Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /** |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 2 | * \file drm_vm.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * Memory mapping for DRM |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 4 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Howells | 760285e | 2012-10-02 18:01:07 +0100 | [diff] [blame] | 36 | #include <drm/drmP.h> |
Paul Gortmaker | 2d1a8a4 | 2011-08-30 18:16:33 -0400 | [diff] [blame] | 37 | #include <linux/export.h> |
David Herrmann | 03decbe | 2014-08-29 12:12:29 +0200 | [diff] [blame] | 38 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #if defined(__ia64__) |
| 40 | #include <linux/efi.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 41 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #endif |
David Herrmann | 2791ee8 | 2014-08-29 12:12:33 +0200 | [diff] [blame] | 43 | #include <asm/pgtable.h> |
David Herrmann | cc5ea59 | 2014-08-29 12:12:32 +0200 | [diff] [blame] | 44 | #include "drm_legacy.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
David Herrmann | 03decbe | 2014-08-29 12:12:29 +0200 | [diff] [blame] | 46 | struct drm_vma_entry { |
| 47 | struct list_head head; |
| 48 | struct vm_area_struct *vma; |
| 49 | pid_t pid; |
| 50 | }; |
| 51 | |
Dave Airlie | c94f702 | 2005-07-07 21:03:38 +1000 | [diff] [blame] | 52 | static void drm_vm_open(struct vm_area_struct *vma); |
| 53 | static void drm_vm_close(struct vm_area_struct *vma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Andy Lutomirski | ff47eaf | 2013-05-13 23:58:42 +0000 | [diff] [blame] | 55 | static pgprot_t drm_io_prot(struct drm_local_map *map, |
| 56 | struct vm_area_struct *vma) |
Dave Airlie | 5cc7f9a | 2007-02-10 11:53:13 +1100 | [diff] [blame] | 57 | { |
| 58 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); |
| 59 | |
| 60 | #if defined(__i386__) || defined(__x86_64__) |
Andy Lutomirski | f435046 | 2013-05-13 23:58:43 +0000 | [diff] [blame] | 61 | if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING)) |
| 62 | tmp = pgprot_noncached(tmp); |
| 63 | else |
| 64 | tmp = pgprot_writecombine(tmp); |
Dave Airlie | 5cc7f9a | 2007-02-10 11:53:13 +1100 | [diff] [blame] | 65 | #elif defined(__powerpc__) |
| 66 | pgprot_val(tmp) |= _PAGE_NO_CACHE; |
Andy Lutomirski | ff47eaf | 2013-05-13 23:58:42 +0000 | [diff] [blame] | 67 | if (map->type == _DRM_REGISTERS) |
Dave Airlie | 5cc7f9a | 2007-02-10 11:53:13 +1100 | [diff] [blame] | 68 | pgprot_val(tmp) |= _PAGE_GUARDED; |
Benjamin Herrenschmidt | 6876b3b | 2008-03-28 14:23:07 -0700 | [diff] [blame] | 69 | #elif defined(__ia64__) |
Dave Airlie | 5cc7f9a | 2007-02-10 11:53:13 +1100 | [diff] [blame] | 70 | if (efi_range_is_wc(vma->vm_start, vma->vm_end - |
| 71 | vma->vm_start)) |
| 72 | tmp = pgprot_writecombine(tmp); |
| 73 | else |
| 74 | tmp = pgprot_noncached(tmp); |
Huacai Chen | 04cf55e | 2012-08-11 09:32:17 +0000 | [diff] [blame] | 75 | #elif defined(__sparc__) || defined(__arm__) || defined(__mips__) |
Benjamin Herrenschmidt | 6876b3b | 2008-03-28 14:23:07 -0700 | [diff] [blame] | 76 | tmp = pgprot_noncached(tmp); |
| 77 | #endif |
| 78 | return tmp; |
| 79 | } |
| 80 | |
| 81 | static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma) |
| 82 | { |
| 83 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); |
| 84 | |
| 85 | #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) |
| 86 | tmp |= _PAGE_NO_CACHE; |
Dave Airlie | 5cc7f9a | 2007-02-10 11:53:13 +1100 | [diff] [blame] | 87 | #endif |
| 88 | return tmp; |
| 89 | } |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | /** |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 92 | * \c fault method for AGP virtual memory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | * |
| 94 | * \param vma virtual memory area. |
| 95 | * \param address access address. |
| 96 | * \return pointer to the page structure. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 97 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | * Find the right map and if it's AGP memory find the real physical page to |
| 99 | * map, get the page, increment the use count and return it. |
| 100 | */ |
| 101 | #if __OS_HAS_AGP |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 102 | static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 104 | struct drm_file *priv = vma->vm_file->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 105 | struct drm_device *dev = priv->minor->dev; |
Benjamin Herrenschmidt | f77d390 | 2009-02-02 16:55:46 +1100 | [diff] [blame] | 106 | struct drm_local_map *map = NULL; |
Dave Airlie | 5591051 | 2007-07-11 16:53:40 +1000 | [diff] [blame] | 107 | struct drm_map_list *r_list; |
Dave Airlie | e0be428 | 2007-07-12 10:26:44 +1000 | [diff] [blame] | 108 | struct drm_hash_item *hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | /* |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 111 | * Find the right map |
| 112 | */ |
Daniel Vetter | d990675 | 2013-12-11 11:34:35 +0100 | [diff] [blame] | 113 | if (!dev->agp) |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 114 | goto vm_fault_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 116 | if (!dev->agp || !dev->agp->cant_use_aperture) |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 117 | goto vm_fault_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Thomas Hellstrom | 1545085 | 2007-02-08 16:14:05 +1100 | [diff] [blame] | 119 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 120 | goto vm_fault_error; |
Thomas Hellstrom | 8d153f7 | 2006-08-07 22:36:47 +1000 | [diff] [blame] | 121 | |
Dave Airlie | 5591051 | 2007-07-11 16:53:40 +1000 | [diff] [blame] | 122 | r_list = drm_hash_entry(hash, struct drm_map_list, hash); |
Thomas Hellstrom | 8d153f7 | 2006-08-07 22:36:47 +1000 | [diff] [blame] | 123 | map = r_list->map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | if (map && map->type == _DRM_AGP) { |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 126 | /* |
| 127 | * Using vm_pgoff as a selector forces us to use this unusual |
| 128 | * addressing scheme. |
| 129 | */ |
Benjamin Herrenschmidt | 41c2e75 | 2009-02-02 16:55:47 +1100 | [diff] [blame] | 130 | resource_size_t offset = (unsigned long)vmf->virtual_address - |
| 131 | vma->vm_start; |
| 132 | resource_size_t baddr = map->offset + offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | struct drm_agp_mem *agpmem; |
| 134 | struct page *page; |
| 135 | |
| 136 | #ifdef __alpha__ |
| 137 | /* |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 138 | * Adjust to a bus-relative address |
| 139 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | baddr -= dev->hose->mem_space->start; |
| 141 | #endif |
| 142 | |
| 143 | /* |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 144 | * It's AGP memory - find the real physical page to map |
| 145 | */ |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 146 | list_for_each_entry(agpmem, &dev->agp->memory, head) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | if (agpmem->bound <= baddr && |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 148 | agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | break; |
| 150 | } |
| 151 | |
Dan Carpenter | 161c481 | 2010-08-19 11:39:57 +0200 | [diff] [blame] | 152 | if (&agpmem->head == &dev->agp->memory) |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 153 | goto vm_fault_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
| 155 | /* |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 156 | * Get the page, inc the use count, and return it |
| 157 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | offset = (baddr - agpmem->bound) >> PAGE_SHIFT; |
Dave Airlie | 07613ba | 2009-06-12 14:11:41 +1000 | [diff] [blame] | 159 | page = agpmem->memory->pages[offset]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | get_page(page); |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 161 | vmf->page = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 163 | DRM_DEBUG |
Benjamin Herrenschmidt | 41c2e75 | 2009-02-02 16:55:47 +1100 | [diff] [blame] | 164 | ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n", |
| 165 | (unsigned long long)baddr, |
Dave Airlie | 07613ba | 2009-06-12 14:11:41 +1000 | [diff] [blame] | 166 | agpmem->memory->pages[offset], |
Benjamin Herrenschmidt | 41c2e75 | 2009-02-02 16:55:47 +1100 | [diff] [blame] | 167 | (unsigned long long)offset, |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 168 | page_count(page)); |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 169 | return 0; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 170 | } |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 171 | vm_fault_error: |
| 172 | return VM_FAULT_SIGBUS; /* Disallow mremap */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | } |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 174 | #else /* __OS_HAS_AGP */ |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 175 | static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | { |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 177 | return VM_FAULT_SIGBUS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 179 | #endif /* __OS_HAS_AGP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
| 181 | /** |
| 182 | * \c nopage method for shared virtual memory. |
| 183 | * |
| 184 | * \param vma virtual memory area. |
| 185 | * \param address access address. |
| 186 | * \return pointer to the page structure. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 187 | * |
Michael Opdenacker | 59c5159 | 2007-05-09 08:57:56 +0200 | [diff] [blame] | 188 | * Get the mapping, find the real physical page to map, get the page, and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | * return it. |
| 190 | */ |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 191 | static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | { |
Benjamin Herrenschmidt | f77d390 | 2009-02-02 16:55:46 +1100 | [diff] [blame] | 193 | struct drm_local_map *map = vma->vm_private_data; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 194 | unsigned long offset; |
| 195 | unsigned long i; |
| 196 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 198 | if (!map) |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 199 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 201 | offset = (unsigned long)vmf->virtual_address - vma->vm_start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | i = (unsigned long)map->handle + offset; |
Hugh Dickins | 3831587 | 2007-03-24 17:55:16 +1100 | [diff] [blame] | 203 | page = vmalloc_to_page((void *)i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | if (!page) |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 205 | return VM_FAULT_SIGBUS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | get_page(page); |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 207 | vmf->page = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 209 | DRM_DEBUG("shm_fault 0x%lx\n", offset); |
| 210 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | /** |
| 214 | * \c close method for shared virtual memory. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 215 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | * \param vma virtual memory area. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 217 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | * Deletes map information if we are the last |
| 219 | * person to close a mapping and it's not in the global maplist. |
| 220 | */ |
Dave Airlie | c94f702 | 2005-07-07 21:03:38 +1000 | [diff] [blame] | 221 | static void drm_vm_shm_close(struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 223 | struct drm_file *priv = vma->vm_file->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 224 | struct drm_device *dev = priv->minor->dev; |
Dave Airlie | 8fc2fdf | 2007-07-11 16:21:47 +1000 | [diff] [blame] | 225 | struct drm_vma_entry *pt, *temp; |
Benjamin Herrenschmidt | f77d390 | 2009-02-02 16:55:46 +1100 | [diff] [blame] | 226 | struct drm_local_map *map; |
Dave Airlie | 5591051 | 2007-07-11 16:53:40 +1000 | [diff] [blame] | 227 | struct drm_map_list *r_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | int found_maps = 0; |
| 229 | |
| 230 | DRM_DEBUG("0x%08lx,0x%08lx\n", |
| 231 | vma->vm_start, vma->vm_end - vma->vm_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
| 233 | map = vma->vm_private_data; |
| 234 | |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 235 | mutex_lock(&dev->struct_mutex); |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 236 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 237 | if (pt->vma->vm_private_data == map) |
| 238 | found_maps++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | if (pt->vma == vma) { |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 240 | list_del(&pt->head); |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 241 | kfree(pt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
| 243 | } |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | /* We were the only map that was found */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 246 | if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | /* Check to see if we are in the maplist, if we are not, then |
| 248 | * we delete this mappings information. |
| 249 | */ |
| 250 | found_maps = 0; |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 251 | list_for_each_entry(r_list, &dev->maplist, head) { |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 252 | if (r_list->map == map) |
| 253 | found_maps++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } |
| 255 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 256 | if (!found_maps) { |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 257 | drm_dma_handle_t dmah; |
| 258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | switch (map->type) { |
| 260 | case _DRM_REGISTERS: |
| 261 | case _DRM_FRAME_BUFFER: |
Daniel Vetter | 2818564 | 2013-08-08 15:41:27 +0200 | [diff] [blame] | 262 | arch_phys_wc_del(map->mtrr); |
Christoph Hellwig | 004a772 | 2007-01-08 21:56:59 +1100 | [diff] [blame] | 263 | iounmap(map->handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | break; |
| 265 | case _DRM_SHM: |
| 266 | vfree(map->handle); |
| 267 | break; |
| 268 | case _DRM_AGP: |
| 269 | case _DRM_SCATTER_GATHER: |
| 270 | break; |
Dave Airlie | 2d0f9ea | 2005-07-10 14:34:13 +1000 | [diff] [blame] | 271 | case _DRM_CONSISTENT: |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 272 | dmah.vaddr = map->handle; |
| 273 | dmah.busaddr = map->offset; |
| 274 | dmah.size = map->size; |
Daniel Vetter | 1c96e84 | 2014-09-10 12:43:51 +0200 | [diff] [blame] | 275 | __drm_legacy_pci_free(dev, &dmah); |
Dave Airlie | 2d0f9ea | 2005-07-10 14:34:13 +1000 | [diff] [blame] | 276 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | } |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 278 | kfree(map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | } |
| 280 | } |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 281 | mutex_unlock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | /** |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 285 | * \c fault method for DMA virtual memory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | * |
| 287 | * \param vma virtual memory area. |
| 288 | * \param address access address. |
| 289 | * \return pointer to the page structure. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 290 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | * Determine the page number from the page offset and get it from drm_device_dma::pagelist. |
| 292 | */ |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 293 | static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 295 | struct drm_file *priv = vma->vm_file->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 296 | struct drm_device *dev = priv->minor->dev; |
Dave Airlie | cdd55a2 | 2007-07-11 16:32:08 +1000 | [diff] [blame] | 297 | struct drm_device_dma *dma = dev->dma; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 298 | unsigned long offset; |
| 299 | unsigned long page_nr; |
| 300 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 302 | if (!dma) |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 303 | return VM_FAULT_SIGBUS; /* Error */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 304 | if (!dma->pagelist) |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 305 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 307 | offset = (unsigned long)vmf->virtual_address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ |
| 308 | page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */ |
Ben Hutchings | e1e7853 | 2013-10-27 21:52:39 +0000 | [diff] [blame] | 309 | page = virt_to_page((void *)dma->pagelist[page_nr]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
| 311 | get_page(page); |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 312 | vmf->page = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 314 | DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr); |
| 315 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | /** |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 319 | * \c fault method for scatter-gather virtual memory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | * |
| 321 | * \param vma virtual memory area. |
| 322 | * \param address access address. |
| 323 | * \return pointer to the page structure. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 324 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. |
| 326 | */ |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 327 | static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | { |
Benjamin Herrenschmidt | f77d390 | 2009-02-02 16:55:46 +1100 | [diff] [blame] | 329 | struct drm_local_map *map = vma->vm_private_data; |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 330 | struct drm_file *priv = vma->vm_file->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 331 | struct drm_device *dev = priv->minor->dev; |
Dave Airlie | 5591051 | 2007-07-11 16:53:40 +1000 | [diff] [blame] | 332 | struct drm_sg_mem *entry = dev->sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | unsigned long offset; |
| 334 | unsigned long map_offset; |
| 335 | unsigned long page_offset; |
| 336 | struct page *page; |
| 337 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 338 | if (!entry) |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 339 | return VM_FAULT_SIGBUS; /* Error */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 340 | if (!entry->pagelist) |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 341 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 343 | offset = (unsigned long)vmf->virtual_address - vma->vm_start; |
Dave Airlie | d1f2b55 | 2005-08-05 22:11:22 +1000 | [diff] [blame] | 344 | map_offset = map->offset - (unsigned long)dev->sg->virtual; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
| 346 | page = entry->pagelist[page_offset]; |
| 347 | get_page(page); |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 348 | vmf->page = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 350 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | } |
| 352 | |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 353 | static int drm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 354 | { |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 355 | return drm_do_vm_fault(vma, vmf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 358 | static int drm_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 359 | { |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 360 | return drm_do_vm_shm_fault(vma, vmf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | } |
| 362 | |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 363 | static int drm_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 364 | { |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 365 | return drm_do_vm_dma_fault(vma, vmf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | } |
| 367 | |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 368 | static int drm_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 369 | { |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 370 | return drm_do_vm_sg_fault(vma, vmf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | } |
| 372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | /** AGP virtual memory operations */ |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 374 | static const struct vm_operations_struct drm_vm_ops = { |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 375 | .fault = drm_vm_fault, |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 376 | .open = drm_vm_open, |
| 377 | .close = drm_vm_close, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | }; |
| 379 | |
| 380 | /** Shared virtual memory operations */ |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 381 | static const struct vm_operations_struct drm_vm_shm_ops = { |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 382 | .fault = drm_vm_shm_fault, |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 383 | .open = drm_vm_open, |
| 384 | .close = drm_vm_shm_close, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | }; |
| 386 | |
| 387 | /** DMA virtual memory operations */ |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 388 | static const struct vm_operations_struct drm_vm_dma_ops = { |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 389 | .fault = drm_vm_dma_fault, |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 390 | .open = drm_vm_open, |
| 391 | .close = drm_vm_close, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | }; |
| 393 | |
| 394 | /** Scatter-gather virtual memory operations */ |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 395 | static const struct vm_operations_struct drm_vm_sg_ops = { |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 396 | .fault = drm_vm_sg_fault, |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 397 | .open = drm_vm_open, |
| 398 | .close = drm_vm_close, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | }; |
| 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | /** |
| 402 | * \c open method for shared virtual memory. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 403 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | * \param vma virtual memory area. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 405 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | * Create a new drm_vma_entry structure as the \p vma private data entry and |
| 407 | * add it to drm_device::vmalist. |
| 408 | */ |
Rob Clark | b06d66b | 2012-05-01 11:04:51 -0500 | [diff] [blame] | 409 | void drm_vm_open_locked(struct drm_device *dev, |
| 410 | struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | { |
Dave Airlie | 8fc2fdf | 2007-07-11 16:21:47 +1000 | [diff] [blame] | 412 | struct drm_vma_entry *vma_entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
| 414 | DRM_DEBUG("0x%08lx,0x%08lx\n", |
| 415 | vma->vm_start, vma->vm_end - vma->vm_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 417 | vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | if (vma_entry) { |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 419 | vma_entry->vma = vma; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 420 | vma_entry->pid = current->pid; |
Dave Airlie | bd1b331 | 2007-05-26 05:01:51 +1000 | [diff] [blame] | 421 | list_add(&vma_entry->head, &dev->vmalist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | } |
| 423 | } |
Arnd Bergmann | d502899 | 2013-04-25 19:28:52 +0200 | [diff] [blame] | 424 | EXPORT_SYMBOL_GPL(drm_vm_open_locked); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | |
Thomas Hellstrom | d7d8aac | 2007-03-24 17:52:49 +1100 | [diff] [blame] | 426 | static void drm_vm_open(struct vm_area_struct *vma) |
| 427 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 428 | struct drm_file *priv = vma->vm_file->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 429 | struct drm_device *dev = priv->minor->dev; |
Thomas Hellstrom | d7d8aac | 2007-03-24 17:52:49 +1100 | [diff] [blame] | 430 | |
| 431 | mutex_lock(&dev->struct_mutex); |
Rob Clark | b06d66b | 2012-05-01 11:04:51 -0500 | [diff] [blame] | 432 | drm_vm_open_locked(dev, vma); |
Thomas Hellstrom | d7d8aac | 2007-03-24 17:52:49 +1100 | [diff] [blame] | 433 | mutex_unlock(&dev->struct_mutex); |
| 434 | } |
| 435 | |
Rob Clark | b06d66b | 2012-05-01 11:04:51 -0500 | [diff] [blame] | 436 | void drm_vm_close_locked(struct drm_device *dev, |
| 437 | struct vm_area_struct *vma) |
Chris Wilson | 31dfbc9 | 2010-09-27 21:28:30 +0100 | [diff] [blame] | 438 | { |
Chris Wilson | 31dfbc9 | 2010-09-27 21:28:30 +0100 | [diff] [blame] | 439 | struct drm_vma_entry *pt, *temp; |
| 440 | |
| 441 | DRM_DEBUG("0x%08lx,0x%08lx\n", |
| 442 | vma->vm_start, vma->vm_end - vma->vm_start); |
Chris Wilson | 31dfbc9 | 2010-09-27 21:28:30 +0100 | [diff] [blame] | 443 | |
| 444 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
| 445 | if (pt->vma == vma) { |
| 446 | list_del(&pt->head); |
| 447 | kfree(pt); |
| 448 | break; |
| 449 | } |
| 450 | } |
| 451 | } |
| 452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | /** |
| 454 | * \c close method for all virtual memory types. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 455 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | * \param vma virtual memory area. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 457 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | * Search the \p vma private data entry in drm_device::vmalist, unlink it, and |
| 459 | * free it. |
| 460 | */ |
Dave Airlie | c94f702 | 2005-07-07 21:03:38 +1000 | [diff] [blame] | 461 | static void drm_vm_close(struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 463 | struct drm_file *priv = vma->vm_file->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 464 | struct drm_device *dev = priv->minor->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 466 | mutex_lock(&dev->struct_mutex); |
Rob Clark | b06d66b | 2012-05-01 11:04:51 -0500 | [diff] [blame] | 467 | drm_vm_close_locked(dev, vma); |
Dave Airlie | 30e2fb1 | 2006-02-02 19:37:46 +1100 | [diff] [blame] | 468 | mutex_unlock(&dev->struct_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | /** |
| 472 | * mmap DMA memory. |
| 473 | * |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 474 | * \param file_priv DRM file private. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | * \param vma virtual memory area. |
| 476 | * \return zero on success or a negative number on failure. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 477 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | * Sets the virtual memory area operations structure to vm_dma_ops, the file |
| 479 | * pointer, and calls vm_open(). |
| 480 | */ |
Dave Airlie | c94f702 | 2005-07-07 21:03:38 +1000 | [diff] [blame] | 481 | static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 483 | struct drm_file *priv = filp->private_data; |
| 484 | struct drm_device *dev; |
Dave Airlie | cdd55a2 | 2007-07-11 16:32:08 +1000 | [diff] [blame] | 485 | struct drm_device_dma *dma; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 486 | unsigned long length = vma->vm_end - vma->vm_start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 488 | dev = priv->minor->dev; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 489 | dma = dev->dma; |
Thomas Hellstrom | 1545085 | 2007-02-08 16:14:05 +1100 | [diff] [blame] | 490 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
| 491 | vma->vm_start, vma->vm_end, vma->vm_pgoff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 493 | /* Length must match exact page count */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | return -EINVAL; |
| 496 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
George Sapountzis | 3417f33 | 2006-10-24 12:03:04 -0700 | [diff] [blame] | 498 | if (!capable(CAP_SYS_ADMIN) && |
| 499 | (dma->flags & _DRM_DMA_USE_PCI_RO)) { |
| 500 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); |
| 501 | #if defined(__i386__) || defined(__x86_64__) |
| 502 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; |
| 503 | #else |
| 504 | /* Ye gads this is ugly. With more thought |
| 505 | we could move this up higher and use |
| 506 | `protection_map' instead. */ |
| 507 | vma->vm_page_prot = |
| 508 | __pgprot(pte_val |
| 509 | (pte_wrprotect |
| 510 | (__pte(pgprot_val(vma->vm_page_prot))))); |
| 511 | #endif |
| 512 | } |
| 513 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 514 | vma->vm_ops = &drm_vm_dma_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
Konstantin Khlebnikov | 314e51b | 2012-10-08 16:29:02 -0700 | [diff] [blame] | 516 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
Rob Clark | b06d66b | 2012-05-01 11:04:51 -0500 | [diff] [blame] | 518 | drm_vm_open_locked(dev, vma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | return 0; |
| 520 | } |
| 521 | |
Daniel Vetter | cbc60ca | 2010-08-23 22:53:28 +0200 | [diff] [blame] | 522 | static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | { |
| 524 | #ifdef __alpha__ |
Jay Estabrook | 82ba3fe | 2011-06-09 18:18:39 -0400 | [diff] [blame] | 525 | return dev->hose->dense_mem_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | #else |
| 527 | return 0; |
| 528 | #endif |
| 529 | } |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | /** |
| 532 | * mmap DMA memory. |
| 533 | * |
Eric Anholt | 6c340ea | 2007-08-25 20:23:09 +1000 | [diff] [blame] | 534 | * \param file_priv DRM file private. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | * \param vma virtual memory area. |
| 536 | * \return zero on success or a negative number on failure. |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 537 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | * If the virtual memory area has no offset associated with it then it's a DMA |
| 539 | * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, |
| 540 | * checks that the restricted flag is not set, sets the virtual memory operations |
| 541 | * according to the mapping type and remaps the pages. Finally sets the file |
| 542 | * pointer and calls vm_open(). |
| 543 | */ |
Jesse Barnes | a2c0a97 | 2008-11-05 10:31:53 -0800 | [diff] [blame] | 544 | int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 546 | struct drm_file *priv = filp->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 547 | struct drm_device *dev = priv->minor->dev; |
Benjamin Herrenschmidt | f77d390 | 2009-02-02 16:55:46 +1100 | [diff] [blame] | 548 | struct drm_local_map *map = NULL; |
Benjamin Herrenschmidt | 41c2e75 | 2009-02-02 16:55:47 +1100 | [diff] [blame] | 549 | resource_size_t offset = 0; |
Dave Airlie | e0be428 | 2007-07-12 10:26:44 +1000 | [diff] [blame] | 550 | struct drm_hash_item *hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Thomas Hellstrom | 1545085 | 2007-02-08 16:14:05 +1100 | [diff] [blame] | 552 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
| 553 | vma->vm_start, vma->vm_end, vma->vm_pgoff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 555 | if (!priv->authenticated) |
| 556 | return -EACCES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
| 558 | /* We check for "dma". On Apple's UniNorth, it's valid to have |
| 559 | * the AGP mapped at physical address 0 |
| 560 | * --BenH. |
| 561 | */ |
Thomas Hellstrom | 1545085 | 2007-02-08 16:14:05 +1100 | [diff] [blame] | 562 | if (!vma->vm_pgoff |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | #if __OS_HAS_AGP |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 564 | && (!dev->agp |
| 565 | || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | #endif |
| 567 | ) |
| 568 | return drm_mmap_dma(filp, vma); |
| 569 | |
Thomas Hellstrom | 1545085 | 2007-02-08 16:14:05 +1100 | [diff] [blame] | 570 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { |
Thomas Hellstrom | 8d153f7 | 2006-08-07 22:36:47 +1000 | [diff] [blame] | 571 | DRM_ERROR("Could not find map\n"); |
| 572 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
| 574 | |
Dave Airlie | 5591051 | 2007-07-11 16:53:40 +1000 | [diff] [blame] | 575 | map = drm_hash_entry(hash, struct drm_map_list, hash)->map; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 576 | if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | return -EPERM; |
| 578 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 579 | /* Check for valid size. */ |
Dave Airlie | 54ba2f7 | 2007-02-10 12:07:47 +1100 | [diff] [blame] | 580 | if (map->size < vma->vm_end - vma->vm_start) |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 581 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
| 583 | if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { |
| 584 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); |
| 585 | #if defined(__i386__) || defined(__x86_64__) |
| 586 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; |
| 587 | #else |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 588 | /* Ye gads this is ugly. With more thought |
| 589 | we could move this up higher and use |
| 590 | `protection_map' instead. */ |
| 591 | vma->vm_page_prot = |
| 592 | __pgprot(pte_val |
| 593 | (pte_wrprotect |
| 594 | (__pte(pgprot_val(vma->vm_page_prot))))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | #endif |
| 596 | } |
| 597 | |
| 598 | switch (map->type) { |
Jordan Crouse | 4b7fb9b | 2010-05-27 13:40:26 -0600 | [diff] [blame] | 599 | #if !defined(__arm__) |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 600 | case _DRM_AGP: |
Daniel Vetter | d990675 | 2013-12-11 11:34:35 +0100 | [diff] [blame] | 601 | if (dev->agp && dev->agp->cant_use_aperture) { |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 602 | /* |
| 603 | * On some platforms we can't talk to bus dma address from the CPU, so for |
| 604 | * memory of type DRM_AGP, we'll deal with sorting out the real physical |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 605 | * pages and mappings in fault() |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 606 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | #if defined(__powerpc__) |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 608 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | #endif |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 610 | vma->vm_ops = &drm_vm_ops; |
| 611 | break; |
| 612 | } |
| 613 | /* fall through to _DRM_FRAME_BUFFER... */ |
Jordan Crouse | 4b7fb9b | 2010-05-27 13:40:26 -0600 | [diff] [blame] | 614 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | case _DRM_FRAME_BUFFER: |
| 616 | case _DRM_REGISTERS: |
Daniel Vetter | cbc60ca | 2010-08-23 22:53:28 +0200 | [diff] [blame] | 617 | offset = drm_core_get_reg_ofs(dev); |
Andy Lutomirski | ff47eaf | 2013-05-13 23:58:42 +0000 | [diff] [blame] | 618 | vma->vm_page_prot = drm_io_prot(map, vma); |
Dave Airlie | 9e9c132 | 2007-03-24 17:57:54 +1100 | [diff] [blame] | 619 | if (io_remap_pfn_range(vma, vma->vm_start, |
| 620 | (map->offset + offset) >> PAGE_SHIFT, |
| 621 | vma->vm_end - vma->vm_start, |
| 622 | vma->vm_page_prot)) |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 623 | return -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," |
Benjamin Herrenschmidt | 41c2e75 | 2009-02-02 16:55:47 +1100 | [diff] [blame] | 625 | " offset = 0x%llx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | map->type, |
Benjamin Herrenschmidt | 41c2e75 | 2009-02-02 16:55:47 +1100 | [diff] [blame] | 627 | vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset)); |
Jordan Crouse | 4b7fb9b | 2010-05-27 13:40:26 -0600 | [diff] [blame] | 628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | vma->vm_ops = &drm_vm_ops; |
| 630 | break; |
Dave Airlie | 2d0f9ea | 2005-07-10 14:34:13 +1000 | [diff] [blame] | 631 | case _DRM_CONSISTENT: |
Hugh Dickins | 3831587 | 2007-03-24 17:55:16 +1100 | [diff] [blame] | 632 | /* Consistent memory is really like shared memory. But |
Nick Piggin | ca0b07d | 2008-02-07 16:20:50 +1000 | [diff] [blame] | 633 | * it's allocated in a different way, so avoid fault */ |
Hugh Dickins | 3831587 | 2007-03-24 17:55:16 +1100 | [diff] [blame] | 634 | if (remap_pfn_range(vma, vma->vm_start, |
| 635 | page_to_pfn(virt_to_page(map->handle)), |
| 636 | vma->vm_end - vma->vm_start, vma->vm_page_prot)) |
| 637 | return -EAGAIN; |
Benjamin Herrenschmidt | 6876b3b | 2008-03-28 14:23:07 -0700 | [diff] [blame] | 638 | vma->vm_page_prot = drm_dma_prot(map->type, vma); |
Hugh Dickins | 3831587 | 2007-03-24 17:55:16 +1100 | [diff] [blame] | 639 | /* fall through to _DRM_SHM */ |
| 640 | case _DRM_SHM: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | vma->vm_ops = &drm_vm_shm_ops; |
| 642 | vma->vm_private_data = (void *)map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | break; |
| 644 | case _DRM_SCATTER_GATHER: |
| 645 | vma->vm_ops = &drm_vm_sg_ops; |
| 646 | vma->vm_private_data = (void *)map; |
Benjamin Herrenschmidt | 5ff6461 | 2008-04-20 10:26:25 +1000 | [diff] [blame] | 647 | vma->vm_page_prot = drm_dma_prot(map->type, vma); |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 648 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | default: |
| 650 | return -EINVAL; /* This should never happen. */ |
| 651 | } |
Konstantin Khlebnikov | 314e51b | 2012-10-08 16:29:02 -0700 | [diff] [blame] | 652 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | |
Rob Clark | b06d66b | 2012-05-01 11:04:51 -0500 | [diff] [blame] | 654 | drm_vm_open_locked(dev, vma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | return 0; |
| 656 | } |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 657 | |
Thomas Hellstrom | d7d8aac | 2007-03-24 17:52:49 +1100 | [diff] [blame] | 658 | int drm_mmap(struct file *filp, struct vm_area_struct *vma) |
| 659 | { |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 660 | struct drm_file *priv = filp->private_data; |
Dave Airlie | 2c14f28 | 2008-04-21 16:47:32 +1000 | [diff] [blame] | 661 | struct drm_device *dev = priv->minor->dev; |
Thomas Hellstrom | d7d8aac | 2007-03-24 17:52:49 +1100 | [diff] [blame] | 662 | int ret; |
| 663 | |
Dave Airlie | 2c07a21 | 2012-02-20 14:18:07 +0000 | [diff] [blame] | 664 | if (drm_device_is_unplugged(dev)) |
| 665 | return -ENODEV; |
| 666 | |
Thomas Hellstrom | d7d8aac | 2007-03-24 17:52:49 +1100 | [diff] [blame] | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | EXPORT_SYMBOL(drm_mmap); |
David Herrmann | 03decbe | 2014-08-29 12:12:29 +0200 | [diff] [blame] | 674 | |
| 675 | void drm_legacy_vma_flush(struct drm_device *dev) |
| 676 | { |
| 677 | struct drm_vma_entry *vma, *vma_temp; |
| 678 | |
| 679 | /* Clear vma list (only needed for legacy drivers) */ |
| 680 | list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { |
| 681 | list_del(&vma->head); |
| 682 | kfree(vma); |
| 683 | } |
| 684 | } |
| 685 | |
David Herrmann | 03decbe | 2014-08-29 12:12:29 +0200 | [diff] [blame] | 686 | int drm_vma_info(struct seq_file *m, void *data) |
| 687 | { |
| 688 | struct drm_info_node *node = (struct drm_info_node *) m->private; |
| 689 | struct drm_device *dev = node->minor->dev; |
| 690 | struct drm_vma_entry *pt; |
| 691 | struct vm_area_struct *vma; |
| 692 | unsigned long vma_count = 0; |
| 693 | #if defined(__i386__) |
| 694 | unsigned int pgprot; |
| 695 | #endif |
| 696 | |
| 697 | mutex_lock(&dev->struct_mutex); |
| 698 | list_for_each_entry(pt, &dev->vmalist, head) |
| 699 | vma_count++; |
| 700 | |
| 701 | seq_printf(m, "vma use count: %lu, high_memory = %pK, 0x%pK\n", |
| 702 | vma_count, high_memory, |
| 703 | (void *)(unsigned long)virt_to_phys(high_memory)); |
| 704 | |
| 705 | list_for_each_entry(pt, &dev->vmalist, head) { |
| 706 | vma = pt->vma; |
| 707 | if (!vma) |
| 708 | continue; |
| 709 | seq_printf(m, |
| 710 | "\n%5d 0x%pK-0x%pK %c%c%c%c%c%c 0x%08lx000", |
| 711 | pt->pid, |
| 712 | (void *)vma->vm_start, (void *)vma->vm_end, |
| 713 | vma->vm_flags & VM_READ ? 'r' : '-', |
| 714 | vma->vm_flags & VM_WRITE ? 'w' : '-', |
| 715 | vma->vm_flags & VM_EXEC ? 'x' : '-', |
| 716 | vma->vm_flags & VM_MAYSHARE ? 's' : 'p', |
| 717 | vma->vm_flags & VM_LOCKED ? 'l' : '-', |
| 718 | vma->vm_flags & VM_IO ? 'i' : '-', |
| 719 | vma->vm_pgoff); |
| 720 | |
| 721 | #if defined(__i386__) |
| 722 | pgprot = pgprot_val(vma->vm_page_prot); |
| 723 | seq_printf(m, " %c%c%c%c%c%c%c%c%c", |
| 724 | pgprot & _PAGE_PRESENT ? 'p' : '-', |
| 725 | pgprot & _PAGE_RW ? 'w' : 'r', |
| 726 | pgprot & _PAGE_USER ? 'u' : 's', |
| 727 | pgprot & _PAGE_PWT ? 't' : 'b', |
| 728 | pgprot & _PAGE_PCD ? 'u' : 'c', |
| 729 | pgprot & _PAGE_ACCESSED ? 'a' : '-', |
| 730 | pgprot & _PAGE_DIRTY ? 'd' : '-', |
| 731 | pgprot & _PAGE_PSE ? 'm' : 'k', |
| 732 | pgprot & _PAGE_GLOBAL ? 'g' : 'l'); |
| 733 | #endif |
| 734 | seq_printf(m, "\n"); |
| 735 | } |
| 736 | mutex_unlock(&dev->struct_mutex); |
| 737 | return 0; |
| 738 | } |