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> | |
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 LT |
40 | #endif |
41 | ||
c94f7029 DA |
42 | static void drm_vm_open(struct vm_area_struct *vma); |
43 | static void drm_vm_close(struct vm_area_struct *vma); | |
1da177e4 | 44 | |
0bead7cd | 45 | static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma) |
5cc7f9ab DA |
46 | { |
47 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); | |
48 | ||
49 | #if defined(__i386__) || defined(__x86_64__) | |
50 | if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) { | |
51 | pgprot_val(tmp) |= _PAGE_PCD; | |
52 | pgprot_val(tmp) &= ~_PAGE_PWT; | |
53 | } | |
54 | #elif defined(__powerpc__) | |
55 | pgprot_val(tmp) |= _PAGE_NO_CACHE; | |
56 | if (map_type == _DRM_REGISTERS) | |
57 | pgprot_val(tmp) |= _PAGE_GUARDED; | |
6876b3ba | 58 | #elif defined(__ia64__) |
5cc7f9ab DA |
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); | |
6876b3ba BH |
64 | #elif defined(__sparc__) |
65 | tmp = pgprot_noncached(tmp); | |
66 | #endif | |
67 | return tmp; | |
68 | } | |
69 | ||
70 | static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma) | |
71 | { | |
72 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); | |
73 | ||
74 | #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) | |
75 | tmp |= _PAGE_NO_CACHE; | |
5cc7f9ab DA |
76 | #endif |
77 | return tmp; | |
78 | } | |
79 | ||
1da177e4 | 80 | /** |
ca0b07d9 | 81 | * \c fault method for AGP virtual memory. |
1da177e4 LT |
82 | * |
83 | * \param vma virtual memory area. | |
84 | * \param address access address. | |
85 | * \return pointer to the page structure. | |
b5e89ed5 | 86 | * |
1da177e4 LT |
87 | * Find the right map and if it's AGP memory find the real physical page to |
88 | * map, get the page, increment the use count and return it. | |
89 | */ | |
90 | #if __OS_HAS_AGP | |
ca0b07d9 | 91 | static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1da177e4 | 92 | { |
84b1fd10 | 93 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 94 | struct drm_device *dev = priv->minor->dev; |
f77d390c | 95 | struct drm_local_map *map = NULL; |
55910517 | 96 | struct drm_map_list *r_list; |
e0be428e | 97 | struct drm_hash_item *hash; |
1da177e4 LT |
98 | |
99 | /* | |
b5e89ed5 DA |
100 | * Find the right map |
101 | */ | |
1da177e4 | 102 | if (!drm_core_has_AGP(dev)) |
ca0b07d9 | 103 | goto vm_fault_error; |
1da177e4 | 104 | |
b5e89ed5 | 105 | if (!dev->agp || !dev->agp->cant_use_aperture) |
ca0b07d9 | 106 | goto vm_fault_error; |
1da177e4 | 107 | |
1545085a | 108 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) |
ca0b07d9 | 109 | goto vm_fault_error; |
8d153f71 | 110 | |
55910517 | 111 | r_list = drm_hash_entry(hash, struct drm_map_list, hash); |
8d153f71 | 112 | map = r_list->map; |
1da177e4 LT |
113 | |
114 | if (map && map->type == _DRM_AGP) { | |
ca0b07d9 NP |
115 | /* |
116 | * Using vm_pgoff as a selector forces us to use this unusual | |
117 | * addressing scheme. | |
118 | */ | |
41c2e75e BH |
119 | resource_size_t offset = (unsigned long)vmf->virtual_address - |
120 | vma->vm_start; | |
121 | resource_size_t baddr = map->offset + offset; | |
1da177e4 LT |
122 | struct drm_agp_mem *agpmem; |
123 | struct page *page; | |
124 | ||
125 | #ifdef __alpha__ | |
126 | /* | |
b5e89ed5 DA |
127 | * Adjust to a bus-relative address |
128 | */ | |
1da177e4 LT |
129 | baddr -= dev->hose->mem_space->start; |
130 | #endif | |
131 | ||
132 | /* | |
b5e89ed5 DA |
133 | * It's AGP memory - find the real physical page to map |
134 | */ | |
bd1b331f | 135 | list_for_each_entry(agpmem, &dev->agp->memory, head) { |
1da177e4 | 136 | if (agpmem->bound <= baddr && |
b5e89ed5 | 137 | agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) |
1da177e4 LT |
138 | break; |
139 | } | |
140 | ||
b5e89ed5 | 141 | if (!agpmem) |
ca0b07d9 | 142 | goto vm_fault_error; |
1da177e4 LT |
143 | |
144 | /* | |
b5e89ed5 DA |
145 | * Get the page, inc the use count, and return it |
146 | */ | |
1da177e4 | 147 | offset = (baddr - agpmem->bound) >> PAGE_SHIFT; |
07613ba2 | 148 | page = agpmem->memory->pages[offset]; |
1da177e4 | 149 | get_page(page); |
ca0b07d9 | 150 | vmf->page = page; |
1da177e4 | 151 | |
b5e89ed5 | 152 | DRM_DEBUG |
41c2e75e BH |
153 | ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n", |
154 | (unsigned long long)baddr, | |
07613ba2 | 155 | agpmem->memory->pages[offset], |
41c2e75e | 156 | (unsigned long long)offset, |
b5e89ed5 | 157 | page_count(page)); |
ca0b07d9 | 158 | return 0; |
b5e89ed5 | 159 | } |
ca0b07d9 NP |
160 | vm_fault_error: |
161 | return VM_FAULT_SIGBUS; /* Disallow mremap */ | |
1da177e4 | 162 | } |
b5e89ed5 | 163 | #else /* __OS_HAS_AGP */ |
ca0b07d9 | 164 | static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1da177e4 | 165 | { |
ca0b07d9 | 166 | return VM_FAULT_SIGBUS; |
1da177e4 | 167 | } |
b5e89ed5 | 168 | #endif /* __OS_HAS_AGP */ |
1da177e4 LT |
169 | |
170 | /** | |
171 | * \c nopage method for shared virtual memory. | |
172 | * | |
173 | * \param vma virtual memory area. | |
174 | * \param address access address. | |
175 | * \return pointer to the page structure. | |
b5e89ed5 | 176 | * |
59c51591 | 177 | * Get the mapping, find the real physical page to map, get the page, and |
1da177e4 LT |
178 | * return it. |
179 | */ | |
ca0b07d9 | 180 | static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1da177e4 | 181 | { |
f77d390c | 182 | struct drm_local_map *map = vma->vm_private_data; |
b5e89ed5 DA |
183 | unsigned long offset; |
184 | unsigned long i; | |
185 | struct page *page; | |
1da177e4 | 186 | |
b5e89ed5 | 187 | if (!map) |
ca0b07d9 | 188 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
1da177e4 | 189 | |
ca0b07d9 | 190 | offset = (unsigned long)vmf->virtual_address - vma->vm_start; |
1da177e4 | 191 | i = (unsigned long)map->handle + offset; |
38315878 | 192 | page = vmalloc_to_page((void *)i); |
1da177e4 | 193 | if (!page) |
ca0b07d9 | 194 | return VM_FAULT_SIGBUS; |
1da177e4 | 195 | get_page(page); |
ca0b07d9 | 196 | vmf->page = page; |
1da177e4 | 197 | |
ca0b07d9 NP |
198 | DRM_DEBUG("shm_fault 0x%lx\n", offset); |
199 | return 0; | |
1da177e4 LT |
200 | } |
201 | ||
1da177e4 LT |
202 | /** |
203 | * \c close method for shared virtual memory. | |
b5e89ed5 | 204 | * |
1da177e4 | 205 | * \param vma virtual memory area. |
b5e89ed5 | 206 | * |
1da177e4 LT |
207 | * Deletes map information if we are the last |
208 | * person to close a mapping and it's not in the global maplist. | |
209 | */ | |
c94f7029 | 210 | static void drm_vm_shm_close(struct vm_area_struct *vma) |
1da177e4 | 211 | { |
84b1fd10 | 212 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 213 | struct drm_device *dev = priv->minor->dev; |
8fc2fdf4 | 214 | struct drm_vma_entry *pt, *temp; |
f77d390c | 215 | struct drm_local_map *map; |
55910517 | 216 | struct drm_map_list *r_list; |
1da177e4 LT |
217 | int found_maps = 0; |
218 | ||
219 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
220 | vma->vm_start, vma->vm_end - vma->vm_start); | |
221 | atomic_dec(&dev->vma_count); | |
222 | ||
223 | map = vma->vm_private_data; | |
224 | ||
30e2fb18 | 225 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 226 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
b5e89ed5 DA |
227 | if (pt->vma->vm_private_data == map) |
228 | found_maps++; | |
1da177e4 | 229 | if (pt->vma == vma) { |
bd1b331f | 230 | list_del(&pt->head); |
9a298b2a | 231 | kfree(pt); |
1da177e4 LT |
232 | } |
233 | } | |
bd1b331f | 234 | |
1da177e4 | 235 | /* We were the only map that was found */ |
b5e89ed5 | 236 | if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { |
1da177e4 LT |
237 | /* Check to see if we are in the maplist, if we are not, then |
238 | * we delete this mappings information. | |
239 | */ | |
240 | found_maps = 0; | |
bd1b331f | 241 | list_for_each_entry(r_list, &dev->maplist, head) { |
b5e89ed5 DA |
242 | if (r_list->map == map) |
243 | found_maps++; | |
1da177e4 LT |
244 | } |
245 | ||
b5e89ed5 | 246 | if (!found_maps) { |
9c8da5eb DA |
247 | drm_dma_handle_t dmah; |
248 | ||
1da177e4 LT |
249 | switch (map->type) { |
250 | case _DRM_REGISTERS: | |
251 | case _DRM_FRAME_BUFFER: | |
252 | if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { | |
253 | int retcode; | |
254 | retcode = mtrr_del(map->mtrr, | |
255 | map->offset, | |
256 | map->size); | |
257 | DRM_DEBUG("mtrr_del = %d\n", retcode); | |
258 | } | |
004a7727 | 259 | iounmap(map->handle); |
1da177e4 LT |
260 | break; |
261 | case _DRM_SHM: | |
262 | vfree(map->handle); | |
263 | break; | |
264 | case _DRM_AGP: | |
265 | case _DRM_SCATTER_GATHER: | |
266 | break; | |
2d0f9eaf | 267 | case _DRM_CONSISTENT: |
9c8da5eb DA |
268 | dmah.vaddr = map->handle; |
269 | dmah.busaddr = map->offset; | |
270 | dmah.size = map->size; | |
271 | __drm_pci_free(dev, &dmah); | |
2d0f9eaf | 272 | break; |
a2c0a97b JB |
273 | case _DRM_GEM: |
274 | DRM_ERROR("tried to rmmap GEM object\n"); | |
275 | break; | |
1da177e4 | 276 | } |
9a298b2a | 277 | kfree(map); |
1da177e4 LT |
278 | } |
279 | } | |
30e2fb18 | 280 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
281 | } |
282 | ||
283 | /** | |
ca0b07d9 | 284 | * \c fault method for DMA virtual memory. |
1da177e4 LT |
285 | * |
286 | * \param vma virtual memory area. | |
287 | * \param address access address. | |
288 | * \return pointer to the page structure. | |
b5e89ed5 | 289 | * |
1da177e4 LT |
290 | * Determine the page number from the page offset and get it from drm_device_dma::pagelist. |
291 | */ | |
ca0b07d9 | 292 | static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1da177e4 | 293 | { |
84b1fd10 | 294 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 295 | struct drm_device *dev = priv->minor->dev; |
cdd55a29 | 296 | struct drm_device_dma *dma = dev->dma; |
b5e89ed5 DA |
297 | unsigned long offset; |
298 | unsigned long page_nr; | |
299 | struct page *page; | |
300 | ||
301 | if (!dma) | |
ca0b07d9 | 302 | return VM_FAULT_SIGBUS; /* Error */ |
b5e89ed5 | 303 | if (!dma->pagelist) |
ca0b07d9 | 304 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
b5e89ed5 | 305 | |
ca0b07d9 NP |
306 | offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ |
307 | page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */ | |
b5e89ed5 | 308 | page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK)))); |
1da177e4 LT |
309 | |
310 | get_page(page); | |
ca0b07d9 | 311 | vmf->page = page; |
1da177e4 | 312 | |
ca0b07d9 NP |
313 | DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr); |
314 | return 0; | |
1da177e4 LT |
315 | } |
316 | ||
317 | /** | |
ca0b07d9 | 318 | * \c fault method for scatter-gather virtual memory. |
1da177e4 LT |
319 | * |
320 | * \param vma virtual memory area. | |
321 | * \param address access address. | |
322 | * \return pointer to the page structure. | |
b5e89ed5 | 323 | * |
1da177e4 LT |
324 | * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. |
325 | */ | |
ca0b07d9 | 326 | static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1da177e4 | 327 | { |
f77d390c | 328 | struct drm_local_map *map = vma->vm_private_data; |
84b1fd10 | 329 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 330 | struct drm_device *dev = priv->minor->dev; |
55910517 | 331 | struct drm_sg_mem *entry = dev->sg; |
1da177e4 LT |
332 | unsigned long offset; |
333 | unsigned long map_offset; | |
334 | unsigned long page_offset; | |
335 | struct page *page; | |
336 | ||
b5e89ed5 | 337 | if (!entry) |
ca0b07d9 | 338 | return VM_FAULT_SIGBUS; /* Error */ |
b5e89ed5 | 339 | if (!entry->pagelist) |
ca0b07d9 | 340 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
1da177e4 | 341 | |
ca0b07d9 | 342 | offset = (unsigned long)vmf->virtual_address - vma->vm_start; |
d1f2b55a | 343 | map_offset = map->offset - (unsigned long)dev->sg->virtual; |
1da177e4 LT |
344 | page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
345 | page = entry->pagelist[page_offset]; | |
346 | get_page(page); | |
ca0b07d9 | 347 | vmf->page = page; |
1da177e4 | 348 | |
ca0b07d9 | 349 | return 0; |
1da177e4 LT |
350 | } |
351 | ||
ca0b07d9 | 352 | static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b5e89ed5 | 353 | { |
ca0b07d9 | 354 | return drm_do_vm_fault(vma, vmf); |
1da177e4 LT |
355 | } |
356 | ||
ca0b07d9 | 357 | static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b5e89ed5 | 358 | { |
ca0b07d9 | 359 | return drm_do_vm_shm_fault(vma, vmf); |
1da177e4 LT |
360 | } |
361 | ||
ca0b07d9 | 362 | static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b5e89ed5 | 363 | { |
ca0b07d9 | 364 | return drm_do_vm_dma_fault(vma, vmf); |
1da177e4 LT |
365 | } |
366 | ||
ca0b07d9 | 367 | static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b5e89ed5 | 368 | { |
ca0b07d9 | 369 | return drm_do_vm_sg_fault(vma, vmf); |
1da177e4 LT |
370 | } |
371 | ||
1da177e4 | 372 | /** AGP virtual memory operations */ |
f0f37e2f | 373 | static const struct vm_operations_struct drm_vm_ops = { |
ca0b07d9 | 374 | .fault = drm_vm_fault, |
b5e89ed5 DA |
375 | .open = drm_vm_open, |
376 | .close = drm_vm_close, | |
1da177e4 LT |
377 | }; |
378 | ||
379 | /** Shared virtual memory operations */ | |
f0f37e2f | 380 | static const struct vm_operations_struct drm_vm_shm_ops = { |
ca0b07d9 | 381 | .fault = drm_vm_shm_fault, |
b5e89ed5 DA |
382 | .open = drm_vm_open, |
383 | .close = drm_vm_shm_close, | |
1da177e4 LT |
384 | }; |
385 | ||
386 | /** DMA virtual memory operations */ | |
f0f37e2f | 387 | static const struct vm_operations_struct drm_vm_dma_ops = { |
ca0b07d9 | 388 | .fault = drm_vm_dma_fault, |
b5e89ed5 DA |
389 | .open = drm_vm_open, |
390 | .close = drm_vm_close, | |
1da177e4 LT |
391 | }; |
392 | ||
393 | /** Scatter-gather virtual memory operations */ | |
f0f37e2f | 394 | static const struct vm_operations_struct drm_vm_sg_ops = { |
ca0b07d9 | 395 | .fault = drm_vm_sg_fault, |
b5e89ed5 DA |
396 | .open = drm_vm_open, |
397 | .close = drm_vm_close, | |
1da177e4 LT |
398 | }; |
399 | ||
1da177e4 LT |
400 | /** |
401 | * \c open method for shared virtual memory. | |
b5e89ed5 | 402 | * |
1da177e4 | 403 | * \param vma virtual memory area. |
b5e89ed5 | 404 | * |
1da177e4 LT |
405 | * Create a new drm_vma_entry structure as the \p vma private data entry and |
406 | * add it to drm_device::vmalist. | |
407 | */ | |
a2c0a97b | 408 | void drm_vm_open_locked(struct vm_area_struct *vma) |
1da177e4 | 409 | { |
84b1fd10 | 410 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 411 | struct drm_device *dev = priv->minor->dev; |
8fc2fdf4 | 412 | struct drm_vma_entry *vma_entry; |
1da177e4 LT |
413 | |
414 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
415 | vma->vm_start, vma->vm_end - vma->vm_start); | |
416 | atomic_inc(&dev->vma_count); | |
417 | ||
9a298b2a | 418 | vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL); |
1da177e4 | 419 | if (vma_entry) { |
b5e89ed5 | 420 | vma_entry->vma = vma; |
b5e89ed5 | 421 | vma_entry->pid = current->pid; |
bd1b331f | 422 | list_add(&vma_entry->head, &dev->vmalist); |
1da177e4 LT |
423 | } |
424 | } | |
425 | ||
d7d8aac7 TH |
426 | static void drm_vm_open(struct vm_area_struct *vma) |
427 | { | |
84b1fd10 | 428 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 429 | struct drm_device *dev = priv->minor->dev; |
d7d8aac7 TH |
430 | |
431 | mutex_lock(&dev->struct_mutex); | |
432 | drm_vm_open_locked(vma); | |
433 | mutex_unlock(&dev->struct_mutex); | |
434 | } | |
435 | ||
1da177e4 LT |
436 | /** |
437 | * \c close method for all virtual memory types. | |
b5e89ed5 | 438 | * |
1da177e4 | 439 | * \param vma virtual memory area. |
b5e89ed5 | 440 | * |
1da177e4 LT |
441 | * Search the \p vma private data entry in drm_device::vmalist, unlink it, and |
442 | * free it. | |
443 | */ | |
c94f7029 | 444 | static void drm_vm_close(struct vm_area_struct *vma) |
1da177e4 | 445 | { |
84b1fd10 | 446 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 447 | struct drm_device *dev = priv->minor->dev; |
8fc2fdf4 | 448 | struct drm_vma_entry *pt, *temp; |
1da177e4 LT |
449 | |
450 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
451 | vma->vm_start, vma->vm_end - vma->vm_start); | |
452 | atomic_dec(&dev->vma_count); | |
453 | ||
30e2fb18 | 454 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 455 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
1da177e4 | 456 | if (pt->vma == vma) { |
bd1b331f | 457 | list_del(&pt->head); |
9a298b2a | 458 | kfree(pt); |
1da177e4 LT |
459 | break; |
460 | } | |
461 | } | |
30e2fb18 | 462 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
463 | } |
464 | ||
465 | /** | |
466 | * mmap DMA memory. | |
467 | * | |
6c340eac | 468 | * \param file_priv DRM file private. |
1da177e4 LT |
469 | * \param vma virtual memory area. |
470 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 471 | * |
1da177e4 LT |
472 | * Sets the virtual memory area operations structure to vm_dma_ops, the file |
473 | * pointer, and calls vm_open(). | |
474 | */ | |
c94f7029 | 475 | static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 476 | { |
84b1fd10 DA |
477 | struct drm_file *priv = filp->private_data; |
478 | struct drm_device *dev; | |
cdd55a29 | 479 | struct drm_device_dma *dma; |
b5e89ed5 | 480 | unsigned long length = vma->vm_end - vma->vm_start; |
1da177e4 | 481 | |
2c14f28b | 482 | dev = priv->minor->dev; |
b5e89ed5 | 483 | dma = dev->dma; |
1545085a TH |
484 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
485 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 486 | |
b5e89ed5 | 487 | /* Length must match exact page count */ |
1da177e4 | 488 | if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
1da177e4 LT |
489 | return -EINVAL; |
490 | } | |
1da177e4 | 491 | |
3417f33e GS |
492 | if (!capable(CAP_SYS_ADMIN) && |
493 | (dma->flags & _DRM_DMA_USE_PCI_RO)) { | |
494 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
495 | #if defined(__i386__) || defined(__x86_64__) | |
496 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
497 | #else | |
498 | /* Ye gads this is ugly. With more thought | |
499 | we could move this up higher and use | |
500 | `protection_map' instead. */ | |
501 | vma->vm_page_prot = | |
502 | __pgprot(pte_val | |
503 | (pte_wrprotect | |
504 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
505 | #endif | |
506 | } | |
507 | ||
b5e89ed5 | 508 | vma->vm_ops = &drm_vm_dma_ops; |
1da177e4 | 509 | |
b5e89ed5 | 510 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
2f98735c | 511 | vma->vm_flags |= VM_DONTEXPAND; |
1da177e4 | 512 | |
b5e89ed5 | 513 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
d7d8aac7 | 514 | drm_vm_open_locked(vma); |
1da177e4 LT |
515 | return 0; |
516 | } | |
517 | ||
41c2e75e | 518 | resource_size_t drm_core_get_map_ofs(struct drm_local_map * map) |
1da177e4 LT |
519 | { |
520 | return map->offset; | |
521 | } | |
b5e89ed5 | 522 | |
1da177e4 LT |
523 | EXPORT_SYMBOL(drm_core_get_map_ofs); |
524 | ||
41c2e75e | 525 | resource_size_t drm_core_get_reg_ofs(struct drm_device *dev) |
1da177e4 LT |
526 | { |
527 | #ifdef __alpha__ | |
528 | return dev->hose->dense_mem_base - dev->hose->mem_space->start; | |
529 | #else | |
530 | return 0; | |
531 | #endif | |
532 | } | |
b5e89ed5 | 533 | |
1da177e4 LT |
534 | EXPORT_SYMBOL(drm_core_get_reg_ofs); |
535 | ||
536 | /** | |
537 | * mmap DMA memory. | |
538 | * | |
6c340eac | 539 | * \param file_priv DRM file private. |
1da177e4 LT |
540 | * \param vma virtual memory area. |
541 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 542 | * |
1da177e4 LT |
543 | * If the virtual memory area has no offset associated with it then it's a DMA |
544 | * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, | |
545 | * checks that the restricted flag is not set, sets the virtual memory operations | |
546 | * according to the mapping type and remaps the pages. Finally sets the file | |
547 | * pointer and calls vm_open(). | |
548 | */ | |
a2c0a97b | 549 | int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 550 | { |
84b1fd10 | 551 | struct drm_file *priv = filp->private_data; |
2c14f28b | 552 | struct drm_device *dev = priv->minor->dev; |
f77d390c | 553 | struct drm_local_map *map = NULL; |
41c2e75e | 554 | resource_size_t offset = 0; |
e0be428e | 555 | struct drm_hash_item *hash; |
1da177e4 | 556 | |
1545085a TH |
557 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
558 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 559 | |
b5e89ed5 DA |
560 | if (!priv->authenticated) |
561 | return -EACCES; | |
1da177e4 LT |
562 | |
563 | /* We check for "dma". On Apple's UniNorth, it's valid to have | |
564 | * the AGP mapped at physical address 0 | |
565 | * --BenH. | |
566 | */ | |
1545085a | 567 | if (!vma->vm_pgoff |
1da177e4 | 568 | #if __OS_HAS_AGP |
b5e89ed5 DA |
569 | && (!dev->agp |
570 | || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) | |
1da177e4 LT |
571 | #endif |
572 | ) | |
573 | return drm_mmap_dma(filp, vma); | |
574 | ||
1545085a | 575 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { |
8d153f71 TH |
576 | DRM_ERROR("Could not find map\n"); |
577 | return -EINVAL; | |
1da177e4 LT |
578 | } |
579 | ||
55910517 | 580 | map = drm_hash_entry(hash, struct drm_map_list, hash)->map; |
b5e89ed5 | 581 | if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) |
1da177e4 LT |
582 | return -EPERM; |
583 | ||
b5e89ed5 | 584 | /* Check for valid size. */ |
54ba2f76 | 585 | if (map->size < vma->vm_end - vma->vm_start) |
b5e89ed5 | 586 | return -EINVAL; |
1da177e4 LT |
587 | |
588 | if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { | |
589 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
590 | #if defined(__i386__) || defined(__x86_64__) | |
591 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
592 | #else | |
b5e89ed5 DA |
593 | /* Ye gads this is ugly. With more thought |
594 | we could move this up higher and use | |
595 | `protection_map' instead. */ | |
596 | vma->vm_page_prot = | |
597 | __pgprot(pte_val | |
598 | (pte_wrprotect | |
599 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
1da177e4 LT |
600 | #endif |
601 | } | |
602 | ||
603 | switch (map->type) { | |
b5e89ed5 DA |
604 | case _DRM_AGP: |
605 | if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) { | |
606 | /* | |
607 | * On some platforms we can't talk to bus dma address from the CPU, so for | |
608 | * memory of type DRM_AGP, we'll deal with sorting out the real physical | |
ca0b07d9 | 609 | * pages and mappings in fault() |
b5e89ed5 | 610 | */ |
1da177e4 | 611 | #if defined(__powerpc__) |
b5e89ed5 | 612 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; |
1da177e4 | 613 | #endif |
b5e89ed5 DA |
614 | vma->vm_ops = &drm_vm_ops; |
615 | break; | |
616 | } | |
617 | /* fall through to _DRM_FRAME_BUFFER... */ | |
1da177e4 LT |
618 | case _DRM_FRAME_BUFFER: |
619 | case _DRM_REGISTERS: | |
1da177e4 | 620 | offset = dev->driver->get_reg_ofs(dev); |
5cc7f9ab DA |
621 | vma->vm_flags |= VM_IO; /* not in core dump */ |
622 | vma->vm_page_prot = drm_io_prot(map->type, vma); | |
3d77461e | 623 | if (io_remap_pfn_range(vma, vma->vm_start, |
b5e89ed5 DA |
624 | (map->offset + offset) >> PAGE_SHIFT, |
625 | vma->vm_end - vma->vm_start, | |
626 | vma->vm_page_prot)) | |
b5e89ed5 | 627 | return -EAGAIN; |
1da177e4 | 628 | DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," |
41c2e75e | 629 | " offset = 0x%llx\n", |
1da177e4 | 630 | map->type, |
41c2e75e | 631 | vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset)); |
1da177e4 LT |
632 | vma->vm_ops = &drm_vm_ops; |
633 | break; | |
2d0f9eaf | 634 | case _DRM_CONSISTENT: |
38315878 | 635 | /* Consistent memory is really like shared memory. But |
ca0b07d9 | 636 | * it's allocated in a different way, so avoid fault */ |
38315878 HD |
637 | if (remap_pfn_range(vma, vma->vm_start, |
638 | page_to_pfn(virt_to_page(map->handle)), | |
639 | vma->vm_end - vma->vm_start, vma->vm_page_prot)) | |
640 | return -EAGAIN; | |
6876b3ba | 641 | vma->vm_page_prot = drm_dma_prot(map->type, vma); |
38315878 HD |
642 | /* fall through to _DRM_SHM */ |
643 | case _DRM_SHM: | |
1da177e4 LT |
644 | vma->vm_ops = &drm_vm_shm_ops; |
645 | vma->vm_private_data = (void *)map; | |
b5e89ed5 DA |
646 | /* Don't let this area swap. Change when |
647 | DRM_KERNEL advisory is supported. */ | |
1da177e4 | 648 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
649 | break; |
650 | case _DRM_SCATTER_GATHER: | |
651 | vma->vm_ops = &drm_vm_sg_ops; | |
652 | vma->vm_private_data = (void *)map; | |
1da177e4 | 653 | vma->vm_flags |= VM_RESERVED; |
5ff64611 | 654 | vma->vm_page_prot = drm_dma_prot(map->type, vma); |
b5e89ed5 | 655 | break; |
1da177e4 LT |
656 | default: |
657 | return -EINVAL; /* This should never happen. */ | |
658 | } | |
b5e89ed5 | 659 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
2f98735c | 660 | vma->vm_flags |= VM_DONTEXPAND; |
1da177e4 | 661 | |
b5e89ed5 | 662 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
d7d8aac7 | 663 | drm_vm_open_locked(vma); |
1da177e4 LT |
664 | return 0; |
665 | } | |
b5e89ed5 | 666 | |
d7d8aac7 TH |
667 | int drm_mmap(struct file *filp, struct vm_area_struct *vma) |
668 | { | |
84b1fd10 | 669 | struct drm_file *priv = filp->private_data; |
2c14f28b | 670 | struct drm_device *dev = priv->minor->dev; |
d7d8aac7 TH |
671 | int ret; |
672 | ||
673 | mutex_lock(&dev->struct_mutex); | |
674 | ret = drm_mmap_locked(filp, vma); | |
675 | mutex_unlock(&dev->struct_mutex); | |
676 | ||
677 | return ret; | |
678 | } | |
1da177e4 | 679 | EXPORT_SYMBOL(drm_mmap); |