LXR linux/drivers/gpu/drm/mga/mga

   1/**
   2 * \file mga_ioc32.c
   3 *
   4 * 32-bit ioctl compatibility routines for the MGA DRM.
   5 *
   6 * \author Dave Airlie <airlied@linux.ie> with code from patches by Egbert Eich
   7 *
   8 *
   9 * Copyright (C) Paul Mackerras 2005
  10 * Copyright (C) Egbert Eich 2003,2004
  11 * Copyright (C) Dave Airlie 2005
  12 * All Rights Reserved.
  13 *
  14 * Permission is hereby granted, free of charge, to any person obtaining a
  15 * copy of this software and associated documentation files (the "Software"),
  16 * to deal in the Software without restriction, including without limitation
  17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  18 * and/or sell copies of the Software, and to permit persons to whom the
  19 * Software is furnished to do so, subject to the following conditions:
  20 *
  21 * The above copyright notice and this permission notice (including the next
  22 * paragraph) shall be included in all copies or substantial portions of the
  23 * Software.
  24 *
  25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  28 * THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  29 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  30 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  31 * IN THE SOFTWARE.
  32 */
  33#include <linux/compat.h>
  34
  35#include <drm/drmP.h>
  36#include <drm/mga_drm.h>
  37#include "mga_drv.h"
  38
  39typedef struct drm32_mga_init {
  40        int func;
  41        u32 sarea_priv_offset;
  42        int chipset;
  43        int sgram;
  44        unsigned int maccess;
  45        unsigned int fb_cpp;
  46        unsigned int front_offset, front_pitch;
  47        unsigned int back_offset, back_pitch;
  48        unsigned int depth_cpp;
  49        unsigned int depth_offset, depth_pitch;
  50        unsigned int texture_offset[MGA_NR_TEX_HEAPS];
  51        unsigned int texture_size[MGA_NR_TEX_HEAPS];
  52        u32 fb_offset;
  53        u32 mmio_offset;
  54        u32 status_offset;
  55        u32 warp_offset;
  56        u32 primary_offset;
  57        u32 buffers_offset;
  58} drm_mga_init32_t;
  59
  60static int compat_mga_init(struct file *file, unsigned int cmd,
  61                           unsigned long arg)
  62{
  63        drm_mga_init32_t init32;
  64        drm_mga_init_t init;
  65
  66        if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
  67                return -EFAULT;
  68
  69        init.func = init32.func;
  70        init.sarea_priv_offset = init32.sarea_priv_offset;
  71        memcpy(&init.chipset, &init32.chipset,
  72                offsetof(drm_mga_init_t, fb_offset) -
  73                offsetof(drm_mga_init_t, chipset));
  74        init.fb_offset = init32.fb_offset;
  75        init.mmio_offset = init32.mmio_offset;
  76        init.status_offset = init32.status_offset;
  77        init.warp_offset = init32.warp_offset;
  78        init.primary_offset = init32.primary_offset;
  79        init.buffers_offset = init32.buffers_offset;
  80
  81        return drm_ioctl_kernel(file, mga_dma_init, &init,
  82                                DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
  83}
  84
  85typedef struct drm_mga_getparam32 {
  86        int param;
  87        u32 value;
  88} drm_mga_getparam32_t;
  89
  90static int compat_mga_getparam(struct file *file, unsigned int cmd,
  91                               unsigned long arg)
  92{
  93        drm_mga_getparam32_t getparam32;
  94        drm_mga_getparam_t getparam;
  95
  96        if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
  97                return -EFAULT;
  98
  99        getparam.param = getparam32.param;
 100        getparam.value = compat_ptr(getparam32.value);
 101        return drm_ioctl_kernel(file, mga_getparam, &getparam, DRM_AUTH);
 102}
 103
 104typedef struct drm_mga_drm_bootstrap32 {
 105        u32 texture_handle;
 106        u32 texture_size;
 107        u32 primary_size;
 108        u32 secondary_bin_count;
 109        u32 secondary_bin_size;
 110        u32 agp_mode;
 111        u8 agp_size;
 112} drm_mga_dma_bootstrap32_t;
 113
 114static int compat_mga_dma_bootstrap(struct file *file, unsigned int cmd,
 115                                    unsigned long arg)
 116{
 117        drm_mga_dma_bootstrap32_t dma_bootstrap32;
 118        drm_mga_dma_bootstrap_t dma_bootstrap;
 119        int err;
 120
 121        if (copy_from_user(&dma_bootstrap32, (void __user *)arg,
 122                           sizeof(dma_bootstrap32)))
 123                return -EFAULT;
 124
 125        dma_bootstrap.texture_handle = dma_bootstrap32.texture_handle;
 126        dma_bootstrap.texture_size = dma_bootstrap32.texture_size;
 127        dma_bootstrap.primary_size = dma_bootstrap32.primary_size;
 128        dma_bootstrap.secondary_bin_count = dma_bootstrap32.secondary_bin_count;
 129        dma_bootstrap.secondary_bin_size = dma_bootstrap32.secondary_bin_size;
 130        dma_bootstrap.agp_mode = dma_bootstrap32.agp_mode;
 131        dma_bootstrap.agp_size = dma_bootstrap32.agp_size;
 132
 133        err = drm_ioctl_kernel(file, mga_dma_bootstrap, &dma_bootstrap,
 134                                DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 135        if (err)
 136                return err;
 137
 138        dma_bootstrap32.texture_handle = dma_bootstrap.texture_handle;
 139        dma_bootstrap32.texture_size = dma_bootstrap.texture_size;
 140        dma_bootstrap32.primary_size = dma_bootstrap.primary_size;
 141        dma_bootstrap32.secondary_bin_count = dma_bootstrap.secondary_bin_count;
 142        dma_bootstrap32.secondary_bin_size = dma_bootstrap.secondary_bin_size;
 143        dma_bootstrap32.agp_mode = dma_bootstrap.agp_mode;
 144        dma_bootstrap32.agp_size = dma_bootstrap.agp_size;
 145        if (copy_to_user((void __user *)arg, &dma_bootstrap32,
 146                         sizeof(dma_bootstrap32)))
 147                return -EFAULT;
 148
 149        return 0;
 150}
 151
 152static struct {
 153        drm_ioctl_compat_t *fn;
 154        char *name;
 155} mga_compat_ioctls[] = {
 156#define DRM_IOCTL32_DEF(n, f)[DRM_##n] = {.fn = f, .name = #n}
 157        DRM_IOCTL32_DEF(MGA_INIT, compat_mga_init),
 158        DRM_IOCTL32_DEF(MGA_GETPARAM, compat_mga_getparam),
 159        DRM_IOCTL32_DEF(MGA_DMA_BOOTSTRAP, compat_mga_dma_bootstrap),
 160};
 161
 162/**
 163 * Called whenever a 32-bit process running under a 64-bit kernel
 164 * performs an ioctl on /dev/dri/card<n>.
 165 *
 166 * \param filp file pointer.
 167 * \param cmd command.
 168 * \param arg user argument.
 169 * \return zero on success or negative number on failure.
 170 */
 171long mga_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 172{
 173        unsigned int nr = DRM_IOCTL_NR(cmd);
 174        struct drm_file *file_priv = filp->private_data;
 175        drm_ioctl_compat_t *fn = NULL;
 176        int ret;
 177
 178        if (nr < DRM_COMMAND_BASE)
 179                return drm_compat_ioctl(filp, cmd, arg);
 180
 181        if (nr >= DRM_COMMAND_BASE + ARRAY_SIZE(mga_compat_ioctls))
 182                return drm_ioctl(filp, cmd, arg);
 183
 184        fn = mga_compat_ioctls[nr - DRM_COMMAND_BASE].fn;
 185        if (!fn)
 186                return drm_ioctl(filp, cmd, arg);
 187
 188        DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
 189                  task_pid_nr(current),
 190                  (long)old_encode_dev(file_priv->minor->kdev->devt),
 191                  file_priv->authenticated,
 192                  mga_compat_ioctls[nr - DRM_COMMAND_BASE].name);
 193        ret = (*fn) (filp, cmd, arg);
 194        if (ret)
 195                DRM_DEBUG("ret = %d\n", ret);
 196        return ret;
 197}
 198