blob: c234c6f24a8d8fd157a1af029d530d5bbc09bd84 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
Dave Airlieb5e89ed2005-09-25 14:28:13 +10002 * \file drm_vm.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Memory mapping for DRM
Dave Airlieb5e89ed2005-09-25 14:28:13 +10004 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * \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
Dave Airliec94f7022005-07-07 21:03:38 +100041static void drm_vm_open(struct vm_area_struct *vma);
42static void drm_vm_close(struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
Adrian Bunk0bead7c2007-03-11 11:41:16 +110044static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
Dave Airlie5cc7f9a2007-02-10 11:53:13 +110045{
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;
Benjamin Herrenschmidt6876b3b2008-03-28 14:23:07 -070057#elif defined(__ia64__)
Dave Airlie5cc7f9a2007-02-10 11:53:13 +110058 if (efi_range_is_wc(vma->vm_start, vma->vm_end -
59 vma->vm_start))
60 tmp = pgprot_writecombine(tmp);
61 else
62 tmp = pgprot_noncached(tmp);
Benjamin Herrenschmidt6876b3b2008-03-28 14:23:07 -070063#elif defined(__sparc__)
64 tmp = pgprot_noncached(tmp);
65#endif
66 return tmp;
67}
68
69static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
70{
71 pgprot_t tmp = vm_get_page_prot(vma->vm_flags);
72
73#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
74 tmp |= _PAGE_NO_CACHE;
Dave Airlie5cc7f9a2007-02-10 11:53:13 +110075#endif
76 return tmp;
77}
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079/**
Nick Pigginca0b07d2008-02-07 16:20:50 +100080 * \c fault method for AGP virtual memory.
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 *
82 * \param vma virtual memory area.
83 * \param address access address.
84 * \return pointer to the page structure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100085 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 * Find the right map and if it's AGP memory find the real physical page to
87 * map, get the page, increment the use count and return it.
88 */
89#if __OS_HAS_AGP
Nick Pigginca0b07d2008-02-07 16:20:50 +100090static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
Dave Airlie84b1fd12007-07-11 15:53:27 +100092 struct drm_file *priv = vma->vm_file->private_data;
Dave Airlie2c14f282008-04-21 16:47:32 +100093 struct drm_device *dev = priv->minor->dev;
Dave Airliec60ce622007-07-11 15:27:12 +100094 struct drm_map *map = NULL;
Dave Airlie55910512007-07-11 16:53:40 +100095 struct drm_map_list *r_list;
Dave Airliee0be4282007-07-12 10:26:44 +100096 struct drm_hash_item *hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98 /*
Dave Airlieb5e89ed2005-09-25 14:28:13 +100099 * Find the right map
100 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 if (!drm_core_has_AGP(dev))
Nick Pigginca0b07d2008-02-07 16:20:50 +1000102 goto vm_fault_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000104 if (!dev->agp || !dev->agp->cant_use_aperture)
Nick Pigginca0b07d2008-02-07 16:20:50 +1000105 goto vm_fault_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Thomas Hellstrom15450852007-02-08 16:14:05 +1100107 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
Nick Pigginca0b07d2008-02-07 16:20:50 +1000108 goto vm_fault_error;
Thomas Hellstrom8d153f72006-08-07 22:36:47 +1000109
Dave Airlie55910512007-07-11 16:53:40 +1000110 r_list = drm_hash_entry(hash, struct drm_map_list, hash);
Thomas Hellstrom8d153f72006-08-07 22:36:47 +1000111 map = r_list->map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 if (map && map->type == _DRM_AGP) {
Nick Pigginca0b07d2008-02-07 16:20:50 +1000114 /*
115 * Using vm_pgoff as a selector forces us to use this unusual
116 * addressing scheme.
117 */
118 unsigned long offset = (unsigned long)vmf->virtual_address -
119 vma->vm_start;
Dave Airlied1f2b552005-08-05 22:11:22 +1000120 unsigned long baddr = map->offset + offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 struct drm_agp_mem *agpmem;
122 struct page *page;
123
124#ifdef __alpha__
125 /*
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000126 * Adjust to a bus-relative address
127 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 baddr -= dev->hose->mem_space->start;
129#endif
130
131 /*
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000132 * It's AGP memory - find the real physical page to map
133 */
Dave Airliebd1b3312007-05-26 05:01:51 +1000134 list_for_each_entry(agpmem, &dev->agp->memory, head) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 if (agpmem->bound <= baddr &&
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000136 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 break;
138 }
139
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000140 if (!agpmem)
Nick Pigginca0b07d2008-02-07 16:20:50 +1000141 goto vm_fault_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143 /*
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000144 * Get the page, inc the use count, and return it
145 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
147 page = virt_to_page(__va(agpmem->memory->memory[offset]));
148 get_page(page);
Nick Pigginca0b07d2008-02-07 16:20:50 +1000149 vmf->page = page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000151 DRM_DEBUG
152 ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
153 baddr, __va(agpmem->memory->memory[offset]), offset,
154 page_count(page));
Nick Pigginca0b07d2008-02-07 16:20:50 +1000155 return 0;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000156 }
Nick Pigginca0b07d2008-02-07 16:20:50 +1000157vm_fault_error:
158 return VM_FAULT_SIGBUS; /* Disallow mremap */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000160#else /* __OS_HAS_AGP */
Nick Pigginca0b07d2008-02-07 16:20:50 +1000161static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
Nick Pigginca0b07d2008-02-07 16:20:50 +1000163 return VM_FAULT_SIGBUS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000165#endif /* __OS_HAS_AGP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
167/**
168 * \c nopage method for shared virtual memory.
169 *
170 * \param vma virtual memory area.
171 * \param address access address.
172 * \return pointer to the page structure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000173 *
Michael Opdenacker59c51592007-05-09 08:57:56 +0200174 * Get the mapping, find the real physical page to map, get the page, and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 * return it.
176 */
Nick Pigginca0b07d2008-02-07 16:20:50 +1000177static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
Dave Airliec60ce622007-07-11 15:27:12 +1000179 struct drm_map *map = (struct drm_map *) vma->vm_private_data;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000180 unsigned long offset;
181 unsigned long i;
182 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000184 if (!map)
Nick Pigginca0b07d2008-02-07 16:20:50 +1000185 return VM_FAULT_SIGBUS; /* Nothing allocated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Nick Pigginca0b07d2008-02-07 16:20:50 +1000187 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 i = (unsigned long)map->handle + offset;
Hugh Dickins38315872007-03-24 17:55:16 +1100189 page = vmalloc_to_page((void *)i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 if (!page)
Nick Pigginca0b07d2008-02-07 16:20:50 +1000191 return VM_FAULT_SIGBUS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 get_page(page);
Nick Pigginca0b07d2008-02-07 16:20:50 +1000193 vmf->page = page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Nick Pigginca0b07d2008-02-07 16:20:50 +1000195 DRM_DEBUG("shm_fault 0x%lx\n", offset);
196 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199/**
200 * \c close method for shared virtual memory.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000201 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 * \param vma virtual memory area.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000203 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 * Deletes map information if we are the last
205 * person to close a mapping and it's not in the global maplist.
206 */
Dave Airliec94f7022005-07-07 21:03:38 +1000207static void drm_vm_shm_close(struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000209 struct drm_file *priv = vma->vm_file->private_data;
Dave Airlie2c14f282008-04-21 16:47:32 +1000210 struct drm_device *dev = priv->minor->dev;
Dave Airlie8fc2fdf2007-07-11 16:21:47 +1000211 struct drm_vma_entry *pt, *temp;
Dave Airliec60ce622007-07-11 15:27:12 +1000212 struct drm_map *map;
Dave Airlie55910512007-07-11 16:53:40 +1000213 struct drm_map_list *r_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 int found_maps = 0;
215
216 DRM_DEBUG("0x%08lx,0x%08lx\n",
217 vma->vm_start, vma->vm_end - vma->vm_start);
218 atomic_dec(&dev->vma_count);
219
220 map = vma->vm_private_data;
221
Dave Airlie30e2fb12006-02-02 19:37:46 +1100222 mutex_lock(&dev->struct_mutex);
Dave Airliebd1b3312007-05-26 05:01:51 +1000223 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000224 if (pt->vma->vm_private_data == map)
225 found_maps++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 if (pt->vma == vma) {
Dave Airliebd1b3312007-05-26 05:01:51 +1000227 list_del(&pt->head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 }
230 }
Dave Airliebd1b3312007-05-26 05:01:51 +1000231
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 /* We were the only map that was found */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000233 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 /* Check to see if we are in the maplist, if we are not, then
235 * we delete this mappings information.
236 */
237 found_maps = 0;
Dave Airliebd1b3312007-05-26 05:01:51 +1000238 list_for_each_entry(r_list, &dev->maplist, head) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000239 if (r_list->map == map)
240 found_maps++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 }
242
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000243 if (!found_maps) {
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000244 drm_dma_handle_t dmah;
245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 switch (map->type) {
247 case _DRM_REGISTERS:
248 case _DRM_FRAME_BUFFER:
249 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
250 int retcode;
251 retcode = mtrr_del(map->mtrr,
252 map->offset,
253 map->size);
254 DRM_DEBUG("mtrr_del = %d\n", retcode);
255 }
Christoph Hellwig004a7722007-01-08 21:56:59 +1100256 iounmap(map->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 break;
258 case _DRM_SHM:
259 vfree(map->handle);
260 break;
261 case _DRM_AGP:
262 case _DRM_SCATTER_GATHER:
263 break;
Dave Airlie2d0f9ea2005-07-10 14:34:13 +1000264 case _DRM_CONSISTENT:
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000265 dmah.vaddr = map->handle;
266 dmah.busaddr = map->offset;
267 dmah.size = map->size;
268 __drm_pci_free(dev, &dmah);
Dave Airlie2d0f9ea2005-07-10 14:34:13 +1000269 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 }
271 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
272 }
273 }
Dave Airlie30e2fb12006-02-02 19:37:46 +1100274 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275}
276
277/**
Nick Pigginca0b07d2008-02-07 16:20:50 +1000278 * \c fault method for DMA virtual memory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 *
280 * \param vma virtual memory area.
281 * \param address access address.
282 * \return pointer to the page structure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000283 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
285 */
Nick Pigginca0b07d2008-02-07 16:20:50 +1000286static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000288 struct drm_file *priv = vma->vm_file->private_data;
Dave Airlie2c14f282008-04-21 16:47:32 +1000289 struct drm_device *dev = priv->minor->dev;
Dave Airliecdd55a22007-07-11 16:32:08 +1000290 struct drm_device_dma *dma = dev->dma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000291 unsigned long offset;
292 unsigned long page_nr;
293 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000295 if (!dma)
Nick Pigginca0b07d2008-02-07 16:20:50 +1000296 return VM_FAULT_SIGBUS; /* Error */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000297 if (!dma->pagelist)
Nick Pigginca0b07d2008-02-07 16:20:50 +1000298 return VM_FAULT_SIGBUS; /* Nothing allocated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Nick Pigginca0b07d2008-02-07 16:20:50 +1000300 offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
301 page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000302 page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304 get_page(page);
Nick Pigginca0b07d2008-02-07 16:20:50 +1000305 vmf->page = page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Nick Pigginca0b07d2008-02-07 16:20:50 +1000307 DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
308 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309}
310
311/**
Nick Pigginca0b07d2008-02-07 16:20:50 +1000312 * \c fault method for scatter-gather virtual memory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 *
314 * \param vma virtual memory area.
315 * \param address access address.
316 * \return pointer to the page structure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000317 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
319 */
Nick Pigginca0b07d2008-02-07 16:20:50 +1000320static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Dave Airliec60ce622007-07-11 15:27:12 +1000322 struct drm_map *map = (struct drm_map *) vma->vm_private_data;
Dave Airlie84b1fd12007-07-11 15:53:27 +1000323 struct drm_file *priv = vma->vm_file->private_data;
Dave Airlie2c14f282008-04-21 16:47:32 +1000324 struct drm_device *dev = priv->minor->dev;
Dave Airlie55910512007-07-11 16:53:40 +1000325 struct drm_sg_mem *entry = dev->sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 unsigned long offset;
327 unsigned long map_offset;
328 unsigned long page_offset;
329 struct page *page;
330
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000331 if (!entry)
Nick Pigginca0b07d2008-02-07 16:20:50 +1000332 return VM_FAULT_SIGBUS; /* Error */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000333 if (!entry->pagelist)
Nick Pigginca0b07d2008-02-07 16:20:50 +1000334 return VM_FAULT_SIGBUS; /* Nothing allocated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Nick Pigginca0b07d2008-02-07 16:20:50 +1000336 offset = (unsigned long)vmf->virtual_address - vma->vm_start;
Dave Airlied1f2b552005-08-05 22:11:22 +1000337 map_offset = map->offset - (unsigned long)dev->sg->virtual;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
339 page = entry->pagelist[page_offset];
340 get_page(page);
Nick Pigginca0b07d2008-02-07 16:20:50 +1000341 vmf->page = page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
Nick Pigginca0b07d2008-02-07 16:20:50 +1000343 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345
Nick Pigginca0b07d2008-02-07 16:20:50 +1000346static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000347{
Nick Pigginca0b07d2008-02-07 16:20:50 +1000348 return drm_do_vm_fault(vma, vmf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349}
350
Nick Pigginca0b07d2008-02-07 16:20:50 +1000351static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000352{
Nick Pigginca0b07d2008-02-07 16:20:50 +1000353 return drm_do_vm_shm_fault(vma, vmf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354}
355
Nick Pigginca0b07d2008-02-07 16:20:50 +1000356static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000357{
Nick Pigginca0b07d2008-02-07 16:20:50 +1000358 return drm_do_vm_dma_fault(vma, vmf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359}
360
Nick Pigginca0b07d2008-02-07 16:20:50 +1000361static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000362{
Nick Pigginca0b07d2008-02-07 16:20:50 +1000363 return drm_do_vm_sg_fault(vma, vmf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364}
365
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366/** AGP virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000367static struct vm_operations_struct drm_vm_ops = {
Nick Pigginca0b07d2008-02-07 16:20:50 +1000368 .fault = drm_vm_fault,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000369 .open = drm_vm_open,
370 .close = drm_vm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371};
372
373/** Shared virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000374static struct vm_operations_struct drm_vm_shm_ops = {
Nick Pigginca0b07d2008-02-07 16:20:50 +1000375 .fault = drm_vm_shm_fault,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000376 .open = drm_vm_open,
377 .close = drm_vm_shm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378};
379
380/** DMA virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000381static struct vm_operations_struct drm_vm_dma_ops = {
Nick Pigginca0b07d2008-02-07 16:20:50 +1000382 .fault = drm_vm_dma_fault,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000383 .open = drm_vm_open,
384 .close = drm_vm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385};
386
387/** Scatter-gather virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000388static struct vm_operations_struct drm_vm_sg_ops = {
Nick Pigginca0b07d2008-02-07 16:20:50 +1000389 .fault = drm_vm_sg_fault,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000390 .open = drm_vm_open,
391 .close = drm_vm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392};
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394/**
395 * \c open method for shared virtual memory.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000396 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 * \param vma virtual memory area.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000398 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 * Create a new drm_vma_entry structure as the \p vma private data entry and
400 * add it to drm_device::vmalist.
401 */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100402static void drm_vm_open_locked(struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000404 struct drm_file *priv = vma->vm_file->private_data;
Dave Airlie2c14f282008-04-21 16:47:32 +1000405 struct drm_device *dev = priv->minor->dev;
Dave Airlie8fc2fdf2007-07-11 16:21:47 +1000406 struct drm_vma_entry *vma_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
408 DRM_DEBUG("0x%08lx,0x%08lx\n",
409 vma->vm_start, vma->vm_end - vma->vm_start);
410 atomic_inc(&dev->vma_count);
411
412 vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
413 if (vma_entry) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000414 vma_entry->vma = vma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000415 vma_entry->pid = current->pid;
Dave Airliebd1b3312007-05-26 05:01:51 +1000416 list_add(&vma_entry->head, &dev->vmalist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 }
418}
419
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100420static void drm_vm_open(struct vm_area_struct *vma)
421{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000422 struct drm_file *priv = vma->vm_file->private_data;
Dave Airlie2c14f282008-04-21 16:47:32 +1000423 struct drm_device *dev = priv->minor->dev;
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100424
425 mutex_lock(&dev->struct_mutex);
426 drm_vm_open_locked(vma);
427 mutex_unlock(&dev->struct_mutex);
428}
429
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430/**
431 * \c close method for all virtual memory types.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000432 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 * \param vma virtual memory area.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000434 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
436 * free it.
437 */
Dave Airliec94f7022005-07-07 21:03:38 +1000438static void drm_vm_close(struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000440 struct drm_file *priv = vma->vm_file->private_data;
Dave Airlie2c14f282008-04-21 16:47:32 +1000441 struct drm_device *dev = priv->minor->dev;
Dave Airlie8fc2fdf2007-07-11 16:21:47 +1000442 struct drm_vma_entry *pt, *temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444 DRM_DEBUG("0x%08lx,0x%08lx\n",
445 vma->vm_start, vma->vm_end - vma->vm_start);
446 atomic_dec(&dev->vma_count);
447
Dave Airlie30e2fb12006-02-02 19:37:46 +1100448 mutex_lock(&dev->struct_mutex);
Dave Airliebd1b3312007-05-26 05:01:51 +1000449 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 if (pt->vma == vma) {
Dave Airliebd1b3312007-05-26 05:01:51 +1000451 list_del(&pt->head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
453 break;
454 }
455 }
Dave Airlie30e2fb12006-02-02 19:37:46 +1100456 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457}
458
459/**
460 * mmap DMA memory.
461 *
Eric Anholt6c340ea2007-08-25 20:23:09 +1000462 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 * \param vma virtual memory area.
464 * \return zero on success or a negative number on failure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000465 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 * Sets the virtual memory area operations structure to vm_dma_ops, the file
467 * pointer, and calls vm_open().
468 */
Dave Airliec94f7022005-07-07 21:03:38 +1000469static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000471 struct drm_file *priv = filp->private_data;
472 struct drm_device *dev;
Dave Airliecdd55a22007-07-11 16:32:08 +1000473 struct drm_device_dma *dma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000474 unsigned long length = vma->vm_end - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
Dave Airlie2c14f282008-04-21 16:47:32 +1000476 dev = priv->minor->dev;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000477 dma = dev->dma;
Thomas Hellstrom15450852007-02-08 16:14:05 +1100478 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
479 vma->vm_start, vma->vm_end, vma->vm_pgoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000481 /* Length must match exact page count */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 return -EINVAL;
484 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
George Sapountzis3417f332006-10-24 12:03:04 -0700486 if (!capable(CAP_SYS_ADMIN) &&
487 (dma->flags & _DRM_DMA_USE_PCI_RO)) {
488 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
489#if defined(__i386__) || defined(__x86_64__)
490 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
491#else
492 /* Ye gads this is ugly. With more thought
493 we could move this up higher and use
494 `protection_map' instead. */
495 vma->vm_page_prot =
496 __pgprot(pte_val
497 (pte_wrprotect
498 (__pte(pgprot_val(vma->vm_page_prot)))));
499#endif
500 }
501
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000502 vma->vm_ops = &drm_vm_dma_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000504 vma->vm_flags |= VM_RESERVED; /* Don't swap */
Nick Piggin2f987352008-02-02 03:08:53 +0100505 vma->vm_flags |= VM_DONTEXPAND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000507 vma->vm_file = filp; /* Needed for drm_vm_open() */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100508 drm_vm_open_locked(vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 return 0;
510}
511
Dave Airliec60ce622007-07-11 15:27:12 +1000512unsigned long drm_core_get_map_ofs(struct drm_map * map)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513{
514 return map->offset;
515}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000516
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517EXPORT_SYMBOL(drm_core_get_map_ofs);
518
519unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
520{
521#ifdef __alpha__
522 return dev->hose->dense_mem_base - dev->hose->mem_space->start;
523#else
524 return 0;
525#endif
526}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000527
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528EXPORT_SYMBOL(drm_core_get_reg_ofs);
529
530/**
531 * mmap DMA memory.
532 *
Eric Anholt6c340ea2007-08-25 20:23:09 +1000533 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 * \param vma virtual memory area.
535 * \return zero on success or a negative number on failure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000536 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 * If the virtual memory area has no offset associated with it then it's a DMA
538 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
539 * checks that the restricted flag is not set, sets the virtual memory operations
540 * according to the mapping type and remaps the pages. Finally sets the file
541 * pointer and calls vm_open().
542 */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100543static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000545 struct drm_file *priv = filp->private_data;
Dave Airlie2c14f282008-04-21 16:47:32 +1000546 struct drm_device *dev = priv->minor->dev;
Dave Airliec60ce622007-07-11 15:27:12 +1000547 struct drm_map *map = NULL;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000548 unsigned long offset = 0;
Dave Airliee0be4282007-07-12 10:26:44 +1000549 struct drm_hash_item *hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Thomas Hellstrom15450852007-02-08 16:14:05 +1100551 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
552 vma->vm_start, vma->vm_end, vma->vm_pgoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000554 if (!priv->authenticated)
555 return -EACCES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557 /* We check for "dma". On Apple's UniNorth, it's valid to have
558 * the AGP mapped at physical address 0
559 * --BenH.
560 */
Thomas Hellstrom15450852007-02-08 16:14:05 +1100561 if (!vma->vm_pgoff
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562#if __OS_HAS_AGP
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000563 && (!dev->agp
564 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565#endif
566 )
567 return drm_mmap_dma(filp, vma);
568
Thomas Hellstrom15450852007-02-08 16:14:05 +1100569 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
Thomas Hellstrom8d153f72006-08-07 22:36:47 +1000570 DRM_ERROR("Could not find map\n");
571 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 }
573
Dave Airlie55910512007-07-11 16:53:40 +1000574 map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000575 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 return -EPERM;
577
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000578 /* Check for valid size. */
Dave Airlie54ba2f72007-02-10 12:07:47 +1100579 if (map->size < vma->vm_end - vma->vm_start)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000580 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
582 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
583 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
584#if defined(__i386__) || defined(__x86_64__)
585 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
586#else
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000587 /* Ye gads this is ugly. With more thought
588 we could move this up higher and use
589 `protection_map' instead. */
590 vma->vm_page_prot =
591 __pgprot(pte_val
592 (pte_wrprotect
593 (__pte(pgprot_val(vma->vm_page_prot)))));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594#endif
595 }
596
597 switch (map->type) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000598 case _DRM_AGP:
599 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
600 /*
601 * On some platforms we can't talk to bus dma address from the CPU, so for
602 * memory of type DRM_AGP, we'll deal with sorting out the real physical
Nick Pigginca0b07d2008-02-07 16:20:50 +1000603 * pages and mappings in fault()
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000604 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605#if defined(__powerpc__)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000606 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607#endif
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000608 vma->vm_ops = &drm_vm_ops;
609 break;
610 }
611 /* fall through to _DRM_FRAME_BUFFER... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 case _DRM_FRAME_BUFFER:
613 case _DRM_REGISTERS:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 offset = dev->driver->get_reg_ofs(dev);
Dave Airlie5cc7f9a2007-02-10 11:53:13 +1100615 vma->vm_flags |= VM_IO; /* not in core dump */
616 vma->vm_page_prot = drm_io_prot(map->type, vma);
Dave Airlie9e9c1322007-03-24 17:57:54 +1100617 if (io_remap_pfn_range(vma, vma->vm_start,
618 (map->offset + offset) >> PAGE_SHIFT,
619 vma->vm_end - vma->vm_start,
620 vma->vm_page_prot))
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000621 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
623 " offset = 0x%lx\n",
624 map->type,
Dave Airlied1f2b552005-08-05 22:11:22 +1000625 vma->vm_start, vma->vm_end, map->offset + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 vma->vm_ops = &drm_vm_ops;
627 break;
Dave Airlie2d0f9ea2005-07-10 14:34:13 +1000628 case _DRM_CONSISTENT:
Hugh Dickins38315872007-03-24 17:55:16 +1100629 /* Consistent memory is really like shared memory. But
Nick Pigginca0b07d2008-02-07 16:20:50 +1000630 * it's allocated in a different way, so avoid fault */
Hugh Dickins38315872007-03-24 17:55:16 +1100631 if (remap_pfn_range(vma, vma->vm_start,
632 page_to_pfn(virt_to_page(map->handle)),
633 vma->vm_end - vma->vm_start, vma->vm_page_prot))
634 return -EAGAIN;
Benjamin Herrenschmidt6876b3b2008-03-28 14:23:07 -0700635 vma->vm_page_prot = drm_dma_prot(map->type, vma);
Hugh Dickins38315872007-03-24 17:55:16 +1100636 /* fall through to _DRM_SHM */
637 case _DRM_SHM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 vma->vm_ops = &drm_vm_shm_ops;
639 vma->vm_private_data = (void *)map;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000640 /* Don't let this area swap. Change when
641 DRM_KERNEL advisory is supported. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 vma->vm_flags |= VM_RESERVED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 break;
644 case _DRM_SCATTER_GATHER:
645 vma->vm_ops = &drm_vm_sg_ops;
646 vma->vm_private_data = (void *)map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 vma->vm_flags |= VM_RESERVED;
Benjamin Herrenschmidt5ff64612008-04-20 10:26:25 +1000648 vma->vm_page_prot = drm_dma_prot(map->type, vma);
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000649 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 default:
651 return -EINVAL; /* This should never happen. */
652 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000653 vma->vm_flags |= VM_RESERVED; /* Don't swap */
Nick Piggin2f987352008-02-02 03:08:53 +0100654 vma->vm_flags |= VM_DONTEXPAND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000656 vma->vm_file = filp; /* Needed for drm_vm_open() */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100657 drm_vm_open_locked(vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 return 0;
659}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000660
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100661int drm_mmap(struct file *filp, struct vm_area_struct *vma)
662{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000663 struct drm_file *priv = filp->private_data;
Dave Airlie2c14f282008-04-21 16:47:32 +1000664 struct drm_device *dev = priv->minor->dev;
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100665 int ret;
666
667 mutex_lock(&dev->struct_mutex);
668 ret = drm_mmap_locked(filp, vma);
669 mutex_unlock(&dev->struct_mutex);
670
671 return ret;
672}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673EXPORT_SYMBOL(drm_mmap);