drivers/gpu/drm/drm_pci.c

   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_set_busid(struct drm_device *dev, struct drm_master *master)
 141 {
 142         int len, ret;
 143         master->unique_len = 40;
 144         master->unique_size = master->unique_len;
 145         master->unique = kmalloc(master->unique_size, GFP_KERNEL);
 146         if (master->unique == NULL)
 147                 return -ENOMEM;
 148
 149
 150         len = snprintf(master->unique, master->unique_len,
 151                        "pci:%04x:%02x:%02x.%d",
 152                        drm_get_pci_domain(dev),
 153                        dev->pdev->bus->number,
 154                        PCI_SLOT(dev->pdev->devfn),
 155                        PCI_FUNC(dev->pdev->devfn));
 156
 157         if (len >= master->unique_len) {
 158                 DRM_ERROR("buffer overflow");
 159                 ret = -EINVAL;
 160                 goto err;
 161         } else
 162                 master->unique_len = len;
 163
 164         return 0;
 165 err:
 166         return ret;
 167 }
 168
 169 int drm_pci_set_unique(struct drm_device *dev,
 170                        struct drm_master *master,
 171                        struct drm_unique *u)
 172 {
 173         int domain, bus, slot, func, ret;
 174
 175         master->unique_len = u->unique_len;
 176         master->unique_size = u->unique_len + 1;
 177         master->unique = kmalloc(master->unique_size, GFP_KERNEL);
 178         if (!master->unique) {
 179                 ret = -ENOMEM;
 180                 goto err;
 181         }
 182
 183         if (copy_from_user(master->unique, u->unique, master->unique_len)) {
 184                 ret = -EFAULT;
 185                 goto err;
 186         }
 187
 188         master->unique[master->unique_len] = '\0';
 189
 190         /* Return error if the busid submitted doesn't match the device's actual
 191          * busid.
 192          */
 193         ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
 194         if (ret != 3) {
 195                 ret = -EINVAL;
 196                 goto err;
 197         }
 198
 199         domain = bus >> 8;
 200         bus &= 0xff;
 201
 202         if ((domain != drm_get_pci_domain(dev)) ||
 203             (bus != dev->pdev->bus->number) ||
 204             (slot != PCI_SLOT(dev->pdev->devfn)) ||
 205             (func != PCI_FUNC(dev->pdev->devfn))) {
 206                 ret = -EINVAL;
 207                 goto err;
 208         }
 209         return 0;
 210 err:
 211         return ret;
 212 }
 213
 214 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
 215 {
 216         if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
 217             (p->busnum & 0xff) != dev->pdev->bus->number ||
 218             p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
 219                 return -EINVAL;
 220
 221         p->irq = dev->pdev->irq;
 222
 223         DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
 224                   p->irq);
 225         return 0;
 226 }
 227
 228 /**
 229  * Get interrupt from bus id.
 230  *
 231  * \param inode device inode.
 232  * \param file_priv DRM file private.
 233  * \param cmd command.
 234  * \param arg user argument, pointing to a drm_irq_busid structure.
 235  * \return zero on success or a negative number on failure.
 236  *
 237  * Finds the PCI device with the specified bus id and gets its IRQ number.
 238  * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
 239  * to that of the device that this DRM instance attached to.
 240  */
 241 int drm_irq_by_busid(struct drm_device *dev, void *data,
 242                      struct drm_file *file_priv)
 243 {
 244         struct drm_irq_busid *p = data;
 245
 246         if (drm_core_check_feature(dev, DRIVER_MODESET))
 247                 return -EINVAL;
 248
 249         /* UMS was only ever support on PCI devices. */
 250         if (WARN_ON(!dev->pdev))
 251                 return -EINVAL;
 252
 253         if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
 254                 return -EINVAL;
 255
 256         return drm_pci_irq_by_busid(dev, p);
 257 }
 258
 259 static void drm_pci_agp_init(struct drm_device *dev)
 260 {
 261         if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
 262                 if (drm_pci_device_is_agp(dev))
 263                         dev->agp = drm_agp_init(dev);
 264                 if (dev->agp) {
 265                         dev->agp->agp_mtrr = arch_phys_wc_add(
 266                                 dev->agp->agp_info.aper_base,
 267                                 dev->agp->agp_info.aper_size *
 268                                 1024 * 1024);
 269                 }
 270         }
 271 }
 272
 273 void drm_pci_agp_destroy(struct drm_device *dev)
 274 {
 275         if (dev->agp) {
 276                 arch_phys_wc_del(dev->agp->agp_mtrr);
 277                 drm_agp_clear(dev);
 278                 kfree(dev->agp);
 279                 dev->agp = NULL;
 280         }
 281 }
 282
 283 static struct drm_bus drm_pci_bus = {
 284         .set_busid = drm_pci_set_busid,
 285 };
 286
 287 /**
 288  * Register.
 289  *
 290  * \param pdev - PCI device structure
 291  * \param ent entry from the PCI ID table with device type flags
 292  * \return zero on success or a negative number on failure.
 293  *
 294  * Attempt to gets inter module "drm" information. If we are first
 295  * then register the character device and inter module information.
 296  * Try and register, if we fail to register, backout previous work.
 297  */
 298 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 299                     struct drm_driver *driver)
 300 {
 301         struct drm_device *dev;
 302         int ret;
 303
 304         DRM_DEBUG("\n");
 305
 306         dev = drm_dev_alloc(driver, &pdev->dev);
 307         if (!dev)
 308                 return -ENOMEM;
 309
 310         ret = pci_enable_device(pdev);
 311         if (ret)
 312                 goto err_free;
 313
 314         dev->pdev = pdev;
 315 #ifdef __alpha__
 316         dev->hose = pdev->sysdata;
 317 #endif
 318
 319         if (drm_core_check_feature(dev, DRIVER_MODESET))
 320                 pci_set_drvdata(pdev, dev);
 321
 322         drm_pci_agp_init(dev);
 323
 324         ret = drm_dev_register(dev, ent->driver_data);
 325         if (ret)
 326                 goto err_agp;
 327
 328         DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
 329                  driver->name, driver->major, driver->minor, driver->patchlevel,
 330                  driver->date, pci_name(pdev), dev->primary->index);
 331
 332         /* No locking needed since shadow-attach is single-threaded since it may
 333          * only be called from the per-driver module init hook. */
 334         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 335                 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
 336
 337         return 0;
 338
 339 err_agp:
 340         drm_pci_agp_destroy(dev);
 341         pci_disable_device(pdev);
 342 err_free:
 343         drm_dev_unref(dev);
 344         return ret;
 345 }
 346 EXPORT_SYMBOL(drm_get_pci_dev);
 347
 348 /**
 349  * PCI device initialization. Called direct from modules at load time.
 350  *
 351  * \return zero on success or a negative number on failure.
 352  *
 353  * Initializes a drm_device structures,registering the
 354  * stubs and initializing the AGP device.
 355  *
 356  * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 357  * after the initialization for driver customization.
 358  */
 359 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 360 {
 361         struct pci_dev *pdev = NULL;
 362         const struct pci_device_id *pid;
 363         int i;
 364
 365         DRM_DEBUG("\n");
 366
 367         driver->bus = &drm_pci_bus;
 368
 369         if (driver->driver_features & DRIVER_MODESET)
 370                 return pci_register_driver(pdriver);
 371
 372         /* If not using KMS, fall back to stealth mode manual scanning. */
 373         INIT_LIST_HEAD(&driver->legacy_dev_list);
 374         for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
 375                 pid = &pdriver->id_table[i];
 376
 377                 /* Loop around setting up a DRM device for each PCI device
 378                  * matching our ID and device class.  If we had the internal
 379                  * function that pci_get_subsys and pci_get_class used, we'd
 380                  * be able to just pass pid in instead of doing a two-stage
 381                  * thing.
 382                  */
 383                 pdev = NULL;
 384                 while ((pdev =
 385                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 386                                        pid->subdevice, pdev)) != NULL) {
 387                         if ((pdev->class & pid->class_mask) != pid->class)
 388                                 continue;
 389
 390                         /* stealth mode requires a manual probe */
 391                         pci_dev_get(pdev);
 392                         drm_get_pci_dev(pdev, pid, driver);
 393                 }
 394         }
 395         return 0;
 396 }
 397
 398 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
 399 {
 400         struct pci_dev *root;
 401         u32 lnkcap, lnkcap2;
 402
 403         *mask = 0;
 404         if (!dev->pdev)
 405                 return -EINVAL;
 406
 407         root = dev->pdev->bus->self;
 408
 409         /* we've been informed via and serverworks don't make the cut */
 410         if (root->vendor == PCI_VENDOR_ID_VIA ||
 411             root->vendor == PCI_VENDOR_ID_SERVERWORKS)
 412                 return -EINVAL;
 413
 414         pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
 415         pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2);
 416
 417         if (lnkcap2) {  /* PCIe r3.0-compliant */
 418                 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
 419                         *mask |= DRM_PCIE_SPEED_25;
 420                 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
 421                         *mask |= DRM_PCIE_SPEED_50;
 422                 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
 423                         *mask |= DRM_PCIE_SPEED_80;
 424         } else {        /* pre-r3.0 */
 425                 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
 426                         *mask |= DRM_PCIE_SPEED_25;
 427                 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
 428                         *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50);
 429         }
 430
 431         DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2);
 432         return 0;
 433 }
 434 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
 435
 436 #else
 437
 438 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 439 {
 440         return -1;
 441 }
 442
 443 void drm_pci_agp_destroy(struct drm_device *dev) {}
 444
 445 int drm_irq_by_busid(struct drm_device *dev, void *data,
 446                      struct drm_file *file_priv)
 447 {
 448         return -EINVAL;
 449 }
 450
 451 int drm_pci_set_unique(struct drm_device *dev,
 452                        struct drm_master *master,
 453                        struct drm_unique *u)
 454 {
 455         return -EINVAL;
 456 }
 457 #endif
 458
 459 EXPORT_SYMBOL(drm_pci_init);
 460
 461 /*@}*/
 462 void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
 463 {
 464         struct drm_device *dev, *tmp;
 465         DRM_DEBUG("\n");
 466
 467         if (driver->driver_features & DRIVER_MODESET) {
 468                 pci_unregister_driver(pdriver);
 469         } else {
 470                 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
 471                                          legacy_dev_list) {
 472                         list_del(&dev->legacy_dev_list);
 473                         drm_put_dev(dev);
 474                 }
 475         }
 476         DRM_INFO("Module unloaded\n");
 477 }
 478 EXPORT_SYMBOL(drm_pci_exit);