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/drm_pci.h>
  30 #include <drm/drmP.h>
  31 #include "drm_internal.h"
  32 #include "drm_legacy.h"
  33
  34 /**
  35  * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.
  36  * @dev: DRM device
  37  * @size: size of block to allocate
  38  * @align: alignment of block
  39  *
  40  * FIXME: This is a needless abstraction of the Linux dma-api and should be
  41  * removed.
  42  *
  43  * Return: A handle to the allocated memory block on success or NULL on
  44  * failure.
  45  */
  46 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
  47 {
  48         drm_dma_handle_t *dmah;
  49         unsigned long addr;
  50         size_t sz;
  51
  52         /* pci_alloc_consistent only guarantees alignment to the smallest
  53          * PAGE_SIZE order which is greater than or equal to the requested size.
  54          * Return NULL here for now to make sure nobody tries for larger alignment
  55          */
  56         if (align > size)
  57                 return NULL;
  58
  59         dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
  60         if (!dmah)
  61                 return NULL;
  62
  63         dmah->size = size;
  64         dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size,
  65                                          &dmah->busaddr,
  66                                          GFP_KERNEL | __GFP_COMP);
  67
  68         if (dmah->vaddr == NULL) {
  69                 kfree(dmah);
  70                 return NULL;
  71         }
  72
  73         /* XXX - Is virt_to_page() legal for consistent mem? */
  74         /* Reserve */
  75         for (addr = (unsigned long)dmah->vaddr, sz = size;
  76              sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
  77                 SetPageReserved(virt_to_page((void *)addr));
  78         }
  79
  80         return dmah;
  81 }
  82
  83 EXPORT_SYMBOL(drm_pci_alloc);
  84
  85 /*
  86  * Free a PCI consistent memory block without freeing its descriptor.
  87  *
  88  * This function is for internal use in the Linux-specific DRM core code.
  89  */
  90 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
  91 {
  92         unsigned long addr;
  93         size_t sz;
  94
  95         if (dmah->vaddr) {
  96                 /* XXX - Is virt_to_page() legal for consistent mem? */
  97                 /* Unreserve */
  98                 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
  99                      sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
 100                         ClearPageReserved(virt_to_page((void *)addr));
 101                 }
 102                 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
 103                                   dmah->busaddr);
 104         }
 105 }
 106
 107 /**
 108  * drm_pci_free - Free a PCI consistent memory block
 109  * @dev: DRM device
 110  * @dmah: handle to memory block
 111  *
 112  * FIXME: This is a needless abstraction of the Linux dma-api and should be
 113  * removed.
 114  */
 115 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
 116 {
 117         __drm_legacy_pci_free(dev, dmah);
 118         kfree(dmah);
 119 }
 120
 121 EXPORT_SYMBOL(drm_pci_free);
 122
 123 #ifdef CONFIG_PCI
 124
 125 static int drm_get_pci_domain(struct drm_device *dev)
 126 {
 127 #ifndef __alpha__
 128         /* For historical reasons, drm_get_pci_domain() is busticated
 129          * on most archs and has to remain so for userspace interface
 130          * < 1.4, except on alpha which was right from the beginning
 131          */
 132         if (dev->if_version < 0x10004)
 133                 return 0;
 134 #endif /* __alpha__ */
 135
 136         return pci_domain_nr(dev->pdev->bus);
 137 }
 138
 139 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
 140 {
 141         master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
 142                                         drm_get_pci_domain(dev),
 143                                         dev->pdev->bus->number,
 144                                         PCI_SLOT(dev->pdev->devfn),
 145                                         PCI_FUNC(dev->pdev->devfn));
 146         if (!master->unique)
 147                 return -ENOMEM;
 148
 149         master->unique_len = strlen(master->unique);
 150         return 0;
 151 }
 152
 153 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
 154 {
 155         if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
 156             (p->busnum & 0xff) != dev->pdev->bus->number ||
 157             p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
 158                 return -EINVAL;
 159
 160         p->irq = dev->pdev->irq;
 161
 162         DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
 163                   p->irq);
 164         return 0;
 165 }
 166
 167 /**
 168  * drm_irq_by_busid - Get interrupt from bus ID
 169  * @dev: DRM device
 170  * @data: IOCTL parameter pointing to a drm_irq_busid structure
 171  * @file_priv: DRM file private.
 172  *
 173  * Finds the PCI device with the specified bus id and gets its IRQ number.
 174  * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
 175  * to that of the device that this DRM instance attached to.
 176  *
 177  * Return: 0 on success or a negative error code on failure.
 178  */
 179 int drm_irq_by_busid(struct drm_device *dev, void *data,
 180                      struct drm_file *file_priv)
 181 {
 182         struct drm_irq_busid *p = data;
 183
 184         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 185                 return -EOPNOTSUPP;
 186
 187         /* UMS was only ever support on PCI devices. */
 188         if (WARN_ON(!dev->pdev))
 189                 return -EINVAL;
 190
 191         if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
 192                 return -EOPNOTSUPP;
 193
 194         return drm_pci_irq_by_busid(dev, p);
 195 }
 196
 197 static void drm_pci_agp_init(struct drm_device *dev)
 198 {
 199         if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
 200                 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP))
 201                         dev->agp = drm_agp_init(dev);
 202                 if (dev->agp) {
 203                         dev->agp->agp_mtrr = arch_phys_wc_add(
 204                                 dev->agp->agp_info.aper_base,
 205                                 dev->agp->agp_info.aper_size *
 206                                 1024 * 1024);
 207                 }
 208         }
 209 }
 210
 211 void drm_pci_agp_destroy(struct drm_device *dev)
 212 {
 213         if (dev->agp) {
 214                 arch_phys_wc_del(dev->agp->agp_mtrr);
 215                 drm_legacy_agp_clear(dev);
 216                 kfree(dev->agp);
 217                 dev->agp = NULL;
 218         }
 219 }
 220
 221 /**
 222  * drm_get_pci_dev - Register a PCI device with the DRM subsystem
 223  * @pdev: PCI device
 224  * @ent: entry from the PCI ID table that matches @pdev
 225  * @driver: DRM device driver
 226  *
 227  * Attempt to gets inter module "drm" information. If we are first
 228  * then register the character device and inter module information.
 229  * Try and register, if we fail to register, backout previous work.
 230  *
 231  * NOTE: This function is deprecated, please use drm_dev_alloc() and
 232  * drm_dev_register() instead and remove your &drm_driver.load callback.
 233  *
 234  * Return: 0 on success or a negative error code on failure.
 235  */
 236 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 237                     struct drm_driver *driver)
 238 {
 239         struct drm_device *dev;
 240         int ret;
 241
 242         DRM_DEBUG("\n");
 243
 244         dev = drm_dev_alloc(driver, &pdev->dev);
 245         if (IS_ERR(dev))
 246                 return PTR_ERR(dev);
 247
 248         ret = pci_enable_device(pdev);
 249         if (ret)
 250                 goto err_free;
 251
 252         dev->pdev = pdev;
 253 #ifdef __alpha__
 254         dev->hose = pdev->sysdata;
 255 #endif
 256
 257         if (drm_core_check_feature(dev, DRIVER_MODESET))
 258                 pci_set_drvdata(pdev, dev);
 259
 260         drm_pci_agp_init(dev);
 261
 262         ret = drm_dev_register(dev, ent->driver_data);
 263         if (ret)
 264                 goto err_agp;
 265
 266         /* No locking needed since shadow-attach is single-threaded since it may
 267          * only be called from the per-driver module init hook. */
 268         if (drm_core_check_feature(dev, DRIVER_LEGACY))
 269                 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
 270
 271         return 0;
 272
 273 err_agp:
 274         drm_pci_agp_destroy(dev);
 275         pci_disable_device(pdev);
 276 err_free:
 277         drm_dev_put(dev);
 278         return ret;
 279 }
 280 EXPORT_SYMBOL(drm_get_pci_dev);
 281
 282 /**
 283  * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver
 284  * @driver: DRM device driver
 285  * @pdriver: PCI device driver
 286  *
 287  * This is only used by legacy dri1 drivers and deprecated.
 288  *
 289  * Return: 0 on success or a negative error code on failure.
 290  */
 291 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 292 {
 293         struct pci_dev *pdev = NULL;
 294         const struct pci_device_id *pid;
 295         int i;
 296
 297         DRM_DEBUG("\n");
 298
 299         if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY)))
 300                 return -EINVAL;
 301
 302         /* If not using KMS, fall back to stealth mode manual scanning. */
 303         INIT_LIST_HEAD(&driver->legacy_dev_list);
 304         for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
 305                 pid = &pdriver->id_table[i];
 306
 307                 /* Loop around setting up a DRM device for each PCI device
 308                  * matching our ID and device class.  If we had the internal
 309                  * function that pci_get_subsys and pci_get_class used, we'd
 310                  * be able to just pass pid in instead of doing a two-stage
 311                  * thing.
 312                  */
 313                 pdev = NULL;
 314                 while ((pdev =
 315                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 316                                        pid->subdevice, pdev)) != NULL) {
 317                         if ((pdev->class & pid->class_mask) != pid->class)
 318                                 continue;
 319
 320                         /* stealth mode requires a manual probe */
 321                         pci_dev_get(pdev);
 322                         drm_get_pci_dev(pdev, pid, driver);
 323                 }
 324         }
 325         return 0;
 326 }
 327 EXPORT_SYMBOL(drm_legacy_pci_init);
 328
 329 #else
 330
 331 void drm_pci_agp_destroy(struct drm_device *dev) {}
 332
 333 int drm_irq_by_busid(struct drm_device *dev, void *data,
 334                      struct drm_file *file_priv)
 335 {
 336         return -EINVAL;
 337 }
 338 #endif
 339
 340 /**
 341  * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver
 342  * @driver: DRM device driver
 343  * @pdriver: PCI device driver
 344  *
 345  * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This
 346  * is deprecated and only used by dri1 drivers.
 347  */
 348 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
 349 {
 350         struct drm_device *dev, *tmp;
 351         DRM_DEBUG("\n");
 352
 353         if (!(driver->driver_features & DRIVER_LEGACY)) {
 354                 WARN_ON(1);
 355         } else {
 356                 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
 357                                          legacy_dev_list) {
 358                         list_del(&dev->legacy_dev_list);
 359                         drm_put_dev(dev);
 360                 }
 361         }
 362         DRM_INFO("Module unloaded\n");
 363 }
 364 EXPORT_SYMBOL(drm_legacy_pci_exit);