drivers/gpu/drm/drm_pci.c

   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 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         return 0;
 142 }
 143 EXPORT_SYMBOL(drm_pci_set_busid);
 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 = kmalloc(master->unique_len + 1, GFP_KERNEL);
 153         if (!master->unique) {
 154                 ret = -ENOMEM;
 155                 goto err;
 156         }
 157
 158         if (copy_from_user(master->unique, u->unique, master->unique_len)) {
 159                 ret = -EFAULT;
 160                 goto err;
 161         }
 162
 163         master->unique[master->unique_len] = '\0';
 164
 165         /* Return error if the busid submitted doesn't match the device's actual
 166          * busid.
 167          */
 168         ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
 169         if (ret != 3) {
 170                 ret = -EINVAL;
 171                 goto err;
 172         }
 173
 174         domain = bus >> 8;
 175         bus &= 0xff;
 176
 177         if ((domain != drm_get_pci_domain(dev)) ||
 178             (bus != dev->pdev->bus->number) ||
 179             (slot != PCI_SLOT(dev->pdev->devfn)) ||
 180             (func != PCI_FUNC(dev->pdev->devfn))) {
 181                 ret = -EINVAL;
 182                 goto err;
 183         }
 184         return 0;
 185 err:
 186         return ret;
 187 }
 188
 189 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
 190 {
 191         if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
 192             (p->busnum & 0xff) != dev->pdev->bus->number ||
 193             p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
 194                 return -EINVAL;
 195
 196         p->irq = dev->pdev->irq;
 197
 198         DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
 199                   p->irq);
 200         return 0;
 201 }
 202
 203 /**
 204  * drm_irq_by_busid - Get interrupt from bus ID
 205  * @dev: DRM device
 206  * @data: IOCTL parameter pointing to a drm_irq_busid structure
 207  * @file_priv: DRM file private.
 208  *
 209  * Finds the PCI device with the specified bus id and gets its IRQ number.
 210  * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
 211  * to that of the device that this DRM instance attached to.
 212  *
 213  * Return: 0 on success or a negative error code on failure.
 214  */
 215 int drm_irq_by_busid(struct drm_device *dev, void *data,
 216                      struct drm_file *file_priv)
 217 {
 218         struct drm_irq_busid *p = data;
 219
 220         if (drm_core_check_feature(dev, DRIVER_MODESET))
 221                 return -EINVAL;
 222
 223         /* UMS was only ever support on PCI devices. */
 224         if (WARN_ON(!dev->pdev))
 225                 return -EINVAL;
 226
 227         if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
 228                 return -EINVAL;
 229
 230         return drm_pci_irq_by_busid(dev, p);
 231 }
 232
 233 static void drm_pci_agp_init(struct drm_device *dev)
 234 {
 235         if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
 236                 if (drm_pci_device_is_agp(dev))
 237                         dev->agp = drm_agp_init(dev);
 238                 if (dev->agp) {
 239                         dev->agp->agp_mtrr = arch_phys_wc_add(
 240                                 dev->agp->agp_info.aper_base,
 241                                 dev->agp->agp_info.aper_size *
 242                                 1024 * 1024);
 243                 }
 244         }
 245 }
 246
 247 void drm_pci_agp_destroy(struct drm_device *dev)
 248 {
 249         if (dev->agp) {
 250                 arch_phys_wc_del(dev->agp->agp_mtrr);
 251                 drm_agp_clear(dev);
 252                 kfree(dev->agp);
 253                 dev->agp = NULL;
 254         }
 255 }
 256
 257 static struct drm_bus drm_pci_bus = {
 258         .set_busid = drm_pci_set_busid,
 259 };
 260
 261 /**
 262  * drm_get_pci_dev - Register a PCI device with the DRM subsystem
 263  * @pdev: PCI device
 264  * @ent: entry from the PCI ID table that matches @pdev
 265  * @driver: DRM device driver
 266  *
 267  * Attempt to gets inter module "drm" information. If we are first
 268  * then register the character device and inter module information.
 269  * Try and register, if we fail to register, backout previous work.
 270  *
 271  * Return: 0 on success or a negative error code on failure.
 272  */
 273 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 274                     struct drm_driver *driver)
 275 {
 276         struct drm_device *dev;
 277         int ret;
 278
 279         DRM_DEBUG("\n");
 280
 281         dev = drm_dev_alloc(driver, &pdev->dev);
 282         if (!dev)
 283                 return -ENOMEM;
 284
 285         ret = pci_enable_device(pdev);
 286         if (ret)
 287                 goto err_free;
 288
 289         dev->pdev = pdev;
 290 #ifdef __alpha__
 291         dev->hose = pdev->sysdata;
 292 #endif
 293
 294         if (drm_core_check_feature(dev, DRIVER_MODESET))
 295                 pci_set_drvdata(pdev, dev);
 296
 297         drm_pci_agp_init(dev);
 298
 299         ret = drm_dev_register(dev, ent->driver_data);
 300         if (ret)
 301                 goto err_agp;
 302
 303         DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
 304                  driver->name, driver->major, driver->minor, driver->patchlevel,
 305                  driver->date, pci_name(pdev), dev->primary->index);
 306
 307         /* No locking needed since shadow-attach is single-threaded since it may
 308          * only be called from the per-driver module init hook. */
 309         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 310                 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
 311
 312         return 0;
 313
 314 err_agp:
 315         drm_pci_agp_destroy(dev);
 316         pci_disable_device(pdev);
 317 err_free:
 318         drm_dev_unref(dev);
 319         return ret;
 320 }
 321 EXPORT_SYMBOL(drm_get_pci_dev);
 322
 323 /**
 324  * drm_pci_init - Register matching PCI devices with the DRM subsystem
 325  * @driver: DRM device driver
 326  * @pdriver: PCI device driver
 327  *
 328  * Initializes a drm_device structures, registering the stubs and initializing
 329  * the AGP device.
 330  *
 331  * Return: 0 on success or a negative error code on failure.
 332  */
 333 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 334 {
 335         struct pci_dev *pdev = NULL;
 336         const struct pci_device_id *pid;
 337         int i;
 338
 339         DRM_DEBUG("\n");
 340
 341         driver->bus = &drm_pci_bus;
 342
 343         if (driver->driver_features & DRIVER_MODESET)
 344                 return pci_register_driver(pdriver);
 345
 346         /* If not using KMS, fall back to stealth mode manual scanning. */
 347         INIT_LIST_HEAD(&driver->legacy_dev_list);
 348         for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
 349                 pid = &pdriver->id_table[i];
 350
 351                 /* Loop around setting up a DRM device for each PCI device
 352                  * matching our ID and device class.  If we had the internal
 353                  * function that pci_get_subsys and pci_get_class used, we'd
 354                  * be able to just pass pid in instead of doing a two-stage
 355                  * thing.
 356                  */
 357                 pdev = NULL;
 358                 while ((pdev =
 359                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 360                                        pid->subdevice, pdev)) != NULL) {
 361                         if ((pdev->class & pid->class_mask) != pid->class)
 362                                 continue;
 363
 364                         /* stealth mode requires a manual probe */
 365                         pci_dev_get(pdev);
 366                         drm_get_pci_dev(pdev, pid, driver);
 367                 }
 368         }
 369         return 0;
 370 }
 371
 372 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
 373 {
 374         struct pci_dev *root;
 375         u32 lnkcap, lnkcap2;
 376
 377         *mask = 0;
 378         if (!dev->pdev)
 379                 return -EINVAL;
 380
 381         root = dev->pdev->bus->self;
 382
 383         /* we've been informed via and serverworks don't make the cut */
 384         if (root->vendor == PCI_VENDOR_ID_VIA ||
 385             root->vendor == PCI_VENDOR_ID_SERVERWORKS)
 386                 return -EINVAL;
 387
 388         pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
 389         pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2);
 390
 391         if (lnkcap2) {  /* PCIe r3.0-compliant */
 392                 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
 393                         *mask |= DRM_PCIE_SPEED_25;
 394                 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
 395                         *mask |= DRM_PCIE_SPEED_50;
 396                 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
 397                         *mask |= DRM_PCIE_SPEED_80;
 398         } else {        /* pre-r3.0 */
 399                 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
 400                         *mask |= DRM_PCIE_SPEED_25;
 401                 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
 402                         *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50);
 403         }
 404
 405         DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2);
 406         return 0;
 407 }
 408 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
 409
 410 #else
 411
 412 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 413 {
 414         return -1;
 415 }
 416
 417 void drm_pci_agp_destroy(struct drm_device *dev) {}
 418
 419 int drm_irq_by_busid(struct drm_device *dev, void *data,
 420                      struct drm_file *file_priv)
 421 {
 422         return -EINVAL;
 423 }
 424
 425 int drm_pci_set_unique(struct drm_device *dev,
 426                        struct drm_master *master,
 427                        struct drm_unique *u)
 428 {
 429         return -EINVAL;
 430 }
 431 #endif
 432
 433 EXPORT_SYMBOL(drm_pci_init);
 434
 435 /**
 436  * drm_pci_exit - Unregister matching PCI devices from the DRM subsystem
 437  * @driver: DRM device driver
 438  * @pdriver: PCI device driver
 439  *
 440  * Unregisters one or more devices matched by a PCI driver from the DRM
 441  * subsystem.
 442  */
 443 void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
 444 {
 445         struct drm_device *dev, *tmp;
 446         DRM_DEBUG("\n");
 447
 448         if (driver->driver_features & DRIVER_MODESET) {
 449                 pci_unregister_driver(pdriver);
 450         } else {
 451                 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
 452                                          legacy_dev_list) {
 453                         list_del(&dev->legacy_dev_list);
 454                         drm_put_dev(dev);
 455                 }
 456         }
 457         DRM_INFO("Module unloaded\n");
 458 }
 459 EXPORT_SYMBOL(drm_pci_exit);