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