Commit | Line | Data |
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96f60e37 RK |
1 | /* |
2 | * Copyright (C) 2012 Russell King | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | #include <linux/dma-buf.h> | |
9 | #include <linux/dma-mapping.h> | |
10 | #include <linux/shmem_fs.h> | |
11 | #include <drm/drmP.h> | |
12 | #include "armada_drm.h" | |
13 | #include "armada_gem.h" | |
14 | #include <drm/armada_drm.h> | |
15 | #include "armada_ioctlP.h" | |
16 | ||
17 | static int armada_gem_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
18 | { | |
19 | struct armada_gem_object *obj = drm_to_armada_gem(vma->vm_private_data); | |
20 | unsigned long addr = (unsigned long)vmf->virtual_address; | |
21 | unsigned long pfn = obj->phys_addr >> PAGE_SHIFT; | |
22 | int ret; | |
23 | ||
24 | pfn += (addr - vma->vm_start) >> PAGE_SHIFT; | |
25 | ret = vm_insert_pfn(vma, addr, pfn); | |
26 | ||
27 | switch (ret) { | |
28 | case 0: | |
29 | case -EBUSY: | |
30 | return VM_FAULT_NOPAGE; | |
31 | case -ENOMEM: | |
32 | return VM_FAULT_OOM; | |
33 | default: | |
34 | return VM_FAULT_SIGBUS; | |
35 | } | |
36 | } | |
37 | ||
38 | const struct vm_operations_struct armada_gem_vm_ops = { | |
39 | .fault = armada_gem_vm_fault, | |
40 | .open = drm_gem_vm_open, | |
41 | .close = drm_gem_vm_close, | |
42 | }; | |
43 | ||
44 | static size_t roundup_gem_size(size_t size) | |
45 | { | |
46 | return roundup(size, PAGE_SIZE); | |
47 | } | |
48 | ||
96f60e37 RK |
49 | void armada_gem_free_object(struct drm_gem_object *obj) |
50 | { | |
51 | struct armada_gem_object *dobj = drm_to_armada_gem(obj); | |
0b8ebeac | 52 | struct armada_private *priv = obj->dev->dev_private; |
96f60e37 RK |
53 | |
54 | DRM_DEBUG_DRIVER("release obj %p\n", dobj); | |
55 | ||
56 | drm_gem_free_mmap_offset(&dobj->obj); | |
57 | ||
0b8ebeac DV |
58 | might_lock(&priv->linear_lock); |
59 | ||
96f60e37 RK |
60 | if (dobj->page) { |
61 | /* page backed memory */ | |
62 | unsigned int order = get_order(dobj->obj.size); | |
63 | __free_pages(dobj->page, order); | |
64 | } else if (dobj->linear) { | |
65 | /* linear backed memory */ | |
0b8ebeac | 66 | mutex_lock(&priv->linear_lock); |
96f60e37 | 67 | drm_mm_remove_node(dobj->linear); |
0b8ebeac | 68 | mutex_unlock(&priv->linear_lock); |
96f60e37 RK |
69 | kfree(dobj->linear); |
70 | if (dobj->addr) | |
71 | iounmap(dobj->addr); | |
72 | } | |
73 | ||
74 | if (dobj->obj.import_attach) { | |
75 | /* We only ever display imported data */ | |
0481c8c4 RK |
76 | if (dobj->sgt) |
77 | dma_buf_unmap_attachment(dobj->obj.import_attach, | |
78 | dobj->sgt, DMA_TO_DEVICE); | |
96f60e37 RK |
79 | drm_prime_gem_destroy(&dobj->obj, NULL); |
80 | } | |
81 | ||
82 | drm_gem_object_release(&dobj->obj); | |
83 | ||
84 | kfree(dobj); | |
85 | } | |
86 | ||
87 | int | |
88 | armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj) | |
89 | { | |
90 | struct armada_private *priv = dev->dev_private; | |
91 | size_t size = obj->obj.size; | |
92 | ||
93 | if (obj->page || obj->linear) | |
94 | return 0; | |
95 | ||
96 | /* | |
97 | * If it is a small allocation (typically cursor, which will | |
98 | * be 32x64 or 64x32 ARGB pixels) try to get it from the system. | |
99 | * Framebuffers will never be this small (our minimum size for | |
100 | * framebuffers is larger than this anyway.) Such objects are | |
101 | * only accessed by the CPU so we don't need any special handing | |
102 | * here. | |
103 | */ | |
104 | if (size <= 8192) { | |
105 | unsigned int order = get_order(size); | |
106 | struct page *p = alloc_pages(GFP_KERNEL, order); | |
107 | ||
108 | if (p) { | |
109 | obj->addr = page_address(p); | |
110 | obj->phys_addr = page_to_phys(p); | |
111 | obj->page = p; | |
112 | ||
113 | memset(obj->addr, 0, PAGE_ALIGN(size)); | |
114 | } | |
115 | } | |
116 | ||
117 | /* | |
118 | * We could grab something from CMA if it's enabled, but that | |
119 | * involves building in a problem: | |
120 | * | |
121 | * CMA's interface uses dma_alloc_coherent(), which provides us | |
122 | * with an CPU virtual address and a device address. | |
123 | * | |
124 | * The CPU virtual address may be either an address in the kernel | |
125 | * direct mapped region (for example, as it would be on x86) or | |
126 | * it may be remapped into another part of kernel memory space | |
127 | * (eg, as it would be on ARM.) This means virt_to_phys() on the | |
128 | * returned virtual address is invalid depending on the architecture | |
129 | * implementation. | |
130 | * | |
131 | * The device address may also not be a physical address; it may | |
132 | * be that there is some kind of remapping between the device and | |
133 | * system RAM, which makes the use of the device address also | |
134 | * unsafe to re-use as a physical address. | |
135 | * | |
136 | * This makes DRM usage of dma_alloc_coherent() in a generic way | |
137 | * at best very questionable and unsafe. | |
138 | */ | |
139 | ||
140 | /* Otherwise, grab it from our linear allocation */ | |
141 | if (!obj->page) { | |
142 | struct drm_mm_node *node; | |
143 | unsigned align = min_t(unsigned, size, SZ_2M); | |
144 | void __iomem *ptr; | |
145 | int ret; | |
146 | ||
147 | node = kzalloc(sizeof(*node), GFP_KERNEL); | |
148 | if (!node) | |
149 | return -ENOSPC; | |
150 | ||
0b8ebeac | 151 | mutex_lock(&priv->linear_lock); |
96f60e37 RK |
152 | ret = drm_mm_insert_node(&priv->linear, node, size, align, |
153 | DRM_MM_SEARCH_DEFAULT); | |
0b8ebeac | 154 | mutex_unlock(&priv->linear_lock); |
96f60e37 RK |
155 | if (ret) { |
156 | kfree(node); | |
157 | return ret; | |
158 | } | |
159 | ||
160 | obj->linear = node; | |
161 | ||
162 | /* Ensure that the memory we're returning is cleared. */ | |
163 | ptr = ioremap_wc(obj->linear->start, size); | |
164 | if (!ptr) { | |
0b8ebeac | 165 | mutex_lock(&priv->linear_lock); |
96f60e37 | 166 | drm_mm_remove_node(obj->linear); |
0b8ebeac | 167 | mutex_unlock(&priv->linear_lock); |
96f60e37 RK |
168 | kfree(obj->linear); |
169 | obj->linear = NULL; | |
170 | return -ENOMEM; | |
171 | } | |
172 | ||
173 | memset_io(ptr, 0, size); | |
174 | iounmap(ptr); | |
175 | ||
176 | obj->phys_addr = obj->linear->start; | |
177 | obj->dev_addr = obj->linear->start; | |
178 | } | |
179 | ||
7513e095 RK |
180 | DRM_DEBUG_DRIVER("obj %p phys %#llx dev %#llx\n", obj, |
181 | (unsigned long long)obj->phys_addr, | |
182 | (unsigned long long)obj->dev_addr); | |
96f60e37 RK |
183 | |
184 | return 0; | |
185 | } | |
186 | ||
187 | void * | |
188 | armada_gem_map_object(struct drm_device *dev, struct armada_gem_object *dobj) | |
189 | { | |
190 | /* only linear objects need to be ioremap'd */ | |
191 | if (!dobj->addr && dobj->linear) | |
192 | dobj->addr = ioremap_wc(dobj->phys_addr, dobj->obj.size); | |
193 | return dobj->addr; | |
194 | } | |
195 | ||
196 | struct armada_gem_object * | |
197 | armada_gem_alloc_private_object(struct drm_device *dev, size_t size) | |
198 | { | |
199 | struct armada_gem_object *obj; | |
200 | ||
201 | size = roundup_gem_size(size); | |
202 | ||
203 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); | |
204 | if (!obj) | |
205 | return NULL; | |
206 | ||
207 | drm_gem_private_object_init(dev, &obj->obj, size); | |
208 | obj->dev_addr = DMA_ERROR_CODE; | |
209 | ||
210 | DRM_DEBUG_DRIVER("alloc private obj %p size %zu\n", obj, size); | |
211 | ||
212 | return obj; | |
213 | } | |
214 | ||
215 | struct armada_gem_object *armada_gem_alloc_object(struct drm_device *dev, | |
216 | size_t size) | |
217 | { | |
218 | struct armada_gem_object *obj; | |
219 | struct address_space *mapping; | |
220 | ||
221 | size = roundup_gem_size(size); | |
222 | ||
223 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); | |
224 | if (!obj) | |
225 | return NULL; | |
226 | ||
227 | if (drm_gem_object_init(dev, &obj->obj, size)) { | |
228 | kfree(obj); | |
229 | return NULL; | |
230 | } | |
231 | ||
232 | obj->dev_addr = DMA_ERROR_CODE; | |
233 | ||
a455589f | 234 | mapping = file_inode(obj->obj.filp)->i_mapping; |
96f60e37 RK |
235 | mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RECLAIMABLE); |
236 | ||
237 | DRM_DEBUG_DRIVER("alloc obj %p size %zu\n", obj, size); | |
238 | ||
239 | return obj; | |
240 | } | |
241 | ||
242 | /* Dumb alloc support */ | |
243 | int armada_gem_dumb_create(struct drm_file *file, struct drm_device *dev, | |
244 | struct drm_mode_create_dumb *args) | |
245 | { | |
246 | struct armada_gem_object *dobj; | |
247 | u32 handle; | |
248 | size_t size; | |
249 | int ret; | |
250 | ||
251 | args->pitch = armada_pitch(args->width, args->bpp); | |
252 | args->size = size = args->pitch * args->height; | |
253 | ||
254 | dobj = armada_gem_alloc_private_object(dev, size); | |
255 | if (dobj == NULL) | |
256 | return -ENOMEM; | |
257 | ||
258 | ret = armada_gem_linear_back(dev, dobj); | |
259 | if (ret) | |
260 | goto err; | |
261 | ||
262 | ret = drm_gem_handle_create(file, &dobj->obj, &handle); | |
263 | if (ret) | |
264 | goto err; | |
265 | ||
266 | args->handle = handle; | |
267 | ||
268 | /* drop reference from allocate - handle holds it now */ | |
269 | DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle); | |
270 | err: | |
271 | drm_gem_object_unreference_unlocked(&dobj->obj); | |
272 | return ret; | |
273 | } | |
274 | ||
275 | int armada_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, | |
276 | uint32_t handle, uint64_t *offset) | |
277 | { | |
278 | struct armada_gem_object *obj; | |
279 | int ret = 0; | |
280 | ||
96f60e37 RK |
281 | obj = armada_gem_object_lookup(dev, file, handle); |
282 | if (!obj) { | |
283 | DRM_ERROR("failed to lookup gem object\n"); | |
39146d6f | 284 | return -EINVAL; |
96f60e37 RK |
285 | } |
286 | ||
287 | /* Don't allow imported objects to be mapped */ | |
288 | if (obj->obj.import_attach) { | |
289 | ret = -EINVAL; | |
8d6185b5 | 290 | goto err_unref; |
96f60e37 RK |
291 | } |
292 | ||
293 | ret = drm_gem_create_mmap_offset(&obj->obj); | |
294 | if (ret == 0) { | |
295 | *offset = drm_vma_node_offset_addr(&obj->obj.vma_node); | |
296 | DRM_DEBUG_DRIVER("handle %#x offset %llx\n", handle, *offset); | |
297 | } | |
298 | ||
8d6185b5 | 299 | err_unref: |
39146d6f | 300 | drm_gem_object_unreference_unlocked(&obj->obj); |
96f60e37 RK |
301 | |
302 | return ret; | |
303 | } | |
304 | ||
305 | int armada_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev, | |
306 | uint32_t handle) | |
307 | { | |
308 | return drm_gem_handle_delete(file, handle); | |
309 | } | |
310 | ||
311 | /* Private driver gem ioctls */ | |
312 | int armada_gem_create_ioctl(struct drm_device *dev, void *data, | |
313 | struct drm_file *file) | |
314 | { | |
315 | struct drm_armada_gem_create *args = data; | |
316 | struct armada_gem_object *dobj; | |
317 | size_t size; | |
318 | u32 handle; | |
319 | int ret; | |
320 | ||
321 | if (args->size == 0) | |
322 | return -ENOMEM; | |
323 | ||
324 | size = args->size; | |
325 | ||
326 | dobj = armada_gem_alloc_object(dev, size); | |
327 | if (dobj == NULL) | |
328 | return -ENOMEM; | |
329 | ||
330 | ret = drm_gem_handle_create(file, &dobj->obj, &handle); | |
331 | if (ret) | |
332 | goto err; | |
333 | ||
334 | args->handle = handle; | |
335 | ||
336 | /* drop reference from allocate - handle holds it now */ | |
337 | DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle); | |
338 | err: | |
339 | drm_gem_object_unreference_unlocked(&dobj->obj); | |
340 | return ret; | |
341 | } | |
342 | ||
343 | /* Map a shmem-backed object into process memory space */ | |
344 | int armada_gem_mmap_ioctl(struct drm_device *dev, void *data, | |
345 | struct drm_file *file) | |
346 | { | |
347 | struct drm_armada_gem_mmap *args = data; | |
348 | struct armada_gem_object *dobj; | |
349 | unsigned long addr; | |
350 | ||
351 | dobj = armada_gem_object_lookup(dev, file, args->handle); | |
352 | if (dobj == NULL) | |
353 | return -ENOENT; | |
354 | ||
355 | if (!dobj->obj.filp) { | |
7a6f7133 | 356 | drm_gem_object_unreference_unlocked(&dobj->obj); |
96f60e37 RK |
357 | return -EINVAL; |
358 | } | |
359 | ||
360 | addr = vm_mmap(dobj->obj.filp, 0, args->size, PROT_READ | PROT_WRITE, | |
361 | MAP_SHARED, args->offset); | |
7a6f7133 | 362 | drm_gem_object_unreference_unlocked(&dobj->obj); |
96f60e37 RK |
363 | if (IS_ERR_VALUE(addr)) |
364 | return addr; | |
365 | ||
366 | args->addr = addr; | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data, | |
372 | struct drm_file *file) | |
373 | { | |
374 | struct drm_armada_gem_pwrite *args = data; | |
375 | struct armada_gem_object *dobj; | |
376 | char __user *ptr; | |
377 | int ret; | |
378 | ||
379 | DRM_DEBUG_DRIVER("handle %u off %u size %u ptr 0x%llx\n", | |
380 | args->handle, args->offset, args->size, args->ptr); | |
381 | ||
382 | if (args->size == 0) | |
383 | return 0; | |
384 | ||
385 | ptr = (char __user *)(uintptr_t)args->ptr; | |
386 | ||
387 | if (!access_ok(VERIFY_READ, ptr, args->size)) | |
388 | return -EFAULT; | |
389 | ||
390 | ret = fault_in_multipages_readable(ptr, args->size); | |
391 | if (ret) | |
392 | return ret; | |
393 | ||
394 | dobj = armada_gem_object_lookup(dev, file, args->handle); | |
395 | if (dobj == NULL) | |
396 | return -ENOENT; | |
397 | ||
398 | /* Must be a kernel-mapped object */ | |
399 | if (!dobj->addr) | |
400 | return -EINVAL; | |
401 | ||
402 | if (args->offset > dobj->obj.size || | |
403 | args->size > dobj->obj.size - args->offset) { | |
404 | DRM_ERROR("invalid size: object size %u\n", dobj->obj.size); | |
405 | ret = -EINVAL; | |
406 | goto unref; | |
407 | } | |
408 | ||
409 | if (copy_from_user(dobj->addr + args->offset, ptr, args->size)) { | |
410 | ret = -EFAULT; | |
411 | } else if (dobj->update) { | |
412 | dobj->update(dobj->update_data); | |
413 | ret = 0; | |
414 | } | |
415 | ||
416 | unref: | |
417 | drm_gem_object_unreference_unlocked(&dobj->obj); | |
418 | return ret; | |
419 | } | |
420 | ||
421 | /* Prime support */ | |
422 | struct sg_table * | |
423 | armada_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, | |
424 | enum dma_data_direction dir) | |
425 | { | |
426 | struct drm_gem_object *obj = attach->dmabuf->priv; | |
427 | struct armada_gem_object *dobj = drm_to_armada_gem(obj); | |
428 | struct scatterlist *sg; | |
429 | struct sg_table *sgt; | |
430 | int i, num; | |
431 | ||
432 | sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); | |
433 | if (!sgt) | |
434 | return NULL; | |
435 | ||
436 | if (dobj->obj.filp) { | |
437 | struct address_space *mapping; | |
96f60e37 RK |
438 | int count; |
439 | ||
440 | count = dobj->obj.size / PAGE_SIZE; | |
441 | if (sg_alloc_table(sgt, count, GFP_KERNEL)) | |
442 | goto free_sgt; | |
443 | ||
444 | mapping = file_inode(dobj->obj.filp)->i_mapping; | |
96f60e37 RK |
445 | |
446 | for_each_sg(sgt->sgl, sg, count, i) { | |
447 | struct page *page; | |
448 | ||
2524fc7f | 449 | page = shmem_read_mapping_page(mapping, i); |
96f60e37 RK |
450 | if (IS_ERR(page)) { |
451 | num = i; | |
452 | goto release; | |
453 | } | |
454 | ||
455 | sg_set_page(sg, page, PAGE_SIZE, 0); | |
456 | } | |
457 | ||
458 | if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) { | |
459 | num = sgt->nents; | |
460 | goto release; | |
461 | } | |
462 | } else if (dobj->page) { | |
463 | /* Single contiguous page */ | |
464 | if (sg_alloc_table(sgt, 1, GFP_KERNEL)) | |
465 | goto free_sgt; | |
466 | ||
467 | sg_set_page(sgt->sgl, dobj->page, dobj->obj.size, 0); | |
468 | ||
469 | if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) | |
470 | goto free_table; | |
471 | } else if (dobj->linear) { | |
472 | /* Single contiguous physical region - no struct page */ | |
473 | if (sg_alloc_table(sgt, 1, GFP_KERNEL)) | |
474 | goto free_sgt; | |
475 | sg_dma_address(sgt->sgl) = dobj->dev_addr; | |
476 | sg_dma_len(sgt->sgl) = dobj->obj.size; | |
477 | } else { | |
478 | goto free_sgt; | |
479 | } | |
480 | return sgt; | |
481 | ||
482 | release: | |
483 | for_each_sg(sgt->sgl, sg, num, i) | |
09cbfeaf | 484 | put_page(sg_page(sg)); |
96f60e37 RK |
485 | free_table: |
486 | sg_free_table(sgt); | |
487 | free_sgt: | |
488 | kfree(sgt); | |
489 | return NULL; | |
490 | } | |
491 | ||
492 | static void armada_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach, | |
493 | struct sg_table *sgt, enum dma_data_direction dir) | |
494 | { | |
495 | struct drm_gem_object *obj = attach->dmabuf->priv; | |
496 | struct armada_gem_object *dobj = drm_to_armada_gem(obj); | |
497 | int i; | |
498 | ||
499 | if (!dobj->linear) | |
500 | dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir); | |
501 | ||
502 | if (dobj->obj.filp) { | |
503 | struct scatterlist *sg; | |
504 | for_each_sg(sgt->sgl, sg, sgt->nents, i) | |
09cbfeaf | 505 | put_page(sg_page(sg)); |
96f60e37 RK |
506 | } |
507 | ||
508 | sg_free_table(sgt); | |
509 | kfree(sgt); | |
510 | } | |
511 | ||
512 | static void *armada_gem_dmabuf_no_kmap(struct dma_buf *buf, unsigned long n) | |
513 | { | |
514 | return NULL; | |
515 | } | |
516 | ||
517 | static void | |
518 | armada_gem_dmabuf_no_kunmap(struct dma_buf *buf, unsigned long n, void *addr) | |
519 | { | |
520 | } | |
521 | ||
522 | static int | |
523 | armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma) | |
524 | { | |
525 | return -EINVAL; | |
526 | } | |
527 | ||
528 | static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = { | |
529 | .map_dma_buf = armada_gem_prime_map_dma_buf, | |
530 | .unmap_dma_buf = armada_gem_prime_unmap_dma_buf, | |
531 | .release = drm_gem_dmabuf_release, | |
532 | .kmap_atomic = armada_gem_dmabuf_no_kmap, | |
533 | .kunmap_atomic = armada_gem_dmabuf_no_kunmap, | |
534 | .kmap = armada_gem_dmabuf_no_kmap, | |
535 | .kunmap = armada_gem_dmabuf_no_kunmap, | |
536 | .mmap = armada_gem_dmabuf_mmap, | |
537 | }; | |
538 | ||
539 | struct dma_buf * | |
540 | armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj, | |
541 | int flags) | |
542 | { | |
d8fbe341 SS |
543 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
544 | ||
545 | exp_info.ops = &armada_gem_prime_dmabuf_ops; | |
546 | exp_info.size = obj->size; | |
547 | exp_info.flags = O_RDWR; | |
548 | exp_info.priv = obj; | |
549 | ||
550 | return dma_buf_export(&exp_info); | |
96f60e37 RK |
551 | } |
552 | ||
553 | struct drm_gem_object * | |
554 | armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf) | |
555 | { | |
556 | struct dma_buf_attachment *attach; | |
557 | struct armada_gem_object *dobj; | |
558 | ||
559 | if (buf->ops == &armada_gem_prime_dmabuf_ops) { | |
560 | struct drm_gem_object *obj = buf->priv; | |
561 | if (obj->dev == dev) { | |
562 | /* | |
563 | * Importing our own dmabuf(s) increases the | |
564 | * refcount on the gem object itself. | |
565 | */ | |
566 | drm_gem_object_reference(obj); | |
96f60e37 RK |
567 | return obj; |
568 | } | |
569 | } | |
570 | ||
571 | attach = dma_buf_attach(buf, dev->dev); | |
572 | if (IS_ERR(attach)) | |
573 | return ERR_CAST(attach); | |
574 | ||
575 | dobj = armada_gem_alloc_private_object(dev, buf->size); | |
576 | if (!dobj) { | |
577 | dma_buf_detach(buf, attach); | |
578 | return ERR_PTR(-ENOMEM); | |
579 | } | |
580 | ||
581 | dobj->obj.import_attach = attach; | |
5cd52688 | 582 | get_dma_buf(buf); |
96f60e37 RK |
583 | |
584 | /* | |
585 | * Don't call dma_buf_map_attachment() here - it maps the | |
586 | * scatterlist immediately for DMA, and this is not always | |
587 | * an appropriate thing to do. | |
588 | */ | |
589 | return &dobj->obj; | |
590 | } | |
591 | ||
592 | int armada_gem_map_import(struct armada_gem_object *dobj) | |
593 | { | |
594 | int ret; | |
595 | ||
596 | dobj->sgt = dma_buf_map_attachment(dobj->obj.import_attach, | |
597 | DMA_TO_DEVICE); | |
598 | if (!dobj->sgt) { | |
599 | DRM_ERROR("dma_buf_map_attachment() returned NULL\n"); | |
600 | return -EINVAL; | |
601 | } | |
602 | if (IS_ERR(dobj->sgt)) { | |
603 | ret = PTR_ERR(dobj->sgt); | |
604 | dobj->sgt = NULL; | |
605 | DRM_ERROR("dma_buf_map_attachment() error: %d\n", ret); | |
606 | return ret; | |
607 | } | |
608 | if (dobj->sgt->nents > 1) { | |
609 | DRM_ERROR("dma_buf_map_attachment() returned an (unsupported) scattered list\n"); | |
610 | return -EINVAL; | |
611 | } | |
612 | if (sg_dma_len(dobj->sgt->sgl) < dobj->obj.size) { | |
613 | DRM_ERROR("dma_buf_map_attachment() returned a small buffer\n"); | |
614 | return -EINVAL; | |
615 | } | |
616 | dobj->dev_addr = sg_dma_address(dobj->sgt->sgl); | |
617 | return 0; | |
618 | } |