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 48static const struct agp_version agp_current_version = 49{ 50 .major = AGPGART_VERSION_MAJOR, 51 .minor = AGPGART_VERSION_MINOR, 52}; 53 54struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) = 55 &agp_generic_find_bridge; 56 57struct agp_bridge_data *agp_bridge; 58LIST_HEAD(agp_bridges); 59EXPORT_SYMBOL(agp_bridge); 60EXPORT_SYMBOL(agp_bridges); 61EXPORT_SYMBOL(agp_find_bridge); 62 63/** 64 * agp_backend_acquire - attempt to acquire an agp backend. 65 * 66 */ 67struct 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} 81EXPORT_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 */ 92void agp_backend_release(struct agp_bridge_data *bridge) 93{ 94 95 if (bridge) 96 atomic_dec(&bridge->agp_in_use); 97} 98EXPORT_SYMBOL(agp_backend_release); 99 100 101static 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 113static 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 137static 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 if (bridge->driver->agp_map_page) { 155 if (bridge->driver->agp_map_page(page, 156 &bridge->scratch_page_dma)) { 157 dev_err(&bridge->dev->dev, 158 "unable to dma-map scratch page\n"); 159 rc = -ENOMEM; 160 goto err_out_nounmap; 161 } 162 } else { 163 bridge->scratch_page_dma = page_to_phys(page); 164 } 165 166 bridge->scratch_page = bridge->driver->mask_memory(bridge, 167 bridge->scratch_page_dma, 0); 168 } 169 170 size_value = bridge->driver->fetch_size(); 171 if (size_value == 0) { 172 dev_err(&bridge->dev->dev, "can't determine aperture size\n"); 173 rc = -EINVAL; 174 goto err_out; 175 } 176 if (bridge->driver->create_gatt_table(bridge)) { 177 dev_err(&bridge->dev->dev, 178 "can't get memory for graphics translation table\n"); 179 rc = -ENOMEM; 180 goto err_out; 181 } 182 got_gatt = 1; 183 184 bridge->key_list = vmalloc(PAGE_SIZE * 4); 185 if (bridge->key_list == NULL) { 186 dev_err(&bridge->dev->dev, 187 "can't allocate memory for key lists\n"); 188 rc = -ENOMEM; 189 goto err_out; 190 } 191 got_keylist = 1; 192 193 memset(bridge->key_list, 0, PAGE_SIZE * 4); 194 195 if (bridge->driver->configure()) { 196 dev_err(&bridge->dev->dev, "error configuring host chipset\n"); 197 rc = -EINVAL; 198 goto err_out; 199 } 200 INIT_LIST_HEAD(&bridge->mapped_list); 201 spin_lock_init(&bridge->mapped_lock); 202 203 return 0; 204 205err_out: 206 if (bridge->driver->needs_scratch_page && 207 bridge->driver->agp_unmap_page) { 208 bridge->driver->agp_unmap_page(bridge->scratch_page_page, 209 bridge->scratch_page_dma); 210 } 211err_out_nounmap: 212 if (bridge->driver->needs_scratch_page) { 213 void *va = page_address(bridge->scratch_page_page); 214 215 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP); 216 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE); 217 } 218 if (got_gatt) 219 bridge->driver->free_gatt_table(bridge); 220 if (got_keylist) { 221 vfree(bridge->key_list); 222 bridge->key_list = NULL; 223 } 224 return rc; 225} 226 227/* cannot be __exit b/c as it could be called from __init code */ 228static void agp_backend_cleanup(struct agp_bridge_data *bridge) 229{ 230 if (bridge->driver->cleanup) 231 bridge->driver->cleanup(); 232 if (bridge->driver->free_gatt_table) 233 bridge->driver->free_gatt_table(bridge); 234 235 vfree(bridge->key_list); 236 bridge->key_list = NULL; 237 238 if (bridge->driver->agp_destroy_page && 239 bridge->driver->needs_scratch_page) { 240 void *va = page_address(bridge->scratch_page_page); 241 242 if (bridge->driver->agp_unmap_page) 243 bridge->driver->agp_unmap_page(bridge->scratch_page_page, 244 bridge->scratch_page_dma); 245 246 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP); 247 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE); 248 } 249} 250 251/* When we remove the global variable agp_bridge from all drivers 252 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated 253 */ 254 255struct agp_bridge_data *agp_alloc_bridge(void) 256{ 257 struct agp_bridge_data *bridge; 258 259 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); 260 if (!bridge) 261 return NULL; 262 263 atomic_set(&bridge->agp_in_use, 0); 264 atomic_set(&bridge->current_memory_agp, 0); 265 266 if (list_empty(&agp_bridges)) 267 agp_bridge = bridge; 268 269 return bridge; 270} 271EXPORT_SYMBOL(agp_alloc_bridge); 272 273 274void agp_put_bridge(struct agp_bridge_data *bridge) 275{ 276 kfree(bridge); 277 278 if (list_empty(&agp_bridges)) 279 agp_bridge = NULL; 280} 281EXPORT_SYMBOL(agp_put_bridge); 282 283 284int agp_add_bridge(struct agp_bridge_data *bridge) 285{ 286 int error; 287 288 if (agp_off) { 289 error = -ENODEV; 290 goto err_put_bridge; 291 } 292 293 if (!bridge->dev) { 294 printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n"); 295 error = -EINVAL; 296 goto err_put_bridge; 297 } 298 299 /* Grab reference on the chipset driver. */ 300 if (!try_module_get(bridge->driver->owner)) { 301 dev_info(&bridge->dev->dev, "can't lock chipset driver\n"); 302 error = -EINVAL; 303 goto err_put_bridge; 304 } 305 306 error = agp_backend_initialize(bridge); 307 if (error) { 308 dev_info(&bridge->dev->dev, 309 "agp_backend_initialize() failed\n"); 310 goto err_out; 311 } 312 313 if (list_empty(&agp_bridges)) { 314 error = agp_frontend_initialize(); 315 if (error) { 316 dev_info(&bridge->dev->dev, 317 "agp_frontend_initialize() failed\n"); 318 goto frontend_err; 319 } 320 321 dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n", 322 bridge->driver->fetch_size(), bridge->gart_bus_addr); 323 324 } 325 326 list_add(&bridge->list, &agp_bridges); 327 return 0; 328 329frontend_err: 330 agp_backend_cleanup(bridge); 331err_out: 332 module_put(bridge->driver->owner); 333err_put_bridge: 334 agp_put_bridge(bridge); 335 return error; 336} 337EXPORT_SYMBOL_GPL(agp_add_bridge); 338 339 340void agp_remove_bridge(struct agp_bridge_data *bridge) 341{ 342 agp_backend_cleanup(bridge); 343 list_del(&bridge->list); 344 if (list_empty(&agp_bridges)) 345 agp_frontend_cleanup(); 346 module_put(bridge->driver->owner); 347} 348EXPORT_SYMBOL_GPL(agp_remove_bridge); 349 350int agp_off; 351int agp_try_unsupported_boot; 352EXPORT_SYMBOL(agp_off); 353EXPORT_SYMBOL(agp_try_unsupported_boot); 354 355static int __init agp_init(void) 356{ 357 if (!agp_off) 358 printk(KERN_INFO "Linux agpgart interface v%d.%d\n", 359 AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR); 360 return 0; 361} 362 363static void __exit agp_exit(void) 364{ 365} 366 367#ifndef MODULE 368static __init int agp_setup(char *s) 369{ 370 if (!strcmp(s,"off")) 371 agp_off = 1; 372 if (!strcmp(s,"try_unsupported")) 373 agp_try_unsupported_boot = 1; 374 return 1; 375} 376__setup("agp=", agp_setup); 377#endif 378 379MODULE_AUTHOR("Dave Jones <davej@redhat.com>"); 380MODULE_DESCRIPTION("AGP GART driver"); 381MODULE_LICENSE("GPL and additional rights"); 382MODULE_ALIAS_MISCDEV(AGPGART_MINOR); 383 384module_init(agp_init); 385module_exit(agp_exit); 386