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 <linux/export.h> 43 #include <drm/drmP.h> 44 45 /**********************************************************************/ 46 /** \name PCI memory */ 47 /*@{*/ 48 49 /** 50 * \brief Allocate a PCI consistent memory block, for DMA. 51 */ 52 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) 53 { 54 drm_dma_handle_t *dmah; 55 #if 1 56 unsigned long addr; 57 size_t sz; 58 #endif 59 60 /* pci_alloc_consistent only guarantees alignment to the smallest 61 * PAGE_SIZE order which is greater than or equal to the requested size. 62 * Return NULL here for now to make sure nobody tries for larger alignment 63 */ 64 if (align > size) 65 return NULL; 66 67 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); 68 if (!dmah) 69 return NULL; 70 71 dmah->size = size; 72 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); 73 74 if (dmah->vaddr == NULL) { 75 kfree(dmah); 76 return NULL; 77 } 78 79 memset(dmah->vaddr, 0, size); 80 81 /* XXX - Is virt_to_page() legal for consistent mem? */ 82 /* Reserve */ 83 for (addr = (unsigned long)dmah->vaddr, sz = size; 84 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 85 SetPageReserved(virt_to_page(addr)); 86 } 87 88 return dmah; 89 } 90 91 EXPORT_SYMBOL(drm_pci_alloc); 92 93 /** 94 * \brief Free a PCI consistent memory block without freeing its descriptor. 95 * 96 * This function is for internal use in the Linux-specific DRM core code. 97 */ 98 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 99 { 100 #if 1 101 unsigned long addr; 102 size_t sz; 103 #endif 104 105 if (dmah->vaddr) { 106 /* XXX - Is virt_to_page() legal for consistent mem? */ 107 /* Unreserve */ 108 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; 109 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 110 ClearPageReserved(virt_to_page(addr)); 111 } 112 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 113 dmah->busaddr); 114 } 115 } 116 117 /** 118 * \brief Free a PCI consistent memory block 119 */ 120 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 121 { 122 __drm_pci_free(dev, dmah); 123 kfree(dmah); 124 } 125 126 EXPORT_SYMBOL(drm_pci_free); 127 128 #ifdef CONFIG_PCI 129 130 static int drm_get_pci_domain(struct drm_device *dev) 131 { 132 #ifndef __alpha__ 133 /* For historical reasons, drm_get_pci_domain() is busticated 134 * on most archs and has to remain so for userspace interface 135 * < 1.4, except on alpha which was right from the beginning 136 */ 137 if (dev->if_version < 0x10004) 138 return 0; 139 #endif /* __alpha__ */ 140 141 return pci_domain_nr(dev->pdev->bus); 142 } 143 144 static int drm_pci_get_irq(struct drm_device *dev) 145 { 146 return dev->pdev->irq; 147 } 148 149 static const char *drm_pci_get_name(struct drm_device *dev) 150 { 151 struct pci_driver *pdriver = dev->driver->kdriver.pci; 152 return pdriver->name; 153 } 154 155 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 156 { 157 int len, ret; 158 struct pci_driver *pdriver = dev->driver->kdriver.pci; 159 master->unique_len = 40; 160 master->unique_size = master->unique_len; 161 master->unique = kmalloc(master->unique_size, GFP_KERNEL); 162 if (master->unique == NULL) 163 return -ENOMEM; 164 165 166 len = snprintf(master->unique, master->unique_len, 167 "pci:%04x:%02x:%02x.%d", 168 drm_get_pci_domain(dev), 169 dev->pdev->bus->number, 170 PCI_SLOT(dev->pdev->devfn), 171 PCI_FUNC(dev->pdev->devfn)); 172 173 if (len >= master->unique_len) { 174 DRM_ERROR("buffer overflow"); 175 ret = -EINVAL; 176 goto err; 177 } else 178 master->unique_len = len; 179 180 size_t devlen = strlen(pdriver->name) + master->unique_len + 2; 181 dev->devname = kmalloc(dev->devlen, GFP_KERNEL); 182 183 if (dev->devname == NULL) { 184 ret = -ENOMEM; 185 goto err; 186 } 187 188 snprintf(dev->devname, devlen, "%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 size_t devlen = strlen(bus_name) + strlen(master->unique) + 2; 220 dev->devname = kmalloc(devlen, GFP_KERNEL); 221 if (!dev->devname) { 222 ret = -ENOMEM; 223 goto err; 224 } 225 226 snprintf(dev->devname, devlen, "%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 static 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 .irq_by_busid = drm_pci_irq_by_busid, 296 .agp_init = drm_pci_agp_init, 297 }; 298 299 /** 300 * Register. 301 * 302 * \param pdev - PCI device structure 303 * \param ent entry from the PCI ID table with device type flags 304 * \return zero on success or a negative number on failure. 305 * 306 * Attempt to gets inter module "drm" information. If we are first 307 * then register the character device and inter module information. 308 * Try and register, if we fail to register, backout previous work. 309 */ 310 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, 311 struct drm_driver *driver) 312 { 313 struct drm_device *dev; 314 int ret; 315 316 DRM_DEBUG("\n"); 317 318 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 319 if (!dev) 320 return -ENOMEM; 321 322 ret = pci_enable_device(pdev); 323 if (ret) 324 goto err_g1; 325 326 dev->pdev = pdev; 327 dev->dev = &pdev->dev; 328 329 dev->pci_device = pdev->device; 330 dev->pci_vendor = pdev->vendor; 331 332 #ifdef __alpha__ 333 dev->hose = pdev->sysdata; 334 #endif 335 336 mutex_lock(&drm_global_mutex); 337 338 if ((ret = drm_fill_in_dev(dev, ent, driver))) { 339 printk(KERN_ERR "DRM: Fill_in_dev failed.\n"); 340 goto err_g2; 341 } 342 343 if (drm_core_check_feature(dev, DRIVER_MODESET)) { 344 pci_set_drvdata(pdev, dev); 345 ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL); 346 if (ret) 347 goto err_g2; 348 } 349 350 if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY))) 351 goto err_g3; 352 353 if (dev->driver->load) { 354 ret = dev->driver->load(dev, ent->driver_data); 355 if (ret) 356 goto err_g4; 357 } 358 359 /* setup the grouping for the legacy output */ 360 if (drm_core_check_feature(dev, DRIVER_MODESET)) { 361 ret = drm_mode_group_init_legacy_group(dev, 362 &dev->primary->mode_group); 363 if (ret) 364 goto err_g4; 365 } 366 367 list_add_tail(&dev->driver_item, &driver->device_list); 368 369 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", 370 driver->name, driver->major, driver->minor, driver->patchlevel, 371 driver->date, pci_name(pdev), dev->primary->index); 372 373 mutex_unlock(&drm_global_mutex); 374 return 0; 375 376 err_g4: 377 drm_put_minor(&dev->primary); 378 err_g3: 379 if (drm_core_check_feature(dev, DRIVER_MODESET)) 380 drm_put_minor(&dev->control); 381 err_g2: 382 pci_disable_device(pdev); 383 err_g1: 384 kfree(dev); 385 mutex_unlock(&drm_global_mutex); 386 return ret; 387 } 388 EXPORT_SYMBOL(drm_get_pci_dev); 389 390 /** 391 * PCI device initialization. Called direct from modules at load time. 392 * 393 * \return zero on success or a negative number on failure. 394 * 395 * Initializes a drm_device structures,registering the 396 * stubs and initializing the AGP device. 397 * 398 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and 399 * after the initialization for driver customization. 400 */ 401 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 402 { 403 struct pci_dev *pdev = NULL; 404 const struct pci_device_id *pid; 405 int i; 406 407 DRM_DEBUG("\n"); 408 409 INIT_LIST_HEAD(&driver->device_list); 410 driver->kdriver.pci = pdriver; 411 driver->bus = &drm_pci_bus; 412 413 if (driver->driver_features & DRIVER_MODESET) 414 return pci_register_driver(pdriver); 415 416 /* If not using KMS, fall back to stealth mode manual scanning. */ 417 for (i = 0; pdriver->id_table[i].vendor != 0; i++) { 418 pid = &pdriver->id_table[i]; 419 420 /* Loop around setting up a DRM device for each PCI device 421 * matching our ID and device class. If we had the internal 422 * function that pci_get_subsys and pci_get_class used, we'd 423 * be able to just pass pid in instead of doing a two-stage 424 * thing. 425 */ 426 pdev = NULL; 427 while ((pdev = 428 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 429 pid->subdevice, pdev)) != NULL) { 430 if ((pdev->class & pid->class_mask) != pid->class) 431 continue; 432 433 /* stealth mode requires a manual probe */ 434 pci_dev_get(pdev); 435 drm_get_pci_dev(pdev, pid, driver); 436 } 437 } 438 return 0; 439 } 440 441 #else 442 443 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 444 { 445 return -1; 446 } 447 448 #endif 449 450 EXPORT_SYMBOL(drm_pci_init); 451 452 /*@}*/ 453 void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) 454 { 455 struct drm_device *dev, *tmp; 456 DRM_DEBUG("\n"); 457 458 if (driver->driver_features & DRIVER_MODESET) { 459 pci_unregister_driver(pdriver); 460 } else { 461 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item) 462 drm_put_dev(dev); 463 } 464 DRM_INFO("Module unloaded\n"); 465 } 466 EXPORT_SYMBOL(drm_pci_exit); 467 468 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask) 469 { 470 struct pci_dev *root; 471 int pos; 472 u32 lnkcap = 0, lnkcap2 = 0; 473 474 *mask = 0; 475 if (!dev->pdev) 476 return -EINVAL; 477 478 if (!pci_is_pcie(dev->pdev)) 479 return -EINVAL; 480 481 root = dev->pdev->bus->self; 482 483 pos = pci_pcie_cap(root); 484 if (!pos) 485 return -EINVAL; 486 487 /* we've been informed via and serverworks don't make the cut */ 488 if (root->vendor == PCI_VENDOR_ID_VIA || 489 root->vendor == PCI_VENDOR_ID_SERVERWORKS) 490 return -EINVAL; 491 492 pci_read_config_dword(root, pos + PCI_EXP_LNKCAP, &lnkcap); 493 pci_read_config_dword(root, pos + PCI_EXP_LNKCAP2, &lnkcap2); 494 495 lnkcap &= PCI_EXP_LNKCAP_SLS; 496 lnkcap2 &= 0xfe; 497 498 if (lnkcap2) { /* PCIE GEN 3.0 */ 499 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB) 500 *mask |= DRM_PCIE_SPEED_25; 501 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB) 502 *mask |= DRM_PCIE_SPEED_50; 503 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB) 504 *mask |= DRM_PCIE_SPEED_80; 505 } else { 506 if (lnkcap & 1) 507 *mask |= DRM_PCIE_SPEED_25; 508 if (lnkcap & 2) 509 *mask |= DRM_PCIE_SPEED_50; 510 } 511 512 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2); 513 return 0; 514 } 515 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask); 516