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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
17static 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
38const 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
44static size_t roundup_gem_size(size_t size)
45{
46 return roundup(size, PAGE_SIZE);
47}
48
49void armada_gem_free_object(struct drm_gem_object *obj)
50{
51 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
52 struct armada_private *priv = obj->dev->dev_private;
53
54 DRM_DEBUG_DRIVER("release obj %p\n", dobj);
55
56 drm_gem_free_mmap_offset(&dobj->obj);
57
58 might_lock(&priv->linear_lock);
59
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 */
66 mutex_lock(&priv->linear_lock);
67 drm_mm_remove_node(dobj->linear);
68 mutex_unlock(&priv->linear_lock);
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 */
76 if (dobj->sgt)
77 dma_buf_unmap_attachment(dobj->obj.import_attach,
78 dobj->sgt, DMA_TO_DEVICE);
79 drm_prime_gem_destroy(&dobj->obj, NULL);
80 }
81
82 drm_gem_object_release(&dobj->obj);
83
84 kfree(dobj);
85}
86
87int
88armada_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
151 mutex_lock(&priv->linear_lock);
152 ret = drm_mm_insert_node(&priv->linear, node, size, align,
153 DRM_MM_SEARCH_DEFAULT);
154 mutex_unlock(&priv->linear_lock);
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) {
165 mutex_lock(&priv->linear_lock);
166 drm_mm_remove_node(obj->linear);
167 mutex_unlock(&priv->linear_lock);
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
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);
183
184 return 0;
185}
186
187void *
188armada_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
196struct armada_gem_object *
197armada_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
215struct 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
234 mapping = file_inode(obj->obj.filp)->i_mapping;
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 */
243int 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
275int 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
281 obj = armada_gem_object_lookup(dev, file, handle);
282 if (!obj) {
283 DRM_ERROR("failed to lookup gem object\n");
284 return -EINVAL;
285 }
286
287 /* Don't allow imported objects to be mapped */
288 if (obj->obj.import_attach) {
289 ret = -EINVAL;
290 goto err_unref;
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
299 err_unref:
300 drm_gem_object_unreference_unlocked(&obj->obj);
301
302 return ret;
303}
304
305int 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 */
312int 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 */
344int 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) {
356 drm_gem_object_unreference_unlocked(&dobj->obj);
357 return -EINVAL;
358 }
359
360 addr = vm_mmap(dobj->obj.filp, 0, args->size, PROT_READ | PROT_WRITE,
361 MAP_SHARED, args->offset);
362 drm_gem_object_unreference_unlocked(&dobj->obj);
363 if (IS_ERR_VALUE(addr))
364 return addr;
365
366 args->addr = addr;
367
368 return 0;
369}
370
371int 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 */
422struct sg_table *
423armada_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;
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;
445
446 for_each_sg(sgt->sgl, sg, count, i) {
447 struct page *page;
448
449 page = shmem_read_mapping_page(mapping, i);
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)
484 put_page(sg_page(sg));
485 free_table:
486 sg_free_table(sgt);
487 free_sgt:
488 kfree(sgt);
489 return NULL;
490}
491
492static 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)
505 put_page(sg_page(sg));
506 }
507
508 sg_free_table(sgt);
509 kfree(sgt);
510}
511
512static void *armada_gem_dmabuf_no_kmap(struct dma_buf *buf, unsigned long n)
513{
514 return NULL;
515}
516
517static void
518armada_gem_dmabuf_no_kunmap(struct dma_buf *buf, unsigned long n, void *addr)
519{
520}
521
522static int
523armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
524{
525 return -EINVAL;
526}
527
528static 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
539struct dma_buf *
540armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj,
541 int flags)
542{
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);
551}
552
553struct drm_gem_object *
554armada_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);
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;
582 get_dma_buf(buf);
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
592int 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}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Russell King
4 */
5
6#include <linux/dma-buf.h>
7#include <linux/dma-mapping.h>
8#include <linux/mman.h>
9#include <linux/shmem_fs.h>
10
11#include <drm/armada_drm.h>
12#include <drm/drm_prime.h>
13
14#include "armada_drm.h"
15#include "armada_gem.h"
16#include "armada_ioctlP.h"
17
18MODULE_IMPORT_NS(DMA_BUF);
19
20static vm_fault_t armada_gem_vm_fault(struct vm_fault *vmf)
21{
22 struct drm_gem_object *gobj = vmf->vma->vm_private_data;
23 struct armada_gem_object *obj = drm_to_armada_gem(gobj);
24 unsigned long pfn = obj->phys_addr >> PAGE_SHIFT;
25
26 pfn += (vmf->address - vmf->vma->vm_start) >> PAGE_SHIFT;
27 return vmf_insert_pfn(vmf->vma, vmf->address, pfn);
28}
29
30static const struct vm_operations_struct armada_gem_vm_ops = {
31 .fault = armada_gem_vm_fault,
32 .open = drm_gem_vm_open,
33 .close = drm_gem_vm_close,
34};
35
36static size_t roundup_gem_size(size_t size)
37{
38 return roundup(size, PAGE_SIZE);
39}
40
41void armada_gem_free_object(struct drm_gem_object *obj)
42{
43 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
44 struct armada_private *priv = drm_to_armada_dev(obj->dev);
45
46 DRM_DEBUG_DRIVER("release obj %p\n", dobj);
47
48 drm_gem_free_mmap_offset(&dobj->obj);
49
50 might_lock(&priv->linear_lock);
51
52 if (dobj->page) {
53 /* page backed memory */
54 unsigned int order = get_order(dobj->obj.size);
55 __free_pages(dobj->page, order);
56 } else if (dobj->linear) {
57 /* linear backed memory */
58 mutex_lock(&priv->linear_lock);
59 drm_mm_remove_node(dobj->linear);
60 mutex_unlock(&priv->linear_lock);
61 kfree(dobj->linear);
62 if (dobj->addr)
63 iounmap(dobj->addr);
64 }
65
66 if (dobj->obj.import_attach) {
67 /* We only ever display imported data */
68 if (dobj->sgt)
69 dma_buf_unmap_attachment_unlocked(dobj->obj.import_attach,
70 dobj->sgt, DMA_TO_DEVICE);
71 drm_prime_gem_destroy(&dobj->obj, NULL);
72 }
73
74 drm_gem_object_release(&dobj->obj);
75
76 kfree(dobj);
77}
78
79int
80armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj)
81{
82 struct armada_private *priv = drm_to_armada_dev(dev);
83 size_t size = obj->obj.size;
84
85 if (obj->page || obj->linear)
86 return 0;
87
88 /*
89 * If it is a small allocation (typically cursor, which will
90 * be 32x64 or 64x32 ARGB pixels) try to get it from the system.
91 * Framebuffers will never be this small (our minimum size for
92 * framebuffers is larger than this anyway.) Such objects are
93 * only accessed by the CPU so we don't need any special handing
94 * here.
95 */
96 if (size <= 8192) {
97 unsigned int order = get_order(size);
98 struct page *p = alloc_pages(GFP_KERNEL, order);
99
100 if (p) {
101 obj->addr = page_address(p);
102 obj->phys_addr = page_to_phys(p);
103 obj->page = p;
104
105 memset(obj->addr, 0, PAGE_ALIGN(size));
106 }
107 }
108
109 /*
110 * We could grab something from DMA if it's enabled, but that
111 * involves building in a problem:
112 *
113 * GEM DMA helper interface uses dma_alloc_coherent(), which provides
114 * us with an CPU virtual address and a device address.
115 *
116 * The CPU virtual address may be either an address in the kernel
117 * direct mapped region (for example, as it would be on x86) or
118 * it may be remapped into another part of kernel memory space
119 * (eg, as it would be on ARM.) This means virt_to_phys() on the
120 * returned virtual address is invalid depending on the architecture
121 * implementation.
122 *
123 * The device address may also not be a physical address; it may
124 * be that there is some kind of remapping between the device and
125 * system RAM, which makes the use of the device address also
126 * unsafe to re-use as a physical address.
127 *
128 * This makes DRM usage of dma_alloc_coherent() in a generic way
129 * at best very questionable and unsafe.
130 */
131
132 /* Otherwise, grab it from our linear allocation */
133 if (!obj->page) {
134 struct drm_mm_node *node;
135 unsigned align = min_t(unsigned, size, SZ_2M);
136 void __iomem *ptr;
137 int ret;
138
139 node = kzalloc(sizeof(*node), GFP_KERNEL);
140 if (!node)
141 return -ENOSPC;
142
143 mutex_lock(&priv->linear_lock);
144 ret = drm_mm_insert_node_generic(&priv->linear, node,
145 size, align, 0, 0);
146 mutex_unlock(&priv->linear_lock);
147 if (ret) {
148 kfree(node);
149 return ret;
150 }
151
152 obj->linear = node;
153
154 /* Ensure that the memory we're returning is cleared. */
155 ptr = ioremap_wc(obj->linear->start, size);
156 if (!ptr) {
157 mutex_lock(&priv->linear_lock);
158 drm_mm_remove_node(obj->linear);
159 mutex_unlock(&priv->linear_lock);
160 kfree(obj->linear);
161 obj->linear = NULL;
162 return -ENOMEM;
163 }
164
165 memset_io(ptr, 0, size);
166 iounmap(ptr);
167
168 obj->phys_addr = obj->linear->start;
169 obj->dev_addr = obj->linear->start;
170 obj->mapped = true;
171 }
172
173 DRM_DEBUG_DRIVER("obj %p phys %#llx dev %#llx\n", obj,
174 (unsigned long long)obj->phys_addr,
175 (unsigned long long)obj->dev_addr);
176
177 return 0;
178}
179
180void *
181armada_gem_map_object(struct drm_device *dev, struct armada_gem_object *dobj)
182{
183 /* only linear objects need to be ioremap'd */
184 if (!dobj->addr && dobj->linear)
185 dobj->addr = ioremap_wc(dobj->phys_addr, dobj->obj.size);
186 return dobj->addr;
187}
188
189static const struct drm_gem_object_funcs armada_gem_object_funcs = {
190 .free = armada_gem_free_object,
191 .export = armada_gem_prime_export,
192 .vm_ops = &armada_gem_vm_ops,
193};
194
195struct armada_gem_object *
196armada_gem_alloc_private_object(struct drm_device *dev, size_t size)
197{
198 struct armada_gem_object *obj;
199
200 size = roundup_gem_size(size);
201
202 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
203 if (!obj)
204 return NULL;
205
206 obj->obj.funcs = &armada_gem_object_funcs;
207
208 drm_gem_private_object_init(dev, &obj->obj, size);
209
210 DRM_DEBUG_DRIVER("alloc private obj %p size %zu\n", obj, size);
211
212 return obj;
213}
214
215static 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 obj->obj.funcs = &armada_gem_object_funcs;
228
229 if (drm_gem_object_init(dev, &obj->obj, size)) {
230 kfree(obj);
231 return NULL;
232 }
233
234 mapping = obj->obj.filp->f_mapping;
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 */
243int 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_put(&dobj->obj);
272 return ret;
273}
274
275/* Private driver gem ioctls */
276int armada_gem_create_ioctl(struct drm_device *dev, void *data,
277 struct drm_file *file)
278{
279 struct drm_armada_gem_create *args = data;
280 struct armada_gem_object *dobj;
281 size_t size;
282 u32 handle;
283 int ret;
284
285 if (args->size == 0)
286 return -ENOMEM;
287
288 size = args->size;
289
290 dobj = armada_gem_alloc_object(dev, size);
291 if (dobj == NULL)
292 return -ENOMEM;
293
294 ret = drm_gem_handle_create(file, &dobj->obj, &handle);
295 if (ret)
296 goto err;
297
298 args->handle = handle;
299
300 /* drop reference from allocate - handle holds it now */
301 DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
302 err:
303 drm_gem_object_put(&dobj->obj);
304 return ret;
305}
306
307/* Map a shmem-backed object into process memory space */
308int armada_gem_mmap_ioctl(struct drm_device *dev, void *data,
309 struct drm_file *file)
310{
311 struct drm_armada_gem_mmap *args = data;
312 struct armada_gem_object *dobj;
313 unsigned long addr;
314
315 dobj = armada_gem_object_lookup(file, args->handle);
316 if (dobj == NULL)
317 return -ENOENT;
318
319 if (!dobj->obj.filp) {
320 drm_gem_object_put(&dobj->obj);
321 return -EINVAL;
322 }
323
324 addr = vm_mmap(dobj->obj.filp, 0, args->size, PROT_READ | PROT_WRITE,
325 MAP_SHARED, args->offset);
326 drm_gem_object_put(&dobj->obj);
327 if (IS_ERR_VALUE(addr))
328 return addr;
329
330 args->addr = addr;
331
332 return 0;
333}
334
335int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data,
336 struct drm_file *file)
337{
338 struct drm_armada_gem_pwrite *args = data;
339 struct armada_gem_object *dobj;
340 char __user *ptr;
341 int ret = 0;
342
343 DRM_DEBUG_DRIVER("handle %u off %u size %u ptr 0x%llx\n",
344 args->handle, args->offset, args->size, args->ptr);
345
346 if (args->size == 0)
347 return 0;
348
349 ptr = (char __user *)(uintptr_t)args->ptr;
350
351 if (!access_ok(ptr, args->size))
352 return -EFAULT;
353
354 if (fault_in_readable(ptr, args->size))
355 return -EFAULT;
356
357 dobj = armada_gem_object_lookup(file, args->handle);
358 if (dobj == NULL)
359 return -ENOENT;
360
361 /* Must be a kernel-mapped object */
362 if (!dobj->addr)
363 return -EINVAL;
364
365 if (args->offset > dobj->obj.size ||
366 args->size > dobj->obj.size - args->offset) {
367 DRM_ERROR("invalid size: object size %u\n", dobj->obj.size);
368 ret = -EINVAL;
369 goto unref;
370 }
371
372 if (copy_from_user(dobj->addr + args->offset, ptr, args->size)) {
373 ret = -EFAULT;
374 } else if (dobj->update) {
375 dobj->update(dobj->update_data);
376 ret = 0;
377 }
378
379 unref:
380 drm_gem_object_put(&dobj->obj);
381 return ret;
382}
383
384/* Prime support */
385static struct sg_table *
386armada_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
387 enum dma_data_direction dir)
388{
389 struct drm_gem_object *obj = attach->dmabuf->priv;
390 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
391 struct scatterlist *sg;
392 struct sg_table *sgt;
393 int i;
394
395 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
396 if (!sgt)
397 return NULL;
398
399 if (dobj->obj.filp) {
400 struct address_space *mapping;
401 int count;
402
403 count = dobj->obj.size / PAGE_SIZE;
404 if (sg_alloc_table(sgt, count, GFP_KERNEL))
405 goto free_sgt;
406
407 mapping = dobj->obj.filp->f_mapping;
408
409 for_each_sgtable_sg(sgt, sg, i) {
410 struct page *page;
411
412 page = shmem_read_mapping_page(mapping, i);
413 if (IS_ERR(page))
414 goto release;
415
416 sg_set_page(sg, page, PAGE_SIZE, 0);
417 }
418
419 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
420 goto release;
421 } else if (dobj->page) {
422 /* Single contiguous page */
423 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
424 goto free_sgt;
425
426 sg_set_page(sgt->sgl, dobj->page, dobj->obj.size, 0);
427
428 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
429 goto free_table;
430 } else if (dobj->linear) {
431 /* Single contiguous physical region - no struct page */
432 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
433 goto free_sgt;
434 sg_dma_address(sgt->sgl) = dobj->dev_addr;
435 sg_dma_len(sgt->sgl) = dobj->obj.size;
436 } else {
437 goto free_sgt;
438 }
439 return sgt;
440
441 release:
442 for_each_sgtable_sg(sgt, sg, i)
443 if (sg_page(sg))
444 put_page(sg_page(sg));
445 free_table:
446 sg_free_table(sgt);
447 free_sgt:
448 kfree(sgt);
449 return NULL;
450}
451
452static void armada_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
453 struct sg_table *sgt, enum dma_data_direction dir)
454{
455 struct drm_gem_object *obj = attach->dmabuf->priv;
456 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
457 int i;
458
459 if (!dobj->linear)
460 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
461
462 if (dobj->obj.filp) {
463 struct scatterlist *sg;
464
465 for_each_sgtable_sg(sgt, sg, i)
466 put_page(sg_page(sg));
467 }
468
469 sg_free_table(sgt);
470 kfree(sgt);
471}
472
473static int
474armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
475{
476 return -EINVAL;
477}
478
479static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = {
480 .map_dma_buf = armada_gem_prime_map_dma_buf,
481 .unmap_dma_buf = armada_gem_prime_unmap_dma_buf,
482 .release = drm_gem_dmabuf_release,
483 .mmap = armada_gem_dmabuf_mmap,
484};
485
486struct dma_buf *
487armada_gem_prime_export(struct drm_gem_object *obj, int flags)
488{
489 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
490
491 exp_info.ops = &armada_gem_prime_dmabuf_ops;
492 exp_info.size = obj->size;
493 exp_info.flags = O_RDWR;
494 exp_info.priv = obj;
495
496 return drm_gem_dmabuf_export(obj->dev, &exp_info);
497}
498
499struct drm_gem_object *
500armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf)
501{
502 struct dma_buf_attachment *attach;
503 struct armada_gem_object *dobj;
504
505 if (buf->ops == &armada_gem_prime_dmabuf_ops) {
506 struct drm_gem_object *obj = buf->priv;
507 if (obj->dev == dev) {
508 /*
509 * Importing our own dmabuf(s) increases the
510 * refcount on the gem object itself.
511 */
512 drm_gem_object_get(obj);
513 return obj;
514 }
515 }
516
517 attach = dma_buf_attach(buf, dev->dev);
518 if (IS_ERR(attach))
519 return ERR_CAST(attach);
520
521 dobj = armada_gem_alloc_private_object(dev, buf->size);
522 if (!dobj) {
523 dma_buf_detach(buf, attach);
524 return ERR_PTR(-ENOMEM);
525 }
526
527 dobj->obj.import_attach = attach;
528 get_dma_buf(buf);
529
530 /*
531 * Don't call dma_buf_map_attachment() here - it maps the
532 * scatterlist immediately for DMA, and this is not always
533 * an appropriate thing to do.
534 */
535 return &dobj->obj;
536}
537
538int armada_gem_map_import(struct armada_gem_object *dobj)
539{
540 int ret;
541
542 dobj->sgt = dma_buf_map_attachment_unlocked(dobj->obj.import_attach,
543 DMA_TO_DEVICE);
544 if (IS_ERR(dobj->sgt)) {
545 ret = PTR_ERR(dobj->sgt);
546 dobj->sgt = NULL;
547 DRM_ERROR("dma_buf_map_attachment() error: %d\n", ret);
548 return ret;
549 }
550 if (dobj->sgt->nents > 1) {
551 DRM_ERROR("dma_buf_map_attachment() returned an (unsupported) scattered list\n");
552 return -EINVAL;
553 }
554 if (sg_dma_len(dobj->sgt->sgl) < dobj->obj.size) {
555 DRM_ERROR("dma_buf_map_attachment() returned a small buffer\n");
556 return -EINVAL;
557 }
558 dobj->dev_addr = sg_dma_address(dobj->sgt->sgl);
559 dobj->mapped = true;
560 return 0;
561}