| 1 | /* |
| 2 | * Copyright 2003 José Fonseca. |
| 3 | * Copyright 2003 Leif Delgass. |
| 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 7 | * copy of this software and associated documentation files (the "Software"), |
| 8 | * to deal in the Software without restriction, including without limitation |
| 9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 10 | * and/or sell copies of the Software, and to permit persons to whom the |
| 11 | * Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice (including the next |
| 14 | * paragraph) shall be included in all copies or substantial portions of the |
| 15 | * Software. |
| 16 | * |
| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 20 | * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 21 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| 22 | * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 23 | */ |
| 24 | |
| 25 | #include <linux/pci.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/dma-mapping.h> |
| 28 | #include <linux/export.h> |
| 29 | #include <drm/drmP.h> |
| 30 | |
| 31 | /** |
| 32 | * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA. |
| 33 | * @dev: DRM device |
| 34 | * @size: size of block to allocate |
| 35 | * @align: alignment of block |
| 36 | * |
| 37 | * Return: A handle to the allocated memory block on success or NULL on |
| 38 | * failure. |
| 39 | */ |
| 40 | drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) |
| 41 | { |
| 42 | drm_dma_handle_t *dmah; |
| 43 | unsigned long addr; |
| 44 | size_t sz; |
| 45 | |
| 46 | /* pci_alloc_consistent only guarantees alignment to the smallest |
| 47 | * PAGE_SIZE order which is greater than or equal to the requested size. |
| 48 | * Return NULL here for now to make sure nobody tries for larger alignment |
| 49 | */ |
| 50 | if (align > size) |
| 51 | return NULL; |
| 52 | |
| 53 | dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); |
| 54 | if (!dmah) |
| 55 | return NULL; |
| 56 | |
| 57 | dmah->size = size; |
| 58 | dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); |
| 59 | |
| 60 | if (dmah->vaddr == NULL) { |
| 61 | kfree(dmah); |
| 62 | return NULL; |
| 63 | } |
| 64 | |
| 65 | memset(dmah->vaddr, 0, size); |
| 66 | |
| 67 | /* XXX - Is virt_to_page() legal for consistent mem? */ |
| 68 | /* Reserve */ |
| 69 | for (addr = (unsigned long)dmah->vaddr, sz = size; |
| 70 | sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { |
| 71 | SetPageReserved(virt_to_page((void *)addr)); |
| 72 | } |
| 73 | |
| 74 | return dmah; |
| 75 | } |
| 76 | |
| 77 | EXPORT_SYMBOL(drm_pci_alloc); |
| 78 | |
| 79 | /* |
| 80 | * Free a PCI consistent memory block without freeing its descriptor. |
| 81 | * |
| 82 | * This function is for internal use in the Linux-specific DRM core code. |
| 83 | */ |
| 84 | void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) |
| 85 | { |
| 86 | unsigned long addr; |
| 87 | size_t sz; |
| 88 | |
| 89 | if (dmah->vaddr) { |
| 90 | /* XXX - Is virt_to_page() legal for consistent mem? */ |
| 91 | /* Unreserve */ |
| 92 | for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; |
| 93 | sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { |
| 94 | ClearPageReserved(virt_to_page((void *)addr)); |
| 95 | } |
| 96 | dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, |
| 97 | dmah->busaddr); |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * drm_pci_free - Free a PCI consistent memory block |
| 103 | * @dev: DRM device |
| 104 | * @dmah: handle to memory block |
| 105 | */ |
| 106 | void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) |
| 107 | { |
| 108 | __drm_pci_free(dev, dmah); |
| 109 | kfree(dmah); |
| 110 | } |
| 111 | |
| 112 | EXPORT_SYMBOL(drm_pci_free); |
| 113 | |
| 114 | #ifdef CONFIG_PCI |
| 115 | |
| 116 | static int drm_get_pci_domain(struct drm_device *dev) |
| 117 | { |
| 118 | #ifndef __alpha__ |
| 119 | /* For historical reasons, drm_get_pci_domain() is busticated |
| 120 | * on most archs and has to remain so for userspace interface |
| 121 | * < 1.4, except on alpha which was right from the beginning |
| 122 | */ |
| 123 | if (dev->if_version < 0x10004) |
| 124 | return 0; |
| 125 | #endif /* __alpha__ */ |
| 126 | |
| 127 | return pci_domain_nr(dev->pdev->bus); |
| 128 | } |
| 129 | |
| 130 | static int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) |
| 131 | { |
| 132 | master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", |
| 133 | drm_get_pci_domain(dev), |
| 134 | dev->pdev->bus->number, |
| 135 | PCI_SLOT(dev->pdev->devfn), |
| 136 | PCI_FUNC(dev->pdev->devfn)); |
| 137 | if (!master->unique) |
| 138 | return -ENOMEM; |
| 139 | |
| 140 | master->unique_len = strlen(master->unique); |
| 141 | master->unique_size = master->unique_len + 1; |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | int drm_pci_set_unique(struct drm_device *dev, |
| 146 | struct drm_master *master, |
| 147 | struct drm_unique *u) |
| 148 | { |
| 149 | int domain, bus, slot, func, ret; |
| 150 | |
| 151 | master->unique_len = u->unique_len; |
| 152 | master->unique_size = u->unique_len + 1; |
| 153 | master->unique = kmalloc(master->unique_size, GFP_KERNEL); |
| 154 | if (!master->unique) { |
| 155 | ret = -ENOMEM; |
| 156 | goto err; |
| 157 | } |
| 158 | |
| 159 | if (copy_from_user(master->unique, u->unique, master->unique_len)) { |
| 160 | ret = -EFAULT; |
| 161 | goto err; |
| 162 | } |
| 163 | |
| 164 | master->unique[master->unique_len] = '\0'; |
| 165 | |
| 166 | /* Return error if the busid submitted doesn't match the device's actual |
| 167 | * busid. |
| 168 | */ |
| 169 | ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func); |
| 170 | if (ret != 3) { |
| 171 | ret = -EINVAL; |
| 172 | goto err; |
| 173 | } |
| 174 | |
| 175 | domain = bus >> 8; |
| 176 | bus &= 0xff; |
| 177 | |
| 178 | if ((domain != drm_get_pci_domain(dev)) || |
| 179 | (bus != dev->pdev->bus->number) || |
| 180 | (slot != PCI_SLOT(dev->pdev->devfn)) || |
| 181 | (func != PCI_FUNC(dev->pdev->devfn))) { |
| 182 | ret = -EINVAL; |
| 183 | goto err; |
| 184 | } |
| 185 | return 0; |
| 186 | err: |
| 187 | return ret; |
| 188 | } |
| 189 | |
| 190 | static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) |
| 191 | { |
| 192 | if ((p->busnum >> 8) != drm_get_pci_domain(dev) || |
| 193 | (p->busnum & 0xff) != dev->pdev->bus->number || |
| 194 | p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) |
| 195 | return -EINVAL; |
| 196 | |
| 197 | p->irq = dev->pdev->irq; |
| 198 | |
| 199 | DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, |
| 200 | p->irq); |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | /** |
| 205 | * drm_irq_by_busid - Get interrupt from bus ID |
| 206 | * @dev: DRM device |
| 207 | * @data: IOCTL parameter pointing to a drm_irq_busid structure |
| 208 | * @file_priv: DRM file private. |
| 209 | * |
| 210 | * Finds the PCI device with the specified bus id and gets its IRQ number. |
| 211 | * This IOCTL is deprecated, and will now return EINVAL for any busid not equal |
| 212 | * to that of the device that this DRM instance attached to. |
| 213 | * |
| 214 | * Return: 0 on success or a negative error code on failure. |
| 215 | */ |
| 216 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
| 217 | struct drm_file *file_priv) |
| 218 | { |
| 219 | struct drm_irq_busid *p = data; |
| 220 | |
| 221 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
| 222 | return -EINVAL; |
| 223 | |
| 224 | /* UMS was only ever support on PCI devices. */ |
| 225 | if (WARN_ON(!dev->pdev)) |
| 226 | return -EINVAL; |
| 227 | |
| 228 | if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
| 229 | return -EINVAL; |
| 230 | |
| 231 | return drm_pci_irq_by_busid(dev, p); |
| 232 | } |
| 233 | |
| 234 | static void drm_pci_agp_init(struct drm_device *dev) |
| 235 | { |
| 236 | if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { |
| 237 | if (drm_pci_device_is_agp(dev)) |
| 238 | dev->agp = drm_agp_init(dev); |
| 239 | if (dev->agp) { |
| 240 | dev->agp->agp_mtrr = arch_phys_wc_add( |
| 241 | dev->agp->agp_info.aper_base, |
| 242 | dev->agp->agp_info.aper_size * |
| 243 | 1024 * 1024); |
| 244 | } |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | void drm_pci_agp_destroy(struct drm_device *dev) |
| 249 | { |
| 250 | if (dev->agp) { |
| 251 | arch_phys_wc_del(dev->agp->agp_mtrr); |
| 252 | drm_agp_clear(dev); |
| 253 | kfree(dev->agp); |
| 254 | dev->agp = NULL; |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | static struct drm_bus drm_pci_bus = { |
| 259 | .set_busid = drm_pci_set_busid, |
| 260 | }; |
| 261 | |
| 262 | /** |
| 263 | * drm_get_pci_dev - Register a PCI device with the DRM subsystem |
| 264 | * @pdev: PCI device |
| 265 | * @ent: entry from the PCI ID table that matches @pdev |
| 266 | * @driver: DRM device driver |
| 267 | * |
| 268 | * Attempt to gets inter module "drm" information. If we are first |
| 269 | * then register the character device and inter module information. |
| 270 | * Try and register, if we fail to register, backout previous work. |
| 271 | * |
| 272 | * Return: 0 on success or a negative error code on failure. |
| 273 | */ |
| 274 | int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, |
| 275 | struct drm_driver *driver) |
| 276 | { |
| 277 | struct drm_device *dev; |
| 278 | int ret; |
| 279 | |
| 280 | DRM_DEBUG("\n"); |
| 281 | |
| 282 | dev = drm_dev_alloc(driver, &pdev->dev); |
| 283 | if (!dev) |
| 284 | return -ENOMEM; |
| 285 | |
| 286 | ret = pci_enable_device(pdev); |
| 287 | if (ret) |
| 288 | goto err_free; |
| 289 | |
| 290 | dev->pdev = pdev; |
| 291 | #ifdef __alpha__ |
| 292 | dev->hose = pdev->sysdata; |
| 293 | #endif |
| 294 | |
| 295 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
| 296 | pci_set_drvdata(pdev, dev); |
| 297 | |
| 298 | drm_pci_agp_init(dev); |
| 299 | |
| 300 | ret = drm_dev_register(dev, ent->driver_data); |
| 301 | if (ret) |
| 302 | goto err_agp; |
| 303 | |
| 304 | DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", |
| 305 | driver->name, driver->major, driver->minor, driver->patchlevel, |
| 306 | driver->date, pci_name(pdev), dev->primary->index); |
| 307 | |
| 308 | /* No locking needed since shadow-attach is single-threaded since it may |
| 309 | * only be called from the per-driver module init hook. */ |
| 310 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| 311 | list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list); |
| 312 | |
| 313 | return 0; |
| 314 | |
| 315 | err_agp: |
| 316 | drm_pci_agp_destroy(dev); |
| 317 | pci_disable_device(pdev); |
| 318 | err_free: |
| 319 | drm_dev_unref(dev); |
| 320 | return ret; |
| 321 | } |
| 322 | EXPORT_SYMBOL(drm_get_pci_dev); |
| 323 | |
| 324 | /** |
| 325 | * drm_pci_init - Register matching PCI devices with the DRM subsystem |
| 326 | * @driver: DRM device driver |
| 327 | * @pdriver: PCI device driver |
| 328 | * |
| 329 | * Initializes a drm_device structures, registering the stubs and initializing |
| 330 | * the AGP device. |
| 331 | * |
| 332 | * Return: 0 on success or a negative error code on failure. |
| 333 | */ |
| 334 | int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) |
| 335 | { |
| 336 | struct pci_dev *pdev = NULL; |
| 337 | const struct pci_device_id *pid; |
| 338 | int i; |
| 339 | |
| 340 | DRM_DEBUG("\n"); |
| 341 | |
| 342 | driver->bus = &drm_pci_bus; |
| 343 | |
| 344 | if (driver->driver_features & DRIVER_MODESET) |
| 345 | return pci_register_driver(pdriver); |
| 346 | |
| 347 | /* If not using KMS, fall back to stealth mode manual scanning. */ |
| 348 | INIT_LIST_HEAD(&driver->legacy_dev_list); |
| 349 | for (i = 0; pdriver->id_table[i].vendor != 0; i++) { |
| 350 | pid = &pdriver->id_table[i]; |
| 351 | |
| 352 | /* Loop around setting up a DRM device for each PCI device |
| 353 | * matching our ID and device class. If we had the internal |
| 354 | * function that pci_get_subsys and pci_get_class used, we'd |
| 355 | * be able to just pass pid in instead of doing a two-stage |
| 356 | * thing. |
| 357 | */ |
| 358 | pdev = NULL; |
| 359 | while ((pdev = |
| 360 | pci_get_subsys(pid->vendor, pid->device, pid->subvendor, |
| 361 | pid->subdevice, pdev)) != NULL) { |
| 362 | if ((pdev->class & pid->class_mask) != pid->class) |
| 363 | continue; |
| 364 | |
| 365 | /* stealth mode requires a manual probe */ |
| 366 | pci_dev_get(pdev); |
| 367 | drm_get_pci_dev(pdev, pid, driver); |
| 368 | } |
| 369 | } |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask) |
| 374 | { |
| 375 | struct pci_dev *root; |
| 376 | u32 lnkcap, lnkcap2; |
| 377 | |
| 378 | *mask = 0; |
| 379 | if (!dev->pdev) |
| 380 | return -EINVAL; |
| 381 | |
| 382 | root = dev->pdev->bus->self; |
| 383 | |
| 384 | /* we've been informed via and serverworks don't make the cut */ |
| 385 | if (root->vendor == PCI_VENDOR_ID_VIA || |
| 386 | root->vendor == PCI_VENDOR_ID_SERVERWORKS) |
| 387 | return -EINVAL; |
| 388 | |
| 389 | pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap); |
| 390 | pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2); |
| 391 | |
| 392 | if (lnkcap2) { /* PCIe r3.0-compliant */ |
| 393 | if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB) |
| 394 | *mask |= DRM_PCIE_SPEED_25; |
| 395 | if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB) |
| 396 | *mask |= DRM_PCIE_SPEED_50; |
| 397 | if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB) |
| 398 | *mask |= DRM_PCIE_SPEED_80; |
| 399 | } else { /* pre-r3.0 */ |
| 400 | if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB) |
| 401 | *mask |= DRM_PCIE_SPEED_25; |
| 402 | if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB) |
| 403 | *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50); |
| 404 | } |
| 405 | |
| 406 | DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2); |
| 407 | return 0; |
| 408 | } |
| 409 | EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask); |
| 410 | |
| 411 | #else |
| 412 | |
| 413 | int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) |
| 414 | { |
| 415 | return -1; |
| 416 | } |
| 417 | |
| 418 | void drm_pci_agp_destroy(struct drm_device *dev) {} |
| 419 | |
| 420 | int drm_irq_by_busid(struct drm_device *dev, void *data, |
| 421 | struct drm_file *file_priv) |
| 422 | { |
| 423 | return -EINVAL; |
| 424 | } |
| 425 | |
| 426 | int drm_pci_set_unique(struct drm_device *dev, |
| 427 | struct drm_master *master, |
| 428 | struct drm_unique *u) |
| 429 | { |
| 430 | return -EINVAL; |
| 431 | } |
| 432 | #endif |
| 433 | |
| 434 | EXPORT_SYMBOL(drm_pci_init); |
| 435 | |
| 436 | /** |
| 437 | * drm_pci_exit - Unregister matching PCI devices from the DRM subsystem |
| 438 | * @driver: DRM device driver |
| 439 | * @pdriver: PCI device driver |
| 440 | * |
| 441 | * Unregisters one or more devices matched by a PCI driver from the DRM |
| 442 | * subsystem. |
| 443 | */ |
| 444 | void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) |
| 445 | { |
| 446 | struct drm_device *dev, *tmp; |
| 447 | DRM_DEBUG("\n"); |
| 448 | |
| 449 | if (driver->driver_features & DRIVER_MODESET) { |
| 450 | pci_unregister_driver(pdriver); |
| 451 | } else { |
| 452 | list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list, |
| 453 | legacy_dev_list) { |
| 454 | list_del(&dev->legacy_dev_list); |
| 455 | drm_put_dev(dev); |
| 456 | } |
| 457 | } |
| 458 | DRM_INFO("Module unloaded\n"); |
| 459 | } |
| 460 | EXPORT_SYMBOL(drm_pci_exit); |