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 46 #define AGPGART_VERSION_MINOR 103 47 static const struct agp_version agp_current_version = 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 99 100 static const struct { int mem, agp; } maxes_table[] = { 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 dev_err(&bridge->dev->dev, 148 "can't get memory for scratch page\n"); 149 return -ENOMEM; 150 } 151 152 bridge->scratch_page_real = virt_to_gart(addr); 153 bridge->scratch_page = 154 bridge->driver->mask_memory(bridge, bridge->scratch_page_real, 0); 155 } 156 157 size_value = bridge->driver->fetch_size(); 158 if (size_value == 0) { 159 dev_err(&bridge->dev->dev, "can't determine aperture size\n"); 160 rc = -EINVAL; 161 goto err_out; 162 } 163 if (bridge->driver->create_gatt_table(bridge)) { 164 dev_err(&bridge->dev->dev, 165 "can't get memory for graphics translation table\n"); 166 rc = -ENOMEM; 167 goto err_out; 168 } 169 got_gatt = 1; 170 171 bridge->key_list = vmalloc(PAGE_SIZE * 4); 172 if (bridge->key_list == NULL) { 173 dev_err(&bridge->dev->dev, 174 "can't allocate memory for key lists\n"); 175 rc = -ENOMEM; 176 goto err_out; 177 } 178 got_keylist = 1; 179 180 /* FIXME vmalloc'd memory not guaranteed contiguous */ 181 memset(bridge->key_list, 0, PAGE_SIZE * 4); 182 183 if (bridge->driver->configure()) { 184 dev_err(&bridge->dev->dev, "error configuring host chipset\n"); 185 rc = -EINVAL; 186 goto err_out; 187 } 188 INIT_LIST_HEAD(&bridge->mapped_list); 189 spin_lock_init(&bridge->mapped_lock); 190 191 return 0; 192 193 err_out: 194 if (bridge->driver->needs_scratch_page) { 195 void *va = gart_to_virt(bridge->scratch_page_real); 196 197 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP); 198 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE); 199 } 200 if (got_gatt) 201 bridge->driver->free_gatt_table(bridge); 202 if (got_keylist) { 203 vfree(bridge->key_list); 204 bridge->key_list = NULL; 205 } 206 return rc; 207 } 208 209 /* cannot be __exit b/c as it could be called from __init code */ 210 static void agp_backend_cleanup(struct agp_bridge_data *bridge) 211 { 212 if (bridge->driver->cleanup) 213 bridge->driver->cleanup(); 214 if (bridge->driver->free_gatt_table) 215 bridge->driver->free_gatt_table(bridge); 216 217 vfree(bridge->key_list); 218 bridge->key_list = NULL; 219 220 if (bridge->driver->agp_destroy_page && 221 bridge->driver->needs_scratch_page) { 222 void *va = gart_to_virt(bridge->scratch_page_real); 223 224 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP); 225 bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE); 226 } 227 } 228 229 /* When we remove the global variable agp_bridge from all drivers 230 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated 231 */ 232 233 struct agp_bridge_data *agp_alloc_bridge(void) 234 { 235 struct agp_bridge_data *bridge; 236 237 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); 238 if (!bridge) 239 return NULL; 240 241 atomic_set(&bridge->agp_in_use, 0); 242 atomic_set(&bridge->current_memory_agp, 0); 243 244 if (list_empty(&agp_bridges)) 245 agp_bridge = bridge; 246 247 return bridge; 248 } 249 EXPORT_SYMBOL(agp_alloc_bridge); 250 251 252 void agp_put_bridge(struct agp_bridge_data *bridge) 253 { 254 kfree(bridge); 255 256 if (list_empty(&agp_bridges)) 257 agp_bridge = NULL; 258 } 259 EXPORT_SYMBOL(agp_put_bridge); 260 261 262 int agp_add_bridge(struct agp_bridge_data *bridge) 263 { 264 int error; 265 266 if (agp_off) 267 return -ENODEV; 268 269 if (!bridge->dev) { 270 printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n"); 271 return -EINVAL; 272 } 273 274 /* Grab reference on the chipset driver. */ 275 if (!try_module_get(bridge->driver->owner)) { 276 dev_info(&bridge->dev->dev, "can't lock chipset driver\n"); 277 return -EINVAL; 278 } 279 280 error = agp_backend_initialize(bridge); 281 if (error) { 282 dev_info(&bridge->dev->dev, 283 "agp_backend_initialize() failed\n"); 284 goto err_out; 285 } 286 287 if (list_empty(&agp_bridges)) { 288 error = agp_frontend_initialize(); 289 if (error) { 290 dev_info(&bridge->dev->dev, 291 "agp_frontend_initialize() failed\n"); 292 goto frontend_err; 293 } 294 295 dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n", 296 bridge->driver->fetch_size(), bridge->gart_bus_addr); 297 298 } 299 300 list_add(&bridge->list, &agp_bridges); 301 return 0; 302 303 frontend_err: 304 agp_backend_cleanup(bridge); 305 err_out: 306 module_put(bridge->driver->owner); 307 agp_put_bridge(bridge); 308 return error; 309 } 310 EXPORT_SYMBOL_GPL(agp_add_bridge); 311 312 313 void agp_remove_bridge(struct agp_bridge_data *bridge) 314 { 315 agp_backend_cleanup(bridge); 316 list_del(&bridge->list); 317 if (list_empty(&agp_bridges)) 318 agp_frontend_cleanup(); 319 module_put(bridge->driver->owner); 320 } 321 EXPORT_SYMBOL_GPL(agp_remove_bridge); 322 323 int agp_off; 324 int agp_try_unsupported_boot; 325 EXPORT_SYMBOL(agp_off); 326 EXPORT_SYMBOL(agp_try_unsupported_boot); 327 328 static int __init agp_init(void) 329 { 330 if (!agp_off) 331 printk(KERN_INFO "Linux agpgart interface v%d.%d\n", 332 AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR); 333 return 0; 334 } 335 336 static void __exit agp_exit(void) 337 { 338 } 339 340 #ifndef MODULE 341 static __init int agp_setup(char *s) 342 { 343 if (!strcmp(s,"off")) 344 agp_off = 1; 345 if (!strcmp(s,"try_unsupported")) 346 agp_try_unsupported_boot = 1; 347 return 1; 348 } 349 __setup("agp=", agp_setup); 350 #endif 351 352 MODULE_AUTHOR("Dave Jones <davej@redhat.com>"); 353 MODULE_DESCRIPTION("AGP GART driver"); 354 MODULE_LICENSE("GPL and additional rights"); 355 MODULE_ALIAS_MISCDEV(AGPGART_MINOR); 356 357 module_init(agp_init); 358 module_exit(agp_exit); 359 360