aboutsummaryrefslogtreecommitdiff
path: root/linux/drm_vm.h
blob: 123eea2992eca98c2629920ab62cf01d5b70a0ea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
/* drm_vm.h -- Memory mapping for DRM -*- linux-c -*-
 * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
 *
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Rickard E. (Rik) Faith <faith@valinux.com>
 *    Gareth Hughes <gareth@valinux.com>
 */

#define __NO_VERSION__
#include "drmP.h"

struct vm_operations_struct   drm_vm_ops = {
	nopage:	 DRM(vm_nopage),
	open:	 DRM(vm_open),
	close:	 DRM(vm_close),
};

struct vm_operations_struct   drm_vm_shm_ops = {
	nopage:	 DRM(vm_shm_nopage),
	open:	 DRM(vm_open),
	close:	 DRM(vm_shm_close),
};

struct vm_operations_struct   drm_vm_dma_ops = {
	nopage:	 DRM(vm_dma_nopage),
	open:	 DRM(vm_open),
	close:	 DRM(vm_close),
};

#if LINUX_VERSION_CODE < 0x020317
unsigned long DRM(vm_nopage)(struct vm_area_struct *vma,
			     unsigned long address,
			     int write_access)
#else
				/* Return type changed in 2.3.23 */
struct page *DRM(vm_nopage)(struct vm_area_struct *vma,
			    unsigned long address,
			    int write_access)
#endif
{
	return NOPAGE_SIGBUS;		/* Disallow mremap */
}

#if LINUX_VERSION_CODE < 0x020317
unsigned long DRM(vm_shm_nopage)(struct vm_area_struct *vma,
				 unsigned long address,
				 int write_access)
#else
				/* Return type changed in 2.3.23 */
struct page *DRM(vm_shm_nopage)(struct vm_area_struct *vma,
				unsigned long address,
				int write_access)
#endif
{
#if LINUX_VERSION_CODE >= 0x020300
	drm_map_t	 *map	 = (drm_map_t *)vma->vm_private_data;
#else
	drm_map_t	 *map	 = (drm_map_t *)vma->vm_pte;
#endif
	unsigned long	 physical;
	unsigned long	 offset;
	unsigned long	 i;
	pgd_t		 *pgd;
	pmd_t		 *pmd;
	pte_t		 *pte;

	if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
	if (!map)    		   return NOPAGE_OOM;  /* Nothing allocated */

	offset	 = address - vma->vm_start;
	i = (unsigned long)map->handle + offset;
	/* We have to walk page tables here because we need large SAREA's, and
	 * they need to be virtually contigious in kernel space.
	 */
	pgd = pgd_offset_k( i );
	if( !pgd_present( *pgd ) ) return NOPAGE_OOM;
	pmd = pmd_offset( pgd, i );
	if( !pmd_present( *pmd ) ) return NOPAGE_OOM;
	pte = pte_offset( pmd, i );
	if( !pte_present( *pte ) ) return NOPAGE_OOM;
	physical = (unsigned long)pte_page( *pte )->virtual;
	atomic_inc(&virt_to_page(physical)->count); /* Dec. by kernel */

	DRM_DEBUG("0x%08lx => 0x%08lx\n", address, physical);
#if LINUX_VERSION_CODE < 0x020317
	return physical;
#else
	return virt_to_page(physical);
#endif
}

/* Special close routine which deletes map information if we are the last
 * person to close a mapping and its not in the global maplist.
 */

void DRM(vm_shm_close)(struct vm_area_struct *vma)
{
	drm_file_t	*priv	= vma->vm_file->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_vma_entry_t *pt, *prev;
	drm_map_t *map;
	drm_map_list_t *r_list;
	struct list_head *list;
	int found_maps = 0;

	DRM_DEBUG("0x%08lx,0x%08lx\n",
		  vma->vm_start, vma->vm_end - vma->vm_start);
#if LINUX_VERSION_CODE < 0x020333
	MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
#endif
	atomic_dec(&dev->vma_count);

#if LINUX_VERSION_CODE >= 0x020300
	map = vma->vm_private_data;
#else
	map = vma->vm_pte;
#endif

	down(&dev->struct_sem);
	for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
#if LINUX_VERSION_CODE >= 0x020300
		if (pt->vma->vm_private_data == map) found_maps++;
#else
		if (pt->vma->vm_pte == map) found_maps++;
#endif
		if (pt->vma == vma) {
			if (prev) {
				prev->next = pt->next;
			} else {
				dev->vmalist = pt->next;
			}
			DRM(free)(pt, sizeof(*pt), DRM_MEM_VMAS);
		}
	}
	/* We were the only map that was found */
	if(found_maps == 1 && 
	   map->flags & _DRM_REMOVABLE) {
		/* Check to see if we are in the maplist, if we are not, then
		 * we delete this mappings information.
		 */
		found_maps = 0;
		list = &dev->maplist->head;
		list_for_each(list, &dev->maplist->head) {
			r_list = (drm_map_list_t *) list;
			if (r_list->map == map) found_maps++;
		}

		if(!found_maps) {
			switch (map->type) {
			case _DRM_REGISTERS:
			case _DRM_FRAME_BUFFER:
#ifdef __REALLY_HAVE_MTRR
				if (map->mtrr >= 0) {
					int retcode;
					retcode = mtrr_del(map->mtrr,
							   map->offset,
							   map->size);
					DRM_DEBUG("mtrr_del = %d\n", retcode);
				}
#endif
				DRM(ioremapfree)(map->handle, map->size);
				break;
			case _DRM_SHM:
				vfree(map->handle);
				break;
			case _DRM_AGP:
				break;
			}
			DRM(free)(map, sizeof(*map), DRM_MEM_MAPS);
		}
	}
	up(&dev->struct_sem);
}

#if LINUX_VERSION_CODE < 0x020317
unsigned long DRM(vm_dma_nopage)(struct vm_area_struct *vma,
				 unsigned long address,
				 int write_access)
#else
				/* Return type changed in 2.3.23 */
struct page *DRM(vm_dma_nopage)(struct vm_area_struct *vma,
				unsigned long address,
				int write_access)
#endif
{
	drm_file_t	 *priv	 = vma->vm_file->private_data;
	drm_device_t	 *dev	 = priv->dev;
	drm_device_dma_t *dma	 = dev->dma;
	unsigned long	 physical;
	unsigned long	 offset;
	unsigned long	 page;

	if (!dma)		   return NOPAGE_SIGBUS; /* Error */
	if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
	if (!dma->pagelist)	   return NOPAGE_OOM ; /* Nothing allocated */

	offset	 = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
	page	 = offset >> PAGE_SHIFT;
	physical = dma->pagelist[page] + (offset & (~PAGE_MASK));
	atomic_inc(&virt_to_page(physical)->count); /* Dec. by kernel */

	DRM_DEBUG("0x%08lx (page %lu) => 0x%08lx\n", address, page, physical);
#if LINUX_VERSION_CODE < 0x020317
	return physical;
#else
	return virt_to_page(physical);
#endif
}

void DRM(vm_open)(struct vm_area_struct *vma)
{
	drm_file_t	*priv	= vma->vm_file->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_vma_entry_t *vma_entry;

	DRM_DEBUG("0x%08lx,0x%08lx\n",
		  vma->vm_start, vma->vm_end - vma->vm_start);
	atomic_inc(&dev->vma_count);
#if LINUX_VERSION_CODE < 0x020333
				/* The map can exist after the fd is closed. */
	MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */
#endif

	vma_entry = DRM(alloc)(sizeof(*vma_entry), DRM_MEM_VMAS);
	if (vma_entry) {
		down(&dev->struct_sem);
		vma_entry->vma	= vma;
		vma_entry->next = dev->vmalist;
		vma_entry->pid	= current->pid;
		dev->vmalist	= vma_entry;
		up(&dev->struct_sem);
	}
}

void DRM(vm_close)(struct vm_area_struct *vma)
{
	drm_file_t	*priv	= vma->vm_file->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_vma_entry_t *pt, *prev;

	DRM_DEBUG("0x%08lx,0x%08lx\n",
		  vma->vm_start, vma->vm_end - vma->vm_start);
#if LINUX_VERSION_CODE < 0x020333
	MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
#endif
	atomic_dec(&dev->vma_count);

	down(&dev->struct_sem);
	for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
		if (pt->vma == vma) {
			if (prev) {
				prev->next = pt->next;
			} else {
				dev->vmalist = pt->next;
			}
			DRM(free)(pt, sizeof(*pt), DRM_MEM_VMAS);
			break;
		}
	}
	up(&dev->struct_sem);
}

int DRM(mmap_dma)(struct file *filp, struct vm_area_struct *vma)
{
	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev;
	drm_device_dma_t *dma;
	unsigned long	 length	 = vma->vm_end - vma->vm_start;

	lock_kernel();
	dev	 = priv->dev;
	dma	 = dev->dma;
	DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
		  vma->vm_start, vma->vm_end, VM_OFFSET(vma));

				/* Length must match exact page count */
	if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
		unlock_kernel();
		return -EINVAL;
	}
	unlock_kernel();

	vma->vm_ops   = &drm_vm_dma_ops;
	vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */

#if LINUX_VERSION_CODE < 0x020203 /* KERNEL_VERSION(2,2,3) */
				/* In Linux 2.2.3 and above, this is
				   handled in do_mmap() in mm/mmap.c. */
	++filp->f_count;
#endif
	vma->vm_file  =	 filp;	/* Needed for drm_vm_open() */
	DRM(vm_open)(vma);
	return 0;
}

int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
{
	drm_file_t	*priv	= filp->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_map_t	*map	= NULL;
	drm_map_list_t  *r_list;
	struct list_head *list;

	DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
		  vma->vm_start, vma->vm_end, VM_OFFSET(vma));

	if (!VM_OFFSET(vma)) return DRM(mmap_dma)(filp, vma);

				/* A sequential search of a linked list is
				   fine here because: 1) there will only be
				   about 5-10 entries in the list and, 2) a
				   DRI client only has to do this mapping
				   once, so it doesn't have to be optimized
				   for performance, even if the list was a
				   bit longer. */
	list_for_each(list, &dev->maplist->head) {
		r_list = (drm_map_list_t *)list;
		map = r_list->map;
		if (!map) continue;
		if (map->offset == VM_OFFSET(vma)) break;
	}

	if (!map || ((map->flags&_DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
		return -EPERM;

				/* Check for valid size. */
	if (map->size != vma->vm_end - vma->vm_start) return -EINVAL;

	if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
		vma->vm_flags &= VM_MAYWRITE;
#if defined(__i386__)
		pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
#else
				/* Ye gads this is ugly.  With more thought
                                   we could move this up higher and use
                                   `protection_map' instead.  */
		vma->vm_page_prot = __pgprot(pte_val(pte_wrprotect(
			__pte(pgprot_val(vma->vm_page_prot)))));
#endif
	}

	switch (map->type) {
	case _DRM_FRAME_BUFFER:
	case _DRM_REGISTERS:
	case _DRM_AGP:
		if (VM_OFFSET(vma) >= __pa(high_memory)) {
#if defined(__i386__)
			if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {
				pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
				pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
			}
#elif defined(__ia64__)
			if (map->type != _DRM_AGP)
				vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
#endif
			vma->vm_flags |= VM_IO;	/* not in core dump */
		}
		if (remap_page_range(vma->vm_start,
				     VM_OFFSET(vma),
				     vma->vm_end - vma->vm_start,
				     vma->vm_page_prot))
				return -EAGAIN;
		DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
			  " offset = 0x%lx\n",
			  map->type,
			  vma->vm_start, vma->vm_end, VM_OFFSET(vma));
		vma->vm_ops = &drm_vm_ops;
		break;
	case _DRM_SHM:
		vma->vm_ops = &drm_vm_shm_ops;
#if LINUX_VERSION_CODE >= 0x020300
		vma->vm_private_data = (void *)map;
#else
		vma->vm_pte = (unsigned long)map;
#endif
				/* Don't let this area swap.  Change when
				   DRM_KERNEL advisory is supported. */
		vma->vm_flags |= VM_LOCKED;
		break;
	default:
		return -EINVAL;	/* This should never happen. */
	}
	vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */

#if LINUX_VERSION_CODE < 0x020203 /* KERNEL_VERSION(2,2,3) */
				/* In Linux 2.2.3 and above, this is
				   handled in do_mmap() in mm/mmap.c. */
	++filp->f_count;
#endif
	vma->vm_file  =	 filp;	/* Needed for drm_vm_open() */
	DRM(vm_open)(vma);
	return 0;
}