1 /* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */ 2 /** 3 * \file drm_pci.c 4 * \brief Functions and ioctls to manage PCI memory 5 * 6 * \warning These interfaces aren't stable yet. 7 * 8 * \todo Implement the remaining ioctl's for the PCI pools. 9 * \todo The wrappers here are so thin that they would be better off inlined.. 10 * 11 * \author José Fonseca <jrfonseca@tungstengraphics.com> 12 * \author Leif Delgass <ldelgass@retinalburn.net> 13 */ 14 15 /* 16 * Copyright 2003 José Fonseca. 17 * Copyright 2003 Leif Delgass. 18 * All Rights Reserved. 19 * 20 * Permission is hereby granted, free of charge, to any person obtaining a 21 * copy of this software and associated documentation files (the "Software"), 22 * to deal in the Software without restriction, including without limitation 23 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 24 * and/or sell copies of the Software, and to permit persons to whom the 25 * Software is furnished to do so, subject to the following conditions: 26 * 27 * The above copyright notice and this permission notice (including the next 28 * paragraph) shall be included in all copies or substantial portions of the 29 * Software. 30 * 31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 32 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 33 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 34 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 35 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 36 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 37 */ 38 39 #include <linux/pci.h> 40 #include <linux/slab.h> 41 #include <linux/dma-mapping.h> 42 #include "drmP.h" 43 44 /**********************************************************************/ 45 /** \name PCI memory */ 46 /*@{*/ 47 48 /** 49 * \brief Allocate a PCI consistent memory block, for DMA. 50 */ 51 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) 52 { 53 drm_dma_handle_t *dmah; 54 #if 1 55 unsigned long addr; 56 size_t sz; 57 #endif 58 59 /* pci_alloc_consistent only guarantees alignment to the smallest 60 * PAGE_SIZE order which is greater than or equal to the requested size. 61 * Return NULL here for now to make sure nobody tries for larger alignment 62 */ 63 if (align > size) 64 return NULL; 65 66 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); 67 if (!dmah) 68 return NULL; 69 70 dmah->size = size; 71 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); 72 73 if (dmah->vaddr == NULL) { 74 kfree(dmah); 75 return NULL; 76 } 77 78 memset(dmah->vaddr, 0, size); 79 80 /* XXX - Is virt_to_page() legal for consistent mem? */ 81 /* Reserve */ 82 for (addr = (unsigned long)dmah->vaddr, sz = size; 83 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 84 SetPageReserved(virt_to_page(addr)); 85 } 86 87 return dmah; 88 } 89 90 EXPORT_SYMBOL(drm_pci_alloc); 91 92 /** 93 * \brief Free a PCI consistent memory block without freeing its descriptor. 94 * 95 * This function is for internal use in the Linux-specific DRM core code. 96 */ 97 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 98 { 99 #if 1 100 unsigned long addr; 101 size_t sz; 102 #endif 103 104 if (dmah->vaddr) { 105 /* XXX - Is virt_to_page() legal for consistent mem? */ 106 /* Unreserve */ 107 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; 108 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 109 ClearPageReserved(virt_to_page(addr)); 110 } 111 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 112 dmah->busaddr); 113 } 114 } 115 116 /** 117 * \brief Free a PCI consistent memory block 118 */ 119 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 120 { 121 __drm_pci_free(dev, dmah); 122 kfree(dmah); 123 } 124 125 EXPORT_SYMBOL(drm_pci_free); 126 127 #ifdef CONFIG_PCI 128 129 static int drm_get_pci_domain(struct drm_device *dev) 130 { 131 #ifndef __alpha__ 132 /* For historical reasons, drm_get_pci_domain() is busticated 133 * on most archs and has to remain so for userspace interface 134 * < 1.4, except on alpha which was right from the beginning 135 */ 136 if (dev->if_version < 0x10004) 137 return 0; 138 #endif /* __alpha__ */ 139 140 return pci_domain_nr(dev->pdev->bus); 141 } 142 143 static int drm_pci_get_irq(struct drm_device *dev) 144 { 145 return dev->pdev->irq; 146 } 147 148 static const char *drm_pci_get_name(struct drm_device *dev) 149 { 150 struct pci_driver *pdriver = dev->driver->kdriver.pci; 151 return pdriver->name; 152 } 153 154 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 155 { 156 int len, ret; 157 struct pci_driver *pdriver = dev->driver->kdriver.pci; 158 master->unique_len = 40; 159 master->unique_size = master->unique_len; 160 master->unique = kmalloc(master->unique_size, GFP_KERNEL); 161 if (master->unique == NULL) 162 return -ENOMEM; 163 164 165 len = snprintf(master->unique, master->unique_len, 166 "pci:%04x:%02x:%02x.%d", 167 drm_get_pci_domain(dev), 168 dev->pdev->bus->number, 169 PCI_SLOT(dev->pdev->devfn), 170 PCI_FUNC(dev->pdev->devfn)); 171 172 if (len >= master->unique_len) { 173 DRM_ERROR("buffer overflow"); 174 ret = -EINVAL; 175 goto err; 176 } else 177 master->unique_len = len; 178 179 dev->devname = 180 kmalloc(strlen(pdriver->name) + 181 master->unique_len + 2, GFP_KERNEL); 182 183 if (dev->devname == NULL) { 184 ret = -ENOMEM; 185 goto err; 186 } 187 188 sprintf(dev->devname, "%s@%s", pdriver->name, 189 master->unique); 190 191 return 0; 192 err: 193 return ret; 194 } 195 196 int drm_pci_set_unique(struct drm_device *dev, 197 struct drm_master *master, 198 struct drm_unique *u) 199 { 200 int domain, bus, slot, func, ret; 201 const char *bus_name; 202 203 master->unique_len = u->unique_len; 204 master->unique_size = u->unique_len + 1; 205 master->unique = kmalloc(master->unique_size, GFP_KERNEL); 206 if (!master->unique) { 207 ret = -ENOMEM; 208 goto err; 209 } 210 211 if (copy_from_user(master->unique, u->unique, master->unique_len)) { 212 ret = -EFAULT; 213 goto err; 214 } 215 216 master->unique[master->unique_len] = '\0'; 217 218 bus_name = dev->driver->bus->get_name(dev); 219 dev->devname = kmalloc(strlen(bus_name) + 220 strlen(master->unique) + 2, GFP_KERNEL); 221 if (!dev->devname) { 222 ret = -ENOMEM; 223 goto err; 224 } 225 226 sprintf(dev->devname, "%s@%s", bus_name, 227 master->unique); 228 229 /* Return error if the busid submitted doesn't match the device's actual 230 * busid. 231 */ 232 ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func); 233 if (ret != 3) { 234 ret = -EINVAL; 235 goto err; 236 } 237 238 domain = bus >> 8; 239 bus &= 0xff; 240 241 if ((domain != drm_get_pci_domain(dev)) || 242 (bus != dev->pdev->bus->number) || 243 (slot != PCI_SLOT(dev->pdev->devfn)) || 244 (func != PCI_FUNC(dev->pdev->devfn))) { 245 ret = -EINVAL; 246 goto err; 247 } 248 return 0; 249 err: 250 return ret; 251 } 252 253 254 int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) 255 { 256 if ((p->busnum >> 8) != drm_get_pci_domain(dev) || 257 (p->busnum & 0xff) != dev->pdev->bus->number || 258 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) 259 return -EINVAL; 260 261 p->irq = dev->pdev->irq; 262 263 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, 264 p->irq); 265 return 0; 266 } 267 268 int drm_pci_agp_init(struct drm_device *dev) 269 { 270 if (drm_core_has_AGP(dev)) { 271 if (drm_pci_device_is_agp(dev)) 272 dev->agp = drm_agp_init(dev); 273 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP) 274 && (dev->agp == NULL)) { 275 DRM_ERROR("Cannot initialize the agpgart module.\n"); 276 return -EINVAL; 277 } 278 if (drm_core_has_MTRR(dev)) { 279 if (dev->agp) 280 dev->agp->agp_mtrr = 281 mtrr_add(dev->agp->agp_info.aper_base, 282 dev->agp->agp_info.aper_size * 283 1024 * 1024, MTRR_TYPE_WRCOMB, 1); 284 } 285 } 286 return 0; 287 } 288 289 static struct drm_bus drm_pci_bus = { 290 .bus_type = DRIVER_BUS_PCI, 291 .get_irq = drm_pci_get_irq, 292 .get_name = drm_pci_get_name, 293 .set_busid = drm_pci_set_busid, 294 .set_unique = drm_pci_set_unique, 295 .agp_init = drm_pci_agp_init, 296 }; 297 298 /** 299 * Register. 300 * 301 * \param pdev - PCI device structure 302 * \param ent entry from the PCI ID table with device type flags 303 * \return zero on success or a negative number on failure. 304 * 305 * Attempt to gets inter module "drm" information. If we are first 306 * then register the character device and inter module information. 307 * Try and register, if we fail to register, backout previous work. 308 */ 309 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, 310 struct drm_driver *driver) 311 { 312 struct drm_device *dev; 313 int ret; 314 315 DRM_DEBUG("\n"); 316 317 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 318 if (!dev) 319 return -ENOMEM; 320 321 ret = pci_enable_device(pdev); 322 if (ret) 323 goto err_g1; 324 325 pci_set_master(pdev); 326 327 dev->pdev = pdev; 328 dev->dev = &pdev->dev; 329 330 dev->pci_device = pdev->device; 331 dev->pci_vendor = pdev->vendor; 332 333 #ifdef __alpha__ 334 dev->hose = pdev->sysdata; 335 #endif 336 337 mutex_lock(&drm_global_mutex); 338 339 if ((ret = drm_fill_in_dev(dev, ent, driver))) { 340 printk(KERN_ERR "DRM: Fill_in_dev failed.\n"); 341 goto err_g2; 342 } 343 344 if (drm_core_check_feature(dev, DRIVER_MODESET)) { 345 pci_set_drvdata(pdev, dev); 346 ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL); 347 if (ret) 348 goto err_g2; 349 } 350 351 if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY))) 352 goto err_g3; 353 354 if (dev->driver->load) { 355 ret = dev->driver->load(dev, ent->driver_data); 356 if (ret) 357 goto err_g4; 358 } 359 360 /* setup the grouping for the legacy output */ 361 if (drm_core_check_feature(dev, DRIVER_MODESET)) { 362 ret = drm_mode_group_init_legacy_group(dev, 363 &dev->primary->mode_group); 364 if (ret) 365 goto err_g4; 366 } 367 368 list_add_tail(&dev->driver_item, &driver->device_list); 369 370 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", 371 driver->name, driver->major, driver->minor, driver->patchlevel, 372 driver->date, pci_name(pdev), dev->primary->index); 373 374 mutex_unlock(&drm_global_mutex); 375 return 0; 376 377 err_g4: 378 drm_put_minor(&dev->primary); 379 err_g3: 380 if (drm_core_check_feature(dev, DRIVER_MODESET)) 381 drm_put_minor(&dev->control); 382 err_g2: 383 pci_disable_device(pdev); 384 err_g1: 385 kfree(dev); 386 mutex_unlock(&drm_global_mutex); 387 return ret; 388 } 389 EXPORT_SYMBOL(drm_get_pci_dev); 390 391 /** 392 * PCI device initialization. Called direct from modules at load time. 393 * 394 * \return zero on success or a negative number on failure. 395 * 396 * Initializes a drm_device structures,registering the 397 * stubs and initializing the AGP device. 398 * 399 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and 400 * after the initialization for driver customization. 401 */ 402 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 403 { 404 struct pci_dev *pdev = NULL; 405 const struct pci_device_id *pid; 406 int i; 407 408 DRM_DEBUG("\n"); 409 410 INIT_LIST_HEAD(&driver->device_list); 411 driver->kdriver.pci = pdriver; 412 driver->bus = &drm_pci_bus; 413 414 if (driver->driver_features & DRIVER_MODESET) 415 return pci_register_driver(pdriver); 416 417 /* If not using KMS, fall back to stealth mode manual scanning. */ 418 for (i = 0; pdriver->id_table[i].vendor != 0; i++) { 419 pid = &pdriver->id_table[i]; 420 421 /* Loop around setting up a DRM device for each PCI device 422 * matching our ID and device class. If we had the internal 423 * function that pci_get_subsys and pci_get_class used, we'd 424 * be able to just pass pid in instead of doing a two-stage 425 * thing. 426 */ 427 pdev = NULL; 428 while ((pdev = 429 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 430 pid->subdevice, pdev)) != NULL) { 431 if ((pdev->class & pid->class_mask) != pid->class) 432 continue; 433 434 /* stealth mode requires a manual probe */ 435 pci_dev_get(pdev); 436 drm_get_pci_dev(pdev, pid, driver); 437 } 438 } 439 return 0; 440 } 441 442 #else 443 444 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 445 { 446 return -1; 447 } 448 449 #endif 450 451 EXPORT_SYMBOL(drm_pci_init); 452 453 /*@}*/ 454 void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) 455 { 456 struct drm_device *dev, *tmp; 457 DRM_DEBUG("\n"); 458 459 if (driver->driver_features & DRIVER_MODESET) { 460 pci_unregister_driver(pdriver); 461 } else { 462 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item) 463 drm_put_dev(dev); 464 } 465 DRM_INFO("Module unloaded\n"); 466 } 467 EXPORT_SYMBOL(drm_pci_exit); 468