Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /** |
| 2 | * \file drm_scatter.h |
| 3 | * IOCTLs to manage scatter/gather memory |
| 4 | * |
| 5 | * \author Gareth Hughes <gareth@valinux.com> |
| 6 | */ |
| 7 | |
| 8 | /* |
| 9 | * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com |
| 10 | * |
| 11 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
| 12 | * All Rights Reserved. |
| 13 | * |
| 14 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 15 | * copy of this software and associated documentation files (the "Software"), |
| 16 | * to deal in the Software without restriction, including without limitation |
| 17 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 18 | * and/or sell copies of the Software, and to permit persons to whom the |
| 19 | * Software is furnished to do so, subject to the following conditions: |
| 20 | * |
| 21 | * The above copyright notice and this permission notice (including the next |
| 22 | * paragraph) shall be included in all copies or substantial portions of the |
| 23 | * Software. |
| 24 | * |
| 25 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 26 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 27 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 28 | * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 29 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 30 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 31 | * DEALINGS IN THE SOFTWARE. |
| 32 | */ |
| 33 | |
| 34 | #include <linux/config.h> |
| 35 | #include <linux/vmalloc.h> |
| 36 | #include "drmP.h" |
| 37 | |
| 38 | #define DEBUG_SCATTER 0 |
| 39 | |
| 40 | void drm_sg_cleanup( drm_sg_mem_t *entry ) |
| 41 | { |
| 42 | struct page *page; |
| 43 | int i; |
| 44 | |
| 45 | for ( i = 0 ; i < entry->pages ; i++ ) { |
| 46 | page = entry->pagelist[i]; |
| 47 | if ( page ) |
| 48 | ClearPageReserved( page ); |
| 49 | } |
| 50 | |
| 51 | vfree( entry->virtual ); |
| 52 | |
| 53 | drm_free( entry->busaddr, |
| 54 | entry->pages * sizeof(*entry->busaddr), |
| 55 | DRM_MEM_PAGES ); |
| 56 | drm_free( entry->pagelist, |
| 57 | entry->pages * sizeof(*entry->pagelist), |
| 58 | DRM_MEM_PAGES ); |
| 59 | drm_free( entry, |
| 60 | sizeof(*entry), |
| 61 | DRM_MEM_SGLISTS ); |
| 62 | } |
| 63 | |
Dave Airlie | d1f2b55 | 2005-08-05 22:11:22 +1000 | [diff] [blame] | 64 | #ifdef _LP64 |
| 65 | # define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1))) |
| 66 | #else |
| 67 | # define ScatterHandle(x) (unsigned int)(x) |
| 68 | #endif |
| 69 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | int drm_sg_alloc( struct inode *inode, struct file *filp, |
| 71 | unsigned int cmd, unsigned long arg ) |
| 72 | { |
| 73 | drm_file_t *priv = filp->private_data; |
| 74 | drm_device_t *dev = priv->head->dev; |
| 75 | drm_scatter_gather_t __user *argp = (void __user *)arg; |
| 76 | drm_scatter_gather_t request; |
| 77 | drm_sg_mem_t *entry; |
| 78 | unsigned long pages, i, j; |
| 79 | |
| 80 | DRM_DEBUG( "%s\n", __FUNCTION__ ); |
| 81 | |
| 82 | if (!drm_core_check_feature(dev, DRIVER_SG)) |
| 83 | return -EINVAL; |
| 84 | |
| 85 | if ( dev->sg ) |
| 86 | return -EINVAL; |
| 87 | |
| 88 | if ( copy_from_user( &request, argp, sizeof(request) ) ) |
| 89 | return -EFAULT; |
| 90 | |
| 91 | entry = drm_alloc( sizeof(*entry), DRM_MEM_SGLISTS ); |
| 92 | if ( !entry ) |
| 93 | return -ENOMEM; |
| 94 | |
| 95 | memset( entry, 0, sizeof(*entry) ); |
| 96 | |
| 97 | pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE; |
| 98 | DRM_DEBUG( "sg size=%ld pages=%ld\n", request.size, pages ); |
| 99 | |
| 100 | entry->pages = pages; |
| 101 | entry->pagelist = drm_alloc( pages * sizeof(*entry->pagelist), |
| 102 | DRM_MEM_PAGES ); |
| 103 | if ( !entry->pagelist ) { |
| 104 | drm_free( entry, sizeof(*entry), DRM_MEM_SGLISTS ); |
| 105 | return -ENOMEM; |
| 106 | } |
| 107 | |
| 108 | memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist)); |
| 109 | |
| 110 | entry->busaddr = drm_alloc( pages * sizeof(*entry->busaddr), |
| 111 | DRM_MEM_PAGES ); |
| 112 | if ( !entry->busaddr ) { |
| 113 | drm_free( entry->pagelist, |
| 114 | entry->pages * sizeof(*entry->pagelist), |
| 115 | DRM_MEM_PAGES ); |
| 116 | drm_free( entry, |
| 117 | sizeof(*entry), |
| 118 | DRM_MEM_SGLISTS ); |
| 119 | return -ENOMEM; |
| 120 | } |
| 121 | memset( (void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr) ); |
| 122 | |
| 123 | entry->virtual = vmalloc_32( pages << PAGE_SHIFT ); |
| 124 | if ( !entry->virtual ) { |
| 125 | drm_free( entry->busaddr, |
| 126 | entry->pages * sizeof(*entry->busaddr), |
| 127 | DRM_MEM_PAGES ); |
| 128 | drm_free( entry->pagelist, |
| 129 | entry->pages * sizeof(*entry->pagelist), |
| 130 | DRM_MEM_PAGES ); |
| 131 | drm_free( entry, |
| 132 | sizeof(*entry), |
| 133 | DRM_MEM_SGLISTS ); |
| 134 | return -ENOMEM; |
| 135 | } |
| 136 | |
| 137 | /* This also forces the mapping of COW pages, so our page list |
| 138 | * will be valid. Please don't remove it... |
| 139 | */ |
| 140 | memset( entry->virtual, 0, pages << PAGE_SHIFT ); |
| 141 | |
Dave Airlie | d1f2b55 | 2005-08-05 22:11:22 +1000 | [diff] [blame] | 142 | entry->handle = ScatterHandle((unsigned long)entry->virtual); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
| 144 | DRM_DEBUG( "sg alloc handle = %08lx\n", entry->handle ); |
| 145 | DRM_DEBUG( "sg alloc virtual = %p\n", entry->virtual ); |
| 146 | |
Dave Airlie | d1f2b55 | 2005-08-05 22:11:22 +1000 | [diff] [blame] | 147 | for (i = (unsigned long)entry->virtual, j = 0; j < pages; |
| 148 | i += PAGE_SIZE, j++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | entry->pagelist[j] = vmalloc_to_page((void *)i); |
| 150 | if (!entry->pagelist[j]) |
| 151 | goto failed; |
| 152 | SetPageReserved(entry->pagelist[j]); |
| 153 | } |
| 154 | |
| 155 | request.handle = entry->handle; |
| 156 | |
| 157 | if ( copy_to_user( argp, &request, sizeof(request) ) ) { |
| 158 | drm_sg_cleanup( entry ); |
| 159 | return -EFAULT; |
| 160 | } |
| 161 | |
| 162 | dev->sg = entry; |
| 163 | |
| 164 | #if DEBUG_SCATTER |
| 165 | /* Verify that each page points to its virtual address, and vice |
| 166 | * versa. |
| 167 | */ |
| 168 | { |
| 169 | int error = 0; |
| 170 | |
| 171 | for ( i = 0 ; i < pages ; i++ ) { |
| 172 | unsigned long *tmp; |
| 173 | |
| 174 | tmp = page_address( entry->pagelist[i] ); |
| 175 | for ( j = 0 ; |
| 176 | j < PAGE_SIZE / sizeof(unsigned long) ; |
| 177 | j++, tmp++ ) { |
| 178 | *tmp = 0xcafebabe; |
| 179 | } |
| 180 | tmp = (unsigned long *)((u8 *)entry->virtual + |
| 181 | (PAGE_SIZE * i)); |
| 182 | for( j = 0 ; |
| 183 | j < PAGE_SIZE / sizeof(unsigned long) ; |
| 184 | j++, tmp++ ) { |
| 185 | if ( *tmp != 0xcafebabe && error == 0 ) { |
| 186 | error = 1; |
| 187 | DRM_ERROR( "Scatter allocation error, " |
| 188 | "pagelist does not match " |
| 189 | "virtual mapping\n" ); |
| 190 | } |
| 191 | } |
| 192 | tmp = page_address( entry->pagelist[i] ); |
| 193 | for(j = 0 ; |
| 194 | j < PAGE_SIZE / sizeof(unsigned long) ; |
| 195 | j++, tmp++) { |
| 196 | *tmp = 0; |
| 197 | } |
| 198 | } |
| 199 | if (error == 0) |
| 200 | DRM_ERROR( "Scatter allocation matches pagelist\n" ); |
| 201 | } |
| 202 | #endif |
| 203 | |
| 204 | return 0; |
| 205 | |
| 206 | failed: |
| 207 | drm_sg_cleanup( entry ); |
| 208 | return -ENOMEM; |
| 209 | } |
| 210 | |
| 211 | int drm_sg_free( struct inode *inode, struct file *filp, |
| 212 | unsigned int cmd, unsigned long arg ) |
| 213 | { |
| 214 | drm_file_t *priv = filp->private_data; |
| 215 | drm_device_t *dev = priv->head->dev; |
| 216 | drm_scatter_gather_t request; |
| 217 | drm_sg_mem_t *entry; |
| 218 | |
| 219 | if (!drm_core_check_feature(dev, DRIVER_SG)) |
| 220 | return -EINVAL; |
| 221 | |
| 222 | if ( copy_from_user( &request, |
| 223 | (drm_scatter_gather_t __user *)arg, |
| 224 | sizeof(request) ) ) |
| 225 | return -EFAULT; |
| 226 | |
| 227 | entry = dev->sg; |
| 228 | dev->sg = NULL; |
| 229 | |
| 230 | if ( !entry || entry->handle != request.handle ) |
| 231 | return -EINVAL; |
| 232 | |
| 233 | DRM_DEBUG( "sg free virtual = %p\n", entry->virtual ); |
| 234 | |
| 235 | drm_sg_cleanup( entry ); |
| 236 | |
| 237 | return 0; |
| 238 | } |