Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* exynos_drm_gem.c
3 *
4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5 * Author: Inki Dae <inki.dae@samsung.com>
6 */
7
8
9#include <linux/dma-buf.h>
10#include <linux/pfn_t.h>
11#include <linux/shmem_fs.h>
12
13#include <drm/drm_prime.h>
14#include <drm/drm_vma_manager.h>
15#include <drm/exynos_drm.h>
16
17#include "exynos_drm_drv.h"
18#include "exynos_drm_gem.h"
19
20static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
21{
22 struct drm_device *dev = exynos_gem->base.dev;
23 unsigned long attr;
24 unsigned int nr_pages;
25 struct sg_table sgt;
26 int ret = -ENOMEM;
27
28 if (exynos_gem->dma_addr) {
29 DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "already allocated.\n");
30 return 0;
31 }
32
33 exynos_gem->dma_attrs = 0;
34
35 /*
36 * if EXYNOS_BO_CONTIG, fully physically contiguous memory
37 * region will be allocated else physically contiguous
38 * as possible.
39 */
40 if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
41 exynos_gem->dma_attrs |= DMA_ATTR_FORCE_CONTIGUOUS;
42
43 /*
44 * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
45 * else cachable mapping.
46 */
47 if (exynos_gem->flags & EXYNOS_BO_WC ||
48 !(exynos_gem->flags & EXYNOS_BO_CACHABLE))
49 attr = DMA_ATTR_WRITE_COMBINE;
50 else
51 attr = DMA_ATTR_NON_CONSISTENT;
52
53 exynos_gem->dma_attrs |= attr;
54 exynos_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
55
56 nr_pages = exynos_gem->size >> PAGE_SHIFT;
57
58 exynos_gem->pages = kvmalloc_array(nr_pages, sizeof(struct page *),
59 GFP_KERNEL | __GFP_ZERO);
60 if (!exynos_gem->pages) {
61 DRM_DEV_ERROR(to_dma_dev(dev), "failed to allocate pages.\n");
62 return -ENOMEM;
63 }
64
65 exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
66 &exynos_gem->dma_addr, GFP_KERNEL,
67 exynos_gem->dma_attrs);
68 if (!exynos_gem->cookie) {
69 DRM_DEV_ERROR(to_dma_dev(dev), "failed to allocate buffer.\n");
70 goto err_free;
71 }
72
73 ret = dma_get_sgtable_attrs(to_dma_dev(dev), &sgt, exynos_gem->cookie,
74 exynos_gem->dma_addr, exynos_gem->size,
75 exynos_gem->dma_attrs);
76 if (ret < 0) {
77 DRM_DEV_ERROR(to_dma_dev(dev), "failed to get sgtable.\n");
78 goto err_dma_free;
79 }
80
81 if (drm_prime_sg_to_page_addr_arrays(&sgt, exynos_gem->pages, NULL,
82 nr_pages)) {
83 DRM_DEV_ERROR(to_dma_dev(dev), "invalid sgtable.\n");
84 ret = -EINVAL;
85 goto err_sgt_free;
86 }
87
88 sg_free_table(&sgt);
89
90 DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "dma_addr(0x%lx), size(0x%lx)\n",
91 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
92
93 return 0;
94
95err_sgt_free:
96 sg_free_table(&sgt);
97err_dma_free:
98 dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
99 exynos_gem->dma_addr, exynos_gem->dma_attrs);
100err_free:
101 kvfree(exynos_gem->pages);
102
103 return ret;
104}
105
106static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
107{
108 struct drm_device *dev = exynos_gem->base.dev;
109
110 if (!exynos_gem->dma_addr) {
111 DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr is invalid.\n");
112 return;
113 }
114
115 DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr(0x%lx), size(0x%lx)\n",
116 (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
117
118 dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
119 (dma_addr_t)exynos_gem->dma_addr,
120 exynos_gem->dma_attrs);
121
122 kvfree(exynos_gem->pages);
123}
124
125static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
126 struct drm_file *file_priv,
127 unsigned int *handle)
128{
129 int ret;
130
131 /*
132 * allocate a id of idr table where the obj is registered
133 * and handle has the id what user can see.
134 */
135 ret = drm_gem_handle_create(file_priv, obj, handle);
136 if (ret)
137 return ret;
138
139 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "gem handle = 0x%x\n", *handle);
140
141 /* drop reference from allocate - handle holds it now. */
142 drm_gem_object_put_unlocked(obj);
143
144 return 0;
145}
146
147void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
148{
149 struct drm_gem_object *obj = &exynos_gem->base;
150
151 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "handle count = %d\n",
152 obj->handle_count);
153
154 /*
155 * do not release memory region from exporter.
156 *
157 * the region will be released by exporter
158 * once dmabuf's refcount becomes 0.
159 */
160 if (obj->import_attach)
161 drm_prime_gem_destroy(obj, exynos_gem->sgt);
162 else
163 exynos_drm_free_buf(exynos_gem);
164
165 /* release file pointer to gem object. */
166 drm_gem_object_release(obj);
167
168 kfree(exynos_gem);
169}
170
171static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
172 unsigned long size)
173{
174 struct exynos_drm_gem *exynos_gem;
175 struct drm_gem_object *obj;
176 int ret;
177
178 exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL);
179 if (!exynos_gem)
180 return ERR_PTR(-ENOMEM);
181
182 exynos_gem->size = size;
183 obj = &exynos_gem->base;
184
185 ret = drm_gem_object_init(dev, obj, size);
186 if (ret < 0) {
187 DRM_DEV_ERROR(dev->dev, "failed to initialize gem object\n");
188 kfree(exynos_gem);
189 return ERR_PTR(ret);
190 }
191
192 ret = drm_gem_create_mmap_offset(obj);
193 if (ret < 0) {
194 drm_gem_object_release(obj);
195 kfree(exynos_gem);
196 return ERR_PTR(ret);
197 }
198
199 DRM_DEV_DEBUG_KMS(dev->dev, "created file object = %pK\n", obj->filp);
200
201 return exynos_gem;
202}
203
204struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
205 unsigned int flags,
206 unsigned long size)
207{
208 struct exynos_drm_gem *exynos_gem;
209 int ret;
210
211 if (flags & ~(EXYNOS_BO_MASK)) {
212 DRM_DEV_ERROR(dev->dev,
213 "invalid GEM buffer flags: %u\n", flags);
214 return ERR_PTR(-EINVAL);
215 }
216
217 if (!size) {
218 DRM_DEV_ERROR(dev->dev, "invalid GEM buffer size: %lu\n", size);
219 return ERR_PTR(-EINVAL);
220 }
221
222 size = roundup(size, PAGE_SIZE);
223
224 exynos_gem = exynos_drm_gem_init(dev, size);
225 if (IS_ERR(exynos_gem))
226 return exynos_gem;
227
228 if (!is_drm_iommu_supported(dev) && (flags & EXYNOS_BO_NONCONTIG)) {
229 /*
230 * when no IOMMU is available, all allocated buffers are
231 * contiguous anyway, so drop EXYNOS_BO_NONCONTIG flag
232 */
233 flags &= ~EXYNOS_BO_NONCONTIG;
234 DRM_WARN("Non-contiguous allocation is not supported without IOMMU, falling back to contiguous buffer\n");
235 }
236
237 /* set memory type and cache attribute from user side. */
238 exynos_gem->flags = flags;
239
240 ret = exynos_drm_alloc_buf(exynos_gem);
241 if (ret < 0) {
242 drm_gem_object_release(&exynos_gem->base);
243 kfree(exynos_gem);
244 return ERR_PTR(ret);
245 }
246
247 return exynos_gem;
248}
249
250int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
251 struct drm_file *file_priv)
252{
253 struct drm_exynos_gem_create *args = data;
254 struct exynos_drm_gem *exynos_gem;
255 int ret;
256
257 exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size);
258 if (IS_ERR(exynos_gem))
259 return PTR_ERR(exynos_gem);
260
261 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
262 &args->handle);
263 if (ret) {
264 exynos_drm_gem_destroy(exynos_gem);
265 return ret;
266 }
267
268 return 0;
269}
270
271int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
272 struct drm_file *file_priv)
273{
274 struct drm_exynos_gem_map *args = data;
275
276 return drm_gem_dumb_map_offset(file_priv, dev, args->handle,
277 &args->offset);
278}
279
280struct exynos_drm_gem *exynos_drm_gem_get(struct drm_file *filp,
281 unsigned int gem_handle)
282{
283 struct drm_gem_object *obj;
284
285 obj = drm_gem_object_lookup(filp, gem_handle);
286 if (!obj)
287 return NULL;
288 return to_exynos_gem(obj);
289}
290
291static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
292 struct vm_area_struct *vma)
293{
294 struct drm_device *drm_dev = exynos_gem->base.dev;
295 unsigned long vm_size;
296 int ret;
297
298 vma->vm_flags &= ~VM_PFNMAP;
299 vma->vm_pgoff = 0;
300
301 vm_size = vma->vm_end - vma->vm_start;
302
303 /* check if user-requested size is valid. */
304 if (vm_size > exynos_gem->size)
305 return -EINVAL;
306
307 ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
308 exynos_gem->dma_addr, exynos_gem->size,
309 exynos_gem->dma_attrs);
310 if (ret < 0) {
311 DRM_ERROR("failed to mmap.\n");
312 return ret;
313 }
314
315 return 0;
316}
317
318int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
319 struct drm_file *file_priv)
320{
321 struct exynos_drm_gem *exynos_gem;
322 struct drm_exynos_gem_info *args = data;
323 struct drm_gem_object *obj;
324
325 obj = drm_gem_object_lookup(file_priv, args->handle);
326 if (!obj) {
327 DRM_DEV_ERROR(dev->dev, "failed to lookup gem object.\n");
328 return -EINVAL;
329 }
330
331 exynos_gem = to_exynos_gem(obj);
332
333 args->flags = exynos_gem->flags;
334 args->size = exynos_gem->size;
335
336 drm_gem_object_put_unlocked(obj);
337
338 return 0;
339}
340
341void exynos_drm_gem_free_object(struct drm_gem_object *obj)
342{
343 exynos_drm_gem_destroy(to_exynos_gem(obj));
344}
345
346int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
347 struct drm_device *dev,
348 struct drm_mode_create_dumb *args)
349{
350 struct exynos_drm_gem *exynos_gem;
351 unsigned int flags;
352 int ret;
353
354 /*
355 * allocate memory to be used for framebuffer.
356 * - this callback would be called by user application
357 * with DRM_IOCTL_MODE_CREATE_DUMB command.
358 */
359
360 args->pitch = args->width * ((args->bpp + 7) / 8);
361 args->size = args->pitch * args->height;
362
363 if (is_drm_iommu_supported(dev))
364 flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
365 else
366 flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
367
368 exynos_gem = exynos_drm_gem_create(dev, flags, args->size);
369 if (IS_ERR(exynos_gem)) {
370 dev_warn(dev->dev, "FB allocation failed.\n");
371 return PTR_ERR(exynos_gem);
372 }
373
374 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
375 &args->handle);
376 if (ret) {
377 exynos_drm_gem_destroy(exynos_gem);
378 return ret;
379 }
380
381 return 0;
382}
383
384vm_fault_t exynos_drm_gem_fault(struct vm_fault *vmf)
385{
386 struct vm_area_struct *vma = vmf->vma;
387 struct drm_gem_object *obj = vma->vm_private_data;
388 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
389 unsigned long pfn;
390 pgoff_t page_offset;
391
392 page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
393
394 if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
395 DRM_ERROR("invalid page offset\n");
396 return VM_FAULT_SIGBUS;
397 }
398
399 pfn = page_to_pfn(exynos_gem->pages[page_offset]);
400 return vmf_insert_mixed(vma, vmf->address,
401 __pfn_to_pfn_t(pfn, PFN_DEV));
402}
403
404static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
405 struct vm_area_struct *vma)
406{
407 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
408 int ret;
409
410 DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "flags = 0x%x\n",
411 exynos_gem->flags);
412
413 /* non-cachable as default. */
414 if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
415 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
416 else if (exynos_gem->flags & EXYNOS_BO_WC)
417 vma->vm_page_prot =
418 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
419 else
420 vma->vm_page_prot =
421 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
422
423 ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
424 if (ret)
425 goto err_close_vm;
426
427 return ret;
428
429err_close_vm:
430 drm_gem_vm_close(vma);
431
432 return ret;
433}
434
435int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
436{
437 struct drm_gem_object *obj;
438 int ret;
439
440 /* set vm_area_struct. */
441 ret = drm_gem_mmap(filp, vma);
442 if (ret < 0) {
443 DRM_ERROR("failed to mmap.\n");
444 return ret;
445 }
446
447 obj = vma->vm_private_data;
448
449 if (obj->import_attach)
450 return dma_buf_mmap(obj->dma_buf, vma, 0);
451
452 return exynos_drm_gem_mmap_obj(obj, vma);
453}
454
455/* low-level interface prime helpers */
456struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
457 struct dma_buf *dma_buf)
458{
459 return drm_gem_prime_import_dev(dev, dma_buf, to_dma_dev(dev));
460}
461
462struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
463{
464 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
465 int npages;
466
467 npages = exynos_gem->size >> PAGE_SHIFT;
468
469 return drm_prime_pages_to_sg(exynos_gem->pages, npages);
470}
471
472struct drm_gem_object *
473exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
474 struct dma_buf_attachment *attach,
475 struct sg_table *sgt)
476{
477 struct exynos_drm_gem *exynos_gem;
478 int npages;
479 int ret;
480
481 exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
482 if (IS_ERR(exynos_gem)) {
483 ret = PTR_ERR(exynos_gem);
484 return ERR_PTR(ret);
485 }
486
487 exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
488
489 npages = exynos_gem->size >> PAGE_SHIFT;
490 exynos_gem->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
491 if (!exynos_gem->pages) {
492 ret = -ENOMEM;
493 goto err;
494 }
495
496 ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL,
497 npages);
498 if (ret < 0)
499 goto err_free_large;
500
501 exynos_gem->sgt = sgt;
502
503 if (sgt->nents == 1) {
504 /* always physically continuous memory if sgt->nents is 1. */
505 exynos_gem->flags |= EXYNOS_BO_CONTIG;
506 } else {
507 /*
508 * this case could be CONTIG or NONCONTIG type but for now
509 * sets NONCONTIG.
510 * TODO. we have to find a way that exporter can notify
511 * the type of its own buffer to importer.
512 */
513 exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
514 }
515
516 return &exynos_gem->base;
517
518err_free_large:
519 kvfree(exynos_gem->pages);
520err:
521 drm_gem_object_release(&exynos_gem->base);
522 kfree(exynos_gem);
523 return ERR_PTR(ret);
524}
525
526void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
527{
528 return NULL;
529}
530
531void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
532{
533 /* Nothing to do */
534}
535
536int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
537 struct vm_area_struct *vma)
538{
539 int ret;
540
541 ret = drm_gem_mmap_obj(obj, obj->size, vma);
542 if (ret < 0)
543 return ret;
544
545 return exynos_drm_gem_mmap_obj(obj, vma);
546}
1/* exynos_drm_gem.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Author: Inki Dae <inki.dae@samsung.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11
12#include <drm/drmP.h>
13#include <drm/drm_vma_manager.h>
14
15#include <linux/shmem_fs.h>
16#include <drm/exynos_drm.h>
17
18#include "exynos_drm_drv.h"
19#include "exynos_drm_gem.h"
20#include "exynos_drm_buf.h"
21#include "exynos_drm_iommu.h"
22
23static unsigned int convert_to_vm_err_msg(int msg)
24{
25 unsigned int out_msg;
26
27 switch (msg) {
28 case 0:
29 case -ERESTARTSYS:
30 case -EINTR:
31 out_msg = VM_FAULT_NOPAGE;
32 break;
33
34 case -ENOMEM:
35 out_msg = VM_FAULT_OOM;
36 break;
37
38 default:
39 out_msg = VM_FAULT_SIGBUS;
40 break;
41 }
42
43 return out_msg;
44}
45
46static int check_gem_flags(unsigned int flags)
47{
48 if (flags & ~(EXYNOS_BO_MASK)) {
49 DRM_ERROR("invalid flags.\n");
50 return -EINVAL;
51 }
52
53 return 0;
54}
55
56static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
57 struct vm_area_struct *vma)
58{
59 DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
60
61 /* non-cachable as default. */
62 if (obj->flags & EXYNOS_BO_CACHABLE)
63 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
64 else if (obj->flags & EXYNOS_BO_WC)
65 vma->vm_page_prot =
66 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
67 else
68 vma->vm_page_prot =
69 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
70}
71
72static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
73{
74 /* TODO */
75
76 return roundup(size, PAGE_SIZE);
77}
78
79static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
80 struct vm_area_struct *vma,
81 unsigned long f_vaddr,
82 pgoff_t page_offset)
83{
84 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
85 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
86 struct scatterlist *sgl;
87 unsigned long pfn;
88 int i;
89
90 if (!buf->sgt)
91 return -EINTR;
92
93 if (page_offset >= (buf->size >> PAGE_SHIFT)) {
94 DRM_ERROR("invalid page offset\n");
95 return -EINVAL;
96 }
97
98 sgl = buf->sgt->sgl;
99 for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
100 if (page_offset < (sgl->length >> PAGE_SHIFT))
101 break;
102 page_offset -= (sgl->length >> PAGE_SHIFT);
103 }
104
105 pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
106
107 return vm_insert_mixed(vma, f_vaddr, pfn);
108}
109
110static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
111 struct drm_file *file_priv,
112 unsigned int *handle)
113{
114 int ret;
115
116 /*
117 * allocate a id of idr table where the obj is registered
118 * and handle has the id what user can see.
119 */
120 ret = drm_gem_handle_create(file_priv, obj, handle);
121 if (ret)
122 return ret;
123
124 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
125
126 /* drop reference from allocate - handle holds it now. */
127 drm_gem_object_unreference_unlocked(obj);
128
129 return 0;
130}
131
132void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
133{
134 struct drm_gem_object *obj;
135 struct exynos_drm_gem_buf *buf;
136
137 obj = &exynos_gem_obj->base;
138 buf = exynos_gem_obj->buffer;
139
140 DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
141
142 /*
143 * do not release memory region from exporter.
144 *
145 * the region will be released by exporter
146 * once dmabuf's refcount becomes 0.
147 */
148 if (obj->import_attach)
149 goto out;
150
151 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
152
153out:
154 exynos_drm_fini_buf(obj->dev, buf);
155 exynos_gem_obj->buffer = NULL;
156
157 drm_gem_free_mmap_offset(obj);
158
159 /* release file pointer to gem object. */
160 drm_gem_object_release(obj);
161
162 kfree(exynos_gem_obj);
163 exynos_gem_obj = NULL;
164}
165
166unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
167 unsigned int gem_handle,
168 struct drm_file *file_priv)
169{
170 struct exynos_drm_gem_obj *exynos_gem_obj;
171 struct drm_gem_object *obj;
172
173 obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
174 if (!obj) {
175 DRM_ERROR("failed to lookup gem object.\n");
176 return 0;
177 }
178
179 exynos_gem_obj = to_exynos_gem_obj(obj);
180
181 drm_gem_object_unreference_unlocked(obj);
182
183 return exynos_gem_obj->buffer->size;
184}
185
186
187struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
188 unsigned long size)
189{
190 struct exynos_drm_gem_obj *exynos_gem_obj;
191 struct drm_gem_object *obj;
192 int ret;
193
194 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
195 if (!exynos_gem_obj)
196 return NULL;
197
198 exynos_gem_obj->size = size;
199 obj = &exynos_gem_obj->base;
200
201 ret = drm_gem_object_init(dev, obj, size);
202 if (ret < 0) {
203 DRM_ERROR("failed to initialize gem object\n");
204 kfree(exynos_gem_obj);
205 return NULL;
206 }
207
208 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
209
210 return exynos_gem_obj;
211}
212
213struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
214 unsigned int flags,
215 unsigned long size)
216{
217 struct exynos_drm_gem_obj *exynos_gem_obj;
218 struct exynos_drm_gem_buf *buf;
219 int ret;
220
221 if (!size) {
222 DRM_ERROR("invalid size.\n");
223 return ERR_PTR(-EINVAL);
224 }
225
226 size = roundup_gem_size(size, flags);
227
228 ret = check_gem_flags(flags);
229 if (ret)
230 return ERR_PTR(ret);
231
232 buf = exynos_drm_init_buf(dev, size);
233 if (!buf)
234 return ERR_PTR(-ENOMEM);
235
236 exynos_gem_obj = exynos_drm_gem_init(dev, size);
237 if (!exynos_gem_obj) {
238 ret = -ENOMEM;
239 goto err_fini_buf;
240 }
241
242 exynos_gem_obj->buffer = buf;
243
244 /* set memory type and cache attribute from user side. */
245 exynos_gem_obj->flags = flags;
246
247 ret = exynos_drm_alloc_buf(dev, buf, flags);
248 if (ret < 0)
249 goto err_gem_fini;
250
251 return exynos_gem_obj;
252
253err_gem_fini:
254 drm_gem_object_release(&exynos_gem_obj->base);
255 kfree(exynos_gem_obj);
256err_fini_buf:
257 exynos_drm_fini_buf(dev, buf);
258 return ERR_PTR(ret);
259}
260
261int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
262 struct drm_file *file_priv)
263{
264 struct drm_exynos_gem_create *args = data;
265 struct exynos_drm_gem_obj *exynos_gem_obj;
266 int ret;
267
268 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
269 if (IS_ERR(exynos_gem_obj))
270 return PTR_ERR(exynos_gem_obj);
271
272 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
273 &args->handle);
274 if (ret) {
275 exynos_drm_gem_destroy(exynos_gem_obj);
276 return ret;
277 }
278
279 return 0;
280}
281
282dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
283 unsigned int gem_handle,
284 struct drm_file *filp)
285{
286 struct exynos_drm_gem_obj *exynos_gem_obj;
287 struct drm_gem_object *obj;
288
289 obj = drm_gem_object_lookup(dev, filp, gem_handle);
290 if (!obj) {
291 DRM_ERROR("failed to lookup gem object.\n");
292 return ERR_PTR(-EINVAL);
293 }
294
295 exynos_gem_obj = to_exynos_gem_obj(obj);
296
297 return &exynos_gem_obj->buffer->dma_addr;
298}
299
300void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
301 unsigned int gem_handle,
302 struct drm_file *filp)
303{
304 struct exynos_drm_gem_obj *exynos_gem_obj;
305 struct drm_gem_object *obj;
306
307 obj = drm_gem_object_lookup(dev, filp, gem_handle);
308 if (!obj) {
309 DRM_ERROR("failed to lookup gem object.\n");
310 return;
311 }
312
313 exynos_gem_obj = to_exynos_gem_obj(obj);
314
315 drm_gem_object_unreference_unlocked(obj);
316
317 /*
318 * decrease obj->refcount one more time because we has already
319 * increased it at exynos_drm_gem_get_dma_addr().
320 */
321 drm_gem_object_unreference_unlocked(obj);
322}
323
324int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
325 struct drm_file *file_priv)
326{
327 struct drm_exynos_gem_map_off *args = data;
328
329 DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
330 args->handle, (unsigned long)args->offset);
331
332 if (!(dev->driver->driver_features & DRIVER_GEM)) {
333 DRM_ERROR("does not support GEM.\n");
334 return -ENODEV;
335 }
336
337 return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
338 &args->offset);
339}
340
341int exynos_drm_gem_mmap_buffer(struct file *filp,
342 struct vm_area_struct *vma)
343{
344 struct drm_gem_object *obj = filp->private_data;
345 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
346 struct drm_device *drm_dev = obj->dev;
347 struct exynos_drm_gem_buf *buffer;
348 unsigned long vm_size;
349 int ret;
350
351 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
352
353 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
354 vma->vm_private_data = obj;
355 vma->vm_ops = drm_dev->driver->gem_vm_ops;
356
357 update_vm_cache_attr(exynos_gem_obj, vma);
358
359 vm_size = vma->vm_end - vma->vm_start;
360
361 /*
362 * a buffer contains information to physically continuous memory
363 * allocated by user request or at framebuffer creation.
364 */
365 buffer = exynos_gem_obj->buffer;
366
367 /* check if user-requested size is valid. */
368 if (vm_size > buffer->size)
369 return -EINVAL;
370
371 ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
372 buffer->dma_addr, buffer->size,
373 &buffer->dma_attrs);
374 if (ret < 0) {
375 DRM_ERROR("failed to mmap.\n");
376 return ret;
377 }
378
379 /*
380 * take a reference to this mapping of the object. And this reference
381 * is unreferenced by the corresponding vm_close call.
382 */
383 drm_gem_object_reference(obj);
384
385 drm_vm_open_locked(drm_dev, vma);
386
387 return 0;
388}
389
390int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
391 struct drm_file *file_priv)
392{
393 struct drm_exynos_file_private *exynos_file_priv;
394 struct drm_exynos_gem_mmap *args = data;
395 struct drm_gem_object *obj;
396 struct file *anon_filp;
397 unsigned long addr;
398
399 if (!(dev->driver->driver_features & DRIVER_GEM)) {
400 DRM_ERROR("does not support GEM.\n");
401 return -ENODEV;
402 }
403
404 mutex_lock(&dev->struct_mutex);
405
406 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
407 if (!obj) {
408 DRM_ERROR("failed to lookup gem object.\n");
409 mutex_unlock(&dev->struct_mutex);
410 return -EINVAL;
411 }
412
413 exynos_file_priv = file_priv->driver_priv;
414 anon_filp = exynos_file_priv->anon_filp;
415 anon_filp->private_data = obj;
416
417 addr = vm_mmap(anon_filp, 0, args->size, PROT_READ | PROT_WRITE,
418 MAP_SHARED, 0);
419
420 drm_gem_object_unreference(obj);
421
422 if (IS_ERR_VALUE(addr)) {
423 mutex_unlock(&dev->struct_mutex);
424 return (int)addr;
425 }
426
427 mutex_unlock(&dev->struct_mutex);
428
429 args->mapped = addr;
430
431 DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
432
433 return 0;
434}
435
436int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
437 struct drm_file *file_priv)
438{ struct exynos_drm_gem_obj *exynos_gem_obj;
439 struct drm_exynos_gem_info *args = data;
440 struct drm_gem_object *obj;
441
442 mutex_lock(&dev->struct_mutex);
443
444 obj = drm_gem_object_lookup(dev, file_priv, args->handle);
445 if (!obj) {
446 DRM_ERROR("failed to lookup gem object.\n");
447 mutex_unlock(&dev->struct_mutex);
448 return -EINVAL;
449 }
450
451 exynos_gem_obj = to_exynos_gem_obj(obj);
452
453 args->flags = exynos_gem_obj->flags;
454 args->size = exynos_gem_obj->size;
455
456 drm_gem_object_unreference(obj);
457 mutex_unlock(&dev->struct_mutex);
458
459 return 0;
460}
461
462struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
463{
464 struct vm_area_struct *vma_copy;
465
466 vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
467 if (!vma_copy)
468 return NULL;
469
470 if (vma->vm_ops && vma->vm_ops->open)
471 vma->vm_ops->open(vma);
472
473 if (vma->vm_file)
474 get_file(vma->vm_file);
475
476 memcpy(vma_copy, vma, sizeof(*vma));
477
478 vma_copy->vm_mm = NULL;
479 vma_copy->vm_next = NULL;
480 vma_copy->vm_prev = NULL;
481
482 return vma_copy;
483}
484
485void exynos_gem_put_vma(struct vm_area_struct *vma)
486{
487 if (!vma)
488 return;
489
490 if (vma->vm_ops && vma->vm_ops->close)
491 vma->vm_ops->close(vma);
492
493 if (vma->vm_file)
494 fput(vma->vm_file);
495
496 kfree(vma);
497}
498
499int exynos_gem_get_pages_from_userptr(unsigned long start,
500 unsigned int npages,
501 struct page **pages,
502 struct vm_area_struct *vma)
503{
504 int get_npages;
505
506 /* the memory region mmaped with VM_PFNMAP. */
507 if (vma_is_io(vma)) {
508 unsigned int i;
509
510 for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
511 unsigned long pfn;
512 int ret = follow_pfn(vma, start, &pfn);
513 if (ret)
514 return ret;
515
516 pages[i] = pfn_to_page(pfn);
517 }
518
519 if (i != npages) {
520 DRM_ERROR("failed to get user_pages.\n");
521 return -EINVAL;
522 }
523
524 return 0;
525 }
526
527 get_npages = get_user_pages(current, current->mm, start,
528 npages, 1, 1, pages, NULL);
529 get_npages = max(get_npages, 0);
530 if (get_npages != npages) {
531 DRM_ERROR("failed to get user_pages.\n");
532 while (get_npages)
533 put_page(pages[--get_npages]);
534 return -EFAULT;
535 }
536
537 return 0;
538}
539
540void exynos_gem_put_pages_to_userptr(struct page **pages,
541 unsigned int npages,
542 struct vm_area_struct *vma)
543{
544 if (!vma_is_io(vma)) {
545 unsigned int i;
546
547 for (i = 0; i < npages; i++) {
548 set_page_dirty_lock(pages[i]);
549
550 /*
551 * undo the reference we took when populating
552 * the table.
553 */
554 put_page(pages[i]);
555 }
556 }
557}
558
559int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
560 struct sg_table *sgt,
561 enum dma_data_direction dir)
562{
563 int nents;
564
565 mutex_lock(&drm_dev->struct_mutex);
566
567 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
568 if (!nents) {
569 DRM_ERROR("failed to map sgl with dma.\n");
570 mutex_unlock(&drm_dev->struct_mutex);
571 return nents;
572 }
573
574 mutex_unlock(&drm_dev->struct_mutex);
575 return 0;
576}
577
578void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
579 struct sg_table *sgt,
580 enum dma_data_direction dir)
581{
582 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
583}
584
585void exynos_drm_gem_free_object(struct drm_gem_object *obj)
586{
587 struct exynos_drm_gem_obj *exynos_gem_obj;
588 struct exynos_drm_gem_buf *buf;
589
590 exynos_gem_obj = to_exynos_gem_obj(obj);
591 buf = exynos_gem_obj->buffer;
592
593 if (obj->import_attach)
594 drm_prime_gem_destroy(obj, buf->sgt);
595
596 exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
597}
598
599int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
600 struct drm_device *dev,
601 struct drm_mode_create_dumb *args)
602{
603 struct exynos_drm_gem_obj *exynos_gem_obj;
604 int ret;
605
606 /*
607 * allocate memory to be used for framebuffer.
608 * - this callback would be called by user application
609 * with DRM_IOCTL_MODE_CREATE_DUMB command.
610 */
611
612 args->pitch = args->width * ((args->bpp + 7) / 8);
613 args->size = args->pitch * args->height;
614
615 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG |
616 EXYNOS_BO_WC, args->size);
617 /*
618 * If physically contiguous memory allocation fails and if IOMMU is
619 * supported then try to get buffer from non physically contiguous
620 * memory area.
621 */
622 if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
623 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
624 exynos_gem_obj = exynos_drm_gem_create(dev,
625 EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
626 args->size);
627 }
628
629 if (IS_ERR(exynos_gem_obj))
630 return PTR_ERR(exynos_gem_obj);
631
632 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
633 &args->handle);
634 if (ret) {
635 exynos_drm_gem_destroy(exynos_gem_obj);
636 return ret;
637 }
638
639 return 0;
640}
641
642int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
643 struct drm_device *dev, uint32_t handle,
644 uint64_t *offset)
645{
646 struct drm_gem_object *obj;
647 int ret = 0;
648
649 mutex_lock(&dev->struct_mutex);
650
651 /*
652 * get offset of memory allocated for drm framebuffer.
653 * - this callback would be called by user application
654 * with DRM_IOCTL_MODE_MAP_DUMB command.
655 */
656
657 obj = drm_gem_object_lookup(dev, file_priv, handle);
658 if (!obj) {
659 DRM_ERROR("failed to lookup gem object.\n");
660 ret = -EINVAL;
661 goto unlock;
662 }
663
664 ret = drm_gem_create_mmap_offset(obj);
665 if (ret)
666 goto out;
667
668 *offset = drm_vma_node_offset_addr(&obj->vma_node);
669 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
670
671out:
672 drm_gem_object_unreference(obj);
673unlock:
674 mutex_unlock(&dev->struct_mutex);
675 return ret;
676}
677
678int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
679{
680 struct drm_gem_object *obj = vma->vm_private_data;
681 struct drm_device *dev = obj->dev;
682 unsigned long f_vaddr;
683 pgoff_t page_offset;
684 int ret;
685
686 page_offset = ((unsigned long)vmf->virtual_address -
687 vma->vm_start) >> PAGE_SHIFT;
688 f_vaddr = (unsigned long)vmf->virtual_address;
689
690 mutex_lock(&dev->struct_mutex);
691
692 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
693 if (ret < 0)
694 DRM_ERROR("failed to map a buffer with user.\n");
695
696 mutex_unlock(&dev->struct_mutex);
697
698 return convert_to_vm_err_msg(ret);
699}
700
701int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
702{
703 struct exynos_drm_gem_obj *exynos_gem_obj;
704 struct drm_gem_object *obj;
705 int ret;
706
707 /* set vm_area_struct. */
708 ret = drm_gem_mmap(filp, vma);
709 if (ret < 0) {
710 DRM_ERROR("failed to mmap.\n");
711 return ret;
712 }
713
714 obj = vma->vm_private_data;
715 exynos_gem_obj = to_exynos_gem_obj(obj);
716
717 ret = check_gem_flags(exynos_gem_obj->flags);
718 if (ret) {
719 drm_gem_vm_close(vma);
720 drm_gem_free_mmap_offset(obj);
721 return ret;
722 }
723
724 vma->vm_flags &= ~VM_PFNMAP;
725 vma->vm_flags |= VM_MIXEDMAP;
726
727 update_vm_cache_attr(exynos_gem_obj, vma);
728
729 return ret;
730}