Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * AGPGART driver backend routines. |
| 3 | * Copyright (C) 2004 Silicon Graphics, Inc. |
| 4 | * Copyright (C) 2002-2003 Dave Jones. |
| 5 | * Copyright (C) 1999 Jeff Hartmann. |
| 6 | * Copyright (C) 1999 Precision Insight, Inc. |
| 7 | * Copyright (C) 1999 Xi Graphics, Inc. |
| 8 | * |
| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 10 | * copy of this software and associated documentation files (the "Software"), |
| 11 | * to deal in the Software without restriction, including without limitation |
| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
| 14 | * Software is furnished to do so, subject to the following conditions: |
| 15 | * |
| 16 | * The above copyright notice and this permission notice shall be included |
| 17 | * in all copies or substantial portions of the Software. |
| 18 | * |
| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 22 | * JEFF HARTMANN, DAVE JONES, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM, |
| 23 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| 24 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE |
| 25 | * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 26 | * |
| 27 | * TODO: |
| 28 | * - Allocate more than order 0 pages to avoid too much linear map splitting. |
| 29 | */ |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/pci.h> |
| 32 | #include <linux/init.h> |
| 33 | #include <linux/pagemap.h> |
| 34 | #include <linux/miscdevice.h> |
| 35 | #include <linux/pm.h> |
| 36 | #include <linux/agp_backend.h> |
| 37 | #include <linux/agpgart.h> |
| 38 | #include <linux/vmalloc.h> |
| 39 | #include <asm/io.h> |
| 40 | #include "agp.h" |
| 41 | |
| 42 | /* Due to XFree86 brain-damage, we can't go to 1.0 until they |
| 43 | * fix some real stupidity. It's only by chance we can bump |
| 44 | * past 0.99 at all due to some boolean logic error. */ |
| 45 | #define AGPGART_VERSION_MAJOR 0 |
Thomas Hellstrom | a030ce4 | 2007-01-23 10:33:43 +0100 | [diff] [blame] | 46 | #define AGPGART_VERSION_MINOR 102 |
Dave Jones | e7745d4 | 2006-08-11 18:02:27 -0400 | [diff] [blame] | 47 | static const struct agp_version agp_current_version = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | { |
| 49 | .major = AGPGART_VERSION_MAJOR, |
| 50 | .minor = AGPGART_VERSION_MINOR, |
| 51 | }; |
| 52 | |
| 53 | struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) = |
| 54 | &agp_generic_find_bridge; |
| 55 | |
| 56 | struct agp_bridge_data *agp_bridge; |
| 57 | LIST_HEAD(agp_bridges); |
| 58 | EXPORT_SYMBOL(agp_bridge); |
| 59 | EXPORT_SYMBOL(agp_bridges); |
| 60 | EXPORT_SYMBOL(agp_find_bridge); |
| 61 | |
| 62 | /** |
| 63 | * agp_backend_acquire - attempt to acquire an agp backend. |
| 64 | * |
| 65 | */ |
| 66 | struct agp_bridge_data *agp_backend_acquire(struct pci_dev *pdev) |
| 67 | { |
| 68 | struct agp_bridge_data *bridge; |
| 69 | |
| 70 | bridge = agp_find_bridge(pdev); |
| 71 | |
| 72 | if (!bridge) |
| 73 | return NULL; |
| 74 | |
| 75 | if (atomic_read(&bridge->agp_in_use)) |
| 76 | return NULL; |
| 77 | atomic_inc(&bridge->agp_in_use); |
| 78 | return bridge; |
| 79 | } |
| 80 | EXPORT_SYMBOL(agp_backend_acquire); |
| 81 | |
| 82 | |
| 83 | /** |
| 84 | * agp_backend_release - release the lock on the agp backend. |
| 85 | * |
| 86 | * The caller must insure that the graphics aperture translation table |
| 87 | * is read for use by another entity. |
| 88 | * |
| 89 | * (Ensure that all memory it bound is unbound.) |
| 90 | */ |
| 91 | void agp_backend_release(struct agp_bridge_data *bridge) |
| 92 | { |
| 93 | |
| 94 | if (bridge) |
| 95 | atomic_dec(&bridge->agp_in_use); |
| 96 | } |
| 97 | EXPORT_SYMBOL(agp_backend_release); |
| 98 | |
| 99 | |
Dave Jones | 5e9ad06 | 2005-11-16 16:05:49 -0800 | [diff] [blame] | 100 | static const struct { int mem, agp; } maxes_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | {0, 0}, |
| 102 | {32, 4}, |
| 103 | {64, 28}, |
| 104 | {128, 96}, |
| 105 | {256, 204}, |
| 106 | {512, 440}, |
| 107 | {1024, 942}, |
| 108 | {2048, 1920}, |
| 109 | {4096, 3932} |
| 110 | }; |
| 111 | |
| 112 | static int agp_find_max(void) |
| 113 | { |
| 114 | long memory, index, result; |
| 115 | |
| 116 | #if PAGE_SHIFT < 20 |
| 117 | memory = num_physpages >> (20 - PAGE_SHIFT); |
| 118 | #else |
| 119 | memory = num_physpages << (PAGE_SHIFT - 20); |
| 120 | #endif |
| 121 | index = 1; |
| 122 | |
| 123 | while ((memory > maxes_table[index].mem) && (index < 8)) |
| 124 | index++; |
| 125 | |
| 126 | result = maxes_table[index - 1].agp + |
| 127 | ( (memory - maxes_table[index - 1].mem) * |
| 128 | (maxes_table[index].agp - maxes_table[index - 1].agp)) / |
| 129 | (maxes_table[index].mem - maxes_table[index - 1].mem); |
| 130 | |
| 131 | result = result << (20 - PAGE_SHIFT); |
| 132 | return result; |
| 133 | } |
| 134 | |
| 135 | |
| 136 | static int agp_backend_initialize(struct agp_bridge_data *bridge) |
| 137 | { |
| 138 | int size_value, rc, got_gatt=0, got_keylist=0; |
| 139 | |
| 140 | bridge->max_memory_agp = agp_find_max(); |
| 141 | bridge->version = &agp_current_version; |
| 142 | |
| 143 | if (bridge->driver->needs_scratch_page) { |
| 144 | void *addr = bridge->driver->agp_alloc_page(bridge); |
| 145 | |
| 146 | if (!addr) { |
| 147 | printk(KERN_ERR PFX "unable to get memory for scratch page.\n"); |
| 148 | return -ENOMEM; |
| 149 | } |
| 150 | |
Keir Fraser | 07eee78 | 2005-03-30 13:17:04 -0800 | [diff] [blame] | 151 | bridge->scratch_page_real = virt_to_gart(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | bridge->scratch_page = |
| 153 | bridge->driver->mask_memory(bridge, bridge->scratch_page_real, 0); |
| 154 | } |
| 155 | |
| 156 | size_value = bridge->driver->fetch_size(); |
| 157 | if (size_value == 0) { |
| 158 | printk(KERN_ERR PFX "unable to determine aperture size.\n"); |
| 159 | rc = -EINVAL; |
| 160 | goto err_out; |
| 161 | } |
| 162 | if (bridge->driver->create_gatt_table(bridge)) { |
| 163 | printk(KERN_ERR PFX |
| 164 | "unable to get memory for graphics translation table.\n"); |
| 165 | rc = -ENOMEM; |
| 166 | goto err_out; |
| 167 | } |
| 168 | got_gatt = 1; |
| 169 | |
| 170 | bridge->key_list = vmalloc(PAGE_SIZE * 4); |
| 171 | if (bridge->key_list == NULL) { |
| 172 | printk(KERN_ERR PFX "error allocating memory for key lists.\n"); |
| 173 | rc = -ENOMEM; |
| 174 | goto err_out; |
| 175 | } |
| 176 | got_keylist = 1; |
| 177 | |
| 178 | /* FIXME vmalloc'd memory not guaranteed contiguous */ |
| 179 | memset(bridge->key_list, 0, PAGE_SIZE * 4); |
| 180 | |
| 181 | if (bridge->driver->configure()) { |
| 182 | printk(KERN_ERR PFX "error configuring host chipset.\n"); |
| 183 | rc = -EINVAL; |
| 184 | goto err_out; |
| 185 | } |
| 186 | |
| 187 | return 0; |
| 188 | |
| 189 | err_out: |
Alan Hourihane | 88d5196 | 2005-11-06 23:35:34 -0800 | [diff] [blame] | 190 | if (bridge->driver->needs_scratch_page) { |
Dave Airlie | a2721e9 | 2007-10-15 10:19:16 +1000 | [diff] [blame] | 191 | bridge->driver->agp_destroy_page(gart_to_virt(bridge->scratch_page_real), |
| 192 | AGP_PAGE_DESTROY_UNMAP); |
Dave Airlie | a2721e9 | 2007-10-15 10:19:16 +1000 | [diff] [blame] | 193 | bridge->driver->agp_destroy_page(gart_to_virt(bridge->scratch_page_real), |
| 194 | AGP_PAGE_DESTROY_FREE); |
Alan Hourihane | 88d5196 | 2005-11-06 23:35:34 -0800 | [diff] [blame] | 195 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | if (got_gatt) |
| 197 | bridge->driver->free_gatt_table(bridge); |
| 198 | if (got_keylist) { |
| 199 | vfree(bridge->key_list); |
| 200 | bridge->key_list = NULL; |
| 201 | } |
| 202 | return rc; |
| 203 | } |
| 204 | |
| 205 | /* cannot be __exit b/c as it could be called from __init code */ |
| 206 | static void agp_backend_cleanup(struct agp_bridge_data *bridge) |
| 207 | { |
| 208 | if (bridge->driver->cleanup) |
| 209 | bridge->driver->cleanup(); |
| 210 | if (bridge->driver->free_gatt_table) |
| 211 | bridge->driver->free_gatt_table(bridge); |
Jesper Juhl | f9101210 | 2005-09-10 00:26:54 -0700 | [diff] [blame] | 212 | |
| 213 | vfree(bridge->key_list); |
| 214 | bridge->key_list = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
| 216 | if (bridge->driver->agp_destroy_page && |
Alan Hourihane | 88d5196 | 2005-11-06 23:35:34 -0800 | [diff] [blame] | 217 | bridge->driver->needs_scratch_page) { |
Dave Airlie | a2721e9 | 2007-10-15 10:19:16 +1000 | [diff] [blame] | 218 | bridge->driver->agp_destroy_page(gart_to_virt(bridge->scratch_page_real), |
| 219 | AGP_PAGE_DESTROY_UNMAP); |
Dave Airlie | a2721e9 | 2007-10-15 10:19:16 +1000 | [diff] [blame] | 220 | bridge->driver->agp_destroy_page(gart_to_virt(bridge->scratch_page_real), |
| 221 | AGP_PAGE_DESTROY_FREE); |
Alan Hourihane | 88d5196 | 2005-11-06 23:35:34 -0800 | [diff] [blame] | 222 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | /* When we remove the global variable agp_bridge from all drivers |
| 226 | * then agp_alloc_bridge and agp_generic_find_bridge need to be updated |
| 227 | */ |
| 228 | |
| 229 | struct agp_bridge_data *agp_alloc_bridge(void) |
| 230 | { |
Dave Jones | 0ea27d9 | 2005-10-20 15:12:16 -0700 | [diff] [blame] | 231 | struct agp_bridge_data *bridge; |
Dave Jones | 6a92a4e | 2006-02-28 00:54:25 -0500 | [diff] [blame] | 232 | |
Dave Jones | 0ea27d9 | 2005-10-20 15:12:16 -0700 | [diff] [blame] | 233 | bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | if (!bridge) |
| 235 | return NULL; |
| 236 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | atomic_set(&bridge->agp_in_use, 0); |
| 238 | atomic_set(&bridge->current_memory_agp, 0); |
| 239 | |
| 240 | if (list_empty(&agp_bridges)) |
| 241 | agp_bridge = bridge; |
| 242 | |
| 243 | return bridge; |
| 244 | } |
| 245 | EXPORT_SYMBOL(agp_alloc_bridge); |
| 246 | |
| 247 | |
| 248 | void agp_put_bridge(struct agp_bridge_data *bridge) |
| 249 | { |
| 250 | kfree(bridge); |
| 251 | |
| 252 | if (list_empty(&agp_bridges)) |
| 253 | agp_bridge = NULL; |
| 254 | } |
| 255 | EXPORT_SYMBOL(agp_put_bridge); |
| 256 | |
| 257 | |
| 258 | int agp_add_bridge(struct agp_bridge_data *bridge) |
| 259 | { |
| 260 | int error; |
| 261 | |
| 262 | if (agp_off) |
| 263 | return -ENODEV; |
| 264 | |
| 265 | if (!bridge->dev) { |
| 266 | printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n"); |
| 267 | return -EINVAL; |
| 268 | } |
| 269 | |
| 270 | /* Grab reference on the chipset driver. */ |
| 271 | if (!try_module_get(bridge->driver->owner)) { |
| 272 | printk (KERN_INFO PFX "Couldn't lock chipset driver.\n"); |
| 273 | return -EINVAL; |
| 274 | } |
| 275 | |
| 276 | error = agp_backend_initialize(bridge); |
| 277 | if (error) { |
| 278 | printk (KERN_INFO PFX "agp_backend_initialize() failed.\n"); |
| 279 | goto err_out; |
| 280 | } |
| 281 | |
| 282 | if (list_empty(&agp_bridges)) { |
| 283 | error = agp_frontend_initialize(); |
| 284 | if (error) { |
| 285 | printk (KERN_INFO PFX "agp_frontend_initialize() failed.\n"); |
| 286 | goto frontend_err; |
| 287 | } |
| 288 | |
| 289 | printk(KERN_INFO PFX "AGP aperture is %dM @ 0x%lx\n", |
| 290 | bridge->driver->fetch_size(), bridge->gart_bus_addr); |
| 291 | |
| 292 | } |
| 293 | |
| 294 | list_add(&bridge->list, &agp_bridges); |
| 295 | return 0; |
| 296 | |
| 297 | frontend_err: |
| 298 | agp_backend_cleanup(bridge); |
| 299 | err_out: |
| 300 | module_put(bridge->driver->owner); |
| 301 | agp_put_bridge(bridge); |
| 302 | return error; |
| 303 | } |
| 304 | EXPORT_SYMBOL_GPL(agp_add_bridge); |
| 305 | |
| 306 | |
| 307 | void agp_remove_bridge(struct agp_bridge_data *bridge) |
| 308 | { |
| 309 | agp_backend_cleanup(bridge); |
| 310 | list_del(&bridge->list); |
| 311 | if (list_empty(&agp_bridges)) |
| 312 | agp_frontend_cleanup(); |
| 313 | module_put(bridge->driver->owner); |
| 314 | } |
| 315 | EXPORT_SYMBOL_GPL(agp_remove_bridge); |
| 316 | |
| 317 | int agp_off; |
| 318 | int agp_try_unsupported_boot; |
| 319 | EXPORT_SYMBOL(agp_off); |
| 320 | EXPORT_SYMBOL(agp_try_unsupported_boot); |
| 321 | |
| 322 | static int __init agp_init(void) |
| 323 | { |
| 324 | if (!agp_off) |
Dave Jones | 70e8992 | 2007-07-09 20:23:50 -0400 | [diff] [blame] | 325 | printk(KERN_INFO "Linux agpgart interface v%d.%d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR); |
| 327 | return 0; |
| 328 | } |
| 329 | |
Adrian Bunk | 408b664 | 2005-05-01 08:59:29 -0700 | [diff] [blame] | 330 | static void __exit agp_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | { |
| 332 | } |
| 333 | |
| 334 | #ifndef MODULE |
| 335 | static __init int agp_setup(char *s) |
| 336 | { |
| 337 | if (!strcmp(s,"off")) |
| 338 | agp_off = 1; |
| 339 | if (!strcmp(s,"try_unsupported")) |
| 340 | agp_try_unsupported_boot = 1; |
| 341 | return 1; |
| 342 | } |
| 343 | __setup("agp=", agp_setup); |
| 344 | #endif |
| 345 | |
| 346 | MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>"); |
| 347 | MODULE_DESCRIPTION("AGP GART driver"); |
| 348 | MODULE_LICENSE("GPL and additional rights"); |
| 349 | MODULE_ALIAS_MISCDEV(AGPGART_MINOR); |
| 350 | |
| 351 | module_init(agp_init); |
| 352 | module_exit(agp_exit); |
| 353 | |