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 | ||
760285e7 | 36 | #include <drm/drmP.h> |
2d1a8a48 | 37 | #include <linux/export.h> |
03decbe5 | 38 | #include <linux/seq_file.h> |
1da177e4 LT |
39 | #if defined(__ia64__) |
40 | #include <linux/efi.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
1da177e4 | 42 | #endif |
2791ee85 | 43 | #include <asm/pgtable.h> |
43fc884e | 44 | #include "drm_internal.h" |
cc5ea594 | 45 | #include "drm_legacy.h" |
1da177e4 | 46 | |
03decbe5 DH |
47 | struct drm_vma_entry { |
48 | struct list_head head; | |
49 | struct vm_area_struct *vma; | |
50 | pid_t pid; | |
51 | }; | |
52 | ||
c94f7029 DA |
53 | static void drm_vm_open(struct vm_area_struct *vma); |
54 | static void drm_vm_close(struct vm_area_struct *vma); | |
1da177e4 | 55 | |
ff47eaf2 AL |
56 | static pgprot_t drm_io_prot(struct drm_local_map *map, |
57 | struct vm_area_struct *vma) | |
5cc7f9ab DA |
58 | { |
59 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); | |
60 | ||
6bd3110c | 61 | #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) |
f435046d AL |
62 | if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING)) |
63 | tmp = pgprot_noncached(tmp); | |
64 | else | |
65 | tmp = pgprot_writecombine(tmp); | |
6876b3ba | 66 | #elif defined(__ia64__) |
5cc7f9ab DA |
67 | if (efi_range_is_wc(vma->vm_start, vma->vm_end - |
68 | vma->vm_start)) | |
69 | tmp = pgprot_writecombine(tmp); | |
70 | else | |
71 | tmp = pgprot_noncached(tmp); | |
04cf55e1 | 72 | #elif defined(__sparc__) || defined(__arm__) || defined(__mips__) |
6876b3ba BH |
73 | tmp = pgprot_noncached(tmp); |
74 | #endif | |
75 | return tmp; | |
76 | } | |
77 | ||
78 | static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma) | |
79 | { | |
80 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); | |
81 | ||
82 | #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) | |
83 | tmp |= _PAGE_NO_CACHE; | |
5cc7f9ab DA |
84 | #endif |
85 | return tmp; | |
86 | } | |
87 | ||
1da177e4 | 88 | /** |
ca0b07d9 | 89 | * \c fault method for AGP virtual memory. |
1da177e4 LT |
90 | * |
91 | * \param vma virtual memory area. | |
92 | * \param address access address. | |
93 | * \return pointer to the page structure. | |
b5e89ed5 | 94 | * |
1da177e4 LT |
95 | * Find the right map and if it's AGP memory find the real physical page to |
96 | * map, get the page, increment the use count and return it. | |
97 | */ | |
a7fb8a23 | 98 | #if IS_ENABLED(CONFIG_AGP) |
ca0b07d9 | 99 | static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1da177e4 | 100 | { |
84b1fd10 | 101 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 102 | struct drm_device *dev = priv->minor->dev; |
f77d390c | 103 | struct drm_local_map *map = NULL; |
55910517 | 104 | struct drm_map_list *r_list; |
e0be428e | 105 | struct drm_hash_item *hash; |
1da177e4 LT |
106 | |
107 | /* | |
b5e89ed5 DA |
108 | * Find the right map |
109 | */ | |
d9906753 | 110 | if (!dev->agp) |
ca0b07d9 | 111 | goto vm_fault_error; |
1da177e4 | 112 | |
b5e89ed5 | 113 | if (!dev->agp || !dev->agp->cant_use_aperture) |
ca0b07d9 | 114 | goto vm_fault_error; |
1da177e4 | 115 | |
1545085a | 116 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) |
ca0b07d9 | 117 | goto vm_fault_error; |
8d153f71 | 118 | |
55910517 | 119 | r_list = drm_hash_entry(hash, struct drm_map_list, hash); |
8d153f71 | 120 | map = r_list->map; |
1da177e4 LT |
121 | |
122 | if (map && map->type == _DRM_AGP) { | |
ca0b07d9 NP |
123 | /* |
124 | * Using vm_pgoff as a selector forces us to use this unusual | |
125 | * addressing scheme. | |
126 | */ | |
41c2e75e BH |
127 | resource_size_t offset = (unsigned long)vmf->virtual_address - |
128 | vma->vm_start; | |
129 | resource_size_t baddr = map->offset + offset; | |
1da177e4 LT |
130 | struct drm_agp_mem *agpmem; |
131 | struct page *page; | |
132 | ||
133 | #ifdef __alpha__ | |
134 | /* | |
b5e89ed5 DA |
135 | * Adjust to a bus-relative address |
136 | */ | |
1da177e4 LT |
137 | baddr -= dev->hose->mem_space->start; |
138 | #endif | |
139 | ||
140 | /* | |
b5e89ed5 DA |
141 | * It's AGP memory - find the real physical page to map |
142 | */ | |
bd1b331f | 143 | list_for_each_entry(agpmem, &dev->agp->memory, head) { |
1da177e4 | 144 | if (agpmem->bound <= baddr && |
b5e89ed5 | 145 | agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) |
1da177e4 LT |
146 | break; |
147 | } | |
148 | ||
161c4810 | 149 | if (&agpmem->head == &dev->agp->memory) |
ca0b07d9 | 150 | goto vm_fault_error; |
1da177e4 LT |
151 | |
152 | /* | |
b5e89ed5 DA |
153 | * Get the page, inc the use count, and return it |
154 | */ | |
1da177e4 | 155 | offset = (baddr - agpmem->bound) >> PAGE_SHIFT; |
07613ba2 | 156 | page = agpmem->memory->pages[offset]; |
1da177e4 | 157 | get_page(page); |
ca0b07d9 | 158 | vmf->page = page; |
1da177e4 | 159 | |
b5e89ed5 | 160 | DRM_DEBUG |
41c2e75e BH |
161 | ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n", |
162 | (unsigned long long)baddr, | |
07613ba2 | 163 | agpmem->memory->pages[offset], |
41c2e75e | 164 | (unsigned long long)offset, |
b5e89ed5 | 165 | page_count(page)); |
ca0b07d9 | 166 | return 0; |
b5e89ed5 | 167 | } |
ca0b07d9 NP |
168 | vm_fault_error: |
169 | return VM_FAULT_SIGBUS; /* Disallow mremap */ | |
1da177e4 | 170 | } |
a7fb8a23 | 171 | #else |
ca0b07d9 | 172 | static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1da177e4 | 173 | { |
ca0b07d9 | 174 | return VM_FAULT_SIGBUS; |
1da177e4 | 175 | } |
a7fb8a23 | 176 | #endif |
1da177e4 LT |
177 | |
178 | /** | |
179 | * \c nopage method for shared virtual memory. | |
180 | * | |
181 | * \param vma virtual memory area. | |
182 | * \param address access address. | |
183 | * \return pointer to the page structure. | |
b5e89ed5 | 184 | * |
59c51591 | 185 | * Get the mapping, find the real physical page to map, get the page, and |
1da177e4 LT |
186 | * return it. |
187 | */ | |
ca0b07d9 | 188 | static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1da177e4 | 189 | { |
f77d390c | 190 | struct drm_local_map *map = vma->vm_private_data; |
b5e89ed5 DA |
191 | unsigned long offset; |
192 | unsigned long i; | |
193 | struct page *page; | |
1da177e4 | 194 | |
b5e89ed5 | 195 | if (!map) |
ca0b07d9 | 196 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
1da177e4 | 197 | |
ca0b07d9 | 198 | offset = (unsigned long)vmf->virtual_address - vma->vm_start; |
1da177e4 | 199 | i = (unsigned long)map->handle + offset; |
38315878 | 200 | page = vmalloc_to_page((void *)i); |
1da177e4 | 201 | if (!page) |
ca0b07d9 | 202 | return VM_FAULT_SIGBUS; |
1da177e4 | 203 | get_page(page); |
ca0b07d9 | 204 | vmf->page = page; |
1da177e4 | 205 | |
ca0b07d9 NP |
206 | DRM_DEBUG("shm_fault 0x%lx\n", offset); |
207 | return 0; | |
1da177e4 LT |
208 | } |
209 | ||
1da177e4 LT |
210 | /** |
211 | * \c close method for shared virtual memory. | |
b5e89ed5 | 212 | * |
1da177e4 | 213 | * \param vma virtual memory area. |
b5e89ed5 | 214 | * |
1da177e4 LT |
215 | * Deletes map information if we are the last |
216 | * person to close a mapping and it's not in the global maplist. | |
217 | */ | |
c94f7029 | 218 | static void drm_vm_shm_close(struct vm_area_struct *vma) |
1da177e4 | 219 | { |
84b1fd10 | 220 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 221 | struct drm_device *dev = priv->minor->dev; |
8fc2fdf4 | 222 | struct drm_vma_entry *pt, *temp; |
f77d390c | 223 | struct drm_local_map *map; |
55910517 | 224 | struct drm_map_list *r_list; |
1da177e4 LT |
225 | int found_maps = 0; |
226 | ||
227 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
228 | vma->vm_start, vma->vm_end - vma->vm_start); | |
1da177e4 LT |
229 | |
230 | map = vma->vm_private_data; | |
231 | ||
30e2fb18 | 232 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 233 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
b5e89ed5 DA |
234 | if (pt->vma->vm_private_data == map) |
235 | found_maps++; | |
1da177e4 | 236 | if (pt->vma == vma) { |
bd1b331f | 237 | list_del(&pt->head); |
9a298b2a | 238 | kfree(pt); |
1da177e4 LT |
239 | } |
240 | } | |
bd1b331f | 241 | |
1da177e4 | 242 | /* We were the only map that was found */ |
b5e89ed5 | 243 | if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { |
1da177e4 LT |
244 | /* Check to see if we are in the maplist, if we are not, then |
245 | * we delete this mappings information. | |
246 | */ | |
247 | found_maps = 0; | |
bd1b331f | 248 | list_for_each_entry(r_list, &dev->maplist, head) { |
b5e89ed5 DA |
249 | if (r_list->map == map) |
250 | found_maps++; | |
1da177e4 LT |
251 | } |
252 | ||
b5e89ed5 | 253 | if (!found_maps) { |
9c8da5eb DA |
254 | drm_dma_handle_t dmah; |
255 | ||
1da177e4 LT |
256 | switch (map->type) { |
257 | case _DRM_REGISTERS: | |
258 | case _DRM_FRAME_BUFFER: | |
28185647 | 259 | arch_phys_wc_del(map->mtrr); |
004a7727 | 260 | iounmap(map->handle); |
1da177e4 LT |
261 | break; |
262 | case _DRM_SHM: | |
263 | vfree(map->handle); | |
264 | break; | |
265 | case _DRM_AGP: | |
266 | case _DRM_SCATTER_GATHER: | |
267 | break; | |
2d0f9eaf | 268 | case _DRM_CONSISTENT: |
9c8da5eb DA |
269 | dmah.vaddr = map->handle; |
270 | dmah.busaddr = map->offset; | |
271 | dmah.size = map->size; | |
1c96e84e | 272 | __drm_legacy_pci_free(dev, &dmah); |
2d0f9eaf | 273 | break; |
1da177e4 | 274 | } |
9a298b2a | 275 | kfree(map); |
1da177e4 LT |
276 | } |
277 | } | |
30e2fb18 | 278 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
279 | } |
280 | ||
281 | /** | |
ca0b07d9 | 282 | * \c fault method for DMA virtual memory. |
1da177e4 LT |
283 | * |
284 | * \param vma virtual memory area. | |
285 | * \param address access address. | |
286 | * \return pointer to the page structure. | |
b5e89ed5 | 287 | * |
1da177e4 LT |
288 | * Determine the page number from the page offset and get it from drm_device_dma::pagelist. |
289 | */ | |
ca0b07d9 | 290 | static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1da177e4 | 291 | { |
84b1fd10 | 292 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 293 | struct drm_device *dev = priv->minor->dev; |
cdd55a29 | 294 | struct drm_device_dma *dma = dev->dma; |
b5e89ed5 DA |
295 | unsigned long offset; |
296 | unsigned long page_nr; | |
297 | struct page *page; | |
298 | ||
299 | if (!dma) | |
ca0b07d9 | 300 | return VM_FAULT_SIGBUS; /* Error */ |
b5e89ed5 | 301 | if (!dma->pagelist) |
ca0b07d9 | 302 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
b5e89ed5 | 303 | |
ca0b07d9 NP |
304 | offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ |
305 | page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */ | |
e1e78533 | 306 | page = virt_to_page((void *)dma->pagelist[page_nr]); |
1da177e4 LT |
307 | |
308 | get_page(page); | |
ca0b07d9 | 309 | vmf->page = page; |
1da177e4 | 310 | |
ca0b07d9 NP |
311 | DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr); |
312 | return 0; | |
1da177e4 LT |
313 | } |
314 | ||
315 | /** | |
ca0b07d9 | 316 | * \c fault method for scatter-gather virtual memory. |
1da177e4 LT |
317 | * |
318 | * \param vma virtual memory area. | |
319 | * \param address access address. | |
320 | * \return pointer to the page structure. | |
b5e89ed5 | 321 | * |
1da177e4 LT |
322 | * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. |
323 | */ | |
ca0b07d9 | 324 | static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1da177e4 | 325 | { |
f77d390c | 326 | struct drm_local_map *map = vma->vm_private_data; |
84b1fd10 | 327 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 328 | struct drm_device *dev = priv->minor->dev; |
55910517 | 329 | struct drm_sg_mem *entry = dev->sg; |
1da177e4 LT |
330 | unsigned long offset; |
331 | unsigned long map_offset; | |
332 | unsigned long page_offset; | |
333 | struct page *page; | |
334 | ||
b5e89ed5 | 335 | if (!entry) |
ca0b07d9 | 336 | return VM_FAULT_SIGBUS; /* Error */ |
b5e89ed5 | 337 | if (!entry->pagelist) |
ca0b07d9 | 338 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
1da177e4 | 339 | |
ca0b07d9 | 340 | offset = (unsigned long)vmf->virtual_address - vma->vm_start; |
d1f2b55a | 341 | map_offset = map->offset - (unsigned long)dev->sg->virtual; |
1da177e4 LT |
342 | page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
343 | page = entry->pagelist[page_offset]; | |
344 | get_page(page); | |
ca0b07d9 | 345 | vmf->page = page; |
1da177e4 | 346 | |
ca0b07d9 | 347 | return 0; |
1da177e4 LT |
348 | } |
349 | ||
ca0b07d9 | 350 | static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b5e89ed5 | 351 | { |
ca0b07d9 | 352 | return drm_do_vm_fault(vma, vmf); |
1da177e4 LT |
353 | } |
354 | ||
ca0b07d9 | 355 | static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b5e89ed5 | 356 | { |
ca0b07d9 | 357 | return drm_do_vm_shm_fault(vma, vmf); |
1da177e4 LT |
358 | } |
359 | ||
ca0b07d9 | 360 | static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b5e89ed5 | 361 | { |
ca0b07d9 | 362 | return drm_do_vm_dma_fault(vma, vmf); |
1da177e4 LT |
363 | } |
364 | ||
ca0b07d9 | 365 | static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b5e89ed5 | 366 | { |
ca0b07d9 | 367 | return drm_do_vm_sg_fault(vma, vmf); |
1da177e4 LT |
368 | } |
369 | ||
1da177e4 | 370 | /** AGP virtual memory operations */ |
f0f37e2f | 371 | static const struct vm_operations_struct drm_vm_ops = { |
ca0b07d9 | 372 | .fault = drm_vm_fault, |
b5e89ed5 DA |
373 | .open = drm_vm_open, |
374 | .close = drm_vm_close, | |
1da177e4 LT |
375 | }; |
376 | ||
377 | /** Shared virtual memory operations */ | |
f0f37e2f | 378 | static const struct vm_operations_struct drm_vm_shm_ops = { |
ca0b07d9 | 379 | .fault = drm_vm_shm_fault, |
b5e89ed5 DA |
380 | .open = drm_vm_open, |
381 | .close = drm_vm_shm_close, | |
1da177e4 LT |
382 | }; |
383 | ||
384 | /** DMA virtual memory operations */ | |
f0f37e2f | 385 | static const struct vm_operations_struct drm_vm_dma_ops = { |
ca0b07d9 | 386 | .fault = drm_vm_dma_fault, |
b5e89ed5 DA |
387 | .open = drm_vm_open, |
388 | .close = drm_vm_close, | |
1da177e4 LT |
389 | }; |
390 | ||
391 | /** Scatter-gather virtual memory operations */ | |
f0f37e2f | 392 | static const struct vm_operations_struct drm_vm_sg_ops = { |
ca0b07d9 | 393 | .fault = drm_vm_sg_fault, |
b5e89ed5 DA |
394 | .open = drm_vm_open, |
395 | .close = drm_vm_close, | |
1da177e4 LT |
396 | }; |
397 | ||
1da177e4 LT |
398 | /** |
399 | * \c open method for shared virtual memory. | |
b5e89ed5 | 400 | * |
1da177e4 | 401 | * \param vma virtual memory area. |
b5e89ed5 | 402 | * |
1da177e4 LT |
403 | * Create a new drm_vma_entry structure as the \p vma private data entry and |
404 | * add it to drm_device::vmalist. | |
405 | */ | |
b06d66be RC |
406 | void drm_vm_open_locked(struct drm_device *dev, |
407 | struct vm_area_struct *vma) | |
1da177e4 | 408 | { |
8fc2fdf4 | 409 | struct drm_vma_entry *vma_entry; |
1da177e4 LT |
410 | |
411 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
412 | vma->vm_start, vma->vm_end - vma->vm_start); | |
1da177e4 | 413 | |
9a298b2a | 414 | vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL); |
1da177e4 | 415 | if (vma_entry) { |
b5e89ed5 | 416 | vma_entry->vma = vma; |
b5e89ed5 | 417 | vma_entry->pid = current->pid; |
bd1b331f | 418 | list_add(&vma_entry->head, &dev->vmalist); |
1da177e4 LT |
419 | } |
420 | } | |
421 | ||
d7d8aac7 TH |
422 | static void drm_vm_open(struct vm_area_struct *vma) |
423 | { | |
84b1fd10 | 424 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 425 | struct drm_device *dev = priv->minor->dev; |
d7d8aac7 TH |
426 | |
427 | mutex_lock(&dev->struct_mutex); | |
b06d66be | 428 | drm_vm_open_locked(dev, vma); |
d7d8aac7 TH |
429 | mutex_unlock(&dev->struct_mutex); |
430 | } | |
431 | ||
b06d66be RC |
432 | void drm_vm_close_locked(struct drm_device *dev, |
433 | struct vm_area_struct *vma) | |
1da177e4 | 434 | { |
8fc2fdf4 | 435 | struct drm_vma_entry *pt, *temp; |
1da177e4 LT |
436 | |
437 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
438 | vma->vm_start, vma->vm_end - vma->vm_start); | |
1da177e4 | 439 | |
bd1b331f | 440 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
1da177e4 | 441 | if (pt->vma == vma) { |
bd1b331f | 442 | list_del(&pt->head); |
9a298b2a | 443 | kfree(pt); |
1da177e4 LT |
444 | break; |
445 | } | |
446 | } | |
31dfbc93 CW |
447 | } |
448 | ||
449 | /** | |
450 | * \c close method for all virtual memory types. | |
451 | * | |
452 | * \param vma virtual memory area. | |
453 | * | |
454 | * Search the \p vma private data entry in drm_device::vmalist, unlink it, and | |
455 | * free it. | |
456 | */ | |
457 | static void drm_vm_close(struct vm_area_struct *vma) | |
458 | { | |
459 | struct drm_file *priv = vma->vm_file->private_data; | |
460 | struct drm_device *dev = priv->minor->dev; | |
461 | ||
462 | mutex_lock(&dev->struct_mutex); | |
b06d66be | 463 | drm_vm_close_locked(dev, vma); |
30e2fb18 | 464 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
465 | } |
466 | ||
467 | /** | |
468 | * mmap DMA memory. | |
469 | * | |
6c340eac | 470 | * \param file_priv DRM file private. |
1da177e4 LT |
471 | * \param vma virtual memory area. |
472 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 473 | * |
1da177e4 LT |
474 | * Sets the virtual memory area operations structure to vm_dma_ops, the file |
475 | * pointer, and calls vm_open(). | |
476 | */ | |
c94f7029 | 477 | static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 478 | { |
84b1fd10 DA |
479 | struct drm_file *priv = filp->private_data; |
480 | struct drm_device *dev; | |
cdd55a29 | 481 | struct drm_device_dma *dma; |
b5e89ed5 | 482 | unsigned long length = vma->vm_end - vma->vm_start; |
1da177e4 | 483 | |
2c14f28b | 484 | dev = priv->minor->dev; |
b5e89ed5 | 485 | dma = dev->dma; |
1545085a TH |
486 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
487 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 488 | |
b5e89ed5 | 489 | /* Length must match exact page count */ |
1da177e4 | 490 | if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
1da177e4 LT |
491 | return -EINVAL; |
492 | } | |
1da177e4 | 493 | |
3417f33e GS |
494 | if (!capable(CAP_SYS_ADMIN) && |
495 | (dma->flags & _DRM_DMA_USE_PCI_RO)) { | |
496 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
497 | #if defined(__i386__) || defined(__x86_64__) | |
498 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
499 | #else | |
500 | /* Ye gads this is ugly. With more thought | |
501 | we could move this up higher and use | |
502 | `protection_map' instead. */ | |
503 | vma->vm_page_prot = | |
504 | __pgprot(pte_val | |
505 | (pte_wrprotect | |
506 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
507 | #endif | |
508 | } | |
509 | ||
b5e89ed5 | 510 | vma->vm_ops = &drm_vm_dma_ops; |
1da177e4 | 511 | |
314e51b9 | 512 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
1da177e4 | 513 | |
b06d66be | 514 | drm_vm_open_locked(dev, vma); |
1da177e4 LT |
515 | return 0; |
516 | } | |
517 | ||
cbc60ca0 | 518 | static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev) |
1da177e4 LT |
519 | { |
520 | #ifdef __alpha__ | |
82ba3fef | 521 | return dev->hose->dense_mem_base; |
1da177e4 LT |
522 | #else |
523 | return 0; | |
524 | #endif | |
525 | } | |
b5e89ed5 | 526 | |
1da177e4 LT |
527 | /** |
528 | * mmap DMA memory. | |
529 | * | |
6c340eac | 530 | * \param file_priv DRM file private. |
1da177e4 LT |
531 | * \param vma virtual memory area. |
532 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 533 | * |
1da177e4 LT |
534 | * If the virtual memory area has no offset associated with it then it's a DMA |
535 | * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, | |
536 | * checks that the restricted flag is not set, sets the virtual memory operations | |
537 | * according to the mapping type and remaps the pages. Finally sets the file | |
538 | * pointer and calls vm_open(). | |
539 | */ | |
bfbf3c85 | 540 | static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 541 | { |
84b1fd10 | 542 | struct drm_file *priv = filp->private_data; |
2c14f28b | 543 | struct drm_device *dev = priv->minor->dev; |
f77d390c | 544 | struct drm_local_map *map = NULL; |
41c2e75e | 545 | resource_size_t offset = 0; |
e0be428e | 546 | struct drm_hash_item *hash; |
1da177e4 | 547 | |
1545085a TH |
548 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
549 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 550 | |
b5e89ed5 DA |
551 | if (!priv->authenticated) |
552 | return -EACCES; | |
1da177e4 LT |
553 | |
554 | /* We check for "dma". On Apple's UniNorth, it's valid to have | |
555 | * the AGP mapped at physical address 0 | |
556 | * --BenH. | |
557 | */ | |
1545085a | 558 | if (!vma->vm_pgoff |
a7fb8a23 | 559 | #if IS_ENABLED(CONFIG_AGP) |
b5e89ed5 DA |
560 | && (!dev->agp |
561 | || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) | |
1da177e4 LT |
562 | #endif |
563 | ) | |
564 | return drm_mmap_dma(filp, vma); | |
565 | ||
1545085a | 566 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { |
8d153f71 TH |
567 | DRM_ERROR("Could not find map\n"); |
568 | return -EINVAL; | |
1da177e4 LT |
569 | } |
570 | ||
55910517 | 571 | map = drm_hash_entry(hash, struct drm_map_list, hash)->map; |
b5e89ed5 | 572 | if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) |
1da177e4 LT |
573 | return -EPERM; |
574 | ||
b5e89ed5 | 575 | /* Check for valid size. */ |
54ba2f76 | 576 | if (map->size < vma->vm_end - vma->vm_start) |
b5e89ed5 | 577 | return -EINVAL; |
1da177e4 LT |
578 | |
579 | if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { | |
580 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
581 | #if defined(__i386__) || defined(__x86_64__) | |
582 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
583 | #else | |
b5e89ed5 DA |
584 | /* Ye gads this is ugly. With more thought |
585 | we could move this up higher and use | |
586 | `protection_map' instead. */ | |
587 | vma->vm_page_prot = | |
588 | __pgprot(pte_val | |
589 | (pte_wrprotect | |
590 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
1da177e4 LT |
591 | #endif |
592 | } | |
593 | ||
594 | switch (map->type) { | |
4b7fb9b5 | 595 | #if !defined(__arm__) |
b5e89ed5 | 596 | case _DRM_AGP: |
d9906753 | 597 | if (dev->agp && dev->agp->cant_use_aperture) { |
b5e89ed5 DA |
598 | /* |
599 | * On some platforms we can't talk to bus dma address from the CPU, so for | |
600 | * memory of type DRM_AGP, we'll deal with sorting out the real physical | |
ca0b07d9 | 601 | * pages and mappings in fault() |
b5e89ed5 | 602 | */ |
1da177e4 | 603 | #if defined(__powerpc__) |
b5e89ed5 | 604 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; |
1da177e4 | 605 | #endif |
b5e89ed5 DA |
606 | vma->vm_ops = &drm_vm_ops; |
607 | break; | |
608 | } | |
609 | /* fall through to _DRM_FRAME_BUFFER... */ | |
4b7fb9b5 | 610 | #endif |
1da177e4 LT |
611 | case _DRM_FRAME_BUFFER: |
612 | case _DRM_REGISTERS: | |
cbc60ca0 | 613 | offset = drm_core_get_reg_ofs(dev); |
ff47eaf2 | 614 | vma->vm_page_prot = drm_io_prot(map, vma); |
3d77461e | 615 | if (io_remap_pfn_range(vma, vma->vm_start, |
b5e89ed5 DA |
616 | (map->offset + offset) >> PAGE_SHIFT, |
617 | vma->vm_end - vma->vm_start, | |
618 | vma->vm_page_prot)) | |
b5e89ed5 | 619 | return -EAGAIN; |
1da177e4 | 620 | DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," |
41c2e75e | 621 | " offset = 0x%llx\n", |
1da177e4 | 622 | map->type, |
41c2e75e | 623 | vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset)); |
4b7fb9b5 | 624 | |
1da177e4 LT |
625 | vma->vm_ops = &drm_vm_ops; |
626 | break; | |
2d0f9eaf | 627 | case _DRM_CONSISTENT: |
38315878 | 628 | /* Consistent memory is really like shared memory. But |
ca0b07d9 | 629 | * it's allocated in a different way, so avoid fault */ |
38315878 HD |
630 | if (remap_pfn_range(vma, vma->vm_start, |
631 | page_to_pfn(virt_to_page(map->handle)), | |
632 | vma->vm_end - vma->vm_start, vma->vm_page_prot)) | |
633 | return -EAGAIN; | |
6876b3ba | 634 | vma->vm_page_prot = drm_dma_prot(map->type, vma); |
38315878 HD |
635 | /* fall through to _DRM_SHM */ |
636 | case _DRM_SHM: | |
1da177e4 LT |
637 | vma->vm_ops = &drm_vm_shm_ops; |
638 | vma->vm_private_data = (void *)map; | |
1da177e4 LT |
639 | break; |
640 | case _DRM_SCATTER_GATHER: | |
641 | vma->vm_ops = &drm_vm_sg_ops; | |
642 | vma->vm_private_data = (void *)map; | |
5ff64611 | 643 | vma->vm_page_prot = drm_dma_prot(map->type, vma); |
b5e89ed5 | 644 | break; |
1da177e4 LT |
645 | default: |
646 | return -EINVAL; /* This should never happen. */ | |
647 | } | |
314e51b9 | 648 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
1da177e4 | 649 | |
b06d66be | 650 | drm_vm_open_locked(dev, vma); |
1da177e4 LT |
651 | return 0; |
652 | } | |
b5e89ed5 | 653 | |
bfbf3c85 | 654 | int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma) |
d7d8aac7 | 655 | { |
84b1fd10 | 656 | struct drm_file *priv = filp->private_data; |
2c14f28b | 657 | struct drm_device *dev = priv->minor->dev; |
d7d8aac7 TH |
658 | int ret; |
659 | ||
2c07a21d DA |
660 | if (drm_device_is_unplugged(dev)) |
661 | return -ENODEV; | |
662 | ||
d7d8aac7 TH |
663 | mutex_lock(&dev->struct_mutex); |
664 | ret = drm_mmap_locked(filp, vma); | |
665 | mutex_unlock(&dev->struct_mutex); | |
666 | ||
667 | return ret; | |
668 | } | |
bfbf3c85 | 669 | EXPORT_SYMBOL(drm_legacy_mmap); |
03decbe5 DH |
670 | |
671 | void drm_legacy_vma_flush(struct drm_device *dev) | |
672 | { | |
673 | struct drm_vma_entry *vma, *vma_temp; | |
674 | ||
675 | /* Clear vma list (only needed for legacy drivers) */ | |
676 | list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { | |
677 | list_del(&vma->head); | |
678 | kfree(vma); | |
679 | } | |
680 | } | |
681 | ||
03decbe5 DH |
682 | int drm_vma_info(struct seq_file *m, void *data) |
683 | { | |
684 | struct drm_info_node *node = (struct drm_info_node *) m->private; | |
685 | struct drm_device *dev = node->minor->dev; | |
686 | struct drm_vma_entry *pt; | |
687 | struct vm_area_struct *vma; | |
688 | unsigned long vma_count = 0; | |
689 | #if defined(__i386__) | |
690 | unsigned int pgprot; | |
691 | #endif | |
692 | ||
693 | mutex_lock(&dev->struct_mutex); | |
694 | list_for_each_entry(pt, &dev->vmalist, head) | |
695 | vma_count++; | |
696 | ||
697 | seq_printf(m, "vma use count: %lu, high_memory = %pK, 0x%pK\n", | |
698 | vma_count, high_memory, | |
699 | (void *)(unsigned long)virt_to_phys(high_memory)); | |
700 | ||
701 | list_for_each_entry(pt, &dev->vmalist, head) { | |
702 | vma = pt->vma; | |
703 | if (!vma) | |
704 | continue; | |
705 | seq_printf(m, | |
706 | "\n%5d 0x%pK-0x%pK %c%c%c%c%c%c 0x%08lx000", | |
707 | pt->pid, | |
708 | (void *)vma->vm_start, (void *)vma->vm_end, | |
709 | vma->vm_flags & VM_READ ? 'r' : '-', | |
710 | vma->vm_flags & VM_WRITE ? 'w' : '-', | |
711 | vma->vm_flags & VM_EXEC ? 'x' : '-', | |
712 | vma->vm_flags & VM_MAYSHARE ? 's' : 'p', | |
713 | vma->vm_flags & VM_LOCKED ? 'l' : '-', | |
714 | vma->vm_flags & VM_IO ? 'i' : '-', | |
715 | vma->vm_pgoff); | |
716 | ||
717 | #if defined(__i386__) | |
718 | pgprot = pgprot_val(vma->vm_page_prot); | |
719 | seq_printf(m, " %c%c%c%c%c%c%c%c%c", | |
720 | pgprot & _PAGE_PRESENT ? 'p' : '-', | |
721 | pgprot & _PAGE_RW ? 'w' : 'r', | |
722 | pgprot & _PAGE_USER ? 'u' : 's', | |
723 | pgprot & _PAGE_PWT ? 't' : 'b', | |
724 | pgprot & _PAGE_PCD ? 'u' : 'c', | |
725 | pgprot & _PAGE_ACCESSED ? 'a' : '-', | |
726 | pgprot & _PAGE_DIRTY ? 'd' : '-', | |
727 | pgprot & _PAGE_PSE ? 'm' : 'k', | |
728 | pgprot & _PAGE_GLOBAL ? 'g' : 'l'); | |
729 | #endif | |
730 | seq_printf(m, "\n"); | |
731 | } | |
732 | mutex_unlock(&dev->struct_mutex); | |
733 | return 0; | |
734 | } |