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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->waiter)
92 host1x_intr_put_ref(job->syncpt->host, job->syncpt->id,
93 job->waiter, false);
94
95 if (job->syncpt)
96 host1x_syncpt_put(job->syncpt);
97
98 kfree(job);
99}
100
101void host1x_job_put(struct host1x_job *job)
102{
103 kref_put(&job->ref, job_free);
104}
105EXPORT_SYMBOL(host1x_job_put);
106
107void host1x_job_add_gather(struct host1x_job *job, struct host1x_bo *bo,
108 unsigned int words, unsigned int offset)
109{
110 struct host1x_job_gather *gather = &job->cmds[job->num_cmds].gather;
111
112 gather->words = words;
113 gather->bo = bo;
114 gather->offset = offset;
115
116 job->num_cmds++;
117}
118EXPORT_SYMBOL(host1x_job_add_gather);
119
120void host1x_job_add_wait(struct host1x_job *job, u32 id, u32 thresh,
121 bool relative, u32 next_class)
122{
123 struct host1x_job_cmd *cmd = &job->cmds[job->num_cmds];
124
125 cmd->is_wait = true;
126 cmd->wait.id = id;
127 cmd->wait.threshold = thresh;
128 cmd->wait.next_class = next_class;
129 cmd->wait.relative = relative;
130
131 job->num_cmds++;
132}
133EXPORT_SYMBOL(host1x_job_add_wait);
134
135static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
136{
137 unsigned long mask = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;
138 struct host1x_client *client = job->client;
139 struct device *dev = client->dev;
140 struct host1x_job_gather *g;
141 unsigned int i;
142 int err;
143
144 job->num_unpins = 0;
145
146 for (i = 0; i < job->num_relocs; i++) {
147 struct host1x_reloc *reloc = &job->relocs[i];
148 enum dma_data_direction direction;
149 struct host1x_bo_mapping *map;
150 struct host1x_bo *bo;
151
152 reloc->target.bo = host1x_bo_get(reloc->target.bo);
153 if (!reloc->target.bo) {
154 err = -EINVAL;
155 goto unpin;
156 }
157
158 bo = reloc->target.bo;
159
160 switch (reloc->flags & mask) {
161 case HOST1X_RELOC_READ:
162 direction = DMA_TO_DEVICE;
163 break;
164
165 case HOST1X_RELOC_WRITE:
166 direction = DMA_FROM_DEVICE;
167 break;
168
169 case HOST1X_RELOC_READ | HOST1X_RELOC_WRITE:
170 direction = DMA_BIDIRECTIONAL;
171 break;
172
173 default:
174 err = -EINVAL;
175 goto unpin;
176 }
177
178 map = host1x_bo_pin(dev, bo, direction, NULL);
179 if (IS_ERR(map)) {
180 err = PTR_ERR(map);
181 goto unpin;
182 }
183
184 /*
185 * host1x clients are generally not able to do scatter-gather themselves, so fail
186 * if the buffer is discontiguous and we fail to map its SG table to a single
187 * contiguous chunk of I/O virtual memory.
188 */
189 if (map->chunks > 1) {
190 err = -EINVAL;
191 goto unpin;
192 }
193
194 job->addr_phys[job->num_unpins] = map->phys;
195 job->unpins[job->num_unpins].map = map;
196 job->num_unpins++;
197 }
198
199 /*
200 * We will copy gathers BO content later, so there is no need to
201 * hold and pin them.
202 */
203 if (job->enable_firewall)
204 return 0;
205
206 for (i = 0; i < job->num_cmds; i++) {
207 struct host1x_bo_mapping *map;
208 size_t gather_size = 0;
209 struct scatterlist *sg;
210 unsigned long shift;
211 struct iova *alloc;
212 unsigned int j;
213
214 if (job->cmds[i].is_wait)
215 continue;
216
217 g = &job->cmds[i].gather;
218
219 g->bo = host1x_bo_get(g->bo);
220 if (!g->bo) {
221 err = -EINVAL;
222 goto unpin;
223 }
224
225 map = host1x_bo_pin(host->dev, g->bo, DMA_TO_DEVICE, NULL);
226 if (IS_ERR(map)) {
227 err = PTR_ERR(map);
228 goto unpin;
229 }
230
231 if (host->domain) {
232 for_each_sgtable_sg(map->sgt, sg, j)
233 gather_size += sg->length;
234
235 gather_size = iova_align(&host->iova, gather_size);
236
237 shift = iova_shift(&host->iova);
238 alloc = alloc_iova(&host->iova, gather_size >> shift,
239 host->iova_end >> shift, true);
240 if (!alloc) {
241 err = -ENOMEM;
242 goto put;
243 }
244
245 err = iommu_map_sgtable(host->domain, iova_dma_addr(&host->iova, alloc),
246 map->sgt, IOMMU_READ);
247 if (err == 0) {
248 __free_iova(&host->iova, alloc);
249 err = -EINVAL;
250 goto put;
251 }
252
253 map->phys = iova_dma_addr(&host->iova, alloc);
254 map->size = gather_size;
255 }
256
257 job->addr_phys[job->num_unpins] = map->phys;
258 job->unpins[job->num_unpins].map = map;
259 job->num_unpins++;
260
261 job->gather_addr_phys[i] = map->phys;
262 }
263
264 return 0;
265
266put:
267 host1x_bo_put(g->bo);
268unpin:
269 host1x_job_unpin(job);
270 return err;
271}
272
273static int do_relocs(struct host1x_job *job, struct host1x_job_gather *g)
274{
275 void *cmdbuf_addr = NULL;
276 struct host1x_bo *cmdbuf = g->bo;
277 unsigned int i;
278
279 /* pin & patch the relocs for one gather */
280 for (i = 0; i < job->num_relocs; i++) {
281 struct host1x_reloc *reloc = &job->relocs[i];
282 u32 reloc_addr = (job->reloc_addr_phys[i] +
283 reloc->target.offset) >> reloc->shift;
284 u32 *target;
285
286 /* skip all other gathers */
287 if (cmdbuf != reloc->cmdbuf.bo)
288 continue;
289
290 if (job->enable_firewall) {
291 target = (u32 *)job->gather_copy_mapped +
292 reloc->cmdbuf.offset / sizeof(u32) +
293 g->offset / sizeof(u32);
294 goto patch_reloc;
295 }
296
297 if (!cmdbuf_addr) {
298 cmdbuf_addr = host1x_bo_mmap(cmdbuf);
299
300 if (unlikely(!cmdbuf_addr)) {
301 pr_err("Could not map cmdbuf for relocation\n");
302 return -ENOMEM;
303 }
304 }
305
306 target = cmdbuf_addr + reloc->cmdbuf.offset;
307patch_reloc:
308 *target = reloc_addr;
309 }
310
311 if (cmdbuf_addr)
312 host1x_bo_munmap(cmdbuf, cmdbuf_addr);
313
314 return 0;
315}
316
317static bool check_reloc(struct host1x_reloc *reloc, struct host1x_bo *cmdbuf,
318 unsigned int offset)
319{
320 offset *= sizeof(u32);
321
322 if (reloc->cmdbuf.bo != cmdbuf || reloc->cmdbuf.offset != offset)
323 return false;
324
325 /* relocation shift value validation isn't implemented yet */
326 if (reloc->shift)
327 return false;
328
329 return true;
330}
331
332struct host1x_firewall {
333 struct host1x_job *job;
334 struct device *dev;
335
336 unsigned int num_relocs;
337 struct host1x_reloc *reloc;
338
339 struct host1x_bo *cmdbuf;
340 unsigned int offset;
341
342 u32 words;
343 u32 class;
344 u32 reg;
345 u32 mask;
346 u32 count;
347};
348
349static int check_register(struct host1x_firewall *fw, unsigned long offset)
350{
351 if (!fw->job->is_addr_reg)
352 return 0;
353
354 if (fw->job->is_addr_reg(fw->dev, fw->class, offset)) {
355 if (!fw->num_relocs)
356 return -EINVAL;
357
358 if (!check_reloc(fw->reloc, fw->cmdbuf, fw->offset))
359 return -EINVAL;
360
361 fw->num_relocs--;
362 fw->reloc++;
363 }
364
365 return 0;
366}
367
368static int check_class(struct host1x_firewall *fw, u32 class)
369{
370 if (!fw->job->is_valid_class) {
371 if (fw->class != class)
372 return -EINVAL;
373 } else {
374 if (!fw->job->is_valid_class(fw->class))
375 return -EINVAL;
376 }
377
378 return 0;
379}
380
381static int check_mask(struct host1x_firewall *fw)
382{
383 u32 mask = fw->mask;
384 u32 reg = fw->reg;
385 int ret;
386
387 while (mask) {
388 if (fw->words == 0)
389 return -EINVAL;
390
391 if (mask & 1) {
392 ret = check_register(fw, reg);
393 if (ret < 0)
394 return ret;
395
396 fw->words--;
397 fw->offset++;
398 }
399 mask >>= 1;
400 reg++;
401 }
402
403 return 0;
404}
405
406static int check_incr(struct host1x_firewall *fw)
407{
408 u32 count = fw->count;
409 u32 reg = fw->reg;
410 int ret;
411
412 while (count) {
413 if (fw->words == 0)
414 return -EINVAL;
415
416 ret = check_register(fw, reg);
417 if (ret < 0)
418 return ret;
419
420 reg++;
421 fw->words--;
422 fw->offset++;
423 count--;
424 }
425
426 return 0;
427}
428
429static int check_nonincr(struct host1x_firewall *fw)
430{
431 u32 count = fw->count;
432 int ret;
433
434 while (count) {
435 if (fw->words == 0)
436 return -EINVAL;
437
438 ret = check_register(fw, fw->reg);
439 if (ret < 0)
440 return ret;
441
442 fw->words--;
443 fw->offset++;
444 count--;
445 }
446
447 return 0;
448}
449
450static int validate(struct host1x_firewall *fw, struct host1x_job_gather *g)
451{
452 u32 *cmdbuf_base = (u32 *)fw->job->gather_copy_mapped +
453 (g->offset / sizeof(u32));
454 u32 job_class = fw->class;
455 int err = 0;
456
457 fw->words = g->words;
458 fw->cmdbuf = g->bo;
459 fw->offset = 0;
460
461 while (fw->words && !err) {
462 u32 word = cmdbuf_base[fw->offset];
463 u32 opcode = (word & 0xf0000000) >> 28;
464
465 fw->mask = 0;
466 fw->reg = 0;
467 fw->count = 0;
468 fw->words--;
469 fw->offset++;
470
471 switch (opcode) {
472 case 0:
473 fw->class = word >> 6 & 0x3ff;
474 fw->mask = word & 0x3f;
475 fw->reg = word >> 16 & 0xfff;
476 err = check_class(fw, job_class);
477 if (!err)
478 err = check_mask(fw);
479 if (err)
480 goto out;
481 break;
482 case 1:
483 fw->reg = word >> 16 & 0xfff;
484 fw->count = word & 0xffff;
485 err = check_incr(fw);
486 if (err)
487 goto out;
488 break;
489
490 case 2:
491 fw->reg = word >> 16 & 0xfff;
492 fw->count = word & 0xffff;
493 err = check_nonincr(fw);
494 if (err)
495 goto out;
496 break;
497
498 case 3:
499 fw->mask = word & 0xffff;
500 fw->reg = word >> 16 & 0xfff;
501 err = check_mask(fw);
502 if (err)
503 goto out;
504 break;
505 case 4:
506 case 14:
507 break;
508 default:
509 err = -EINVAL;
510 break;
511 }
512 }
513
514out:
515 return err;
516}
517
518static inline int copy_gathers(struct device *host, struct host1x_job *job,
519 struct device *dev)
520{
521 struct host1x_firewall fw;
522 size_t size = 0;
523 size_t offset = 0;
524 unsigned int i;
525
526 fw.job = job;
527 fw.dev = dev;
528 fw.reloc = job->relocs;
529 fw.num_relocs = job->num_relocs;
530 fw.class = job->class;
531
532 for (i = 0; i < job->num_cmds; i++) {
533 struct host1x_job_gather *g;
534
535 if (job->cmds[i].is_wait)
536 continue;
537
538 g = &job->cmds[i].gather;
539
540 size += g->words * sizeof(u32);
541 }
542
543 /*
544 * Try a non-blocking allocation from a higher priority pools first,
545 * as awaiting for the allocation here is a major performance hit.
546 */
547 job->gather_copy_mapped = dma_alloc_wc(host, size, &job->gather_copy,
548 GFP_NOWAIT);
549
550 /* the higher priority allocation failed, try the generic-blocking */
551 if (!job->gather_copy_mapped)
552 job->gather_copy_mapped = dma_alloc_wc(host, size,
553 &job->gather_copy,
554 GFP_KERNEL);
555 if (!job->gather_copy_mapped)
556 return -ENOMEM;
557
558 job->gather_copy_size = size;
559
560 for (i = 0; i < job->num_cmds; i++) {
561 struct host1x_job_gather *g;
562 void *gather;
563
564 if (job->cmds[i].is_wait)
565 continue;
566 g = &job->cmds[i].gather;
567
568 /* Copy the gather */
569 gather = host1x_bo_mmap(g->bo);
570 memcpy(job->gather_copy_mapped + offset, gather + g->offset,
571 g->words * sizeof(u32));
572 host1x_bo_munmap(g->bo, gather);
573
574 /* Store the location in the buffer */
575 g->base = job->gather_copy;
576 g->offset = offset;
577
578 /* Validate the job */
579 if (validate(&fw, g))
580 return -EINVAL;
581
582 offset += g->words * sizeof(u32);
583 }
584
585 /* No relocs should remain at this point */
586 if (fw.num_relocs)
587 return -EINVAL;
588
589 return 0;
590}
591
592int host1x_job_pin(struct host1x_job *job, struct device *dev)
593{
594 int err;
595 unsigned int i, j;
596 struct host1x *host = dev_get_drvdata(dev->parent);
597
598 /* pin memory */
599 err = pin_job(host, job);
600 if (err)
601 goto out;
602
603 if (job->enable_firewall) {
604 err = copy_gathers(host->dev, job, dev);
605 if (err)
606 goto out;
607 }
608
609 /* patch gathers */
610 for (i = 0; i < job->num_cmds; i++) {
611 struct host1x_job_gather *g;
612
613 if (job->cmds[i].is_wait)
614 continue;
615 g = &job->cmds[i].gather;
616
617 /* process each gather mem only once */
618 if (g->handled)
619 continue;
620
621 /* copy_gathers() sets gathers base if firewall is enabled */
622 if (!job->enable_firewall)
623 g->base = job->gather_addr_phys[i];
624
625 for (j = i + 1; j < job->num_cmds; j++) {
626 if (!job->cmds[j].is_wait &&
627 job->cmds[j].gather.bo == g->bo) {
628 job->cmds[j].gather.handled = true;
629 job->cmds[j].gather.base = g->base;
630 }
631 }
632
633 err = do_relocs(job, g);
634 if (err)
635 break;
636 }
637
638out:
639 if (err)
640 host1x_job_unpin(job);
641 wmb();
642
643 return err;
644}
645EXPORT_SYMBOL(host1x_job_pin);
646
647void host1x_job_unpin(struct host1x_job *job)
648{
649 struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
650 unsigned int i;
651
652 for (i = 0; i < job->num_unpins; i++) {
653 struct host1x_bo_mapping *map = job->unpins[i].map;
654 struct host1x_bo *bo = map->bo;
655
656 if (!job->enable_firewall && map->size && host->domain) {
657 iommu_unmap(host->domain, job->addr_phys[i], map->size);
658 free_iova(&host->iova, iova_pfn(&host->iova, job->addr_phys[i]));
659 }
660
661 host1x_bo_unpin(map);
662 host1x_bo_put(bo);
663 }
664
665 job->num_unpins = 0;
666
667 if (job->gather_copy_size)
668 dma_free_wc(host->dev, job->gather_copy_size,
669 job->gather_copy_mapped, job->gather_copy);
670}
671EXPORT_SYMBOL(host1x_job_unpin);
672
673/*
674 * Debug routine used to dump job entries
675 */
676void host1x_job_dump(struct device *dev, struct host1x_job *job)
677{
678 dev_dbg(dev, " SYNCPT_ID %d\n", job->syncpt->id);
679 dev_dbg(dev, " SYNCPT_VAL %d\n", job->syncpt_end);
680 dev_dbg(dev, " FIRST_GET 0x%x\n", job->first_get);
681 dev_dbg(dev, " TIMEOUT %d\n", job->timeout);
682 dev_dbg(dev, " NUM_SLOTS %d\n", job->num_slots);
683 dev_dbg(dev, " NUM_HANDLES %d\n", job->num_unpins);
684}