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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 | ||
49 | /* dev->struct_mutex is held here */ | |
50 | void armada_gem_free_object(struct drm_gem_object *obj) | |
51 | { | |
52 | struct armada_gem_object *dobj = drm_to_armada_gem(obj); | |
53 | ||
54 | DRM_DEBUG_DRIVER("release obj %p\n", dobj); | |
55 | ||
56 | drm_gem_free_mmap_offset(&dobj->obj); | |
57 | ||
58 | if (dobj->page) { | |
59 | /* page backed memory */ | |
60 | unsigned int order = get_order(dobj->obj.size); | |
61 | __free_pages(dobj->page, order); | |
62 | } else if (dobj->linear) { | |
63 | /* linear backed memory */ | |
64 | drm_mm_remove_node(dobj->linear); | |
65 | kfree(dobj->linear); | |
66 | if (dobj->addr) | |
67 | iounmap(dobj->addr); | |
68 | } | |
69 | ||
70 | if (dobj->obj.import_attach) { | |
71 | /* We only ever display imported data */ | |
72 | dma_buf_unmap_attachment(dobj->obj.import_attach, dobj->sgt, | |
73 | DMA_TO_DEVICE); | |
74 | drm_prime_gem_destroy(&dobj->obj, NULL); | |
75 | } | |
76 | ||
77 | drm_gem_object_release(&dobj->obj); | |
78 | ||
79 | kfree(dobj); | |
80 | } | |
81 | ||
82 | int | |
83 | armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj) | |
84 | { | |
85 | struct armada_private *priv = dev->dev_private; | |
86 | size_t size = obj->obj.size; | |
87 | ||
88 | if (obj->page || obj->linear) | |
89 | return 0; | |
90 | ||
91 | /* | |
92 | * If it is a small allocation (typically cursor, which will | |
93 | * be 32x64 or 64x32 ARGB pixels) try to get it from the system. | |
94 | * Framebuffers will never be this small (our minimum size for | |
95 | * framebuffers is larger than this anyway.) Such objects are | |
96 | * only accessed by the CPU so we don't need any special handing | |
97 | * here. | |
98 | */ | |
99 | if (size <= 8192) { | |
100 | unsigned int order = get_order(size); | |
101 | struct page *p = alloc_pages(GFP_KERNEL, order); | |
102 | ||
103 | if (p) { | |
104 | obj->addr = page_address(p); | |
105 | obj->phys_addr = page_to_phys(p); | |
106 | obj->page = p; | |
107 | ||
108 | memset(obj->addr, 0, PAGE_ALIGN(size)); | |
109 | } | |
110 | } | |
111 | ||
112 | /* | |
113 | * We could grab something from CMA if it's enabled, but that | |
114 | * involves building in a problem: | |
115 | * | |
116 | * CMA's interface uses dma_alloc_coherent(), which provides us | |
117 | * with an CPU virtual address and a device address. | |
118 | * | |
119 | * The CPU virtual address may be either an address in the kernel | |
120 | * direct mapped region (for example, as it would be on x86) or | |
121 | * it may be remapped into another part of kernel memory space | |
122 | * (eg, as it would be on ARM.) This means virt_to_phys() on the | |
123 | * returned virtual address is invalid depending on the architecture | |
124 | * implementation. | |
125 | * | |
126 | * The device address may also not be a physical address; it may | |
127 | * be that there is some kind of remapping between the device and | |
128 | * system RAM, which makes the use of the device address also | |
129 | * unsafe to re-use as a physical address. | |
130 | * | |
131 | * This makes DRM usage of dma_alloc_coherent() in a generic way | |
132 | * at best very questionable and unsafe. | |
133 | */ | |
134 | ||
135 | /* Otherwise, grab it from our linear allocation */ | |
136 | if (!obj->page) { | |
137 | struct drm_mm_node *node; | |
138 | unsigned align = min_t(unsigned, size, SZ_2M); | |
139 | void __iomem *ptr; | |
140 | int ret; | |
141 | ||
142 | node = kzalloc(sizeof(*node), GFP_KERNEL); | |
143 | if (!node) | |
144 | return -ENOSPC; | |
145 | ||
146 | mutex_lock(&dev->struct_mutex); | |
147 | ret = drm_mm_insert_node(&priv->linear, node, size, align, | |
148 | DRM_MM_SEARCH_DEFAULT); | |
149 | mutex_unlock(&dev->struct_mutex); | |
150 | if (ret) { | |
151 | kfree(node); | |
152 | return ret; | |
153 | } | |
154 | ||
155 | obj->linear = node; | |
156 | ||
157 | /* Ensure that the memory we're returning is cleared. */ | |
158 | ptr = ioremap_wc(obj->linear->start, size); | |
159 | if (!ptr) { | |
160 | mutex_lock(&dev->struct_mutex); | |
161 | drm_mm_remove_node(obj->linear); | |
162 | mutex_unlock(&dev->struct_mutex); | |
163 | kfree(obj->linear); | |
164 | obj->linear = NULL; | |
165 | return -ENOMEM; | |
166 | } | |
167 | ||
168 | memset_io(ptr, 0, size); | |
169 | iounmap(ptr); | |
170 | ||
171 | obj->phys_addr = obj->linear->start; | |
172 | obj->dev_addr = obj->linear->start; | |
173 | } | |
174 | ||
7513e095 RK |
175 | DRM_DEBUG_DRIVER("obj %p phys %#llx dev %#llx\n", obj, |
176 | (unsigned long long)obj->phys_addr, | |
177 | (unsigned long long)obj->dev_addr); | |
96f60e37 RK |
178 | |
179 | return 0; | |
180 | } | |
181 | ||
182 | void * | |
183 | armada_gem_map_object(struct drm_device *dev, struct armada_gem_object *dobj) | |
184 | { | |
185 | /* only linear objects need to be ioremap'd */ | |
186 | if (!dobj->addr && dobj->linear) | |
187 | dobj->addr = ioremap_wc(dobj->phys_addr, dobj->obj.size); | |
188 | return dobj->addr; | |
189 | } | |
190 | ||
191 | struct armada_gem_object * | |
192 | armada_gem_alloc_private_object(struct drm_device *dev, size_t size) | |
193 | { | |
194 | struct armada_gem_object *obj; | |
195 | ||
196 | size = roundup_gem_size(size); | |
197 | ||
198 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); | |
199 | if (!obj) | |
200 | return NULL; | |
201 | ||
202 | drm_gem_private_object_init(dev, &obj->obj, size); | |
203 | obj->dev_addr = DMA_ERROR_CODE; | |
204 | ||
205 | DRM_DEBUG_DRIVER("alloc private obj %p size %zu\n", obj, size); | |
206 | ||
207 | return obj; | |
208 | } | |
209 | ||
210 | struct armada_gem_object *armada_gem_alloc_object(struct drm_device *dev, | |
211 | size_t size) | |
212 | { | |
213 | struct armada_gem_object *obj; | |
214 | struct address_space *mapping; | |
215 | ||
216 | size = roundup_gem_size(size); | |
217 | ||
218 | obj = kzalloc(sizeof(*obj), GFP_KERNEL); | |
219 | if (!obj) | |
220 | return NULL; | |
221 | ||
222 | if (drm_gem_object_init(dev, &obj->obj, size)) { | |
223 | kfree(obj); | |
224 | return NULL; | |
225 | } | |
226 | ||
227 | obj->dev_addr = DMA_ERROR_CODE; | |
228 | ||
a455589f | 229 | mapping = file_inode(obj->obj.filp)->i_mapping; |
96f60e37 RK |
230 | mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RECLAIMABLE); |
231 | ||
232 | DRM_DEBUG_DRIVER("alloc obj %p size %zu\n", obj, size); | |
233 | ||
234 | return obj; | |
235 | } | |
236 | ||
237 | /* Dumb alloc support */ | |
238 | int armada_gem_dumb_create(struct drm_file *file, struct drm_device *dev, | |
239 | struct drm_mode_create_dumb *args) | |
240 | { | |
241 | struct armada_gem_object *dobj; | |
242 | u32 handle; | |
243 | size_t size; | |
244 | int ret; | |
245 | ||
246 | args->pitch = armada_pitch(args->width, args->bpp); | |
247 | args->size = size = args->pitch * args->height; | |
248 | ||
249 | dobj = armada_gem_alloc_private_object(dev, size); | |
250 | if (dobj == NULL) | |
251 | return -ENOMEM; | |
252 | ||
253 | ret = armada_gem_linear_back(dev, dobj); | |
254 | if (ret) | |
255 | goto err; | |
256 | ||
257 | ret = drm_gem_handle_create(file, &dobj->obj, &handle); | |
258 | if (ret) | |
259 | goto err; | |
260 | ||
261 | args->handle = handle; | |
262 | ||
263 | /* drop reference from allocate - handle holds it now */ | |
264 | DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle); | |
265 | err: | |
266 | drm_gem_object_unreference_unlocked(&dobj->obj); | |
267 | return ret; | |
268 | } | |
269 | ||
270 | int armada_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, | |
271 | uint32_t handle, uint64_t *offset) | |
272 | { | |
273 | struct armada_gem_object *obj; | |
274 | int ret = 0; | |
275 | ||
276 | mutex_lock(&dev->struct_mutex); | |
277 | obj = armada_gem_object_lookup(dev, file, handle); | |
278 | if (!obj) { | |
279 | DRM_ERROR("failed to lookup gem object\n"); | |
280 | ret = -EINVAL; | |
281 | goto err_unlock; | |
282 | } | |
283 | ||
284 | /* Don't allow imported objects to be mapped */ | |
285 | if (obj->obj.import_attach) { | |
286 | ret = -EINVAL; | |
287 | goto err_unlock; | |
288 | } | |
289 | ||
290 | ret = drm_gem_create_mmap_offset(&obj->obj); | |
291 | if (ret == 0) { | |
292 | *offset = drm_vma_node_offset_addr(&obj->obj.vma_node); | |
293 | DRM_DEBUG_DRIVER("handle %#x offset %llx\n", handle, *offset); | |
294 | } | |
295 | ||
296 | drm_gem_object_unreference(&obj->obj); | |
297 | err_unlock: | |
298 | mutex_unlock(&dev->struct_mutex); | |
299 | ||
300 | return ret; | |
301 | } | |
302 | ||
303 | int armada_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev, | |
304 | uint32_t handle) | |
305 | { | |
306 | return drm_gem_handle_delete(file, handle); | |
307 | } | |
308 | ||
309 | /* Private driver gem ioctls */ | |
310 | int armada_gem_create_ioctl(struct drm_device *dev, void *data, | |
311 | struct drm_file *file) | |
312 | { | |
313 | struct drm_armada_gem_create *args = data; | |
314 | struct armada_gem_object *dobj; | |
315 | size_t size; | |
316 | u32 handle; | |
317 | int ret; | |
318 | ||
319 | if (args->size == 0) | |
320 | return -ENOMEM; | |
321 | ||
322 | size = args->size; | |
323 | ||
324 | dobj = armada_gem_alloc_object(dev, size); | |
325 | if (dobj == NULL) | |
326 | return -ENOMEM; | |
327 | ||
328 | ret = drm_gem_handle_create(file, &dobj->obj, &handle); | |
329 | if (ret) | |
330 | goto err; | |
331 | ||
332 | args->handle = handle; | |
333 | ||
334 | /* drop reference from allocate - handle holds it now */ | |
335 | DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle); | |
336 | err: | |
337 | drm_gem_object_unreference_unlocked(&dobj->obj); | |
338 | return ret; | |
339 | } | |
340 | ||
341 | /* Map a shmem-backed object into process memory space */ | |
342 | int armada_gem_mmap_ioctl(struct drm_device *dev, void *data, | |
343 | struct drm_file *file) | |
344 | { | |
345 | struct drm_armada_gem_mmap *args = data; | |
346 | struct armada_gem_object *dobj; | |
347 | unsigned long addr; | |
348 | ||
349 | dobj = armada_gem_object_lookup(dev, file, args->handle); | |
350 | if (dobj == NULL) | |
351 | return -ENOENT; | |
352 | ||
353 | if (!dobj->obj.filp) { | |
354 | drm_gem_object_unreference(&dobj->obj); | |
355 | return -EINVAL; | |
356 | } | |
357 | ||
358 | addr = vm_mmap(dobj->obj.filp, 0, args->size, PROT_READ | PROT_WRITE, | |
359 | MAP_SHARED, args->offset); | |
360 | drm_gem_object_unreference(&dobj->obj); | |
361 | if (IS_ERR_VALUE(addr)) | |
362 | return addr; | |
363 | ||
364 | args->addr = addr; | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
369 | int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data, | |
370 | struct drm_file *file) | |
371 | { | |
372 | struct drm_armada_gem_pwrite *args = data; | |
373 | struct armada_gem_object *dobj; | |
374 | char __user *ptr; | |
375 | int ret; | |
376 | ||
377 | DRM_DEBUG_DRIVER("handle %u off %u size %u ptr 0x%llx\n", | |
378 | args->handle, args->offset, args->size, args->ptr); | |
379 | ||
380 | if (args->size == 0) | |
381 | return 0; | |
382 | ||
383 | ptr = (char __user *)(uintptr_t)args->ptr; | |
384 | ||
385 | if (!access_ok(VERIFY_READ, ptr, args->size)) | |
386 | return -EFAULT; | |
387 | ||
388 | ret = fault_in_multipages_readable(ptr, args->size); | |
389 | if (ret) | |
390 | return ret; | |
391 | ||
392 | dobj = armada_gem_object_lookup(dev, file, args->handle); | |
393 | if (dobj == NULL) | |
394 | return -ENOENT; | |
395 | ||
396 | /* Must be a kernel-mapped object */ | |
397 | if (!dobj->addr) | |
398 | return -EINVAL; | |
399 | ||
400 | if (args->offset > dobj->obj.size || | |
401 | args->size > dobj->obj.size - args->offset) { | |
402 | DRM_ERROR("invalid size: object size %u\n", dobj->obj.size); | |
403 | ret = -EINVAL; | |
404 | goto unref; | |
405 | } | |
406 | ||
407 | if (copy_from_user(dobj->addr + args->offset, ptr, args->size)) { | |
408 | ret = -EFAULT; | |
409 | } else if (dobj->update) { | |
410 | dobj->update(dobj->update_data); | |
411 | ret = 0; | |
412 | } | |
413 | ||
414 | unref: | |
415 | drm_gem_object_unreference_unlocked(&dobj->obj); | |
416 | return ret; | |
417 | } | |
418 | ||
419 | /* Prime support */ | |
420 | struct sg_table * | |
421 | armada_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, | |
422 | enum dma_data_direction dir) | |
423 | { | |
424 | struct drm_gem_object *obj = attach->dmabuf->priv; | |
425 | struct armada_gem_object *dobj = drm_to_armada_gem(obj); | |
426 | struct scatterlist *sg; | |
427 | struct sg_table *sgt; | |
428 | int i, num; | |
429 | ||
430 | sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); | |
431 | if (!sgt) | |
432 | return NULL; | |
433 | ||
434 | if (dobj->obj.filp) { | |
435 | struct address_space *mapping; | |
96f60e37 RK |
436 | int count; |
437 | ||
438 | count = dobj->obj.size / PAGE_SIZE; | |
439 | if (sg_alloc_table(sgt, count, GFP_KERNEL)) | |
440 | goto free_sgt; | |
441 | ||
442 | mapping = file_inode(dobj->obj.filp)->i_mapping; | |
96f60e37 RK |
443 | |
444 | for_each_sg(sgt->sgl, sg, count, i) { | |
445 | struct page *page; | |
446 | ||
2524fc7f | 447 | page = shmem_read_mapping_page(mapping, i); |
96f60e37 RK |
448 | if (IS_ERR(page)) { |
449 | num = i; | |
450 | goto release; | |
451 | } | |
452 | ||
453 | sg_set_page(sg, page, PAGE_SIZE, 0); | |
454 | } | |
455 | ||
456 | if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) { | |
457 | num = sgt->nents; | |
458 | goto release; | |
459 | } | |
460 | } else if (dobj->page) { | |
461 | /* Single contiguous page */ | |
462 | if (sg_alloc_table(sgt, 1, GFP_KERNEL)) | |
463 | goto free_sgt; | |
464 | ||
465 | sg_set_page(sgt->sgl, dobj->page, dobj->obj.size, 0); | |
466 | ||
467 | if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) | |
468 | goto free_table; | |
469 | } else if (dobj->linear) { | |
470 | /* Single contiguous physical region - no struct page */ | |
471 | if (sg_alloc_table(sgt, 1, GFP_KERNEL)) | |
472 | goto free_sgt; | |
473 | sg_dma_address(sgt->sgl) = dobj->dev_addr; | |
474 | sg_dma_len(sgt->sgl) = dobj->obj.size; | |
475 | } else { | |
476 | goto free_sgt; | |
477 | } | |
478 | return sgt; | |
479 | ||
480 | release: | |
481 | for_each_sg(sgt->sgl, sg, num, i) | |
482 | page_cache_release(sg_page(sg)); | |
483 | free_table: | |
484 | sg_free_table(sgt); | |
485 | free_sgt: | |
486 | kfree(sgt); | |
487 | return NULL; | |
488 | } | |
489 | ||
490 | static void armada_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach, | |
491 | struct sg_table *sgt, enum dma_data_direction dir) | |
492 | { | |
493 | struct drm_gem_object *obj = attach->dmabuf->priv; | |
494 | struct armada_gem_object *dobj = drm_to_armada_gem(obj); | |
495 | int i; | |
496 | ||
497 | if (!dobj->linear) | |
498 | dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir); | |
499 | ||
500 | if (dobj->obj.filp) { | |
501 | struct scatterlist *sg; | |
502 | for_each_sg(sgt->sgl, sg, sgt->nents, i) | |
503 | page_cache_release(sg_page(sg)); | |
504 | } | |
505 | ||
506 | sg_free_table(sgt); | |
507 | kfree(sgt); | |
508 | } | |
509 | ||
510 | static void *armada_gem_dmabuf_no_kmap(struct dma_buf *buf, unsigned long n) | |
511 | { | |
512 | return NULL; | |
513 | } | |
514 | ||
515 | static void | |
516 | armada_gem_dmabuf_no_kunmap(struct dma_buf *buf, unsigned long n, void *addr) | |
517 | { | |
518 | } | |
519 | ||
520 | static int | |
521 | armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma) | |
522 | { | |
523 | return -EINVAL; | |
524 | } | |
525 | ||
526 | static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = { | |
527 | .map_dma_buf = armada_gem_prime_map_dma_buf, | |
528 | .unmap_dma_buf = armada_gem_prime_unmap_dma_buf, | |
529 | .release = drm_gem_dmabuf_release, | |
530 | .kmap_atomic = armada_gem_dmabuf_no_kmap, | |
531 | .kunmap_atomic = armada_gem_dmabuf_no_kunmap, | |
532 | .kmap = armada_gem_dmabuf_no_kmap, | |
533 | .kunmap = armada_gem_dmabuf_no_kunmap, | |
534 | .mmap = armada_gem_dmabuf_mmap, | |
535 | }; | |
536 | ||
537 | struct dma_buf * | |
538 | armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj, | |
539 | int flags) | |
540 | { | |
541 | return dma_buf_export(obj, &armada_gem_prime_dmabuf_ops, obj->size, | |
3aac4502 | 542 | O_RDWR, NULL); |
96f60e37 RK |
543 | } |
544 | ||
545 | struct drm_gem_object * | |
546 | armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf) | |
547 | { | |
548 | struct dma_buf_attachment *attach; | |
549 | struct armada_gem_object *dobj; | |
550 | ||
551 | if (buf->ops == &armada_gem_prime_dmabuf_ops) { | |
552 | struct drm_gem_object *obj = buf->priv; | |
553 | if (obj->dev == dev) { | |
554 | /* | |
555 | * Importing our own dmabuf(s) increases the | |
556 | * refcount on the gem object itself. | |
557 | */ | |
558 | drm_gem_object_reference(obj); | |
96f60e37 RK |
559 | return obj; |
560 | } | |
561 | } | |
562 | ||
563 | attach = dma_buf_attach(buf, dev->dev); | |
564 | if (IS_ERR(attach)) | |
565 | return ERR_CAST(attach); | |
566 | ||
567 | dobj = armada_gem_alloc_private_object(dev, buf->size); | |
568 | if (!dobj) { | |
569 | dma_buf_detach(buf, attach); | |
570 | return ERR_PTR(-ENOMEM); | |
571 | } | |
572 | ||
573 | dobj->obj.import_attach = attach; | |
5cd52688 | 574 | get_dma_buf(buf); |
96f60e37 RK |
575 | |
576 | /* | |
577 | * Don't call dma_buf_map_attachment() here - it maps the | |
578 | * scatterlist immediately for DMA, and this is not always | |
579 | * an appropriate thing to do. | |
580 | */ | |
581 | return &dobj->obj; | |
582 | } | |
583 | ||
584 | int armada_gem_map_import(struct armada_gem_object *dobj) | |
585 | { | |
586 | int ret; | |
587 | ||
588 | dobj->sgt = dma_buf_map_attachment(dobj->obj.import_attach, | |
589 | DMA_TO_DEVICE); | |
590 | if (!dobj->sgt) { | |
591 | DRM_ERROR("dma_buf_map_attachment() returned NULL\n"); | |
592 | return -EINVAL; | |
593 | } | |
594 | if (IS_ERR(dobj->sgt)) { | |
595 | ret = PTR_ERR(dobj->sgt); | |
596 | dobj->sgt = NULL; | |
597 | DRM_ERROR("dma_buf_map_attachment() error: %d\n", ret); | |
598 | return ret; | |
599 | } | |
600 | if (dobj->sgt->nents > 1) { | |
601 | DRM_ERROR("dma_buf_map_attachment() returned an (unsupported) scattered list\n"); | |
602 | return -EINVAL; | |
603 | } | |
604 | if (sg_dma_len(dobj->sgt->sgl) < dobj->obj.size) { | |
605 | DRM_ERROR("dma_buf_map_attachment() returned a small buffer\n"); | |
606 | return -EINVAL; | |
607 | } | |
608 | dobj->dev_addr = sg_dma_address(dobj->sgt->sgl); | |
609 | return 0; | |
610 | } |