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r128_ioc32.c

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/**
 * \file r128_ioc32.c
 *
 * 32-bit ioctl compatibility routines for the R128 DRM.
 *
 * \author Dave Airlie <airlied@linux.ie> with code from patches by Egbert Eich
 *
 * Copyright (C) Paul Mackerras 2005
 * Copyright (C) Egbert Eich 2003,2004
 * Copyright (C) Dave Airlie 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.h"
#include "r128_drm.h"

typedef struct drm_r128_init32 {
      int func;
      unsigned int sarea_priv_offset;
      int is_pci;
      int cce_mode;
      int cce_secure;
      int ring_size;
      int usec_timeout;

      unsigned int fb_bpp;
      unsigned int front_offset, front_pitch;
      unsigned int back_offset, back_pitch;
      unsigned int depth_bpp;
      unsigned int depth_offset, depth_pitch;
      unsigned int span_offset;

      unsigned int fb_offset;
      unsigned int mmio_offset;
      unsigned int ring_offset;
      unsigned int ring_rptr_offset;
      unsigned int buffers_offset;
      unsigned int agp_textures_offset;
} drm_r128_init32_t;

static int compat_r128_init(struct file *file, unsigned int cmd,
                      unsigned long arg)
{
      drm_r128_init32_t init32;
      drm_r128_init_t __user *init;

      if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
            return -EFAULT;

      init = compat_alloc_user_space(sizeof(*init));
      if (!access_ok(VERIFY_WRITE, init, sizeof(*init))
          || __put_user(init32.func, &init->func)
          || __put_user(init32.sarea_priv_offset, &init->sarea_priv_offset)
          || __put_user(init32.is_pci, &init->is_pci)
          || __put_user(init32.cce_mode, &init->cce_mode)
          || __put_user(init32.cce_secure, &init->cce_secure)
          || __put_user(init32.ring_size, &init->ring_size)
          || __put_user(init32.usec_timeout, &init->usec_timeout)
          || __put_user(init32.fb_bpp, &init->fb_bpp)
          || __put_user(init32.front_offset, &init->front_offset)
          || __put_user(init32.front_pitch, &init->front_pitch)
          || __put_user(init32.back_offset, &init->back_offset)
          || __put_user(init32.back_pitch, &init->back_pitch)
          || __put_user(init32.depth_bpp, &init->depth_bpp)
          || __put_user(init32.depth_offset, &init->depth_offset)
          || __put_user(init32.depth_pitch, &init->depth_pitch)
          || __put_user(init32.span_offset, &init->span_offset)
          || __put_user(init32.fb_offset, &init->fb_offset)
          || __put_user(init32.mmio_offset, &init->mmio_offset)
          || __put_user(init32.ring_offset, &init->ring_offset)
          || __put_user(init32.ring_rptr_offset, &init->ring_rptr_offset)
          || __put_user(init32.buffers_offset, &init->buffers_offset)
          || __put_user(init32.agp_textures_offset,
                    &init->agp_textures_offset))
            return -EFAULT;

      return drm_ioctl(file->f_path.dentry->d_inode, file,
                   DRM_IOCTL_R128_INIT, (unsigned long)init);
}

typedef struct drm_r128_depth32 {
      int func;
      int n;
      u32 x;
      u32 y;
      u32 buffer;
      u32 mask;
} drm_r128_depth32_t;

static int compat_r128_depth(struct file *file, unsigned int cmd,
                       unsigned long arg)
{
      drm_r128_depth32_t depth32;
      drm_r128_depth_t __user *depth;

      if (copy_from_user(&depth32, (void __user *)arg, sizeof(depth32)))
            return -EFAULT;

      depth = compat_alloc_user_space(sizeof(*depth));
      if (!access_ok(VERIFY_WRITE, depth, sizeof(*depth))
          || __put_user(depth32.func, &depth->func)
          || __put_user(depth32.n, &depth->n)
          || __put_user((int __user *)(unsigned long)depth32.x, &depth->x)
          || __put_user((int __user *)(unsigned long)depth32.y, &depth->y)
          || __put_user((unsigned int __user *)(unsigned long)depth32.buffer,
                    &depth->buffer)
          || __put_user((unsigned char __user *)(unsigned long)depth32.mask,
                    &depth->mask))
            return -EFAULT;

      return drm_ioctl(file->f_path.dentry->d_inode, file,
                   DRM_IOCTL_R128_DEPTH, (unsigned long)depth);

}

typedef struct drm_r128_stipple32 {
      u32 mask;
} drm_r128_stipple32_t;

static int compat_r128_stipple(struct file *file, unsigned int cmd,
                         unsigned long arg)
{
      drm_r128_stipple32_t stipple32;
      drm_r128_stipple_t __user *stipple;

      if (copy_from_user(&stipple32, (void __user *)arg, sizeof(stipple32)))
            return -EFAULT;

      stipple = compat_alloc_user_space(sizeof(*stipple));
      if (!access_ok(VERIFY_WRITE, stipple, sizeof(*stipple))
          || __put_user((unsigned int __user *)(unsigned long)stipple32.mask,
                    &stipple->mask))
            return -EFAULT;

      return drm_ioctl(file->f_path.dentry->d_inode, file,
                   DRM_IOCTL_R128_STIPPLE, (unsigned long)stipple);
}

typedef struct drm_r128_getparam32 {
      int param;
      u32 value;
} drm_r128_getparam32_t;

static int compat_r128_getparam(struct file *file, unsigned int cmd,
                        unsigned long arg)
{
      drm_r128_getparam32_t getparam32;
      drm_r128_getparam_t __user *getparam;

      if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
            return -EFAULT;

      getparam = compat_alloc_user_space(sizeof(*getparam));
      if (!access_ok(VERIFY_WRITE, getparam, sizeof(*getparam))
          || __put_user(getparam32.param, &getparam->param)
          || __put_user((void __user *)(unsigned long)getparam32.value,
                    &getparam->value))
            return -EFAULT;

      return drm_ioctl(file->f_path.dentry->d_inode, file,
                   DRM_IOCTL_R128_GETPARAM, (unsigned long)getparam);
}

drm_ioctl_compat_t *r128_compat_ioctls[] = {
      [DRM_R128_INIT] = compat_r128_init,
      [DRM_R128_DEPTH] = compat_r128_depth,
      [DRM_R128_STIPPLE] = compat_r128_stipple,
      [DRM_R128_GETPARAM] = compat_r128_getparam,
};

/**
 * Called whenever a 32-bit process running under a 64-bit kernel
 * performs an ioctl on /dev/dri/card<n>.
 *
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or negative number on failure.
 */
00201 long r128_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
      unsigned int nr = DRM_IOCTL_NR(cmd);
      drm_ioctl_compat_t *fn = NULL;
      int ret;

      if (nr < DRM_COMMAND_BASE)
            return drm_compat_ioctl(filp, cmd, arg);

      if (nr < DRM_COMMAND_BASE + DRM_ARRAY_SIZE(r128_compat_ioctls))
            fn = r128_compat_ioctls[nr - DRM_COMMAND_BASE];

      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;
}

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