Linux-2.6.12-rc2

[mirror_ubuntu-artful-kernel.git] / drivers / char / drm / drm_ioctl.c

/**
 * \file drm_ioctl.h 
 * 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 filp file pointer.
 * \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.
 */
int drm_getunique(struct inode *inode, struct file *filp,
                   unsigned int cmd, unsigned long arg)
{
        drm_file_t       *priv   = filp->private_data;
        drm_device_t     *dev    = priv->head->dev;
        drm_unique_t     __user *argp = (void __user *)arg;
        drm_unique_t     u;

        if (copy_from_user(&u, argp, sizeof(u)))
                return -EFAULT;
        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;
        if (copy_to_user(argp, &u, sizeof(u)))
                return -EFAULT;
        return 0;
}

/**
 * Set the bus id.
 * 
 * \param inode device inode.
 * \param filp file pointer.
 * \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.
 */
int drm_setunique(struct inode *inode, struct file *filp,
                   unsigned int cmd, unsigned long arg)
{
        drm_file_t       *priv   = filp->private_data;
        drm_device_t     *dev    = priv->head->dev;
        drm_unique_t     u;
        int              domain, bus, slot, func, ret;

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

        if (copy_from_user(&u, (drm_unique_t __user *)arg, sizeof(u)))
                return -EFAULT;

        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 DRM_ERR(EINVAL);
        domain = bus >> 8;
        bus &= 0xff;
        
        if ((domain != dev->pci_domain) ||
            (bus != dev->pci_bus) ||
            (slot != dev->pci_slot) ||
            (func != dev->pci_func))
                return -EINVAL;

        return 0;
}

static int
drm_set_busid(drm_device_t *dev)
{
        if (dev->unique != NULL)
                return EBUSY;

        dev->unique_len = 20;
        dev->unique = drm_alloc(dev->unique_len + 1, DRM_MEM_DRIVER);
        if (dev->unique == NULL)
                return ENOMEM;

        snprintf(dev->unique, dev->unique_len, "pci:%04x:%02x:%02x.%d",
                dev->pci_domain, dev->pci_bus, dev->pci_slot, dev->pci_func);

        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 filp file pointer.
 * \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
 */
int drm_getmap( struct inode *inode, struct file *filp,
                 unsigned int cmd, unsigned long arg )
{
        drm_file_t   *priv = filp->private_data;
        drm_device_t *dev  = priv->head->dev;
        drm_map_t    __user *argp = (void __user *)arg;
        drm_map_t    map;
        drm_map_list_t *r_list = NULL;
        struct list_head *list;
        int          idx;
        int          i;

        if (copy_from_user(&map, argp, sizeof(map)))
                return -EFAULT;
        idx = map.offset;

        down(&dev->struct_sem);
        if (idx < 0) {
                up(&dev->struct_sem);
                return -EINVAL;
        }

        i = 0;
        list_for_each(list, &dev->maplist->head) {
                if(i == idx) {
                        r_list = list_entry(list, drm_map_list_t, head);
                        break;
                }
                i++;
        }
        if(!r_list || !r_list->map) {
                up(&dev->struct_sem);
                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 = r_list->map->handle;
        map.mtrr   = r_list->map->mtrr;
        up(&dev->struct_sem);

        if (copy_to_user(argp, &map, sizeof(map))) return -EFAULT;
        return 0;
}

/**
 * Get client information.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \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
 */
int drm_getclient( struct inode *inode, struct file *filp,
                    unsigned int cmd, unsigned long arg )
{
        drm_file_t   *priv = filp->private_data;
        drm_device_t *dev  = priv->head->dev;
        drm_client_t __user *argp = (void __user *)arg;
        drm_client_t client;
        drm_file_t   *pt;
        int          idx;
        int          i;

        if (copy_from_user(&client, argp, sizeof(client)))
                return -EFAULT;
        idx = client.idx;
        down(&dev->struct_sem);
        for (i = 0, pt = dev->file_first; i < idx && pt; i++, pt = pt->next)
                ;

        if (!pt) {
                up(&dev->struct_sem);
                return -EINVAL;
        }
        client.auth  = pt->authenticated;
        client.pid   = pt->pid;
        client.uid   = pt->uid;
        client.magic = pt->magic;
        client.iocs  = pt->ioctl_count;
        up(&dev->struct_sem);

        if (copy_to_user((drm_client_t __user *)arg, &client, sizeof(client)))
                return -EFAULT;
        return 0;
}

/** 
 * Get statistics information. 
 * 
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_stats structure.
 * 
 * \return zero on success or a negative number on failure.
 */
int drm_getstats( struct inode *inode, struct file *filp,
                   unsigned int cmd, unsigned long arg )
{
        drm_file_t   *priv = filp->private_data;
        drm_device_t *dev  = priv->head->dev;
        drm_stats_t  stats;
        int          i;

        memset(&stats, 0, sizeof(stats));
        
        down(&dev->struct_sem);

        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;

        up(&dev->struct_sem);

        if (copy_to_user((drm_stats_t __user *)arg, &stats, sizeof(stats)))
                return -EFAULT;
        return 0;
}

/**
 * Setversion ioctl.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \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
 */
int drm_setversion(DRM_IOCTL_ARGS)
{
        DRM_DEVICE;
        drm_set_version_t sv;
        drm_set_version_t retv;
        int if_version;
        drm_set_version_t __user *argp = (void __user *)data;
        drm_version_t version;

        DRM_COPY_FROM_USER_IOCTL(sv, argp, sizeof(sv));

        memset(&version, 0, sizeof(version));

        dev->driver->version(&version);
        retv.drm_di_major = DRM_IF_MAJOR;
        retv.drm_di_minor = DRM_IF_MINOR;
        retv.drm_dd_major = version.version_major;
        retv.drm_dd_minor = version.version_minor;

        DRM_COPY_TO_USER_IOCTL(argp, retv, sizeof(sv));

        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)
                        return EINVAL;
                if_version = DRM_IF_VERSION(sv.drm_di_major, sv.drm_dd_minor);
                dev->if_version = DRM_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 != version.version_major ||
                    sv.drm_dd_minor < 0 || sv.drm_dd_minor > version.version_minor)
                        return EINVAL;

                if (dev->driver->set_version)
                        dev->driver->set_version(dev, &sv);
        }
        return 0;
}

/** No-op ioctl. */
int drm_noop(struct inode *inode, struct file *filp, unsigned int cmd,
               unsigned long arg)
{
        DRM_DEBUG("\n");
        return 0;
}