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