Merge branch 'irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip...

[linux-2.6] / drivers / gpu / drm / drm_ioc32.c

/**
 * \file drm_ioc32.c
 *
 * 32-bit ioctl compatibility routines for the DRM.
 *
 * \author Paul Mackerras <paulus@samba.org>
 *
 * Copyright (C) Paul Mackerras 2005.
 * 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
 * THE AUTHOR 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 <linux/compat.h>

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

#define DRM_IOCTL_VERSION32             DRM_IOWR(0x00, drm_version32_t)
#define DRM_IOCTL_GET_UNIQUE32          DRM_IOWR(0x01, drm_unique32_t)
#define DRM_IOCTL_GET_MAP32             DRM_IOWR(0x04, drm_map32_t)
#define DRM_IOCTL_GET_CLIENT32          DRM_IOWR(0x05, drm_client32_t)
#define DRM_IOCTL_GET_STATS32           DRM_IOR( 0x06, drm_stats32_t)

#define DRM_IOCTL_SET_UNIQUE32          DRM_IOW( 0x10, drm_unique32_t)
#define DRM_IOCTL_ADD_MAP32             DRM_IOWR(0x15, drm_map32_t)
#define DRM_IOCTL_ADD_BUFS32            DRM_IOWR(0x16, drm_buf_desc32_t)
#define DRM_IOCTL_MARK_BUFS32           DRM_IOW( 0x17, drm_buf_desc32_t)
#define DRM_IOCTL_INFO_BUFS32           DRM_IOWR(0x18, drm_buf_info32_t)
#define DRM_IOCTL_MAP_BUFS32            DRM_IOWR(0x19, drm_buf_map32_t)
#define DRM_IOCTL_FREE_BUFS32           DRM_IOW( 0x1a, drm_buf_free32_t)

#define DRM_IOCTL_RM_MAP32              DRM_IOW( 0x1b, drm_map32_t)

#define DRM_IOCTL_SET_SAREA_CTX32       DRM_IOW( 0x1c, drm_ctx_priv_map32_t)
#define DRM_IOCTL_GET_SAREA_CTX32       DRM_IOWR(0x1d, drm_ctx_priv_map32_t)

#define DRM_IOCTL_RES_CTX32             DRM_IOWR(0x26, drm_ctx_res32_t)
#define DRM_IOCTL_DMA32                 DRM_IOWR(0x29, drm_dma32_t)

#define DRM_IOCTL_AGP_ENABLE32          DRM_IOW( 0x32, drm_agp_mode32_t)
#define DRM_IOCTL_AGP_INFO32            DRM_IOR( 0x33, drm_agp_info32_t)
#define DRM_IOCTL_AGP_ALLOC32           DRM_IOWR(0x34, drm_agp_buffer32_t)
#define DRM_IOCTL_AGP_FREE32            DRM_IOW( 0x35, drm_agp_buffer32_t)
#define DRM_IOCTL_AGP_BIND32            DRM_IOW( 0x36, drm_agp_binding32_t)
#define DRM_IOCTL_AGP_UNBIND32          DRM_IOW( 0x37, drm_agp_binding32_t)

#define DRM_IOCTL_SG_ALLOC32            DRM_IOW( 0x38, drm_scatter_gather32_t)
#define DRM_IOCTL_SG_FREE32             DRM_IOW( 0x39, drm_scatter_gather32_t)

#define DRM_IOCTL_UPDATE_DRAW32         DRM_IOW( 0x3f, drm_update_draw32_t)

#define DRM_IOCTL_WAIT_VBLANK32         DRM_IOWR(0x3a, drm_wait_vblank32_t)

typedef struct drm_version_32 {
        int version_major;        /**< Major version */
        int version_minor;        /**< Minor version */
        int version_patchlevel;    /**< Patch level */
        u32 name_len;             /**< Length of name buffer */
        u32 name;                 /**< Name of driver */
        u32 date_len;             /**< Length of date buffer */
        u32 date;                 /**< User-space buffer to hold date */
        u32 desc_len;             /**< Length of desc buffer */
        u32 desc;                 /**< User-space buffer to hold desc */
} drm_version32_t;

static int compat_drm_version(struct file *file, unsigned int cmd,
                              unsigned long arg)
{
        drm_version32_t v32;
        struct drm_version __user *version;
        int err;

        if (copy_from_user(&v32, (void __user *)arg, sizeof(v32)))
                return -EFAULT;

        version = compat_alloc_user_space(sizeof(*version));
        if (!access_ok(VERIFY_WRITE, version, sizeof(*version)))
                return -EFAULT;
        if (__put_user(v32.name_len, &version->name_len)
            || __put_user((void __user *)(unsigned long)v32.name,
                          &version->name)
            || __put_user(v32.date_len, &version->date_len)
            || __put_user((void __user *)(unsigned long)v32.date,
                          &version->date)
            || __put_user(v32.desc_len, &version->desc_len)
            || __put_user((void __user *)(unsigned long)v32.desc,
                          &version->desc))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_VERSION, (unsigned long)version);
        if (err)
                return err;

        if (__get_user(v32.version_major, &version->version_major)
            || __get_user(v32.version_minor, &version->version_minor)
            || __get_user(v32.version_patchlevel, &version->version_patchlevel)
            || __get_user(v32.name_len, &version->name_len)
            || __get_user(v32.date_len, &version->date_len)
            || __get_user(v32.desc_len, &version->desc_len))
                return -EFAULT;

        if (copy_to_user((void __user *)arg, &v32, sizeof(v32)))
                return -EFAULT;
        return 0;
}

typedef struct drm_unique32 {
        u32 unique_len; /**< Length of unique */
        u32 unique;     /**< Unique name for driver instantiation */
} drm_unique32_t;

static int compat_drm_getunique(struct file *file, unsigned int cmd,
                                unsigned long arg)
{
        drm_unique32_t uq32;
        struct drm_unique __user *u;
        int err;

        if (copy_from_user(&uq32, (void __user *)arg, sizeof(uq32)))
                return -EFAULT;

        u = compat_alloc_user_space(sizeof(*u));
        if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
                return -EFAULT;
        if (__put_user(uq32.unique_len, &u->unique_len)
            || __put_user((void __user *)(unsigned long)uq32.unique,
                          &u->unique))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_GET_UNIQUE, (unsigned long)u);
        if (err)
                return err;

        if (__get_user(uq32.unique_len, &u->unique_len))
                return -EFAULT;
        if (copy_to_user((void __user *)arg, &uq32, sizeof(uq32)))
                return -EFAULT;
        return 0;
}

static int compat_drm_setunique(struct file *file, unsigned int cmd,
                                unsigned long arg)
{
        drm_unique32_t uq32;
        struct drm_unique __user *u;

        if (copy_from_user(&uq32, (void __user *)arg, sizeof(uq32)))
                return -EFAULT;

        u = compat_alloc_user_space(sizeof(*u));
        if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
                return -EFAULT;
        if (__put_user(uq32.unique_len, &u->unique_len)
            || __put_user((void __user *)(unsigned long)uq32.unique,
                          &u->unique))
                return -EFAULT;

        return drm_ioctl(file->f_path.dentry->d_inode, file,
                         DRM_IOCTL_SET_UNIQUE, (unsigned long)u);
}

typedef struct drm_map32 {
        u32 offset;             /**< Requested physical address (0 for SAREA)*/
        u32 size;               /**< Requested physical size (bytes) */
        enum drm_map_type type; /**< Type of memory to map */
        enum drm_map_flags flags;       /**< Flags */
        u32 handle;             /**< User-space: "Handle" to pass to mmap() */
        int mtrr;               /**< MTRR slot used */
} drm_map32_t;

static int compat_drm_getmap(struct file *file, unsigned int cmd,
                             unsigned long arg)
{
        drm_map32_t __user *argp = (void __user *)arg;
        drm_map32_t m32;
        struct drm_map __user *map;
        int idx, err;
        void *handle;

        if (get_user(idx, &argp->offset))
                return -EFAULT;

        map = compat_alloc_user_space(sizeof(*map));
        if (!access_ok(VERIFY_WRITE, map, sizeof(*map)))
                return -EFAULT;
        if (__put_user(idx, &map->offset))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_GET_MAP, (unsigned long)map);
        if (err)
                return err;

        if (__get_user(m32.offset, &map->offset)
            || __get_user(m32.size, &map->size)
            || __get_user(m32.type, &map->type)
            || __get_user(m32.flags, &map->flags)
            || __get_user(handle, &map->handle)
            || __get_user(m32.mtrr, &map->mtrr))
                return -EFAULT;

        m32.handle = (unsigned long)handle;
        if (copy_to_user(argp, &m32, sizeof(m32)))
                return -EFAULT;
        return 0;

}

static int compat_drm_addmap(struct file *file, unsigned int cmd,
                             unsigned long arg)
{
        drm_map32_t __user *argp = (void __user *)arg;
        drm_map32_t m32;
        struct drm_map __user *map;
        int err;
        void *handle;

        if (copy_from_user(&m32, argp, sizeof(m32)))
                return -EFAULT;

        map = compat_alloc_user_space(sizeof(*map));
        if (!access_ok(VERIFY_WRITE, map, sizeof(*map)))
                return -EFAULT;
        if (__put_user(m32.offset, &map->offset)
            || __put_user(m32.size, &map->size)
            || __put_user(m32.type, &map->type)
            || __put_user(m32.flags, &map->flags))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_ADD_MAP, (unsigned long)map);
        if (err)
                return err;

        if (__get_user(m32.offset, &map->offset)
            || __get_user(m32.mtrr, &map->mtrr)
            || __get_user(handle, &map->handle))
                return -EFAULT;

        m32.handle = (unsigned long)handle;
        if (m32.handle != (unsigned long)handle && printk_ratelimit())
                printk(KERN_ERR "compat_drm_addmap truncated handle"
                       " %p for type %d offset %x\n",
                       handle, m32.type, m32.offset);

        if (copy_to_user(argp, &m32, sizeof(m32)))
                return -EFAULT;

        return 0;
}

static int compat_drm_rmmap(struct file *file, unsigned int cmd,
                            unsigned long arg)
{
        drm_map32_t __user *argp = (void __user *)arg;
        struct drm_map __user *map;
        u32 handle;

        if (get_user(handle, &argp->handle))
                return -EFAULT;

        map = compat_alloc_user_space(sizeof(*map));
        if (!access_ok(VERIFY_WRITE, map, sizeof(*map)))
                return -EFAULT;
        if (__put_user((void *)(unsigned long)handle, &map->handle))
                return -EFAULT;

        return drm_ioctl(file->f_path.dentry->d_inode, file,
                         DRM_IOCTL_RM_MAP, (unsigned long)map);
}

typedef struct drm_client32 {
        int idx;        /**< Which client desired? */
        int auth;       /**< Is client authenticated? */
        u32 pid;        /**< Process ID */
        u32 uid;        /**< User ID */
        u32 magic;      /**< Magic */
        u32 iocs;       /**< Ioctl count */
} drm_client32_t;

static int compat_drm_getclient(struct file *file, unsigned int cmd,
                                unsigned long arg)
{
        drm_client32_t c32;
        drm_client32_t __user *argp = (void __user *)arg;
        struct drm_client __user *client;
        int idx, err;

        if (get_user(idx, &argp->idx))
                return -EFAULT;

        client = compat_alloc_user_space(sizeof(*client));
        if (!access_ok(VERIFY_WRITE, client, sizeof(*client)))
                return -EFAULT;
        if (__put_user(idx, &client->idx))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_GET_CLIENT, (unsigned long)client);
        if (err)
                return err;

        if (__get_user(c32.auth, &client->auth)
            || __get_user(c32.pid, &client->pid)
            || __get_user(c32.uid, &client->uid)
            || __get_user(c32.magic, &client->magic)
            || __get_user(c32.iocs, &client->iocs))
                return -EFAULT;

        if (copy_to_user(argp, &c32, sizeof(c32)))
                return -EFAULT;
        return 0;
}

typedef struct drm_stats32 {
        u32 count;
        struct {
                u32 value;
                enum drm_stat_type type;
        } data[15];
} drm_stats32_t;

static int compat_drm_getstats(struct file *file, unsigned int cmd,
                               unsigned long arg)
{
        drm_stats32_t s32;
        drm_stats32_t __user *argp = (void __user *)arg;
        struct drm_stats __user *stats;
        int i, err;

        stats = compat_alloc_user_space(sizeof(*stats));
        if (!access_ok(VERIFY_WRITE, stats, sizeof(*stats)))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_GET_STATS, (unsigned long)stats);
        if (err)
                return err;

        if (__get_user(s32.count, &stats->count))
                return -EFAULT;
        for (i = 0; i < 15; ++i)
                if (__get_user(s32.data[i].value, &stats->data[i].value)
                    || __get_user(s32.data[i].type, &stats->data[i].type))
                        return -EFAULT;

        if (copy_to_user(argp, &s32, sizeof(s32)))
                return -EFAULT;
        return 0;
}

typedef struct drm_buf_desc32 {
        int count;               /**< Number of buffers of this size */
        int size;                /**< Size in bytes */
        int low_mark;            /**< Low water mark */
        int high_mark;           /**< High water mark */
        int flags;
        u32 agp_start;           /**< Start address in the AGP aperture */
} drm_buf_desc32_t;

static int compat_drm_addbufs(struct file *file, unsigned int cmd,
                              unsigned long arg)
{
        drm_buf_desc32_t __user *argp = (void __user *)arg;
        struct drm_buf_desc __user *buf;
        int err;
        unsigned long agp_start;

        buf = compat_alloc_user_space(sizeof(*buf));
        if (!access_ok(VERIFY_WRITE, buf, sizeof(*buf))
            || !access_ok(VERIFY_WRITE, argp, sizeof(*argp)))
                return -EFAULT;

        if (__copy_in_user(buf, argp, offsetof(drm_buf_desc32_t, agp_start))
            || __get_user(agp_start, &argp->agp_start)
            || __put_user(agp_start, &buf->agp_start))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_ADD_BUFS, (unsigned long)buf);
        if (err)
                return err;

        if (__copy_in_user(argp, buf, offsetof(drm_buf_desc32_t, agp_start))
            || __get_user(agp_start, &buf->agp_start)
            || __put_user(agp_start, &argp->agp_start))
                return -EFAULT;

        return 0;
}

static int compat_drm_markbufs(struct file *file, unsigned int cmd,
                               unsigned long arg)
{
        drm_buf_desc32_t b32;
        drm_buf_desc32_t __user *argp = (void __user *)arg;
        struct drm_buf_desc __user *buf;

        if (copy_from_user(&b32, argp, sizeof(b32)))
                return -EFAULT;

        buf = compat_alloc_user_space(sizeof(*buf));
        if (!access_ok(VERIFY_WRITE, buf, sizeof(*buf)))
                return -EFAULT;

        if (__put_user(b32.size, &buf->size)
            || __put_user(b32.low_mark, &buf->low_mark)
            || __put_user(b32.high_mark, &buf->high_mark))
                return -EFAULT;

        return drm_ioctl(file->f_path.dentry->d_inode, file,
                         DRM_IOCTL_MARK_BUFS, (unsigned long)buf);
}

typedef struct drm_buf_info32 {
        int count;              /**< Entries in list */
        u32 list;
} drm_buf_info32_t;

static int compat_drm_infobufs(struct file *file, unsigned int cmd,
                               unsigned long arg)
{
        drm_buf_info32_t req32;
        drm_buf_info32_t __user *argp = (void __user *)arg;
        drm_buf_desc32_t __user *to;
        struct drm_buf_info __user *request;
        struct drm_buf_desc __user *list;
        size_t nbytes;
        int i, err;
        int count, actual;

        if (copy_from_user(&req32, argp, sizeof(req32)))
                return -EFAULT;

        count = req32.count;
        to = (drm_buf_desc32_t __user *) (unsigned long)req32.list;
        if (count < 0)
                count = 0;
        if (count > 0
            && !access_ok(VERIFY_WRITE, to, count * sizeof(drm_buf_desc32_t)))
                return -EFAULT;

        nbytes = sizeof(*request) + count * sizeof(struct drm_buf_desc);
        request = compat_alloc_user_space(nbytes);
        if (!access_ok(VERIFY_WRITE, request, nbytes))
                return -EFAULT;
        list = (struct drm_buf_desc *) (request + 1);

        if (__put_user(count, &request->count)
            || __put_user(list, &request->list))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_INFO_BUFS, (unsigned long)request);
        if (err)
                return err;

        if (__get_user(actual, &request->count))
                return -EFAULT;
        if (count >= actual)
                for (i = 0; i < actual; ++i)
                        if (__copy_in_user(&to[i], &list[i],
                                           offsetof(struct drm_buf_desc, flags)))
                                return -EFAULT;

        if (__put_user(actual, &argp->count))
                return -EFAULT;

        return 0;
}

typedef struct drm_buf_pub32 {
        int idx;                /**< Index into the master buffer list */
        int total;              /**< Buffer size */
        int used;               /**< Amount of buffer in use (for DMA) */
        u32 address;            /**< Address of buffer */
} drm_buf_pub32_t;

typedef struct drm_buf_map32 {
        int count;              /**< Length of the buffer list */
        u32 virtual;            /**< Mmap'd area in user-virtual */
        u32 list;               /**< Buffer information */
} drm_buf_map32_t;

static int compat_drm_mapbufs(struct file *file, unsigned int cmd,
                              unsigned long arg)
{
        drm_buf_map32_t __user *argp = (void __user *)arg;
        drm_buf_map32_t req32;
        drm_buf_pub32_t __user *list32;
        struct drm_buf_map __user *request;
        struct drm_buf_pub __user *list;
        int i, err;
        int count, actual;
        size_t nbytes;
        void __user *addr;

        if (copy_from_user(&req32, argp, sizeof(req32)))
                return -EFAULT;
        count = req32.count;
        list32 = (void __user *)(unsigned long)req32.list;

        if (count < 0)
                return -EINVAL;
        nbytes = sizeof(*request) + count * sizeof(struct drm_buf_pub);
        request = compat_alloc_user_space(nbytes);
        if (!access_ok(VERIFY_WRITE, request, nbytes))
                return -EFAULT;
        list = (struct drm_buf_pub *) (request + 1);

        if (__put_user(count, &request->count)
            || __put_user(list, &request->list))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_MAP_BUFS, (unsigned long)request);
        if (err)
                return err;

        if (__get_user(actual, &request->count))
                return -EFAULT;
        if (count >= actual)
                for (i = 0; i < actual; ++i)
                        if (__copy_in_user(&list32[i], &list[i],
                                           offsetof(struct drm_buf_pub, address))
                            || __get_user(addr, &list[i].address)
                            || __put_user((unsigned long)addr,
                                          &list32[i].address))
                                return -EFAULT;

        if (__put_user(actual, &argp->count)
            || __get_user(addr, &request->virtual)
            || __put_user((unsigned long)addr, &argp->virtual))
                return -EFAULT;

        return 0;
}

typedef struct drm_buf_free32 {
        int count;
        u32 list;
} drm_buf_free32_t;

static int compat_drm_freebufs(struct file *file, unsigned int cmd,
                               unsigned long arg)
{
        drm_buf_free32_t req32;
        struct drm_buf_free __user *request;
        drm_buf_free32_t __user *argp = (void __user *)arg;

        if (copy_from_user(&req32, argp, sizeof(req32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request)))
                return -EFAULT;
        if (__put_user(req32.count, &request->count)
            || __put_user((int __user *)(unsigned long)req32.list,
                          &request->list))
                return -EFAULT;

        return drm_ioctl(file->f_path.dentry->d_inode, file,
                         DRM_IOCTL_FREE_BUFS, (unsigned long)request);
}

typedef struct drm_ctx_priv_map32 {
        unsigned int ctx_id;     /**< Context requesting private mapping */
        u32 handle;             /**< Handle of map */
} drm_ctx_priv_map32_t;

static int compat_drm_setsareactx(struct file *file, unsigned int cmd,
                                  unsigned long arg)
{
        drm_ctx_priv_map32_t req32;
        struct drm_ctx_priv_map __user *request;
        drm_ctx_priv_map32_t __user *argp = (void __user *)arg;

        if (copy_from_user(&req32, argp, sizeof(req32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request)))
                return -EFAULT;
        if (__put_user(req32.ctx_id, &request->ctx_id)
            || __put_user((void *)(unsigned long)req32.handle,
                          &request->handle))
                return -EFAULT;

        return drm_ioctl(file->f_path.dentry->d_inode, file,
                         DRM_IOCTL_SET_SAREA_CTX, (unsigned long)request);
}

static int compat_drm_getsareactx(struct file *file, unsigned int cmd,
                                  unsigned long arg)
{
        struct drm_ctx_priv_map __user *request;
        drm_ctx_priv_map32_t __user *argp = (void __user *)arg;
        int err;
        unsigned int ctx_id;
        void *handle;

        if (!access_ok(VERIFY_WRITE, argp, sizeof(*argp))
            || __get_user(ctx_id, &argp->ctx_id))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request)))
                return -EFAULT;
        if (__put_user(ctx_id, &request->ctx_id))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_GET_SAREA_CTX, (unsigned long)request);
        if (err)
                return err;

        if (__get_user(handle, &request->handle)
            || __put_user((unsigned long)handle, &argp->handle))
                return -EFAULT;

        return 0;
}

typedef struct drm_ctx_res32 {
        int count;
        u32 contexts;
} drm_ctx_res32_t;

static int compat_drm_resctx(struct file *file, unsigned int cmd,
                             unsigned long arg)
{
        drm_ctx_res32_t __user *argp = (void __user *)arg;
        drm_ctx_res32_t res32;
        struct drm_ctx_res __user *res;
        int err;

        if (copy_from_user(&res32, argp, sizeof(res32)))
                return -EFAULT;

        res = compat_alloc_user_space(sizeof(*res));
        if (!access_ok(VERIFY_WRITE, res, sizeof(*res)))
                return -EFAULT;
        if (__put_user(res32.count, &res->count)
            || __put_user((struct drm_ctx __user *) (unsigned long)res32.contexts,
                          &res->contexts))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_RES_CTX, (unsigned long)res);
        if (err)
                return err;

        if (__get_user(res32.count, &res->count)
            || __put_user(res32.count, &argp->count))
                return -EFAULT;

        return 0;
}

typedef struct drm_dma32 {
        int context;              /**< Context handle */
        int send_count;           /**< Number of buffers to send */
        u32 send_indices;         /**< List of handles to buffers */
        u32 send_sizes;           /**< Lengths of data to send */
        enum drm_dma_flags flags;                 /**< Flags */
        int request_count;        /**< Number of buffers requested */
        int request_size;         /**< Desired size for buffers */
        u32 request_indices;      /**< Buffer information */
        u32 request_sizes;
        int granted_count;        /**< Number of buffers granted */
} drm_dma32_t;

static int compat_drm_dma(struct file *file, unsigned int cmd,
                          unsigned long arg)
{
        drm_dma32_t d32;
        drm_dma32_t __user *argp = (void __user *)arg;
        struct drm_dma __user *d;
        int err;

        if (copy_from_user(&d32, argp, sizeof(d32)))
                return -EFAULT;

        d = compat_alloc_user_space(sizeof(*d));
        if (!access_ok(VERIFY_WRITE, d, sizeof(*d)))
                return -EFAULT;

        if (__put_user(d32.context, &d->context)
            || __put_user(d32.send_count, &d->send_count)
            || __put_user((int __user *)(unsigned long)d32.send_indices,
                          &d->send_indices)
            || __put_user((int __user *)(unsigned long)d32.send_sizes,
                          &d->send_sizes)
            || __put_user(d32.flags, &d->flags)
            || __put_user(d32.request_count, &d->request_count)
            || __put_user((int __user *)(unsigned long)d32.request_indices,
                          &d->request_indices)
            || __put_user((int __user *)(unsigned long)d32.request_sizes,
                          &d->request_sizes))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_DMA, (unsigned long)d);
        if (err)
                return err;

        if (__get_user(d32.request_size, &d->request_size)
            || __get_user(d32.granted_count, &d->granted_count)
            || __put_user(d32.request_size, &argp->request_size)
            || __put_user(d32.granted_count, &argp->granted_count))
                return -EFAULT;

        return 0;
}

#if __OS_HAS_AGP
typedef struct drm_agp_mode32 {
        u32 mode;       /**< AGP mode */
} drm_agp_mode32_t;

static int compat_drm_agp_enable(struct file *file, unsigned int cmd,
                                 unsigned long arg)
{
        drm_agp_mode32_t __user *argp = (void __user *)arg;
        drm_agp_mode32_t m32;
        struct drm_agp_mode __user *mode;

        if (get_user(m32.mode, &argp->mode))
                return -EFAULT;

        mode = compat_alloc_user_space(sizeof(*mode));
        if (put_user(m32.mode, &mode->mode))
                return -EFAULT;

        return drm_ioctl(file->f_path.dentry->d_inode, file,
                         DRM_IOCTL_AGP_ENABLE, (unsigned long)mode);
}

typedef struct drm_agp_info32 {
        int agp_version_major;
        int agp_version_minor;
        u32 mode;
        u32 aperture_base;      /* physical address */
        u32 aperture_size;      /* bytes */
        u32 memory_allowed;     /* bytes */
        u32 memory_used;

        /* PCI information */
        unsigned short id_vendor;
        unsigned short id_device;
} drm_agp_info32_t;

static int compat_drm_agp_info(struct file *file, unsigned int cmd,
                               unsigned long arg)
{
        drm_agp_info32_t __user *argp = (void __user *)arg;
        drm_agp_info32_t i32;
        struct drm_agp_info __user *info;
        int err;

        info = compat_alloc_user_space(sizeof(*info));
        if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_AGP_INFO, (unsigned long)info);
        if (err)
                return err;

        if (__get_user(i32.agp_version_major, &info->agp_version_major)
            || __get_user(i32.agp_version_minor, &info->agp_version_minor)
            || __get_user(i32.mode, &info->mode)
            || __get_user(i32.aperture_base, &info->aperture_base)
            || __get_user(i32.aperture_size, &info->aperture_size)
            || __get_user(i32.memory_allowed, &info->memory_allowed)
            || __get_user(i32.memory_used, &info->memory_used)
            || __get_user(i32.id_vendor, &info->id_vendor)
            || __get_user(i32.id_device, &info->id_device))
                return -EFAULT;

        if (copy_to_user(argp, &i32, sizeof(i32)))
                return -EFAULT;

        return 0;
}

typedef struct drm_agp_buffer32 {
        u32 size;       /**< In bytes -- will round to page boundary */
        u32 handle;     /**< Used for binding / unbinding */
        u32 type;       /**< Type of memory to allocate */
        u32 physical;   /**< Physical used by i810 */
} drm_agp_buffer32_t;

static int compat_drm_agp_alloc(struct file *file, unsigned int cmd,
                                unsigned long arg)
{
        drm_agp_buffer32_t __user *argp = (void __user *)arg;
        drm_agp_buffer32_t req32;
        struct drm_agp_buffer __user *request;
        int err;

        if (copy_from_user(&req32, argp, sizeof(req32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || __put_user(req32.size, &request->size)
            || __put_user(req32.type, &request->type))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_AGP_ALLOC, (unsigned long)request);
        if (err)
                return err;

        if (__get_user(req32.handle, &request->handle)
            || __get_user(req32.physical, &request->physical)
            || copy_to_user(argp, &req32, sizeof(req32))) {
                drm_ioctl(file->f_path.dentry->d_inode, file,
                          DRM_IOCTL_AGP_FREE, (unsigned long)request);
                return -EFAULT;
        }

        return 0;
}

static int compat_drm_agp_free(struct file *file, unsigned int cmd,
                               unsigned long arg)
{
        drm_agp_buffer32_t __user *argp = (void __user *)arg;
        struct drm_agp_buffer __user *request;
        u32 handle;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || get_user(handle, &argp->handle)
            || __put_user(handle, &request->handle))
                return -EFAULT;

        return drm_ioctl(file->f_path.dentry->d_inode, file,
                         DRM_IOCTL_AGP_FREE, (unsigned long)request);
}

typedef struct drm_agp_binding32 {
        u32 handle;     /**< From drm_agp_buffer */
        u32 offset;     /**< In bytes -- will round to page boundary */
} drm_agp_binding32_t;

static int compat_drm_agp_bind(struct file *file, unsigned int cmd,
                               unsigned long arg)
{
        drm_agp_binding32_t __user *argp = (void __user *)arg;
        drm_agp_binding32_t req32;
        struct drm_agp_binding __user *request;

        if (copy_from_user(&req32, argp, sizeof(req32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || __put_user(req32.handle, &request->handle)
            || __put_user(req32.offset, &request->offset))
                return -EFAULT;

        return drm_ioctl(file->f_path.dentry->d_inode, file,
                         DRM_IOCTL_AGP_BIND, (unsigned long)request);
}

static int compat_drm_agp_unbind(struct file *file, unsigned int cmd,
                                 unsigned long arg)
{
        drm_agp_binding32_t __user *argp = (void __user *)arg;
        struct drm_agp_binding __user *request;
        u32 handle;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || get_user(handle, &argp->handle)
            || __put_user(handle, &request->handle))
                return -EFAULT;

        return drm_ioctl(file->f_path.dentry->d_inode, file,
                         DRM_IOCTL_AGP_UNBIND, (unsigned long)request);
}
#endif                          /* __OS_HAS_AGP */

typedef struct drm_scatter_gather32 {
        u32 size;       /**< In bytes -- will round to page boundary */
        u32 handle;     /**< Used for mapping / unmapping */
} drm_scatter_gather32_t;

static int compat_drm_sg_alloc(struct file *file, unsigned int cmd,
                               unsigned long arg)
{
        drm_scatter_gather32_t __user *argp = (void __user *)arg;
        struct drm_scatter_gather __user *request;
        int err;
        unsigned long x;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || !access_ok(VERIFY_WRITE, argp, sizeof(*argp))
            || __get_user(x, &argp->size)
            || __put_user(x, &request->size))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_SG_ALLOC, (unsigned long)request);
        if (err)
                return err;

        /* XXX not sure about the handle conversion here... */
        if (__get_user(x, &request->handle)
            || __put_user(x >> PAGE_SHIFT, &argp->handle))
                return -EFAULT;

        return 0;
}

static int compat_drm_sg_free(struct file *file, unsigned int cmd,
                              unsigned long arg)
{
        drm_scatter_gather32_t __user *argp = (void __user *)arg;
        struct drm_scatter_gather __user *request;
        unsigned long x;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || !access_ok(VERIFY_WRITE, argp, sizeof(*argp))
            || __get_user(x, &argp->handle)
            || __put_user(x << PAGE_SHIFT, &request->handle))
                return -EFAULT;

        return drm_ioctl(file->f_path.dentry->d_inode, file,
                         DRM_IOCTL_SG_FREE, (unsigned long)request);
}

typedef struct drm_update_draw32 {
        drm_drawable_t handle;
        unsigned int type;
        unsigned int num;
        /* 64-bit version has a 32-bit pad here */
        u64 data;       /**< Pointer */
} __attribute__((packed)) drm_update_draw32_t;

static int compat_drm_update_draw(struct file *file, unsigned int cmd,
                                  unsigned long arg)
{
        drm_update_draw32_t update32;
        struct drm_update_draw __user *request;
        int err;

        if (copy_from_user(&update32, (void __user *)arg, sizeof(update32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request)) ||
            __put_user(update32.handle, &request->handle) ||
            __put_user(update32.type, &request->type) ||
            __put_user(update32.num, &request->num) ||
            __put_user(update32.data, &request->data))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_UPDATE_DRAW, (unsigned long)request);
        return err;
}

struct drm_wait_vblank_request32 {
        enum drm_vblank_seq_type type;
        unsigned int sequence;
        u32 signal;
};

struct drm_wait_vblank_reply32 {
        enum drm_vblank_seq_type type;
        unsigned int sequence;
        s32 tval_sec;
        s32 tval_usec;
};

typedef union drm_wait_vblank32 {
        struct drm_wait_vblank_request32 request;
        struct drm_wait_vblank_reply32 reply;
} drm_wait_vblank32_t;

static int compat_drm_wait_vblank(struct file *file, unsigned int cmd,
                                  unsigned long arg)
{
        drm_wait_vblank32_t __user *argp = (void __user *)arg;
        drm_wait_vblank32_t req32;
        union drm_wait_vblank __user *request;
        int err;

        if (copy_from_user(&req32, argp, sizeof(req32)))
                return -EFAULT;

        request = compat_alloc_user_space(sizeof(*request));
        if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
            || __put_user(req32.request.type, &request->request.type)
            || __put_user(req32.request.sequence, &request->request.sequence)
            || __put_user(req32.request.signal, &request->request.signal))
                return -EFAULT;

        err = drm_ioctl(file->f_path.dentry->d_inode, file,
                        DRM_IOCTL_WAIT_VBLANK, (unsigned long)request);
        if (err)
                return err;

        if (__get_user(req32.reply.type, &request->reply.type)
            || __get_user(req32.reply.sequence, &request->reply.sequence)
            || __get_user(req32.reply.tval_sec, &request->reply.tval_sec)
            || __get_user(req32.reply.tval_usec, &request->reply.tval_usec))
                return -EFAULT;

        if (copy_to_user(argp, &req32, sizeof(req32)))
                return -EFAULT;

        return 0;
}

drm_ioctl_compat_t *drm_compat_ioctls[] = {
        [DRM_IOCTL_NR(DRM_IOCTL_VERSION32)] = compat_drm_version,
        [DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE32)] = compat_drm_getunique,
        [DRM_IOCTL_NR(DRM_IOCTL_GET_MAP32)] = compat_drm_getmap,
        [DRM_IOCTL_NR(DRM_IOCTL_GET_CLIENT32)] = compat_drm_getclient,
        [DRM_IOCTL_NR(DRM_IOCTL_GET_STATS32)] = compat_drm_getstats,
        [DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE32)] = compat_drm_setunique,
        [DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP32)] = compat_drm_addmap,
        [DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS32)] = compat_drm_addbufs,
        [DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS32)] = compat_drm_markbufs,
        [DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS32)] = compat_drm_infobufs,
        [DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS32)] = compat_drm_mapbufs,
        [DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS32)] = compat_drm_freebufs,
        [DRM_IOCTL_NR(DRM_IOCTL_RM_MAP32)] = compat_drm_rmmap,
        [DRM_IOCTL_NR(DRM_IOCTL_SET_SAREA_CTX32)] = compat_drm_setsareactx,
        [DRM_IOCTL_NR(DRM_IOCTL_GET_SAREA_CTX32)] = compat_drm_getsareactx,
        [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX32)] = compat_drm_resctx,
        [DRM_IOCTL_NR(DRM_IOCTL_DMA32)] = compat_drm_dma,
#if __OS_HAS_AGP
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE32)] = compat_drm_agp_enable,
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO32)] = compat_drm_agp_info,
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC32)] = compat_drm_agp_alloc,
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE32)] = compat_drm_agp_free,
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND32)] = compat_drm_agp_bind,
        [DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND32)] = compat_drm_agp_unbind,
#endif
        [DRM_IOCTL_NR(DRM_IOCTL_SG_ALLOC32)] = compat_drm_sg_alloc,
        [DRM_IOCTL_NR(DRM_IOCTL_SG_FREE32)] = compat_drm_sg_free,
        [DRM_IOCTL_NR(DRM_IOCTL_UPDATE_DRAW32)] = compat_drm_update_draw,
        [DRM_IOCTL_NR(DRM_IOCTL_WAIT_VBLANK32)] = compat_drm_wait_vblank,
};

/**
 * Called whenever a 32-bit process running under a 64-bit kernel
 * performs an ioctl on /dev/drm.
 *
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or negative number on failure.
 */
long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
        unsigned int nr = DRM_IOCTL_NR(cmd);
        drm_ioctl_compat_t *fn;
        int ret;

        /* Assume that ioctls without an explicit compat routine will just
         * work.  This may not always be a good assumption, but it's better
         * than always failing.
         */
        if (nr >= ARRAY_SIZE(drm_compat_ioctls))
                return drm_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);

        fn = drm_compat_ioctls[nr];

        lock_kernel();          /* XXX for now */
        if (fn != NULL)
                ret = (*fn) (filp, cmd, arg);
        else
                ret = drm_ioctl(filp->f_path.dentry->d_inode, filp, cmd, arg);
        unlock_kernel();

        return ret;
}

EXPORT_SYMBOL(drm_compat_ioctl);