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