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_scatter.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/vmalloc.h> |
| 35 | #include "drmP.h" |
| 36 | |
| 37 | #define DEBUG_SCATTER 0 |
| 38 | |
Dave Airlie | 5591051 | 2007-07-11 16:53:40 +1000 | [diff] [blame] | 39 | void drm_sg_cleanup(struct drm_sg_mem * entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | { |
| 41 | struct page *page; |
| 42 | int i; |
| 43 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 44 | for (i = 0; i < entry->pages; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | page = entry->pagelist[i]; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 46 | if (page) |
| 47 | ClearPageReserved(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | } |
| 49 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 50 | vfree(entry->virtual); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 52 | drm_free(entry->busaddr, |
| 53 | entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES); |
| 54 | drm_free(entry->pagelist, |
| 55 | entry->pages * sizeof(*entry->pagelist), DRM_MEM_PAGES); |
| 56 | drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | } |
| 58 | |
Dave Airlie | d1f2b55 | 2005-08-05 22:11:22 +1000 | [diff] [blame] | 59 | #ifdef _LP64 |
| 60 | # define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1))) |
| 61 | #else |
| 62 | # define ScatterHandle(x) (unsigned int)(x) |
| 63 | #endif |
| 64 | |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame^] | 65 | int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { |
Dave Airlie | 5591051 | 2007-07-11 16:53:40 +1000 | [diff] [blame] | 67 | struct drm_sg_mem *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | unsigned long pages, i, j; |
| 69 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 70 | DRM_DEBUG("%s\n", __FUNCTION__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | if (!drm_core_check_feature(dev, DRIVER_SG)) |
| 73 | return -EINVAL; |
| 74 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 75 | if (dev->sg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | return -EINVAL; |
| 77 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 78 | entry = drm_alloc(sizeof(*entry), DRM_MEM_SGLISTS); |
| 79 | if (!entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | return -ENOMEM; |
| 81 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 82 | memset(entry, 0, sizeof(*entry)); |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame^] | 83 | pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE; |
| 84 | DRM_DEBUG("sg size=%ld pages=%ld\n", request->size, pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | entry->pages = pages; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 87 | entry->pagelist = drm_alloc(pages * sizeof(*entry->pagelist), |
| 88 | DRM_MEM_PAGES); |
| 89 | if (!entry->pagelist) { |
| 90 | drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | return -ENOMEM; |
| 92 | } |
| 93 | |
| 94 | memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist)); |
| 95 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 96 | entry->busaddr = drm_alloc(pages * sizeof(*entry->busaddr), |
| 97 | DRM_MEM_PAGES); |
| 98 | if (!entry->busaddr) { |
| 99 | drm_free(entry->pagelist, |
| 100 | entry->pages * sizeof(*entry->pagelist), |
| 101 | DRM_MEM_PAGES); |
| 102 | drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | return -ENOMEM; |
| 104 | } |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 105 | memset((void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 107 | entry->virtual = vmalloc_32(pages << PAGE_SHIFT); |
| 108 | if (!entry->virtual) { |
| 109 | drm_free(entry->busaddr, |
| 110 | entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES); |
| 111 | drm_free(entry->pagelist, |
| 112 | entry->pages * sizeof(*entry->pagelist), |
| 113 | DRM_MEM_PAGES); |
| 114 | drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | return -ENOMEM; |
| 116 | } |
| 117 | |
| 118 | /* This also forces the mapping of COW pages, so our page list |
| 119 | * will be valid. Please don't remove it... |
| 120 | */ |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 121 | memset(entry->virtual, 0, pages << PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
Dave Airlie | d1f2b55 | 2005-08-05 22:11:22 +1000 | [diff] [blame] | 123 | entry->handle = ScatterHandle((unsigned long)entry->virtual); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 125 | DRM_DEBUG("sg alloc handle = %08lx\n", entry->handle); |
| 126 | DRM_DEBUG("sg alloc virtual = %p\n", entry->virtual); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 128 | for (i = (unsigned long)entry->virtual, j = 0; j < pages; |
| 129 | i += PAGE_SIZE, j++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | entry->pagelist[j] = vmalloc_to_page((void *)i); |
| 131 | if (!entry->pagelist[j]) |
| 132 | goto failed; |
| 133 | SetPageReserved(entry->pagelist[j]); |
| 134 | } |
| 135 | |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame^] | 136 | request->handle = entry->handle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
| 138 | dev->sg = entry; |
| 139 | |
| 140 | #if DEBUG_SCATTER |
| 141 | /* Verify that each page points to its virtual address, and vice |
| 142 | * versa. |
| 143 | */ |
| 144 | { |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 145 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 147 | for (i = 0; i < pages; i++) { |
| 148 | unsigned long *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 150 | tmp = page_address(entry->pagelist[i]); |
| 151 | for (j = 0; |
| 152 | j < PAGE_SIZE / sizeof(unsigned long); |
| 153 | j++, tmp++) { |
| 154 | *tmp = 0xcafebabe; |
| 155 | } |
| 156 | tmp = (unsigned long *)((u8 *) entry->virtual + |
| 157 | (PAGE_SIZE * i)); |
| 158 | for (j = 0; |
| 159 | j < PAGE_SIZE / sizeof(unsigned long); |
| 160 | j++, tmp++) { |
| 161 | if (*tmp != 0xcafebabe && error == 0) { |
| 162 | error = 1; |
| 163 | DRM_ERROR("Scatter allocation error, " |
| 164 | "pagelist does not match " |
| 165 | "virtual mapping\n"); |
| 166 | } |
| 167 | } |
| 168 | tmp = page_address(entry->pagelist[i]); |
| 169 | for (j = 0; |
| 170 | j < PAGE_SIZE / sizeof(unsigned long); |
| 171 | j++, tmp++) { |
| 172 | *tmp = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | } |
| 174 | } |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 175 | if (error == 0) |
| 176 | DRM_ERROR("Scatter allocation matches pagelist\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
| 178 | #endif |
| 179 | |
| 180 | return 0; |
| 181 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 182 | failed: |
| 183 | drm_sg_cleanup(entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | return -ENOMEM; |
| 185 | } |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame^] | 186 | EXPORT_SYMBOL(drm_sg_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame^] | 188 | |
| 189 | int drm_sg_alloc_ioctl(struct drm_device *dev, void *data, |
| 190 | struct drm_file *file_priv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | { |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame^] | 192 | struct drm_scatter_gather *request = data; |
| 193 | |
| 194 | return drm_sg_alloc(dev, request); |
| 195 | |
| 196 | } |
| 197 | |
| 198 | int drm_sg_free(struct drm_device *dev, void *data, |
| 199 | struct drm_file *file_priv) |
| 200 | { |
| 201 | struct drm_scatter_gather *request = data; |
Dave Airlie | 5591051 | 2007-07-11 16:53:40 +1000 | [diff] [blame] | 202 | struct drm_sg_mem *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
| 204 | if (!drm_core_check_feature(dev, DRIVER_SG)) |
| 205 | return -EINVAL; |
| 206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | entry = dev->sg; |
| 208 | dev->sg = NULL; |
| 209 | |
Eric Anholt | c153f45 | 2007-09-03 12:06:45 +1000 | [diff] [blame^] | 210 | if (!entry || entry->handle != request->handle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | return -EINVAL; |
| 212 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 213 | DRM_DEBUG("sg free virtual = %p\n", entry->virtual); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 215 | drm_sg_cleanup(entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
| 217 | return 0; |
| 218 | } |