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}