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1/*
2 * Copyright 2011 Red Hat, Inc.
3 * Copyright © 2014 The Chromium OS Authors
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software")
7 * to deal in the software without restriction, including without limitation
8 * on the rights to use, copy, modify, merge, publish, distribute, sub
9 * license, and/or sell copies of the Software, and to permit persons to whom
10 * them Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTIBILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER
20 * IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Adam Jackson <ajax@redhat.com>
25 * Ben Widawsky <ben@bwidawsk.net>
26 */
27
28/**
29 * This is vgem, a (non-hardware-backed) GEM service. This is used by Mesa's
30 * software renderer and the X server for efficient buffer sharing.
31 */
32
33#include <linux/module.h>
34#include <linux/ramfs.h>
35#include <linux/shmem_fs.h>
36#include <linux/dma-buf.h>
37#include "vgem_drv.h"
38
39#define DRIVER_NAME "vgem"
40#define DRIVER_DESC "Virtual GEM provider"
41#define DRIVER_DATE "20120112"
42#define DRIVER_MAJOR 1
43#define DRIVER_MINOR 0
44
45void vgem_gem_put_pages(struct drm_vgem_gem_object *obj)
46{
47 drm_gem_put_pages(&obj->base, obj->pages, false, false);
48 obj->pages = NULL;
49}
50
51static void vgem_gem_free_object(struct drm_gem_object *obj)
52{
53 struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);
54
55 drm_gem_free_mmap_offset(obj);
56
57 if (vgem_obj->use_dma_buf && obj->dma_buf) {
58 dma_buf_put(obj->dma_buf);
59 obj->dma_buf = NULL;
60 }
61
62 drm_gem_object_release(obj);
63
64 if (vgem_obj->pages)
65 vgem_gem_put_pages(vgem_obj);
66
67 vgem_obj->pages = NULL;
68
69 kfree(vgem_obj);
70}
71
72int vgem_gem_get_pages(struct drm_vgem_gem_object *obj)
73{
74 struct page **pages;
75
76 if (obj->pages || obj->use_dma_buf)
77 return 0;
78
79 pages = drm_gem_get_pages(&obj->base);
80 if (IS_ERR(pages)) {
81 return PTR_ERR(pages);
82 }
83
84 obj->pages = pages;
85
86 return 0;
87}
88
89static int vgem_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
90{
91 struct drm_vgem_gem_object *obj = vma->vm_private_data;
92 struct drm_device *dev = obj->base.dev;
93 loff_t num_pages;
94 pgoff_t page_offset;
95 int ret;
96
97 /* We don't use vmf->pgoff since that has the fake offset */
98 page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
99 PAGE_SHIFT;
100
101 num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE);
102
103 if (page_offset > num_pages)
104 return VM_FAULT_SIGBUS;
105
106 mutex_lock(&dev->struct_mutex);
107
108 ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address,
109 obj->pages[page_offset]);
110
111 mutex_unlock(&dev->struct_mutex);
112 switch (ret) {
113 case 0:
114 return VM_FAULT_NOPAGE;
115 case -ENOMEM:
116 return VM_FAULT_OOM;
117 case -EBUSY:
118 return VM_FAULT_RETRY;
119 case -EFAULT:
120 case -EINVAL:
121 return VM_FAULT_SIGBUS;
122 default:
123 WARN_ON(1);
124 return VM_FAULT_SIGBUS;
125 }
126}
127
128static const struct vm_operations_struct vgem_gem_vm_ops = {
129 .fault = vgem_gem_fault,
130 .open = drm_gem_vm_open,
131 .close = drm_gem_vm_close,
132};
133
134/* ioctls */
135
136static struct drm_gem_object *vgem_gem_create(struct drm_device *dev,
137 struct drm_file *file,
138 unsigned int *handle,
139 unsigned long size)
140{
141 struct drm_vgem_gem_object *obj;
142 struct drm_gem_object *gem_object;
143 int err;
144
145 size = roundup(size, PAGE_SIZE);
146
147 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
148 if (!obj)
149 return ERR_PTR(-ENOMEM);
150
151 gem_object = &obj->base;
152
153 err = drm_gem_object_init(dev, gem_object, size);
154 if (err)
155 goto out;
156
157 err = drm_gem_handle_create(file, gem_object, handle);
158 if (err)
159 goto handle_out;
160
161 drm_gem_object_unreference_unlocked(gem_object);
162
163 return gem_object;
164
165handle_out:
166 drm_gem_object_release(gem_object);
167out:
168 kfree(obj);
169 return ERR_PTR(err);
170}
171
172static int vgem_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
173 struct drm_mode_create_dumb *args)
174{
175 struct drm_gem_object *gem_object;
176 uint64_t size;
177 uint64_t pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
178
179 size = args->height * pitch;
180 if (size == 0)
181 return -EINVAL;
182
183 gem_object = vgem_gem_create(dev, file, &args->handle, size);
184
185 if (IS_ERR(gem_object)) {
186 DRM_DEBUG_DRIVER("object creation failed\n");
187 return PTR_ERR(gem_object);
188 }
189
190 args->size = gem_object->size;
191 args->pitch = pitch;
192
193 DRM_DEBUG_DRIVER("Created object of size %lld\n", size);
194
195 return 0;
196}
197
198int vgem_gem_dumb_map(struct drm_file *file, struct drm_device *dev,
199 uint32_t handle, uint64_t *offset)
200{
201 int ret = 0;
202 struct drm_gem_object *obj;
203
204 mutex_lock(&dev->struct_mutex);
205 obj = drm_gem_object_lookup(dev, file, handle);
206 if (!obj) {
207 ret = -ENOENT;
208 goto unlock;
209 }
210
211 if (!drm_vma_node_has_offset(&obj->vma_node)) {
212 ret = drm_gem_create_mmap_offset(obj);
213 if (ret)
214 goto unref;
215 }
216
217 BUG_ON(!obj->filp);
218
219 obj->filp->private_data = obj;
220
221 ret = vgem_gem_get_pages(to_vgem_bo(obj));
222 if (ret)
223 goto fail_get_pages;
224
225 *offset = drm_vma_node_offset_addr(&obj->vma_node);
226
227 goto unref;
228
229fail_get_pages:
230 drm_gem_free_mmap_offset(obj);
231unref:
232 drm_gem_object_unreference(obj);
233unlock:
234 mutex_unlock(&dev->struct_mutex);
235 return ret;
236}
237
238static struct drm_ioctl_desc vgem_ioctls[] = {
239};
240
241static const struct file_operations vgem_driver_fops = {
242 .owner = THIS_MODULE,
243 .open = drm_open,
244 .mmap = drm_gem_mmap,
245 .poll = drm_poll,
246 .read = drm_read,
247 .unlocked_ioctl = drm_ioctl,
248 .release = drm_release,
249};
250
251static struct drm_driver vgem_driver = {
252 .driver_features = DRIVER_GEM,
253 .gem_free_object = vgem_gem_free_object,
254 .gem_vm_ops = &vgem_gem_vm_ops,
255 .ioctls = vgem_ioctls,
256 .fops = &vgem_driver_fops,
257 .dumb_create = vgem_gem_dumb_create,
258 .dumb_map_offset = vgem_gem_dumb_map,
259 .name = DRIVER_NAME,
260 .desc = DRIVER_DESC,
261 .date = DRIVER_DATE,
262 .major = DRIVER_MAJOR,
263 .minor = DRIVER_MINOR,
264};
265
266struct drm_device *vgem_device;
267
268static int __init vgem_init(void)
269{
270 int ret;
271
272 vgem_device = drm_dev_alloc(&vgem_driver, NULL);
273 if (!vgem_device) {
274 ret = -ENOMEM;
275 goto out;
276 }
277
278 drm_dev_set_unique(vgem_device, "vgem");
279
280 ret = drm_dev_register(vgem_device, 0);
281
282 if (ret)
283 goto out_unref;
284
285 return 0;
286
287out_unref:
288 drm_dev_unref(vgem_device);
289out:
290 return ret;
291}
292
293static void __exit vgem_exit(void)
294{
295 drm_dev_unregister(vgem_device);
296 drm_dev_unref(vgem_device);
297}
298
299module_init(vgem_init);
300module_exit(vgem_exit);
301
302MODULE_AUTHOR("Red Hat, Inc.");
303MODULE_DESCRIPTION(DRIVER_DESC);
304MODULE_LICENSE("GPL and additional rights");
1/*
2 * Copyright 2011 Red Hat, Inc.
3 * Copyright © 2014 The Chromium OS Authors
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software")
7 * to deal in the software without restriction, including without limitation
8 * on the rights to use, copy, modify, merge, publish, distribute, sub
9 * license, and/or sell copies of the Software, and to permit persons to whom
10 * them Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTIBILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER
20 * IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Adam Jackson <ajax@redhat.com>
25 * Ben Widawsky <ben@bwidawsk.net>
26 */
27
28/**
29 * This is vgem, a (non-hardware-backed) GEM service. This is used by Mesa's
30 * software renderer and the X server for efficient buffer sharing.
31 */
32
33#include <linux/dma-buf.h>
34#include <linux/module.h>
35#include <linux/platform_device.h>
36#include <linux/shmem_fs.h>
37#include <linux/vmalloc.h>
38
39#include <drm/drm_drv.h>
40#include <drm/drm_file.h>
41#include <drm/drm_ioctl.h>
42#include <drm/drm_managed.h>
43#include <drm/drm_prime.h>
44
45#include "vgem_drv.h"
46
47#define DRIVER_NAME "vgem"
48#define DRIVER_DESC "Virtual GEM provider"
49#define DRIVER_DATE "20120112"
50#define DRIVER_MAJOR 1
51#define DRIVER_MINOR 0
52
53static struct vgem_device {
54 struct drm_device drm;
55 struct platform_device *platform;
56} *vgem_device;
57
58static void vgem_gem_free_object(struct drm_gem_object *obj)
59{
60 struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);
61
62 kvfree(vgem_obj->pages);
63 mutex_destroy(&vgem_obj->pages_lock);
64
65 if (obj->import_attach)
66 drm_prime_gem_destroy(obj, vgem_obj->table);
67
68 drm_gem_object_release(obj);
69 kfree(vgem_obj);
70}
71
72static vm_fault_t vgem_gem_fault(struct vm_fault *vmf)
73{
74 struct vm_area_struct *vma = vmf->vma;
75 struct drm_vgem_gem_object *obj = vma->vm_private_data;
76 /* We don't use vmf->pgoff since that has the fake offset */
77 unsigned long vaddr = vmf->address;
78 vm_fault_t ret = VM_FAULT_SIGBUS;
79 loff_t num_pages;
80 pgoff_t page_offset;
81 page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;
82
83 num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE);
84
85 if (page_offset >= num_pages)
86 return VM_FAULT_SIGBUS;
87
88 mutex_lock(&obj->pages_lock);
89 if (obj->pages) {
90 get_page(obj->pages[page_offset]);
91 vmf->page = obj->pages[page_offset];
92 ret = 0;
93 }
94 mutex_unlock(&obj->pages_lock);
95 if (ret) {
96 struct page *page;
97
98 page = shmem_read_mapping_page(
99 file_inode(obj->base.filp)->i_mapping,
100 page_offset);
101 if (!IS_ERR(page)) {
102 vmf->page = page;
103 ret = 0;
104 } else switch (PTR_ERR(page)) {
105 case -ENOSPC:
106 case -ENOMEM:
107 ret = VM_FAULT_OOM;
108 break;
109 case -EBUSY:
110 ret = VM_FAULT_RETRY;
111 break;
112 case -EFAULT:
113 case -EINVAL:
114 ret = VM_FAULT_SIGBUS;
115 break;
116 default:
117 WARN_ON(PTR_ERR(page));
118 ret = VM_FAULT_SIGBUS;
119 break;
120 }
121
122 }
123 return ret;
124}
125
126static const struct vm_operations_struct vgem_gem_vm_ops = {
127 .fault = vgem_gem_fault,
128 .open = drm_gem_vm_open,
129 .close = drm_gem_vm_close,
130};
131
132static int vgem_open(struct drm_device *dev, struct drm_file *file)
133{
134 struct vgem_file *vfile;
135 int ret;
136
137 vfile = kzalloc(sizeof(*vfile), GFP_KERNEL);
138 if (!vfile)
139 return -ENOMEM;
140
141 file->driver_priv = vfile;
142
143 ret = vgem_fence_open(vfile);
144 if (ret) {
145 kfree(vfile);
146 return ret;
147 }
148
149 return 0;
150}
151
152static void vgem_postclose(struct drm_device *dev, struct drm_file *file)
153{
154 struct vgem_file *vfile = file->driver_priv;
155
156 vgem_fence_close(vfile);
157 kfree(vfile);
158}
159
160static struct drm_vgem_gem_object *__vgem_gem_create(struct drm_device *dev,
161 unsigned long size)
162{
163 struct drm_vgem_gem_object *obj;
164 int ret;
165
166 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
167 if (!obj)
168 return ERR_PTR(-ENOMEM);
169
170 ret = drm_gem_object_init(dev, &obj->base, roundup(size, PAGE_SIZE));
171 if (ret) {
172 kfree(obj);
173 return ERR_PTR(ret);
174 }
175
176 mutex_init(&obj->pages_lock);
177
178 return obj;
179}
180
181static void __vgem_gem_destroy(struct drm_vgem_gem_object *obj)
182{
183 drm_gem_object_release(&obj->base);
184 kfree(obj);
185}
186
187static struct drm_gem_object *vgem_gem_create(struct drm_device *dev,
188 struct drm_file *file,
189 unsigned int *handle,
190 unsigned long size)
191{
192 struct drm_vgem_gem_object *obj;
193 int ret;
194
195 obj = __vgem_gem_create(dev, size);
196 if (IS_ERR(obj))
197 return ERR_CAST(obj);
198
199 ret = drm_gem_handle_create(file, &obj->base, handle);
200 if (ret) {
201 drm_gem_object_put(&obj->base);
202 return ERR_PTR(ret);
203 }
204
205 return &obj->base;
206}
207
208static int vgem_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
209 struct drm_mode_create_dumb *args)
210{
211 struct drm_gem_object *gem_object;
212 u64 pitch, size;
213
214 pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
215 size = args->height * pitch;
216 if (size == 0)
217 return -EINVAL;
218
219 gem_object = vgem_gem_create(dev, file, &args->handle, size);
220 if (IS_ERR(gem_object))
221 return PTR_ERR(gem_object);
222
223 args->size = gem_object->size;
224 args->pitch = pitch;
225
226 drm_gem_object_put(gem_object);
227
228 DRM_DEBUG("Created object of size %llu\n", args->size);
229
230 return 0;
231}
232
233static struct drm_ioctl_desc vgem_ioctls[] = {
234 DRM_IOCTL_DEF_DRV(VGEM_FENCE_ATTACH, vgem_fence_attach_ioctl, DRM_RENDER_ALLOW),
235 DRM_IOCTL_DEF_DRV(VGEM_FENCE_SIGNAL, vgem_fence_signal_ioctl, DRM_RENDER_ALLOW),
236};
237
238static int vgem_mmap(struct file *filp, struct vm_area_struct *vma)
239{
240 unsigned long flags = vma->vm_flags;
241 int ret;
242
243 ret = drm_gem_mmap(filp, vma);
244 if (ret)
245 return ret;
246
247 /* Keep the WC mmaping set by drm_gem_mmap() but our pages
248 * are ordinary and not special.
249 */
250 vma->vm_flags = flags | VM_DONTEXPAND | VM_DONTDUMP;
251 return 0;
252}
253
254static const struct file_operations vgem_driver_fops = {
255 .owner = THIS_MODULE,
256 .open = drm_open,
257 .mmap = vgem_mmap,
258 .poll = drm_poll,
259 .read = drm_read,
260 .unlocked_ioctl = drm_ioctl,
261 .compat_ioctl = drm_compat_ioctl,
262 .release = drm_release,
263};
264
265static struct page **vgem_pin_pages(struct drm_vgem_gem_object *bo)
266{
267 mutex_lock(&bo->pages_lock);
268 if (bo->pages_pin_count++ == 0) {
269 struct page **pages;
270
271 pages = drm_gem_get_pages(&bo->base);
272 if (IS_ERR(pages)) {
273 bo->pages_pin_count--;
274 mutex_unlock(&bo->pages_lock);
275 return pages;
276 }
277
278 bo->pages = pages;
279 }
280 mutex_unlock(&bo->pages_lock);
281
282 return bo->pages;
283}
284
285static void vgem_unpin_pages(struct drm_vgem_gem_object *bo)
286{
287 mutex_lock(&bo->pages_lock);
288 if (--bo->pages_pin_count == 0) {
289 drm_gem_put_pages(&bo->base, bo->pages, true, true);
290 bo->pages = NULL;
291 }
292 mutex_unlock(&bo->pages_lock);
293}
294
295static int vgem_prime_pin(struct drm_gem_object *obj)
296{
297 struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
298 long n_pages = obj->size >> PAGE_SHIFT;
299 struct page **pages;
300
301 pages = vgem_pin_pages(bo);
302 if (IS_ERR(pages))
303 return PTR_ERR(pages);
304
305 /* Flush the object from the CPU cache so that importers can rely
306 * on coherent indirect access via the exported dma-address.
307 */
308 drm_clflush_pages(pages, n_pages);
309
310 return 0;
311}
312
313static void vgem_prime_unpin(struct drm_gem_object *obj)
314{
315 struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
316
317 vgem_unpin_pages(bo);
318}
319
320static struct sg_table *vgem_prime_get_sg_table(struct drm_gem_object *obj)
321{
322 struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
323
324 return drm_prime_pages_to_sg(bo->pages, bo->base.size >> PAGE_SHIFT);
325}
326
327static struct drm_gem_object* vgem_prime_import(struct drm_device *dev,
328 struct dma_buf *dma_buf)
329{
330 struct vgem_device *vgem = container_of(dev, typeof(*vgem), drm);
331
332 return drm_gem_prime_import_dev(dev, dma_buf, &vgem->platform->dev);
333}
334
335static struct drm_gem_object *vgem_prime_import_sg_table(struct drm_device *dev,
336 struct dma_buf_attachment *attach, struct sg_table *sg)
337{
338 struct drm_vgem_gem_object *obj;
339 int npages;
340
341 obj = __vgem_gem_create(dev, attach->dmabuf->size);
342 if (IS_ERR(obj))
343 return ERR_CAST(obj);
344
345 npages = PAGE_ALIGN(attach->dmabuf->size) / PAGE_SIZE;
346
347 obj->table = sg;
348 obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
349 if (!obj->pages) {
350 __vgem_gem_destroy(obj);
351 return ERR_PTR(-ENOMEM);
352 }
353
354 obj->pages_pin_count++; /* perma-pinned */
355 drm_prime_sg_to_page_addr_arrays(obj->table, obj->pages, NULL,
356 npages);
357 return &obj->base;
358}
359
360static void *vgem_prime_vmap(struct drm_gem_object *obj)
361{
362 struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
363 long n_pages = obj->size >> PAGE_SHIFT;
364 struct page **pages;
365
366 pages = vgem_pin_pages(bo);
367 if (IS_ERR(pages))
368 return NULL;
369
370 return vmap(pages, n_pages, 0, pgprot_writecombine(PAGE_KERNEL));
371}
372
373static void vgem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
374{
375 struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
376
377 vunmap(vaddr);
378 vgem_unpin_pages(bo);
379}
380
381static int vgem_prime_mmap(struct drm_gem_object *obj,
382 struct vm_area_struct *vma)
383{
384 int ret;
385
386 if (obj->size < vma->vm_end - vma->vm_start)
387 return -EINVAL;
388
389 if (!obj->filp)
390 return -ENODEV;
391
392 ret = call_mmap(obj->filp, vma);
393 if (ret)
394 return ret;
395
396 fput(vma->vm_file);
397 vma->vm_file = get_file(obj->filp);
398 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
399 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
400
401 return 0;
402}
403
404static void vgem_release(struct drm_device *dev)
405{
406 struct vgem_device *vgem = container_of(dev, typeof(*vgem), drm);
407
408 platform_device_unregister(vgem->platform);
409}
410
411static struct drm_driver vgem_driver = {
412 .driver_features = DRIVER_GEM | DRIVER_RENDER,
413 .release = vgem_release,
414 .open = vgem_open,
415 .postclose = vgem_postclose,
416 .gem_free_object_unlocked = vgem_gem_free_object,
417 .gem_vm_ops = &vgem_gem_vm_ops,
418 .ioctls = vgem_ioctls,
419 .num_ioctls = ARRAY_SIZE(vgem_ioctls),
420 .fops = &vgem_driver_fops,
421
422 .dumb_create = vgem_gem_dumb_create,
423
424 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
425 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
426 .gem_prime_pin = vgem_prime_pin,
427 .gem_prime_unpin = vgem_prime_unpin,
428 .gem_prime_import = vgem_prime_import,
429 .gem_prime_import_sg_table = vgem_prime_import_sg_table,
430 .gem_prime_get_sg_table = vgem_prime_get_sg_table,
431 .gem_prime_vmap = vgem_prime_vmap,
432 .gem_prime_vunmap = vgem_prime_vunmap,
433 .gem_prime_mmap = vgem_prime_mmap,
434
435 .name = DRIVER_NAME,
436 .desc = DRIVER_DESC,
437 .date = DRIVER_DATE,
438 .major = DRIVER_MAJOR,
439 .minor = DRIVER_MINOR,
440};
441
442static int __init vgem_init(void)
443{
444 int ret;
445
446 vgem_device = kzalloc(sizeof(*vgem_device), GFP_KERNEL);
447 if (!vgem_device)
448 return -ENOMEM;
449
450 vgem_device->platform =
451 platform_device_register_simple("vgem", -1, NULL, 0);
452 if (IS_ERR(vgem_device->platform)) {
453 ret = PTR_ERR(vgem_device->platform);
454 goto out_free;
455 }
456
457 dma_coerce_mask_and_coherent(&vgem_device->platform->dev,
458 DMA_BIT_MASK(64));
459 ret = drm_dev_init(&vgem_device->drm, &vgem_driver,
460 &vgem_device->platform->dev);
461 if (ret)
462 goto out_unregister;
463 drmm_add_final_kfree(&vgem_device->drm, vgem_device);
464
465 /* Final step: expose the device/driver to userspace */
466 ret = drm_dev_register(&vgem_device->drm, 0);
467 if (ret)
468 goto out_put;
469
470 return 0;
471
472out_put:
473 drm_dev_put(&vgem_device->drm);
474 return ret;
475
476out_unregister:
477 platform_device_unregister(vgem_device->platform);
478out_free:
479 kfree(vgem_device);
480 return ret;
481}
482
483static void __exit vgem_exit(void)
484{
485 drm_dev_unregister(&vgem_device->drm);
486 drm_dev_put(&vgem_device->drm);
487}
488
489module_init(vgem_init);
490module_exit(vgem_exit);
491
492MODULE_AUTHOR("Red Hat, Inc.");
493MODULE_AUTHOR("Intel Corporation");
494MODULE_DESCRIPTION(DRIVER_DESC);
495MODULE_LICENSE("GPL and additional rights");