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