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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_prime.h>
43
44#include "vgem_drv.h"
45
46#define DRIVER_NAME "vgem"
47#define DRIVER_DESC "Virtual GEM provider"
48#define DRIVER_DATE "20120112"
49#define DRIVER_MAJOR 1
50#define DRIVER_MINOR 0
51
52static struct vgem_device {
53 struct drm_device drm;
54 struct platform_device *platform;
55} *vgem_device;
56
57static void vgem_gem_free_object(struct drm_gem_object *obj)
58{
59 struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);
60
61 kvfree(vgem_obj->pages);
62 mutex_destroy(&vgem_obj->pages_lock);
63
64 if (obj->import_attach)
65 drm_prime_gem_destroy(obj, vgem_obj->table);
66
67 drm_gem_object_release(obj);
68 kfree(vgem_obj);
69}
70
71static vm_fault_t vgem_gem_fault(struct vm_fault *vmf)
72{
73 struct vm_area_struct *vma = vmf->vma;
74 struct drm_vgem_gem_object *obj = vma->vm_private_data;
75 /* We don't use vmf->pgoff since that has the fake offset */
76 unsigned long vaddr = vmf->address;
77 vm_fault_t ret = VM_FAULT_SIGBUS;
78 loff_t num_pages;
79 pgoff_t page_offset;
80 page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;
81
82 num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE);
83
84 if (page_offset >= num_pages)
85 return VM_FAULT_SIGBUS;
86
87 mutex_lock(&obj->pages_lock);
88 if (obj->pages) {
89 get_page(obj->pages[page_offset]);
90 vmf->page = obj->pages[page_offset];
91 ret = 0;
92 }
93 mutex_unlock(&obj->pages_lock);
94 if (ret) {
95 struct page *page;
96
97 page = shmem_read_mapping_page(
98 file_inode(obj->base.filp)->i_mapping,
99 page_offset);
100 if (!IS_ERR(page)) {
101 vmf->page = page;
102 ret = 0;
103 } else switch (PTR_ERR(page)) {
104 case -ENOSPC:
105 case -ENOMEM:
106 ret = VM_FAULT_OOM;
107 break;
108 case -EBUSY:
109 ret = VM_FAULT_RETRY;
110 break;
111 case -EFAULT:
112 case -EINVAL:
113 ret = VM_FAULT_SIGBUS;
114 break;
115 default:
116 WARN_ON(PTR_ERR(page));
117 ret = VM_FAULT_SIGBUS;
118 break;
119 }
120
121 }
122 return ret;
123}
124
125static const struct vm_operations_struct vgem_gem_vm_ops = {
126 .fault = vgem_gem_fault,
127 .open = drm_gem_vm_open,
128 .close = drm_gem_vm_close,
129};
130
131static int vgem_open(struct drm_device *dev, struct drm_file *file)
132{
133 struct vgem_file *vfile;
134 int ret;
135
136 vfile = kzalloc(sizeof(*vfile), GFP_KERNEL);
137 if (!vfile)
138 return -ENOMEM;
139
140 file->driver_priv = vfile;
141
142 ret = vgem_fence_open(vfile);
143 if (ret) {
144 kfree(vfile);
145 return ret;
146 }
147
148 return 0;
149}
150
151static void vgem_postclose(struct drm_device *dev, struct drm_file *file)
152{
153 struct vgem_file *vfile = file->driver_priv;
154
155 vgem_fence_close(vfile);
156 kfree(vfile);
157}
158
159static struct drm_vgem_gem_object *__vgem_gem_create(struct drm_device *dev,
160 unsigned long size)
161{
162 struct drm_vgem_gem_object *obj;
163 int ret;
164
165 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
166 if (!obj)
167 return ERR_PTR(-ENOMEM);
168
169 ret = drm_gem_object_init(dev, &obj->base, roundup(size, PAGE_SIZE));
170 if (ret) {
171 kfree(obj);
172 return ERR_PTR(ret);
173 }
174
175 mutex_init(&obj->pages_lock);
176
177 return obj;
178}
179
180static void __vgem_gem_destroy(struct drm_vgem_gem_object *obj)
181{
182 drm_gem_object_release(&obj->base);
183 kfree(obj);
184}
185
186static struct drm_gem_object *vgem_gem_create(struct drm_device *dev,
187 struct drm_file *file,
188 unsigned int *handle,
189 unsigned long size)
190{
191 struct drm_vgem_gem_object *obj;
192 int ret;
193
194 obj = __vgem_gem_create(dev, size);
195 if (IS_ERR(obj))
196 return ERR_CAST(obj);
197
198 ret = drm_gem_handle_create(file, &obj->base, handle);
199 drm_gem_object_put_unlocked(&obj->base);
200 if (ret)
201 return ERR_PTR(ret);
202
203 return &obj->base;
204}
205
206static int vgem_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
207 struct drm_mode_create_dumb *args)
208{
209 struct drm_gem_object *gem_object;
210 u64 pitch, size;
211
212 pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
213 size = args->height * pitch;
214 if (size == 0)
215 return -EINVAL;
216
217 gem_object = vgem_gem_create(dev, file, &args->handle, size);
218 if (IS_ERR(gem_object))
219 return PTR_ERR(gem_object);
220
221 args->size = gem_object->size;
222 args->pitch = pitch;
223
224 DRM_DEBUG("Created object of size %lld\n", size);
225
226 return 0;
227}
228
229static int vgem_gem_dumb_map(struct drm_file *file, struct drm_device *dev,
230 uint32_t handle, uint64_t *offset)
231{
232 struct drm_gem_object *obj;
233 int ret;
234
235 obj = drm_gem_object_lookup(file, handle);
236 if (!obj)
237 return -ENOENT;
238
239 if (!obj->filp) {
240 ret = -EINVAL;
241 goto unref;
242 }
243
244 ret = drm_gem_create_mmap_offset(obj);
245 if (ret)
246 goto unref;
247
248 *offset = drm_vma_node_offset_addr(&obj->vma_node);
249unref:
250 drm_gem_object_put_unlocked(obj);
251
252 return ret;
253}
254
255static struct drm_ioctl_desc vgem_ioctls[] = {
256 DRM_IOCTL_DEF_DRV(VGEM_FENCE_ATTACH, vgem_fence_attach_ioctl, DRM_RENDER_ALLOW),
257 DRM_IOCTL_DEF_DRV(VGEM_FENCE_SIGNAL, vgem_fence_signal_ioctl, DRM_RENDER_ALLOW),
258};
259
260static int vgem_mmap(struct file *filp, struct vm_area_struct *vma)
261{
262 unsigned long flags = vma->vm_flags;
263 int ret;
264
265 ret = drm_gem_mmap(filp, vma);
266 if (ret)
267 return ret;
268
269 /* Keep the WC mmaping set by drm_gem_mmap() but our pages
270 * are ordinary and not special.
271 */
272 vma->vm_flags = flags | VM_DONTEXPAND | VM_DONTDUMP;
273 return 0;
274}
275
276static const struct file_operations vgem_driver_fops = {
277 .owner = THIS_MODULE,
278 .open = drm_open,
279 .mmap = vgem_mmap,
280 .poll = drm_poll,
281 .read = drm_read,
282 .unlocked_ioctl = drm_ioctl,
283 .compat_ioctl = drm_compat_ioctl,
284 .release = drm_release,
285};
286
287static struct page **vgem_pin_pages(struct drm_vgem_gem_object *bo)
288{
289 mutex_lock(&bo->pages_lock);
290 if (bo->pages_pin_count++ == 0) {
291 struct page **pages;
292
293 pages = drm_gem_get_pages(&bo->base);
294 if (IS_ERR(pages)) {
295 bo->pages_pin_count--;
296 mutex_unlock(&bo->pages_lock);
297 return pages;
298 }
299
300 bo->pages = pages;
301 }
302 mutex_unlock(&bo->pages_lock);
303
304 return bo->pages;
305}
306
307static void vgem_unpin_pages(struct drm_vgem_gem_object *bo)
308{
309 mutex_lock(&bo->pages_lock);
310 if (--bo->pages_pin_count == 0) {
311 drm_gem_put_pages(&bo->base, bo->pages, true, true);
312 bo->pages = NULL;
313 }
314 mutex_unlock(&bo->pages_lock);
315}
316
317static int vgem_prime_pin(struct drm_gem_object *obj)
318{
319 struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
320 long n_pages = obj->size >> PAGE_SHIFT;
321 struct page **pages;
322
323 pages = vgem_pin_pages(bo);
324 if (IS_ERR(pages))
325 return PTR_ERR(pages);
326
327 /* Flush the object from the CPU cache so that importers can rely
328 * on coherent indirect access via the exported dma-address.
329 */
330 drm_clflush_pages(pages, n_pages);
331
332 return 0;
333}
334
335static void vgem_prime_unpin(struct drm_gem_object *obj)
336{
337 struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
338
339 vgem_unpin_pages(bo);
340}
341
342static struct sg_table *vgem_prime_get_sg_table(struct drm_gem_object *obj)
343{
344 struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
345
346 return drm_prime_pages_to_sg(bo->pages, bo->base.size >> PAGE_SHIFT);
347}
348
349static struct drm_gem_object* vgem_prime_import(struct drm_device *dev,
350 struct dma_buf *dma_buf)
351{
352 struct vgem_device *vgem = container_of(dev, typeof(*vgem), drm);
353
354 return drm_gem_prime_import_dev(dev, dma_buf, &vgem->platform->dev);
355}
356
357static struct drm_gem_object *vgem_prime_import_sg_table(struct drm_device *dev,
358 struct dma_buf_attachment *attach, struct sg_table *sg)
359{
360 struct drm_vgem_gem_object *obj;
361 int npages;
362
363 obj = __vgem_gem_create(dev, attach->dmabuf->size);
364 if (IS_ERR(obj))
365 return ERR_CAST(obj);
366
367 npages = PAGE_ALIGN(attach->dmabuf->size) / PAGE_SIZE;
368
369 obj->table = sg;
370 obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
371 if (!obj->pages) {
372 __vgem_gem_destroy(obj);
373 return ERR_PTR(-ENOMEM);
374 }
375
376 obj->pages_pin_count++; /* perma-pinned */
377 drm_prime_sg_to_page_addr_arrays(obj->table, obj->pages, NULL,
378 npages);
379 return &obj->base;
380}
381
382static void *vgem_prime_vmap(struct drm_gem_object *obj)
383{
384 struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
385 long n_pages = obj->size >> PAGE_SHIFT;
386 struct page **pages;
387
388 pages = vgem_pin_pages(bo);
389 if (IS_ERR(pages))
390 return NULL;
391
392 return vmap(pages, n_pages, 0, pgprot_writecombine(PAGE_KERNEL));
393}
394
395static void vgem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
396{
397 struct drm_vgem_gem_object *bo = to_vgem_bo(obj);
398
399 vunmap(vaddr);
400 vgem_unpin_pages(bo);
401}
402
403static int vgem_prime_mmap(struct drm_gem_object *obj,
404 struct vm_area_struct *vma)
405{
406 int ret;
407
408 if (obj->size < vma->vm_end - vma->vm_start)
409 return -EINVAL;
410
411 if (!obj->filp)
412 return -ENODEV;
413
414 ret = call_mmap(obj->filp, vma);
415 if (ret)
416 return ret;
417
418 fput(vma->vm_file);
419 vma->vm_file = get_file(obj->filp);
420 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
421 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
422
423 return 0;
424}
425
426static void vgem_release(struct drm_device *dev)
427{
428 struct vgem_device *vgem = container_of(dev, typeof(*vgem), drm);
429
430 platform_device_unregister(vgem->platform);
431 drm_dev_fini(&vgem->drm);
432
433 kfree(vgem);
434}
435
436static struct drm_driver vgem_driver = {
437 .driver_features = DRIVER_GEM | DRIVER_RENDER,
438 .release = vgem_release,
439 .open = vgem_open,
440 .postclose = vgem_postclose,
441 .gem_free_object_unlocked = vgem_gem_free_object,
442 .gem_vm_ops = &vgem_gem_vm_ops,
443 .ioctls = vgem_ioctls,
444 .num_ioctls = ARRAY_SIZE(vgem_ioctls),
445 .fops = &vgem_driver_fops,
446
447 .dumb_create = vgem_gem_dumb_create,
448 .dumb_map_offset = vgem_gem_dumb_map,
449
450 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
451 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
452 .gem_prime_pin = vgem_prime_pin,
453 .gem_prime_unpin = vgem_prime_unpin,
454 .gem_prime_import = vgem_prime_import,
455 .gem_prime_import_sg_table = vgem_prime_import_sg_table,
456 .gem_prime_get_sg_table = vgem_prime_get_sg_table,
457 .gem_prime_vmap = vgem_prime_vmap,
458 .gem_prime_vunmap = vgem_prime_vunmap,
459 .gem_prime_mmap = vgem_prime_mmap,
460
461 .name = DRIVER_NAME,
462 .desc = DRIVER_DESC,
463 .date = DRIVER_DATE,
464 .major = DRIVER_MAJOR,
465 .minor = DRIVER_MINOR,
466};
467
468static int __init vgem_init(void)
469{
470 int ret;
471
472 vgem_device = kzalloc(sizeof(*vgem_device), GFP_KERNEL);
473 if (!vgem_device)
474 return -ENOMEM;
475
476 vgem_device->platform =
477 platform_device_register_simple("vgem", -1, NULL, 0);
478 if (IS_ERR(vgem_device->platform)) {
479 ret = PTR_ERR(vgem_device->platform);
480 goto out_free;
481 }
482
483 dma_coerce_mask_and_coherent(&vgem_device->platform->dev,
484 DMA_BIT_MASK(64));
485 ret = drm_dev_init(&vgem_device->drm, &vgem_driver,
486 &vgem_device->platform->dev);
487 if (ret)
488 goto out_unregister;
489
490 /* Final step: expose the device/driver to userspace */
491 ret = drm_dev_register(&vgem_device->drm, 0);
492 if (ret)
493 goto out_fini;
494
495 return 0;
496
497out_fini:
498 drm_dev_fini(&vgem_device->drm);
499out_unregister:
500 platform_device_unregister(vgem_device->platform);
501out_free:
502 kfree(vgem_device);
503 return ret;
504}
505
506static void __exit vgem_exit(void)
507{
508 drm_dev_unregister(&vgem_device->drm);
509 drm_dev_put(&vgem_device->drm);
510}
511
512module_init(vgem_init);
513module_exit(vgem_exit);
514
515MODULE_AUTHOR("Red Hat, Inc.");
516MODULE_AUTHOR("Intel Corporation");
517MODULE_DESCRIPTION(DRIVER_DESC);
518MODULE_LICENSE("GPL and additional rights");