1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2018 Intel Corporation
4 */
5
6 #include <linux/prime_numbers.h>
7
8 #include "i915_selftest.h"
9 #include "intel_engine_heartbeat.h"
10 #include "intel_engine_pm.h"
11 #include "intel_reset.h"
12 #include "intel_ring.h"
13 #include "selftest_engine_heartbeat.h"
14 #include "selftests/i915_random.h"
15 #include "selftests/igt_flush_test.h"
16 #include "selftests/igt_live_test.h"
17 #include "selftests/igt_spinner.h"
18 #include "selftests/lib_sw_fence.h"
19 #include "shmem_utils.h"
20
21 #include "gem/selftests/igt_gem_utils.h"
22 #include "gem/selftests/mock_context.h"
23
24 #define CS_GPR(engine, n) ((engine)->mmio_base + 0x600 + (n) * 4)
25 #define NUM_GPR 16
26 #define NUM_GPR_DW (NUM_GPR * 2) /* each GPR is 2 dwords */
27
create_scratch(struct intel_gt * gt)28 static struct i915_vma *create_scratch(struct intel_gt *gt)
29 {
30 return __vm_create_scratch_for_read_pinned(>->ggtt->vm, PAGE_SIZE);
31 }
32
is_active(struct i915_request * rq)33 static bool is_active(struct i915_request *rq)
34 {
35 if (i915_request_is_active(rq))
36 return true;
37
38 if (i915_request_on_hold(rq))
39 return true;
40
41 if (i915_request_has_initial_breadcrumb(rq) && i915_request_started(rq))
42 return true;
43
44 return false;
45 }
46
wait_for_submit(struct intel_engine_cs * engine,struct i915_request * rq,unsigned long timeout)47 static int wait_for_submit(struct intel_engine_cs *engine,
48 struct i915_request *rq,
49 unsigned long timeout)
50 {
51 /* Ignore our own attempts to suppress excess tasklets */
52 tasklet_hi_schedule(&engine->sched_engine->tasklet);
53
54 timeout += jiffies;
55 do {
56 bool done = time_after(jiffies, timeout);
57
58 if (i915_request_completed(rq)) /* that was quick! */
59 return 0;
60
61 /* Wait until the HW has acknowleged the submission (or err) */
62 intel_engine_flush_submission(engine);
63 if (!READ_ONCE(engine->execlists.pending[0]) && is_active(rq))
64 return 0;
65
66 if (done)
67 return -ETIME;
68
69 cond_resched();
70 } while (1);
71 }
72
emit_semaphore_signal(struct intel_context * ce,void * slot)73 static int emit_semaphore_signal(struct intel_context *ce, void *slot)
74 {
75 const u32 offset =
76 i915_ggtt_offset(ce->engine->status_page.vma) +
77 offset_in_page(slot);
78 struct i915_request *rq;
79 u32 *cs;
80
81 rq = intel_context_create_request(ce);
82 if (IS_ERR(rq))
83 return PTR_ERR(rq);
84
85 cs = intel_ring_begin(rq, 4);
86 if (IS_ERR(cs)) {
87 i915_request_add(rq);
88 return PTR_ERR(cs);
89 }
90
91 *cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
92 *cs++ = offset;
93 *cs++ = 0;
94 *cs++ = 1;
95
96 intel_ring_advance(rq, cs);
97
98 rq->sched.attr.priority = I915_PRIORITY_BARRIER;
99 i915_request_add(rq);
100 return 0;
101 }
102
context_flush(struct intel_context * ce,long timeout)103 static int context_flush(struct intel_context *ce, long timeout)
104 {
105 struct i915_request *rq;
106 struct dma_fence *fence;
107 int err = 0;
108
109 rq = intel_engine_create_kernel_request(ce->engine);
110 if (IS_ERR(rq))
111 return PTR_ERR(rq);
112
113 fence = i915_active_fence_get(&ce->timeline->last_request);
114 if (fence) {
115 i915_request_await_dma_fence(rq, fence);
116 dma_fence_put(fence);
117 }
118
119 rq = i915_request_get(rq);
120 i915_request_add(rq);
121 if (i915_request_wait(rq, 0, timeout) < 0)
122 err = -ETIME;
123 i915_request_put(rq);
124
125 rmb(); /* We know the request is written, make sure all state is too! */
126 return err;
127 }
128
live_lrc_layout(void * arg)129 static int live_lrc_layout(void *arg)
130 {
131 struct intel_gt *gt = arg;
132 struct intel_engine_cs *engine;
133 enum intel_engine_id id;
134 u32 *lrc;
135 int err;
136
137 /*
138 * Check the registers offsets we use to create the initial reg state
139 * match the layout saved by HW.
140 */
141
142 lrc = (u32 *)__get_free_page(GFP_KERNEL); /* requires page alignment */
143 if (!lrc)
144 return -ENOMEM;
145 GEM_BUG_ON(offset_in_page(lrc));
146
147 err = 0;
148 for_each_engine(engine, gt, id) {
149 u32 *hw;
150 int dw;
151
152 if (!engine->default_state)
153 continue;
154
155 hw = shmem_pin_map(engine->default_state);
156 if (IS_ERR(hw)) {
157 err = PTR_ERR(hw);
158 break;
159 }
160 hw += LRC_STATE_OFFSET / sizeof(*hw);
161
162 __lrc_init_regs(memset(lrc, POISON_INUSE, PAGE_SIZE),
163 engine->kernel_context, engine, true);
164
165 dw = 0;
166 do {
167 u32 lri = READ_ONCE(hw[dw]);
168
169 if (lri == 0) {
170 dw++;
171 continue;
172 }
173
174 if (lrc[dw] == 0) {
175 pr_debug("%s: skipped instruction %x at dword %d\n",
176 engine->name, lri, dw);
177 dw++;
178 continue;
179 }
180
181 if ((lri & GENMASK(31, 23)) != MI_INSTR(0x22, 0)) {
182 pr_err("%s: Expected LRI command at dword %d, found %08x\n",
183 engine->name, dw, lri);
184 err = -EINVAL;
185 break;
186 }
187
188 if (lrc[dw] != lri) {
189 pr_err("%s: LRI command mismatch at dword %d, expected %08x found %08x\n",
190 engine->name, dw, lri, lrc[dw]);
191 err = -EINVAL;
192 break;
193 }
194
195 lri &= 0x7f;
196 lri++;
197 dw++;
198
199 while (lri) {
200 u32 offset = READ_ONCE(hw[dw]);
201
202 if (offset != lrc[dw]) {
203 pr_err("%s: Different registers found at dword %d, expected %x, found %x\n",
204 engine->name, dw, offset, lrc[dw]);
205 err = -EINVAL;
206 break;
207 }
208
209 /*
210 * Skip over the actual register value as we
211 * expect that to differ.
212 */
213 dw += 2;
214 lri -= 2;
215 }
216 } while (!err && (lrc[dw] & ~BIT(0)) != MI_BATCH_BUFFER_END);
217
218 if (err) {
219 pr_info("%s: HW register image:\n", engine->name);
220 igt_hexdump(hw, PAGE_SIZE);
221
222 pr_info("%s: SW register image:\n", engine->name);
223 igt_hexdump(lrc, PAGE_SIZE);
224 }
225
226 shmem_unpin_map(engine->default_state, hw);
227 if (err)
228 break;
229 }
230
231 free_page((unsigned long)lrc);
232 return err;
233 }
234
find_offset(const u32 * lri,u32 offset)235 static int find_offset(const u32 *lri, u32 offset)
236 {
237 int i;
238
239 for (i = 0; i < PAGE_SIZE / sizeof(u32); i++)
240 if (lri[i] == offset)
241 return i;
242
243 return -1;
244 }
245
live_lrc_fixed(void * arg)246 static int live_lrc_fixed(void *arg)
247 {
248 struct intel_gt *gt = arg;
249 struct intel_engine_cs *engine;
250 enum intel_engine_id id;
251 int err = 0;
252
253 /*
254 * Check the assumed register offsets match the actual locations in
255 * the context image.
256 */
257
258 for_each_engine(engine, gt, id) {
259 const struct {
260 u32 reg;
261 u32 offset;
262 const char *name;
263 } tbl[] = {
264 {
265 i915_mmio_reg_offset(RING_START(engine->mmio_base)),
266 CTX_RING_START - 1,
267 "RING_START"
268 },
269 {
270 i915_mmio_reg_offset(RING_CTL(engine->mmio_base)),
271 CTX_RING_CTL - 1,
272 "RING_CTL"
273 },
274 {
275 i915_mmio_reg_offset(RING_HEAD(engine->mmio_base)),
276 CTX_RING_HEAD - 1,
277 "RING_HEAD"
278 },
279 {
280 i915_mmio_reg_offset(RING_TAIL(engine->mmio_base)),
281 CTX_RING_TAIL - 1,
282 "RING_TAIL"
283 },
284 {
285 i915_mmio_reg_offset(RING_MI_MODE(engine->mmio_base)),
286 lrc_ring_mi_mode(engine),
287 "RING_MI_MODE"
288 },
289 {
290 i915_mmio_reg_offset(RING_BBSTATE(engine->mmio_base)),
291 CTX_BB_STATE - 1,
292 "BB_STATE"
293 },
294 {
295 i915_mmio_reg_offset(RING_BB_PER_CTX_PTR(engine->mmio_base)),
296 lrc_ring_wa_bb_per_ctx(engine),
297 "RING_BB_PER_CTX_PTR"
298 },
299 {
300 i915_mmio_reg_offset(RING_INDIRECT_CTX(engine->mmio_base)),
301 lrc_ring_indirect_ptr(engine),
302 "RING_INDIRECT_CTX_PTR"
303 },
304 {
305 i915_mmio_reg_offset(RING_INDIRECT_CTX_OFFSET(engine->mmio_base)),
306 lrc_ring_indirect_offset(engine),
307 "RING_INDIRECT_CTX_OFFSET"
308 },
309 {
310 i915_mmio_reg_offset(RING_CTX_TIMESTAMP(engine->mmio_base)),
311 CTX_TIMESTAMP - 1,
312 "RING_CTX_TIMESTAMP"
313 },
314 {
315 i915_mmio_reg_offset(GEN8_RING_CS_GPR(engine->mmio_base, 0)),
316 lrc_ring_gpr0(engine),
317 "RING_CS_GPR0"
318 },
319 {
320 i915_mmio_reg_offset(RING_CMD_BUF_CCTL(engine->mmio_base)),
321 lrc_ring_cmd_buf_cctl(engine),
322 "RING_CMD_BUF_CCTL"
323 },
324 { },
325 }, *t;
326 u32 *hw;
327
328 if (!engine->default_state)
329 continue;
330
331 hw = shmem_pin_map(engine->default_state);
332 if (IS_ERR(hw)) {
333 err = PTR_ERR(hw);
334 break;
335 }
336 hw += LRC_STATE_OFFSET / sizeof(*hw);
337
338 for (t = tbl; t->name; t++) {
339 int dw = find_offset(hw, t->reg);
340
341 if (dw != t->offset) {
342 pr_err("%s: Offset for %s [0x%x] mismatch, found %x, expected %x\n",
343 engine->name,
344 t->name,
345 t->reg,
346 dw,
347 t->offset);
348 err = -EINVAL;
349 }
350 }
351
352 shmem_unpin_map(engine->default_state, hw);
353 }
354
355 return err;
356 }
357
__live_lrc_state(struct intel_engine_cs * engine,struct i915_vma * scratch)358 static int __live_lrc_state(struct intel_engine_cs *engine,
359 struct i915_vma *scratch)
360 {
361 struct intel_context *ce;
362 struct i915_request *rq;
363 struct i915_gem_ww_ctx ww;
364 enum {
365 RING_START_IDX = 0,
366 RING_TAIL_IDX,
367 MAX_IDX
368 };
369 u32 expected[MAX_IDX];
370 u32 *cs;
371 int err;
372 int n;
373
374 ce = intel_context_create(engine);
375 if (IS_ERR(ce))
376 return PTR_ERR(ce);
377
378 i915_gem_ww_ctx_init(&ww, false);
379 retry:
380 err = i915_gem_object_lock(scratch->obj, &ww);
381 if (!err)
382 err = intel_context_pin_ww(ce, &ww);
383 if (err)
384 goto err_put;
385
386 rq = i915_request_create(ce);
387 if (IS_ERR(rq)) {
388 err = PTR_ERR(rq);
389 goto err_unpin;
390 }
391
392 cs = intel_ring_begin(rq, 4 * MAX_IDX);
393 if (IS_ERR(cs)) {
394 err = PTR_ERR(cs);
395 i915_request_add(rq);
396 goto err_unpin;
397 }
398
399 *cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT;
400 *cs++ = i915_mmio_reg_offset(RING_START(engine->mmio_base));
401 *cs++ = i915_ggtt_offset(scratch) + RING_START_IDX * sizeof(u32);
402 *cs++ = 0;
403
404 expected[RING_START_IDX] = i915_ggtt_offset(ce->ring->vma);
405
406 *cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT;
407 *cs++ = i915_mmio_reg_offset(RING_TAIL(engine->mmio_base));
408 *cs++ = i915_ggtt_offset(scratch) + RING_TAIL_IDX * sizeof(u32);
409 *cs++ = 0;
410
411 err = i915_request_await_object(rq, scratch->obj, true);
412 if (!err)
413 err = i915_vma_move_to_active(scratch, rq, EXEC_OBJECT_WRITE);
414
415 i915_request_get(rq);
416 i915_request_add(rq);
417 if (err)
418 goto err_rq;
419
420 intel_engine_flush_submission(engine);
421 expected[RING_TAIL_IDX] = ce->ring->tail;
422
423 if (i915_request_wait(rq, 0, HZ / 5) < 0) {
424 err = -ETIME;
425 goto err_rq;
426 }
427
428 cs = i915_gem_object_pin_map(scratch->obj, I915_MAP_WB);
429 if (IS_ERR(cs)) {
430 err = PTR_ERR(cs);
431 goto err_rq;
432 }
433
434 for (n = 0; n < MAX_IDX; n++) {
435 if (cs[n] != expected[n]) {
436 pr_err("%s: Stored register[%d] value[0x%x] did not match expected[0x%x]\n",
437 engine->name, n, cs[n], expected[n]);
438 err = -EINVAL;
439 break;
440 }
441 }
442
443 i915_gem_object_unpin_map(scratch->obj);
444
445 err_rq:
446 i915_request_put(rq);
447 err_unpin:
448 intel_context_unpin(ce);
449 err_put:
450 if (err == -EDEADLK) {
451 err = i915_gem_ww_ctx_backoff(&ww);
452 if (!err)
453 goto retry;
454 }
455 i915_gem_ww_ctx_fini(&ww);
456 intel_context_put(ce);
457 return err;
458 }
459
live_lrc_state(void * arg)460 static int live_lrc_state(void *arg)
461 {
462 struct intel_gt *gt = arg;
463 struct intel_engine_cs *engine;
464 struct i915_vma *scratch;
465 enum intel_engine_id id;
466 int err = 0;
467
468 /*
469 * Check the live register state matches what we expect for this
470 * intel_context.
471 */
472
473 scratch = create_scratch(gt);
474 if (IS_ERR(scratch))
475 return PTR_ERR(scratch);
476
477 for_each_engine(engine, gt, id) {
478 err = __live_lrc_state(engine, scratch);
479 if (err)
480 break;
481 }
482
483 if (igt_flush_test(gt->i915))
484 err = -EIO;
485
486 i915_vma_unpin_and_release(&scratch, 0);
487 return err;
488 }
489
gpr_make_dirty(struct intel_context * ce)490 static int gpr_make_dirty(struct intel_context *ce)
491 {
492 struct i915_request *rq;
493 u32 *cs;
494 int n;
495
496 rq = intel_context_create_request(ce);
497 if (IS_ERR(rq))
498 return PTR_ERR(rq);
499
500 cs = intel_ring_begin(rq, 2 * NUM_GPR_DW + 2);
501 if (IS_ERR(cs)) {
502 i915_request_add(rq);
503 return PTR_ERR(cs);
504 }
505
506 *cs++ = MI_LOAD_REGISTER_IMM(NUM_GPR_DW);
507 for (n = 0; n < NUM_GPR_DW; n++) {
508 *cs++ = CS_GPR(ce->engine, n);
509 *cs++ = STACK_MAGIC;
510 }
511 *cs++ = MI_NOOP;
512
513 intel_ring_advance(rq, cs);
514
515 rq->sched.attr.priority = I915_PRIORITY_BARRIER;
516 i915_request_add(rq);
517
518 return 0;
519 }
520
521 static struct i915_request *
__gpr_read(struct intel_context * ce,struct i915_vma * scratch,u32 * slot)522 __gpr_read(struct intel_context *ce, struct i915_vma *scratch, u32 *slot)
523 {
524 const u32 offset =
525 i915_ggtt_offset(ce->engine->status_page.vma) +
526 offset_in_page(slot);
527 struct i915_request *rq;
528 u32 *cs;
529 int err;
530 int n;
531
532 rq = intel_context_create_request(ce);
533 if (IS_ERR(rq))
534 return rq;
535
536 cs = intel_ring_begin(rq, 6 + 4 * NUM_GPR_DW);
537 if (IS_ERR(cs)) {
538 i915_request_add(rq);
539 return ERR_CAST(cs);
540 }
541
542 *cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
543 *cs++ = MI_NOOP;
544
545 *cs++ = MI_SEMAPHORE_WAIT |
546 MI_SEMAPHORE_GLOBAL_GTT |
547 MI_SEMAPHORE_POLL |
548 MI_SEMAPHORE_SAD_NEQ_SDD;
549 *cs++ = 0;
550 *cs++ = offset;
551 *cs++ = 0;
552
553 for (n = 0; n < NUM_GPR_DW; n++) {
554 *cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT;
555 *cs++ = CS_GPR(ce->engine, n);
556 *cs++ = i915_ggtt_offset(scratch) + n * sizeof(u32);
557 *cs++ = 0;
558 }
559
560 i915_vma_lock(scratch);
561 err = i915_request_await_object(rq, scratch->obj, true);
562 if (!err)
563 err = i915_vma_move_to_active(scratch, rq, EXEC_OBJECT_WRITE);
564 i915_vma_unlock(scratch);
565
566 i915_request_get(rq);
567 i915_request_add(rq);
568 if (err) {
569 i915_request_put(rq);
570 rq = ERR_PTR(err);
571 }
572
573 return rq;
574 }
575
__live_lrc_gpr(struct intel_engine_cs * engine,struct i915_vma * scratch,bool preempt)576 static int __live_lrc_gpr(struct intel_engine_cs *engine,
577 struct i915_vma *scratch,
578 bool preempt)
579 {
580 u32 *slot = memset32(engine->status_page.addr + 1000, 0, 4);
581 struct intel_context *ce;
582 struct i915_request *rq;
583 u32 *cs;
584 int err;
585 int n;
586
587 if (GRAPHICS_VER(engine->i915) < 9 && engine->class != RENDER_CLASS)
588 return 0; /* GPR only on rcs0 for gen8 */
589
590 err = gpr_make_dirty(engine->kernel_context);
591 if (err)
592 return err;
593
594 ce = intel_context_create(engine);
595 if (IS_ERR(ce))
596 return PTR_ERR(ce);
597
598 rq = __gpr_read(ce, scratch, slot);
599 if (IS_ERR(rq)) {
600 err = PTR_ERR(rq);
601 goto err_put;
602 }
603
604 err = wait_for_submit(engine, rq, HZ / 2);
605 if (err)
606 goto err_rq;
607
608 if (preempt) {
609 err = gpr_make_dirty(engine->kernel_context);
610 if (err)
611 goto err_rq;
612
613 err = emit_semaphore_signal(engine->kernel_context, slot);
614 if (err)
615 goto err_rq;
616
617 err = wait_for_submit(engine, rq, HZ / 2);
618 if (err)
619 goto err_rq;
620 } else {
621 slot[0] = 1;
622 wmb();
623 }
624
625 if (i915_request_wait(rq, 0, HZ / 5) < 0) {
626 err = -ETIME;
627 goto err_rq;
628 }
629
630 cs = i915_gem_object_pin_map_unlocked(scratch->obj, I915_MAP_WB);
631 if (IS_ERR(cs)) {
632 err = PTR_ERR(cs);
633 goto err_rq;
634 }
635
636 for (n = 0; n < NUM_GPR_DW; n++) {
637 if (cs[n]) {
638 pr_err("%s: GPR[%d].%s was not zero, found 0x%08x!\n",
639 engine->name,
640 n / 2, n & 1 ? "udw" : "ldw",
641 cs[n]);
642 err = -EINVAL;
643 break;
644 }
645 }
646
647 i915_gem_object_unpin_map(scratch->obj);
648
649 err_rq:
650 memset32(&slot[0], -1, 4);
651 wmb();
652 i915_request_put(rq);
653 err_put:
654 intel_context_put(ce);
655 return err;
656 }
657
live_lrc_gpr(void * arg)658 static int live_lrc_gpr(void *arg)
659 {
660 struct intel_gt *gt = arg;
661 struct intel_engine_cs *engine;
662 struct i915_vma *scratch;
663 enum intel_engine_id id;
664 int err = 0;
665
666 /*
667 * Check that GPR registers are cleared in new contexts as we need
668 * to avoid leaking any information from previous contexts.
669 */
670
671 scratch = create_scratch(gt);
672 if (IS_ERR(scratch))
673 return PTR_ERR(scratch);
674
675 for_each_engine(engine, gt, id) {
676 st_engine_heartbeat_disable(engine);
677
678 err = __live_lrc_gpr(engine, scratch, false);
679 if (err)
680 goto err;
681
682 err = __live_lrc_gpr(engine, scratch, true);
683 if (err)
684 goto err;
685
686 err:
687 st_engine_heartbeat_enable(engine);
688 if (igt_flush_test(gt->i915))
689 err = -EIO;
690 if (err)
691 break;
692 }
693
694 i915_vma_unpin_and_release(&scratch, 0);
695 return err;
696 }
697
698 static struct i915_request *
create_timestamp(struct intel_context * ce,void * slot,int idx)699 create_timestamp(struct intel_context *ce, void *slot, int idx)
700 {
701 const u32 offset =
702 i915_ggtt_offset(ce->engine->status_page.vma) +
703 offset_in_page(slot);
704 struct i915_request *rq;
705 u32 *cs;
706 int err;
707
708 rq = intel_context_create_request(ce);
709 if (IS_ERR(rq))
710 return rq;
711
712 cs = intel_ring_begin(rq, 10);
713 if (IS_ERR(cs)) {
714 err = PTR_ERR(cs);
715 goto err;
716 }
717
718 *cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
719 *cs++ = MI_NOOP;
720
721 *cs++ = MI_SEMAPHORE_WAIT |
722 MI_SEMAPHORE_GLOBAL_GTT |
723 MI_SEMAPHORE_POLL |
724 MI_SEMAPHORE_SAD_NEQ_SDD;
725 *cs++ = 0;
726 *cs++ = offset;
727 *cs++ = 0;
728
729 *cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT;
730 *cs++ = i915_mmio_reg_offset(RING_CTX_TIMESTAMP(rq->engine->mmio_base));
731 *cs++ = offset + idx * sizeof(u32);
732 *cs++ = 0;
733
734 intel_ring_advance(rq, cs);
735
736 err = 0;
737 err:
738 i915_request_get(rq);
739 i915_request_add(rq);
740 if (err) {
741 i915_request_put(rq);
742 return ERR_PTR(err);
743 }
744
745 return rq;
746 }
747
748 struct lrc_timestamp {
749 struct intel_engine_cs *engine;
750 struct intel_context *ce[2];
751 u32 poison;
752 };
753
timestamp_advanced(u32 start,u32 end)754 static bool timestamp_advanced(u32 start, u32 end)
755 {
756 return (s32)(end - start) > 0;
757 }
758
__lrc_timestamp(const struct lrc_timestamp * arg,bool preempt)759 static int __lrc_timestamp(const struct lrc_timestamp *arg, bool preempt)
760 {
761 u32 *slot = memset32(arg->engine->status_page.addr + 1000, 0, 4);
762 struct i915_request *rq;
763 u32 timestamp;
764 int err = 0;
765
766 arg->ce[0]->lrc_reg_state[CTX_TIMESTAMP] = arg->poison;
767 rq = create_timestamp(arg->ce[0], slot, 1);
768 if (IS_ERR(rq))
769 return PTR_ERR(rq);
770
771 err = wait_for_submit(rq->engine, rq, HZ / 2);
772 if (err)
773 goto err;
774
775 if (preempt) {
776 arg->ce[1]->lrc_reg_state[CTX_TIMESTAMP] = 0xdeadbeef;
777 err = emit_semaphore_signal(arg->ce[1], slot);
778 if (err)
779 goto err;
780 } else {
781 slot[0] = 1;
782 wmb();
783 }
784
785 /* And wait for switch to kernel (to save our context to memory) */
786 err = context_flush(arg->ce[0], HZ / 2);
787 if (err)
788 goto err;
789
790 if (!timestamp_advanced(arg->poison, slot[1])) {
791 pr_err("%s(%s): invalid timestamp on restore, context:%x, request:%x\n",
792 arg->engine->name, preempt ? "preempt" : "simple",
793 arg->poison, slot[1]);
794 err = -EINVAL;
795 }
796
797 timestamp = READ_ONCE(arg->ce[0]->lrc_reg_state[CTX_TIMESTAMP]);
798 if (!timestamp_advanced(slot[1], timestamp)) {
799 pr_err("%s(%s): invalid timestamp on save, request:%x, context:%x\n",
800 arg->engine->name, preempt ? "preempt" : "simple",
801 slot[1], timestamp);
802 err = -EINVAL;
803 }
804
805 err:
806 memset32(slot, -1, 4);
807 i915_request_put(rq);
808 return err;
809 }
810
live_lrc_timestamp(void * arg)811 static int live_lrc_timestamp(void *arg)
812 {
813 struct lrc_timestamp data = {};
814 struct intel_gt *gt = arg;
815 enum intel_engine_id id;
816 const u32 poison[] = {
817 0,
818 S32_MAX,
819 (u32)S32_MAX + 1,
820 U32_MAX,
821 };
822
823 /*
824 * We want to verify that the timestamp is saved and restore across
825 * context switches and is monotonic.
826 *
827 * So we do this with a little bit of LRC poisoning to check various
828 * boundary conditions, and see what happens if we preempt the context
829 * with a second request (carrying more poison into the timestamp).
830 */
831
832 for_each_engine(data.engine, gt, id) {
833 int i, err = 0;
834
835 st_engine_heartbeat_disable(data.engine);
836
837 for (i = 0; i < ARRAY_SIZE(data.ce); i++) {
838 struct intel_context *tmp;
839
840 tmp = intel_context_create(data.engine);
841 if (IS_ERR(tmp)) {
842 err = PTR_ERR(tmp);
843 goto err;
844 }
845
846 err = intel_context_pin(tmp);
847 if (err) {
848 intel_context_put(tmp);
849 goto err;
850 }
851
852 data.ce[i] = tmp;
853 }
854
855 for (i = 0; i < ARRAY_SIZE(poison); i++) {
856 data.poison = poison[i];
857
858 err = __lrc_timestamp(&data, false);
859 if (err)
860 break;
861
862 err = __lrc_timestamp(&data, true);
863 if (err)
864 break;
865 }
866
867 err:
868 st_engine_heartbeat_enable(data.engine);
869 for (i = 0; i < ARRAY_SIZE(data.ce); i++) {
870 if (!data.ce[i])
871 break;
872
873 intel_context_unpin(data.ce[i]);
874 intel_context_put(data.ce[i]);
875 }
876
877 if (igt_flush_test(gt->i915))
878 err = -EIO;
879 if (err)
880 return err;
881 }
882
883 return 0;
884 }
885
886 static struct i915_vma *
create_user_vma(struct i915_address_space * vm,unsigned long size)887 create_user_vma(struct i915_address_space *vm, unsigned long size)
888 {
889 struct drm_i915_gem_object *obj;
890 struct i915_vma *vma;
891 int err;
892
893 obj = i915_gem_object_create_internal(vm->i915, size);
894 if (IS_ERR(obj))
895 return ERR_CAST(obj);
896
897 vma = i915_vma_instance(obj, vm, NULL);
898 if (IS_ERR(vma)) {
899 i915_gem_object_put(obj);
900 return vma;
901 }
902
903 err = i915_vma_pin(vma, 0, 0, PIN_USER);
904 if (err) {
905 i915_gem_object_put(obj);
906 return ERR_PTR(err);
907 }
908
909 return vma;
910 }
911
912 static struct i915_vma *
store_context(struct intel_context * ce,struct i915_vma * scratch)913 store_context(struct intel_context *ce, struct i915_vma *scratch)
914 {
915 struct i915_vma *batch;
916 u32 dw, x, *cs, *hw;
917 u32 *defaults;
918
919 batch = create_user_vma(ce->vm, SZ_64K);
920 if (IS_ERR(batch))
921 return batch;
922
923 cs = i915_gem_object_pin_map_unlocked(batch->obj, I915_MAP_WC);
924 if (IS_ERR(cs)) {
925 i915_vma_put(batch);
926 return ERR_CAST(cs);
927 }
928
929 defaults = shmem_pin_map(ce->engine->default_state);
930 if (!defaults) {
931 i915_gem_object_unpin_map(batch->obj);
932 i915_vma_put(batch);
933 return ERR_PTR(-ENOMEM);
934 }
935
936 x = 0;
937 dw = 0;
938 hw = defaults;
939 hw += LRC_STATE_OFFSET / sizeof(*hw);
940 do {
941 u32 len = hw[dw] & 0x7f;
942
943 if (hw[dw] == 0) {
944 dw++;
945 continue;
946 }
947
948 if ((hw[dw] & GENMASK(31, 23)) != MI_INSTR(0x22, 0)) {
949 dw += len + 2;
950 continue;
951 }
952
953 dw++;
954 len = (len + 1) / 2;
955 while (len--) {
956 *cs++ = MI_STORE_REGISTER_MEM_GEN8;
957 *cs++ = hw[dw];
958 *cs++ = lower_32_bits(scratch->node.start + x);
959 *cs++ = upper_32_bits(scratch->node.start + x);
960
961 dw += 2;
962 x += 4;
963 }
964 } while (dw < PAGE_SIZE / sizeof(u32) &&
965 (hw[dw] & ~BIT(0)) != MI_BATCH_BUFFER_END);
966
967 *cs++ = MI_BATCH_BUFFER_END;
968
969 shmem_unpin_map(ce->engine->default_state, defaults);
970
971 i915_gem_object_flush_map(batch->obj);
972 i915_gem_object_unpin_map(batch->obj);
973
974 return batch;
975 }
976
move_to_active(struct i915_request * rq,struct i915_vma * vma,unsigned int flags)977 static int move_to_active(struct i915_request *rq,
978 struct i915_vma *vma,
979 unsigned int flags)
980 {
981 int err;
982
983 i915_vma_lock(vma);
984 err = i915_request_await_object(rq, vma->obj, flags);
985 if (!err)
986 err = i915_vma_move_to_active(vma, rq, flags);
987 i915_vma_unlock(vma);
988
989 return err;
990 }
991
992 static struct i915_request *
record_registers(struct intel_context * ce,struct i915_vma * before,struct i915_vma * after,u32 * sema)993 record_registers(struct intel_context *ce,
994 struct i915_vma *before,
995 struct i915_vma *after,
996 u32 *sema)
997 {
998 struct i915_vma *b_before, *b_after;
999 struct i915_request *rq;
1000 u32 *cs;
1001 int err;
1002
1003 b_before = store_context(ce, before);
1004 if (IS_ERR(b_before))
1005 return ERR_CAST(b_before);
1006
1007 b_after = store_context(ce, after);
1008 if (IS_ERR(b_after)) {
1009 rq = ERR_CAST(b_after);
1010 goto err_before;
1011 }
1012
1013 rq = intel_context_create_request(ce);
1014 if (IS_ERR(rq))
1015 goto err_after;
1016
1017 err = move_to_active(rq, before, EXEC_OBJECT_WRITE);
1018 if (err)
1019 goto err_rq;
1020
1021 err = move_to_active(rq, b_before, 0);
1022 if (err)
1023 goto err_rq;
1024
1025 err = move_to_active(rq, after, EXEC_OBJECT_WRITE);
1026 if (err)
1027 goto err_rq;
1028
1029 err = move_to_active(rq, b_after, 0);
1030 if (err)
1031 goto err_rq;
1032
1033 cs = intel_ring_begin(rq, 14);
1034 if (IS_ERR(cs)) {
1035 err = PTR_ERR(cs);
1036 goto err_rq;
1037 }
1038
1039 *cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
1040 *cs++ = MI_BATCH_BUFFER_START_GEN8 | BIT(8);
1041 *cs++ = lower_32_bits(b_before->node.start);
1042 *cs++ = upper_32_bits(b_before->node.start);
1043
1044 *cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
1045 *cs++ = MI_SEMAPHORE_WAIT |
1046 MI_SEMAPHORE_GLOBAL_GTT |
1047 MI_SEMAPHORE_POLL |
1048 MI_SEMAPHORE_SAD_NEQ_SDD;
1049 *cs++ = 0;
1050 *cs++ = i915_ggtt_offset(ce->engine->status_page.vma) +
1051 offset_in_page(sema);
1052 *cs++ = 0;
1053 *cs++ = MI_NOOP;
1054
1055 *cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
1056 *cs++ = MI_BATCH_BUFFER_START_GEN8 | BIT(8);
1057 *cs++ = lower_32_bits(b_after->node.start);
1058 *cs++ = upper_32_bits(b_after->node.start);
1059
1060 intel_ring_advance(rq, cs);
1061
1062 WRITE_ONCE(*sema, 0);
1063 i915_request_get(rq);
1064 i915_request_add(rq);
1065 err_after:
1066 i915_vma_put(b_after);
1067 err_before:
1068 i915_vma_put(b_before);
1069 return rq;
1070
1071 err_rq:
1072 i915_request_add(rq);
1073 rq = ERR_PTR(err);
1074 goto err_after;
1075 }
1076
load_context(struct intel_context * ce,u32 poison)1077 static struct i915_vma *load_context(struct intel_context *ce, u32 poison)
1078 {
1079 struct i915_vma *batch;
1080 u32 dw, *cs, *hw;
1081 u32 *defaults;
1082
1083 batch = create_user_vma(ce->vm, SZ_64K);
1084 if (IS_ERR(batch))
1085 return batch;
1086
1087 cs = i915_gem_object_pin_map_unlocked(batch->obj, I915_MAP_WC);
1088 if (IS_ERR(cs)) {
1089 i915_vma_put(batch);
1090 return ERR_CAST(cs);
1091 }
1092
1093 defaults = shmem_pin_map(ce->engine->default_state);
1094 if (!defaults) {
1095 i915_gem_object_unpin_map(batch->obj);
1096 i915_vma_put(batch);
1097 return ERR_PTR(-ENOMEM);
1098 }
1099
1100 dw = 0;
1101 hw = defaults;
1102 hw += LRC_STATE_OFFSET / sizeof(*hw);
1103 do {
1104 u32 len = hw[dw] & 0x7f;
1105
1106 if (hw[dw] == 0) {
1107 dw++;
1108 continue;
1109 }
1110
1111 if ((hw[dw] & GENMASK(31, 23)) != MI_INSTR(0x22, 0)) {
1112 dw += len + 2;
1113 continue;
1114 }
1115
1116 dw++;
1117 len = (len + 1) / 2;
1118 *cs++ = MI_LOAD_REGISTER_IMM(len);
1119 while (len--) {
1120 *cs++ = hw[dw];
1121 *cs++ = poison;
1122 dw += 2;
1123 }
1124 } while (dw < PAGE_SIZE / sizeof(u32) &&
1125 (hw[dw] & ~BIT(0)) != MI_BATCH_BUFFER_END);
1126
1127 *cs++ = MI_BATCH_BUFFER_END;
1128
1129 shmem_unpin_map(ce->engine->default_state, defaults);
1130
1131 i915_gem_object_flush_map(batch->obj);
1132 i915_gem_object_unpin_map(batch->obj);
1133
1134 return batch;
1135 }
1136
poison_registers(struct intel_context * ce,u32 poison,u32 * sema)1137 static int poison_registers(struct intel_context *ce, u32 poison, u32 *sema)
1138 {
1139 struct i915_request *rq;
1140 struct i915_vma *batch;
1141 u32 *cs;
1142 int err;
1143
1144 batch = load_context(ce, poison);
1145 if (IS_ERR(batch))
1146 return PTR_ERR(batch);
1147
1148 rq = intel_context_create_request(ce);
1149 if (IS_ERR(rq)) {
1150 err = PTR_ERR(rq);
1151 goto err_batch;
1152 }
1153
1154 err = move_to_active(rq, batch, 0);
1155 if (err)
1156 goto err_rq;
1157
1158 cs = intel_ring_begin(rq, 8);
1159 if (IS_ERR(cs)) {
1160 err = PTR_ERR(cs);
1161 goto err_rq;
1162 }
1163
1164 *cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
1165 *cs++ = MI_BATCH_BUFFER_START_GEN8 | BIT(8);
1166 *cs++ = lower_32_bits(batch->node.start);
1167 *cs++ = upper_32_bits(batch->node.start);
1168
1169 *cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
1170 *cs++ = i915_ggtt_offset(ce->engine->status_page.vma) +
1171 offset_in_page(sema);
1172 *cs++ = 0;
1173 *cs++ = 1;
1174
1175 intel_ring_advance(rq, cs);
1176
1177 rq->sched.attr.priority = I915_PRIORITY_BARRIER;
1178 err_rq:
1179 i915_request_add(rq);
1180 err_batch:
1181 i915_vma_put(batch);
1182 return err;
1183 }
1184
is_moving(u32 a,u32 b)1185 static bool is_moving(u32 a, u32 b)
1186 {
1187 return a != b;
1188 }
1189
compare_isolation(struct intel_engine_cs * engine,struct i915_vma * ref[2],struct i915_vma * result[2],struct intel_context * ce,u32 poison)1190 static int compare_isolation(struct intel_engine_cs *engine,
1191 struct i915_vma *ref[2],
1192 struct i915_vma *result[2],
1193 struct intel_context *ce,
1194 u32 poison)
1195 {
1196 u32 x, dw, *hw, *lrc;
1197 u32 *A[2], *B[2];
1198 u32 *defaults;
1199 int err = 0;
1200
1201 A[0] = i915_gem_object_pin_map_unlocked(ref[0]->obj, I915_MAP_WC);
1202 if (IS_ERR(A[0]))
1203 return PTR_ERR(A[0]);
1204
1205 A[1] = i915_gem_object_pin_map_unlocked(ref[1]->obj, I915_MAP_WC);
1206 if (IS_ERR(A[1])) {
1207 err = PTR_ERR(A[1]);
1208 goto err_A0;
1209 }
1210
1211 B[0] = i915_gem_object_pin_map_unlocked(result[0]->obj, I915_MAP_WC);
1212 if (IS_ERR(B[0])) {
1213 err = PTR_ERR(B[0]);
1214 goto err_A1;
1215 }
1216
1217 B[1] = i915_gem_object_pin_map_unlocked(result[1]->obj, I915_MAP_WC);
1218 if (IS_ERR(B[1])) {
1219 err = PTR_ERR(B[1]);
1220 goto err_B0;
1221 }
1222
1223 lrc = i915_gem_object_pin_map_unlocked(ce->state->obj,
1224 i915_coherent_map_type(engine->i915,
1225 ce->state->obj,
1226 false));
1227 if (IS_ERR(lrc)) {
1228 err = PTR_ERR(lrc);
1229 goto err_B1;
1230 }
1231 lrc += LRC_STATE_OFFSET / sizeof(*hw);
1232
1233 defaults = shmem_pin_map(ce->engine->default_state);
1234 if (!defaults) {
1235 err = -ENOMEM;
1236 goto err_lrc;
1237 }
1238
1239 x = 0;
1240 dw = 0;
1241 hw = defaults;
1242 hw += LRC_STATE_OFFSET / sizeof(*hw);
1243 do {
1244 u32 len = hw[dw] & 0x7f;
1245
1246 if (hw[dw] == 0) {
1247 dw++;
1248 continue;
1249 }
1250
1251 if ((hw[dw] & GENMASK(31, 23)) != MI_INSTR(0x22, 0)) {
1252 dw += len + 2;
1253 continue;
1254 }
1255
1256 dw++;
1257 len = (len + 1) / 2;
1258 while (len--) {
1259 if (!is_moving(A[0][x], A[1][x]) &&
1260 (A[0][x] != B[0][x] || A[1][x] != B[1][x])) {
1261 switch (hw[dw] & 4095) {
1262 case 0x30: /* RING_HEAD */
1263 case 0x34: /* RING_TAIL */
1264 break;
1265
1266 default:
1267 pr_err("%s[%d]: Mismatch for register %4x, default %08x, reference %08x, result (%08x, %08x), poison %08x, context %08x\n",
1268 engine->name, dw,
1269 hw[dw], hw[dw + 1],
1270 A[0][x], B[0][x], B[1][x],
1271 poison, lrc[dw + 1]);
1272 err = -EINVAL;
1273 }
1274 }
1275 dw += 2;
1276 x++;
1277 }
1278 } while (dw < PAGE_SIZE / sizeof(u32) &&
1279 (hw[dw] & ~BIT(0)) != MI_BATCH_BUFFER_END);
1280
1281 shmem_unpin_map(ce->engine->default_state, defaults);
1282 err_lrc:
1283 i915_gem_object_unpin_map(ce->state->obj);
1284 err_B1:
1285 i915_gem_object_unpin_map(result[1]->obj);
1286 err_B0:
1287 i915_gem_object_unpin_map(result[0]->obj);
1288 err_A1:
1289 i915_gem_object_unpin_map(ref[1]->obj);
1290 err_A0:
1291 i915_gem_object_unpin_map(ref[0]->obj);
1292 return err;
1293 }
1294
__lrc_isolation(struct intel_engine_cs * engine,u32 poison)1295 static int __lrc_isolation(struct intel_engine_cs *engine, u32 poison)
1296 {
1297 u32 *sema = memset32(engine->status_page.addr + 1000, 0, 1);
1298 struct i915_vma *ref[2], *result[2];
1299 struct intel_context *A, *B;
1300 struct i915_request *rq;
1301 int err;
1302
1303 A = intel_context_create(engine);
1304 if (IS_ERR(A))
1305 return PTR_ERR(A);
1306
1307 B = intel_context_create(engine);
1308 if (IS_ERR(B)) {
1309 err = PTR_ERR(B);
1310 goto err_A;
1311 }
1312
1313 ref[0] = create_user_vma(A->vm, SZ_64K);
1314 if (IS_ERR(ref[0])) {
1315 err = PTR_ERR(ref[0]);
1316 goto err_B;
1317 }
1318
1319 ref[1] = create_user_vma(A->vm, SZ_64K);
1320 if (IS_ERR(ref[1])) {
1321 err = PTR_ERR(ref[1]);
1322 goto err_ref0;
1323 }
1324
1325 rq = record_registers(A, ref[0], ref[1], sema);
1326 if (IS_ERR(rq)) {
1327 err = PTR_ERR(rq);
1328 goto err_ref1;
1329 }
1330
1331 WRITE_ONCE(*sema, 1);
1332 wmb();
1333
1334 if (i915_request_wait(rq, 0, HZ / 2) < 0) {
1335 i915_request_put(rq);
1336 err = -ETIME;
1337 goto err_ref1;
1338 }
1339 i915_request_put(rq);
1340
1341 result[0] = create_user_vma(A->vm, SZ_64K);
1342 if (IS_ERR(result[0])) {
1343 err = PTR_ERR(result[0]);
1344 goto err_ref1;
1345 }
1346
1347 result[1] = create_user_vma(A->vm, SZ_64K);
1348 if (IS_ERR(result[1])) {
1349 err = PTR_ERR(result[1]);
1350 goto err_result0;
1351 }
1352
1353 rq = record_registers(A, result[0], result[1], sema);
1354 if (IS_ERR(rq)) {
1355 err = PTR_ERR(rq);
1356 goto err_result1;
1357 }
1358
1359 err = poison_registers(B, poison, sema);
1360 if (err) {
1361 WRITE_ONCE(*sema, -1);
1362 i915_request_put(rq);
1363 goto err_result1;
1364 }
1365
1366 if (i915_request_wait(rq, 0, HZ / 2) < 0) {
1367 i915_request_put(rq);
1368 err = -ETIME;
1369 goto err_result1;
1370 }
1371 i915_request_put(rq);
1372
1373 err = compare_isolation(engine, ref, result, A, poison);
1374
1375 err_result1:
1376 i915_vma_put(result[1]);
1377 err_result0:
1378 i915_vma_put(result[0]);
1379 err_ref1:
1380 i915_vma_put(ref[1]);
1381 err_ref0:
1382 i915_vma_put(ref[0]);
1383 err_B:
1384 intel_context_put(B);
1385 err_A:
1386 intel_context_put(A);
1387 return err;
1388 }
1389
skip_isolation(const struct intel_engine_cs * engine)1390 static bool skip_isolation(const struct intel_engine_cs *engine)
1391 {
1392 if (engine->class == COPY_ENGINE_CLASS && GRAPHICS_VER(engine->i915) == 9)
1393 return true;
1394
1395 if (engine->class == RENDER_CLASS && GRAPHICS_VER(engine->i915) == 11)
1396 return true;
1397
1398 return false;
1399 }
1400
live_lrc_isolation(void * arg)1401 static int live_lrc_isolation(void *arg)
1402 {
1403 struct intel_gt *gt = arg;
1404 struct intel_engine_cs *engine;
1405 enum intel_engine_id id;
1406 const u32 poison[] = {
1407 STACK_MAGIC,
1408 0x3a3a3a3a,
1409 0x5c5c5c5c,
1410 0xffffffff,
1411 0xffff0000,
1412 };
1413 int err = 0;
1414
1415 /*
1416 * Our goal is try and verify that per-context state cannot be
1417 * tampered with by another non-privileged client.
1418 *
1419 * We take the list of context registers from the LRI in the default
1420 * context image and attempt to modify that list from a remote context.
1421 */
1422
1423 for_each_engine(engine, gt, id) {
1424 int i;
1425
1426 /* Just don't even ask */
1427 if (!IS_ENABLED(CONFIG_DRM_I915_SELFTEST_BROKEN) &&
1428 skip_isolation(engine))
1429 continue;
1430
1431 intel_engine_pm_get(engine);
1432 for (i = 0; i < ARRAY_SIZE(poison); i++) {
1433 int result;
1434
1435 result = __lrc_isolation(engine, poison[i]);
1436 if (result && !err)
1437 err = result;
1438
1439 result = __lrc_isolation(engine, ~poison[i]);
1440 if (result && !err)
1441 err = result;
1442 }
1443 intel_engine_pm_put(engine);
1444 if (igt_flush_test(gt->i915)) {
1445 err = -EIO;
1446 break;
1447 }
1448 }
1449
1450 return err;
1451 }
1452
indirect_ctx_submit_req(struct intel_context * ce)1453 static int indirect_ctx_submit_req(struct intel_context *ce)
1454 {
1455 struct i915_request *rq;
1456 int err = 0;
1457
1458 rq = intel_context_create_request(ce);
1459 if (IS_ERR(rq))
1460 return PTR_ERR(rq);
1461
1462 i915_request_get(rq);
1463 i915_request_add(rq);
1464
1465 if (i915_request_wait(rq, 0, HZ / 5) < 0)
1466 err = -ETIME;
1467
1468 i915_request_put(rq);
1469
1470 return err;
1471 }
1472
1473 #define CTX_BB_CANARY_OFFSET (3 * 1024)
1474 #define CTX_BB_CANARY_INDEX (CTX_BB_CANARY_OFFSET / sizeof(u32))
1475
1476 static u32 *
emit_indirect_ctx_bb_canary(const struct intel_context * ce,u32 * cs)1477 emit_indirect_ctx_bb_canary(const struct intel_context *ce, u32 *cs)
1478 {
1479 *cs++ = MI_STORE_REGISTER_MEM_GEN8 |
1480 MI_SRM_LRM_GLOBAL_GTT |
1481 MI_LRI_LRM_CS_MMIO;
1482 *cs++ = i915_mmio_reg_offset(RING_START(0));
1483 *cs++ = i915_ggtt_offset(ce->state) +
1484 context_wa_bb_offset(ce) +
1485 CTX_BB_CANARY_OFFSET;
1486 *cs++ = 0;
1487
1488 return cs;
1489 }
1490
1491 static void
indirect_ctx_bb_setup(struct intel_context * ce)1492 indirect_ctx_bb_setup(struct intel_context *ce)
1493 {
1494 u32 *cs = context_indirect_bb(ce);
1495
1496 cs[CTX_BB_CANARY_INDEX] = 0xdeadf00d;
1497
1498 setup_indirect_ctx_bb(ce, ce->engine, emit_indirect_ctx_bb_canary);
1499 }
1500
check_ring_start(struct intel_context * ce)1501 static bool check_ring_start(struct intel_context *ce)
1502 {
1503 const u32 * const ctx_bb = (void *)(ce->lrc_reg_state) -
1504 LRC_STATE_OFFSET + context_wa_bb_offset(ce);
1505
1506 if (ctx_bb[CTX_BB_CANARY_INDEX] == ce->lrc_reg_state[CTX_RING_START])
1507 return true;
1508
1509 pr_err("ring start mismatch: canary 0x%08x vs state 0x%08x\n",
1510 ctx_bb[CTX_BB_CANARY_INDEX],
1511 ce->lrc_reg_state[CTX_RING_START]);
1512
1513 return false;
1514 }
1515
indirect_ctx_bb_check(struct intel_context * ce)1516 static int indirect_ctx_bb_check(struct intel_context *ce)
1517 {
1518 int err;
1519
1520 err = indirect_ctx_submit_req(ce);
1521 if (err)
1522 return err;
1523
1524 if (!check_ring_start(ce))
1525 return -EINVAL;
1526
1527 return 0;
1528 }
1529
__live_lrc_indirect_ctx_bb(struct intel_engine_cs * engine)1530 static int __live_lrc_indirect_ctx_bb(struct intel_engine_cs *engine)
1531 {
1532 struct intel_context *a, *b;
1533 int err;
1534
1535 a = intel_context_create(engine);
1536 if (IS_ERR(a))
1537 return PTR_ERR(a);
1538 err = intel_context_pin(a);
1539 if (err)
1540 goto put_a;
1541
1542 b = intel_context_create(engine);
1543 if (IS_ERR(b)) {
1544 err = PTR_ERR(b);
1545 goto unpin_a;
1546 }
1547 err = intel_context_pin(b);
1548 if (err)
1549 goto put_b;
1550
1551 /* We use the already reserved extra page in context state */
1552 if (!a->wa_bb_page) {
1553 GEM_BUG_ON(b->wa_bb_page);
1554 GEM_BUG_ON(GRAPHICS_VER(engine->i915) == 12);
1555 goto unpin_b;
1556 }
1557
1558 /*
1559 * In order to test that our per context bb is truly per context,
1560 * and executes at the intended spot on context restoring process,
1561 * make the batch store the ring start value to memory.
1562 * As ring start is restored apriori of starting the indirect ctx bb and
1563 * as it will be different for each context, it fits to this purpose.
1564 */
1565 indirect_ctx_bb_setup(a);
1566 indirect_ctx_bb_setup(b);
1567
1568 err = indirect_ctx_bb_check(a);
1569 if (err)
1570 goto unpin_b;
1571
1572 err = indirect_ctx_bb_check(b);
1573
1574 unpin_b:
1575 intel_context_unpin(b);
1576 put_b:
1577 intel_context_put(b);
1578 unpin_a:
1579 intel_context_unpin(a);
1580 put_a:
1581 intel_context_put(a);
1582
1583 return err;
1584 }
1585
live_lrc_indirect_ctx_bb(void * arg)1586 static int live_lrc_indirect_ctx_bb(void *arg)
1587 {
1588 struct intel_gt *gt = arg;
1589 struct intel_engine_cs *engine;
1590 enum intel_engine_id id;
1591 int err = 0;
1592
1593 for_each_engine(engine, gt, id) {
1594 intel_engine_pm_get(engine);
1595 err = __live_lrc_indirect_ctx_bb(engine);
1596 intel_engine_pm_put(engine);
1597
1598 if (igt_flush_test(gt->i915))
1599 err = -EIO;
1600
1601 if (err)
1602 break;
1603 }
1604
1605 return err;
1606 }
1607
garbage_reset(struct intel_engine_cs * engine,struct i915_request * rq)1608 static void garbage_reset(struct intel_engine_cs *engine,
1609 struct i915_request *rq)
1610 {
1611 const unsigned int bit = I915_RESET_ENGINE + engine->id;
1612 unsigned long *lock = &engine->gt->reset.flags;
1613
1614 local_bh_disable();
1615 if (!test_and_set_bit(bit, lock)) {
1616 tasklet_disable(&engine->sched_engine->tasklet);
1617
1618 if (!rq->fence.error)
1619 __intel_engine_reset_bh(engine, NULL);
1620
1621 tasklet_enable(&engine->sched_engine->tasklet);
1622 clear_and_wake_up_bit(bit, lock);
1623 }
1624 local_bh_enable();
1625 }
1626
garbage(struct intel_context * ce,struct rnd_state * prng)1627 static struct i915_request *garbage(struct intel_context *ce,
1628 struct rnd_state *prng)
1629 {
1630 struct i915_request *rq;
1631 int err;
1632
1633 err = intel_context_pin(ce);
1634 if (err)
1635 return ERR_PTR(err);
1636
1637 prandom_bytes_state(prng,
1638 ce->lrc_reg_state,
1639 ce->engine->context_size -
1640 LRC_STATE_OFFSET);
1641
1642 rq = intel_context_create_request(ce);
1643 if (IS_ERR(rq)) {
1644 err = PTR_ERR(rq);
1645 goto err_unpin;
1646 }
1647
1648 i915_request_get(rq);
1649 i915_request_add(rq);
1650 return rq;
1651
1652 err_unpin:
1653 intel_context_unpin(ce);
1654 return ERR_PTR(err);
1655 }
1656
__lrc_garbage(struct intel_engine_cs * engine,struct rnd_state * prng)1657 static int __lrc_garbage(struct intel_engine_cs *engine, struct rnd_state *prng)
1658 {
1659 struct intel_context *ce;
1660 struct i915_request *hang;
1661 int err = 0;
1662
1663 ce = intel_context_create(engine);
1664 if (IS_ERR(ce))
1665 return PTR_ERR(ce);
1666
1667 hang = garbage(ce, prng);
1668 if (IS_ERR(hang)) {
1669 err = PTR_ERR(hang);
1670 goto err_ce;
1671 }
1672
1673 if (wait_for_submit(engine, hang, HZ / 2)) {
1674 i915_request_put(hang);
1675 err = -ETIME;
1676 goto err_ce;
1677 }
1678
1679 intel_context_set_banned(ce);
1680 garbage_reset(engine, hang);
1681
1682 intel_engine_flush_submission(engine);
1683 if (!hang->fence.error) {
1684 i915_request_put(hang);
1685 pr_err("%s: corrupted context was not reset\n",
1686 engine->name);
1687 err = -EINVAL;
1688 goto err_ce;
1689 }
1690
1691 if (i915_request_wait(hang, 0, HZ / 2) < 0) {
1692 pr_err("%s: corrupted context did not recover\n",
1693 engine->name);
1694 i915_request_put(hang);
1695 err = -EIO;
1696 goto err_ce;
1697 }
1698 i915_request_put(hang);
1699
1700 err_ce:
1701 intel_context_put(ce);
1702 return err;
1703 }
1704
live_lrc_garbage(void * arg)1705 static int live_lrc_garbage(void *arg)
1706 {
1707 struct intel_gt *gt = arg;
1708 struct intel_engine_cs *engine;
1709 enum intel_engine_id id;
1710
1711 /*
1712 * Verify that we can recover if one context state is completely
1713 * corrupted.
1714 */
1715
1716 if (!IS_ENABLED(CONFIG_DRM_I915_SELFTEST_BROKEN))
1717 return 0;
1718
1719 for_each_engine(engine, gt, id) {
1720 I915_RND_STATE(prng);
1721 int err = 0, i;
1722
1723 if (!intel_has_reset_engine(engine->gt))
1724 continue;
1725
1726 intel_engine_pm_get(engine);
1727 for (i = 0; i < 3; i++) {
1728 err = __lrc_garbage(engine, &prng);
1729 if (err)
1730 break;
1731 }
1732 intel_engine_pm_put(engine);
1733
1734 if (igt_flush_test(gt->i915))
1735 err = -EIO;
1736 if (err)
1737 return err;
1738 }
1739
1740 return 0;
1741 }
1742
__live_pphwsp_runtime(struct intel_engine_cs * engine)1743 static int __live_pphwsp_runtime(struct intel_engine_cs *engine)
1744 {
1745 struct intel_context *ce;
1746 struct i915_request *rq;
1747 IGT_TIMEOUT(end_time);
1748 int err;
1749
1750 ce = intel_context_create(engine);
1751 if (IS_ERR(ce))
1752 return PTR_ERR(ce);
1753
1754 ce->runtime.num_underflow = 0;
1755 ce->runtime.max_underflow = 0;
1756
1757 do {
1758 unsigned int loop = 1024;
1759
1760 while (loop) {
1761 rq = intel_context_create_request(ce);
1762 if (IS_ERR(rq)) {
1763 err = PTR_ERR(rq);
1764 goto err_rq;
1765 }
1766
1767 if (--loop == 0)
1768 i915_request_get(rq);
1769
1770 i915_request_add(rq);
1771 }
1772
1773 if (__igt_timeout(end_time, NULL))
1774 break;
1775
1776 i915_request_put(rq);
1777 } while (1);
1778
1779 err = i915_request_wait(rq, 0, HZ / 5);
1780 if (err < 0) {
1781 pr_err("%s: request not completed!\n", engine->name);
1782 goto err_wait;
1783 }
1784
1785 igt_flush_test(engine->i915);
1786
1787 pr_info("%s: pphwsp runtime %lluns, average %lluns\n",
1788 engine->name,
1789 intel_context_get_total_runtime_ns(ce),
1790 intel_context_get_avg_runtime_ns(ce));
1791
1792 err = 0;
1793 if (ce->runtime.num_underflow) {
1794 pr_err("%s: pphwsp underflow %u time(s), max %u cycles!\n",
1795 engine->name,
1796 ce->runtime.num_underflow,
1797 ce->runtime.max_underflow);
1798 GEM_TRACE_DUMP();
1799 err = -EOVERFLOW;
1800 }
1801
1802 err_wait:
1803 i915_request_put(rq);
1804 err_rq:
1805 intel_context_put(ce);
1806 return err;
1807 }
1808
live_pphwsp_runtime(void * arg)1809 static int live_pphwsp_runtime(void *arg)
1810 {
1811 struct intel_gt *gt = arg;
1812 struct intel_engine_cs *engine;
1813 enum intel_engine_id id;
1814 int err = 0;
1815
1816 /*
1817 * Check that cumulative context runtime as stored in the pphwsp[16]
1818 * is monotonic.
1819 */
1820
1821 for_each_engine(engine, gt, id) {
1822 err = __live_pphwsp_runtime(engine);
1823 if (err)
1824 break;
1825 }
1826
1827 if (igt_flush_test(gt->i915))
1828 err = -EIO;
1829
1830 return err;
1831 }
1832
intel_lrc_live_selftests(struct drm_i915_private * i915)1833 int intel_lrc_live_selftests(struct drm_i915_private *i915)
1834 {
1835 static const struct i915_subtest tests[] = {
1836 SUBTEST(live_lrc_layout),
1837 SUBTEST(live_lrc_fixed),
1838 SUBTEST(live_lrc_state),
1839 SUBTEST(live_lrc_gpr),
1840 SUBTEST(live_lrc_isolation),
1841 SUBTEST(live_lrc_timestamp),
1842 SUBTEST(live_lrc_garbage),
1843 SUBTEST(live_pphwsp_runtime),
1844 SUBTEST(live_lrc_indirect_ctx_bb),
1845 };
1846
1847 if (!HAS_LOGICAL_RING_CONTEXTS(i915))
1848 return 0;
1849
1850 return intel_gt_live_subtests(tests, &i915->gt);
1851 }
1852
