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	int chipset;
 42	int sgram;
 43	unsigned int maccess;
 44	unsigned int fb_cpp;
 45	unsigned int front_offset, front_pitch;
 46	unsigned int back_offset, back_pitch;
 47	unsigned int depth_cpp;
 48	unsigned int depth_offset, depth_pitch;
 49	unsigned int texture_offset[MGA_NR_TEX_HEAPS];
 50	unsigned int texture_size[MGA_NR_TEX_HEAPS];
 51	u32 fb_offset;
 52	u32 mmio_offset;
 53	u32 status_offset;
 54	u32 warp_offset;
 55	u32 primary_offset;
 56	u32 buffers_offset;
 57} drm_mga_init32_t;
 58
 59static int compat_mga_init(struct file *file, unsigned int cmd,
 60			   unsigned long arg)
 61{
 62	drm_mga_init32_t init32;
 63	drm_mga_init_t init;
 64
 65	if (copy_from_user(&init32, (void __user *)arg, sizeof(init32)))
 66		return -EFAULT;
 67
 68	init.func = init32.func;
 69	init.sarea_priv_offset = init32.sarea_priv_offset;
 70	memcpy(&init.chipset, &init32.chipset,
 71		offsetof(drm_mga_init_t, fb_offset) -
 72		offsetof(drm_mga_init_t, chipset));
 73	init.fb_offset = init32.fb_offset;
 74	init.mmio_offset = init32.mmio_offset;
 75	init.status_offset = init32.status_offset;
 76	init.warp_offset = init32.warp_offset;
 77	init.primary_offset = init32.primary_offset;
 78	init.buffers_offset = init32.buffers_offset;
 79
 80	return drm_ioctl_kernel(file, mga_dma_init, &init,
 81				DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
 82}
 83
 84typedef struct drm_mga_getparam32 {
 85	int param;
 86	u32 value;
 87} drm_mga_getparam32_t;
 88
 89static int compat_mga_getparam(struct file *file, unsigned int cmd,
 90			       unsigned long arg)
 91{
 92	drm_mga_getparam32_t getparam32;
 93	drm_mga_getparam_t getparam;
 94
 95	if (copy_from_user(&getparam32, (void __user *)arg, sizeof(getparam32)))
 96		return -EFAULT;
 97
 98	getparam.param = getparam32.param;
 99	getparam.value = compat_ptr(getparam32.value);
100	return drm_ioctl_kernel(file, mga_getparam, &getparam, DRM_AUTH);
101}
102
103typedef struct drm_mga_drm_bootstrap32 {
104	u32 texture_handle;
105	u32 texture_size;
106	u32 primary_size;
107	u32 secondary_bin_count;
108	u32 secondary_bin_size;
109	u32 agp_mode;
110	u8 agp_size;
111} drm_mga_dma_bootstrap32_t;
112
113static int compat_mga_dma_bootstrap(struct file *file, unsigned int cmd,
114				    unsigned long arg)
115{
116	drm_mga_dma_bootstrap32_t dma_bootstrap32;
117	drm_mga_dma_bootstrap_t dma_bootstrap;
118	int err;
119
120	if (copy_from_user(&dma_bootstrap32, (void __user *)arg,
121			   sizeof(dma_bootstrap32)))
122		return -EFAULT;
123
124	dma_bootstrap.texture_handle = dma_bootstrap32.texture_handle;
125	dma_bootstrap.texture_size = dma_bootstrap32.texture_size;
126	dma_bootstrap.primary_size = dma_bootstrap32.primary_size;
127	dma_bootstrap.secondary_bin_count = dma_bootstrap32.secondary_bin_count;
128	dma_bootstrap.secondary_bin_size = dma_bootstrap32.secondary_bin_size;
129	dma_bootstrap.agp_mode = dma_bootstrap32.agp_mode;
130	dma_bootstrap.agp_size = dma_bootstrap32.agp_size;
131
132	err = drm_ioctl_kernel(file, mga_dma_bootstrap, &dma_bootstrap,
133				DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY);
134	if (err)
135		return err;
136
137	dma_bootstrap32.texture_handle = dma_bootstrap.texture_handle;
138	dma_bootstrap32.texture_size = dma_bootstrap.texture_size;
139	dma_bootstrap32.primary_size = dma_bootstrap.primary_size;
140	dma_bootstrap32.secondary_bin_count = dma_bootstrap.secondary_bin_count;
141	dma_bootstrap32.secondary_bin_size = dma_bootstrap.secondary_bin_size;
142	dma_bootstrap32.agp_mode = dma_bootstrap.agp_mode;
143	dma_bootstrap32.agp_size = dma_bootstrap.agp_size;
144	if (copy_to_user((void __user *)arg, &dma_bootstrap32,
145			 sizeof(dma_bootstrap32)))
146		return -EFAULT;
147
148	return 0;
149}
150
151static struct {
152	drm_ioctl_compat_t *fn;
153	char *name;
154} mga_compat_ioctls[] = {
155#define DRM_IOCTL32_DEF(n, f)[DRM_##n] = {.fn = f, .name = #n}
156	DRM_IOCTL32_DEF(MGA_INIT, compat_mga_init),
157	DRM_IOCTL32_DEF(MGA_GETPARAM, compat_mga_getparam),
158	DRM_IOCTL32_DEF(MGA_DMA_BOOTSTRAP, compat_mga_dma_bootstrap),
159};
160
161/**
162 * Called whenever a 32-bit process running under a 64-bit kernel
163 * performs an ioctl on /dev/dri/card<n>.
164 *
165 * \param filp file pointer.
166 * \param cmd command.
167 * \param arg user argument.
168 * \return zero on success or negative number on failure.
169 */
170long mga_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
171{
172	unsigned int nr = DRM_IOCTL_NR(cmd);
173	struct drm_file *file_priv = filp->private_data;
174	drm_ioctl_compat_t *fn = NULL;
175	int ret;
176
177	if (nr < DRM_COMMAND_BASE)
178		return drm_compat_ioctl(filp, cmd, arg);
179
180	if (nr >= DRM_COMMAND_BASE + ARRAY_SIZE(mga_compat_ioctls))
181		return drm_ioctl(filp, cmd, arg);
182
183	fn = mga_compat_ioctls[nr - DRM_COMMAND_BASE].fn;
184	if (!fn)
185		return drm_ioctl(filp, cmd, arg);
186
187	DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
188		  task_pid_nr(current),
189		  (long)old_encode_dev(file_priv->minor->kdev->devt),
190		  file_priv->authenticated,
191		  mga_compat_ioctls[nr - DRM_COMMAND_BASE].name);
192	ret = (*fn) (filp, cmd, arg);
193	if (ret)
194		DRM_DEBUG("ret = %d\n", ret);
195	return ret;
196}