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 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
 148 {
 149         if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
 150             (p->busnum & 0xff) != dev->pdev->bus->number ||
 151             p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
 152                 return -EINVAL;
 153
 154         p->irq = dev->pdev->irq;
 155
 156         DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
 157                   p->irq);
 158         return 0;
 159 }
 160
 161 /**
 162  * drm_irq_by_busid - Get interrupt from bus ID
 163  * @dev: DRM device
 164  * @data: IOCTL parameter pointing to a drm_irq_busid structure
 165  * @file_priv: DRM file private.
 166  *
 167  * Finds the PCI device with the specified bus id and gets its IRQ number.
 168  * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
 169  * to that of the device that this DRM instance attached to.
 170  *
 171  * Return: 0 on success or a negative error code on failure.
 172  */
 173 int drm_irq_by_busid(struct drm_device *dev, void *data,
 174                      struct drm_file *file_priv)
 175 {
 176         struct drm_irq_busid *p = data;
 177
 178         if (drm_core_check_feature(dev, DRIVER_MODESET))
 179                 return -EINVAL;
 180
 181         /* UMS was only ever support on PCI devices. */
 182         if (WARN_ON(!dev->pdev))
 183                 return -EINVAL;
 184
 185         if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
 186                 return -EINVAL;
 187
 188         return drm_pci_irq_by_busid(dev, p);
 189 }
 190
 191 static void drm_pci_agp_init(struct drm_device *dev)
 192 {
 193         if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
 194                 if (drm_pci_device_is_agp(dev))
 195                         dev->agp = drm_agp_init(dev);
 196                 if (dev->agp) {
 197                         dev->agp->agp_mtrr = arch_phys_wc_add(
 198                                 dev->agp->agp_info.aper_base,
 199                                 dev->agp->agp_info.aper_size *
 200                                 1024 * 1024);
 201                 }
 202         }
 203 }
 204
 205 void drm_pci_agp_destroy(struct drm_device *dev)
 206 {
 207         if (dev->agp) {
 208                 arch_phys_wc_del(dev->agp->agp_mtrr);
 209                 drm_legacy_agp_clear(dev);
 210                 kfree(dev->agp);
 211                 dev->agp = NULL;
 212         }
 213 }
 214
 215 /**
 216  * drm_get_pci_dev - Register a PCI device with the DRM subsystem
 217  * @pdev: PCI device
 218  * @ent: entry from the PCI ID table that matches @pdev
 219  * @driver: DRM device driver
 220  *
 221  * Attempt to gets inter module "drm" information. If we are first
 222  * then register the character device and inter module information.
 223  * Try and register, if we fail to register, backout previous work.
 224  *
 225  * NOTE: This function is deprecated, please use drm_dev_alloc() and
 226  * drm_dev_register() instead and remove your ->load() callback.
 227  *
 228  * Return: 0 on success or a negative error code on failure.
 229  */
 230 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 231                     struct drm_driver *driver)
 232 {
 233         struct drm_device *dev;
 234         int ret;
 235
 236         DRM_DEBUG("\n");
 237
 238         dev = drm_dev_alloc(driver, &pdev->dev);
 239         if (!dev)
 240                 return -ENOMEM;
 241
 242         ret = pci_enable_device(pdev);
 243         if (ret)
 244                 goto err_free;
 245
 246         dev->pdev = pdev;
 247 #ifdef __alpha__
 248         dev->hose = pdev->sysdata;
 249 #endif
 250
 251         if (drm_core_check_feature(dev, DRIVER_MODESET))
 252                 pci_set_drvdata(pdev, dev);
 253
 254         drm_pci_agp_init(dev);
 255
 256         ret = drm_dev_register(dev, ent->driver_data);
 257         if (ret)
 258                 goto err_agp;
 259
 260         DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
 261                  driver->name, driver->major, driver->minor, driver->patchlevel,
 262                  driver->date, pci_name(pdev), dev->primary->index);
 263
 264         /* No locking needed since shadow-attach is single-threaded since it may
 265          * only be called from the per-driver module init hook. */
 266         if (!drm_core_check_feature(dev, DRIVER_MODESET))
 267                 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
 268
 269         return 0;
 270
 271 err_agp:
 272         drm_pci_agp_destroy(dev);
 273         pci_disable_device(pdev);
 274 err_free:
 275         drm_dev_unref(dev);
 276         return ret;
 277 }
 278 EXPORT_SYMBOL(drm_get_pci_dev);
 279
 280 /**
 281  * drm_pci_init - Register matching PCI devices with the DRM subsystem
 282  * @driver: DRM device driver
 283  * @pdriver: PCI device driver
 284  *
 285  * Initializes a drm_device structures, registering the stubs and initializing
 286  * the AGP device.
 287  *
 288  * NOTE: This function is deprecated. Modern modesetting drm drivers should use
 289  * pci_register_driver() directly, this function only provides shadow-binding
 290  * support for old legacy drivers on top of that core pci function.
 291  *
 292  * Return: 0 on success or a negative error code on failure.
 293  */
 294 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 295 {
 296         struct pci_dev *pdev = NULL;
 297         const struct pci_device_id *pid;
 298         int i;
 299
 300         DRM_DEBUG("\n");
 301
 302         if (driver->driver_features & DRIVER_MODESET)
 303                 return pci_register_driver(pdriver);
 304
 305         /* If not using KMS, fall back to stealth mode manual scanning. */
 306         INIT_LIST_HEAD(&driver->legacy_dev_list);
 307         for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
 308                 pid = &pdriver->id_table[i];
 309
 310                 /* Loop around setting up a DRM device for each PCI device
 311                  * matching our ID and device class.  If we had the internal
 312                  * function that pci_get_subsys and pci_get_class used, we'd
 313                  * be able to just pass pid in instead of doing a two-stage
 314                  * thing.
 315                  */
 316                 pdev = NULL;
 317                 while ((pdev =
 318                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 319                                        pid->subdevice, pdev)) != NULL) {
 320                         if ((pdev->class & pid->class_mask) != pid->class)
 321                                 continue;
 322
 323                         /* stealth mode requires a manual probe */
 324                         pci_dev_get(pdev);
 325                         drm_get_pci_dev(pdev, pid, driver);
 326                 }
 327         }
 328         return 0;
 329 }
 330
 331 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
 332 {
 333         struct pci_dev *root;
 334         u32 lnkcap, lnkcap2;
 335
 336         *mask = 0;
 337         if (!dev->pdev)
 338                 return -EINVAL;
 339
 340         root = dev->pdev->bus->self;
 341
 342         /* we've been informed via and serverworks don't make the cut */
 343         if (root->vendor == PCI_VENDOR_ID_VIA ||
 344             root->vendor == PCI_VENDOR_ID_SERVERWORKS)
 345                 return -EINVAL;
 346
 347         pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
 348         pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2);
 349
 350         if (lnkcap2) {  /* PCIe r3.0-compliant */
 351                 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
 352                         *mask |= DRM_PCIE_SPEED_25;
 353                 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
 354                         *mask |= DRM_PCIE_SPEED_50;
 355                 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
 356                         *mask |= DRM_PCIE_SPEED_80;
 357         } else {        /* pre-r3.0 */
 358                 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
 359                         *mask |= DRM_PCIE_SPEED_25;
 360                 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
 361                         *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50);
 362         }
 363
 364         DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2);
 365         return 0;
 366 }
 367 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
 368
 369 int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw)
 370 {
 371         struct pci_dev *root;
 372         u32 lnkcap;
 373
 374         *mlw = 0;
 375         if (!dev->pdev)
 376                 return -EINVAL;
 377
 378         root = dev->pdev->bus->self;
 379
 380         pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
 381
 382         *mlw = (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4;
 383
 384         DRM_INFO("probing mlw for device %x:%x = %x\n", root->vendor, root->device, lnkcap);
 385         return 0;
 386 }
 387 EXPORT_SYMBOL(drm_pcie_get_max_link_width);
 388
 389 #else
 390
 391 int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 392 {
 393         return -1;
 394 }
 395
 396 void drm_pci_agp_destroy(struct drm_device *dev) {}
 397
 398 int drm_irq_by_busid(struct drm_device *dev, void *data,
 399                      struct drm_file *file_priv)
 400 {
 401         return -EINVAL;
 402 }
 403 #endif
 404
 405 EXPORT_SYMBOL(drm_pci_init);
 406
 407 /**
 408  * drm_pci_exit - Unregister matching PCI devices from the DRM subsystem
 409  * @driver: DRM device driver
 410  * @pdriver: PCI device driver
 411  *
 412  * Unregisters one or more devices matched by a PCI driver from the DRM
 413  * subsystem.
 414  *
 415  * NOTE: This function is deprecated. Modern modesetting drm drivers should use
 416  * pci_unregister_driver() directly, this function only provides shadow-binding
 417  * support for old legacy drivers on top of that core pci function.
 418  */
 419 void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
 420 {
 421         struct drm_device *dev, *tmp;
 422         DRM_DEBUG("\n");
 423
 424         if (driver->driver_features & DRIVER_MODESET) {
 425                 pci_unregister_driver(pdriver);
 426         } else {
 427                 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
 428                                          legacy_dev_list) {
 429                         list_del(&dev->legacy_dev_list);
 430                         drm_put_dev(dev);
 431                 }
 432         }
 433         DRM_INFO("Module unloaded\n");
 434 }
 435 EXPORT_SYMBOL(drm_pci_exit);