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/drm_pci.h> 30 #include <drm/drmP.h> 31 #include "drm_internal.h" 32 #include "drm_legacy.h" 33 34 /** 35 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA. 36 * @dev: DRM device 37 * @size: size of block to allocate 38 * @align: alignment of block 39 * 40 * FIXME: This is a needless abstraction of the Linux dma-api and should be 41 * removed. 42 * 43 * Return: A handle to the allocated memory block on success or NULL on 44 * failure. 45 */ 46 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) 47 { 48 drm_dma_handle_t *dmah; 49 unsigned long addr; 50 size_t sz; 51 52 /* pci_alloc_consistent only guarantees alignment to the smallest 53 * PAGE_SIZE order which is greater than or equal to the requested size. 54 * Return NULL here for now to make sure nobody tries for larger alignment 55 */ 56 if (align > size) 57 return NULL; 58 59 dmah = kmalloc(sizeof(drm_dma_handle_t), M_DRM, GFP_KERNEL); 60 if (!dmah) 61 return NULL; 62 63 dmah->size = size; 64 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL); 65 66 if (dmah->vaddr == NULL) { 67 kfree(dmah); 68 return NULL; 69 } 70 71 memset(dmah->vaddr, 0, size); 72 73 /* XXX - Is virt_to_page() legal for consistent mem? */ 74 /* Reserve */ 75 for (addr = (unsigned long)dmah->vaddr, sz = size; 76 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 77 #if 0 78 SetPageReserved(virt_to_page((void *)addr)); 79 #endif 80 } 81 82 return dmah; 83 } 84 85 EXPORT_SYMBOL(drm_pci_alloc); 86 87 /* 88 * Free a PCI consistent memory block without freeing its descriptor. 89 * 90 * This function is for internal use in the Linux-specific DRM core code. 91 */ 92 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 93 { 94 unsigned long addr; 95 size_t sz; 96 97 if (dmah->vaddr) { 98 /* XXX - Is virt_to_page() legal for consistent mem? */ 99 /* Unreserve */ 100 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; 101 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 102 #if 0 103 ClearPageReserved(virt_to_page((void *)addr)); 104 #endif 105 } 106 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 107 dmah->busaddr); 108 } 109 } 110 111 /** 112 * drm_pci_free - Free a PCI consistent memory block 113 * @dev: DRM device 114 * @dmah: handle to memory block 115 * 116 * FIXME: This is a needless abstraction of the Linux dma-api and should be 117 * removed. 118 */ 119 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 120 { 121 __drm_legacy_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 #if 0 141 return pci_domain_nr(dev->pdev->bus); 142 #else 143 return dev->pci_domain; 144 #endif 145 } 146 147 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 148 { 149 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", 150 drm_get_pci_domain(dev), 151 dev->pdev->bus->number, 152 PCI_SLOT(dev->pdev->devfn), 153 PCI_FUNC(dev->pdev->devfn)); 154 if (!master->unique) 155 return -ENOMEM; 156 157 master->unique_len = strlen(master->unique); 158 return 0; 159 } 160 161 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p) 162 { 163 if ((p->busnum >> 8) != drm_get_pci_domain(dev) || 164 (p->busnum & 0xff) != dev->pdev->bus->number || 165 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) 166 return -EINVAL; 167 168 p->irq = dev->pdev->irq; 169 170 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, 171 p->irq); 172 return 0; 173 } 174 175 /** 176 * drm_irq_by_busid - Get interrupt from bus ID 177 * @dev: DRM device 178 * @data: IOCTL parameter pointing to a drm_irq_busid structure 179 * @file_priv: DRM file private. 180 * 181 * Finds the PCI device with the specified bus id and gets its IRQ number. 182 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal 183 * to that of the device that this DRM instance attached to. 184 * 185 * Return: 0 on success or a negative error code on failure. 186 */ 187 int drm_irq_by_busid(struct drm_device *dev, void *data, 188 struct drm_file *file_priv) 189 { 190 struct drm_irq_busid *p = data; 191 192 if (!drm_core_check_feature(dev, DRIVER_LEGACY)) 193 return -EINVAL; 194 195 /* UMS was only ever support on PCI devices. */ 196 if (WARN_ON(!dev->pdev)) 197 return -EINVAL; 198 199 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) 200 return -EINVAL; 201 202 return drm_pci_irq_by_busid(dev, p); 203 } 204 205 #ifdef __DragonFly__ 206 int 207 drm_getpciinfo(struct drm_device *dev, void *data, struct drm_file *file_priv) 208 { 209 struct drm_pciinfo *info = data; 210 211 info->domain = 0; 212 info->bus = dev->pci_bus; 213 info->dev = PCI_SLOT(dev->pdev->devfn); 214 info->func = PCI_FUNC(dev->pdev->devfn); 215 info->vendor_id = dev->pdev->vendor; 216 info->device_id = dev->pdev->device; 217 info->subvendor_id = dev->pdev->subsystem_vendor; 218 info->subdevice_id = dev->pdev->subsystem_device; 219 info->revision_id = 0; 220 221 return 0; 222 } 223 #endif 224 225 /** 226 * drm_get_pci_dev - Register a PCI device with the DRM subsystem 227 * @pdev: PCI device 228 * @ent: entry from the PCI ID table that matches @pdev 229 * @driver: DRM device driver 230 * 231 * Attempt to gets inter module "drm" information. If we are first 232 * then register the character device and inter module information. 233 * Try and register, if we fail to register, backout previous work. 234 * 235 * NOTE: This function is deprecated, please use drm_dev_alloc() and 236 * drm_dev_register() instead and remove your &drm_driver.load callback. 237 * 238 * Return: 0 on success or a negative error code on failure. 239 */ 240 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, 241 struct drm_driver *driver) 242 { 243 struct drm_device *dev; 244 int ret; 245 246 DRM_DEBUG("\n"); 247 248 dev = drm_dev_alloc(driver, &pdev->dev); 249 if (IS_ERR(dev)) 250 return PTR_ERR(dev); 251 252 #if 0 253 ret = pci_enable_device(pdev); 254 if (ret) 255 goto err_free; 256 #endif 257 258 dev->pdev = pdev; 259 #ifdef __alpha__ 260 dev->hose = pdev->sysdata; 261 #endif 262 263 if (drm_core_check_feature(dev, DRIVER_MODESET)) 264 pci_set_drvdata(pdev, dev); 265 266 #if 0 267 drm_pci_agp_init(dev); 268 #endif 269 270 ret = drm_dev_register(dev, ent->driver_data); 271 if (ret) 272 goto err_agp; 273 274 /* No locking needed since shadow-attach is single-threaded since it may 275 * only be called from the per-driver module init hook. */ 276 if (drm_core_check_feature(dev, DRIVER_LEGACY)) 277 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list); 278 279 return 0; 280 281 err_agp: 282 #if 0 283 drm_pci_agp_destroy(dev); 284 pci_disable_device(pdev); 285 err_free: 286 drm_dev_unref(dev); 287 #endif 288 return ret; 289 } 290 EXPORT_SYMBOL(drm_get_pci_dev); 291 292 /** 293 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver 294 * @driver: DRM device driver 295 * @pdriver: PCI device driver 296 * 297 * This is only used by legacy dri1 drivers and deprecated. 298 * 299 * Return: 0 on success or a negative error code on failure. 300 */ 301 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver) 302 { 303 #if 0 304 struct pci_dev *pdev = NULL; 305 const struct pci_device_id *pid; 306 int i; 307 #endif 308 309 DRM_DEBUG("\n"); 310 311 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY))) 312 return -EINVAL; 313 314 #if 0 315 /* If not using KMS, fall back to stealth mode manual scanning. */ 316 INIT_LIST_HEAD(&driver->legacy_dev_list); 317 for (i = 0; pdriver->id_table[i].vendor != 0; i++) { 318 pid = &pdriver->id_table[i]; 319 320 /* Loop around setting up a DRM device for each PCI device 321 * matching our ID and device class. If we had the internal 322 * function that pci_get_subsys and pci_get_class used, we'd 323 * be able to just pass pid in instead of doing a two-stage 324 * thing. 325 */ 326 pdev = NULL; 327 while ((pdev = 328 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 329 pid->subdevice, pdev)) != NULL) { 330 if ((pdev->class & pid->class_mask) != pid->class) 331 continue; 332 333 /* stealth mode requires a manual probe */ 334 pci_dev_get(pdev); 335 drm_get_pci_dev(pdev, pid, driver); 336 } 337 } 338 #endif 339 return 0; 340 } 341 EXPORT_SYMBOL(drm_legacy_pci_init); 342 343 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask) 344 { 345 struct pci_dev *root; 346 u32 lnkcap, lnkcap2; 347 348 *mask = 0; 349 if (!dev->pdev) 350 return -EINVAL; 351 352 root = dev->pdev->bus->self; 353 354 /* we've been informed via and serverworks don't make the cut */ 355 if (root->vendor == PCI_VENDOR_ID_VIA || 356 root->vendor == PCI_VENDOR_ID_SERVERWORKS) 357 return -EINVAL; 358 359 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap); 360 pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2); 361 362 if (lnkcap2) { /* PCIe r3.0-compliant */ 363 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB) 364 *mask |= DRM_PCIE_SPEED_25; 365 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB) 366 *mask |= DRM_PCIE_SPEED_50; 367 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB) 368 *mask |= DRM_PCIE_SPEED_80; 369 } else { /* pre-r3.0 */ 370 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB) 371 *mask |= DRM_PCIE_SPEED_25; 372 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB) 373 *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50); 374 } 375 376 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2); 377 return 0; 378 } 379 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask); 380 381 int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw) 382 { 383 struct pci_dev *root; 384 u32 lnkcap; 385 386 *mlw = 0; 387 if (!dev->pdev) 388 return -EINVAL; 389 390 root = dev->pdev->bus->self; 391 392 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap); 393 394 *mlw = (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4; 395 396 DRM_INFO("probing mlw for device %x:%x = %x\n", root->vendor, root->device, lnkcap); 397 return 0; 398 } 399 EXPORT_SYMBOL(drm_pcie_get_max_link_width); 400 401 #else 402 403 void drm_pci_agp_destroy(struct drm_device *dev) {} 404 405 int drm_irq_by_busid(struct drm_device *dev, void *data, 406 struct drm_file *file_priv) 407 { 408 return -EINVAL; 409 } 410 #endif 411 412 /** 413 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver 414 * @driver: DRM device driver 415 * @pdriver: PCI device driver 416 * 417 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This 418 * is deprecated and only used by dri1 drivers. 419 */ 420 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) 421 { 422 struct drm_device *dev, *tmp; 423 DRM_DEBUG("\n"); 424 425 if (!(driver->driver_features & DRIVER_LEGACY)) { 426 WARN_ON(1); 427 } else { 428 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list, 429 legacy_dev_list) { 430 list_del(&dev->legacy_dev_list); 431 #if 0 432 drm_put_dev(dev); 433 #endif 434 } 435 } 436 DRM_INFO("Module unloaded\n"); 437 } 438 EXPORT_SYMBOL(drm_legacy_pci_exit); 439