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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Tegra host1x Job
4 *
5 * Copyright (c) 2010-2015, NVIDIA Corporation.
6 */
7
8#include <linux/dma-mapping.h>
9#include <linux/err.h>
10#include <linux/host1x.h>
11#include <linux/iommu.h>
12#include <linux/kref.h>
13#include <linux/module.h>
14#include <linux/scatterlist.h>
15#include <linux/slab.h>
16#include <linux/vmalloc.h>
17#include <trace/events/host1x.h>
18
19#include "channel.h"
20#include "dev.h"
21#include "job.h"
22#include "syncpt.h"
23
24#define HOST1X_WAIT_SYNCPT_OFFSET 0x8
25
26struct host1x_job *host1x_job_alloc(struct host1x_channel *ch,
27 u32 num_cmdbufs, u32 num_relocs,
28 bool skip_firewall)
29{
30 struct host1x_job *job = NULL;
31 unsigned int num_unpins = num_relocs;
32 bool enable_firewall;
33 u64 total;
34 void *mem;
35
36 enable_firewall = IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL) && !skip_firewall;
37
38 if (!enable_firewall)
39 num_unpins += num_cmdbufs;
40
41 /* Check that we're not going to overflow */
42 total = sizeof(struct host1x_job) +
43 (u64)num_relocs * sizeof(struct host1x_reloc) +
44 (u64)num_unpins * sizeof(struct host1x_job_unpin_data) +
45 (u64)num_cmdbufs * sizeof(struct host1x_job_cmd) +
46 (u64)num_unpins * sizeof(dma_addr_t) +
47 (u64)num_unpins * sizeof(u32 *);
48 if (total > ULONG_MAX)
49 return NULL;
50
51 mem = job = kzalloc(total, GFP_KERNEL);
52 if (!job)
53 return NULL;
54
55 job->enable_firewall = enable_firewall;
56
57 kref_init(&job->ref);
58 job->channel = ch;
59
60 /* Redistribute memory to the structs */
61 mem += sizeof(struct host1x_job);
62 job->relocs = num_relocs ? mem : NULL;
63 mem += num_relocs * sizeof(struct host1x_reloc);
64 job->unpins = num_unpins ? mem : NULL;
65 mem += num_unpins * sizeof(struct host1x_job_unpin_data);
66 job->cmds = num_cmdbufs ? mem : NULL;
67 mem += num_cmdbufs * sizeof(struct host1x_job_cmd);
68 job->addr_phys = num_unpins ? mem : NULL;
69
70 job->reloc_addr_phys = job->addr_phys;
71 job->gather_addr_phys = &job->addr_phys[num_relocs];
72
73 return job;
74}
75EXPORT_SYMBOL(host1x_job_alloc);
76
77struct host1x_job *host1x_job_get(struct host1x_job *job)
78{
79 kref_get(&job->ref);
80 return job;
81}
82EXPORT_SYMBOL(host1x_job_get);
83
84static void job_free(struct kref *ref)
85{
86 struct host1x_job *job = container_of(ref, struct host1x_job, ref);
87
88 if (job->release)
89 job->release(job);
90
91 if (job->fence) {
92 /*
93 * remove_callback is atomic w.r.t. fence signaling, so
94 * after the call returns, we know that the callback is not
95 * in execution, and the fence can be safely freed.
96 */
97 dma_fence_remove_callback(job->fence, &job->fence_cb);
98 dma_fence_put(job->fence);
99 }
100
101 if (job->syncpt)
102 host1x_syncpt_put(job->syncpt);
103
104 kfree(job);
105}
106
107void host1x_job_put(struct host1x_job *job)
108{
109 kref_put(&job->ref, job_free);
110}
111EXPORT_SYMBOL(host1x_job_put);
112
113void host1x_job_add_gather(struct host1x_job *job, struct host1x_bo *bo,
114 unsigned int words, unsigned int offset)
115{
116 struct host1x_job_gather *gather = &job->cmds[job->num_cmds].gather;
117
118 gather->words = words;
119 gather->bo = bo;
120 gather->offset = offset;
121
122 job->num_cmds++;
123}
124EXPORT_SYMBOL(host1x_job_add_gather);
125
126void host1x_job_add_wait(struct host1x_job *job, u32 id, u32 thresh,
127 bool relative, u32 next_class)
128{
129 struct host1x_job_cmd *cmd = &job->cmds[job->num_cmds];
130
131 cmd->is_wait = true;
132 cmd->wait.id = id;
133 cmd->wait.threshold = thresh;
134 cmd->wait.next_class = next_class;
135 cmd->wait.relative = relative;
136
137 job->num_cmds++;
138}
139EXPORT_SYMBOL(host1x_job_add_wait);
140
141static int pin_job(struct host1x *host, struct host1x_job *job)
142{
143 unsigned long mask = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;
144 struct host1x_client *client = job->client;
145 struct device *dev = client->dev;
146 struct host1x_job_gather *g;
147 unsigned int i;
148 int err;
149
150 job->num_unpins = 0;
151
152 for (i = 0; i < job->num_relocs; i++) {
153 struct host1x_reloc *reloc = &job->relocs[i];
154 enum dma_data_direction direction;
155 struct host1x_bo_mapping *map;
156 struct host1x_bo *bo;
157
158 reloc->target.bo = host1x_bo_get(reloc->target.bo);
159 if (!reloc->target.bo) {
160 err = -EINVAL;
161 goto unpin;
162 }
163
164 bo = reloc->target.bo;
165
166 switch (reloc->flags & mask) {
167 case HOST1X_RELOC_READ:
168 direction = DMA_TO_DEVICE;
169 break;
170
171 case HOST1X_RELOC_WRITE:
172 direction = DMA_FROM_DEVICE;
173 break;
174
175 case HOST1X_RELOC_READ | HOST1X_RELOC_WRITE:
176 direction = DMA_BIDIRECTIONAL;
177 break;
178
179 default:
180 err = -EINVAL;
181 goto unpin;
182 }
183
184 map = host1x_bo_pin(dev, bo, direction, NULL);
185 if (IS_ERR(map)) {
186 err = PTR_ERR(map);
187 goto unpin;
188 }
189
190 /*
191 * host1x clients are generally not able to do scatter-gather themselves, so fail
192 * if the buffer is discontiguous and we fail to map its SG table to a single
193 * contiguous chunk of I/O virtual memory.
194 */
195 if (map->chunks > 1) {
196 err = -EINVAL;
197 goto unpin;
198 }
199
200 job->addr_phys[job->num_unpins] = map->phys;
201 job->unpins[job->num_unpins].map = map;
202 job->num_unpins++;
203 }
204
205 /*
206 * We will copy gathers BO content later, so there is no need to
207 * hold and pin them.
208 */
209 if (job->enable_firewall)
210 return 0;
211
212 for (i = 0; i < job->num_cmds; i++) {
213 struct host1x_bo_mapping *map;
214 size_t gather_size = 0;
215 struct scatterlist *sg;
216 unsigned long shift;
217 struct iova *alloc;
218 unsigned int j;
219
220 if (job->cmds[i].is_wait)
221 continue;
222
223 g = &job->cmds[i].gather;
224
225 g->bo = host1x_bo_get(g->bo);
226 if (!g->bo) {
227 err = -EINVAL;
228 goto unpin;
229 }
230
231 map = host1x_bo_pin(host->dev, g->bo, DMA_TO_DEVICE, NULL);
232 if (IS_ERR(map)) {
233 err = PTR_ERR(map);
234 goto unpin;
235 }
236
237 if (host->domain) {
238 ssize_t map_err;
239
240 for_each_sgtable_sg(map->sgt, sg, j)
241 gather_size += sg->length;
242
243 gather_size = iova_align(&host->iova, gather_size);
244
245 shift = iova_shift(&host->iova);
246 alloc = alloc_iova(&host->iova, gather_size >> shift,
247 host->iova_end >> shift, true);
248 if (!alloc) {
249 err = -ENOMEM;
250 goto put;
251 }
252
253 map_err = iommu_map_sgtable(host->domain, iova_dma_addr(&host->iova, alloc),
254 map->sgt, IOMMU_READ);
255 if (map_err < 0) {
256 __free_iova(&host->iova, alloc);
257 err = map_err;
258 goto put;
259 }
260
261 map->phys = iova_dma_addr(&host->iova, alloc);
262 map->size = gather_size;
263 }
264
265 job->addr_phys[job->num_unpins] = map->phys;
266 job->unpins[job->num_unpins].map = map;
267 job->num_unpins++;
268
269 job->gather_addr_phys[i] = map->phys;
270 }
271
272 return 0;
273
274put:
275 host1x_bo_put(g->bo);
276unpin:
277 host1x_job_unpin(job);
278 return err;
279}
280
281static int do_relocs(struct host1x_job *job, struct host1x_job_gather *g)
282{
283 void *cmdbuf_addr = NULL;
284 struct host1x_bo *cmdbuf = g->bo;
285 unsigned int i;
286
287 /* pin & patch the relocs for one gather */
288 for (i = 0; i < job->num_relocs; i++) {
289 struct host1x_reloc *reloc = &job->relocs[i];
290 u32 reloc_addr = (job->reloc_addr_phys[i] +
291 reloc->target.offset) >> reloc->shift;
292 u32 *target;
293
294 /* skip all other gathers */
295 if (cmdbuf != reloc->cmdbuf.bo)
296 continue;
297
298 if (job->enable_firewall) {
299 target = (u32 *)job->gather_copy_mapped +
300 reloc->cmdbuf.offset / sizeof(u32) +
301 g->offset / sizeof(u32);
302 goto patch_reloc;
303 }
304
305 if (!cmdbuf_addr) {
306 cmdbuf_addr = host1x_bo_mmap(cmdbuf);
307
308 if (unlikely(!cmdbuf_addr)) {
309 pr_err("Could not map cmdbuf for relocation\n");
310 return -ENOMEM;
311 }
312 }
313
314 target = cmdbuf_addr + reloc->cmdbuf.offset;
315patch_reloc:
316 *target = reloc_addr;
317 }
318
319 if (cmdbuf_addr)
320 host1x_bo_munmap(cmdbuf, cmdbuf_addr);
321
322 return 0;
323}
324
325static bool check_reloc(struct host1x_reloc *reloc, struct host1x_bo *cmdbuf,
326 unsigned int offset)
327{
328 offset *= sizeof(u32);
329
330 if (reloc->cmdbuf.bo != cmdbuf || reloc->cmdbuf.offset != offset)
331 return false;
332
333 /* relocation shift value validation isn't implemented yet */
334 if (reloc->shift)
335 return false;
336
337 return true;
338}
339
340struct host1x_firewall {
341 struct host1x_job *job;
342 struct device *dev;
343
344 unsigned int num_relocs;
345 struct host1x_reloc *reloc;
346
347 struct host1x_bo *cmdbuf;
348 unsigned int offset;
349
350 u32 words;
351 u32 class;
352 u32 reg;
353 u32 mask;
354 u32 count;
355};
356
357static int check_register(struct host1x_firewall *fw, unsigned long offset)
358{
359 if (!fw->job->is_addr_reg)
360 return 0;
361
362 if (fw->job->is_addr_reg(fw->dev, fw->class, offset)) {
363 if (!fw->num_relocs)
364 return -EINVAL;
365
366 if (!check_reloc(fw->reloc, fw->cmdbuf, fw->offset))
367 return -EINVAL;
368
369 fw->num_relocs--;
370 fw->reloc++;
371 }
372
373 return 0;
374}
375
376static int check_class(struct host1x_firewall *fw, u32 class)
377{
378 if (!fw->job->is_valid_class) {
379 if (fw->class != class)
380 return -EINVAL;
381 } else {
382 if (!fw->job->is_valid_class(fw->class))
383 return -EINVAL;
384 }
385
386 return 0;
387}
388
389static int check_mask(struct host1x_firewall *fw)
390{
391 u32 mask = fw->mask;
392 u32 reg = fw->reg;
393 int ret;
394
395 while (mask) {
396 if (fw->words == 0)
397 return -EINVAL;
398
399 if (mask & 1) {
400 ret = check_register(fw, reg);
401 if (ret < 0)
402 return ret;
403
404 fw->words--;
405 fw->offset++;
406 }
407 mask >>= 1;
408 reg++;
409 }
410
411 return 0;
412}
413
414static int check_incr(struct host1x_firewall *fw)
415{
416 u32 count = fw->count;
417 u32 reg = fw->reg;
418 int ret;
419
420 while (count) {
421 if (fw->words == 0)
422 return -EINVAL;
423
424 ret = check_register(fw, reg);
425 if (ret < 0)
426 return ret;
427
428 reg++;
429 fw->words--;
430 fw->offset++;
431 count--;
432 }
433
434 return 0;
435}
436
437static int check_nonincr(struct host1x_firewall *fw)
438{
439 u32 count = fw->count;
440 int ret;
441
442 while (count) {
443 if (fw->words == 0)
444 return -EINVAL;
445
446 ret = check_register(fw, fw->reg);
447 if (ret < 0)
448 return ret;
449
450 fw->words--;
451 fw->offset++;
452 count--;
453 }
454
455 return 0;
456}
457
458static int validate(struct host1x_firewall *fw, struct host1x_job_gather *g)
459{
460 u32 *cmdbuf_base = (u32 *)fw->job->gather_copy_mapped +
461 (g->offset / sizeof(u32));
462 u32 job_class = fw->class;
463 int err = 0;
464
465 fw->words = g->words;
466 fw->cmdbuf = g->bo;
467 fw->offset = 0;
468
469 while (fw->words && !err) {
470 u32 word = cmdbuf_base[fw->offset];
471 u32 opcode = (word & 0xf0000000) >> 28;
472
473 fw->mask = 0;
474 fw->reg = 0;
475 fw->count = 0;
476 fw->words--;
477 fw->offset++;
478
479 switch (opcode) {
480 case 0:
481 fw->class = word >> 6 & 0x3ff;
482 fw->mask = word & 0x3f;
483 fw->reg = word >> 16 & 0xfff;
484 err = check_class(fw, job_class);
485 if (!err)
486 err = check_mask(fw);
487 if (err)
488 goto out;
489 break;
490 case 1:
491 fw->reg = word >> 16 & 0xfff;
492 fw->count = word & 0xffff;
493 err = check_incr(fw);
494 if (err)
495 goto out;
496 break;
497
498 case 2:
499 fw->reg = word >> 16 & 0xfff;
500 fw->count = word & 0xffff;
501 err = check_nonincr(fw);
502 if (err)
503 goto out;
504 break;
505
506 case 3:
507 fw->mask = word & 0xffff;
508 fw->reg = word >> 16 & 0xfff;
509 err = check_mask(fw);
510 if (err)
511 goto out;
512 break;
513 case 4:
514 case 14:
515 break;
516 default:
517 err = -EINVAL;
518 break;
519 }
520 }
521
522out:
523 return err;
524}
525
526static inline int copy_gathers(struct device *host, struct host1x_job *job,
527 struct device *dev)
528{
529 struct host1x_firewall fw;
530 size_t size = 0;
531 size_t offset = 0;
532 unsigned int i;
533
534 fw.job = job;
535 fw.dev = dev;
536 fw.reloc = job->relocs;
537 fw.num_relocs = job->num_relocs;
538 fw.class = job->class;
539
540 for (i = 0; i < job->num_cmds; i++) {
541 struct host1x_job_gather *g;
542
543 if (job->cmds[i].is_wait)
544 continue;
545
546 g = &job->cmds[i].gather;
547
548 size += g->words * sizeof(u32);
549 }
550
551 /*
552 * Try a non-blocking allocation from a higher priority pools first,
553 * as awaiting for the allocation here is a major performance hit.
554 */
555 job->gather_copy_mapped = dma_alloc_wc(host, size, &job->gather_copy,
556 GFP_NOWAIT);
557
558 /* the higher priority allocation failed, try the generic-blocking */
559 if (!job->gather_copy_mapped)
560 job->gather_copy_mapped = dma_alloc_wc(host, size,
561 &job->gather_copy,
562 GFP_KERNEL);
563 if (!job->gather_copy_mapped)
564 return -ENOMEM;
565
566 job->gather_copy_size = size;
567
568 for (i = 0; i < job->num_cmds; i++) {
569 struct host1x_job_gather *g;
570 void *gather;
571
572 if (job->cmds[i].is_wait)
573 continue;
574 g = &job->cmds[i].gather;
575
576 /* Copy the gather */
577 gather = host1x_bo_mmap(g->bo);
578 memcpy(job->gather_copy_mapped + offset, gather + g->offset,
579 g->words * sizeof(u32));
580 host1x_bo_munmap(g->bo, gather);
581
582 /* Store the location in the buffer */
583 g->base = job->gather_copy;
584 g->offset = offset;
585
586 /* Validate the job */
587 if (validate(&fw, g))
588 return -EINVAL;
589
590 offset += g->words * sizeof(u32);
591 }
592
593 /* No relocs should remain at this point */
594 if (fw.num_relocs)
595 return -EINVAL;
596
597 return 0;
598}
599
600int host1x_job_pin(struct host1x_job *job, struct device *dev)
601{
602 int err;
603 unsigned int i, j;
604 struct host1x *host = dev_get_drvdata(dev->parent);
605
606 /* pin memory */
607 err = pin_job(host, job);
608 if (err)
609 goto out;
610
611 if (job->enable_firewall) {
612 err = copy_gathers(host->dev, job, dev);
613 if (err)
614 goto out;
615 }
616
617 /* patch gathers */
618 for (i = 0; i < job->num_cmds; i++) {
619 struct host1x_job_gather *g;
620
621 if (job->cmds[i].is_wait)
622 continue;
623 g = &job->cmds[i].gather;
624
625 /* process each gather mem only once */
626 if (g->handled)
627 continue;
628
629 /* copy_gathers() sets gathers base if firewall is enabled */
630 if (!job->enable_firewall)
631 g->base = job->gather_addr_phys[i];
632
633 for (j = i + 1; j < job->num_cmds; j++) {
634 if (!job->cmds[j].is_wait &&
635 job->cmds[j].gather.bo == g->bo) {
636 job->cmds[j].gather.handled = true;
637 job->cmds[j].gather.base = g->base;
638 }
639 }
640
641 err = do_relocs(job, g);
642 if (err)
643 break;
644 }
645
646out:
647 if (err)
648 host1x_job_unpin(job);
649 wmb();
650
651 return err;
652}
653EXPORT_SYMBOL(host1x_job_pin);
654
655void host1x_job_unpin(struct host1x_job *job)
656{
657 struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
658 unsigned int i;
659
660 for (i = 0; i < job->num_unpins; i++) {
661 struct host1x_bo_mapping *map = job->unpins[i].map;
662 struct host1x_bo *bo = map->bo;
663
664 if (!job->enable_firewall && map->size && host->domain) {
665 iommu_unmap(host->domain, job->addr_phys[i], map->size);
666 free_iova(&host->iova, iova_pfn(&host->iova, job->addr_phys[i]));
667 }
668
669 host1x_bo_unpin(map);
670 host1x_bo_put(bo);
671 }
672
673 job->num_unpins = 0;
674
675 if (job->gather_copy_size)
676 dma_free_wc(host->dev, job->gather_copy_size,
677 job->gather_copy_mapped, job->gather_copy);
678}
679EXPORT_SYMBOL(host1x_job_unpin);
680
681/*
682 * Debug routine used to dump job entries
683 */
684void host1x_job_dump(struct device *dev, struct host1x_job *job)
685{
686 dev_dbg(dev, " SYNCPT_ID %d\n", job->syncpt->id);
687 dev_dbg(dev, " SYNCPT_VAL %d\n", job->syncpt_end);
688 dev_dbg(dev, " FIRST_GET 0x%x\n", job->first_get);
689 dev_dbg(dev, " TIMEOUT %d\n", job->timeout);
690 dev_dbg(dev, " NUM_SLOTS %d\n", job->num_slots);
691 dev_dbg(dev, " NUM_HANDLES %d\n", job->num_unpins);
692}