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
 15static 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
 44static 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
 75static 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
140err_unpin:
141	i915_gem_object_unpin_map(ce->state->obj);
142err:
143	intel_context_put(ce);
144	return err;
145}
146
147static 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
194static 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
214	if (intel_engine_pm_is_awake(engine)) {
215		pr_err("%s is awake before starting %s!\n",
216		       engine->name, __func__);
217		return -EINVAL;
218	}
219
220	ce = intel_context_create(engine);
221	if (IS_ERR(ce))
222		return PTR_ERR(ce);
223
224	saved_heartbeat = engine->props.heartbeat_interval_ms;
225	engine->props.heartbeat_interval_ms = 0;
226
227	for (pass = 0; pass <= 2; pass++) {
228		struct i915_request *rq;
229
230		intel_engine_pm_get(engine);
231
232		rq = intel_context_create_request(ce);
233		if (IS_ERR(rq)) {
234			err = PTR_ERR(rq);
235			goto out_engine;
236		}
237
238		err = request_sync(rq);
239		if (err)
240			goto out_engine;
241
242		/* Context will be kept active until after an idle-barrier. */
243		if (i915_active_is_idle(&ce->active)) {
244			pr_err("context is not active; expected idle-barrier (%s pass %d)\n",
245			       engine->name, pass);
246			err = -EINVAL;
247			goto out_engine;
248		}
249
250		if (!intel_engine_pm_is_awake(engine)) {
251			pr_err("%s is asleep before idle-barrier\n",
252			       engine->name);
253			err = -EINVAL;
254			goto out_engine;
255		}
256
257out_engine:
258		intel_engine_pm_put(engine);
259		if (err)
260			goto err;
261	}
262
263	/* Now make sure our idle-barriers are flushed */
264	err = intel_engine_flush_barriers(engine);
265	if (err)
266		goto err;
267
268	/* Wait for the barrier and in the process wait for engine to park */
269	err = context_sync(engine->kernel_context);
270	if (err)
271		goto err;
272
273	if (!i915_active_is_idle(&ce->active)) {
274		pr_err("context is still active!");
275		err = -EINVAL;
276	}
277
278	intel_engine_pm_flush(engine);
279
280	if (intel_engine_pm_is_awake(engine)) {
281		struct drm_printer p = drm_debug_printer(__func__);
282
283		intel_engine_dump(engine, &p,
284				  "%s is still awake:%d after idle-barriers\n",
285				  engine->name,
286				  atomic_read(&engine->wakeref.count));
287		GEM_TRACE_DUMP();
288
289		err = -EINVAL;
290		goto err;
291	}
292
293err:
294	engine->props.heartbeat_interval_ms = saved_heartbeat;
295	intel_context_put(ce);
296	return err;
297}
298
299static int live_active_context(void *arg)
300{
301	struct intel_gt *gt = arg;
302	struct intel_engine_cs *engine;
303	enum intel_engine_id id;
304	int err = 0;
305
306	for_each_engine(engine, gt, id) {
307		err = __live_active_context(engine);
308		if (err)
309			break;
310
311		err = igt_flush_test(gt->i915);
312		if (err)
313			break;
314	}
315
316	return err;
317}
318
319static int __remote_sync(struct intel_context *ce, struct intel_context *remote)
320{
321	struct i915_request *rq;
322	int err;
323
324	err = intel_context_pin(remote);
325	if (err)
326		return err;
327
328	rq = intel_context_create_request(ce);
329	if (IS_ERR(rq)) {
330		err = PTR_ERR(rq);
331		goto unpin;
332	}
333
334	err = intel_context_prepare_remote_request(remote, rq);
335	if (err) {
336		i915_request_add(rq);
337		goto unpin;
338	}
339
340	err = request_sync(rq);
341
342unpin:
343	intel_context_unpin(remote);
344	return err;
345}
346
347static int __live_remote_context(struct intel_engine_cs *engine)
348{
349	struct intel_context *local, *remote;
350	unsigned long saved_heartbeat;
351	int pass;
352	int err;
353
354	/*
355	 * Check that our idle barriers do not interfere with normal
356	 * activity tracking. In particular, check that operating
357	 * on the context image remotely (intel_context_prepare_remote_request),
358	 * which inserts foreign fences into intel_context.active, does not
359	 * clobber the idle-barrier.
360	 */
361
362	if (intel_engine_pm_is_awake(engine)) {
363		pr_err("%s is awake before starting %s!\n",
364		       engine->name, __func__);
365		return -EINVAL;
366	}
367
368	remote = intel_context_create(engine);
369	if (IS_ERR(remote))
370		return PTR_ERR(remote);
371
372	local = intel_context_create(engine);
373	if (IS_ERR(local)) {
374		err = PTR_ERR(local);
375		goto err_remote;
376	}
377
378	saved_heartbeat = engine->props.heartbeat_interval_ms;
379	engine->props.heartbeat_interval_ms = 0;
380	intel_engine_pm_get(engine);
381
382	for (pass = 0; pass <= 2; pass++) {
383		err = __remote_sync(local, remote);
384		if (err)
385			break;
386
387		err = __remote_sync(engine->kernel_context, remote);
388		if (err)
389			break;
390
391		if (i915_active_is_idle(&remote->active)) {
392			pr_err("remote context is not active; expected idle-barrier (%s pass %d)\n",
393			       engine->name, pass);
394			err = -EINVAL;
395			break;
396		}
397	}
398
399	intel_engine_pm_put(engine);
400	engine->props.heartbeat_interval_ms = saved_heartbeat;
401
402	intel_context_put(local);
403err_remote:
404	intel_context_put(remote);
405	return err;
406}
407
408static int live_remote_context(void *arg)
409{
410	struct intel_gt *gt = arg;
411	struct intel_engine_cs *engine;
412	enum intel_engine_id id;
413	int err = 0;
414
415	for_each_engine(engine, gt, id) {
416		err = __live_remote_context(engine);
417		if (err)
418			break;
419
420		err = igt_flush_test(gt->i915);
421		if (err)
422			break;
423	}
424
425	return err;
426}
427
428int intel_context_live_selftests(struct drm_i915_private *i915)
429{
430	static const struct i915_subtest tests[] = {
431		SUBTEST(live_context_size),
432		SUBTEST(live_active_context),
433		SUBTEST(live_remote_context),
434	};
435	struct intel_gt *gt = &i915->gt;
436
437	if (intel_gt_is_wedged(gt))
438		return 0;
439
440	return intel_gt_live_subtests(tests, gt);
441}