| 1 | /* |
| 2 | * Abstraction of the AGP GART interface. |
| 3 | * |
| 4 | * This version is for Linux and Free/Open/NetBSD. |
| 5 | * |
| 6 | * Copyright © 2000 VA Linux Systems, Inc. |
| 7 | * Copyright © 2001 The XFree86 Project, Inc. |
| 8 | */ |
| 9 | |
| 10 | #ifdef HAVE_XORG_CONFIG_H |
| 11 | #include <xorg-config.h> |
| 12 | #endif |
| 13 | |
| 14 | #include <X11/X.h> |
| 15 | #include "xf86.h" |
| 16 | #include "xf86Priv.h" |
| 17 | #include "xf86_OSlib.h" |
| 18 | #include "xf86OSpriv.h" |
| 19 | |
| 20 | #if defined(linux) |
| 21 | #include <asm/ioctl.h> |
| 22 | #include <linux/agpgart.h> |
| 23 | #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) |
| 24 | #include <sys/ioctl.h> |
| 25 | #include <sys/agpio.h> |
| 26 | #endif |
| 27 | |
| 28 | #ifndef AGP_DEVICE |
| 29 | #define AGP_DEVICE "/dev/agpgart" |
| 30 | #endif |
| 31 | /* AGP page size is independent of the host page size. */ |
| 32 | #ifndef AGP_PAGE_SIZE |
| 33 | #define AGP_PAGE_SIZE 4096 |
| 34 | #endif |
| 35 | #define AGPGART_MAJOR_VERSION 0 |
| 36 | #define AGPGART_MINOR_VERSION 99 |
| 37 | |
| 38 | static int gartFd = -1; |
| 39 | static int acquiredScreen = -1; |
| 40 | static Bool initDone = FALSE; |
| 41 | |
| 42 | /* |
| 43 | * Close /dev/agpgart. This frees all associated memory allocated during |
| 44 | * this server generation. |
| 45 | */ |
| 46 | Bool |
| 47 | xf86GARTCloseScreen(int screenNum) |
| 48 | { |
| 49 | if (gartFd != -1) { |
| 50 | close(gartFd); |
| 51 | acquiredScreen = -1; |
| 52 | gartFd = -1; |
| 53 | initDone = FALSE; |
| 54 | } |
| 55 | return TRUE; |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * Open /dev/agpgart. Keep it open until xf86GARTCloseScreen is called. |
| 60 | */ |
| 61 | static Bool |
| 62 | GARTInit(int screenNum) |
| 63 | { |
| 64 | struct _agp_info agpinf; |
| 65 | |
| 66 | if (initDone) |
| 67 | return gartFd != -1; |
| 68 | |
| 69 | initDone = TRUE; |
| 70 | |
| 71 | if (gartFd == -1) |
| 72 | gartFd = open(AGP_DEVICE, O_RDWR, 0); |
| 73 | else |
| 74 | return FALSE; |
| 75 | |
| 76 | if (gartFd == -1) { |
| 77 | xf86DrvMsg(screenNum, X_ERROR, |
| 78 | "GARTInit: Unable to open " AGP_DEVICE " (%s)\n", |
| 79 | strerror(errno)); |
| 80 | return FALSE; |
| 81 | } |
| 82 | |
| 83 | xf86AcquireGART(-1); |
| 84 | /* Check the kernel driver version. */ |
| 85 | if (ioctl(gartFd, AGPIOC_INFO, &agpinf) != 0) { |
| 86 | xf86DrvMsg(screenNum, X_ERROR, |
| 87 | "GARTInit: AGPIOC_INFO failed (%s)\n", strerror(errno)); |
| 88 | close(gartFd); |
| 89 | gartFd = -1; |
| 90 | return FALSE; |
| 91 | } |
| 92 | xf86ReleaseGART(-1); |
| 93 | |
| 94 | #if defined(linux) |
| 95 | /* Per Dave Jones, every effort will be made to keep the |
| 96 | * agpgart interface backwards compatible, so allow all |
| 97 | * future versions. |
| 98 | */ |
| 99 | if ( |
| 100 | #if (AGPGART_MAJOR_VERSION > 0) /* quiet compiler */ |
| 101 | agpinf.version.major < AGPGART_MAJOR_VERSION || |
| 102 | #endif |
| 103 | (agpinf.version.major == AGPGART_MAJOR_VERSION && |
| 104 | agpinf.version.minor < AGPGART_MINOR_VERSION)) { |
| 105 | xf86DrvMsg(screenNum, X_ERROR, |
| 106 | "GARTInit: Kernel agpgart driver version is not current" |
| 107 | " (%d.%d vs %d.%d)\n", |
| 108 | agpinf.version.major, agpinf.version.minor, |
| 109 | AGPGART_MAJOR_VERSION, AGPGART_MINOR_VERSION); |
| 110 | close(gartFd); |
| 111 | gartFd = -1; |
| 112 | return FALSE; |
| 113 | } |
| 114 | #endif |
| 115 | |
| 116 | return TRUE; |
| 117 | } |
| 118 | |
| 119 | Bool |
| 120 | xf86AgpGARTSupported(void) |
| 121 | { |
| 122 | return GARTInit(-1); |
| 123 | } |
| 124 | |
| 125 | AgpInfoPtr |
| 126 | xf86GetAGPInfo(int screenNum) |
| 127 | { |
| 128 | struct _agp_info agpinf; |
| 129 | AgpInfoPtr info; |
| 130 | |
| 131 | if (!GARTInit(screenNum)) |
| 132 | return NULL; |
| 133 | |
| 134 | if ((info = calloc(sizeof(AgpInfo), 1)) == NULL) { |
| 135 | xf86DrvMsg(screenNum, X_ERROR, |
| 136 | "xf86GetAGPInfo: Failed to allocate AgpInfo\n"); |
| 137 | return NULL; |
| 138 | } |
| 139 | |
| 140 | memset((char *) &agpinf, 0, sizeof(agpinf)); |
| 141 | |
| 142 | if (ioctl(gartFd, AGPIOC_INFO, &agpinf) != 0) { |
| 143 | xf86DrvMsg(screenNum, X_ERROR, |
| 144 | "xf86GetAGPInfo: AGPIOC_INFO failed (%s)\n", |
| 145 | strerror(errno)); |
| 146 | return NULL; |
| 147 | } |
| 148 | |
| 149 | info->bridgeId = agpinf.bridge_id; |
| 150 | info->agpMode = agpinf.agp_mode; |
| 151 | info->base = agpinf.aper_base; |
| 152 | info->size = agpinf.aper_size; |
| 153 | info->totalPages = agpinf.pg_total; |
| 154 | info->systemPages = agpinf.pg_system; |
| 155 | info->usedPages = agpinf.pg_used; |
| 156 | |
| 157 | xf86DrvMsg(screenNum, X_INFO, "Kernel reported %zu total, %zu used\n", |
| 158 | agpinf.pg_total, agpinf.pg_used); |
| 159 | |
| 160 | return info; |
| 161 | } |
| 162 | |
| 163 | /* |
| 164 | * XXX If multiple screens can acquire the GART, should we have a reference |
| 165 | * count instead of using acquiredScreen? |
| 166 | */ |
| 167 | |
| 168 | Bool |
| 169 | xf86AcquireGART(int screenNum) |
| 170 | { |
| 171 | if (screenNum != -1 && !GARTInit(screenNum)) |
| 172 | return FALSE; |
| 173 | |
| 174 | if (screenNum == -1 || acquiredScreen != screenNum) { |
| 175 | if (ioctl(gartFd, AGPIOC_ACQUIRE, 0) != 0) { |
| 176 | xf86DrvMsg(screenNum, X_WARNING, |
| 177 | "xf86AcquireGART: AGPIOC_ACQUIRE failed (%s)\n", |
| 178 | strerror(errno)); |
| 179 | return FALSE; |
| 180 | } |
| 181 | acquiredScreen = screenNum; |
| 182 | } |
| 183 | return TRUE; |
| 184 | } |
| 185 | |
| 186 | Bool |
| 187 | xf86ReleaseGART(int screenNum) |
| 188 | { |
| 189 | if (screenNum != -1 && !GARTInit(screenNum)) |
| 190 | return FALSE; |
| 191 | |
| 192 | if (acquiredScreen == screenNum) { |
| 193 | /* |
| 194 | * The FreeBSD agp driver removes allocations on release. |
| 195 | * The Linux driver doesn't. xf86ReleaseGART() is expected |
| 196 | * to give up access to the GART, but not to remove any |
| 197 | * allocations. |
| 198 | */ |
| 199 | #if !defined(linux) |
| 200 | if (screenNum == -1) |
| 201 | #endif |
| 202 | { |
| 203 | if (ioctl(gartFd, AGPIOC_RELEASE, 0) != 0) { |
| 204 | xf86DrvMsg(screenNum, X_WARNING, |
| 205 | "xf86ReleaseGART: AGPIOC_RELEASE failed (%s)\n", |
| 206 | strerror(errno)); |
| 207 | return FALSE; |
| 208 | } |
| 209 | acquiredScreen = -1; |
| 210 | } |
| 211 | return TRUE; |
| 212 | } |
| 213 | return FALSE; |
| 214 | } |
| 215 | |
| 216 | int |
| 217 | xf86AllocateGARTMemory(int screenNum, unsigned long size, int type, |
| 218 | unsigned long *physical) |
| 219 | { |
| 220 | struct _agp_allocate alloc; |
| 221 | int pages; |
| 222 | |
| 223 | /* |
| 224 | * Allocates "size" bytes of GART memory (rounds up to the next |
| 225 | * page multiple) or type "type". A handle (key) for the allocated |
| 226 | * memory is returned. On error, the return value is -1. |
| 227 | */ |
| 228 | |
| 229 | if (!GARTInit(screenNum) || acquiredScreen != screenNum) |
| 230 | return -1; |
| 231 | |
| 232 | pages = (size / AGP_PAGE_SIZE); |
| 233 | if (size % AGP_PAGE_SIZE != 0) |
| 234 | pages++; |
| 235 | |
| 236 | /* XXX check for pages == 0? */ |
| 237 | |
| 238 | alloc.pg_count = pages; |
| 239 | alloc.type = type; |
| 240 | |
| 241 | if (ioctl(gartFd, AGPIOC_ALLOCATE, &alloc) != 0) { |
| 242 | xf86DrvMsg(screenNum, X_WARNING, "xf86AllocateGARTMemory: " |
| 243 | "allocation of %d pages failed\n\t(%s)\n", pages, |
| 244 | strerror(errno)); |
| 245 | return -1; |
| 246 | } |
| 247 | |
| 248 | if (physical) |
| 249 | *physical = alloc.physical; |
| 250 | |
| 251 | return alloc.key; |
| 252 | } |
| 253 | |
| 254 | Bool |
| 255 | xf86DeallocateGARTMemory(int screenNum, int key) |
| 256 | { |
| 257 | if (!GARTInit(screenNum) || acquiredScreen != screenNum) |
| 258 | return FALSE; |
| 259 | |
| 260 | if (acquiredScreen != screenNum) { |
| 261 | xf86DrvMsg(screenNum, X_ERROR, |
| 262 | "xf86UnbindGARTMemory: AGP not acquired by this screen\n"); |
| 263 | return FALSE; |
| 264 | } |
| 265 | |
| 266 | #ifdef __linux__ |
| 267 | if (ioctl(gartFd, AGPIOC_DEALLOCATE, (int *) (uintptr_t) key) != 0) { |
| 268 | #else |
| 269 | if (ioctl(gartFd, AGPIOC_DEALLOCATE, &key) != 0) { |
| 270 | #endif |
| 271 | xf86DrvMsg(screenNum, X_WARNING, "xf86DeAllocateGARTMemory: " |
| 272 | "deallocation gart memory with key %d failed\n\t(%s)\n", |
| 273 | key, strerror(errno)); |
| 274 | return FALSE; |
| 275 | } |
| 276 | |
| 277 | return TRUE; |
| 278 | } |
| 279 | |
| 280 | /* Bind GART memory with "key" at "offset" */ |
| 281 | Bool |
| 282 | xf86BindGARTMemory(int screenNum, int key, unsigned long offset) |
| 283 | { |
| 284 | struct _agp_bind bind; |
| 285 | int pageOffset; |
| 286 | |
| 287 | if (!GARTInit(screenNum) || acquiredScreen != screenNum) |
| 288 | return FALSE; |
| 289 | |
| 290 | if (acquiredScreen != screenNum) { |
| 291 | xf86DrvMsg(screenNum, X_ERROR, |
| 292 | "xf86BindGARTMemory: AGP not acquired by this screen\n"); |
| 293 | return FALSE; |
| 294 | } |
| 295 | |
| 296 | if (offset % AGP_PAGE_SIZE != 0) { |
| 297 | xf86DrvMsg(screenNum, X_WARNING, "xf86BindGARTMemory: " |
| 298 | "offset (0x%lx) is not page-aligned (%d)\n", |
| 299 | offset, AGP_PAGE_SIZE); |
| 300 | return FALSE; |
| 301 | } |
| 302 | pageOffset = offset / AGP_PAGE_SIZE; |
| 303 | |
| 304 | xf86DrvMsgVerb(screenNum, X_INFO, 3, |
| 305 | "xf86BindGARTMemory: bind key %d at 0x%08lx " |
| 306 | "(pgoffset %d)\n", key, offset, pageOffset); |
| 307 | |
| 308 | bind.pg_start = pageOffset; |
| 309 | bind.key = key; |
| 310 | |
| 311 | if (ioctl(gartFd, AGPIOC_BIND, &bind) != 0) { |
| 312 | xf86DrvMsg(screenNum, X_WARNING, "xf86BindGARTMemory: " |
| 313 | "binding of gart memory with key %d\n" |
| 314 | "\tat offset 0x%lx failed (%s)\n", |
| 315 | key, offset, strerror(errno)); |
| 316 | return FALSE; |
| 317 | } |
| 318 | |
| 319 | return TRUE; |
| 320 | } |
| 321 | |
| 322 | /* Unbind GART memory with "key" */ |
| 323 | Bool |
| 324 | xf86UnbindGARTMemory(int screenNum, int key) |
| 325 | { |
| 326 | struct _agp_unbind unbind; |
| 327 | |
| 328 | if (!GARTInit(screenNum) || acquiredScreen != screenNum) |
| 329 | return FALSE; |
| 330 | |
| 331 | if (acquiredScreen != screenNum) { |
| 332 | xf86DrvMsg(screenNum, X_ERROR, |
| 333 | "xf86UnbindGARTMemory: AGP not acquired by this screen\n"); |
| 334 | return FALSE; |
| 335 | } |
| 336 | |
| 337 | unbind.priority = 0; |
| 338 | unbind.key = key; |
| 339 | |
| 340 | if (ioctl(gartFd, AGPIOC_UNBIND, &unbind) != 0) { |
| 341 | xf86DrvMsg(screenNum, X_WARNING, "xf86UnbindGARTMemory: " |
| 342 | "unbinding of gart memory with key %d " |
| 343 | "failed (%s)\n", key, strerror(errno)); |
| 344 | return FALSE; |
| 345 | } |
| 346 | |
| 347 | xf86DrvMsgVerb(screenNum, X_INFO, 3, |
| 348 | "xf86UnbindGARTMemory: unbind key %d\n", key); |
| 349 | |
| 350 | return TRUE; |
| 351 | } |
| 352 | |
| 353 | /* XXX Interface may change. */ |
| 354 | Bool |
| 355 | xf86EnableAGP(int screenNum, CARD32 mode) |
| 356 | { |
| 357 | agp_setup setup; |
| 358 | |
| 359 | if (!GARTInit(screenNum) || acquiredScreen != screenNum) |
| 360 | return FALSE; |
| 361 | |
| 362 | setup.agp_mode = mode; |
| 363 | if (ioctl(gartFd, AGPIOC_SETUP, &setup) != 0) { |
| 364 | xf86DrvMsg(screenNum, X_WARNING, "xf86EnableAGP: " |
| 365 | "AGPIOC_SETUP with mode %ld failed (%s)\n", |
| 366 | (unsigned long) mode, strerror(errno)); |
| 367 | return FALSE; |
| 368 | } |
| 369 | |
| 370 | return TRUE; |
| 371 | } |