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