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 i915_coherent_map_type(engine->i915,
92 ce->state->obj, false));
93 if (IS_ERR(vaddr)) {
94 err = PTR_ERR(vaddr);
95 intel_context_unpin(ce);
96 goto err;
97 }
98
99 /*
100 * Note that execlists also applies a redzone which it checks on
101 * context unpin when debugging. We are using the same location
102 * and same poison value so that our checks overlap. Despite the
103 * redundancy, we want to keep this little selftest so that we
104 * get coverage of any and all submission backends, and we can
105 * always extend this test to ensure we trick the HW into a
106 * compromising position wrt to the various sections that need
107 * to be written into the context state.
108 *
109 * TLDR; this overlaps with the execlists redzone.
110 */
111 vaddr += engine->context_size - I915_GTT_PAGE_SIZE;
112 memset(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE);
113
114 rq = intel_context_create_request(ce);
115 intel_context_unpin(ce);
116 if (IS_ERR(rq)) {
117 err = PTR_ERR(rq);
118 goto err_unpin;
119 }
120
121 err = request_sync(rq);
122 if (err)
123 goto err_unpin;
124
125 /* Force the context switch */
126 rq = intel_engine_create_kernel_request(engine);
127 if (IS_ERR(rq)) {
128 err = PTR_ERR(rq);
129 goto err_unpin;
130 }
131 err = request_sync(rq);
132 if (err)
133 goto err_unpin;
134
135 if (memchr_inv(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE)) {
136 pr_err("%s context overwrote trailing red-zone!", engine->name);
137 err = -EINVAL;
138 }
139
140 err_unpin:
141 i915_gem_object_unpin_map(ce->state->obj);
142 err:
143 intel_context_put(ce);
144 return err;
145 }
146
live_context_size(void * arg)147 static int live_context_size(void *arg)
148 {
149 struct intel_gt *gt = arg;
150 struct intel_engine_cs *engine;
151 enum intel_engine_id id;
152 int err = 0;
153
154 /*
155 * Check that our context sizes are correct by seeing if the
156 * HW tries to write past the end of one.
157 */
158
159 for_each_engine(engine, gt, id) {
160 struct file *saved;
161
162 if (!engine->context_size)
163 continue;
164
165 intel_engine_pm_get(engine);
166
167 /*
168 * Hide the old default state -- we lie about the context size
169 * and get confused when the default state is smaller than
170 * expected. For our do nothing request, inheriting the
171 * active state is sufficient, we are only checking that we
172 * don't use more than we planned.
173 */
174 saved = fetch_and_zero(&engine->default_state);
175
176 /* Overlaps with the execlists redzone */
177 engine->context_size += I915_GTT_PAGE_SIZE;
178
179 err = __live_context_size(engine);
180
181 engine->context_size -= I915_GTT_PAGE_SIZE;
182
183 engine->default_state = saved;
184
185 intel_engine_pm_put(engine);
186
187 if (err)
188 break;
189 }
190
191 return err;
192 }
193
__live_active_context(struct intel_engine_cs * engine)194 static int __live_active_context(struct intel_engine_cs *engine)
195 {
196 unsigned long saved_heartbeat;
197 struct intel_context *ce;
198 int pass;
199 int err;
200
201 /*
202 * We keep active contexts alive until after a subsequent context
203 * switch as the final write from the context-save will be after
204 * we retire the final request. We track when we unpin the context,
205 * under the presumption that the final pin is from the last request,
206 * and instead of immediately unpinning the context, we add a task
207 * to unpin the context from the next idle-barrier.
208 *
209 * This test makes sure that the context is kept alive until a
210 * subsequent idle-barrier (emitted when the engine wakeref hits 0
211 * with no more outstanding requests).
212 *
213 * In GuC submission mode we don't use idle barriers and we instead
214 * get a message from the GuC to signal that it is safe to unpin the
215 * context from memory.
216 */
217 if (intel_engine_uses_guc(engine))
218 return 0;
219
220 if (intel_engine_pm_is_awake(engine)) {
221 pr_err("%s is awake before starting %s!\n",
222 engine->name, __func__);
223 return -EINVAL;
224 }
225
226 ce = intel_context_create(engine);
227 if (IS_ERR(ce))
228 return PTR_ERR(ce);
229
230 saved_heartbeat = engine->props.heartbeat_interval_ms;
231 engine->props.heartbeat_interval_ms = 0;
232
233 for (pass = 0; pass <= 2; pass++) {
234 struct i915_request *rq;
235
236 intel_engine_pm_get(engine);
237
238 rq = intel_context_create_request(ce);
239 if (IS_ERR(rq)) {
240 err = PTR_ERR(rq);
241 goto out_engine;
242 }
243
244 err = request_sync(rq);
245 if (err)
246 goto out_engine;
247
248 /* Context will be kept active until after an idle-barrier. */
249 if (i915_active_is_idle(&ce->active)) {
250 pr_err("context is not active; expected idle-barrier (%s pass %d)\n",
251 engine->name, pass);
252 err = -EINVAL;
253 goto out_engine;
254 }
255
256 if (!intel_engine_pm_is_awake(engine)) {
257 pr_err("%s is asleep before idle-barrier\n",
258 engine->name);
259 err = -EINVAL;
260 goto out_engine;
261 }
262
263 out_engine:
264 intel_engine_pm_put(engine);
265 if (err)
266 goto err;
267 }
268
269 /* Now make sure our idle-barriers are flushed */
270 err = intel_engine_flush_barriers(engine);
271 if (err)
272 goto err;
273
274 /* Wait for the barrier and in the process wait for engine to park */
275 err = context_sync(engine->kernel_context);
276 if (err)
277 goto err;
278
279 if (!i915_active_is_idle(&ce->active)) {
280 pr_err("context is still active!");
281 err = -EINVAL;
282 }
283
284 intel_engine_pm_flush(engine);
285
286 if (intel_engine_pm_is_awake(engine)) {
287 struct drm_printer p = drm_debug_printer(__func__);
288
289 intel_engine_dump(engine, &p,
290 "%s is still awake:%d after idle-barriers\n",
291 engine->name,
292 atomic_read(&engine->wakeref.count));
293 GEM_TRACE_DUMP();
294
295 err = -EINVAL;
296 goto err;
297 }
298
299 err:
300 engine->props.heartbeat_interval_ms = saved_heartbeat;
301 intel_context_put(ce);
302 return err;
303 }
304
live_active_context(void * arg)305 static int live_active_context(void *arg)
306 {
307 struct intel_gt *gt = arg;
308 struct intel_engine_cs *engine;
309 enum intel_engine_id id;
310 int err = 0;
311
312 for_each_engine(engine, gt, id) {
313 err = __live_active_context(engine);
314 if (err)
315 break;
316
317 err = igt_flush_test(gt->i915);
318 if (err)
319 break;
320 }
321
322 return err;
323 }
324
__remote_sync(struct intel_context * ce,struct intel_context * remote)325 static int __remote_sync(struct intel_context *ce, struct intel_context *remote)
326 {
327 struct i915_request *rq;
328 int err;
329
330 err = intel_context_pin(remote);
331 if (err)
332 return err;
333
334 rq = intel_context_create_request(ce);
335 if (IS_ERR(rq)) {
336 err = PTR_ERR(rq);
337 goto unpin;
338 }
339
340 err = intel_context_prepare_remote_request(remote, rq);
341 if (err) {
342 i915_request_add(rq);
343 goto unpin;
344 }
345
346 err = request_sync(rq);
347
348 unpin:
349 intel_context_unpin(remote);
350 return err;
351 }
352
__live_remote_context(struct intel_engine_cs * engine)353 static int __live_remote_context(struct intel_engine_cs *engine)
354 {
355 struct intel_context *local, *remote;
356 unsigned long saved_heartbeat;
357 int pass;
358 int err;
359
360 /*
361 * Check that our idle barriers do not interfere with normal
362 * activity tracking. In particular, check that operating
363 * on the context image remotely (intel_context_prepare_remote_request),
364 * which inserts foreign fences into intel_context.active, does not
365 * clobber the idle-barrier.
366 *
367 * In GuC submission mode we don't use idle barriers.
368 */
369 if (intel_engine_uses_guc(engine))
370 return 0;
371
372 if (intel_engine_pm_is_awake(engine)) {
373 pr_err("%s is awake before starting %s!\n",
374 engine->name, __func__);
375 return -EINVAL;
376 }
377
378 remote = intel_context_create(engine);
379 if (IS_ERR(remote))
380 return PTR_ERR(remote);
381
382 local = intel_context_create(engine);
383 if (IS_ERR(local)) {
384 err = PTR_ERR(local);
385 goto err_remote;
386 }
387
388 saved_heartbeat = engine->props.heartbeat_interval_ms;
389 engine->props.heartbeat_interval_ms = 0;
390 intel_engine_pm_get(engine);
391
392 for (pass = 0; pass <= 2; pass++) {
393 err = __remote_sync(local, remote);
394 if (err)
395 break;
396
397 err = __remote_sync(engine->kernel_context, remote);
398 if (err)
399 break;
400
401 if (i915_active_is_idle(&remote->active)) {
402 pr_err("remote context is not active; expected idle-barrier (%s pass %d)\n",
403 engine->name, pass);
404 err = -EINVAL;
405 break;
406 }
407 }
408
409 intel_engine_pm_put(engine);
410 engine->props.heartbeat_interval_ms = saved_heartbeat;
411
412 intel_context_put(local);
413 err_remote:
414 intel_context_put(remote);
415 return err;
416 }
417
live_remote_context(void * arg)418 static int live_remote_context(void *arg)
419 {
420 struct intel_gt *gt = arg;
421 struct intel_engine_cs *engine;
422 enum intel_engine_id id;
423 int err = 0;
424
425 for_each_engine(engine, gt, id) {
426 err = __live_remote_context(engine);
427 if (err)
428 break;
429
430 err = igt_flush_test(gt->i915);
431 if (err)
432 break;
433 }
434
435 return err;
436 }
437
intel_context_live_selftests(struct drm_i915_private * i915)438 int intel_context_live_selftests(struct drm_i915_private *i915)
439 {
440 static const struct i915_subtest tests[] = {
441 SUBTEST(live_context_size),
442 SUBTEST(live_active_context),
443 SUBTEST(live_remote_context),
444 };
445 struct intel_gt *gt = to_gt(i915);
446
447 if (intel_gt_is_wedged(gt))
448 return 0;
449
450 return intel_gt_live_subtests(tests, gt);
451 }
452