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Commit | Line | Data |
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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 |
95cf9264 | 43 | #include <linux/mem_encrypt.h> |
2791ee85 | 44 | #include <asm/pgtable.h> |
43fc884e | 45 | #include "drm_internal.h" |
cc5ea594 | 46 | #include "drm_legacy.h" |
1da177e4 | 47 | |
03decbe5 DH |
48 | struct drm_vma_entry { |
49 | struct list_head head; | |
50 | struct vm_area_struct *vma; | |
51 | pid_t pid; | |
52 | }; | |
53 | ||
c94f7029 DA |
54 | static void drm_vm_open(struct vm_area_struct *vma); |
55 | static void drm_vm_close(struct vm_area_struct *vma); | |
1da177e4 | 56 | |
ff47eaf2 AL |
57 | static pgprot_t drm_io_prot(struct drm_local_map *map, |
58 | struct vm_area_struct *vma) | |
5cc7f9ab DA |
59 | { |
60 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); | |
61 | ||
95cf9264 TL |
62 | /* We don't want graphics memory to be mapped encrypted */ |
63 | tmp = pgprot_decrypted(tmp); | |
64 | ||
6bd3110c | 65 | #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) |
f435046d AL |
66 | if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING)) |
67 | tmp = pgprot_noncached(tmp); | |
68 | else | |
69 | tmp = pgprot_writecombine(tmp); | |
6876b3ba | 70 | #elif defined(__ia64__) |
5cc7f9ab DA |
71 | if (efi_range_is_wc(vma->vm_start, vma->vm_end - |
72 | vma->vm_start)) | |
73 | tmp = pgprot_writecombine(tmp); | |
74 | else | |
75 | tmp = pgprot_noncached(tmp); | |
04cf55e1 | 76 | #elif defined(__sparc__) || defined(__arm__) || defined(__mips__) |
6876b3ba BH |
77 | tmp = pgprot_noncached(tmp); |
78 | #endif | |
79 | return tmp; | |
80 | } | |
81 | ||
82 | static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma) | |
83 | { | |
84 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); | |
85 | ||
86 | #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) | |
37035e74 | 87 | tmp = pgprot_noncached_wc(tmp); |
5cc7f9ab DA |
88 | #endif |
89 | return tmp; | |
90 | } | |
91 | ||
1da177e4 | 92 | /** |
ca0b07d9 | 93 | * \c fault method for AGP virtual memory. |
1da177e4 LT |
94 | * |
95 | * \param vma virtual memory area. | |
96 | * \param address access address. | |
97 | * \return pointer to the page structure. | |
b5e89ed5 | 98 | * |
1da177e4 LT |
99 | * Find the right map and if it's AGP memory find the real physical page to |
100 | * map, get the page, increment the use count and return it. | |
101 | */ | |
a7fb8a23 | 102 | #if IS_ENABLED(CONFIG_AGP) |
8f526e12 | 103 | static int drm_vm_fault(struct vm_fault *vmf) |
1da177e4 | 104 | { |
11bac800 | 105 | struct vm_area_struct *vma = vmf->vma; |
84b1fd10 | 106 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 107 | struct drm_device *dev = priv->minor->dev; |
f77d390c | 108 | struct drm_local_map *map = NULL; |
55910517 | 109 | struct drm_map_list *r_list; |
e0be428e | 110 | struct drm_hash_item *hash; |
1da177e4 LT |
111 | |
112 | /* | |
b5e89ed5 DA |
113 | * Find the right map |
114 | */ | |
d9906753 | 115 | if (!dev->agp) |
ca0b07d9 | 116 | goto vm_fault_error; |
1da177e4 | 117 | |
b5e89ed5 | 118 | if (!dev->agp || !dev->agp->cant_use_aperture) |
ca0b07d9 | 119 | goto vm_fault_error; |
1da177e4 | 120 | |
1545085a | 121 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) |
ca0b07d9 | 122 | goto vm_fault_error; |
8d153f71 | 123 | |
55910517 | 124 | r_list = drm_hash_entry(hash, struct drm_map_list, hash); |
8d153f71 | 125 | map = r_list->map; |
1da177e4 LT |
126 | |
127 | if (map && map->type == _DRM_AGP) { | |
ca0b07d9 NP |
128 | /* |
129 | * Using vm_pgoff as a selector forces us to use this unusual | |
130 | * addressing scheme. | |
131 | */ | |
1a29d85e | 132 | resource_size_t offset = vmf->address - vma->vm_start; |
41c2e75e | 133 | resource_size_t baddr = map->offset + offset; |
1da177e4 LT |
134 | struct drm_agp_mem *agpmem; |
135 | struct page *page; | |
136 | ||
137 | #ifdef __alpha__ | |
138 | /* | |
b5e89ed5 DA |
139 | * Adjust to a bus-relative address |
140 | */ | |
1da177e4 LT |
141 | baddr -= dev->hose->mem_space->start; |
142 | #endif | |
143 | ||
144 | /* | |
b5e89ed5 DA |
145 | * It's AGP memory - find the real physical page to map |
146 | */ | |
bd1b331f | 147 | list_for_each_entry(agpmem, &dev->agp->memory, head) { |
1da177e4 | 148 | if (agpmem->bound <= baddr && |
b5e89ed5 | 149 | agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) |
1da177e4 LT |
150 | break; |
151 | } | |
152 | ||
161c4810 | 153 | if (&agpmem->head == &dev->agp->memory) |
ca0b07d9 | 154 | goto vm_fault_error; |
1da177e4 LT |
155 | |
156 | /* | |
b5e89ed5 DA |
157 | * Get the page, inc the use count, and return it |
158 | */ | |
1da177e4 | 159 | offset = (baddr - agpmem->bound) >> PAGE_SHIFT; |
07613ba2 | 160 | page = agpmem->memory->pages[offset]; |
1da177e4 | 161 | get_page(page); |
ca0b07d9 | 162 | vmf->page = page; |
1da177e4 | 163 | |
b5e89ed5 | 164 | DRM_DEBUG |
41c2e75e BH |
165 | ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n", |
166 | (unsigned long long)baddr, | |
07613ba2 | 167 | agpmem->memory->pages[offset], |
41c2e75e | 168 | (unsigned long long)offset, |
b5e89ed5 | 169 | page_count(page)); |
ca0b07d9 | 170 | return 0; |
b5e89ed5 | 171 | } |
ca0b07d9 NP |
172 | vm_fault_error: |
173 | return VM_FAULT_SIGBUS; /* Disallow mremap */ | |
1da177e4 | 174 | } |
a7fb8a23 | 175 | #else |
8f526e12 | 176 | static int drm_vm_fault(struct vm_fault *vmf) |
1da177e4 | 177 | { |
ca0b07d9 | 178 | return VM_FAULT_SIGBUS; |
1da177e4 | 179 | } |
a7fb8a23 | 180 | #endif |
1da177e4 LT |
181 | |
182 | /** | |
183 | * \c nopage method for shared virtual memory. | |
184 | * | |
185 | * \param vma virtual memory area. | |
186 | * \param address access address. | |
187 | * \return pointer to the page structure. | |
b5e89ed5 | 188 | * |
59c51591 | 189 | * Get the mapping, find the real physical page to map, get the page, and |
1da177e4 LT |
190 | * return it. |
191 | */ | |
8f526e12 | 192 | static int drm_vm_shm_fault(struct vm_fault *vmf) |
1da177e4 | 193 | { |
11bac800 | 194 | struct vm_area_struct *vma = vmf->vma; |
f77d390c | 195 | struct drm_local_map *map = vma->vm_private_data; |
b5e89ed5 DA |
196 | unsigned long offset; |
197 | unsigned long i; | |
198 | struct page *page; | |
1da177e4 | 199 | |
b5e89ed5 | 200 | if (!map) |
ca0b07d9 | 201 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
1da177e4 | 202 | |
1a29d85e | 203 | offset = vmf->address - vma->vm_start; |
1da177e4 | 204 | i = (unsigned long)map->handle + offset; |
38315878 | 205 | page = vmalloc_to_page((void *)i); |
1da177e4 | 206 | if (!page) |
ca0b07d9 | 207 | return VM_FAULT_SIGBUS; |
1da177e4 | 208 | get_page(page); |
ca0b07d9 | 209 | vmf->page = page; |
1da177e4 | 210 | |
ca0b07d9 NP |
211 | DRM_DEBUG("shm_fault 0x%lx\n", offset); |
212 | return 0; | |
1da177e4 LT |
213 | } |
214 | ||
1da177e4 LT |
215 | /** |
216 | * \c close method for shared virtual memory. | |
b5e89ed5 | 217 | * |
1da177e4 | 218 | * \param vma virtual memory area. |
b5e89ed5 | 219 | * |
1da177e4 LT |
220 | * Deletes map information if we are the last |
221 | * person to close a mapping and it's not in the global maplist. | |
222 | */ | |
c94f7029 | 223 | static void drm_vm_shm_close(struct vm_area_struct *vma) |
1da177e4 | 224 | { |
84b1fd10 | 225 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 226 | struct drm_device *dev = priv->minor->dev; |
8fc2fdf4 | 227 | struct drm_vma_entry *pt, *temp; |
f77d390c | 228 | struct drm_local_map *map; |
55910517 | 229 | struct drm_map_list *r_list; |
1da177e4 LT |
230 | int found_maps = 0; |
231 | ||
232 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
233 | vma->vm_start, vma->vm_end - vma->vm_start); | |
1da177e4 LT |
234 | |
235 | map = vma->vm_private_data; | |
236 | ||
30e2fb18 | 237 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 238 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
b5e89ed5 DA |
239 | if (pt->vma->vm_private_data == map) |
240 | found_maps++; | |
1da177e4 | 241 | if (pt->vma == vma) { |
bd1b331f | 242 | list_del(&pt->head); |
9a298b2a | 243 | kfree(pt); |
1da177e4 LT |
244 | } |
245 | } | |
bd1b331f | 246 | |
1da177e4 | 247 | /* We were the only map that was found */ |
b5e89ed5 | 248 | if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { |
1da177e4 LT |
249 | /* Check to see if we are in the maplist, if we are not, then |
250 | * we delete this mappings information. | |
251 | */ | |
252 | found_maps = 0; | |
bd1b331f | 253 | list_for_each_entry(r_list, &dev->maplist, head) { |
b5e89ed5 DA |
254 | if (r_list->map == map) |
255 | found_maps++; | |
1da177e4 LT |
256 | } |
257 | ||
b5e89ed5 | 258 | if (!found_maps) { |
9c8da5eb DA |
259 | drm_dma_handle_t dmah; |
260 | ||
1da177e4 LT |
261 | switch (map->type) { |
262 | case _DRM_REGISTERS: | |
263 | case _DRM_FRAME_BUFFER: | |
28185647 | 264 | arch_phys_wc_del(map->mtrr); |
004a7727 | 265 | iounmap(map->handle); |
1da177e4 LT |
266 | break; |
267 | case _DRM_SHM: | |
268 | vfree(map->handle); | |
269 | break; | |
270 | case _DRM_AGP: | |
271 | case _DRM_SCATTER_GATHER: | |
272 | break; | |
2d0f9eaf | 273 | case _DRM_CONSISTENT: |
9c8da5eb DA |
274 | dmah.vaddr = map->handle; |
275 | dmah.busaddr = map->offset; | |
276 | dmah.size = map->size; | |
1c96e84e | 277 | __drm_legacy_pci_free(dev, &dmah); |
2d0f9eaf | 278 | break; |
1da177e4 | 279 | } |
9a298b2a | 280 | kfree(map); |
1da177e4 LT |
281 | } |
282 | } | |
30e2fb18 | 283 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
284 | } |
285 | ||
286 | /** | |
ca0b07d9 | 287 | * \c fault method for DMA virtual memory. |
1da177e4 | 288 | * |
1da177e4 LT |
289 | * \param address access address. |
290 | * \return pointer to the page structure. | |
b5e89ed5 | 291 | * |
1da177e4 LT |
292 | * Determine the page number from the page offset and get it from drm_device_dma::pagelist. |
293 | */ | |
8f526e12 | 294 | static int drm_vm_dma_fault(struct vm_fault *vmf) |
1da177e4 | 295 | { |
11bac800 | 296 | struct vm_area_struct *vma = vmf->vma; |
84b1fd10 | 297 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 298 | struct drm_device *dev = priv->minor->dev; |
cdd55a29 | 299 | struct drm_device_dma *dma = dev->dma; |
b5e89ed5 DA |
300 | unsigned long offset; |
301 | unsigned long page_nr; | |
302 | struct page *page; | |
303 | ||
304 | if (!dma) | |
ca0b07d9 | 305 | return VM_FAULT_SIGBUS; /* Error */ |
b5e89ed5 | 306 | if (!dma->pagelist) |
ca0b07d9 | 307 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
b5e89ed5 | 308 | |
1a29d85e JK |
309 | offset = vmf->address - vma->vm_start; |
310 | /* vm_[pg]off[set] should be 0 */ | |
ca0b07d9 | 311 | page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */ |
e1e78533 | 312 | page = virt_to_page((void *)dma->pagelist[page_nr]); |
1da177e4 LT |
313 | |
314 | get_page(page); | |
ca0b07d9 | 315 | vmf->page = page; |
1da177e4 | 316 | |
ca0b07d9 NP |
317 | DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr); |
318 | return 0; | |
1da177e4 LT |
319 | } |
320 | ||
321 | /** | |
ca0b07d9 | 322 | * \c fault method for scatter-gather virtual memory. |
1da177e4 | 323 | * |
1da177e4 LT |
324 | * \param address access address. |
325 | * \return pointer to the page structure. | |
b5e89ed5 | 326 | * |
1da177e4 LT |
327 | * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. |
328 | */ | |
8f526e12 | 329 | static int drm_vm_sg_fault(struct vm_fault *vmf) |
1da177e4 | 330 | { |
11bac800 | 331 | struct vm_area_struct *vma = vmf->vma; |
f77d390c | 332 | struct drm_local_map *map = vma->vm_private_data; |
84b1fd10 | 333 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 334 | struct drm_device *dev = priv->minor->dev; |
55910517 | 335 | struct drm_sg_mem *entry = dev->sg; |
1da177e4 LT |
336 | unsigned long offset; |
337 | unsigned long map_offset; | |
338 | unsigned long page_offset; | |
339 | struct page *page; | |
340 | ||
b5e89ed5 | 341 | if (!entry) |
ca0b07d9 | 342 | return VM_FAULT_SIGBUS; /* Error */ |
b5e89ed5 | 343 | if (!entry->pagelist) |
ca0b07d9 | 344 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
1da177e4 | 345 | |
1a29d85e | 346 | offset = vmf->address - vma->vm_start; |
d1f2b55a | 347 | map_offset = map->offset - (unsigned long)dev->sg->virtual; |
1da177e4 LT |
348 | page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
349 | page = entry->pagelist[page_offset]; | |
350 | get_page(page); | |
ca0b07d9 | 351 | vmf->page = page; |
1da177e4 | 352 | |
ca0b07d9 | 353 | return 0; |
1da177e4 LT |
354 | } |
355 | ||
1da177e4 | 356 | /** AGP virtual memory operations */ |
f0f37e2f | 357 | static const struct vm_operations_struct drm_vm_ops = { |
ca0b07d9 | 358 | .fault = drm_vm_fault, |
b5e89ed5 DA |
359 | .open = drm_vm_open, |
360 | .close = drm_vm_close, | |
1da177e4 LT |
361 | }; |
362 | ||
363 | /** Shared virtual memory operations */ | |
f0f37e2f | 364 | static const struct vm_operations_struct drm_vm_shm_ops = { |
ca0b07d9 | 365 | .fault = drm_vm_shm_fault, |
b5e89ed5 DA |
366 | .open = drm_vm_open, |
367 | .close = drm_vm_shm_close, | |
1da177e4 LT |
368 | }; |
369 | ||
370 | /** DMA virtual memory operations */ | |
f0f37e2f | 371 | static const struct vm_operations_struct drm_vm_dma_ops = { |
ca0b07d9 | 372 | .fault = drm_vm_dma_fault, |
b5e89ed5 DA |
373 | .open = drm_vm_open, |
374 | .close = drm_vm_close, | |
1da177e4 LT |
375 | }; |
376 | ||
377 | /** Scatter-gather virtual memory operations */ | |
f0f37e2f | 378 | static const struct vm_operations_struct drm_vm_sg_ops = { |
ca0b07d9 | 379 | .fault = drm_vm_sg_fault, |
b5e89ed5 DA |
380 | .open = drm_vm_open, |
381 | .close = drm_vm_close, | |
1da177e4 LT |
382 | }; |
383 | ||
f47dbdd7 DV |
384 | static void drm_vm_open_locked(struct drm_device *dev, |
385 | struct vm_area_struct *vma) | |
1da177e4 | 386 | { |
8fc2fdf4 | 387 | struct drm_vma_entry *vma_entry; |
1da177e4 LT |
388 | |
389 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
390 | vma->vm_start, vma->vm_end - vma->vm_start); | |
1da177e4 | 391 | |
9a298b2a | 392 | vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL); |
1da177e4 | 393 | if (vma_entry) { |
b5e89ed5 | 394 | vma_entry->vma = vma; |
b5e89ed5 | 395 | vma_entry->pid = current->pid; |
bd1b331f | 396 | list_add(&vma_entry->head, &dev->vmalist); |
1da177e4 LT |
397 | } |
398 | } | |
399 | ||
d7d8aac7 TH |
400 | static void drm_vm_open(struct vm_area_struct *vma) |
401 | { | |
84b1fd10 | 402 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 403 | struct drm_device *dev = priv->minor->dev; |
d7d8aac7 TH |
404 | |
405 | mutex_lock(&dev->struct_mutex); | |
b06d66be | 406 | drm_vm_open_locked(dev, vma); |
d7d8aac7 TH |
407 | mutex_unlock(&dev->struct_mutex); |
408 | } | |
409 | ||
f47dbdd7 DV |
410 | static void drm_vm_close_locked(struct drm_device *dev, |
411 | struct vm_area_struct *vma) | |
1da177e4 | 412 | { |
8fc2fdf4 | 413 | struct drm_vma_entry *pt, *temp; |
1da177e4 LT |
414 | |
415 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
416 | vma->vm_start, vma->vm_end - vma->vm_start); | |
1da177e4 | 417 | |
bd1b331f | 418 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
1da177e4 | 419 | if (pt->vma == vma) { |
bd1b331f | 420 | list_del(&pt->head); |
9a298b2a | 421 | kfree(pt); |
1da177e4 LT |
422 | break; |
423 | } | |
424 | } | |
31dfbc93 CW |
425 | } |
426 | ||
427 | /** | |
428 | * \c close method for all virtual memory types. | |
429 | * | |
430 | * \param vma virtual memory area. | |
431 | * | |
432 | * Search the \p vma private data entry in drm_device::vmalist, unlink it, and | |
433 | * free it. | |
434 | */ | |
435 | static void drm_vm_close(struct vm_area_struct *vma) | |
436 | { | |
437 | struct drm_file *priv = vma->vm_file->private_data; | |
438 | struct drm_device *dev = priv->minor->dev; | |
439 | ||
440 | mutex_lock(&dev->struct_mutex); | |
b06d66be | 441 | drm_vm_close_locked(dev, vma); |
30e2fb18 | 442 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
443 | } |
444 | ||
445 | /** | |
446 | * mmap DMA memory. | |
447 | * | |
6c340eac | 448 | * \param file_priv DRM file private. |
1da177e4 LT |
449 | * \param vma virtual memory area. |
450 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 451 | * |
1da177e4 LT |
452 | * Sets the virtual memory area operations structure to vm_dma_ops, the file |
453 | * pointer, and calls vm_open(). | |
454 | */ | |
c94f7029 | 455 | static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 456 | { |
84b1fd10 DA |
457 | struct drm_file *priv = filp->private_data; |
458 | struct drm_device *dev; | |
cdd55a29 | 459 | struct drm_device_dma *dma; |
b5e89ed5 | 460 | unsigned long length = vma->vm_end - vma->vm_start; |
1da177e4 | 461 | |
2c14f28b | 462 | dev = priv->minor->dev; |
b5e89ed5 | 463 | dma = dev->dma; |
1545085a TH |
464 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
465 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 466 | |
b5e89ed5 | 467 | /* Length must match exact page count */ |
1da177e4 | 468 | if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
1da177e4 LT |
469 | return -EINVAL; |
470 | } | |
1da177e4 | 471 | |
3417f33e GS |
472 | if (!capable(CAP_SYS_ADMIN) && |
473 | (dma->flags & _DRM_DMA_USE_PCI_RO)) { | |
474 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
475 | #if defined(__i386__) || defined(__x86_64__) | |
476 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
477 | #else | |
478 | /* Ye gads this is ugly. With more thought | |
479 | we could move this up higher and use | |
480 | `protection_map' instead. */ | |
481 | vma->vm_page_prot = | |
482 | __pgprot(pte_val | |
483 | (pte_wrprotect | |
484 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
485 | #endif | |
486 | } | |
487 | ||
b5e89ed5 | 488 | vma->vm_ops = &drm_vm_dma_ops; |
1da177e4 | 489 | |
314e51b9 | 490 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
1da177e4 | 491 | |
b06d66be | 492 | drm_vm_open_locked(dev, vma); |
1da177e4 LT |
493 | return 0; |
494 | } | |
495 | ||
cbc60ca0 | 496 | static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev) |
1da177e4 LT |
497 | { |
498 | #ifdef __alpha__ | |
82ba3fef | 499 | return dev->hose->dense_mem_base; |
1da177e4 LT |
500 | #else |
501 | return 0; | |
502 | #endif | |
503 | } | |
b5e89ed5 | 504 | |
1da177e4 LT |
505 | /** |
506 | * mmap DMA memory. | |
507 | * | |
6c340eac | 508 | * \param file_priv DRM file private. |
1da177e4 LT |
509 | * \param vma virtual memory area. |
510 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 511 | * |
1da177e4 LT |
512 | * If the virtual memory area has no offset associated with it then it's a DMA |
513 | * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, | |
514 | * checks that the restricted flag is not set, sets the virtual memory operations | |
515 | * according to the mapping type and remaps the pages. Finally sets the file | |
516 | * pointer and calls vm_open(). | |
517 | */ | |
bfbf3c85 | 518 | static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 519 | { |
84b1fd10 | 520 | struct drm_file *priv = filp->private_data; |
2c14f28b | 521 | struct drm_device *dev = priv->minor->dev; |
f77d390c | 522 | struct drm_local_map *map = NULL; |
41c2e75e | 523 | resource_size_t offset = 0; |
e0be428e | 524 | struct drm_hash_item *hash; |
1da177e4 | 525 | |
1545085a TH |
526 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
527 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 528 | |
b5e89ed5 DA |
529 | if (!priv->authenticated) |
530 | return -EACCES; | |
1da177e4 LT |
531 | |
532 | /* We check for "dma". On Apple's UniNorth, it's valid to have | |
533 | * the AGP mapped at physical address 0 | |
534 | * --BenH. | |
535 | */ | |
1545085a | 536 | if (!vma->vm_pgoff |
a7fb8a23 | 537 | #if IS_ENABLED(CONFIG_AGP) |
b5e89ed5 DA |
538 | && (!dev->agp |
539 | || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) | |
1da177e4 LT |
540 | #endif |
541 | ) | |
542 | return drm_mmap_dma(filp, vma); | |
543 | ||
1545085a | 544 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { |
8d153f71 TH |
545 | DRM_ERROR("Could not find map\n"); |
546 | return -EINVAL; | |
1da177e4 LT |
547 | } |
548 | ||
55910517 | 549 | map = drm_hash_entry(hash, struct drm_map_list, hash)->map; |
b5e89ed5 | 550 | if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) |
1da177e4 LT |
551 | return -EPERM; |
552 | ||
b5e89ed5 | 553 | /* Check for valid size. */ |
54ba2f76 | 554 | if (map->size < vma->vm_end - vma->vm_start) |
b5e89ed5 | 555 | return -EINVAL; |
1da177e4 LT |
556 | |
557 | if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { | |
558 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
559 | #if defined(__i386__) || defined(__x86_64__) | |
560 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
561 | #else | |
b5e89ed5 DA |
562 | /* Ye gads this is ugly. With more thought |
563 | we could move this up higher and use | |
564 | `protection_map' instead. */ | |
565 | vma->vm_page_prot = | |
566 | __pgprot(pte_val | |
567 | (pte_wrprotect | |
568 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
1da177e4 LT |
569 | #endif |
570 | } | |
571 | ||
572 | switch (map->type) { | |
4b7fb9b5 | 573 | #if !defined(__arm__) |
b5e89ed5 | 574 | case _DRM_AGP: |
d9906753 | 575 | if (dev->agp && dev->agp->cant_use_aperture) { |
b5e89ed5 DA |
576 | /* |
577 | * On some platforms we can't talk to bus dma address from the CPU, so for | |
578 | * memory of type DRM_AGP, we'll deal with sorting out the real physical | |
ca0b07d9 | 579 | * pages and mappings in fault() |
b5e89ed5 | 580 | */ |
1da177e4 | 581 | #if defined(__powerpc__) |
37035e74 | 582 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
1da177e4 | 583 | #endif |
b5e89ed5 DA |
584 | vma->vm_ops = &drm_vm_ops; |
585 | break; | |
586 | } | |
587 | /* fall through to _DRM_FRAME_BUFFER... */ | |
4b7fb9b5 | 588 | #endif |
1da177e4 LT |
589 | case _DRM_FRAME_BUFFER: |
590 | case _DRM_REGISTERS: | |
cbc60ca0 | 591 | offset = drm_core_get_reg_ofs(dev); |
ff47eaf2 | 592 | vma->vm_page_prot = drm_io_prot(map, vma); |
3d77461e | 593 | if (io_remap_pfn_range(vma, vma->vm_start, |
b5e89ed5 DA |
594 | (map->offset + offset) >> PAGE_SHIFT, |
595 | vma->vm_end - vma->vm_start, | |
596 | vma->vm_page_prot)) | |
b5e89ed5 | 597 | return -EAGAIN; |
1da177e4 | 598 | DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," |
41c2e75e | 599 | " offset = 0x%llx\n", |
1da177e4 | 600 | map->type, |
41c2e75e | 601 | vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset)); |
4b7fb9b5 | 602 | |
1da177e4 LT |
603 | vma->vm_ops = &drm_vm_ops; |
604 | break; | |
2d0f9eaf | 605 | case _DRM_CONSISTENT: |
38315878 | 606 | /* Consistent memory is really like shared memory. But |
ca0b07d9 | 607 | * it's allocated in a different way, so avoid fault */ |
38315878 HD |
608 | if (remap_pfn_range(vma, vma->vm_start, |
609 | page_to_pfn(virt_to_page(map->handle)), | |
610 | vma->vm_end - vma->vm_start, vma->vm_page_prot)) | |
611 | return -EAGAIN; | |
6876b3ba | 612 | vma->vm_page_prot = drm_dma_prot(map->type, vma); |
38315878 HD |
613 | /* fall through to _DRM_SHM */ |
614 | case _DRM_SHM: | |
1da177e4 LT |
615 | vma->vm_ops = &drm_vm_shm_ops; |
616 | vma->vm_private_data = (void *)map; | |
1da177e4 LT |
617 | break; |
618 | case _DRM_SCATTER_GATHER: | |
619 | vma->vm_ops = &drm_vm_sg_ops; | |
620 | vma->vm_private_data = (void *)map; | |
5ff64611 | 621 | vma->vm_page_prot = drm_dma_prot(map->type, vma); |
b5e89ed5 | 622 | break; |
1da177e4 LT |
623 | default: |
624 | return -EINVAL; /* This should never happen. */ | |
625 | } | |
314e51b9 | 626 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
1da177e4 | 627 | |
b06d66be | 628 | drm_vm_open_locked(dev, vma); |
1da177e4 LT |
629 | return 0; |
630 | } | |
b5e89ed5 | 631 | |
bfbf3c85 | 632 | int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma) |
d7d8aac7 | 633 | { |
84b1fd10 | 634 | struct drm_file *priv = filp->private_data; |
2c14f28b | 635 | struct drm_device *dev = priv->minor->dev; |
d7d8aac7 TH |
636 | int ret; |
637 | ||
c07dcd61 | 638 | if (drm_dev_is_unplugged(dev)) |
2c07a21d DA |
639 | return -ENODEV; |
640 | ||
d7d8aac7 TH |
641 | mutex_lock(&dev->struct_mutex); |
642 | ret = drm_mmap_locked(filp, vma); | |
643 | mutex_unlock(&dev->struct_mutex); | |
644 | ||
645 | return ret; | |
646 | } | |
bfbf3c85 | 647 | EXPORT_SYMBOL(drm_legacy_mmap); |
03decbe5 DH |
648 | |
649 | void drm_legacy_vma_flush(struct drm_device *dev) | |
650 | { | |
651 | struct drm_vma_entry *vma, *vma_temp; | |
652 | ||
653 | /* Clear vma list (only needed for legacy drivers) */ | |
654 | list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { | |
655 | list_del(&vma->head); | |
656 | kfree(vma); | |
657 | } | |
658 | } |