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i915_ioc32.c

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/**
 * \file i915_ioc32.c
 *
 * 32-bit ioctl compatibility routines for the i915 DRM.
 *
 * \author Alan Hourihane <alanh@fairlite.demon.co.uk>
 *
 *
 * Copyright (C) Paul Mackerras 2005
 * Copyright (C) Alan Hourihane 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 "i915_drm.h"

typedef struct _drm_i915_batchbuffer32 {
      int start;        /* agp offset */
      int used;         /* nr bytes in use */
      int DR1;          /* hw flags for GFX_OP_DRAWRECT_INFO */
      int DR4;          /* window origin for GFX_OP_DRAWRECT_INFO */
      int num_cliprects;      /* mulitpass with multiple cliprects? */
      u32 cliprects;          /* pointer to userspace cliprects */
} drm_i915_batchbuffer32_t;

static int compat_i915_batchbuffer(struct file *file, unsigned int cmd,
                           unsigned long arg)
{
      drm_i915_batchbuffer32_t batchbuffer32;
      drm_i915_batchbuffer_t __user *batchbuffer;

      if (copy_from_user
          (&batchbuffer32, (void __user *)arg, sizeof(batchbuffer32)))
            return -EFAULT;

      batchbuffer = compat_alloc_user_space(sizeof(*batchbuffer));
      if (!access_ok(VERIFY_WRITE, batchbuffer, sizeof(*batchbuffer))
          || __put_user(batchbuffer32.start, &batchbuffer->start)
          || __put_user(batchbuffer32.used, &batchbuffer->used)
          || __put_user(batchbuffer32.DR1, &batchbuffer->DR1)
          || __put_user(batchbuffer32.DR4, &batchbuffer->DR4)
          || __put_user(batchbuffer32.num_cliprects,
                    &batchbuffer->num_cliprects)
          || __put_user((int __user *)(unsigned long)batchbuffer32.cliprects,
                    &batchbuffer->cliprects))
            return -EFAULT;

      return drm_ioctl(file->f_path.dentry->d_inode, file,
                   DRM_IOCTL_I915_BATCHBUFFER,
                   (unsigned long)batchbuffer);
}

typedef struct _drm_i915_cmdbuffer32 {
      u32 buf;          /* pointer to userspace command buffer */
      int sz;                 /* nr bytes in buf */
      int DR1;          /* hw flags for GFX_OP_DRAWRECT_INFO */
      int DR4;          /* window origin for GFX_OP_DRAWRECT_INFO */
      int num_cliprects;      /* mulitpass with multiple cliprects? */
      u32 cliprects;          /* pointer to userspace cliprects */
} drm_i915_cmdbuffer32_t;

static int compat_i915_cmdbuffer(struct file *file, unsigned int cmd,
                         unsigned long arg)
{
      drm_i915_cmdbuffer32_t cmdbuffer32;
      drm_i915_cmdbuffer_t __user *cmdbuffer;

      if (copy_from_user
          (&cmdbuffer32, (void __user *)arg, sizeof(cmdbuffer32)))
            return -EFAULT;

      cmdbuffer = compat_alloc_user_space(sizeof(*cmdbuffer));
      if (!access_ok(VERIFY_WRITE, cmdbuffer, sizeof(*cmdbuffer))
          || __put_user((int __user *)(unsigned long)cmdbuffer32.buf,
                    &cmdbuffer->buf)
          || __put_user(cmdbuffer32.sz, &cmdbuffer->sz)
          || __put_user(cmdbuffer32.DR1, &cmdbuffer->DR1)
          || __put_user(cmdbuffer32.DR4, &cmdbuffer->DR4)
          || __put_user(cmdbuffer32.num_cliprects, &cmdbuffer->num_cliprects)
          || __put_user((int __user *)(unsigned long)cmdbuffer32.cliprects,
                    &cmdbuffer->cliprects))
            return -EFAULT;

      return drm_ioctl(file->f_path.dentry->d_inode, file,
                   DRM_IOCTL_I915_CMDBUFFER, (unsigned long)cmdbuffer);
}

typedef struct drm_i915_irq_emit32 {
      u32 irq_seq;
} drm_i915_irq_emit32_t;

static int compat_i915_irq_emit(struct file *file, unsigned int cmd,
                        unsigned long arg)
{
      drm_i915_irq_emit32_t req32;
      drm_i915_irq_emit_t __user *request;

      if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
            return -EFAULT;

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

      return drm_ioctl(file->f_path.dentry->d_inode, file,
                   DRM_IOCTL_I915_IRQ_EMIT, (unsigned long)request);
}
typedef struct drm_i915_getparam32 {
      int param;
      u32 value;
} drm_i915_getparam32_t;

static int compat_i915_getparam(struct file *file, unsigned int cmd,
                        unsigned long arg)
{
      drm_i915_getparam32_t req32;
      drm_i915_getparam_t __user *request;

      if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
            return -EFAULT;

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

      return drm_ioctl(file->f_path.dentry->d_inode, file,
                   DRM_IOCTL_I915_GETPARAM, (unsigned long)request);
}

typedef struct drm_i915_mem_alloc32 {
      int region;
      int alignment;
      int size;
      u32 region_offset;      /* offset from start of fb or agp */
} drm_i915_mem_alloc32_t;

static int compat_i915_alloc(struct file *file, unsigned int cmd,
                       unsigned long arg)
{
      drm_i915_mem_alloc32_t req32;
      drm_i915_mem_alloc_t __user *request;

      if (copy_from_user(&req32, (void __user *)arg, sizeof(req32)))
            return -EFAULT;

      request = compat_alloc_user_space(sizeof(*request));
      if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
          || __put_user(req32.region, &request->region)
          || __put_user(req32.alignment, &request->alignment)
          || __put_user(req32.size, &request->size)
          || __put_user((void __user *)(unsigned long)req32.region_offset,
                    &request->region_offset))
            return -EFAULT;

      return drm_ioctl(file->f_path.dentry->d_inode, file,
                   DRM_IOCTL_I915_ALLOC, (unsigned long)request);
}

drm_ioctl_compat_t *i915_compat_ioctls[] = {
      [DRM_I915_BATCHBUFFER] = compat_i915_batchbuffer,
      [DRM_I915_CMDBUFFER] = compat_i915_cmdbuffer,
      [DRM_I915_GETPARAM] = compat_i915_getparam,
      [DRM_I915_IRQ_EMIT] = compat_i915_irq_emit,
      [DRM_I915_ALLOC] = compat_i915_alloc
};

/**
 * 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.
 */
00202 long i915_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(i915_compat_ioctls))
            fn = i915_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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