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drm_drv.c

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/**
 * \file drm_drv.c
 * Generic driver template
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 *
 * To use this template, you must at least define the following (samples
 * given for the MGA driver):
 *
 * \code
 * #define DRIVER_AUTHOR      "VA Linux Systems, Inc."
 *
 * #define DRIVER_NAME        "mga"
 * #define DRIVER_DESC        "Matrox G200/G400"
 * #define DRIVER_DATE        "20001127"
 *
 * #define drm_x        mga_##x
 * \endcode
 */

/*
 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
 *
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "drmP.h"
#include "drm_core.h"

static int drm_version(struct drm_device *dev, void *data,
                   struct drm_file *file_priv);

/** Ioctl table */
00056 static struct drm_ioctl_desc drm_ioctls[] = {
      DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0),
      DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
      DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
      DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0),
      DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
      DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
      DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER|DRM_ROOT_ONLY),

      DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

      DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),

      DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),

      DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
      DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),

      DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

      DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
      DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),

      DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),

      DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
      DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
      DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
      /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
      DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),

      DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

#if __OS_HAS_AGP
      DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
      DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
#endif

      DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
      DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

      DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0),

      DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
};

#define DRM_CORE_IOCTL_COUNT  ARRAY_SIZE( drm_ioctls )

/**
 * Take down the DRM device.
 *
 * \param dev DRM device structure.
 *
 * Frees every resource in \p dev.
 *
 * \sa drm_device
 */
00133 int drm_lastclose(struct drm_device * dev)
{
      struct drm_magic_entry *pt, *next;
      struct drm_map_list *r_list, *list_t;
      struct drm_vma_entry *vma, *vma_temp;
      int i;

      DRM_DEBUG("\n");

      if (dev->driver->lastclose)
            dev->driver->lastclose(dev);
      DRM_DEBUG("driver lastclose completed\n");

      if (dev->unique) {
            drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
            dev->unique = NULL;
            dev->unique_len = 0;
      }

      if (dev->irq_enabled)
            drm_irq_uninstall(dev);

      mutex_lock(&dev->struct_mutex);

      /* Free drawable information memory */
      drm_drawable_free_all(dev);
      del_timer(&dev->timer);

      /* Clear pid list */
      if (dev->magicfree.next) {
            list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
                  list_del(&pt->head);
                  drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
                  drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
            }
            drm_ht_remove(&dev->magiclist);
      }

      /* Clear AGP information */
      if (drm_core_has_AGP(dev) && dev->agp) {
            struct drm_agp_mem *entry, *tempe;

            /* Remove AGP resources, but leave dev->agp
               intact until drv_cleanup is called. */
            list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
                  if (entry->bound)
                        drm_unbind_agp(entry->memory);
                  drm_free_agp(entry->memory, entry->pages);
                  drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
            }
            INIT_LIST_HEAD(&dev->agp->memory);

            if (dev->agp->acquired)
                  drm_agp_release(dev);

            dev->agp->acquired = 0;
            dev->agp->enabled = 0;
      }
      if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
            drm_sg_cleanup(dev->sg);
            dev->sg = NULL;
      }

      /* Clear vma list (only built for debugging) */
      list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
            list_del(&vma->head);
            drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
      }

      list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
            drm_rmmap_locked(dev, r_list->map);
            r_list = NULL;
      }

      if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
            for (i = 0; i < dev->queue_count; i++) {
                  if (dev->queuelist[i]) {
                        drm_free(dev->queuelist[i],
                               sizeof(*dev->queuelist[0]),
                               DRM_MEM_QUEUES);
                        dev->queuelist[i] = NULL;
                  }
            }
            drm_free(dev->queuelist,
                   dev->queue_slots * sizeof(*dev->queuelist),
                   DRM_MEM_QUEUES);
            dev->queuelist = NULL;
      }
      dev->queue_count = 0;

      if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
            drm_dma_takedown(dev);

      if (dev->lock.hw_lock) {
            dev->sigdata.lock = dev->lock.hw_lock = NULL;   /* SHM removed */
            dev->lock.file_priv = NULL;
            wake_up_interruptible(&dev->lock.lock_queue);
      }
      mutex_unlock(&dev->struct_mutex);

      DRM_DEBUG("lastclose completed\n");
      return 0;
}

/**
 * Module initialization. Called via init_module at module load time, or via
 * linux/init/main.c (this is not currently supported).
 *
 * \return zero on success or a negative number on failure.
 *
 * Initializes an array of drm_device structures, and attempts to
 * initialize all available devices, using consecutive minors, registering the
 * stubs and initializing the AGP device.
 *
 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 * after the initialization for driver customization.
 */
00250 int drm_init(struct drm_driver *driver)
{
      struct pci_dev *pdev = NULL;
      struct pci_device_id *pid;
      int i;

      DRM_DEBUG("\n");

      drm_mem_init();

      for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
            pid = (struct pci_device_id *)&driver->pci_driver.id_table[i];

            pdev = NULL;
            /* pass back in pdev to account for multiple identical cards */
            while ((pdev =
                  pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
                               pid->subdevice, pdev)) != NULL) {
                  /* stealth mode requires a manual probe */
                  pci_dev_get(pdev);
                  drm_get_dev(pdev, pid, driver);
            }
      }
      return 0;
}

EXPORT_SYMBOL(drm_init);

/**
 * Called via cleanup_module() at module unload time.
 *
 * Cleans up all DRM device, calling drm_lastclose().
 *
 * \sa drm_init
 */
00285 static void drm_cleanup(struct drm_device * dev)
{
      DRM_DEBUG("\n");

      if (!dev) {
            DRM_ERROR("cleanup called no dev\n");
            return;
      }

      drm_lastclose(dev);

      drm_ht_remove(&dev->map_hash);

      drm_ctxbitmap_cleanup(dev);

      if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
          dev->agp && dev->agp->agp_mtrr >= 0) {
            int retval;
            retval = mtrr_del(dev->agp->agp_mtrr,
                          dev->agp->agp_info.aper_base,
                          dev->agp->agp_info.aper_size * 1024 * 1024);
            DRM_DEBUG("mtrr_del=%d\n", retval);
      }

      if (drm_core_has_AGP(dev) && dev->agp) {
            drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
            dev->agp = NULL;
      }

      if (dev->driver->unload)
            dev->driver->unload(dev);

      drm_put_head(&dev->primary);
      if (drm_put_dev(dev))
            DRM_ERROR("Cannot unload module\n");
}

void drm_exit(struct drm_driver *driver)
{
      int i;
      struct drm_device *dev = NULL;
      struct drm_head *head;

      DRM_DEBUG("\n");

      for (i = 0; i < drm_cards_limit; i++) {
            head = drm_heads[i];
            if (!head)
                  continue;
            if (!head->dev)
                  continue;
            if (head->dev->driver != driver)
                  continue;
            dev = head->dev;
            if (dev) {
                  /* release the pci driver */
                  if (dev->pdev)
                        pci_dev_put(dev->pdev);
                  drm_cleanup(dev);
            }
      }
      DRM_INFO("Module unloaded\n");
}

EXPORT_SYMBOL(drm_exit);

/** File operations structure */
00352 static const struct file_operations drm_stub_fops = {
      .owner = THIS_MODULE,
      .open = drm_stub_open
};

static int __init drm_core_init(void)
{
      int ret = -ENOMEM;

      drm_cards_limit =
          (drm_cards_limit <
           DRM_MAX_MINOR + 1 ? drm_cards_limit : DRM_MAX_MINOR + 1);
      drm_heads =
          drm_calloc(drm_cards_limit, sizeof(*drm_heads), DRM_MEM_STUB);
      if (!drm_heads)
            goto err_p1;

      if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
            goto err_p1;

      drm_class = drm_sysfs_create(THIS_MODULE, "drm");
      if (IS_ERR(drm_class)) {
            printk(KERN_ERR "DRM: Error creating drm class.\n");
            ret = PTR_ERR(drm_class);
            goto err_p2;
      }

      drm_proc_root = proc_mkdir("dri", NULL);
      if (!drm_proc_root) {
            DRM_ERROR("Cannot create /proc/dri\n");
            ret = -1;
            goto err_p3;
      }

      DRM_INFO("Initialized %s %d.%d.%d %s\n",
             CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
      return 0;
      err_p3:
      drm_sysfs_destroy(drm_class);
      err_p2:
      unregister_chrdev(DRM_MAJOR, "drm");
      drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
      err_p1:
      return ret;
}

static void __exit drm_core_exit(void)
{
      remove_proc_entry("dri", NULL);
      drm_sysfs_destroy(drm_class);

      unregister_chrdev(DRM_MAJOR, "drm");

      drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
}

module_init(drm_core_init);
module_exit(drm_core_exit);

/**
 * Get version information
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_version structure.
 * \return zero on success or negative number on failure.
 *
 * Fills in the version information in \p arg.
 */
00422 static int drm_version(struct drm_device *dev, void *data,
                   struct drm_file *file_priv)
{
      struct drm_version *version = data;
      int len;

      version->version_major = dev->driver->major;
      version->version_minor = dev->driver->minor;
      version->version_patchlevel = dev->driver->patchlevel;
      DRM_COPY(version->name, dev->driver->name);
      DRM_COPY(version->date, dev->driver->date);
      DRM_COPY(version->desc, dev->driver->desc);

      return 0;
}

/**
 * Called whenever a process performs an ioctl on /dev/drm.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or negative number on failure.
 *
 * Looks up the ioctl function in the ::ioctls table, checking for root
 * previleges if so required, and dispatches to the respective function.
 */
00450 int drm_ioctl(struct inode *inode, struct file *filp,
            unsigned int cmd, unsigned long arg)
{
      struct drm_file *file_priv = filp->private_data;
      struct drm_device *dev = file_priv->head->dev;
      struct drm_ioctl_desc *ioctl;
      drm_ioctl_t *func;
      unsigned int nr = DRM_IOCTL_NR(cmd);
      int retcode = -EINVAL;
      char *kdata = NULL;

      atomic_inc(&dev->ioctl_count);
      atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
      ++file_priv->ioctl_count;

      DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
              task_pid_nr(current), cmd, nr,
              (long)old_encode_dev(file_priv->head->device),
              file_priv->authenticated);

      if ((nr >= DRM_CORE_IOCTL_COUNT) &&
          ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
            goto err_i1;
      if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
          (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
            ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
      else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE))
            ioctl = &drm_ioctls[nr];
      else
            goto err_i1;

      func = ioctl->func;
      /* is there a local override? */
      if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
            func = dev->driver->dma_ioctl;


      if (!func) {
            DRM_DEBUG("no function\n");
            retcode = -EINVAL;
      } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
               ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
               ((ioctl->flags & DRM_MASTER) && !file_priv->master)) {
            retcode = -EACCES;
      } else {
            if (cmd & (IOC_IN | IOC_OUT)) {
                  kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
                  if (!kdata)
                        return -ENOMEM;
            }

            if (cmd & IOC_IN) {
                  if (copy_from_user(kdata, (void __user *)arg,
                                 _IOC_SIZE(cmd)) != 0) {
                        retcode = -EACCES;
                        goto err_i1;
                  }
            }
            retcode = func(dev, kdata, file_priv);

            if (cmd & IOC_OUT) {
                  if (copy_to_user((void __user *)arg, kdata,
                               _IOC_SIZE(cmd)) != 0)
                        retcode = -EACCES;
            }
      }

      err_i1:
      if (kdata)
            kfree(kdata);
      atomic_dec(&dev->ioctl_count);
      if (retcode)
            DRM_DEBUG("ret = %x\n", retcode);
      return retcode;
}

EXPORT_SYMBOL(drm_ioctl);

drm_local_map_t *drm_getsarea(struct drm_device *dev)
{
      struct drm_map_list *entry;

      list_for_each_entry(entry, &dev->maplist, head) {
            if (entry->map && entry->map->type == _DRM_SHM &&
                (entry->map->flags & _DRM_CONTAINS_LOCK)) {
                  return entry->map;
            }
      }
      return NULL;
}
EXPORT_SYMBOL(drm_getsarea);

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