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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 | /* * AGPGART driver backend routines. * Copyright (C) 2004 Silicon Graphics, Inc. * Copyright (C) 2002-2003 Dave Jones. * Copyright (C) 1999 Jeff Hartmann. * Copyright (C) 1999 Precision Insight, Inc. * Copyright (C) 1999 Xi Graphics, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * JEFF HARTMANN, DAVE JONES, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * TODO: * - Allocate more than order 0 pages to avoid too much linear map splitting. */ #include <linux/module.h> #include <linux/pci.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/pagemap.h> #include <linux/miscdevice.h> #include <linux/pm.h> #include <linux/agp_backend.h> #include <linux/agpgart.h> #include <linux/vmalloc.h> #include <asm/io.h> #include "agp.h" /* Due to XFree86 brain-damage, we can't go to 1.0 until they * fix some real stupidity. It's only by chance we can bump * past 0.99 at all due to some boolean logic error. */ #define AGPGART_VERSION_MAJOR 0 #define AGPGART_VERSION_MINOR 103 static const struct agp_version agp_current_version = { .major = AGPGART_VERSION_MAJOR, .minor = AGPGART_VERSION_MINOR, }; struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) = &agp_generic_find_bridge; struct agp_bridge_data *agp_bridge; LIST_HEAD(agp_bridges); EXPORT_SYMBOL(agp_bridge); EXPORT_SYMBOL(agp_bridges); EXPORT_SYMBOL(agp_find_bridge); /** * agp_backend_acquire - attempt to acquire an agp backend. * */ struct agp_bridge_data *agp_backend_acquire(struct pci_dev *pdev) { struct agp_bridge_data *bridge; bridge = agp_find_bridge(pdev); if (!bridge) return NULL; if (atomic_read(&bridge->agp_in_use)) return NULL; atomic_inc(&bridge->agp_in_use); return bridge; } EXPORT_SYMBOL(agp_backend_acquire); /** * agp_backend_release - release the lock on the agp backend. * * The caller must insure that the graphics aperture translation table * is read for use by another entity. * * (Ensure that all memory it bound is unbound.) */ void agp_backend_release(struct agp_bridge_data *bridge) { if (bridge) atomic_dec(&bridge->agp_in_use); } EXPORT_SYMBOL(agp_backend_release); static const struct { int mem, agp; } maxes_table[] = { {0, 0}, {32, 4}, {64, 28}, {128, 96}, {256, 204}, {512, 440}, {1024, 942}, {2048, 1920}, {4096, 3932} }; static int agp_find_max(void) { long memory, index, result; #if PAGE_SHIFT < 20 memory = totalram_pages >> (20 - PAGE_SHIFT); #else memory = totalram_pages << (PAGE_SHIFT - 20); #endif index = 1; while ((memory > maxes_table[index].mem) && (index < 8)) index++; result = maxes_table[index - 1].agp + ( (memory - maxes_table[index - 1].mem) * (maxes_table[index].agp - maxes_table[index - 1].agp)) / (maxes_table[index].mem - maxes_table[index - 1].mem); result = result << (20 - PAGE_SHIFT); return result; } static int agp_backend_initialize(struct agp_bridge_data *bridge) { int size_value, rc, got_gatt=0, got_keylist=0; bridge->max_memory_agp = agp_find_max(); bridge->version = &agp_current_version; if (bridge->driver->needs_scratch_page) { struct page *page = bridge->driver->agp_alloc_page(bridge); if (!page) { dev_err(&bridge->dev->dev, "can't get memory for scratch page\n"); return -ENOMEM; } bridge->scratch_page_page = page; bridge->scratch_page_dma = page_to_phys(page); bridge->scratch_page = bridge->driver->mask_memory(bridge, bridge->scratch_page_dma, 0); } size_value = bridge->driver->fetch_size(); if (size_value == 0) { dev_err(&bridge->dev->dev, "can't determine aperture size\n"); rc = -EINVAL; goto err_out; } if (bridge->driver->create_gatt_table(bridge)) { dev_err(&bridge->dev->dev, "can't get memory for graphics translation table\n"); rc = -ENOMEM; goto err_out; } got_gatt = 1; bridge->key_list = vzalloc(PAGE_SIZE * 4); if (bridge->key_list == NULL) { dev_err(&bridge->dev->dev, "can't allocate memory for key lists\n"); rc = -ENOMEM; goto err_out; } got_keylist = 1; /* FIXME vmalloc'd memory not guaranteed contiguous */ if (bridge->driver->configure()) { dev_err(&bridge->dev->dev, "error configuring host chipset\n"); rc = -EINVAL; goto err_out; } INIT_LIST_HEAD(&bridge->mapped_list); spin_lock_init(&bridge->mapped_lock); return 0; err_out: if (bridge->driver->needs_scratch_page) { struct page *page = bridge->scratch_page_page; bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP); bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE); } if (got_gatt) bridge->driver->free_gatt_table(bridge); if (got_keylist) { vfree(bridge->key_list); bridge->key_list = NULL; } return rc; } /* cannot be __exit b/c as it could be called from __init code */ static void agp_backend_cleanup(struct agp_bridge_data *bridge) { if (bridge->driver->cleanup) bridge->driver->cleanup(); if (bridge->driver->free_gatt_table) bridge->driver->free_gatt_table(bridge); vfree(bridge->key_list); bridge->key_list = NULL; if (bridge->driver->agp_destroy_page && bridge->driver->needs_scratch_page) { struct page *page = bridge->scratch_page_page; bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_UNMAP); bridge->driver->agp_destroy_page(page, AGP_PAGE_DESTROY_FREE); } } /* When we remove the global variable agp_bridge from all drivers * then agp_alloc_bridge and agp_generic_find_bridge need to be updated */ struct agp_bridge_data *agp_alloc_bridge(void) { struct agp_bridge_data *bridge; bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); if (!bridge) return NULL; atomic_set(&bridge->agp_in_use, 0); atomic_set(&bridge->current_memory_agp, 0); if (list_empty(&agp_bridges)) agp_bridge = bridge; return bridge; } EXPORT_SYMBOL(agp_alloc_bridge); void agp_put_bridge(struct agp_bridge_data *bridge) { kfree(bridge); if (list_empty(&agp_bridges)) agp_bridge = NULL; } EXPORT_SYMBOL(agp_put_bridge); int agp_add_bridge(struct agp_bridge_data *bridge) { int error; if (agp_off) { error = -ENODEV; goto err_put_bridge; } if (!bridge->dev) { printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n"); error = -EINVAL; goto err_put_bridge; } /* Grab reference on the chipset driver. */ if (!try_module_get(bridge->driver->owner)) { dev_info(&bridge->dev->dev, "can't lock chipset driver\n"); error = -EINVAL; goto err_put_bridge; } error = agp_backend_initialize(bridge); if (error) { dev_info(&bridge->dev->dev, "agp_backend_initialize() failed\n"); goto err_out; } if (list_empty(&agp_bridges)) { error = agp_frontend_initialize(); if (error) { dev_info(&bridge->dev->dev, "agp_frontend_initialize() failed\n"); goto frontend_err; } dev_info(&bridge->dev->dev, "AGP aperture is %dM @ 0x%lx\n", bridge->driver->fetch_size(), bridge->gart_bus_addr); } list_add(&bridge->list, &agp_bridges); return 0; frontend_err: agp_backend_cleanup(bridge); err_out: module_put(bridge->driver->owner); err_put_bridge: agp_put_bridge(bridge); return error; } EXPORT_SYMBOL_GPL(agp_add_bridge); void agp_remove_bridge(struct agp_bridge_data *bridge) { agp_backend_cleanup(bridge); list_del(&bridge->list); if (list_empty(&agp_bridges)) agp_frontend_cleanup(); module_put(bridge->driver->owner); } EXPORT_SYMBOL_GPL(agp_remove_bridge); int agp_off; int agp_try_unsupported_boot; EXPORT_SYMBOL(agp_off); EXPORT_SYMBOL(agp_try_unsupported_boot); static int __init agp_init(void) { if (!agp_off) printk(KERN_INFO "Linux agpgart interface v%d.%d\n", AGPGART_VERSION_MAJOR, AGPGART_VERSION_MINOR); return 0; } static void __exit agp_exit(void) { } #ifndef MODULE static __init int agp_setup(char *s) { if (!strcmp(s,"off")) agp_off = 1; if (!strcmp(s,"try_unsupported")) agp_try_unsupported_boot = 1; return 1; } __setup("agp=", agp_setup); #endif MODULE_AUTHOR("Dave Jones <davej@redhat.com>"); MODULE_DESCRIPTION("AGP GART driver"); MODULE_LICENSE("GPL and additional rights"); MODULE_ALIAS_MISCDEV(AGPGART_MINOR); module_init(agp_init); module_exit(agp_exit); |