1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright �� 2021 Intel Corporation
4 */
5
6 #include "gt/intel_gt_print.h"
7 #include "intel_guc_print.h"
8 #include "selftests/igt_spinner.h"
9 #include "selftests/intel_scheduler_helpers.h"
10
request_add_spin(struct i915_request * rq,struct igt_spinner * spin)11 static int request_add_spin(struct i915_request *rq, struct igt_spinner *spin)
12 {
13 int err = 0;
14
15 i915_request_get(rq);
16 i915_request_add(rq);
17 if (spin && !igt_wait_for_spinner(spin, rq))
18 err = -ETIMEDOUT;
19
20 return err;
21 }
22
nop_user_request(struct intel_context * ce,struct i915_request * from)23 static struct i915_request *nop_user_request(struct intel_context *ce,
24 struct i915_request *from)
25 {
26 struct i915_request *rq;
27 int ret;
28
29 rq = intel_context_create_request(ce);
30 if (IS_ERR(rq))
31 return rq;
32
33 if (from) {
34 ret = i915_sw_fence_await_dma_fence(&rq->submit,
35 &from->fence, 0,
36 I915_FENCE_GFP);
37 if (ret < 0) {
38 i915_request_put(rq);
39 return ERR_PTR(ret);
40 }
41 }
42
43 i915_request_get(rq);
44 i915_request_add(rq);
45
46 return rq;
47 }
48
intel_guc_scrub_ctbs(void * arg)49 static int intel_guc_scrub_ctbs(void *arg)
50 {
51 struct intel_gt *gt = arg;
52 int ret = 0;
53 int i;
54 struct i915_request *last[3] = {NULL, NULL, NULL}, *rq;
55 intel_wakeref_t wakeref;
56 struct intel_engine_cs *engine;
57 struct intel_context *ce;
58
59 if (!intel_has_gpu_reset(gt))
60 return 0;
61
62 wakeref = intel_runtime_pm_get(gt->uncore->rpm);
63 engine = intel_selftest_find_any_engine(gt);
64
65 /* Submit requests and inject errors forcing G2H to be dropped */
66 for (i = 0; i < 3; ++i) {
67 ce = intel_context_create(engine);
68 if (IS_ERR(ce)) {
69 ret = PTR_ERR(ce);
70 gt_err(gt, "Failed to create context %d: %pe\n", i, ce);
71 goto err;
72 }
73
74 switch (i) {
75 case 0:
76 ce->drop_schedule_enable = true;
77 break;
78 case 1:
79 ce->drop_schedule_disable = true;
80 break;
81 case 2:
82 ce->drop_deregister = true;
83 break;
84 }
85
86 rq = nop_user_request(ce, NULL);
87 intel_context_put(ce);
88
89 if (IS_ERR(rq)) {
90 ret = PTR_ERR(rq);
91 gt_err(gt, "Failed to create request %d: %pe\n", i, rq);
92 goto err;
93 }
94
95 last[i] = rq;
96 }
97
98 for (i = 0; i < 3; ++i) {
99 ret = i915_request_wait(last[i], 0, HZ);
100 if (ret < 0) {
101 gt_err(gt, "Last request failed to complete: %pe\n", ERR_PTR(ret));
102 goto err;
103 }
104 i915_request_put(last[i]);
105 last[i] = NULL;
106 }
107
108 /* Force all H2G / G2H to be submitted / processed */
109 intel_gt_retire_requests(gt);
110 drm_msleep(500);
111
112 /* Scrub missing G2H */
113 intel_gt_handle_error(engine->gt, -1, 0, "selftest reset");
114
115 /* GT will not idle if G2H are lost */
116 ret = intel_gt_wait_for_idle(gt, HZ);
117 if (ret < 0) {
118 gt_err(gt, "GT failed to idle: %pe\n", ERR_PTR(ret));
119 goto err;
120 }
121
122 err:
123 for (i = 0; i < 3; ++i)
124 if (last[i])
125 i915_request_put(last[i]);
126 intel_runtime_pm_put(gt->uncore->rpm, wakeref);
127
128 return ret;
129 }
130
131 /*
132 * intel_guc_steal_guc_ids - Test to exhaust all guc_ids and then steal one
133 *
134 * This test creates a spinner which is used to block all subsequent submissions
135 * until it completes. Next, a loop creates a context and a NOP request each
136 * iteration until the guc_ids are exhausted (request creation returns -EAGAIN).
137 * The spinner is ended, unblocking all requests created in the loop. At this
138 * point all guc_ids are exhausted but are available to steal. Try to create
139 * another request which should successfully steal a guc_id. Wait on last
140 * request to complete, idle GPU, verify a guc_id was stolen via a counter, and
141 * exit the test. Test also artificially reduces the number of guc_ids so the
142 * test runs in a timely manner.
143 */
intel_guc_steal_guc_ids(void * arg)144 static int intel_guc_steal_guc_ids(void *arg)
145 {
146 struct intel_gt *gt = arg;
147 struct intel_guc *guc = >->uc.guc;
148 int ret, sv, context_index = 0;
149 intel_wakeref_t wakeref;
150 struct intel_engine_cs *engine;
151 struct intel_context **ce;
152 struct igt_spinner spin;
153 struct i915_request *spin_rq = NULL, *rq, *last = NULL;
154 int number_guc_id_stolen = guc->number_guc_id_stolen;
155
156 ce = kcalloc(GUC_MAX_CONTEXT_ID, sizeof(*ce), GFP_KERNEL);
157 if (!ce) {
158 guc_err(guc, "Context array allocation failed\n");
159 return -ENOMEM;
160 }
161
162 wakeref = intel_runtime_pm_get(gt->uncore->rpm);
163 engine = intel_selftest_find_any_engine(gt);
164 sv = guc->submission_state.num_guc_ids;
165 guc->submission_state.num_guc_ids = 512;
166
167 /* Create spinner to block requests in below loop */
168 ce[context_index] = intel_context_create(engine);
169 if (IS_ERR(ce[context_index])) {
170 ret = PTR_ERR(ce[context_index]);
171 guc_err(guc, "Failed to create context: %pe\n", ce[context_index]);
172 ce[context_index] = NULL;
173 goto err_wakeref;
174 }
175 ret = igt_spinner_init(&spin, engine->gt);
176 if (ret) {
177 guc_err(guc, "Failed to create spinner: %pe\n", ERR_PTR(ret));
178 goto err_contexts;
179 }
180 spin_rq = igt_spinner_create_request(&spin, ce[context_index],
181 MI_ARB_CHECK);
182 if (IS_ERR(spin_rq)) {
183 ret = PTR_ERR(spin_rq);
184 guc_err(guc, "Failed to create spinner request: %pe\n", spin_rq);
185 goto err_contexts;
186 }
187 ret = request_add_spin(spin_rq, &spin);
188 if (ret) {
189 guc_err(guc, "Failed to add Spinner request: %pe\n", ERR_PTR(ret));
190 goto err_spin_rq;
191 }
192
193 /* Use all guc_ids */
194 while (ret != -EAGAIN) {
195 ce[++context_index] = intel_context_create(engine);
196 if (IS_ERR(ce[context_index])) {
197 ret = PTR_ERR(ce[context_index]);
198 guc_err(guc, "Failed to create context: %pe\n", ce[context_index]);
199 ce[context_index--] = NULL;
200 goto err_spin_rq;
201 }
202
203 rq = nop_user_request(ce[context_index], spin_rq);
204 if (IS_ERR(rq)) {
205 ret = PTR_ERR(rq);
206 rq = NULL;
207 if ((ret != -EAGAIN) || !last) {
208 guc_err(guc, "Failed to create %srequest %d: %pe\n",
209 last ? "" : "first ", context_index, ERR_PTR(ret));
210 goto err_spin_rq;
211 }
212 } else {
213 if (last)
214 i915_request_put(last);
215 last = rq;
216 }
217 }
218
219 /* Release blocked requests */
220 igt_spinner_end(&spin);
221 ret = intel_selftest_wait_for_rq(spin_rq);
222 if (ret) {
223 guc_err(guc, "Spin request failed to complete: %pe\n", ERR_PTR(ret));
224 i915_request_put(last);
225 goto err_spin_rq;
226 }
227 i915_request_put(spin_rq);
228 igt_spinner_fini(&spin);
229 spin_rq = NULL;
230
231 /* Wait for last request */
232 ret = i915_request_wait(last, 0, HZ * 30);
233 i915_request_put(last);
234 if (ret < 0) {
235 guc_err(guc, "Last request failed to complete: %pe\n", ERR_PTR(ret));
236 goto err_spin_rq;
237 }
238
239 /* Try to steal guc_id */
240 rq = nop_user_request(ce[context_index], NULL);
241 if (IS_ERR(rq)) {
242 ret = PTR_ERR(rq);
243 guc_err(guc, "Failed to steal guc_id %d: %pe\n", context_index, rq);
244 goto err_spin_rq;
245 }
246
247 /* Wait for request with stolen guc_id */
248 ret = i915_request_wait(rq, 0, HZ);
249 i915_request_put(rq);
250 if (ret < 0) {
251 guc_err(guc, "Request with stolen guc_id failed to complete: %pe\n", ERR_PTR(ret));
252 goto err_spin_rq;
253 }
254
255 /* Wait for idle */
256 ret = intel_gt_wait_for_idle(gt, HZ * 30);
257 if (ret < 0) {
258 guc_err(guc, "GT failed to idle: %pe\n", ERR_PTR(ret));
259 goto err_spin_rq;
260 }
261
262 /* Verify a guc_id was stolen */
263 if (guc->number_guc_id_stolen == number_guc_id_stolen) {
264 guc_err(guc, "No guc_id was stolen");
265 ret = -EINVAL;
266 } else {
267 ret = 0;
268 }
269
270 err_spin_rq:
271 if (spin_rq) {
272 igt_spinner_end(&spin);
273 intel_selftest_wait_for_rq(spin_rq);
274 i915_request_put(spin_rq);
275 igt_spinner_fini(&spin);
276 intel_gt_wait_for_idle(gt, HZ * 30);
277 }
278 err_contexts:
279 for (; context_index >= 0 && ce[context_index]; --context_index)
280 intel_context_put(ce[context_index]);
281 err_wakeref:
282 intel_runtime_pm_put(gt->uncore->rpm, wakeref);
283 kfree(ce);
284 guc->submission_state.num_guc_ids = sv;
285
286 return ret;
287 }
288
intel_guc_live_selftests(struct drm_i915_private * i915)289 int intel_guc_live_selftests(struct drm_i915_private *i915)
290 {
291 static const struct i915_subtest tests[] = {
292 SUBTEST(intel_guc_scrub_ctbs),
293 SUBTEST(intel_guc_steal_guc_ids),
294 };
295 struct intel_gt *gt = to_gt(i915);
296
297 if (intel_gt_is_wedged(gt))
298 return 0;
299
300 if (!intel_uc_uses_guc_submission(>->uc))
301 return 0;
302
303 return intel_gt_live_subtests(tests, gt);
304 }
305