435
436 return err;
437 }
438
intel_context_live_selftests(struct drm_i915_private * i915)439 int intel_context_live_selftests(struct drm_i915_private *i915)
440 {
441 static const struct i915_subtest tests[] = {
442 SUBTEST(live_context_size),
443 SUBTEST(live_active_context),
444 SUBTEST(live_remote_context),
445 };
446 struct intel_gt *gt = to_gt(i915);
447
448 if (intel_gt_is_wedged(gt))
449 return 0;
450
451 return intel_gt_live_subtests(tests, gt);
452 }
453