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/dma-mapping.h>
  26 #include <linux/export.h>
  27 #include <linux/pci.h>
  28 #include <linux/slab.h>
  29
  30 #include <drm/drm.h>
  31 #include <drm/drm_agpsupport.h>
  32 #include <drm/drm_drv.h>
  33 #include <drm/drm_print.h>
  34
  35 #include "drm_internal.h"
  36 #include "drm_legacy.h"
  37
  38 #ifdef CONFIG_DRM_LEGACY
  39
  40 /**
  41  * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.
  42  * @dev: DRM device
  43  * @size: size of block to allocate
  44  * @align: alignment of block
  45  *
  46  * FIXME: This is a needless abstraction of the Linux dma-api and should be
  47  * removed.
  48  *
  49  * Return: A handle to the allocated memory block on success or NULL on
  50  * failure.
  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
  56         /* pci_alloc_consistent only guarantees alignment to the smallest
  57          * PAGE_SIZE order which is greater than or equal to the requested size.
  58          * Return NULL here for now to make sure nobody tries for larger alignment
  59          */
  60         if (align > size)
  61                 return NULL;
  62
  63         dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
  64         if (!dmah)
  65                 return NULL;
  66
  67         dmah->size = size;
  68         dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size,
  69                                          &dmah->busaddr,
  70                                          GFP_KERNEL);
  71
  72         if (dmah->vaddr == NULL) {
  73                 kfree(dmah);
  74                 return NULL;
  75         }
  76
  77         return dmah;
  78 }
  79 EXPORT_SYMBOL(drm_pci_alloc);
  80
  81 /**
  82  * drm_pci_free - Free a PCI consistent memory block
  83  * @dev: DRM device
  84  * @dmah: handle to memory block
  85  *
  86  * FIXME: This is a needless abstraction of the Linux dma-api and should be
  87  * removed.
  88  */
  89 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
  90 {
  91         dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
  92                           dmah->busaddr);
  93         kfree(dmah);
  94 }
  95
  96 EXPORT_SYMBOL(drm_pci_free);
  97 #endif
  98
  99 static int drm_get_pci_domain(struct drm_device *dev)
 100 {
 101 #ifndef __alpha__
 102         /* For historical reasons, drm_get_pci_domain() is busticated
 103          * on most archs and has to remain so for userspace interface
 104          * < 1.4, except on alpha which was right from the beginning
 105          */
 106         if (dev->if_version < 0x10004)
 107                 return 0;
 108 #endif /* __alpha__ */
 109
 110         return pci_domain_nr(dev->pdev->bus);
 111 }
 112
 113 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
 114 {
 115         master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
 116                                         drm_get_pci_domain(dev),
 117                                         dev->pdev->bus->number,
 118                                         PCI_SLOT(dev->pdev->devfn),
 119                                         PCI_FUNC(dev->pdev->devfn));
 120         if (!master->unique)
 121                 return -ENOMEM;
 122
 123         master->unique_len = strlen(master->unique);
 124         return 0;
 125 }
 126
 127 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
 128 {
 129         if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
 130             (p->busnum & 0xff) != dev->pdev->bus->number ||
 131             p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
 132                 return -EINVAL;
 133
 134         p->irq = dev->pdev->irq;
 135
 136         DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
 137                   p->irq);
 138         return 0;
 139 }
 140
 141 /**
 142  * drm_legacy_irq_by_busid - Get interrupt from bus ID
 143  * @dev: DRM device
 144  * @data: IOCTL parameter pointing to a drm_irq_busid structure
 145  * @file_priv: DRM file private.
 146  *
 147  * Finds the PCI device with the specified bus id and gets its IRQ number.
 148  * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
 149  * to that of the device that this DRM instance attached to.
 150  *
 151  * Return: 0 on success or a negative error code on failure.
 152  */
 153 int drm_legacy_irq_by_busid(struct drm_device *dev, void *data,
 154                             struct drm_file *file_priv)
 155 {
 156         struct drm_irq_busid *p = data;
 157
 158         if (!drm_core_check_feature(dev, DRIVER_LEGACY))
 159                 return -EOPNOTSUPP;
 160
 161         /* UMS was only ever support on PCI devices. */
 162         if (WARN_ON(!dev->pdev))
 163                 return -EINVAL;
 164
 165         if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
 166                 return -EOPNOTSUPP;
 167
 168         return drm_pci_irq_by_busid(dev, p);
 169 }
 170
 171 void drm_pci_agp_destroy(struct drm_device *dev)
 172 {
 173         if (dev->agp) {
 174                 arch_phys_wc_del(dev->agp->agp_mtrr);
 175                 drm_legacy_agp_clear(dev);
 176                 kfree(dev->agp);
 177                 dev->agp = NULL;
 178         }
 179 }
 180
 181 #ifdef CONFIG_DRM_LEGACY
 182
 183 static void drm_pci_agp_init(struct drm_device *dev)
 184 {
 185         if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
 186                 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP))
 187                         dev->agp = drm_agp_init(dev);
 188                 if (dev->agp) {
 189                         dev->agp->agp_mtrr = arch_phys_wc_add(
 190                                 dev->agp->agp_info.aper_base,
 191                                 dev->agp->agp_info.aper_size *
 192                                 1024 * 1024);
 193                 }
 194         }
 195 }
 196
 197 static int drm_get_pci_dev(struct pci_dev *pdev,
 198                            const struct pci_device_id *ent,
 199                            struct drm_driver *driver)
 200 {
 201         struct drm_device *dev;
 202         int ret;
 203
 204         DRM_DEBUG("\n");
 205
 206         dev = drm_dev_alloc(driver, &pdev->dev);
 207         if (IS_ERR(dev))
 208                 return PTR_ERR(dev);
 209
 210         ret = pci_enable_device(pdev);
 211         if (ret)
 212                 goto err_free;
 213
 214         dev->pdev = pdev;
 215 #ifdef __alpha__
 216         dev->hose = pdev->sysdata;
 217 #endif
 218
 219         if (drm_core_check_feature(dev, DRIVER_MODESET))
 220                 pci_set_drvdata(pdev, dev);
 221
 222         drm_pci_agp_init(dev);
 223
 224         ret = drm_dev_register(dev, ent->driver_data);
 225         if (ret)
 226                 goto err_agp;
 227
 228         /* No locking needed since shadow-attach is single-threaded since it may
 229          * only be called from the per-driver module init hook. */
 230         if (drm_core_check_feature(dev, DRIVER_LEGACY))
 231                 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
 232
 233         return 0;
 234
 235 err_agp:
 236         drm_pci_agp_destroy(dev);
 237         pci_disable_device(pdev);
 238 err_free:
 239         drm_dev_put(dev);
 240         return ret;
 241 }
 242
 243 /**
 244  * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver
 245  * @driver: DRM device driver
 246  * @pdriver: PCI device driver
 247  *
 248  * This is only used by legacy dri1 drivers and deprecated.
 249  *
 250  * Return: 0 on success or a negative error code on failure.
 251  */
 252 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 253 {
 254         struct pci_dev *pdev = NULL;
 255         const struct pci_device_id *pid;
 256         int i;
 257
 258         DRM_DEBUG("\n");
 259
 260         if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY)))
 261                 return -EINVAL;
 262
 263         /* If not using KMS, fall back to stealth mode manual scanning. */
 264         INIT_LIST_HEAD(&driver->legacy_dev_list);
 265         for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
 266                 pid = &pdriver->id_table[i];
 267
 268                 /* Loop around setting up a DRM device for each PCI device
 269                  * matching our ID and device class.  If we had the internal
 270                  * function that pci_get_subsys and pci_get_class used, we'd
 271                  * be able to just pass pid in instead of doing a two-stage
 272                  * thing.
 273                  */
 274                 pdev = NULL;
 275                 while ((pdev =
 276                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 277                                        pid->subdevice, pdev)) != NULL) {
 278                         if ((pdev->class & pid->class_mask) != pid->class)
 279                                 continue;
 280
 281                         /* stealth mode requires a manual probe */
 282                         pci_dev_get(pdev);
 283                         drm_get_pci_dev(pdev, pid, driver);
 284                 }
 285         }
 286         return 0;
 287 }
 288 EXPORT_SYMBOL(drm_legacy_pci_init);
 289
 290 /**
 291  * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver
 292  * @driver: DRM device driver
 293  * @pdriver: PCI device driver
 294  *
 295  * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This
 296  * is deprecated and only used by dri1 drivers.
 297  */
 298 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
 299 {
 300         struct drm_device *dev, *tmp;
 301
 302         DRM_DEBUG("\n");
 303
 304         if (!(driver->driver_features & DRIVER_LEGACY)) {
 305                 WARN_ON(1);
 306         } else {
 307                 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
 308                                          legacy_dev_list) {
 309                         list_del(&dev->legacy_dev_list);
 310                         drm_put_dev(dev);
 311                 }
 312         }
 313         DRM_INFO("Module unloaded\n");
 314 }
 315 EXPORT_SYMBOL(drm_legacy_pci_exit);
 316
 317 #endif