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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
4 * Author:Mark Yao <mark.yao@rock-chips.com>
5 */
6
7#include <linux/dma-buf.h>
8#include <linux/iommu.h>
9#include <linux/vmalloc.h>
10
11#include <drm/drm.h>
12#include <drm/drm_gem.h>
13#include <drm/drm_gem_cma_helper.h>
14#include <drm/drm_prime.h>
15#include <drm/drm_vma_manager.h>
16
17#include "rockchip_drm_drv.h"
18#include "rockchip_drm_gem.h"
19
20static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)
21{
22 struct drm_device *drm = rk_obj->base.dev;
23 struct rockchip_drm_private *private = drm->dev_private;
24 int prot = IOMMU_READ | IOMMU_WRITE;
25 ssize_t ret;
26
27 mutex_lock(&private->mm_lock);
28 ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,
29 rk_obj->base.size, PAGE_SIZE,
30 0, 0);
31 mutex_unlock(&private->mm_lock);
32
33 if (ret < 0) {
34 DRM_ERROR("out of I/O virtual memory: %zd\n", ret);
35 return ret;
36 }
37
38 rk_obj->dma_addr = rk_obj->mm.start;
39
40 ret = iommu_map_sgtable(private->domain, rk_obj->dma_addr, rk_obj->sgt,
41 prot);
42 if (ret < rk_obj->base.size) {
43 DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",
44 ret, rk_obj->base.size);
45 ret = -ENOMEM;
46 goto err_remove_node;
47 }
48
49 rk_obj->size = ret;
50
51 return 0;
52
53err_remove_node:
54 mutex_lock(&private->mm_lock);
55 drm_mm_remove_node(&rk_obj->mm);
56 mutex_unlock(&private->mm_lock);
57
58 return ret;
59}
60
61static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)
62{
63 struct drm_device *drm = rk_obj->base.dev;
64 struct rockchip_drm_private *private = drm->dev_private;
65
66 iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);
67
68 mutex_lock(&private->mm_lock);
69
70 drm_mm_remove_node(&rk_obj->mm);
71
72 mutex_unlock(&private->mm_lock);
73
74 return 0;
75}
76
77static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)
78{
79 struct drm_device *drm = rk_obj->base.dev;
80 int ret, i;
81 struct scatterlist *s;
82
83 rk_obj->pages = drm_gem_get_pages(&rk_obj->base);
84 if (IS_ERR(rk_obj->pages))
85 return PTR_ERR(rk_obj->pages);
86
87 rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;
88
89 rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->base.dev,
90 rk_obj->pages, rk_obj->num_pages);
91 if (IS_ERR(rk_obj->sgt)) {
92 ret = PTR_ERR(rk_obj->sgt);
93 goto err_put_pages;
94 }
95
96 /*
97 * Fake up the SG table so that dma_sync_sg_for_device() can be used
98 * to flush the pages associated with it.
99 *
100 * TODO: Replace this by drm_clflush_sg() once it can be implemented
101 * without relying on symbols that are not exported.
102 */
103 for_each_sgtable_sg(rk_obj->sgt, s, i)
104 sg_dma_address(s) = sg_phys(s);
105
106 dma_sync_sgtable_for_device(drm->dev, rk_obj->sgt, DMA_TO_DEVICE);
107
108 return 0;
109
110err_put_pages:
111 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);
112 return ret;
113}
114
115static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)
116{
117 sg_free_table(rk_obj->sgt);
118 kfree(rk_obj->sgt);
119 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);
120}
121
122static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,
123 bool alloc_kmap)
124{
125 int ret;
126
127 ret = rockchip_gem_get_pages(rk_obj);
128 if (ret < 0)
129 return ret;
130
131 ret = rockchip_gem_iommu_map(rk_obj);
132 if (ret < 0)
133 goto err_free;
134
135 if (alloc_kmap) {
136 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
137 pgprot_writecombine(PAGE_KERNEL));
138 if (!rk_obj->kvaddr) {
139 DRM_ERROR("failed to vmap() buffer\n");
140 ret = -ENOMEM;
141 goto err_unmap;
142 }
143 }
144
145 return 0;
146
147err_unmap:
148 rockchip_gem_iommu_unmap(rk_obj);
149err_free:
150 rockchip_gem_put_pages(rk_obj);
151
152 return ret;
153}
154
155static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,
156 bool alloc_kmap)
157{
158 struct drm_gem_object *obj = &rk_obj->base;
159 struct drm_device *drm = obj->dev;
160
161 rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;
162
163 if (!alloc_kmap)
164 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
165
166 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,
167 &rk_obj->dma_addr, GFP_KERNEL,
168 rk_obj->dma_attrs);
169 if (!rk_obj->kvaddr) {
170 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);
171 return -ENOMEM;
172 }
173
174 return 0;
175}
176
177static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
178 bool alloc_kmap)
179{
180 struct drm_gem_object *obj = &rk_obj->base;
181 struct drm_device *drm = obj->dev;
182 struct rockchip_drm_private *private = drm->dev_private;
183
184 if (private->domain)
185 return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
186 else
187 return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);
188}
189
190static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)
191{
192 vunmap(rk_obj->kvaddr);
193 rockchip_gem_iommu_unmap(rk_obj);
194 rockchip_gem_put_pages(rk_obj);
195}
196
197static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
198{
199 struct drm_gem_object *obj = &rk_obj->base;
200 struct drm_device *drm = obj->dev;
201
202 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,
203 rk_obj->dma_attrs);
204}
205
206static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
207{
208 if (rk_obj->pages)
209 rockchip_gem_free_iommu(rk_obj);
210 else
211 rockchip_gem_free_dma(rk_obj);
212}
213
214static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
215 struct vm_area_struct *vma)
216{
217 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
218 unsigned int count = obj->size >> PAGE_SHIFT;
219 unsigned long user_count = vma_pages(vma);
220
221 if (user_count == 0)
222 return -ENXIO;
223
224 return vm_map_pages(vma, rk_obj->pages, count);
225}
226
227static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,
228 struct vm_area_struct *vma)
229{
230 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
231 struct drm_device *drm = obj->dev;
232
233 return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
234 obj->size, rk_obj->dma_attrs);
235}
236
237static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
238 struct vm_area_struct *vma)
239{
240 int ret;
241 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
242
243 /*
244 * We allocated a struct page table for rk_obj, so clear
245 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
246 */
247 vma->vm_flags &= ~VM_PFNMAP;
248
249 if (rk_obj->pages)
250 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);
251 else
252 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);
253
254 if (ret)
255 drm_gem_vm_close(vma);
256
257 return ret;
258}
259
260int rockchip_gem_mmap_buf(struct drm_gem_object *obj,
261 struct vm_area_struct *vma)
262{
263 int ret;
264
265 ret = drm_gem_mmap_obj(obj, obj->size, vma);
266 if (ret)
267 return ret;
268
269 return rockchip_drm_gem_object_mmap(obj, vma);
270}
271
272/* drm driver mmap file operations */
273int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma)
274{
275 struct drm_gem_object *obj;
276 int ret;
277
278 ret = drm_gem_mmap(filp, vma);
279 if (ret)
280 return ret;
281
282 /*
283 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
284 * whole buffer from the start.
285 */
286 vma->vm_pgoff = 0;
287
288 obj = vma->vm_private_data;
289
290 return rockchip_drm_gem_object_mmap(obj, vma);
291}
292
293static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)
294{
295 drm_gem_object_release(&rk_obj->base);
296 kfree(rk_obj);
297}
298
299static const struct drm_gem_object_funcs rockchip_gem_object_funcs = {
300 .free = rockchip_gem_free_object,
301 .get_sg_table = rockchip_gem_prime_get_sg_table,
302 .vmap = rockchip_gem_prime_vmap,
303 .vunmap = rockchip_gem_prime_vunmap,
304 .vm_ops = &drm_gem_cma_vm_ops,
305};
306
307static struct rockchip_gem_object *
308 rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)
309{
310 struct rockchip_gem_object *rk_obj;
311 struct drm_gem_object *obj;
312
313 size = round_up(size, PAGE_SIZE);
314
315 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);
316 if (!rk_obj)
317 return ERR_PTR(-ENOMEM);
318
319 obj = &rk_obj->base;
320
321 obj->funcs = &rockchip_gem_object_funcs;
322
323 drm_gem_object_init(drm, obj, size);
324
325 return rk_obj;
326}
327
328struct rockchip_gem_object *
329rockchip_gem_create_object(struct drm_device *drm, unsigned int size,
330 bool alloc_kmap)
331{
332 struct rockchip_gem_object *rk_obj;
333 int ret;
334
335 rk_obj = rockchip_gem_alloc_object(drm, size);
336 if (IS_ERR(rk_obj))
337 return rk_obj;
338
339 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);
340 if (ret)
341 goto err_free_rk_obj;
342
343 return rk_obj;
344
345err_free_rk_obj:
346 rockchip_gem_release_object(rk_obj);
347 return ERR_PTR(ret);
348}
349
350/*
351 * rockchip_gem_free_object - (struct drm_gem_object_funcs)->free
352 * callback function
353 */
354void rockchip_gem_free_object(struct drm_gem_object *obj)
355{
356 struct drm_device *drm = obj->dev;
357 struct rockchip_drm_private *private = drm->dev_private;
358 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
359
360 if (obj->import_attach) {
361 if (private->domain) {
362 rockchip_gem_iommu_unmap(rk_obj);
363 } else {
364 dma_unmap_sgtable(drm->dev, rk_obj->sgt,
365 DMA_BIDIRECTIONAL, 0);
366 }
367 drm_prime_gem_destroy(obj, rk_obj->sgt);
368 } else {
369 rockchip_gem_free_buf(rk_obj);
370 }
371
372 rockchip_gem_release_object(rk_obj);
373}
374
375/*
376 * rockchip_gem_create_with_handle - allocate an object with the given
377 * size and create a gem handle on it
378 *
379 * returns a struct rockchip_gem_object* on success or ERR_PTR values
380 * on failure.
381 */
382static struct rockchip_gem_object *
383rockchip_gem_create_with_handle(struct drm_file *file_priv,
384 struct drm_device *drm, unsigned int size,
385 unsigned int *handle)
386{
387 struct rockchip_gem_object *rk_obj;
388 struct drm_gem_object *obj;
389 int ret;
390
391 rk_obj = rockchip_gem_create_object(drm, size, false);
392 if (IS_ERR(rk_obj))
393 return ERR_CAST(rk_obj);
394
395 obj = &rk_obj->base;
396
397 /*
398 * allocate a id of idr table where the obj is registered
399 * and handle has the id what user can see.
400 */
401 ret = drm_gem_handle_create(file_priv, obj, handle);
402 if (ret)
403 goto err_handle_create;
404
405 /* drop reference from allocate - handle holds it now. */
406 drm_gem_object_put(obj);
407
408 return rk_obj;
409
410err_handle_create:
411 rockchip_gem_free_object(obj);
412
413 return ERR_PTR(ret);
414}
415
416/*
417 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback
418 * function
419 *
420 * This aligns the pitch and size arguments to the minimum required. wrap
421 * this into your own function if you need bigger alignment.
422 */
423int rockchip_gem_dumb_create(struct drm_file *file_priv,
424 struct drm_device *dev,
425 struct drm_mode_create_dumb *args)
426{
427 struct rockchip_gem_object *rk_obj;
428 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
429
430 /*
431 * align to 64 bytes since Mali requires it.
432 */
433 args->pitch = ALIGN(min_pitch, 64);
434 args->size = args->pitch * args->height;
435
436 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
437 &args->handle);
438
439 return PTR_ERR_OR_ZERO(rk_obj);
440}
441
442/*
443 * Allocate a sg_table for this GEM object.
444 * Note: Both the table's contents, and the sg_table itself must be freed by
445 * the caller.
446 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
447 */
448struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)
449{
450 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
451 struct drm_device *drm = obj->dev;
452 struct sg_table *sgt;
453 int ret;
454
455 if (rk_obj->pages)
456 return drm_prime_pages_to_sg(obj->dev, rk_obj->pages, rk_obj->num_pages);
457
458 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
459 if (!sgt)
460 return ERR_PTR(-ENOMEM);
461
462 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,
463 rk_obj->dma_addr, obj->size,
464 rk_obj->dma_attrs);
465 if (ret) {
466 DRM_ERROR("failed to allocate sgt, %d\n", ret);
467 kfree(sgt);
468 return ERR_PTR(ret);
469 }
470
471 return sgt;
472}
473
474static int
475rockchip_gem_iommu_map_sg(struct drm_device *drm,
476 struct dma_buf_attachment *attach,
477 struct sg_table *sg,
478 struct rockchip_gem_object *rk_obj)
479{
480 rk_obj->sgt = sg;
481 return rockchip_gem_iommu_map(rk_obj);
482}
483
484static int
485rockchip_gem_dma_map_sg(struct drm_device *drm,
486 struct dma_buf_attachment *attach,
487 struct sg_table *sg,
488 struct rockchip_gem_object *rk_obj)
489{
490 int err = dma_map_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0);
491 if (err)
492 return err;
493
494 if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
495 DRM_ERROR("failed to map sg_table to contiguous linear address.\n");
496 dma_unmap_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0);
497 return -EINVAL;
498 }
499
500 rk_obj->dma_addr = sg_dma_address(sg->sgl);
501 rk_obj->sgt = sg;
502 return 0;
503}
504
505struct drm_gem_object *
506rockchip_gem_prime_import_sg_table(struct drm_device *drm,
507 struct dma_buf_attachment *attach,
508 struct sg_table *sg)
509{
510 struct rockchip_drm_private *private = drm->dev_private;
511 struct rockchip_gem_object *rk_obj;
512 int ret;
513
514 rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);
515 if (IS_ERR(rk_obj))
516 return ERR_CAST(rk_obj);
517
518 if (private->domain)
519 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);
520 else
521 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);
522
523 if (ret < 0) {
524 DRM_ERROR("failed to import sg table: %d\n", ret);
525 goto err_free_rk_obj;
526 }
527
528 return &rk_obj->base;
529
530err_free_rk_obj:
531 rockchip_gem_release_object(rk_obj);
532 return ERR_PTR(ret);
533}
534
535int rockchip_gem_prime_vmap(struct drm_gem_object *obj, struct dma_buf_map *map)
536{
537 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
538
539 if (rk_obj->pages) {
540 void *vaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,
541 pgprot_writecombine(PAGE_KERNEL));
542 if (!vaddr)
543 return -ENOMEM;
544 dma_buf_map_set_vaddr(map, vaddr);
545 return 0;
546 }
547
548 if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)
549 return -ENOMEM;
550 dma_buf_map_set_vaddr(map, rk_obj->kvaddr);
551
552 return 0;
553}
554
555void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map)
556{
557 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
558
559 if (rk_obj->pages) {
560 vunmap(map->vaddr);
561 return;
562 }
563
564 /* Nothing to do if allocated by DMA mapping API. */
565}