Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_vm.c |
1da177e4 | 3 | * Memory mapping for DRM |
b5e89ed5 | 4 | * |
1da177e4 LT |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com | |
11 | * | |
12 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a | |
17 | * copy of this software and associated documentation files (the "Software"), | |
18 | * to deal in the Software without restriction, including without limitation | |
19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
20 | * and/or sell copies of the Software, and to permit persons to whom the | |
21 | * Software is furnished to do so, subject to the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice (including the next | |
24 | * paragraph) shall be included in all copies or substantial portions of the | |
25 | * Software. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
33 | * OTHER DEALINGS IN THE SOFTWARE. | |
34 | */ | |
35 | ||
36 | #include "drmP.h" | |
37 | #if defined(__ia64__) | |
38 | #include <linux/efi.h> | |
39 | #endif | |
40 | ||
c94f7029 DA |
41 | static void drm_vm_open(struct vm_area_struct *vma); |
42 | static void drm_vm_close(struct vm_area_struct *vma); | |
1da177e4 | 43 | |
5cc7f9ab DA |
44 | pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma) |
45 | { | |
46 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); | |
47 | ||
48 | #if defined(__i386__) || defined(__x86_64__) | |
49 | if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) { | |
50 | pgprot_val(tmp) |= _PAGE_PCD; | |
51 | pgprot_val(tmp) &= ~_PAGE_PWT; | |
52 | } | |
53 | #elif defined(__powerpc__) | |
54 | pgprot_val(tmp) |= _PAGE_NO_CACHE; | |
55 | if (map_type == _DRM_REGISTERS) | |
56 | pgprot_val(tmp) |= _PAGE_GUARDED; | |
57 | #endif | |
58 | #if defined(__ia64__) | |
59 | if (efi_range_is_wc(vma->vm_start, vma->vm_end - | |
60 | vma->vm_start)) | |
61 | tmp = pgprot_writecombine(tmp); | |
62 | else | |
63 | tmp = pgprot_noncached(tmp); | |
64 | #endif | |
65 | return tmp; | |
66 | } | |
67 | ||
1da177e4 LT |
68 | /** |
69 | * \c nopage method for AGP virtual memory. | |
70 | * | |
71 | * \param vma virtual memory area. | |
72 | * \param address access address. | |
73 | * \return pointer to the page structure. | |
b5e89ed5 | 74 | * |
1da177e4 LT |
75 | * Find the right map and if it's AGP memory find the real physical page to |
76 | * map, get the page, increment the use count and return it. | |
77 | */ | |
78 | #if __OS_HAS_AGP | |
79 | static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 80 | unsigned long address) |
1da177e4 | 81 | { |
b5e89ed5 | 82 | drm_file_t *priv = vma->vm_file->private_data; |
1da177e4 | 83 | drm_device_t *dev = priv->head->dev; |
b5e89ed5 DA |
84 | drm_map_t *map = NULL; |
85 | drm_map_list_t *r_list; | |
8d153f71 | 86 | drm_hash_item_t *hash; |
1da177e4 LT |
87 | |
88 | /* | |
b5e89ed5 DA |
89 | * Find the right map |
90 | */ | |
1da177e4 LT |
91 | if (!drm_core_has_AGP(dev)) |
92 | goto vm_nopage_error; | |
93 | ||
b5e89ed5 DA |
94 | if (!dev->agp || !dev->agp->cant_use_aperture) |
95 | goto vm_nopage_error; | |
1da177e4 | 96 | |
1545085a | 97 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) |
8d153f71 TH |
98 | goto vm_nopage_error; |
99 | ||
100 | r_list = drm_hash_entry(hash, drm_map_list_t, hash); | |
101 | map = r_list->map; | |
1da177e4 LT |
102 | |
103 | if (map && map->type == _DRM_AGP) { | |
104 | unsigned long offset = address - vma->vm_start; | |
d1f2b55a | 105 | unsigned long baddr = map->offset + offset; |
1da177e4 LT |
106 | struct drm_agp_mem *agpmem; |
107 | struct page *page; | |
108 | ||
109 | #ifdef __alpha__ | |
110 | /* | |
b5e89ed5 DA |
111 | * Adjust to a bus-relative address |
112 | */ | |
1da177e4 LT |
113 | baddr -= dev->hose->mem_space->start; |
114 | #endif | |
115 | ||
116 | /* | |
b5e89ed5 DA |
117 | * It's AGP memory - find the real physical page to map |
118 | */ | |
119 | for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) { | |
1da177e4 | 120 | if (agpmem->bound <= baddr && |
b5e89ed5 | 121 | agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) |
1da177e4 LT |
122 | break; |
123 | } | |
124 | ||
b5e89ed5 DA |
125 | if (!agpmem) |
126 | goto vm_nopage_error; | |
1da177e4 LT |
127 | |
128 | /* | |
b5e89ed5 DA |
129 | * Get the page, inc the use count, and return it |
130 | */ | |
1da177e4 LT |
131 | offset = (baddr - agpmem->bound) >> PAGE_SHIFT; |
132 | page = virt_to_page(__va(agpmem->memory->memory[offset])); | |
133 | get_page(page); | |
134 | ||
b5e89ed5 DA |
135 | DRM_DEBUG |
136 | ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n", | |
137 | baddr, __va(agpmem->memory->memory[offset]), offset, | |
138 | page_count(page)); | |
1da177e4 LT |
139 | |
140 | return page; | |
b5e89ed5 DA |
141 | } |
142 | vm_nopage_error: | |
143 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
1da177e4 | 144 | } |
b5e89ed5 | 145 | #else /* __OS_HAS_AGP */ |
1da177e4 | 146 | static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, |
b5e89ed5 | 147 | unsigned long address) |
1da177e4 LT |
148 | { |
149 | return NOPAGE_SIGBUS; | |
150 | } | |
b5e89ed5 | 151 | #endif /* __OS_HAS_AGP */ |
1da177e4 LT |
152 | |
153 | /** | |
154 | * \c nopage method for shared virtual memory. | |
155 | * | |
156 | * \param vma virtual memory area. | |
157 | * \param address access address. | |
158 | * \return pointer to the page structure. | |
b5e89ed5 | 159 | * |
1da177e4 LT |
160 | * Get the the mapping, find the real physical page to map, get the page, and |
161 | * return it. | |
162 | */ | |
163 | static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 164 | unsigned long address) |
1da177e4 | 165 | { |
b5e89ed5 DA |
166 | drm_map_t *map = (drm_map_t *) vma->vm_private_data; |
167 | unsigned long offset; | |
168 | unsigned long i; | |
169 | struct page *page; | |
1da177e4 | 170 | |
b5e89ed5 DA |
171 | if (address > vma->vm_end) |
172 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
173 | if (!map) | |
cd54e7e5 | 174 | return NOPAGE_SIGBUS; /* Nothing allocated */ |
1da177e4 | 175 | |
b5e89ed5 | 176 | offset = address - vma->vm_start; |
1da177e4 | 177 | i = (unsigned long)map->handle + offset; |
b5e89ed5 | 178 | page = (map->type == _DRM_CONSISTENT) ? |
5fb4dc9b | 179 | virt_to_page((void *)i) : vmalloc_to_page((void *)i); |
1da177e4 | 180 | if (!page) |
cd54e7e5 | 181 | return NOPAGE_SIGBUS; |
1da177e4 LT |
182 | get_page(page); |
183 | ||
184 | DRM_DEBUG("shm_nopage 0x%lx\n", address); | |
185 | return page; | |
186 | } | |
187 | ||
1da177e4 LT |
188 | /** |
189 | * \c close method for shared virtual memory. | |
b5e89ed5 | 190 | * |
1da177e4 | 191 | * \param vma virtual memory area. |
b5e89ed5 | 192 | * |
1da177e4 LT |
193 | * Deletes map information if we are the last |
194 | * person to close a mapping and it's not in the global maplist. | |
195 | */ | |
c94f7029 | 196 | static void drm_vm_shm_close(struct vm_area_struct *vma) |
1da177e4 | 197 | { |
b5e89ed5 DA |
198 | drm_file_t *priv = vma->vm_file->private_data; |
199 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
200 | drm_vma_entry_t *pt, *prev, *next; |
201 | drm_map_t *map; | |
202 | drm_map_list_t *r_list; | |
203 | struct list_head *list; | |
204 | int found_maps = 0; | |
205 | ||
206 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
207 | vma->vm_start, vma->vm_end - vma->vm_start); | |
208 | atomic_dec(&dev->vma_count); | |
209 | ||
210 | map = vma->vm_private_data; | |
211 | ||
30e2fb18 | 212 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
213 | for (pt = dev->vmalist, prev = NULL; pt; pt = next) { |
214 | next = pt->next; | |
b5e89ed5 DA |
215 | if (pt->vma->vm_private_data == map) |
216 | found_maps++; | |
1da177e4 LT |
217 | if (pt->vma == vma) { |
218 | if (prev) { | |
219 | prev->next = pt->next; | |
220 | } else { | |
221 | dev->vmalist = pt->next; | |
222 | } | |
223 | drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); | |
224 | } else { | |
225 | prev = pt; | |
226 | } | |
227 | } | |
228 | /* We were the only map that was found */ | |
b5e89ed5 | 229 | if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { |
1da177e4 LT |
230 | /* Check to see if we are in the maplist, if we are not, then |
231 | * we delete this mappings information. | |
232 | */ | |
233 | found_maps = 0; | |
234 | list = &dev->maplist->head; | |
235 | list_for_each(list, &dev->maplist->head) { | |
236 | r_list = list_entry(list, drm_map_list_t, head); | |
b5e89ed5 DA |
237 | if (r_list->map == map) |
238 | found_maps++; | |
1da177e4 LT |
239 | } |
240 | ||
b5e89ed5 | 241 | if (!found_maps) { |
9c8da5eb DA |
242 | drm_dma_handle_t dmah; |
243 | ||
1da177e4 LT |
244 | switch (map->type) { |
245 | case _DRM_REGISTERS: | |
246 | case _DRM_FRAME_BUFFER: | |
247 | if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { | |
248 | int retcode; | |
249 | retcode = mtrr_del(map->mtrr, | |
250 | map->offset, | |
251 | map->size); | |
252 | DRM_DEBUG("mtrr_del = %d\n", retcode); | |
253 | } | |
004a7727 | 254 | iounmap(map->handle); |
1da177e4 LT |
255 | break; |
256 | case _DRM_SHM: | |
257 | vfree(map->handle); | |
258 | break; | |
259 | case _DRM_AGP: | |
260 | case _DRM_SCATTER_GATHER: | |
261 | break; | |
2d0f9eaf | 262 | case _DRM_CONSISTENT: |
9c8da5eb DA |
263 | dmah.vaddr = map->handle; |
264 | dmah.busaddr = map->offset; | |
265 | dmah.size = map->size; | |
266 | __drm_pci_free(dev, &dmah); | |
2d0f9eaf | 267 | break; |
1da177e4 LT |
268 | } |
269 | drm_free(map, sizeof(*map), DRM_MEM_MAPS); | |
270 | } | |
271 | } | |
30e2fb18 | 272 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
273 | } |
274 | ||
275 | /** | |
276 | * \c nopage method for DMA virtual memory. | |
277 | * | |
278 | * \param vma virtual memory area. | |
279 | * \param address access address. | |
280 | * \return pointer to the page structure. | |
b5e89ed5 | 281 | * |
1da177e4 LT |
282 | * Determine the page number from the page offset and get it from drm_device_dma::pagelist. |
283 | */ | |
284 | static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 285 | unsigned long address) |
1da177e4 | 286 | { |
b5e89ed5 DA |
287 | drm_file_t *priv = vma->vm_file->private_data; |
288 | drm_device_t *dev = priv->head->dev; | |
289 | drm_device_dma_t *dma = dev->dma; | |
290 | unsigned long offset; | |
291 | unsigned long page_nr; | |
292 | struct page *page; | |
293 | ||
294 | if (!dma) | |
295 | return NOPAGE_SIGBUS; /* Error */ | |
296 | if (address > vma->vm_end) | |
297 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
298 | if (!dma->pagelist) | |
cd54e7e5 | 299 | return NOPAGE_SIGBUS; /* Nothing allocated */ |
b5e89ed5 DA |
300 | |
301 | offset = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ | |
302 | page_nr = offset >> PAGE_SHIFT; | |
303 | page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK)))); | |
1da177e4 LT |
304 | |
305 | get_page(page); | |
306 | ||
307 | DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr); | |
308 | return page; | |
309 | } | |
310 | ||
311 | /** | |
312 | * \c nopage method for scatter-gather virtual memory. | |
313 | * | |
314 | * \param vma virtual memory area. | |
315 | * \param address access address. | |
316 | * \return pointer to the page structure. | |
b5e89ed5 | 317 | * |
1da177e4 LT |
318 | * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. |
319 | */ | |
320 | static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 321 | unsigned long address) |
1da177e4 | 322 | { |
b5e89ed5 | 323 | drm_map_t *map = (drm_map_t *) vma->vm_private_data; |
1da177e4 LT |
324 | drm_file_t *priv = vma->vm_file->private_data; |
325 | drm_device_t *dev = priv->head->dev; | |
326 | drm_sg_mem_t *entry = dev->sg; | |
327 | unsigned long offset; | |
328 | unsigned long map_offset; | |
329 | unsigned long page_offset; | |
330 | struct page *page; | |
331 | ||
b5e89ed5 DA |
332 | if (!entry) |
333 | return NOPAGE_SIGBUS; /* Error */ | |
334 | if (address > vma->vm_end) | |
335 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
336 | if (!entry->pagelist) | |
cd54e7e5 | 337 | return NOPAGE_SIGBUS; /* Nothing allocated */ |
1da177e4 LT |
338 | |
339 | offset = address - vma->vm_start; | |
d1f2b55a | 340 | map_offset = map->offset - (unsigned long)dev->sg->virtual; |
1da177e4 LT |
341 | page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
342 | page = entry->pagelist[page_offset]; | |
343 | get_page(page); | |
344 | ||
345 | return page; | |
346 | } | |
347 | ||
1da177e4 | 348 | static struct page *drm_vm_nopage(struct vm_area_struct *vma, |
b5e89ed5 DA |
349 | unsigned long address, int *type) |
350 | { | |
351 | if (type) | |
352 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
353 | return drm_do_vm_nopage(vma, address); |
354 | } | |
355 | ||
356 | static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
357 | unsigned long address, int *type) |
358 | { | |
359 | if (type) | |
360 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
361 | return drm_do_vm_shm_nopage(vma, address); |
362 | } | |
363 | ||
364 | static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
365 | unsigned long address, int *type) |
366 | { | |
367 | if (type) | |
368 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
369 | return drm_do_vm_dma_nopage(vma, address); |
370 | } | |
371 | ||
372 | static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
373 | unsigned long address, int *type) |
374 | { | |
375 | if (type) | |
376 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
377 | return drm_do_vm_sg_nopage(vma, address); |
378 | } | |
379 | ||
1da177e4 | 380 | /** AGP virtual memory operations */ |
b5e89ed5 | 381 | static struct vm_operations_struct drm_vm_ops = { |
1da177e4 | 382 | .nopage = drm_vm_nopage, |
b5e89ed5 DA |
383 | .open = drm_vm_open, |
384 | .close = drm_vm_close, | |
1da177e4 LT |
385 | }; |
386 | ||
387 | /** Shared virtual memory operations */ | |
b5e89ed5 | 388 | static struct vm_operations_struct drm_vm_shm_ops = { |
1da177e4 | 389 | .nopage = drm_vm_shm_nopage, |
b5e89ed5 DA |
390 | .open = drm_vm_open, |
391 | .close = drm_vm_shm_close, | |
1da177e4 LT |
392 | }; |
393 | ||
394 | /** DMA virtual memory operations */ | |
b5e89ed5 | 395 | static struct vm_operations_struct drm_vm_dma_ops = { |
1da177e4 | 396 | .nopage = drm_vm_dma_nopage, |
b5e89ed5 DA |
397 | .open = drm_vm_open, |
398 | .close = drm_vm_close, | |
1da177e4 LT |
399 | }; |
400 | ||
401 | /** Scatter-gather virtual memory operations */ | |
b5e89ed5 | 402 | static struct vm_operations_struct drm_vm_sg_ops = { |
1da177e4 | 403 | .nopage = drm_vm_sg_nopage, |
b5e89ed5 DA |
404 | .open = drm_vm_open, |
405 | .close = drm_vm_close, | |
1da177e4 LT |
406 | }; |
407 | ||
1da177e4 LT |
408 | /** |
409 | * \c open method for shared virtual memory. | |
b5e89ed5 | 410 | * |
1da177e4 | 411 | * \param vma virtual memory area. |
b5e89ed5 | 412 | * |
1da177e4 LT |
413 | * Create a new drm_vma_entry structure as the \p vma private data entry and |
414 | * add it to drm_device::vmalist. | |
415 | */ | |
c94f7029 | 416 | static void drm_vm_open(struct vm_area_struct *vma) |
1da177e4 | 417 | { |
b5e89ed5 DA |
418 | drm_file_t *priv = vma->vm_file->private_data; |
419 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
420 | drm_vma_entry_t *vma_entry; |
421 | ||
422 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
423 | vma->vm_start, vma->vm_end - vma->vm_start); | |
424 | atomic_inc(&dev->vma_count); | |
425 | ||
426 | vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS); | |
427 | if (vma_entry) { | |
30e2fb18 | 428 | mutex_lock(&dev->struct_mutex); |
b5e89ed5 | 429 | vma_entry->vma = vma; |
1da177e4 | 430 | vma_entry->next = dev->vmalist; |
b5e89ed5 DA |
431 | vma_entry->pid = current->pid; |
432 | dev->vmalist = vma_entry; | |
30e2fb18 | 433 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
434 | } |
435 | } | |
436 | ||
437 | /** | |
438 | * \c close method for all virtual memory types. | |
b5e89ed5 | 439 | * |
1da177e4 | 440 | * \param vma virtual memory area. |
b5e89ed5 | 441 | * |
1da177e4 LT |
442 | * Search the \p vma private data entry in drm_device::vmalist, unlink it, and |
443 | * free it. | |
444 | */ | |
c94f7029 | 445 | static void drm_vm_close(struct vm_area_struct *vma) |
1da177e4 | 446 | { |
b5e89ed5 DA |
447 | drm_file_t *priv = vma->vm_file->private_data; |
448 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
449 | drm_vma_entry_t *pt, *prev; |
450 | ||
451 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
452 | vma->vm_start, vma->vm_end - vma->vm_start); | |
453 | atomic_dec(&dev->vma_count); | |
454 | ||
30e2fb18 | 455 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
456 | for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) { |
457 | if (pt->vma == vma) { | |
458 | if (prev) { | |
459 | prev->next = pt->next; | |
460 | } else { | |
461 | dev->vmalist = pt->next; | |
462 | } | |
463 | drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); | |
464 | break; | |
465 | } | |
466 | } | |
30e2fb18 | 467 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
468 | } |
469 | ||
470 | /** | |
471 | * mmap DMA memory. | |
472 | * | |
473 | * \param filp file pointer. | |
474 | * \param vma virtual memory area. | |
475 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 476 | * |
1da177e4 LT |
477 | * Sets the virtual memory area operations structure to vm_dma_ops, the file |
478 | * pointer, and calls vm_open(). | |
479 | */ | |
c94f7029 | 480 | static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 481 | { |
b5e89ed5 DA |
482 | drm_file_t *priv = filp->private_data; |
483 | drm_device_t *dev; | |
1da177e4 | 484 | drm_device_dma_t *dma; |
b5e89ed5 | 485 | unsigned long length = vma->vm_end - vma->vm_start; |
1da177e4 LT |
486 | |
487 | lock_kernel(); | |
b5e89ed5 DA |
488 | dev = priv->head->dev; |
489 | dma = dev->dma; | |
1545085a TH |
490 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
491 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 492 | |
b5e89ed5 | 493 | /* Length must match exact page count */ |
1da177e4 LT |
494 | if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
495 | unlock_kernel(); | |
496 | return -EINVAL; | |
497 | } | |
498 | unlock_kernel(); | |
499 | ||
3417f33e GS |
500 | if (!capable(CAP_SYS_ADMIN) && |
501 | (dma->flags & _DRM_DMA_USE_PCI_RO)) { | |
502 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
503 | #if defined(__i386__) || defined(__x86_64__) | |
504 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
505 | #else | |
506 | /* Ye gads this is ugly. With more thought | |
507 | we could move this up higher and use | |
508 | `protection_map' instead. */ | |
509 | vma->vm_page_prot = | |
510 | __pgprot(pte_val | |
511 | (pte_wrprotect | |
512 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
513 | #endif | |
514 | } | |
515 | ||
b5e89ed5 | 516 | vma->vm_ops = &drm_vm_dma_ops; |
1da177e4 | 517 | |
b5e89ed5 | 518 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
1da177e4 | 519 | |
b5e89ed5 | 520 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
1da177e4 LT |
521 | drm_vm_open(vma); |
522 | return 0; | |
523 | } | |
524 | ||
b5e89ed5 | 525 | unsigned long drm_core_get_map_ofs(drm_map_t * map) |
1da177e4 LT |
526 | { |
527 | return map->offset; | |
528 | } | |
b5e89ed5 | 529 | |
1da177e4 LT |
530 | EXPORT_SYMBOL(drm_core_get_map_ofs); |
531 | ||
532 | unsigned long drm_core_get_reg_ofs(struct drm_device *dev) | |
533 | { | |
534 | #ifdef __alpha__ | |
535 | return dev->hose->dense_mem_base - dev->hose->mem_space->start; | |
536 | #else | |
537 | return 0; | |
538 | #endif | |
539 | } | |
b5e89ed5 | 540 | |
1da177e4 LT |
541 | EXPORT_SYMBOL(drm_core_get_reg_ofs); |
542 | ||
543 | /** | |
544 | * mmap DMA memory. | |
545 | * | |
546 | * \param filp file pointer. | |
547 | * \param vma virtual memory area. | |
548 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 549 | * |
1da177e4 LT |
550 | * If the virtual memory area has no offset associated with it then it's a DMA |
551 | * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, | |
552 | * checks that the restricted flag is not set, sets the virtual memory operations | |
553 | * according to the mapping type and remaps the pages. Finally sets the file | |
554 | * pointer and calls vm_open(). | |
555 | */ | |
556 | int drm_mmap(struct file *filp, struct vm_area_struct *vma) | |
557 | { | |
b5e89ed5 DA |
558 | drm_file_t *priv = filp->private_data; |
559 | drm_device_t *dev = priv->head->dev; | |
560 | drm_map_t *map = NULL; | |
b5e89ed5 | 561 | unsigned long offset = 0; |
8d153f71 | 562 | drm_hash_item_t *hash; |
1da177e4 | 563 | |
1545085a TH |
564 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
565 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 566 | |
b5e89ed5 DA |
567 | if (!priv->authenticated) |
568 | return -EACCES; | |
1da177e4 LT |
569 | |
570 | /* We check for "dma". On Apple's UniNorth, it's valid to have | |
571 | * the AGP mapped at physical address 0 | |
572 | * --BenH. | |
573 | */ | |
1545085a | 574 | if (!vma->vm_pgoff |
1da177e4 | 575 | #if __OS_HAS_AGP |
b5e89ed5 DA |
576 | && (!dev->agp |
577 | || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) | |
1da177e4 LT |
578 | #endif |
579 | ) | |
580 | return drm_mmap_dma(filp, vma); | |
581 | ||
1545085a | 582 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { |
8d153f71 TH |
583 | DRM_ERROR("Could not find map\n"); |
584 | return -EINVAL; | |
1da177e4 LT |
585 | } |
586 | ||
8d153f71 | 587 | map = drm_hash_entry(hash, drm_map_list_t, hash)->map; |
b5e89ed5 | 588 | if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) |
1da177e4 LT |
589 | return -EPERM; |
590 | ||
b5e89ed5 DA |
591 | /* Check for valid size. */ |
592 | if (map->size != vma->vm_end - vma->vm_start) | |
593 | return -EINVAL; | |
1da177e4 LT |
594 | |
595 | if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { | |
596 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
597 | #if defined(__i386__) || defined(__x86_64__) | |
598 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
599 | #else | |
b5e89ed5 DA |
600 | /* Ye gads this is ugly. With more thought |
601 | we could move this up higher and use | |
602 | `protection_map' instead. */ | |
603 | vma->vm_page_prot = | |
604 | __pgprot(pte_val | |
605 | (pte_wrprotect | |
606 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
1da177e4 LT |
607 | #endif |
608 | } | |
609 | ||
610 | switch (map->type) { | |
b5e89ed5 DA |
611 | case _DRM_AGP: |
612 | if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) { | |
613 | /* | |
614 | * On some platforms we can't talk to bus dma address from the CPU, so for | |
615 | * memory of type DRM_AGP, we'll deal with sorting out the real physical | |
616 | * pages and mappings in nopage() | |
617 | */ | |
1da177e4 | 618 | #if defined(__powerpc__) |
b5e89ed5 | 619 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; |
1da177e4 | 620 | #endif |
b5e89ed5 DA |
621 | vma->vm_ops = &drm_vm_ops; |
622 | break; | |
623 | } | |
624 | /* fall through to _DRM_FRAME_BUFFER... */ | |
1da177e4 LT |
625 | case _DRM_FRAME_BUFFER: |
626 | case _DRM_REGISTERS: | |
1da177e4 | 627 | offset = dev->driver->get_reg_ofs(dev); |
5cc7f9ab DA |
628 | vma->vm_flags |= VM_IO; /* not in core dump */ |
629 | vma->vm_page_prot = drm_io_prot(map->type, vma); | |
1da177e4 | 630 | #ifdef __sparc__ |
14778d90 | 631 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
3d77461e | 632 | if (io_remap_pfn_range(vma, vma->vm_start, |
b5e89ed5 DA |
633 | (map->offset + offset) >> PAGE_SHIFT, |
634 | vma->vm_end - vma->vm_start, | |
635 | vma->vm_page_prot)) | |
1da177e4 LT |
636 | #else |
637 | if (io_remap_pfn_range(vma, vma->vm_start, | |
b5e89ed5 DA |
638 | (map->offset + offset) >> PAGE_SHIFT, |
639 | vma->vm_end - vma->vm_start, | |
640 | vma->vm_page_prot)) | |
1da177e4 | 641 | #endif |
b5e89ed5 | 642 | return -EAGAIN; |
1da177e4 LT |
643 | DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," |
644 | " offset = 0x%lx\n", | |
645 | map->type, | |
d1f2b55a | 646 | vma->vm_start, vma->vm_end, map->offset + offset); |
1da177e4 LT |
647 | vma->vm_ops = &drm_vm_ops; |
648 | break; | |
649 | case _DRM_SHM: | |
2d0f9eaf DA |
650 | case _DRM_CONSISTENT: |
651 | /* Consistent memory is really like shared memory. It's only | |
652 | * allocate in a different way */ | |
1da177e4 LT |
653 | vma->vm_ops = &drm_vm_shm_ops; |
654 | vma->vm_private_data = (void *)map; | |
b5e89ed5 DA |
655 | /* Don't let this area swap. Change when |
656 | DRM_KERNEL advisory is supported. */ | |
1da177e4 | 657 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
658 | break; |
659 | case _DRM_SCATTER_GATHER: | |
660 | vma->vm_ops = &drm_vm_sg_ops; | |
661 | vma->vm_private_data = (void *)map; | |
1da177e4 | 662 | vma->vm_flags |= VM_RESERVED; |
b5e89ed5 | 663 | break; |
1da177e4 LT |
664 | default: |
665 | return -EINVAL; /* This should never happen. */ | |
666 | } | |
b5e89ed5 | 667 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
1da177e4 | 668 | |
b5e89ed5 | 669 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
1da177e4 LT |
670 | drm_vm_open(vma); |
671 | return 0; | |
672 | } | |
b5e89ed5 | 673 | |
1da177e4 | 674 | EXPORT_SYMBOL(drm_mmap); |