release/src-rt-6.x.4708/linux/linux-2.6.36/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 "drmP.h"
  43
  44 /**********************************************************************/
  45 /** \name PCI memory */
  46 /*@{*/
  47
  48 /**
  49  * \brief Allocate a PCI consistent memory block, for DMA.
  50  */
  51 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
  52 {
  53         drm_dma_handle_t *dmah;
  54         unsigned long addr;
  55         size_t sz;
  56
  57         /* pci_alloc_consistent only guarantees alignment to the smallest
  58          * PAGE_SIZE order which is greater than or equal to the requested size.
  59          * Return NULL here for now to make sure nobody tries for larger alignment
  60          */
  61         if (align > size)
  62                 return NULL;
  63
  64         dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
  65         if (!dmah)
  66                 return NULL;
  67
  68         dmah->size = size;
  69         dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
  70
  71         if (dmah->vaddr == NULL) {
  72                 kfree(dmah);
  73                 return NULL;
  74         }
  75
  76         memset(dmah->vaddr, 0, size);
  77
  78         /* Reserve */
  79         for (addr = (unsigned long)dmah->vaddr, sz = size;
  80              sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
  81                 SetPageReserved(virt_to_page(addr));
  82         }
  83
  84         return dmah;
  85 }
  86
  87 EXPORT_SYMBOL(drm_pci_alloc);
  88
  89 /**
  90  * \brief Free a PCI consistent memory block without freeing its descriptor.
  91  *
  92  * This function is for internal use in the Linux-specific DRM core code.
  93  */
  94 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
  95 {
  96         unsigned long addr;
  97         size_t sz;
  98
  99         if (dmah->vaddr) {
 100                 /* Unreserve */
 101                 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
 102                      sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
 103                         ClearPageReserved(virt_to_page(addr));
 104                 }
 105                 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
 106                                   dmah->busaddr);
 107         }
 108 }
 109
 110 /**
 111  * \brief Free a PCI consistent memory block
 112  */
 113 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
 114 {
 115         __drm_pci_free(dev, dmah);
 116         kfree(dmah);
 117 }
 118
 119 EXPORT_SYMBOL(drm_pci_free);
 120
 121 #ifdef CONFIG_PCI
 122 /**
 123  * Register.
 124  *
 125  * \param pdev - PCI device structure
 126  * \param ent entry from the PCI ID table with device type flags
 127  * \return zero on success or a negative number on failure.
 128  *
 129  * Attempt to gets inter module "drm" information. If we are first
 130  * then register the character device and inter module information.
 131  * Try and register, if we fail to register, backout previous work.
 132  */
 133 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 134                     struct drm_driver *driver)
 135 {
 136         struct drm_device *dev;
 137         int ret;
 138
 139         DRM_DEBUG("\n");
 140
 141         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 142         if (!dev)
 143                 return -ENOMEM;
 144
 145         ret = pci_enable_device(pdev);
 146         if (ret)
 147                 goto err_g1;
 148
 149         pci_set_master(pdev);
 150
 151         dev->pdev = pdev;
 152         dev->dev = &pdev->dev;
 153
 154         dev->pci_device = pdev->device;
 155         dev->pci_vendor = pdev->vendor;
 156
 157 #ifdef __alpha__
 158         dev->hose = pdev->sysdata;
 159 #endif
 160
 161         mutex_lock(&drm_global_mutex);
 162
 163         if ((ret = drm_fill_in_dev(dev, ent, driver))) {
 164                 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
 165                 goto err_g2;
 166         }
 167
 168         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 169                 pci_set_drvdata(pdev, dev);
 170                 ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
 171                 if (ret)
 172                         goto err_g2;
 173         }
 174
 175         if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
 176                 goto err_g3;
 177
 178         if (dev->driver->load) {
 179                 ret = dev->driver->load(dev, ent->driver_data);
 180                 if (ret)
 181                         goto err_g4;
 182         }
 183
 184         /* setup the grouping for the legacy output */
 185         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 186                 ret = drm_mode_group_init_legacy_group(dev,
 187                                                 &dev->primary->mode_group);
 188                 if (ret)
 189                         goto err_g4;
 190         }
 191
 192         list_add_tail(&dev->driver_item, &driver->device_list);
 193
 194         DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
 195                  driver->name, driver->major, driver->minor, driver->patchlevel,
 196                  driver->date, pci_name(pdev), dev->primary->index);
 197
 198         mutex_unlock(&drm_global_mutex);
 199         return 0;
 200
 201 err_g4:
 202         drm_put_minor(&dev->primary);
 203 err_g3:
 204         if (drm_core_check_feature(dev, DRIVER_MODESET))
 205                 drm_put_minor(&dev->control);
 206 err_g2:
 207         pci_disable_device(pdev);
 208 err_g1:
 209         kfree(dev);
 210         mutex_unlock(&drm_global_mutex);
 211         return ret;
 212 }
 213 EXPORT_SYMBOL(drm_get_pci_dev);
 214
 215 /**
 216  * PCI device initialization. Called via drm_init at module load time,
 217  *
 218  * \return zero on success or a negative number on failure.
 219  *
 220  * Initializes a drm_device structures,registering the
 221  * stubs and initializing the AGP device.
 222  *
 223  * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 224  * after the initialization for driver customization.
 225  */
 226 int drm_pci_init(struct drm_driver *driver)
 227 {
 228         struct pci_dev *pdev = NULL;
 229         const struct pci_device_id *pid;
 230         int i;
 231
 232         if (driver->driver_features & DRIVER_MODESET)
 233                 return pci_register_driver(&driver->pci_driver);
 234
 235         /* If not using KMS, fall back to stealth mode manual scanning. */
 236         for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
 237                 pid = &driver->pci_driver.id_table[i];
 238
 239                 /* Loop around setting up a DRM device for each PCI device
 240                  * matching our ID and device class.  If we had the internal
 241                  * function that pci_get_subsys and pci_get_class used, we'd
 242                  * be able to just pass pid in instead of doing a two-stage
 243                  * thing.
 244                  */
 245                 pdev = NULL;
 246                 while ((pdev =
 247                         pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
 248                                        pid->subdevice, pdev)) != NULL) {
 249                         if ((pdev->class & pid->class_mask) != pid->class)
 250                                 continue;
 251
 252                         /* stealth mode requires a manual probe */
 253                         pci_dev_get(pdev);
 254                         drm_get_pci_dev(pdev, pid, driver);
 255                 }
 256         }
 257         return 0;
 258 }
 259
 260 #else
 261
 262 int drm_pci_init(struct drm_driver *driver)
 263 {
 264         return -1;
 265 }
 266
 267 #endif
 268 /*@}*/