2 * SPDX-License-Identifier: GPL-2.0
4 * Copyright © 2019 Intel Corporation
7 #include "i915_selftest.h"
8 #include "intel_engine_heartbeat.h"
9 #include "intel_engine_pm.h"
12 #include "gem/selftests/mock_context.h"
13 #include "selftests/igt_flush_test.h"
14 #include "selftests/mock_drm.h"
16 static int request_sync(struct i915_request *rq)
18 struct intel_timeline *tl = i915_request_timeline(rq);
22 intel_timeline_get(tl);
25 /* Opencode i915_request_add() so we can keep the timeline locked. */
26 __i915_request_commit(rq);
27 __i915_request_queue(rq, NULL);
29 timeout = i915_request_wait(rq, 0, HZ / 10);
33 i915_request_retire_upto(rq);
35 lockdep_unpin_lock(&tl->mutex, rq->cookie);
36 mutex_unlock(&tl->mutex);
39 intel_timeline_put(tl);
44 static int context_sync(struct intel_context *ce)
46 struct intel_timeline *tl = ce->timeline;
49 mutex_lock(&tl->mutex);
51 struct i915_request *rq;
54 if (list_empty(&tl->requests))
57 rq = list_last_entry(&tl->requests, typeof(*rq), link);
60 timeout = i915_request_wait(rq, 0, HZ / 10);
64 i915_request_retire_upto(rq);
68 mutex_unlock(&tl->mutex);
73 static int __live_context_size(struct intel_engine_cs *engine)
75 struct intel_context *ce;
76 struct i915_request *rq;
80 ce = intel_context_create(engine);
84 err = intel_context_pin(ce);
88 vaddr = i915_gem_object_pin_map(ce->state->obj,
89 i915_coherent_map_type(engine->i915));
92 intel_context_unpin(ce);
97 * Note that execlists also applies a redzone which it checks on
98 * context unpin when debugging. We are using the same location
99 * and same poison value so that our checks overlap. Despite the
100 * redundancy, we want to keep this little selftest so that we
101 * get coverage of any and all submission backends, and we can
102 * always extend this test to ensure we trick the HW into a
103 * compromising position wrt to the various sections that need
104 * to be written into the context state.
106 * TLDR; this overlaps with the execlists redzone.
108 vaddr += engine->context_size - I915_GTT_PAGE_SIZE;
109 memset(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE);
111 rq = intel_context_create_request(ce);
112 intel_context_unpin(ce);
118 err = request_sync(rq);
122 /* Force the context switch */
123 rq = intel_engine_create_kernel_request(engine);
128 err = request_sync(rq);
132 if (memchr_inv(vaddr, POISON_INUSE, I915_GTT_PAGE_SIZE)) {
133 pr_err("%s context overwrote trailing red-zone!", engine->name);
138 i915_gem_object_unpin_map(ce->state->obj);
140 intel_context_put(ce);
144 static int live_context_size(void *arg)
146 struct intel_gt *gt = arg;
147 struct intel_engine_cs *engine;
148 enum intel_engine_id id;
152 * Check that our context sizes are correct by seeing if the
153 * HW tries to write past the end of one.
156 for_each_engine(engine, gt, id) {
158 struct drm_i915_gem_object *state;
162 if (!engine->context_size)
165 intel_engine_pm_get(engine);
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.
174 saved.state = fetch_and_zero(&engine->default_state);
175 saved.pinned = fetch_and_zero(&engine->pinned_default_state);
177 /* Overlaps with the execlists redzone */
178 engine->context_size += I915_GTT_PAGE_SIZE;
180 err = __live_context_size(engine);
182 engine->context_size -= I915_GTT_PAGE_SIZE;
184 engine->pinned_default_state = saved.pinned;
185 engine->default_state = saved.state;
187 intel_engine_pm_put(engine);
196 static int __live_active_context(struct intel_engine_cs *engine)
198 unsigned long saved_heartbeat;
199 struct intel_context *ce;
204 * We keep active contexts alive until after a subsequent context
205 * switch as the final write from the context-save will be after
206 * we retire the final request. We track when we unpin the context,
207 * under the presumption that the final pin is from the last request,
208 * and instead of immediately unpinning the context, we add a task
209 * to unpin the context from the next idle-barrier.
211 * This test makes sure that the context is kept alive until a
212 * subsequent idle-barrier (emitted when the engine wakeref hits 0
213 * with no more outstanding requests).
216 if (intel_engine_pm_is_awake(engine)) {
217 pr_err("%s is awake before starting %s!\n",
218 engine->name, __func__);
222 ce = intel_context_create(engine);
226 saved_heartbeat = engine->props.heartbeat_interval_ms;
227 engine->props.heartbeat_interval_ms = 0;
229 for (pass = 0; pass <= 2; pass++) {
230 struct i915_request *rq;
232 intel_engine_pm_get(engine);
234 rq = intel_context_create_request(ce);
240 err = request_sync(rq);
244 /* Context will be kept active until after an idle-barrier. */
245 if (i915_active_is_idle(&ce->active)) {
246 pr_err("context is not active; expected idle-barrier (%s pass %d)\n",
252 if (!intel_engine_pm_is_awake(engine)) {
253 pr_err("%s is asleep before idle-barrier\n",
260 intel_engine_pm_put(engine);
265 /* Now make sure our idle-barriers are flushed */
266 err = intel_engine_flush_barriers(engine);
270 /* Wait for the barrier and in the process wait for engine to park */
271 err = context_sync(engine->kernel_context);
275 if (!i915_active_is_idle(&ce->active)) {
276 pr_err("context is still active!");
280 intel_engine_pm_flush(engine);
282 if (intel_engine_pm_is_awake(engine)) {
283 struct drm_printer p = drm_debug_printer(__func__);
285 intel_engine_dump(engine, &p,
286 "%s is still awake:%d after idle-barriers\n",
288 atomic_read(&engine->wakeref.count));
296 engine->props.heartbeat_interval_ms = saved_heartbeat;
297 intel_context_put(ce);
301 static int live_active_context(void *arg)
303 struct intel_gt *gt = arg;
304 struct intel_engine_cs *engine;
305 enum intel_engine_id id;
308 for_each_engine(engine, gt, id) {
309 err = __live_active_context(engine);
313 err = igt_flush_test(gt->i915);
321 static int __remote_sync(struct intel_context *ce, struct intel_context *remote)
323 struct i915_request *rq;
326 err = intel_context_pin(remote);
330 rq = intel_context_create_request(ce);
336 err = intel_context_prepare_remote_request(remote, rq);
338 i915_request_add(rq);
342 err = request_sync(rq);
345 intel_context_unpin(remote);
349 static int __live_remote_context(struct intel_engine_cs *engine)
351 struct intel_context *local, *remote;
352 unsigned long saved_heartbeat;
357 * Check that our idle barriers do not interfere with normal
358 * activity tracking. In particular, check that operating
359 * on the context image remotely (intel_context_prepare_remote_request),
360 * which inserts foreign fences into intel_context.active, does not
361 * clobber the idle-barrier.
364 if (intel_engine_pm_is_awake(engine)) {
365 pr_err("%s is awake before starting %s!\n",
366 engine->name, __func__);
370 remote = intel_context_create(engine);
372 return PTR_ERR(remote);
374 local = intel_context_create(engine);
376 err = PTR_ERR(local);
380 saved_heartbeat = engine->props.heartbeat_interval_ms;
381 engine->props.heartbeat_interval_ms = 0;
382 intel_engine_pm_get(engine);
384 for (pass = 0; pass <= 2; pass++) {
385 err = __remote_sync(local, remote);
389 err = __remote_sync(engine->kernel_context, remote);
393 if (i915_active_is_idle(&remote->active)) {
394 pr_err("remote context is not active; expected idle-barrier (%s pass %d)\n",
401 intel_engine_pm_put(engine);
402 engine->props.heartbeat_interval_ms = saved_heartbeat;
404 intel_context_put(local);
406 intel_context_put(remote);
410 static int live_remote_context(void *arg)
412 struct intel_gt *gt = arg;
413 struct intel_engine_cs *engine;
414 enum intel_engine_id id;
417 for_each_engine(engine, gt, id) {
418 err = __live_remote_context(engine);
422 err = igt_flush_test(gt->i915);
430 int intel_context_live_selftests(struct drm_i915_private *i915)
432 static const struct i915_subtest tests[] = {
433 SUBTEST(live_context_size),
434 SUBTEST(live_active_context),
435 SUBTEST(live_remote_context),
437 struct intel_gt *gt = &i915->gt;
439 if (intel_gt_is_wedged(gt))
442 return intel_gt_live_subtests(tests, gt);