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