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drm_ioctl.c

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/**
 * \file drm_ioctl.c
 * IOCTL processing for DRM
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Fri Jan  8 09:01:26 1999 by faith@valinux.com
 *
 * Copyright 1999 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"

#include "linux/pci.h"

/**
 * Get the bus id.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_unique structure.
 * \return zero on success or a negative number on failure.
 *
 * Copies the bus id from drm_device::unique into user space.
 */
00052 int drm_getunique(struct drm_device *dev, void *data,
              struct drm_file *file_priv)
{
      struct drm_unique *u = data;

      if (u->unique_len >= dev->unique_len) {
            if (copy_to_user(u->unique, dev->unique, dev->unique_len))
                  return -EFAULT;
      }
      u->unique_len = dev->unique_len;

      return 0;
}

/**
 * Set the bus id.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_unique structure.
 * \return zero on success or a negative number on failure.
 *
 * Copies the bus id from userspace into drm_device::unique, and verifies that
 * it matches the device this DRM is attached to (EINVAL otherwise).  Deprecated
 * in interface version 1.1 and will return EBUSY when setversion has requested
 * version 1.1 or greater.
 */
00080 int drm_setunique(struct drm_device *dev, void *data,
              struct drm_file *file_priv)
{
      struct drm_unique *u = data;
      int domain, bus, slot, func, ret;

      if (dev->unique_len || dev->unique)
            return -EBUSY;

      if (!u->unique_len || u->unique_len > 1024)
            return -EINVAL;

      dev->unique_len = u->unique_len;
      dev->unique = drm_alloc(u->unique_len + 1, DRM_MEM_DRIVER);
      if (!dev->unique)
            return -ENOMEM;
      if (copy_from_user(dev->unique, u->unique, dev->unique_len))
            return -EFAULT;

      dev->unique[dev->unique_len] = '\0';

      dev->devname =
          drm_alloc(strlen(dev->driver->pci_driver.name) +
                  strlen(dev->unique) + 2, DRM_MEM_DRIVER);
      if (!dev->devname)
            return -ENOMEM;

      sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
            dev->unique);

      /* Return error if the busid submitted doesn't match the device's actual
       * busid.
       */
      ret = sscanf(dev->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
      if (ret != 3)
            return -EINVAL;
      domain = bus >> 8;
      bus &= 0xff;

      if ((domain != drm_get_pci_domain(dev)) ||
          (bus != dev->pdev->bus->number) ||
          (slot != PCI_SLOT(dev->pdev->devfn)) ||
          (func != PCI_FUNC(dev->pdev->devfn)))
            return -EINVAL;

      return 0;
}

static int drm_set_busid(struct drm_device * dev)
{
      int len;

      if (dev->unique != NULL)
            return 0;

      dev->unique_len = 40;
      dev->unique = drm_alloc(dev->unique_len + 1, DRM_MEM_DRIVER);
      if (dev->unique == NULL)
            return -ENOMEM;

      len = snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d",
                   drm_get_pci_domain(dev), dev->pdev->bus->number,
                   PCI_SLOT(dev->pdev->devfn),
                   PCI_FUNC(dev->pdev->devfn));

      if (len > dev->unique_len)
            DRM_ERROR("Unique buffer overflowed\n");

      dev->devname =
          drm_alloc(strlen(dev->driver->pci_driver.name) + dev->unique_len +
                  2, DRM_MEM_DRIVER);
      if (dev->devname == NULL)
            return -ENOMEM;

      sprintf(dev->devname, "%s@%s", dev->driver->pci_driver.name,
            dev->unique);

      return 0;
}

/**
 * Get a mapping information.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_map structure.
 *
 * \return zero on success or a negative number on failure.
 *
 * Searches for the mapping with the specified offset and copies its information
 * into userspace
 */
00173 int drm_getmap(struct drm_device *dev, void *data,
             struct drm_file *file_priv)
{
      struct drm_map *map = data;
      struct drm_map_list *r_list = NULL;
      struct list_head *list;
      int idx;
      int i;

      idx = map->offset;

      mutex_lock(&dev->struct_mutex);
      if (idx < 0) {
            mutex_unlock(&dev->struct_mutex);
            return -EINVAL;
      }

      i = 0;
      list_for_each(list, &dev->maplist) {
            if (i == idx) {
                  r_list = list_entry(list, struct drm_map_list, head);
                  break;
            }
            i++;
      }
      if (!r_list || !r_list->map) {
            mutex_unlock(&dev->struct_mutex);
            return -EINVAL;
      }

      map->offset = r_list->map->offset;
      map->size = r_list->map->size;
      map->type = r_list->map->type;
      map->flags = r_list->map->flags;
      map->handle = (void *)(unsigned long) r_list->user_token;
      map->mtrr = r_list->map->mtrr;
      mutex_unlock(&dev->struct_mutex);

      return 0;
}

/**
 * Get client information.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_client structure.
 *
 * \return zero on success or a negative number on failure.
 *
 * Searches for the client with the specified index and copies its information
 * into userspace
 */
00227 int drm_getclient(struct drm_device *dev, void *data,
              struct drm_file *file_priv)
{
      struct drm_client *client = data;
      struct drm_file *pt;
      int idx;
      int i;

      idx = client->idx;
      mutex_lock(&dev->struct_mutex);
      
      if (list_empty(&dev->filelist)) {
            mutex_unlock(&dev->struct_mutex);
            return -EINVAL;
      }

      i = 0;
      list_for_each_entry(pt, &dev->filelist, lhead) {
            if (i++ >= idx)
                  break;
      }

      client->auth = pt->authenticated;
      client->pid = pt->pid;
      client->uid = pt->uid;
      client->magic = pt->magic;
      client->iocs = pt->ioctl_count;
      mutex_unlock(&dev->struct_mutex);

      return 0;
}

/**
 * Get statistics information.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_stats structure.
 *
 * \return zero on success or a negative number on failure.
 */
00269 int drm_getstats(struct drm_device *dev, void *data,
             struct drm_file *file_priv)
{
      struct drm_stats *stats = data;
      int i;

      memset(stats, 0, sizeof(*stats));

      mutex_lock(&dev->struct_mutex);

      for (i = 0; i < dev->counters; i++) {
            if (dev->types[i] == _DRM_STAT_LOCK)
                  stats->data[i].value =
                      (dev->lock.hw_lock ? dev->lock.hw_lock->lock : 0);
            else
                  stats->data[i].value = atomic_read(&dev->counts[i]);
            stats->data[i].type = dev->types[i];
      }

      stats->count = dev->counters;

      mutex_unlock(&dev->struct_mutex);

      return 0;
}

/**
 * Setversion ioctl.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_lock structure.
 * \return zero on success or negative number on failure.
 *
 * Sets the requested interface version
 */
00306 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
      struct drm_set_version *sv = data;
      int if_version, retcode = 0;

      if (sv->drm_di_major != -1) {
            if (sv->drm_di_major != DRM_IF_MAJOR ||
                sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
                  retcode = -EINVAL;
                  goto done;
            }
            if_version = DRM_IF_VERSION(sv->drm_di_major,
                                  sv->drm_di_minor);
            dev->if_version = max(if_version, dev->if_version);
            if (sv->drm_di_minor >= 1) {
                  /*
                   * Version 1.1 includes tying of DRM to specific device
                   */
                  drm_set_busid(dev);
            }
      }

      if (sv->drm_dd_major != -1) {
            if (sv->drm_dd_major != dev->driver->major ||
                sv->drm_dd_minor < 0 || sv->drm_dd_minor >
                dev->driver->minor) {
                  retcode = -EINVAL;
                  goto done;
            }

            if (dev->driver->set_version)
                  dev->driver->set_version(dev, sv);
      }

done:
      sv->drm_di_major = DRM_IF_MAJOR;
      sv->drm_di_minor = DRM_IF_MINOR;
      sv->drm_dd_major = dev->driver->major;
      sv->drm_dd_minor = dev->driver->minor;

      return retcode;
}

/** No-op ioctl. */
00350 int drm_noop(struct drm_device *dev, void *data,
           struct drm_file *file_priv)
{
      DRM_DEBUG("\n");
      return 0;
}

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