1 /*
2  * Copyright (c) 2008 Intel Corporation
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21  * IN THE SOFTWARE.
22  *
23  * Authors:
24  *    Eric Anholt <eric@anholt.net>
25  *    Keith Packard <keithp@keithp.com>
26  *    Mika Kuoppala <mika.kuoppala@intel.com>
27  *
28  */
29 
30 #include <linux/ascii85.h>
31 #include <linux/nmi.h>
32 #include <linux/pagevec.h>
33 #include <linux/scatterlist.h>
34 #include <linux/utsname.h>
35 #include <linux/zlib.h>
36 
37 #include <drm/drm_print.h>
38 
39 #include "display/intel_atomic.h"
40 #include "display/intel_csr.h"
41 #include "display/intel_overlay.h"
42 
43 #include "gem/i915_gem_context.h"
44 #include "gem/i915_gem_lmem.h"
45 #include "gt/intel_gt.h"
46 #include "gt/intel_gt_pm.h"
47 
48 #include "i915_drv.h"
49 #include "i915_gpu_error.h"
50 #include "i915_memcpy.h"
51 #include "i915_scatterlist.h"
52 
53 #define ALLOW_FAIL (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
54 #define ATOMIC_MAYFAIL (GFP_ATOMIC | __GFP_NOWARN)
55 
56 static void __sg_set_buf(struct scatterlist *sg,
57 			 void *addr, unsigned int len, loff_t it)
58 {
59 	sg->page_link = (unsigned long)virt_to_page(addr);
60 	sg->offset = offset_in_page(addr);
61 	sg->length = len;
62 	sg->dma_address = it;
63 }
64 
65 static bool __i915_error_grow(struct drm_i915_error_state_buf *e, size_t len)
66 {
67 	if (!len)
68 		return false;
69 
70 	if (e->bytes + len + 1 <= e->size)
71 		return true;
72 
73 	if (e->bytes) {
74 		__sg_set_buf(e->cur++, e->buf, e->bytes, e->iter);
75 		e->iter += e->bytes;
76 		e->buf = NULL;
77 		e->bytes = 0;
78 	}
79 
80 	if (e->cur == e->end) {
81 		struct scatterlist *sgl;
82 
83 		sgl = (typeof(sgl))__get_free_page(ALLOW_FAIL);
84 		if (!sgl) {
85 			e->err = -ENOMEM;
86 			return false;
87 		}
88 
89 		if (e->cur) {
90 			e->cur->offset = 0;
91 			e->cur->length = 0;
92 			e->cur->page_link =
93 				(unsigned long)sgl | SG_CHAIN;
94 		} else {
95 			e->sgl = sgl;
96 		}
97 
98 		e->cur = sgl;
99 		e->end = sgl + SG_MAX_SINGLE_ALLOC - 1;
100 	}
101 
102 	e->size = ALIGN(len + 1, SZ_64K);
103 	e->buf = kmalloc(e->size, ALLOW_FAIL);
104 	if (!e->buf) {
105 		e->size = PAGE_ALIGN(len + 1);
106 		e->buf = kmalloc(e->size, GFP_KERNEL);
107 	}
108 	if (!e->buf) {
109 		e->err = -ENOMEM;
110 		return false;
111 	}
112 
113 	return true;
114 }
115 
116 __printf(2, 0)
117 static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
118 			       const char *fmt, va_list args)
119 {
120 	va_list ap;
121 	int len;
122 
123 	if (e->err)
124 		return;
125 
126 	va_copy(ap, args);
127 	len = vsnprintf(NULL, 0, fmt, ap);
128 	va_end(ap);
129 	if (len <= 0) {
130 		e->err = len;
131 		return;
132 	}
133 
134 	if (!__i915_error_grow(e, len))
135 		return;
136 
137 	GEM_BUG_ON(e->bytes >= e->size);
138 	len = vscnprintf(e->buf + e->bytes, e->size - e->bytes, fmt, args);
139 	if (len < 0) {
140 		e->err = len;
141 		return;
142 	}
143 	e->bytes += len;
144 }
145 
146 static void i915_error_puts(struct drm_i915_error_state_buf *e, const char *str)
147 {
148 	unsigned len;
149 
150 	if (e->err || !str)
151 		return;
152 
153 	len = strlen(str);
154 	if (!__i915_error_grow(e, len))
155 		return;
156 
157 	GEM_BUG_ON(e->bytes + len > e->size);
158 	memcpy(e->buf + e->bytes, str, len);
159 	e->bytes += len;
160 }
161 
162 #define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
163 #define err_puts(e, s) i915_error_puts(e, s)
164 
165 static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
166 {
167 	i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
168 }
169 
170 static inline struct drm_printer
171 i915_error_printer(struct drm_i915_error_state_buf *e)
172 {
173 	struct drm_printer p = {
174 		.printfn = __i915_printfn_error,
175 		.arg = e,
176 	};
177 	return p;
178 }
179 
180 /* single threaded page allocator with a reserved stash for emergencies */
181 static void pool_fini(struct pagevec *pv)
182 {
183 	pagevec_release(pv);
184 }
185 
186 static int pool_refill(struct pagevec *pv, gfp_t gfp)
187 {
188 	while (pagevec_space(pv)) {
189 		struct page *p;
190 
191 		p = alloc_page(gfp);
192 		if (!p)
193 			return -ENOMEM;
194 
195 		pagevec_add(pv, p);
196 	}
197 
198 	return 0;
199 }
200 
201 static int pool_init(struct pagevec *pv, gfp_t gfp)
202 {
203 	int err;
204 
205 	pagevec_init(pv);
206 
207 	err = pool_refill(pv, gfp);
208 	if (err)
209 		pool_fini(pv);
210 
211 	return err;
212 }
213 
214 static void *pool_alloc(struct pagevec *pv, gfp_t gfp)
215 {
216 	struct page *p;
217 
218 	p = alloc_page(gfp);
219 	if (!p && pagevec_count(pv))
220 		p = pv->pages[--pv->nr];
221 
222 	return p ? page_address(p) : NULL;
223 }
224 
225 static void pool_free(struct pagevec *pv, void *addr)
226 {
227 	struct page *p = virt_to_page(addr);
228 
229 	if (pagevec_space(pv))
230 		pagevec_add(pv, p);
231 	else
232 		__free_page(p);
233 }
234 
235 #ifdef CONFIG_DRM_I915_COMPRESS_ERROR
236 
237 struct i915_vma_compress {
238 	struct pagevec pool;
239 	struct z_stream_s zstream;
240 	void *tmp;
241 };
242 
243 static bool compress_init(struct i915_vma_compress *c)
244 {
245 	struct z_stream_s *zstream = &c->zstream;
246 
247 	if (pool_init(&c->pool, ALLOW_FAIL))
248 		return false;
249 
250 	zstream->workspace =
251 		kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
252 			ALLOW_FAIL);
253 	if (!zstream->workspace) {
254 		pool_fini(&c->pool);
255 		return false;
256 	}
257 
258 	c->tmp = NULL;
259 	if (i915_has_memcpy_from_wc())
260 		c->tmp = pool_alloc(&c->pool, ALLOW_FAIL);
261 
262 	return true;
263 }
264 
265 static bool compress_start(struct i915_vma_compress *c)
266 {
267 	struct z_stream_s *zstream = &c->zstream;
268 	void *workspace = zstream->workspace;
269 
270 	memset(zstream, 0, sizeof(*zstream));
271 	zstream->workspace = workspace;
272 
273 	return zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) == Z_OK;
274 }
275 
276 static void *compress_next_page(struct i915_vma_compress *c,
277 				struct i915_vma_coredump *dst)
278 {
279 	void *page;
280 
281 	if (dst->page_count >= dst->num_pages)
282 		return ERR_PTR(-ENOSPC);
283 
284 	page = pool_alloc(&c->pool, ALLOW_FAIL);
285 	if (!page)
286 		return ERR_PTR(-ENOMEM);
287 
288 	return dst->pages[dst->page_count++] = page;
289 }
290 
291 static int compress_page(struct i915_vma_compress *c,
292 			 void *src,
293 			 struct i915_vma_coredump *dst,
294 			 bool wc)
295 {
296 	struct z_stream_s *zstream = &c->zstream;
297 
298 	zstream->next_in = src;
299 	if (wc && c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
300 		zstream->next_in = c->tmp;
301 	zstream->avail_in = PAGE_SIZE;
302 
303 	do {
304 		if (zstream->avail_out == 0) {
305 			zstream->next_out = compress_next_page(c, dst);
306 			if (IS_ERR(zstream->next_out))
307 				return PTR_ERR(zstream->next_out);
308 
309 			zstream->avail_out = PAGE_SIZE;
310 		}
311 
312 		if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
313 			return -EIO;
314 
315 		cond_resched();
316 	} while (zstream->avail_in);
317 
318 	/* Fallback to uncompressed if we increase size? */
319 	if (0 && zstream->total_out > zstream->total_in)
320 		return -E2BIG;
321 
322 	return 0;
323 }
324 
325 static int compress_flush(struct i915_vma_compress *c,
326 			  struct i915_vma_coredump *dst)
327 {
328 	struct z_stream_s *zstream = &c->zstream;
329 
330 	do {
331 		switch (zlib_deflate(zstream, Z_FINISH)) {
332 		case Z_OK: /* more space requested */
333 			zstream->next_out = compress_next_page(c, dst);
334 			if (IS_ERR(zstream->next_out))
335 				return PTR_ERR(zstream->next_out);
336 
337 			zstream->avail_out = PAGE_SIZE;
338 			break;
339 
340 		case Z_STREAM_END:
341 			goto end;
342 
343 		default: /* any error */
344 			return -EIO;
345 		}
346 	} while (1);
347 
348 end:
349 	memset(zstream->next_out, 0, zstream->avail_out);
350 	dst->unused = zstream->avail_out;
351 	return 0;
352 }
353 
354 static void compress_finish(struct i915_vma_compress *c)
355 {
356 	zlib_deflateEnd(&c->zstream);
357 }
358 
359 static void compress_fini(struct i915_vma_compress *c)
360 {
361 	kfree(c->zstream.workspace);
362 	if (c->tmp)
363 		pool_free(&c->pool, c->tmp);
364 	pool_fini(&c->pool);
365 }
366 
367 static void err_compression_marker(struct drm_i915_error_state_buf *m)
368 {
369 	err_puts(m, ":");
370 }
371 
372 #else
373 
374 struct i915_vma_compress {
375 	struct pagevec pool;
376 };
377 
378 static bool compress_init(struct i915_vma_compress *c)
379 {
380 	return pool_init(&c->pool, ALLOW_FAIL) == 0;
381 }
382 
383 static bool compress_start(struct i915_vma_compress *c)
384 {
385 	return true;
386 }
387 
388 static int compress_page(struct i915_vma_compress *c,
389 			 void *src,
390 			 struct i915_vma_coredump *dst,
391 			 bool wc)
392 {
393 	void *ptr;
394 
395 	ptr = pool_alloc(&c->pool, ALLOW_FAIL);
396 	if (!ptr)
397 		return -ENOMEM;
398 
399 	if (!(wc && i915_memcpy_from_wc(ptr, src, PAGE_SIZE)))
400 		memcpy(ptr, src, PAGE_SIZE);
401 	dst->pages[dst->page_count++] = ptr;
402 	cond_resched();
403 
404 	return 0;
405 }
406 
407 static int compress_flush(struct i915_vma_compress *c,
408 			  struct i915_vma_coredump *dst)
409 {
410 	return 0;
411 }
412 
413 static void compress_finish(struct i915_vma_compress *c)
414 {
415 }
416 
417 static void compress_fini(struct i915_vma_compress *c)
418 {
419 	pool_fini(&c->pool);
420 }
421 
422 static void err_compression_marker(struct drm_i915_error_state_buf *m)
423 {
424 	err_puts(m, "~");
425 }
426 
427 #endif
428 
429 static void error_print_instdone(struct drm_i915_error_state_buf *m,
430 				 const struct intel_engine_coredump *ee)
431 {
432 	const struct sseu_dev_info *sseu = &ee->engine->gt->info.sseu;
433 	int slice;
434 	int subslice;
435 
436 	err_printf(m, "  INSTDONE: 0x%08x\n",
437 		   ee->instdone.instdone);
438 
439 	if (ee->engine->class != RENDER_CLASS || INTEL_GEN(m->i915) <= 3)
440 		return;
441 
442 	err_printf(m, "  SC_INSTDONE: 0x%08x\n",
443 		   ee->instdone.slice_common);
444 
445 	if (INTEL_GEN(m->i915) <= 6)
446 		return;
447 
448 	for_each_instdone_slice_subslice(m->i915, sseu, slice, subslice)
449 		err_printf(m, "  SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
450 			   slice, subslice,
451 			   ee->instdone.sampler[slice][subslice]);
452 
453 	for_each_instdone_slice_subslice(m->i915, sseu, slice, subslice)
454 		err_printf(m, "  ROW_INSTDONE[%d][%d]: 0x%08x\n",
455 			   slice, subslice,
456 			   ee->instdone.row[slice][subslice]);
457 
458 	if (INTEL_GEN(m->i915) < 12)
459 		return;
460 
461 	err_printf(m, "  SC_INSTDONE_EXTRA: 0x%08x\n",
462 		   ee->instdone.slice_common_extra[0]);
463 	err_printf(m, "  SC_INSTDONE_EXTRA2: 0x%08x\n",
464 		   ee->instdone.slice_common_extra[1]);
465 }
466 
467 static void error_print_request(struct drm_i915_error_state_buf *m,
468 				const char *prefix,
469 				const struct i915_request_coredump *erq)
470 {
471 	if (!erq->seqno)
472 		return;
473 
474 	err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, head %08x, tail %08x\n",
475 		   prefix, erq->pid, erq->context, erq->seqno,
476 		   test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
477 			    &erq->flags) ? "!" : "",
478 		   test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
479 			    &erq->flags) ? "+" : "",
480 		   erq->sched_attr.priority,
481 		   erq->head, erq->tail);
482 }
483 
484 static void error_print_context(struct drm_i915_error_state_buf *m,
485 				const char *header,
486 				const struct i915_gem_context_coredump *ctx)
487 {
488 	const u32 period = m->i915->gt.clock_period_ns;
489 
490 	err_printf(m, "%s%s[%d] prio %d, guilty %d active %d, runtime total %lluns, avg %lluns\n",
491 		   header, ctx->comm, ctx->pid, ctx->sched_attr.priority,
492 		   ctx->guilty, ctx->active,
493 		   ctx->total_runtime * period,
494 		   mul_u32_u32(ctx->avg_runtime, period));
495 }
496 
497 static struct i915_vma_coredump *
498 __find_vma(struct i915_vma_coredump *vma, const char *name)
499 {
500 	while (vma) {
501 		if (strcmp(vma->name, name) == 0)
502 			return vma;
503 		vma = vma->next;
504 	}
505 
506 	return NULL;
507 }
508 
509 static struct i915_vma_coredump *
510 find_batch(const struct intel_engine_coredump *ee)
511 {
512 	return __find_vma(ee->vma, "batch");
513 }
514 
515 static void error_print_engine(struct drm_i915_error_state_buf *m,
516 			       const struct intel_engine_coredump *ee)
517 {
518 	struct i915_vma_coredump *batch;
519 	int n;
520 
521 	err_printf(m, "%s command stream:\n", ee->engine->name);
522 	err_printf(m, "  CCID:  0x%08x\n", ee->ccid);
523 	err_printf(m, "  START: 0x%08x\n", ee->start);
524 	err_printf(m, "  HEAD:  0x%08x [0x%08x]\n", ee->head, ee->rq_head);
525 	err_printf(m, "  TAIL:  0x%08x [0x%08x, 0x%08x]\n",
526 		   ee->tail, ee->rq_post, ee->rq_tail);
527 	err_printf(m, "  CTL:   0x%08x\n", ee->ctl);
528 	err_printf(m, "  MODE:  0x%08x\n", ee->mode);
529 	err_printf(m, "  HWS:   0x%08x\n", ee->hws);
530 	err_printf(m, "  ACTHD: 0x%08x %08x\n",
531 		   (u32)(ee->acthd>>32), (u32)ee->acthd);
532 	err_printf(m, "  IPEIR: 0x%08x\n", ee->ipeir);
533 	err_printf(m, "  IPEHR: 0x%08x\n", ee->ipehr);
534 	err_printf(m, "  ESR:   0x%08x\n", ee->esr);
535 
536 	error_print_instdone(m, ee);
537 
538 	batch = find_batch(ee);
539 	if (batch) {
540 		u64 start = batch->gtt_offset;
541 		u64 end = start + batch->gtt_size;
542 
543 		err_printf(m, "  batch: [0x%08x_%08x, 0x%08x_%08x]\n",
544 			   upper_32_bits(start), lower_32_bits(start),
545 			   upper_32_bits(end), lower_32_bits(end));
546 	}
547 	if (INTEL_GEN(m->i915) >= 4) {
548 		err_printf(m, "  BBADDR: 0x%08x_%08x\n",
549 			   (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
550 		err_printf(m, "  BB_STATE: 0x%08x\n", ee->bbstate);
551 		err_printf(m, "  INSTPS: 0x%08x\n", ee->instps);
552 	}
553 	err_printf(m, "  INSTPM: 0x%08x\n", ee->instpm);
554 	err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
555 		   lower_32_bits(ee->faddr));
556 	if (INTEL_GEN(m->i915) >= 6) {
557 		err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
558 		err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
559 	}
560 	if (HAS_PPGTT(m->i915)) {
561 		err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
562 
563 		if (INTEL_GEN(m->i915) >= 8) {
564 			int i;
565 			for (i = 0; i < 4; i++)
566 				err_printf(m, "  PDP%d: 0x%016llx\n",
567 					   i, ee->vm_info.pdp[i]);
568 		} else {
569 			err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
570 				   ee->vm_info.pp_dir_base);
571 		}
572 	}
573 	err_printf(m, "  hung: %u\n", ee->hung);
574 	err_printf(m, "  engine reset count: %u\n", ee->reset_count);
575 
576 	for (n = 0; n < ee->num_ports; n++) {
577 		err_printf(m, "  ELSP[%d]:", n);
578 		error_print_request(m, " ", &ee->execlist[n]);
579 	}
580 
581 	error_print_context(m, "  Active context: ", &ee->context);
582 }
583 
584 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
585 {
586 	va_list args;
587 
588 	va_start(args, f);
589 	i915_error_vprintf(e, f, args);
590 	va_end(args);
591 }
592 
593 static void print_error_vma(struct drm_i915_error_state_buf *m,
594 			    const struct intel_engine_cs *engine,
595 			    const struct i915_vma_coredump *vma)
596 {
597 	char out[ASCII85_BUFSZ];
598 	int page;
599 
600 	if (!vma)
601 		return;
602 
603 	err_printf(m, "%s --- %s = 0x%08x %08x\n",
604 		   engine ? engine->name : "global", vma->name,
605 		   upper_32_bits(vma->gtt_offset),
606 		   lower_32_bits(vma->gtt_offset));
607 
608 	if (vma->gtt_page_sizes > I915_GTT_PAGE_SIZE_4K)
609 		err_printf(m, "gtt_page_sizes = 0x%08x\n", vma->gtt_page_sizes);
610 
611 	err_compression_marker(m);
612 	for (page = 0; page < vma->page_count; page++) {
613 		int i, len;
614 
615 		len = PAGE_SIZE;
616 		if (page == vma->page_count - 1)
617 			len -= vma->unused;
618 		len = ascii85_encode_len(len);
619 
620 		for (i = 0; i < len; i++)
621 			err_puts(m, ascii85_encode(vma->pages[page][i], out));
622 	}
623 	err_puts(m, "\n");
624 }
625 
626 static void err_print_capabilities(struct drm_i915_error_state_buf *m,
627 				   struct i915_gpu_coredump *error)
628 {
629 	struct drm_printer p = i915_error_printer(m);
630 
631 	intel_device_info_print_static(&error->device_info, &p);
632 	intel_device_info_print_runtime(&error->runtime_info, &p);
633 	intel_driver_caps_print(&error->driver_caps, &p);
634 }
635 
636 static void err_print_params(struct drm_i915_error_state_buf *m,
637 			     const struct i915_params *params)
638 {
639 	struct drm_printer p = i915_error_printer(m);
640 
641 	i915_params_dump(params, &p);
642 }
643 
644 static void err_print_pciid(struct drm_i915_error_state_buf *m,
645 			    struct drm_i915_private *i915)
646 {
647 	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
648 
649 	err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
650 	err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
651 	err_printf(m, "PCI Subsystem: %04x:%04x\n",
652 		   pdev->subsystem_vendor,
653 		   pdev->subsystem_device);
654 }
655 
656 static void err_print_uc(struct drm_i915_error_state_buf *m,
657 			 const struct intel_uc_coredump *error_uc)
658 {
659 	struct drm_printer p = i915_error_printer(m);
660 
661 	intel_uc_fw_dump(&error_uc->guc_fw, &p);
662 	intel_uc_fw_dump(&error_uc->huc_fw, &p);
663 	print_error_vma(m, NULL, error_uc->guc_log);
664 }
665 
666 static void err_free_sgl(struct scatterlist *sgl)
667 {
668 	while (sgl) {
669 		struct scatterlist *sg;
670 
671 		for (sg = sgl; !sg_is_chain(sg); sg++) {
672 			kfree(sg_virt(sg));
673 			if (sg_is_last(sg))
674 				break;
675 		}
676 
677 		sg = sg_is_last(sg) ? NULL : sg_chain_ptr(sg);
678 		free_page((unsigned long)sgl);
679 		sgl = sg;
680 	}
681 }
682 
683 static void err_print_gt_info(struct drm_i915_error_state_buf *m,
684 			      struct intel_gt_coredump *gt)
685 {
686 	struct drm_printer p = i915_error_printer(m);
687 
688 	intel_gt_info_print(&gt->info, &p);
689 	intel_sseu_print_topology(&gt->info.sseu, &p);
690 }
691 
692 static void err_print_gt(struct drm_i915_error_state_buf *m,
693 			 struct intel_gt_coredump *gt)
694 {
695 	const struct intel_engine_coredump *ee;
696 	int i;
697 
698 	err_printf(m, "GT awake: %s\n", yesno(gt->awake));
699 	err_printf(m, "EIR: 0x%08x\n", gt->eir);
700 	err_printf(m, "IER: 0x%08x\n", gt->ier);
701 	for (i = 0; i < gt->ngtier; i++)
702 		err_printf(m, "GTIER[%d]: 0x%08x\n", i, gt->gtier[i]);
703 	err_printf(m, "PGTBL_ER: 0x%08x\n", gt->pgtbl_er);
704 	err_printf(m, "FORCEWAKE: 0x%08x\n", gt->forcewake);
705 	err_printf(m, "DERRMR: 0x%08x\n", gt->derrmr);
706 
707 	for (i = 0; i < gt->nfence; i++)
708 		err_printf(m, "  fence[%d] = %08llx\n", i, gt->fence[i]);
709 
710 	if (IS_GEN_RANGE(m->i915, 6, 11)) {
711 		err_printf(m, "ERROR: 0x%08x\n", gt->error);
712 		err_printf(m, "DONE_REG: 0x%08x\n", gt->done_reg);
713 	}
714 
715 	if (INTEL_GEN(m->i915) >= 8)
716 		err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
717 			   gt->fault_data1, gt->fault_data0);
718 
719 	if (IS_GEN(m->i915, 7))
720 		err_printf(m, "ERR_INT: 0x%08x\n", gt->err_int);
721 
722 	if (IS_GEN_RANGE(m->i915, 8, 11))
723 		err_printf(m, "GTT_CACHE_EN: 0x%08x\n", gt->gtt_cache);
724 
725 	if (IS_GEN(m->i915, 12))
726 		err_printf(m, "AUX_ERR_DBG: 0x%08x\n", gt->aux_err);
727 
728 	if (INTEL_GEN(m->i915) >= 12) {
729 		int i;
730 
731 		for (i = 0; i < GEN12_SFC_DONE_MAX; i++)
732 			err_printf(m, "  SFC_DONE[%d]: 0x%08x\n", i,
733 				   gt->sfc_done[i]);
734 
735 		err_printf(m, "  GAM_DONE: 0x%08x\n", gt->gam_done);
736 	}
737 
738 	for (ee = gt->engine; ee; ee = ee->next) {
739 		const struct i915_vma_coredump *vma;
740 
741 		error_print_engine(m, ee);
742 		for (vma = ee->vma; vma; vma = vma->next)
743 			print_error_vma(m, ee->engine, vma);
744 	}
745 
746 	if (gt->uc)
747 		err_print_uc(m, gt->uc);
748 
749 	err_print_gt_info(m, gt);
750 }
751 
752 static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
753 			       struct i915_gpu_coredump *error)
754 {
755 	const struct intel_engine_coredump *ee;
756 	struct timespec64 ts;
757 
758 	if (*error->error_msg)
759 		err_printf(m, "%s\n", error->error_msg);
760 	err_printf(m, "Kernel: %s %s\n",
761 		   init_utsname()->release,
762 		   init_utsname()->machine);
763 	err_printf(m, "Driver: %s\n", DRIVER_DATE);
764 	ts = ktime_to_timespec64(error->time);
765 	err_printf(m, "Time: %lld s %ld us\n",
766 		   (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
767 	ts = ktime_to_timespec64(error->boottime);
768 	err_printf(m, "Boottime: %lld s %ld us\n",
769 		   (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
770 	ts = ktime_to_timespec64(error->uptime);
771 	err_printf(m, "Uptime: %lld s %ld us\n",
772 		   (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
773 	err_printf(m, "Capture: %lu jiffies; %d ms ago\n",
774 		   error->capture, jiffies_to_msecs(jiffies - error->capture));
775 
776 	for (ee = error->gt ? error->gt->engine : NULL; ee; ee = ee->next)
777 		err_printf(m, "Active process (on ring %s): %s [%d]\n",
778 			   ee->engine->name,
779 			   ee->context.comm,
780 			   ee->context.pid);
781 
782 	err_printf(m, "Reset count: %u\n", error->reset_count);
783 	err_printf(m, "Suspend count: %u\n", error->suspend_count);
784 	err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
785 	err_printf(m, "Subplatform: 0x%x\n",
786 		   intel_subplatform(&error->runtime_info,
787 				     error->device_info.platform));
788 	err_print_pciid(m, m->i915);
789 
790 	err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
791 
792 	if (HAS_CSR(m->i915)) {
793 		struct intel_csr *csr = &m->i915->csr;
794 
795 		err_printf(m, "DMC loaded: %s\n",
796 			   yesno(csr->dmc_payload != NULL));
797 		err_printf(m, "DMC fw version: %d.%d\n",
798 			   CSR_VERSION_MAJOR(csr->version),
799 			   CSR_VERSION_MINOR(csr->version));
800 	}
801 
802 	err_printf(m, "RPM wakelock: %s\n", yesno(error->wakelock));
803 	err_printf(m, "PM suspended: %s\n", yesno(error->suspended));
804 
805 	if (error->gt)
806 		err_print_gt(m, error->gt);
807 
808 	if (error->overlay)
809 		intel_overlay_print_error_state(m, error->overlay);
810 
811 	if (error->display)
812 		intel_display_print_error_state(m, error->display);
813 
814 	err_print_capabilities(m, error);
815 	err_print_params(m, &error->params);
816 }
817 
818 static int err_print_to_sgl(struct i915_gpu_coredump *error)
819 {
820 	struct drm_i915_error_state_buf m;
821 
822 	if (IS_ERR(error))
823 		return PTR_ERR(error);
824 
825 	if (READ_ONCE(error->sgl))
826 		return 0;
827 
828 	memset(&m, 0, sizeof(m));
829 	m.i915 = error->i915;
830 
831 	__err_print_to_sgl(&m, error);
832 
833 	if (m.buf) {
834 		__sg_set_buf(m.cur++, m.buf, m.bytes, m.iter);
835 		m.bytes = 0;
836 		m.buf = NULL;
837 	}
838 	if (m.cur) {
839 		GEM_BUG_ON(m.end < m.cur);
840 		sg_mark_end(m.cur - 1);
841 	}
842 	GEM_BUG_ON(m.sgl && !m.cur);
843 
844 	if (m.err) {
845 		err_free_sgl(m.sgl);
846 		return m.err;
847 	}
848 
849 	if (cmpxchg(&error->sgl, NULL, m.sgl))
850 		err_free_sgl(m.sgl);
851 
852 	return 0;
853 }
854 
855 ssize_t i915_gpu_coredump_copy_to_buffer(struct i915_gpu_coredump *error,
856 					 char *buf, loff_t off, size_t rem)
857 {
858 	struct scatterlist *sg;
859 	size_t count;
860 	loff_t pos;
861 	int err;
862 
863 	if (!error || !rem)
864 		return 0;
865 
866 	err = err_print_to_sgl(error);
867 	if (err)
868 		return err;
869 
870 	sg = READ_ONCE(error->fit);
871 	if (!sg || off < sg->dma_address)
872 		sg = error->sgl;
873 	if (!sg)
874 		return 0;
875 
876 	pos = sg->dma_address;
877 	count = 0;
878 	do {
879 		size_t len, start;
880 
881 		if (sg_is_chain(sg)) {
882 			sg = sg_chain_ptr(sg);
883 			GEM_BUG_ON(sg_is_chain(sg));
884 		}
885 
886 		len = sg->length;
887 		if (pos + len <= off) {
888 			pos += len;
889 			continue;
890 		}
891 
892 		start = sg->offset;
893 		if (pos < off) {
894 			GEM_BUG_ON(off - pos > len);
895 			len -= off - pos;
896 			start += off - pos;
897 			pos = off;
898 		}
899 
900 		len = min(len, rem);
901 		GEM_BUG_ON(!len || len > sg->length);
902 
903 		memcpy(buf, page_address(sg_page(sg)) + start, len);
904 
905 		count += len;
906 		pos += len;
907 
908 		buf += len;
909 		rem -= len;
910 		if (!rem) {
911 			WRITE_ONCE(error->fit, sg);
912 			break;
913 		}
914 	} while (!sg_is_last(sg++));
915 
916 	return count;
917 }
918 
919 static void i915_vma_coredump_free(struct i915_vma_coredump *vma)
920 {
921 	while (vma) {
922 		struct i915_vma_coredump *next = vma->next;
923 		int page;
924 
925 		for (page = 0; page < vma->page_count; page++)
926 			free_page((unsigned long)vma->pages[page]);
927 
928 		kfree(vma);
929 		vma = next;
930 	}
931 }
932 
933 static void cleanup_params(struct i915_gpu_coredump *error)
934 {
935 	i915_params_free(&error->params);
936 }
937 
938 static void cleanup_uc(struct intel_uc_coredump *uc)
939 {
940 	kfree(uc->guc_fw.path);
941 	kfree(uc->huc_fw.path);
942 	i915_vma_coredump_free(uc->guc_log);
943 
944 	kfree(uc);
945 }
946 
947 static void cleanup_gt(struct intel_gt_coredump *gt)
948 {
949 	while (gt->engine) {
950 		struct intel_engine_coredump *ee = gt->engine;
951 
952 		gt->engine = ee->next;
953 
954 		i915_vma_coredump_free(ee->vma);
955 		kfree(ee);
956 	}
957 
958 	if (gt->uc)
959 		cleanup_uc(gt->uc);
960 
961 	kfree(gt);
962 }
963 
964 void __i915_gpu_coredump_free(struct kref *error_ref)
965 {
966 	struct i915_gpu_coredump *error =
967 		container_of(error_ref, typeof(*error), ref);
968 
969 	while (error->gt) {
970 		struct intel_gt_coredump *gt = error->gt;
971 
972 		error->gt = gt->next;
973 		cleanup_gt(gt);
974 	}
975 
976 	kfree(error->overlay);
977 	kfree(error->display);
978 
979 	cleanup_params(error);
980 
981 	err_free_sgl(error->sgl);
982 	kfree(error);
983 }
984 
985 static struct i915_vma_coredump *
986 i915_vma_coredump_create(const struct intel_gt *gt,
987 			 const struct i915_vma *vma,
988 			 const char *name,
989 			 struct i915_vma_compress *compress)
990 {
991 	struct i915_ggtt *ggtt = gt->ggtt;
992 	const u64 slot = ggtt->error_capture.start;
993 	struct i915_vma_coredump *dst;
994 	unsigned long num_pages;
995 	struct sgt_iter iter;
996 	int ret;
997 
998 	might_sleep();
999 
1000 	if (!vma || !vma->pages || !compress)
1001 		return NULL;
1002 
1003 	num_pages = min_t(u64, vma->size, vma->obj->base.size) >> PAGE_SHIFT;
1004 	num_pages = DIV_ROUND_UP(10 * num_pages, 8); /* worstcase zlib growth */
1005 	dst = kmalloc(sizeof(*dst) + num_pages * sizeof(u32 *), ALLOW_FAIL);
1006 	if (!dst)
1007 		return NULL;
1008 
1009 	if (!compress_start(compress)) {
1010 		kfree(dst);
1011 		return NULL;
1012 	}
1013 
1014 	strcpy(dst->name, name);
1015 	dst->next = NULL;
1016 
1017 	dst->gtt_offset = vma->node.start;
1018 	dst->gtt_size = vma->node.size;
1019 	dst->gtt_page_sizes = vma->page_sizes.gtt;
1020 	dst->num_pages = num_pages;
1021 	dst->page_count = 0;
1022 	dst->unused = 0;
1023 
1024 	ret = -EINVAL;
1025 	if (drm_mm_node_allocated(&ggtt->error_capture)) {
1026 		void __iomem *s;
1027 		dma_addr_t dma;
1028 
1029 		for_each_sgt_daddr(dma, iter, vma->pages) {
1030 			mutex_lock(&ggtt->error_mutex);
1031 			ggtt->vm.insert_page(&ggtt->vm, dma, slot,
1032 					     I915_CACHE_NONE, 0);
1033 			mb();
1034 
1035 			s = io_mapping_map_wc(&ggtt->iomap, slot, PAGE_SIZE);
1036 			ret = compress_page(compress,
1037 					    (void  __force *)s, dst,
1038 					    true);
1039 			io_mapping_unmap(s);
1040 
1041 			mb();
1042 			ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
1043 			mutex_unlock(&ggtt->error_mutex);
1044 			if (ret)
1045 				break;
1046 		}
1047 	} else if (i915_gem_object_is_lmem(vma->obj)) {
1048 		struct intel_memory_region *mem = vma->obj->mm.region;
1049 		dma_addr_t dma;
1050 
1051 		for_each_sgt_daddr(dma, iter, vma->pages) {
1052 			void __iomem *s;
1053 
1054 			s = io_mapping_map_wc(&mem->iomap,
1055 					      dma - mem->region.start,
1056 					      PAGE_SIZE);
1057 			ret = compress_page(compress,
1058 					    (void __force *)s, dst,
1059 					    true);
1060 			io_mapping_unmap(s);
1061 			if (ret)
1062 				break;
1063 		}
1064 	} else {
1065 		struct page *page;
1066 
1067 		for_each_sgt_page(page, iter, vma->pages) {
1068 			void *s;
1069 
1070 			drm_clflush_pages(&page, 1);
1071 
1072 			s = kmap(page);
1073 			ret = compress_page(compress, s, dst, false);
1074 			kunmap(page);
1075 
1076 			drm_clflush_pages(&page, 1);
1077 
1078 			if (ret)
1079 				break;
1080 		}
1081 	}
1082 
1083 	if (ret || compress_flush(compress, dst)) {
1084 		while (dst->page_count--)
1085 			pool_free(&compress->pool, dst->pages[dst->page_count]);
1086 		kfree(dst);
1087 		dst = NULL;
1088 	}
1089 	compress_finish(compress);
1090 
1091 	return dst;
1092 }
1093 
1094 static void gt_record_fences(struct intel_gt_coredump *gt)
1095 {
1096 	struct i915_ggtt *ggtt = gt->_gt->ggtt;
1097 	struct intel_uncore *uncore = gt->_gt->uncore;
1098 	int i;
1099 
1100 	if (INTEL_GEN(uncore->i915) >= 6) {
1101 		for (i = 0; i < ggtt->num_fences; i++)
1102 			gt->fence[i] =
1103 				intel_uncore_read64(uncore,
1104 						    FENCE_REG_GEN6_LO(i));
1105 	} else if (INTEL_GEN(uncore->i915) >= 4) {
1106 		for (i = 0; i < ggtt->num_fences; i++)
1107 			gt->fence[i] =
1108 				intel_uncore_read64(uncore,
1109 						    FENCE_REG_965_LO(i));
1110 	} else {
1111 		for (i = 0; i < ggtt->num_fences; i++)
1112 			gt->fence[i] =
1113 				intel_uncore_read(uncore, FENCE_REG(i));
1114 	}
1115 	gt->nfence = i;
1116 }
1117 
1118 static void engine_record_registers(struct intel_engine_coredump *ee)
1119 {
1120 	const struct intel_engine_cs *engine = ee->engine;
1121 	struct drm_i915_private *i915 = engine->i915;
1122 
1123 	if (INTEL_GEN(i915) >= 6) {
1124 		ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
1125 
1126 		if (INTEL_GEN(i915) >= 12)
1127 			ee->fault_reg = intel_uncore_read(engine->uncore,
1128 							  GEN12_RING_FAULT_REG);
1129 		else if (INTEL_GEN(i915) >= 8)
1130 			ee->fault_reg = intel_uncore_read(engine->uncore,
1131 							  GEN8_RING_FAULT_REG);
1132 		else
1133 			ee->fault_reg = GEN6_RING_FAULT_REG_READ(engine);
1134 	}
1135 
1136 	if (INTEL_GEN(i915) >= 4) {
1137 		ee->esr = ENGINE_READ(engine, RING_ESR);
1138 		ee->faddr = ENGINE_READ(engine, RING_DMA_FADD);
1139 		ee->ipeir = ENGINE_READ(engine, RING_IPEIR);
1140 		ee->ipehr = ENGINE_READ(engine, RING_IPEHR);
1141 		ee->instps = ENGINE_READ(engine, RING_INSTPS);
1142 		ee->bbaddr = ENGINE_READ(engine, RING_BBADDR);
1143 		ee->ccid = ENGINE_READ(engine, CCID);
1144 		if (INTEL_GEN(i915) >= 8) {
1145 			ee->faddr |= (u64)ENGINE_READ(engine, RING_DMA_FADD_UDW) << 32;
1146 			ee->bbaddr |= (u64)ENGINE_READ(engine, RING_BBADDR_UDW) << 32;
1147 		}
1148 		ee->bbstate = ENGINE_READ(engine, RING_BBSTATE);
1149 	} else {
1150 		ee->faddr = ENGINE_READ(engine, DMA_FADD_I8XX);
1151 		ee->ipeir = ENGINE_READ(engine, IPEIR);
1152 		ee->ipehr = ENGINE_READ(engine, IPEHR);
1153 	}
1154 
1155 	intel_engine_get_instdone(engine, &ee->instdone);
1156 
1157 	ee->instpm = ENGINE_READ(engine, RING_INSTPM);
1158 	ee->acthd = intel_engine_get_active_head(engine);
1159 	ee->start = ENGINE_READ(engine, RING_START);
1160 	ee->head = ENGINE_READ(engine, RING_HEAD);
1161 	ee->tail = ENGINE_READ(engine, RING_TAIL);
1162 	ee->ctl = ENGINE_READ(engine, RING_CTL);
1163 	if (INTEL_GEN(i915) > 2)
1164 		ee->mode = ENGINE_READ(engine, RING_MI_MODE);
1165 
1166 	if (!HWS_NEEDS_PHYSICAL(i915)) {
1167 		i915_reg_t mmio;
1168 
1169 		if (IS_GEN(i915, 7)) {
1170 			switch (engine->id) {
1171 			default:
1172 				MISSING_CASE(engine->id);
1173 				fallthrough;
1174 			case RCS0:
1175 				mmio = RENDER_HWS_PGA_GEN7;
1176 				break;
1177 			case BCS0:
1178 				mmio = BLT_HWS_PGA_GEN7;
1179 				break;
1180 			case VCS0:
1181 				mmio = BSD_HWS_PGA_GEN7;
1182 				break;
1183 			case VECS0:
1184 				mmio = VEBOX_HWS_PGA_GEN7;
1185 				break;
1186 			}
1187 		} else if (IS_GEN(engine->i915, 6)) {
1188 			mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1189 		} else {
1190 			/* XXX: gen8 returns to sanity */
1191 			mmio = RING_HWS_PGA(engine->mmio_base);
1192 		}
1193 
1194 		ee->hws = intel_uncore_read(engine->uncore, mmio);
1195 	}
1196 
1197 	ee->reset_count = i915_reset_engine_count(&i915->gpu_error, engine);
1198 
1199 	if (HAS_PPGTT(i915)) {
1200 		int i;
1201 
1202 		ee->vm_info.gfx_mode = ENGINE_READ(engine, RING_MODE_GEN7);
1203 
1204 		if (IS_GEN(i915, 6)) {
1205 			ee->vm_info.pp_dir_base =
1206 				ENGINE_READ(engine, RING_PP_DIR_BASE_READ);
1207 		} else if (IS_GEN(i915, 7)) {
1208 			ee->vm_info.pp_dir_base =
1209 				ENGINE_READ(engine, RING_PP_DIR_BASE);
1210 		} else if (INTEL_GEN(i915) >= 8) {
1211 			u32 base = engine->mmio_base;
1212 
1213 			for (i = 0; i < 4; i++) {
1214 				ee->vm_info.pdp[i] =
1215 					intel_uncore_read(engine->uncore,
1216 							  GEN8_RING_PDP_UDW(base, i));
1217 				ee->vm_info.pdp[i] <<= 32;
1218 				ee->vm_info.pdp[i] |=
1219 					intel_uncore_read(engine->uncore,
1220 							  GEN8_RING_PDP_LDW(base, i));
1221 			}
1222 		}
1223 	}
1224 }
1225 
1226 static void record_request(const struct i915_request *request,
1227 			   struct i915_request_coredump *erq)
1228 {
1229 	erq->flags = request->fence.flags;
1230 	erq->context = request->fence.context;
1231 	erq->seqno = request->fence.seqno;
1232 	erq->sched_attr = request->sched.attr;
1233 	erq->head = request->head;
1234 	erq->tail = request->tail;
1235 
1236 	erq->pid = 0;
1237 	rcu_read_lock();
1238 	if (!intel_context_is_closed(request->context)) {
1239 		const struct i915_gem_context *ctx;
1240 
1241 		ctx = rcu_dereference(request->context->gem_context);
1242 		if (ctx)
1243 			erq->pid = pid_nr(ctx->pid);
1244 	}
1245 	rcu_read_unlock();
1246 }
1247 
1248 static void engine_record_execlists(struct intel_engine_coredump *ee)
1249 {
1250 	const struct intel_engine_execlists * const el = &ee->engine->execlists;
1251 	struct i915_request * const *port = el->active;
1252 	unsigned int n = 0;
1253 
1254 	while (*port)
1255 		record_request(*port++, &ee->execlist[n++]);
1256 
1257 	ee->num_ports = n;
1258 }
1259 
1260 static bool record_context(struct i915_gem_context_coredump *e,
1261 			   const struct i915_request *rq)
1262 {
1263 	struct i915_gem_context *ctx;
1264 	struct task_struct *task;
1265 	bool simulated;
1266 
1267 	rcu_read_lock();
1268 	ctx = rcu_dereference(rq->context->gem_context);
1269 	if (ctx && !kref_get_unless_zero(&ctx->ref))
1270 		ctx = NULL;
1271 	rcu_read_unlock();
1272 	if (!ctx)
1273 		return true;
1274 
1275 	rcu_read_lock();
1276 	task = pid_task(ctx->pid, PIDTYPE_PID);
1277 	if (task) {
1278 		strcpy(e->comm, task->comm);
1279 		e->pid = task->pid;
1280 	}
1281 	rcu_read_unlock();
1282 
1283 	e->sched_attr = ctx->sched;
1284 	e->guilty = atomic_read(&ctx->guilty_count);
1285 	e->active = atomic_read(&ctx->active_count);
1286 
1287 	e->total_runtime = rq->context->runtime.total;
1288 	e->avg_runtime = ewma_runtime_read(&rq->context->runtime.avg);
1289 
1290 	simulated = i915_gem_context_no_error_capture(ctx);
1291 
1292 	i915_gem_context_put(ctx);
1293 	return simulated;
1294 }
1295 
1296 struct intel_engine_capture_vma {
1297 	struct intel_engine_capture_vma *next;
1298 	struct i915_vma *vma;
1299 	char name[16];
1300 };
1301 
1302 static struct intel_engine_capture_vma *
1303 capture_vma(struct intel_engine_capture_vma *next,
1304 	    struct i915_vma *vma,
1305 	    const char *name,
1306 	    gfp_t gfp)
1307 {
1308 	struct intel_engine_capture_vma *c;
1309 
1310 	if (!vma)
1311 		return next;
1312 
1313 	c = kmalloc(sizeof(*c), gfp);
1314 	if (!c)
1315 		return next;
1316 
1317 	if (!i915_active_acquire_if_busy(&vma->active)) {
1318 		kfree(c);
1319 		return next;
1320 	}
1321 
1322 	strcpy(c->name, name);
1323 	c->vma = vma; /* reference held while active */
1324 
1325 	c->next = next;
1326 	return c;
1327 }
1328 
1329 static struct intel_engine_capture_vma *
1330 capture_user(struct intel_engine_capture_vma *capture,
1331 	     const struct i915_request *rq,
1332 	     gfp_t gfp)
1333 {
1334 	struct i915_capture_list *c;
1335 
1336 	for (c = rq->capture_list; c; c = c->next)
1337 		capture = capture_vma(capture, c->vma, "user", gfp);
1338 
1339 	return capture;
1340 }
1341 
1342 static void add_vma(struct intel_engine_coredump *ee,
1343 		    struct i915_vma_coredump *vma)
1344 {
1345 	if (vma) {
1346 		vma->next = ee->vma;
1347 		ee->vma = vma;
1348 	}
1349 }
1350 
1351 struct intel_engine_coredump *
1352 intel_engine_coredump_alloc(struct intel_engine_cs *engine, gfp_t gfp)
1353 {
1354 	struct intel_engine_coredump *ee;
1355 
1356 	ee = kzalloc(sizeof(*ee), gfp);
1357 	if (!ee)
1358 		return NULL;
1359 
1360 	ee->engine = engine;
1361 
1362 	engine_record_registers(ee);
1363 	engine_record_execlists(ee);
1364 
1365 	return ee;
1366 }
1367 
1368 struct intel_engine_capture_vma *
1369 intel_engine_coredump_add_request(struct intel_engine_coredump *ee,
1370 				  struct i915_request *rq,
1371 				  gfp_t gfp)
1372 {
1373 	struct intel_engine_capture_vma *vma = NULL;
1374 
1375 	ee->simulated |= record_context(&ee->context, rq);
1376 	if (ee->simulated)
1377 		return NULL;
1378 
1379 	/*
1380 	 * We need to copy these to an anonymous buffer
1381 	 * as the simplest method to avoid being overwritten
1382 	 * by userspace.
1383 	 */
1384 	vma = capture_vma(vma, rq->batch, "batch", gfp);
1385 	vma = capture_user(vma, rq, gfp);
1386 	vma = capture_vma(vma, rq->ring->vma, "ring", gfp);
1387 	vma = capture_vma(vma, rq->context->state, "HW context", gfp);
1388 
1389 	ee->rq_head = rq->head;
1390 	ee->rq_post = rq->postfix;
1391 	ee->rq_tail = rq->tail;
1392 
1393 	return vma;
1394 }
1395 
1396 void
1397 intel_engine_coredump_add_vma(struct intel_engine_coredump *ee,
1398 			      struct intel_engine_capture_vma *capture,
1399 			      struct i915_vma_compress *compress)
1400 {
1401 	const struct intel_engine_cs *engine = ee->engine;
1402 
1403 	while (capture) {
1404 		struct intel_engine_capture_vma *this = capture;
1405 		struct i915_vma *vma = this->vma;
1406 
1407 		add_vma(ee,
1408 			i915_vma_coredump_create(engine->gt,
1409 						 vma, this->name,
1410 						 compress));
1411 
1412 		i915_active_release(&vma->active);
1413 
1414 		capture = this->next;
1415 		kfree(this);
1416 	}
1417 
1418 	add_vma(ee,
1419 		i915_vma_coredump_create(engine->gt,
1420 					 engine->status_page.vma,
1421 					 "HW Status",
1422 					 compress));
1423 
1424 	add_vma(ee,
1425 		i915_vma_coredump_create(engine->gt,
1426 					 engine->wa_ctx.vma,
1427 					 "WA context",
1428 					 compress));
1429 }
1430 
1431 static struct intel_engine_coredump *
1432 capture_engine(struct intel_engine_cs *engine,
1433 	       struct i915_vma_compress *compress)
1434 {
1435 	struct intel_engine_capture_vma *capture = NULL;
1436 	struct intel_engine_coredump *ee;
1437 	struct i915_request *rq;
1438 	unsigned long flags;
1439 
1440 	ee = intel_engine_coredump_alloc(engine, GFP_KERNEL);
1441 	if (!ee)
1442 		return NULL;
1443 
1444 	spin_lock_irqsave(&engine->active.lock, flags);
1445 	rq = intel_engine_find_active_request(engine);
1446 	if (rq)
1447 		capture = intel_engine_coredump_add_request(ee, rq,
1448 							    ATOMIC_MAYFAIL);
1449 	spin_unlock_irqrestore(&engine->active.lock, flags);
1450 	if (!capture) {
1451 		kfree(ee);
1452 		return NULL;
1453 	}
1454 
1455 	intel_engine_coredump_add_vma(ee, capture, compress);
1456 
1457 	return ee;
1458 }
1459 
1460 static void
1461 gt_record_engines(struct intel_gt_coredump *gt,
1462 		  intel_engine_mask_t engine_mask,
1463 		  struct i915_vma_compress *compress)
1464 {
1465 	struct intel_engine_cs *engine;
1466 	enum intel_engine_id id;
1467 
1468 	for_each_engine(engine, gt->_gt, id) {
1469 		struct intel_engine_coredump *ee;
1470 
1471 		/* Refill our page pool before entering atomic section */
1472 		pool_refill(&compress->pool, ALLOW_FAIL);
1473 
1474 		ee = capture_engine(engine, compress);
1475 		if (!ee)
1476 			continue;
1477 
1478 		ee->hung = engine->mask & engine_mask;
1479 
1480 		gt->simulated |= ee->simulated;
1481 		if (ee->simulated) {
1482 			kfree(ee);
1483 			continue;
1484 		}
1485 
1486 		ee->next = gt->engine;
1487 		gt->engine = ee;
1488 	}
1489 }
1490 
1491 static struct intel_uc_coredump *
1492 gt_record_uc(struct intel_gt_coredump *gt,
1493 	     struct i915_vma_compress *compress)
1494 {
1495 	const struct intel_uc *uc = &gt->_gt->uc;
1496 	struct intel_uc_coredump *error_uc;
1497 
1498 	error_uc = kzalloc(sizeof(*error_uc), ALLOW_FAIL);
1499 	if (!error_uc)
1500 		return NULL;
1501 
1502 	memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
1503 	memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
1504 
1505 	/* Non-default firmware paths will be specified by the modparam.
1506 	 * As modparams are generally accesible from the userspace make
1507 	 * explicit copies of the firmware paths.
1508 	 */
1509 	error_uc->guc_fw.path = kstrdup(uc->guc.fw.path, ALLOW_FAIL);
1510 	error_uc->huc_fw.path = kstrdup(uc->huc.fw.path, ALLOW_FAIL);
1511 	error_uc->guc_log =
1512 		i915_vma_coredump_create(gt->_gt,
1513 					 uc->guc.log.vma, "GuC log buffer",
1514 					 compress);
1515 
1516 	return error_uc;
1517 }
1518 
1519 /* Capture all registers which don't fit into another category. */
1520 static void gt_record_regs(struct intel_gt_coredump *gt)
1521 {
1522 	struct intel_uncore *uncore = gt->_gt->uncore;
1523 	struct drm_i915_private *i915 = uncore->i915;
1524 	int i;
1525 
1526 	/*
1527 	 * General organization
1528 	 * 1. Registers specific to a single generation
1529 	 * 2. Registers which belong to multiple generations
1530 	 * 3. Feature specific registers.
1531 	 * 4. Everything else
1532 	 * Please try to follow the order.
1533 	 */
1534 
1535 	/* 1: Registers specific to a single generation */
1536 	if (IS_VALLEYVIEW(i915)) {
1537 		gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1538 		gt->ier = intel_uncore_read(uncore, VLV_IER);
1539 		gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_VLV);
1540 	}
1541 
1542 	if (IS_GEN(i915, 7))
1543 		gt->err_int = intel_uncore_read(uncore, GEN7_ERR_INT);
1544 
1545 	if (INTEL_GEN(i915) >= 12) {
1546 		gt->fault_data0 = intel_uncore_read(uncore,
1547 						    GEN12_FAULT_TLB_DATA0);
1548 		gt->fault_data1 = intel_uncore_read(uncore,
1549 						    GEN12_FAULT_TLB_DATA1);
1550 	} else if (INTEL_GEN(i915) >= 8) {
1551 		gt->fault_data0 = intel_uncore_read(uncore,
1552 						    GEN8_FAULT_TLB_DATA0);
1553 		gt->fault_data1 = intel_uncore_read(uncore,
1554 						    GEN8_FAULT_TLB_DATA1);
1555 	}
1556 
1557 	if (IS_GEN(i915, 6)) {
1558 		gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE);
1559 		gt->gab_ctl = intel_uncore_read(uncore, GAB_CTL);
1560 		gt->gfx_mode = intel_uncore_read(uncore, GFX_MODE);
1561 	}
1562 
1563 	/* 2: Registers which belong to multiple generations */
1564 	if (INTEL_GEN(i915) >= 7)
1565 		gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
1566 
1567 	if (INTEL_GEN(i915) >= 6) {
1568 		gt->derrmr = intel_uncore_read(uncore, DERRMR);
1569 		if (INTEL_GEN(i915) < 12) {
1570 			gt->error = intel_uncore_read(uncore, ERROR_GEN6);
1571 			gt->done_reg = intel_uncore_read(uncore, DONE_REG);
1572 		}
1573 	}
1574 
1575 	/* 3: Feature specific registers */
1576 	if (IS_GEN_RANGE(i915, 6, 7)) {
1577 		gt->gam_ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
1578 		gt->gac_eco = intel_uncore_read(uncore, GAC_ECO_BITS);
1579 	}
1580 
1581 	if (IS_GEN_RANGE(i915, 8, 11))
1582 		gt->gtt_cache = intel_uncore_read(uncore, HSW_GTT_CACHE_EN);
1583 
1584 	if (IS_GEN(i915, 12))
1585 		gt->aux_err = intel_uncore_read(uncore, GEN12_AUX_ERR_DBG);
1586 
1587 	if (INTEL_GEN(i915) >= 12) {
1588 		for (i = 0; i < GEN12_SFC_DONE_MAX; i++) {
1589 			gt->sfc_done[i] =
1590 				intel_uncore_read(uncore, GEN12_SFC_DONE(i));
1591 		}
1592 
1593 		gt->gam_done = intel_uncore_read(uncore, GEN12_GAM_DONE);
1594 	}
1595 
1596 	/* 4: Everything else */
1597 	if (INTEL_GEN(i915) >= 11) {
1598 		gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1599 		gt->gtier[0] =
1600 			intel_uncore_read(uncore,
1601 					  GEN11_RENDER_COPY_INTR_ENABLE);
1602 		gt->gtier[1] =
1603 			intel_uncore_read(uncore, GEN11_VCS_VECS_INTR_ENABLE);
1604 		gt->gtier[2] =
1605 			intel_uncore_read(uncore, GEN11_GUC_SG_INTR_ENABLE);
1606 		gt->gtier[3] =
1607 			intel_uncore_read(uncore,
1608 					  GEN11_GPM_WGBOXPERF_INTR_ENABLE);
1609 		gt->gtier[4] =
1610 			intel_uncore_read(uncore,
1611 					  GEN11_CRYPTO_RSVD_INTR_ENABLE);
1612 		gt->gtier[5] =
1613 			intel_uncore_read(uncore,
1614 					  GEN11_GUNIT_CSME_INTR_ENABLE);
1615 		gt->ngtier = 6;
1616 	} else if (INTEL_GEN(i915) >= 8) {
1617 		gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1618 		for (i = 0; i < 4; i++)
1619 			gt->gtier[i] =
1620 				intel_uncore_read(uncore, GEN8_GT_IER(i));
1621 		gt->ngtier = 4;
1622 	} else if (HAS_PCH_SPLIT(i915)) {
1623 		gt->ier = intel_uncore_read(uncore, DEIER);
1624 		gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1625 		gt->ngtier = 1;
1626 	} else if (IS_GEN(i915, 2)) {
1627 		gt->ier = intel_uncore_read16(uncore, GEN2_IER);
1628 	} else if (!IS_VALLEYVIEW(i915)) {
1629 		gt->ier = intel_uncore_read(uncore, GEN2_IER);
1630 	}
1631 	gt->eir = intel_uncore_read(uncore, EIR);
1632 	gt->pgtbl_er = intel_uncore_read(uncore, PGTBL_ER);
1633 }
1634 
1635 static void gt_record_info(struct intel_gt_coredump *gt)
1636 {
1637 	memcpy(&gt->info, &gt->_gt->info, sizeof(struct intel_gt_info));
1638 }
1639 
1640 /*
1641  * Generate a semi-unique error code. The code is not meant to have meaning, The
1642  * code's only purpose is to try to prevent false duplicated bug reports by
1643  * grossly estimating a GPU error state.
1644  *
1645  * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
1646  * the hang if we could strip the GTT offset information from it.
1647  *
1648  * It's only a small step better than a random number in its current form.
1649  */
1650 static u32 generate_ecode(const struct intel_engine_coredump *ee)
1651 {
1652 	/*
1653 	 * IPEHR would be an ideal way to detect errors, as it's the gross
1654 	 * measure of "the command that hung." However, has some very common
1655 	 * synchronization commands which almost always appear in the case
1656 	 * strictly a client bug. Use instdone to differentiate those some.
1657 	 */
1658 	return ee ? ee->ipehr ^ ee->instdone.instdone : 0;
1659 }
1660 
1661 static const char *error_msg(struct i915_gpu_coredump *error)
1662 {
1663 	struct intel_engine_coredump *first = NULL;
1664 	unsigned int hung_classes = 0;
1665 	struct intel_gt_coredump *gt;
1666 	int len;
1667 
1668 	for (gt = error->gt; gt; gt = gt->next) {
1669 		struct intel_engine_coredump *cs;
1670 
1671 		for (cs = gt->engine; cs; cs = cs->next) {
1672 			if (cs->hung) {
1673 				hung_classes |= BIT(cs->engine->uabi_class);
1674 				if (!first)
1675 					first = cs;
1676 			}
1677 		}
1678 	}
1679 
1680 	len = scnprintf(error->error_msg, sizeof(error->error_msg),
1681 			"GPU HANG: ecode %d:%x:%08x",
1682 			INTEL_GEN(error->i915), hung_classes,
1683 			generate_ecode(first));
1684 	if (first && first->context.pid) {
1685 		/* Just show the first executing process, more is confusing */
1686 		len += scnprintf(error->error_msg + len,
1687 				 sizeof(error->error_msg) - len,
1688 				 ", in %s [%d]",
1689 				 first->context.comm, first->context.pid);
1690 	}
1691 
1692 	return error->error_msg;
1693 }
1694 
1695 static void capture_gen(struct i915_gpu_coredump *error)
1696 {
1697 	struct drm_i915_private *i915 = error->i915;
1698 
1699 	error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
1700 	error->suspended = i915->runtime_pm.suspended;
1701 
1702 	error->iommu = -1;
1703 #ifdef CONFIG_INTEL_IOMMU
1704 	error->iommu = intel_iommu_gfx_mapped;
1705 #endif
1706 	error->reset_count = i915_reset_count(&i915->gpu_error);
1707 	error->suspend_count = i915->suspend_count;
1708 
1709 	i915_params_copy(&error->params, &i915->params);
1710 	memcpy(&error->device_info,
1711 	       INTEL_INFO(i915),
1712 	       sizeof(error->device_info));
1713 	memcpy(&error->runtime_info,
1714 	       RUNTIME_INFO(i915),
1715 	       sizeof(error->runtime_info));
1716 	error->driver_caps = i915->caps;
1717 }
1718 
1719 struct i915_gpu_coredump *
1720 i915_gpu_coredump_alloc(struct drm_i915_private *i915, gfp_t gfp)
1721 {
1722 	struct i915_gpu_coredump *error;
1723 
1724 	if (!i915->params.error_capture)
1725 		return NULL;
1726 
1727 	error = kzalloc(sizeof(*error), gfp);
1728 	if (!error)
1729 		return NULL;
1730 
1731 	kref_init(&error->ref);
1732 	error->i915 = i915;
1733 
1734 	error->time = ktime_get_real();
1735 	error->boottime = ktime_get_boottime();
1736 	error->uptime = ktime_sub(ktime_get(), i915->gt.last_init_time);
1737 	error->capture = jiffies;
1738 
1739 	capture_gen(error);
1740 
1741 	return error;
1742 }
1743 
1744 #define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
1745 
1746 struct intel_gt_coredump *
1747 intel_gt_coredump_alloc(struct intel_gt *gt, gfp_t gfp)
1748 {
1749 	struct intel_gt_coredump *gc;
1750 
1751 	gc = kzalloc(sizeof(*gc), gfp);
1752 	if (!gc)
1753 		return NULL;
1754 
1755 	gc->_gt = gt;
1756 	gc->awake = intel_gt_pm_is_awake(gt);
1757 
1758 	gt_record_regs(gc);
1759 	gt_record_fences(gc);
1760 
1761 	return gc;
1762 }
1763 
1764 struct i915_vma_compress *
1765 i915_vma_capture_prepare(struct intel_gt_coredump *gt)
1766 {
1767 	struct i915_vma_compress *compress;
1768 
1769 	compress = kmalloc(sizeof(*compress), ALLOW_FAIL);
1770 	if (!compress)
1771 		return NULL;
1772 
1773 	if (!compress_init(compress)) {
1774 		kfree(compress);
1775 		return NULL;
1776 	}
1777 
1778 	return compress;
1779 }
1780 
1781 void i915_vma_capture_finish(struct intel_gt_coredump *gt,
1782 			     struct i915_vma_compress *compress)
1783 {
1784 	if (!compress)
1785 		return;
1786 
1787 	compress_fini(compress);
1788 	kfree(compress);
1789 }
1790 
1791 struct i915_gpu_coredump *
1792 i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask)
1793 {
1794 	struct drm_i915_private *i915 = gt->i915;
1795 	struct i915_gpu_coredump *error;
1796 
1797 	/* Check if GPU capture has been disabled */
1798 	error = READ_ONCE(i915->gpu_error.first_error);
1799 	if (IS_ERR(error))
1800 		return error;
1801 
1802 	error = i915_gpu_coredump_alloc(i915, ALLOW_FAIL);
1803 	if (!error)
1804 		return ERR_PTR(-ENOMEM);
1805 
1806 	error->gt = intel_gt_coredump_alloc(gt, ALLOW_FAIL);
1807 	if (error->gt) {
1808 		struct i915_vma_compress *compress;
1809 
1810 		compress = i915_vma_capture_prepare(error->gt);
1811 		if (!compress) {
1812 			kfree(error->gt);
1813 			kfree(error);
1814 			return ERR_PTR(-ENOMEM);
1815 		}
1816 
1817 		gt_record_info(error->gt);
1818 		gt_record_engines(error->gt, engine_mask, compress);
1819 
1820 		if (INTEL_INFO(i915)->has_gt_uc)
1821 			error->gt->uc = gt_record_uc(error->gt, compress);
1822 
1823 		i915_vma_capture_finish(error->gt, compress);
1824 
1825 		error->simulated |= error->gt->simulated;
1826 	}
1827 
1828 	error->overlay = intel_overlay_capture_error_state(i915);
1829 	error->display = intel_display_capture_error_state(i915);
1830 
1831 	return error;
1832 }
1833 
1834 void i915_error_state_store(struct i915_gpu_coredump *error)
1835 {
1836 	struct drm_i915_private *i915;
1837 	static bool warned;
1838 
1839 	if (IS_ERR_OR_NULL(error))
1840 		return;
1841 
1842 	i915 = error->i915;
1843 	drm_info(&i915->drm, "%s\n", error_msg(error));
1844 
1845 	if (error->simulated ||
1846 	    cmpxchg(&i915->gpu_error.first_error, NULL, error))
1847 		return;
1848 
1849 	i915_gpu_coredump_get(error);
1850 
1851 	if (!xchg(&warned, true) &&
1852 	    ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
1853 		pr_info("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
1854 		pr_info("Please file a _new_ bug report at https://gitlab.freedesktop.org/drm/intel/issues/new.\n");
1855 		pr_info("Please see https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs for details.\n");
1856 		pr_info("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
1857 		pr_info("The GPU crash dump is required to analyze GPU hangs, so please always attach it.\n");
1858 		pr_info("GPU crash dump saved to /sys/class/drm/card%d/error\n",
1859 			i915->drm.primary->index);
1860 	}
1861 }
1862 
1863 /**
1864  * i915_capture_error_state - capture an error record for later analysis
1865  * @gt: intel_gt which originated the hang
1866  * @engine_mask: hung engines
1867  *
1868  *
1869  * Should be called when an error is detected (either a hang or an error
1870  * interrupt) to capture error state from the time of the error.  Fills
1871  * out a structure which becomes available in debugfs for user level tools
1872  * to pick up.
1873  */
1874 void i915_capture_error_state(struct intel_gt *gt,
1875 			      intel_engine_mask_t engine_mask)
1876 {
1877 	struct i915_gpu_coredump *error;
1878 
1879 	error = i915_gpu_coredump(gt, engine_mask);
1880 	if (IS_ERR(error)) {
1881 		cmpxchg(&gt->i915->gpu_error.first_error, NULL, error);
1882 		return;
1883 	}
1884 
1885 	i915_error_state_store(error);
1886 	i915_gpu_coredump_put(error);
1887 }
1888 
1889 struct i915_gpu_coredump *
1890 i915_first_error_state(struct drm_i915_private *i915)
1891 {
1892 	struct i915_gpu_coredump *error;
1893 
1894 	spin_lock_irq(&i915->gpu_error.lock);
1895 	error = i915->gpu_error.first_error;
1896 	if (!IS_ERR_OR_NULL(error))
1897 		i915_gpu_coredump_get(error);
1898 	spin_unlock_irq(&i915->gpu_error.lock);
1899 
1900 	return error;
1901 }
1902 
1903 void i915_reset_error_state(struct drm_i915_private *i915)
1904 {
1905 	struct i915_gpu_coredump *error;
1906 
1907 	spin_lock_irq(&i915->gpu_error.lock);
1908 	error = i915->gpu_error.first_error;
1909 	if (error != ERR_PTR(-ENODEV)) /* if disabled, always disabled */
1910 		i915->gpu_error.first_error = NULL;
1911 	spin_unlock_irq(&i915->gpu_error.lock);
1912 
1913 	if (!IS_ERR_OR_NULL(error))
1914 		i915_gpu_coredump_put(error);
1915 }
1916 
1917 void i915_disable_error_state(struct drm_i915_private *i915, int err)
1918 {
1919 	spin_lock_irq(&i915->gpu_error.lock);
1920 	if (!i915->gpu_error.first_error)
1921 		i915->gpu_error.first_error = ERR_PTR(err);
1922 	spin_unlock_irq(&i915->gpu_error.lock);
1923 }
1924