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	 * 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
263out_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
299err:
300	engine->props.heartbeat_interval_ms = saved_heartbeat;
301	intel_context_put(ce);
302	return err;
303}
304
305static 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
325static 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
348unpin:
349	intel_context_unpin(remote);
350	return err;
351}
352
353static 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);
413err_remote:
414	intel_context_put(remote);
415	return err;
416}
417
418static 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
438int 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}