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 unsigned long addr; 56 size_t sz; 57 58 /* pci_alloc_consistent only guarantees alignment to the smallest 59 * PAGE_SIZE order which is greater than or equal to the requested size. 60 * Return NULL here for now to make sure nobody tries for larger alignment 61 */ 62 if (align > size) 63 return NULL; 64 65 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); 66 if (!dmah) 67 return NULL; 68 69 dmah->size = size; 70 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); 71 72 if (dmah->vaddr == NULL) { 73 kfree(dmah); 74 return NULL; 75 } 76 77 memset(dmah->vaddr, 0, size); 78 79 /* XXX - Is virt_to_page() legal for consistent mem? */ 80 /* Reserve */ 81 for (addr = (unsigned long)dmah->vaddr, sz = size; 82 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 83 SetPageReserved(virt_to_page((void *)addr)); 84 } 85 86 return dmah; 87 } 88 89 EXPORT_SYMBOL(drm_pci_alloc); 90 91 /** 92 * \brief Free a PCI consistent memory block without freeing its descriptor. 93 * 94 * This function is for internal use in the Linux-specific DRM core code. 95 */ 96 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 97 { 98 unsigned long addr; 99 size_t sz; 100 101 if (dmah->vaddr) { 102 /* XXX - Is virt_to_page() legal for consistent mem? */ 103 /* Unreserve */ 104 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; 105 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 106 ClearPageReserved(virt_to_page((void *)addr)); 107 } 108 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 109 dmah->busaddr); 110 } 111 } 112 113 /** 114 * \brief Free a PCI consistent memory block 115 */ 116 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 117 { 118 __drm_pci_free(dev, dmah); 119 kfree(dmah); 120 } 121 122 EXPORT_SYMBOL(drm_pci_free); 123 124 #ifdef CONFIG_PCI 125 126 static int drm_get_pci_domain(struct drm_device *dev) 127 { 128 #ifndef __alpha__ 129 /* For historical reasons, drm_get_pci_domain() is busticated 130 * on most archs and has to remain so for userspace interface 131 * < 1.4, except on alpha which was right from the beginning 132 */ 133 if (dev->if_version < 0x10004) 134 return 0; 135 #endif /* __alpha__ */ 136 137 return pci_domain_nr(dev->pdev->bus); 138 } 139 140 static int drm_pci_get_irq(struct drm_device *dev) 141 { 142 return dev->pdev->irq; 143 } 144 145 static const char *drm_pci_get_name(struct drm_device *dev) 146 { 147 struct pci_driver *pdriver = dev->driver->kdriver.pci; 148 return pdriver->name; 149 } 150 151 static int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 152 { 153 int len, ret; 154 struct pci_driver *pdriver = dev->driver->kdriver.pci; 155 master->unique_len = 40; 156 master->unique_size = master->unique_len; 157 master->unique = kmalloc(master->unique_size, GFP_KERNEL); 158 if (master->unique == NULL) 159 return -ENOMEM; 160 161 162 len = snprintf(master->unique, master->unique_len, 163 "pci:%04x:%02x:%02x.%d", 164 drm_get_pci_domain(dev), 165 dev->pdev->bus->number, 166 PCI_SLOT(dev->pdev->devfn), 167 PCI_FUNC(dev->pdev->devfn)); 168 169 if (len >= master->unique_len) { 170 DRM_ERROR("buffer overflow"); 171 ret = -EINVAL; 172 goto err; 173 } else 174 master->unique_len = len; 175 176 dev->devname = 177 kmalloc(strlen(pdriver->name) + 178 master->unique_len + 2, GFP_KERNEL); 179 180 if (dev->devname == NULL) { 181 ret = -ENOMEM; 182 goto err; 183 } 184 185 sprintf(dev->devname, "%s@%s", pdriver->name, 186 master->unique); 187 188 return 0; 189 err: 190 return ret; 191 } 192 193 static int drm_pci_set_unique(struct drm_device *dev, 194 struct drm_master *master, 195 struct drm_unique *u) 196 { 197 int domain, bus, slot, func, ret; 198 const char *bus_name; 199 200 master->unique_len = u->unique_len; 201 master->unique_size = u->unique_len + 1; 202 master->unique = kmalloc(master->unique_size, GFP_KERNEL); 203 if (!master->unique) { 204 ret = -ENOMEM; 205 goto err; 206 } 207 208 if (copy_from_user(master->unique, u->unique, master->unique_len)) { 209 ret = -EFAULT; 210 goto err; 211 } 212 213 master->unique[master->unique_len] = '\0'; 214 215 bus_name = dev->driver->bus->get_name(dev); 216 dev->devname = kmalloc(strlen(bus_name) + 217 strlen(master->unique) + 2, GFP_KERNEL); 218 if (!dev->devname) { 219 ret = -ENOMEM; 220 goto err; 221 } 222 223 sprintf(dev->devname, "%s@%s", bus_name, 224 master->unique); 225 226 /* Return error if the busid submitted doesn't match the device's actual 227 * busid. 228 */ 229 ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func); 230 if (ret != 3) { 231 ret = -EINVAL; 232 goto err; 233 } 234 235 domain = bus >> 8; 236 bus &= 0xff; 237 238 if ((domain != drm_get_pci_domain(dev)) || 239 (bus != dev->pdev->bus->number) || 240 (slot != PCI_SLOT(dev->pdev->devfn)) || 241 (func != PCI_FUNC(dev->pdev->devfn))) { 242 ret = -EINVAL; 243 goto err; 244 } 245 return 0; 246 err: 247 return ret; 248 } 249 250 251 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) 252 { 253 if ((p->busnum >> 8) != drm_get_pci_domain(dev) || 254 (p->busnum & 0xff) != dev->pdev->bus->number || 255 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) 256 return -EINVAL; 257 258 p->irq = dev->pdev->irq; 259 260 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, 261 p->irq); 262 return 0; 263 } 264 265 static void drm_pci_agp_init(struct drm_device *dev) 266 { 267 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { 268 if (drm_pci_device_is_agp(dev)) 269 dev->agp = drm_agp_init(dev); 270 if (dev->agp) { 271 dev->agp->agp_mtrr = arch_phys_wc_add( 272 dev->agp->agp_info.aper_base, 273 dev->agp->agp_info.aper_size * 274 1024 * 1024); 275 } 276 } 277 } 278 279 void drm_pci_agp_destroy(struct drm_device *dev) 280 { 281 if (dev->agp) { 282 arch_phys_wc_del(dev->agp->agp_mtrr); 283 drm_agp_clear(dev); 284 kfree(dev->agp); 285 dev->agp = NULL; 286 } 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 }; 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 = drm_dev_alloc(driver, &pdev->dev); 318 if (!dev) 319 return -ENOMEM; 320 321 ret = pci_enable_device(pdev); 322 if (ret) 323 goto err_free; 324 325 dev->pdev = pdev; 326 #ifdef __alpha__ 327 dev->hose = pdev->sysdata; 328 #endif 329 330 if (drm_core_check_feature(dev, DRIVER_MODESET)) 331 pci_set_drvdata(pdev, dev); 332 333 drm_pci_agp_init(dev); 334 335 ret = drm_dev_register(dev, ent->driver_data); 336 if (ret) 337 goto err_agp; 338 339 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", 340 driver->name, driver->major, driver->minor, driver->patchlevel, 341 driver->date, pci_name(pdev), dev->primary->index); 342 343 /* No locking needed since shadow-attach is single-threaded since it may 344 * only be called from the per-driver module init hook. */ 345 if (!drm_core_check_feature(dev, DRIVER_MODESET)) 346 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list); 347 348 return 0; 349 350 err_agp: 351 drm_pci_agp_destroy(dev); 352 pci_disable_device(pdev); 353 err_free: 354 drm_dev_unref(dev); 355 return ret; 356 } 357 EXPORT_SYMBOL(drm_get_pci_dev); 358 359 /** 360 * PCI device initialization. Called direct from modules at load time. 361 * 362 * \return zero on success or a negative number on failure. 363 * 364 * Initializes a drm_device structures,registering the 365 * stubs and initializing the AGP device. 366 * 367 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and 368 * after the initialization for driver customization. 369 */ 370 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 371 { 372 struct pci_dev *pdev = NULL; 373 const struct pci_device_id *pid; 374 int i; 375 376 DRM_DEBUG("\n"); 377 378 driver->kdriver.pci = pdriver; 379 driver->bus = &drm_pci_bus; 380 381 if (driver->driver_features & DRIVER_MODESET) 382 return pci_register_driver(pdriver); 383 384 /* If not using KMS, fall back to stealth mode manual scanning. */ 385 INIT_LIST_HEAD(&driver->legacy_dev_list); 386 for (i = 0; pdriver->id_table[i].vendor != 0; i++) { 387 pid = &pdriver->id_table[i]; 388 389 /* Loop around setting up a DRM device for each PCI device 390 * matching our ID and device class. If we had the internal 391 * function that pci_get_subsys and pci_get_class used, we'd 392 * be able to just pass pid in instead of doing a two-stage 393 * thing. 394 */ 395 pdev = NULL; 396 while ((pdev = 397 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 398 pid->subdevice, pdev)) != NULL) { 399 if ((pdev->class & pid->class_mask) != pid->class) 400 continue; 401 402 /* stealth mode requires a manual probe */ 403 pci_dev_get(pdev); 404 drm_get_pci_dev(pdev, pid, driver); 405 } 406 } 407 return 0; 408 } 409 410 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask) 411 { 412 struct pci_dev *root; 413 u32 lnkcap, lnkcap2; 414 415 *mask = 0; 416 if (!dev->pdev) 417 return -EINVAL; 418 419 root = dev->pdev->bus->self; 420 421 /* we've been informed via and serverworks don't make the cut */ 422 if (root->vendor == PCI_VENDOR_ID_VIA || 423 root->vendor == PCI_VENDOR_ID_SERVERWORKS) 424 return -EINVAL; 425 426 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap); 427 pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2); 428 429 if (lnkcap2) { /* PCIe r3.0-compliant */ 430 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB) 431 *mask |= DRM_PCIE_SPEED_25; 432 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB) 433 *mask |= DRM_PCIE_SPEED_50; 434 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB) 435 *mask |= DRM_PCIE_SPEED_80; 436 } else { /* pre-r3.0 */ 437 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB) 438 *mask |= DRM_PCIE_SPEED_25; 439 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB) 440 *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50); 441 } 442 443 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2); 444 return 0; 445 } 446 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask); 447 448 #else 449 450 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 451 { 452 return -1; 453 } 454 455 void drm_pci_agp_destroy(struct drm_device *dev) {} 456 #endif 457 458 EXPORT_SYMBOL(drm_pci_init); 459 460 /*@}*/ 461 void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) 462 { 463 struct drm_device *dev, *tmp; 464 DRM_DEBUG("\n"); 465 466 if (driver->driver_features & DRIVER_MODESET) { 467 pci_unregister_driver(pdriver); 468 } else { 469 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list, 470 legacy_dev_list) { 471 list_del(&dev->legacy_dev_list); 472 drm_put_dev(dev); 473 } 474 } 475 DRM_INFO("Module unloaded\n"); 476 } 477 EXPORT_SYMBOL(drm_pci_exit); 478