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/slab.h> 34 #include <linux/pagemap.h> 35 #include <linux/miscdevice.h> 36 #include <linux/pm.h> 37 #include <linux/agp_backend.h> 38 #include <linux/agpgart.h> 39 #include <linux/vmalloc.h> 40 #include <asm/io.h> 41 #include "agp.h" 42 43 /* Due to XFree86 brain-damage, we can't go to 1.0 until they 44 * fix some real stupidity. It's only by chance we can bump 45 * past 0.99 at all due to some boolean logic error. */ 46 #define AGPGART_VERSION_MAJOR 0 47 #define AGPGART_VERSION_MINOR 103 48 static const struct agp_version agp_current_version = 49 { 50 .major = AGPGART_VERSION_MAJOR, 51 .minor = AGPGART_VERSION_MINOR, 52 }; 53 54 struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) = 55 &agp_generic_find_bridge; 56 57 struct agp_bridge_data *agp_bridge; 58 LIST_HEAD(agp_bridges); 59 EXPORT_SYMBOL(agp_bridge); 60 EXPORT_SYMBOL(agp_bridges); 61 EXPORT_SYMBOL(agp_find_bridge); 62 63 /** 64 * agp_backend_acquire - attempt to acquire an agp backend. 65 * 66 */ 67 struct agp_bridge_data *agp_backend_acquire(struct pci_dev *pdev) 68 { 69 struct agp_bridge_data *bridge; 70 71 bridge = agp_find_bridge(pdev); 72 73 if (!bridge) 74 return NULL; 75 76 if (atomic_read(&bridge->agp_in_use)) 77 return NULL; 78 atomic_inc(&bridge->agp_in_use); 79 return bridge; 80 } 81 EXPORT_SYMBOL(agp_backend_acquire); 82 83 84 /** 85 * agp_backend_release - release the lock on the agp backend. 86 * 87 * The caller must insure that the graphics aperture translation table 88 * is read for use by another entity. 89 * 90 * (Ensure that all memory it bound is unbound.) 91 */ 92 void agp_backend_release(struct agp_bridge_data *bridge) 93 { 94 95 if (bridge) 96 atomic_dec(&bridge->agp_in_use); 97 } 98 EXPORT_SYMBOL(agp_backend_release); 99 100 101 static const struct { int mem, agp; } maxes_table[] = { 102 {0, 0}, 103 {32, 4}, 104 {64, 28}, 105 {128, 96}, 106 {256, 204}, 107 {512, 440}, 108 {1024, 942}, 109 {2048, 1920}, 110 {4096, 3932} 111 }; 112 113 static int agp_find_max(void) 114 { 115 long memory, index, result; 116 117 #if PAGE_SHIFT < 20 118 memory = totalram_pages() >> (20 - PAGE_SHIFT); 119 #else 120 memory = totalram_pages() << (PAGE_SHIFT - 20); 121 #endif 122 index = 1; 123 124 while ((memory > maxes_table[index].mem) && (index < 8)) 125 index++; 126 127 result = maxes_table[index - 1].agp + 128 ( (memory - maxes_table[index - 1].mem) * 129 (maxes_table[index].agp - maxes_table[index - 1].agp)) / 130 (maxes_table[index].mem - maxes_table[index - 1].mem); 131 132 result = result << (20 - PAGE_SHIFT); 133 return result; 134 } 135 136 137 static int agp_backend_initialize(struct agp_bridge_data *bridge) 138 { 139 int size_value, rc, got_gatt=0, got_keylist=0; 140 141 bridge->max_memory_agp = agp_find_max(); 142 bridge->version = &agp_current_version; 143 144 if (bridge->driver->needs_scratch_page) { 145 struct page *page = bridge->driver->agp_alloc_page(bridge); 146 147 if (!page) { 148 dev_err(&bridge->dev->dev, 149 "can't get memory for scratch page\n"); 150 return -ENOMEM; 151 } 152 153 bridge->scratch_page_page = page; 154 bridge->scratch_page_dma = page_to_phys(page); 155 156 bridge->scratch_page = bridge->driver->mask_memory(bridge, 157 bridge->scratch_page_dma, 0); 158 } 159 160 size_value = bridge->driver->fetch_size(); 161 if (size_value == 0) { 162 dev_err(&bridge->dev->dev, "can't determine aperture size\n"); 163 rc = -EINVAL; 164 goto err_out; 165 } 166 if (bridge->driver->create_gatt_table(bridge)) { 167 dev_err(&bridge->dev->dev, 168 "can't get memory for graphics translation table\n"); 169 rc = -ENOMEM; 170 goto err_out; 171 } 172 got_gatt = 1; 173 174 bridge->key_list = vzalloc(PAGE_SIZE * 4); 175 if (bridge->key_list == NULL) { 176 dev_err(&bridge->dev->dev, 177 "can't allocate memory for key lists\n"); 178 rc = -ENOMEM; 179 goto err_out; 180 } 181 got_keylist = 1; 182 183 /* FIXME vmalloc'd memory not guaranteed contiguous */ 184 185 if (bridge->driver->configure()) { 186 dev_err(&bridge->dev->dev, "error configuring host chipset\n"); 187 rc = -EINVAL; 188 goto err_out; 189 } 190 INIT_LIST_HEAD(&bridge->mapped_list); 191 spin_lock_init(&bridge->mapped_lock); 192 193 return 0; 194 195 err_out: 196 if (bridge->driver->needs_scratch_page) { 197 struct page *page = bridge->scratch_page_page; 198 199 bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP); 200 bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE); 201 } 202 if (got_gatt) 203 bridge->driver->free_gatt_table(bridge); 204 if (got_keylist) { 205 vfree(bridge->key_list); 206 bridge->key_list = NULL; 207 } 208 return rc; 209 } 210 211 /* cannot be __exit b/c as it could be called from __init code */ 212 static void agp_backend_cleanup(struct agp_bridge_data *bridge) 213 { 214 if (bridge->driver->cleanup) 215 bridge->driver->cleanup(); 216 if (bridge->driver->free_gatt_table) 217 bridge->driver->free_gatt_table(bridge); 218 219 vfree(bridge->key_list); 220 bridge->key_list = NULL; 221 222 if (bridge->driver->agp_destroy_page && 223 bridge->driver->needs_scratch_page) { 224 struct page *page = bridge->scratch_page_page; 225 226 bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP); 227 bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE); 228 } 229 } 230 231 /* When we remove the global variable agp_bridge from all drivers 232 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated 233 */ 234 235 struct agp_bridge_data *agp_alloc_bridge(void) 236 { 237 struct agp_bridge_data *bridge; 238 239 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); 240 if (!bridge) 241 return NULL; 242 243 atomic_set(&bridge->agp_in_use, 0); 244 atomic_set(&bridge->current_memory_agp, 0); 245 246 if (list_empty(&agp_bridges)) 247 agp_bridge = bridge; 248 249 return bridge; 250 } 251 EXPORT_SYMBOL(agp_alloc_bridge); 252 253 254 void agp_put_bridge(struct agp_bridge_data *bridge) 255 { 256 kfree(bridge); 257 258 if (list_empty(&agp_bridges)) 259 agp_bridge = NULL; 260 } 261 EXPORT_SYMBOL(agp_put_bridge); 262 263 264 int agp_add_bridge(struct agp_bridge_data *bridge) 265 { 266 int error; 267 268 if (agp_off) { 269 error = -ENODEV; 270 goto err_put_bridge; 271 } 272 273 if (!bridge->dev) { 274 printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n"); 275 error = -EINVAL; 276 goto err_put_bridge; 277 } 278 279 /* Grab reference on the chipset driver. */ 280 if (!try_module_get(bridge->driver->owner)) { 281 dev_info(&bridge->dev->dev, "can't lock chipset driver\n"); 282 error = -EINVAL; 283 goto err_put_bridge; 284 } 285 286 error = agp_backend_initialize(bridge); 287 if (error) { 288 dev_info(&bridge->dev->dev, 289 "agp_backend_initialize() failed\n"); 290 goto err_out; 291 } 292 293 if (list_empty(&agp_bridges)) { 294 error = agp_frontend_initialize(); 295 if (error) { 296 dev_info(&bridge->dev->dev, 297 "agp_frontend_initialize() failed\n"); 298 goto frontend_err; 299 } 300 301 dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n", 302 bridge->driver->fetch_size(), bridge->gart_bus_addr); 303 304 } 305 306 list_add(&bridge->list, &agp_bridges); 307 return 0; 308 309 frontend_err: 310 agp_backend_cleanup(bridge); 311 err_out: 312 module_put(bridge->driver->owner); 313 err_put_bridge: 314 agp_put_bridge(bridge); 315 return error; 316 } 317 EXPORT_SYMBOL_GPL(agp_add_bridge); 318 319 320 void agp_remove_bridge(struct agp_bridge_data *bridge) 321 { 322 agp_backend_cleanup(bridge); 323 list_del(&bridge->list); 324 if (list_empty(&agp_bridges)) 325 agp_frontend_cleanup(); 326 module_put(bridge->driver->owner); 327 } 328 EXPORT_SYMBOL_GPL(agp_remove_bridge); 329 330 int agp_off; 331 int agp_try_unsupported_boot; 332 EXPORT_SYMBOL(agp_off); 333 EXPORT_SYMBOL(agp_try_unsupported_boot); 334 335 static int __init agp_init(void) 336 { 337 if (!agp_off) 338 printk(KERN_INFO "Linux agpgart interface v%d.%d\n", 339 AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR); 340 return 0; 341 } 342 343 static void __exit agp_exit(void) 344 { 345 } 346 347 #ifndef MODULE 348 static __init int agp_setup(char *s) 349 { 350 if (!strcmp(s,"off")) 351 agp_off = 1; 352 if (!strcmp(s,"try_unsupported")) 353 agp_try_unsupported_boot = 1; 354 return 1; 355 } 356 __setup("agp=", agp_setup); 357 #endif 358 359 MODULE_AUTHOR("Dave Jones, Jeff Hartmann"); 360 MODULE_DESCRIPTION("AGP GART driver"); 361 MODULE_LICENSE("GPL and additional rights"); 362 MODULE_ALIAS_MISCDEV(AGPGART_MINOR); 363 364 module_init(agp_init); 365 module_exit(agp_exit); 366 367