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 #include "drm_internal.h" 31 #include "drm_legacy.h" 32 33 /** 34 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA. 35 * @dev: DRM device 36 * @size: size of block to allocate 37 * @align: alignment of block 38 * 39 * Return: A handle to the allocated memory block on success or NULL on 40 * failure. 41 */ 42 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) 43 { 44 drm_dma_handle_t *dmah; 45 unsigned long addr; 46 size_t sz; 47 48 /* pci_alloc_consistent only guarantees alignment to the smallest 49 * PAGE_SIZE order which is greater than or equal to the requested size. 50 * Return NULL here for now to make sure nobody tries for larger alignment 51 */ 52 if (align > size) 53 return NULL; 54 55 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); 56 if (!dmah) 57 return NULL; 58 59 dmah->size = size; 60 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); 61 62 if (dmah->vaddr == NULL) { 63 kfree(dmah); 64 return NULL; 65 } 66 67 memset(dmah->vaddr, 0, size); 68 69 /* XXX - Is virt_to_page() legal for consistent mem? */ 70 /* Reserve */ 71 for (addr = (unsigned long)dmah->vaddr, sz = size; 72 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 73 SetPageReserved(virt_to_page((void *)addr)); 74 } 75 76 return dmah; 77 } 78 79 EXPORT_SYMBOL(drm_pci_alloc); 80 81 /* 82 * Free a PCI consistent memory block without freeing its descriptor. 83 * 84 * This function is for internal use in the Linux-specific DRM core code. 85 */ 86 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 87 { 88 unsigned long addr; 89 size_t sz; 90 91 if (dmah->vaddr) { 92 /* XXX - Is virt_to_page() legal for consistent mem? */ 93 /* Unreserve */ 94 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; 95 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 96 ClearPageReserved(virt_to_page((void *)addr)); 97 } 98 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 99 dmah->busaddr); 100 } 101 } 102 103 /** 104 * drm_pci_free - Free a PCI consistent memory block 105 * @dev: DRM device 106 * @dmah: handle to memory block 107 */ 108 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 109 { 110 __drm_legacy_pci_free(dev, dmah); 111 kfree(dmah); 112 } 113 114 EXPORT_SYMBOL(drm_pci_free); 115 116 #ifdef CONFIG_PCI 117 118 static int drm_get_pci_domain(struct drm_device *dev) 119 { 120 #ifndef __alpha__ 121 /* For historical reasons, drm_get_pci_domain() is busticated 122 * on most archs and has to remain so for userspace interface 123 * < 1.4, except on alpha which was right from the beginning 124 */ 125 if (dev->if_version < 0x10004) 126 return 0; 127 #endif /* __alpha__ */ 128 129 return pci_domain_nr(dev->pdev->bus); 130 } 131 132 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 133 { 134 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", 135 drm_get_pci_domain(dev), 136 dev->pdev->bus->number, 137 PCI_SLOT(dev->pdev->devfn), 138 PCI_FUNC(dev->pdev->devfn)); 139 if (!master->unique) 140 return -ENOMEM; 141 142 master->unique_len = strlen(master->unique); 143 return 0; 144 } 145 EXPORT_SYMBOL(drm_pci_set_busid); 146 147 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) 148 { 149 if ((p->busnum >> 8) != drm_get_pci_domain(dev) || 150 (p->busnum & 0xff) != dev->pdev->bus->number || 151 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) 152 return -EINVAL; 153 154 p->irq = dev->pdev->irq; 155 156 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, 157 p->irq); 158 return 0; 159 } 160 161 /** 162 * drm_irq_by_busid - Get interrupt from bus ID 163 * @dev: DRM device 164 * @data: IOCTL parameter pointing to a drm_irq_busid structure 165 * @file_priv: DRM file private. 166 * 167 * Finds the PCI device with the specified bus id and gets its IRQ number. 168 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal 169 * to that of the device that this DRM instance attached to. 170 * 171 * Return: 0 on success or a negative error code on failure. 172 */ 173 int drm_irq_by_busid(struct drm_device *dev, void *data, 174 struct drm_file *file_priv) 175 { 176 struct drm_irq_busid *p = data; 177 178 if (!drm_core_check_feature(dev, DRIVER_LEGACY)) 179 return -EINVAL; 180 181 /* UMS was only ever support on PCI devices. */ 182 if (WARN_ON(!dev->pdev)) 183 return -EINVAL; 184 185 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) 186 return -EINVAL; 187 188 return drm_pci_irq_by_busid(dev, p); 189 } 190 191 static void drm_pci_agp_init(struct drm_device *dev) 192 { 193 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { 194 if (drm_pci_device_is_agp(dev)) 195 dev->agp = drm_agp_init(dev); 196 if (dev->agp) { 197 dev->agp->agp_mtrr = arch_phys_wc_add( 198 dev->agp->agp_info.aper_base, 199 dev->agp->agp_info.aper_size * 200 1024 * 1024); 201 } 202 } 203 } 204 205 void drm_pci_agp_destroy(struct drm_device *dev) 206 { 207 if (dev->agp) { 208 arch_phys_wc_del(dev->agp->agp_mtrr); 209 drm_legacy_agp_clear(dev); 210 kfree(dev->agp); 211 dev->agp = NULL; 212 } 213 } 214 215 /** 216 * drm_get_pci_dev - Register a PCI device with the DRM subsystem 217 * @pdev: PCI device 218 * @ent: entry from the PCI ID table that matches @pdev 219 * @driver: DRM device driver 220 * 221 * Attempt to gets inter module "drm" information. If we are first 222 * then register the character device and inter module information. 223 * Try and register, if we fail to register, backout previous work. 224 * 225 * NOTE: This function is deprecated, please use drm_dev_alloc() and 226 * drm_dev_register() instead and remove your ->load() callback. 227 * 228 * Return: 0 on success or a negative error code on failure. 229 */ 230 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, 231 struct drm_driver *driver) 232 { 233 struct drm_device *dev; 234 int ret; 235 236 DRM_DEBUG("\n"); 237 238 dev = drm_dev_alloc(driver, &pdev->dev); 239 if (IS_ERR(dev)) 240 return PTR_ERR(dev); 241 242 ret = pci_enable_device(pdev); 243 if (ret) 244 goto err_free; 245 246 dev->pdev = pdev; 247 #ifdef __alpha__ 248 dev->hose = pdev->sysdata; 249 #endif 250 251 if (drm_core_check_feature(dev, DRIVER_MODESET)) 252 pci_set_drvdata(pdev, dev); 253 254 drm_pci_agp_init(dev); 255 256 ret = drm_dev_register(dev, ent->driver_data); 257 if (ret) 258 goto err_agp; 259 260 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", 261 driver->name, driver->major, driver->minor, driver->patchlevel, 262 driver->date, pci_name(pdev), dev->primary->index); 263 264 /* No locking needed since shadow-attach is single-threaded since it may 265 * only be called from the per-driver module init hook. */ 266 if (drm_core_check_feature(dev, DRIVER_LEGACY)) 267 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list); 268 269 return 0; 270 271 err_agp: 272 drm_pci_agp_destroy(dev); 273 pci_disable_device(pdev); 274 err_free: 275 drm_dev_unref(dev); 276 return ret; 277 } 278 EXPORT_SYMBOL(drm_get_pci_dev); 279 280 /** 281 * drm_pci_init - Register matching PCI devices with the DRM subsystem 282 * @driver: DRM device driver 283 * @pdriver: PCI device driver 284 * 285 * Initializes a drm_device structures, registering the stubs and initializing 286 * the AGP device. 287 * 288 * NOTE: This function is deprecated. Modern modesetting drm drivers should use 289 * pci_register_driver() directly, this function only provides shadow-binding 290 * support for old legacy drivers on top of that core pci function. 291 * 292 * Return: 0 on success or a negative error code on failure. 293 */ 294 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 295 { 296 struct pci_dev *pdev = NULL; 297 const struct pci_device_id *pid; 298 int i; 299 300 DRM_DEBUG("\n"); 301 302 if (!(driver->driver_features & DRIVER_LEGACY)) 303 return pci_register_driver(pdriver); 304 305 /* If not using KMS, fall back to stealth mode manual scanning. */ 306 INIT_LIST_HEAD(&driver->legacy_dev_list); 307 for (i = 0; pdriver->id_table[i].vendor != 0; i++) { 308 pid = &pdriver->id_table[i]; 309 310 /* Loop around setting up a DRM device for each PCI device 311 * matching our ID and device class. If we had the internal 312 * function that pci_get_subsys and pci_get_class used, we'd 313 * be able to just pass pid in instead of doing a two-stage 314 * thing. 315 */ 316 pdev = NULL; 317 while ((pdev = 318 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 319 pid->subdevice, pdev)) != NULL) { 320 if ((pdev->class & pid->class_mask) != pid->class) 321 continue; 322 323 /* stealth mode requires a manual probe */ 324 pci_dev_get(pdev); 325 drm_get_pci_dev(pdev, pid, driver); 326 } 327 } 328 return 0; 329 } 330 331 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask) 332 { 333 struct pci_dev *root; 334 u32 lnkcap, lnkcap2; 335 336 *mask = 0; 337 if (!dev->pdev) 338 return -EINVAL; 339 340 root = dev->pdev->bus->self; 341 342 /* we've been informed via and serverworks don't make the cut */ 343 if (root->vendor == PCI_VENDOR_ID_VIA || 344 root->vendor == PCI_VENDOR_ID_SERVERWORKS) 345 return -EINVAL; 346 347 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap); 348 pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2); 349 350 if (lnkcap2) { /* PCIe r3.0-compliant */ 351 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB) 352 *mask |= DRM_PCIE_SPEED_25; 353 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB) 354 *mask |= DRM_PCIE_SPEED_50; 355 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB) 356 *mask |= DRM_PCIE_SPEED_80; 357 } else { /* pre-r3.0 */ 358 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB) 359 *mask |= DRM_PCIE_SPEED_25; 360 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB) 361 *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50); 362 } 363 364 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2); 365 return 0; 366 } 367 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask); 368 369 int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw) 370 { 371 struct pci_dev *root; 372 u32 lnkcap; 373 374 *mlw = 0; 375 if (!dev->pdev) 376 return -EINVAL; 377 378 root = dev->pdev->bus->self; 379 380 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap); 381 382 *mlw = (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4; 383 384 DRM_INFO("probing mlw for device %x:%x = %x\n", root->vendor, root->device, lnkcap); 385 return 0; 386 } 387 EXPORT_SYMBOL(drm_pcie_get_max_link_width); 388 389 #else 390 391 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 392 { 393 return -1; 394 } 395 396 void drm_pci_agp_destroy(struct drm_device *dev) {} 397 398 int drm_irq_by_busid(struct drm_device *dev, void *data, 399 struct drm_file *file_priv) 400 { 401 return -EINVAL; 402 } 403 #endif 404 405 EXPORT_SYMBOL(drm_pci_init); 406 407 /** 408 * drm_pci_exit - Unregister matching PCI devices from the DRM subsystem 409 * @driver: DRM device driver 410 * @pdriver: PCI device driver 411 * 412 * Unregisters one or more devices matched by a PCI driver from the DRM 413 * subsystem. 414 * 415 * NOTE: This function is deprecated. Modern modesetting drm drivers should use 416 * pci_unregister_driver() directly, this function only provides shadow-binding 417 * support for old legacy drivers on top of that core pci function. 418 */ 419 void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) 420 { 421 struct drm_device *dev, *tmp; 422 DRM_DEBUG("\n"); 423 424 if (!(driver->driver_features & DRIVER_LEGACY)) { 425 pci_unregister_driver(pdriver); 426 } else { 427 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list, 428 legacy_dev_list) { 429 list_del(&dev->legacy_dev_list); 430 drm_put_dev(dev); 431 } 432 } 433 DRM_INFO("Module unloaded\n"); 434 } 435 EXPORT_SYMBOL(drm_pci_exit); 436