cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mga_ioc32.c (6237B)

      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
     34#include <linux/compat.h>
     35
     36#include "mga_drv.h"
     37
     38typedef struct drm32_mga_init {
     39	int func;
     40	u32 sarea_priv_offset;
     41	struct_group(always32bit,
     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	);
     53	u32 fb_offset;
     54	u32 mmio_offset;
     55	u32 status_offset;
     56	u32 warp_offset;
     57	u32 primary_offset;
     58	u32 buffers_offset;
     59} drm_mga_init32_t;
     60
     61static int compat_mga_init(struct file *file, unsigned int cmd,
     62			   unsigned long arg)
     63{
     64	drm_mga_init32_t init32;
     65	drm_mga_init_t init;
     66
     67	if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
     68		return -EFAULT;
     69
     70	init.func = init32.func;
     71	init.sarea_priv_offset = init32.sarea_priv_offset;
     72	memcpy(&init.always32bit, &init32.always32bit,
     73	       sizeof(init32.always32bit));
     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 * mga_compat_ioctl - Called whenever a 32-bit process running under
    164 *                    a 64-bit kernel performs an ioctl on /dev/dri/card<n>.
    165 *
    166 * @filp: file pointer.
    167 * @cmd:  command.
    168 * @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}