/*
* \file drm_ioc32.c
*
* 32-bit ioctl compatibility routines for the DRM.
*
* \author Paul Mackerras <[email protected]>
*
* Copyright (C) Paul Mackerras 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 <linux/ratelimit.h>
#include <linux/export.h>
#include <drm/drm_device.h>
#include <drm/drm_file.h>
#include <drm/drm_print.h>
#include "drm_crtc_internal.h"
#include "drm_internal.h"
#define DRM_IOCTL_VERSION32 DRM_IOWR(0x00, drm_version32_t)
#define DRM_IOCTL_GET_UNIQUE32 DRM_IOWR(0x01, drm_unique32_t)
#define DRM_IOCTL_GET_MAP32 DRM_IOWR(0x04, drm_map32_t)
#define DRM_IOCTL_GET_CLIENT32 DRM_IOWR(0x05, drm_client32_t)
#define DRM_IOCTL_GET_STATS32 DRM_IOR( 0x06, drm_stats32_t)
#define DRM_IOCTL_SET_UNIQUE32 DRM_IOW( 0x10, drm_unique32_t)
#define DRM_IOCTL_ADD_MAP32 DRM_IOWR(0x15, drm_map32_t)
#define DRM_IOCTL_ADD_BUFS32 DRM_IOWR(0x16, drm_buf_desc32_t)
#define DRM_IOCTL_MARK_BUFS32 DRM_IOW( 0x17, drm_buf_desc32_t)
#define DRM_IOCTL_INFO_BUFS32 DRM_IOWR(0x18, drm_buf_info32_t)
#define DRM_IOCTL_MAP_BUFS32 DRM_IOWR(0x19, drm_buf_map32_t)
#define DRM_IOCTL_FREE_BUFS32 DRM_IOW( 0x1a, drm_buf_free32_t)
#define DRM_IOCTL_RM_MAP32 DRM_IOW( 0x1b, drm_map32_t)
#define DRM_IOCTL_SET_SAREA_CTX32 DRM_IOW( 0x1c, drm_ctx_priv_map32_t)
#define DRM_IOCTL_GET_SAREA_CTX32 DRM_IOWR(0x1d, drm_ctx_priv_map32_t)
#define DRM_IOCTL_RES_CTX32 DRM_IOWR(0x26, drm_ctx_res32_t)
#define DRM_IOCTL_DMA32 DRM_IOWR(0x29, drm_dma32_t)
#define DRM_IOCTL_AGP_ENABLE32 DRM_IOW( 0x32, drm_agp_mode32_t)
#define DRM_IOCTL_AGP_INFO32 DRM_IOR( 0x33, drm_agp_info32_t)
#define DRM_IOCTL_AGP_ALLOC32 DRM_IOWR(0x34, drm_agp_buffer32_t)
#define DRM_IOCTL_AGP_FREE32 DRM_IOW( 0x35, drm_agp_buffer32_t)
#define DRM_IOCTL_AGP_BIND32 DRM_IOW( 0x36, drm_agp_binding32_t)
#define DRM_IOCTL_AGP_UNBIND32 DRM_IOW( 0x37, drm_agp_binding32_t)
#define DRM_IOCTL_SG_ALLOC32 DRM_IOW( 0x38, drm_scatter_gather32_t)
#define DRM_IOCTL_SG_FREE32 DRM_IOW( 0x39, drm_scatter_gather32_t)
#define DRM_IOCTL_UPDATE_DRAW32 DRM_IOW( 0x3f, drm_update_draw32_t)
#define DRM_IOCTL_WAIT_VBLANK32 DRM_IOWR(0x3a, drm_wait_vblank32_t)
#define DRM_IOCTL_MODE_ADDFB232 DRM_IOWR(0xb8, drm_mode_fb_cmd232_t)
typedef struct drm_version_32 {
int version_major; /* Major version */
int version_minor; /* Minor version */
int version_patchlevel; /* Patch level */
u32 name_len; /* Length of name buffer */
u32 name; /* Name of driver */
u32 date_len; /* Length of date buffer */
u32 date; /* User-space buffer to hold date */
u32 desc_len; /* Length of desc buffer */
u32 desc; /* User-space buffer to hold desc */
} drm_version32_t;
static int compat_drm_version(struct file *file, unsigned int cmd,
unsigned long arg)
{
drm_version32_t v32;
struct drm_version v;
int err;
if (copy_from_user(&v32, (void __user *)arg, sizeof(v32)))
return -EFAULT;
memset(&v, 0, sizeof(v));
v = (struct drm_version) {
.name_len = v32.name_len,
.name = compat_ptr(v32.name),
.date_len = v32.date_len,
.date = compat_ptr(v32.date),
.desc_len = v32.desc_len,
.desc = compat_ptr(v32.desc),
};
err = drm_ioctl_kernel(file, drm_version, &v,
DRM_RENDER_ALLOW);
if (err)
return err;
v32.version_major = v.version_major;
v32.version_minor = v.version_minor;
v32.version_patchlevel = v.version_patchlevel;
v32.name_len = v.name_len;
v32.date_len = v.date_len;
v32.desc_len = v.desc_len;
if (copy_to_user((void __user *)arg, &v32, sizeof(v32)))
return -EFAULT;
return 0;
}
typedef struct drm_unique32 {
u32 unique_len; /* Length of unique */
u32 unique; /* Unique name for driver instantiation */
} drm_unique32_t;
static int compat_drm_getunique(struct file *file, unsigned int cmd,
unsigned long arg)
{
drm_unique32_t uq32;
struct drm_unique uq;
int err;
if (copy_from_user(&uq32, (void __user *)arg, sizeof(uq32)))
return -EFAULT;
memset(&uq, 0, sizeof(uq));
uq = (struct drm_unique){
.unique_len = uq32.unique_len,
.unique = compat_ptr(uq32.unique),
};
err = drm_ioctl_kernel(file, drm_getunique, &uq, 0);
if (err)
return err;
uq32.unique_len = uq.unique_len;
if (copy_to_user((void __user *)arg, &uq32, sizeof(uq32)))
return -EFAULT;
return 0;
}
static int compat_drm_setunique(struct file *file, unsigned int cmd,
unsigned long arg)
{
/* it's dead */
return -EINVAL;
}
typedef struct drm_client32 {
int idx; /* Which client desired? */
int auth; /* Is client authenticated? */
u32 pid; /* Process ID */
u32 uid; /* User ID */
u32 magic; /* Magic */
u32 iocs; /* Ioctl count */
} drm_client32_t;
static int compat_drm_getclient(struct file *file, unsigned int cmd,
unsigned long arg)
{
drm_client32_t c32;
drm_client32_t __user *argp = (void __user *)arg;
struct drm_client client;
int err;
if (copy_from_user(&c32, argp, sizeof(c32)))
return -EFAULT;
memset(&client, 0, sizeof(client));
client.idx = c32.idx;
err = drm_ioctl_kernel(file, drm_getclient, &client, 0);
if (err)
return err;
c32.idx = client.idx;
c32.auth = client.auth;
c32.pid = client.pid;
c32.uid = client.uid;
c32.magic = client.magic;
c32.iocs = client.iocs;
if (copy_to_user(argp, &c32, sizeof(c32)))
return -EFAULT;
return 0;
}
typedef struct drm_stats32 {
u32 count;
struct {
u32 value;
enum drm_stat_type type;
} data[15];
} drm_stats32_t;
static int compat_drm_getstats(struct file *file, unsigned int cmd,
unsigned long arg)
{
drm_stats32_t __user *argp = (void __user *)arg;
/* getstats is defunct, just clear */
if (clear_user(argp, sizeof(drm_stats32_t)))
return -EFAULT;
return 0;
}
#if defined(CONFIG_X86)
typedef struct drm_update_draw32 {
drm_drawable_t handle;
unsigned int type;
unsigned int num;
/* 64-bit version has a 32-bit pad here */
u64 data; /**< Pointer */
} __packed drm_update_draw32_t;
static int compat_drm_update_draw(struct file *file, unsigned int cmd,
unsigned long arg)
{
/* update_draw is defunct */
return 0;
}
#endif
struct drm_wait_vblank_request32 {
enum drm_vblank_seq_type type;
unsigned int sequence;
u32 signal;
};
struct drm_wait_vblank_reply32 {
enum drm_vblank_seq_type type;
unsigned int sequence;
s32 tval_sec;
s32 tval_usec;
};
typedef union drm_wait_vblank32 {
struct drm_wait_vblank_request32 request;
struct drm_wait_vblank_reply32 reply;
} drm_wait_vblank32_t;
static int compat_drm_wait_vblank(struct file *file, unsigned int cmd,
unsigned long arg)
{
drm_wait_vblank32_t __user *argp = (void __user *)arg;
drm_wait_vblank32_t req32;
union drm_wait_vblank req;
int err;
if (copy_from_user(&req32, argp, sizeof(req32)))
return -EFAULT;
memset(&req, 0, sizeof(req));
req.request.type = req32.request.type;
req.request.sequence = req32.request.sequence;
req.request.signal = req32.request.signal;
err = drm_ioctl_kernel(file, drm_wait_vblank_ioctl, &req, 0);
req32.reply.type = req.reply.type;
req32.reply.sequence = req.reply.sequence;
req32.reply.tval_sec = req.reply.tval_sec;
req32.reply.tval_usec = req.reply.tval_usec;
if (copy_to_user(argp, &req32, sizeof(req32)))
return -EFAULT;
return err;
}
#if defined(CONFIG_X86)
typedef struct drm_mode_fb_cmd232 {
u32 fb_id;
u32 width;
u32 height;
u32 pixel_format;
u32 flags;
u32 handles[4];
u32 pitches[4];
u32 offsets[4];
u64 modifier[4];
} __packed drm_mode_fb_cmd232_t;
static int compat_drm_mode_addfb2(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct drm_mode_fb_cmd232 __user *argp = (void __user *)arg;
struct drm_mode_fb_cmd2 req64;
int err;
memset(&req64, 0, sizeof(req64));
if (copy_from_user(&req64, argp,
offsetof(drm_mode_fb_cmd232_t, modifier)))
return -EFAULT;
if (copy_from_user(&req64.modifier, &argp->modifier,
sizeof(req64.modifier)))
return -EFAULT;
err = drm_ioctl_kernel(file, drm_mode_addfb2, &req64, 0);
if (err)
return err;
if (put_user(req64.fb_id, &argp->fb_id))
return -EFAULT;
return 0;
}
#endif
static struct {
drm_ioctl_compat_t *fn;
char *name;
} drm_compat_ioctls[] = {
#define DRM_IOCTL32_DEF(n, f) [DRM_IOCTL_NR(n##32)] = {.fn = f, .name = #n}
DRM_IOCTL32_DEF(DRM_IOCTL_VERSION, compat_drm_version),
DRM_IOCTL32_DEF(DRM_IOCTL_GET_UNIQUE, compat_drm_getunique),
DRM_IOCTL32_DEF(DRM_IOCTL_GET_CLIENT, compat_drm_getclient),
DRM_IOCTL32_DEF(DRM_IOCTL_GET_STATS, compat_drm_getstats),
DRM_IOCTL32_DEF(DRM_IOCTL_SET_UNIQUE, compat_drm_setunique),
#if defined(CONFIG_X86)
DRM_IOCTL32_DEF(DRM_IOCTL_UPDATE_DRAW, compat_drm_update_draw),
#endif
DRM_IOCTL32_DEF(DRM_IOCTL_WAIT_VBLANK, compat_drm_wait_vblank),
#if defined(CONFIG_X86)
DRM_IOCTL32_DEF(DRM_IOCTL_MODE_ADDFB2, compat_drm_mode_addfb2),
#endif
};
/**
* drm_compat_ioctl - 32bit IOCTL compatibility handler for DRM drivers
* @filp: file this ioctl is called on
* @cmd: ioctl cmd number
* @arg: user argument
*
* Compatibility handler for 32 bit userspace running on 64 kernels. All actual
* IOCTL handling is forwarded to drm_ioctl(), while marshalling structures as
* appropriate. Note that this only handles DRM core IOCTLs, if the driver has
* botched IOCTL itself, it must handle those by wrapping this function.
*
* Returns:
* Zero on success, negative error code on failure.
*/
long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
unsigned int nr = DRM_IOCTL_NR(cmd);
struct drm_file *file_priv = filp->private_data;
struct drm_device *dev = file_priv->minor->dev;
drm_ioctl_compat_t *fn;
int ret;
/* Assume that ioctls without an explicit compat routine will just
* work. This may not always be a good assumption, but it's better
* than always failing.
*/
if (nr >= ARRAY_SIZE(drm_compat_ioctls))
return drm_ioctl(filp, cmd, arg);
fn = drm_compat_ioctls[nr].fn;
if (!fn)
return drm_ioctl(filp, cmd, arg);
drm_dbg_core(dev, "comm=\"%s\", pid=%d, dev=0x%lx, auth=%d, %s\n",
current->comm, task_pid_nr(current),
(long)old_encode_dev(file_priv->minor->kdev->devt),
file_priv->authenticated,
drm_compat_ioctls[nr].name);
ret = (*fn)(filp, cmd, arg);
if (ret)
drm_dbg_core(dev, "ret = %d\n", ret);
return ret;
}
EXPORT_SYMBOL(drm_compat_ioctl);
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