NetBSD/sys/compat/netbsd32/netbsd32_drm.c

/*	$NetBSD: netbsd32_drm.c,v 1.4 2019/09/28 15:15:34 christos Exp $ */

/*
 * Copyright (c) 2019 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code was written by Surya Shankar for GSoC 2019.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: netbsd32_drm.c,v 1.4 2019/09/28 15:15:34 christos Exp $");

#include <compat/netbsd32/netbsd32.h>
#include <compat/netbsd32/netbsd32_ioctl.h>

#include <linux/types.h>
#include <drm/drmP.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)

// Compat DRM Version Implementation

typedef struct {
	int version_major;		/**< Major version */
	int version_minor;		/**< Minor version */
	int version_patchlevel;		/**< Patch level */
	uint32_t name_len;		/**< Length of name buffer */
	netbsd32_pointer_t name;	/**< Name of driver */
	uint32_t date_len;		/**< Length of date buffer */
	netbsd32_pointer_t date;	/**< User-space buffer to hold date */
	uint32_t desc_len;		/**< Length of desc buffer */
	netbsd32_pointer_t desc;	/**< User-space buffer to hold desc */
} drm_version32_t;

static int
compat_drm_version(struct file *file, void *arg)
{
	drm_version32_t v32;
	struct drm_version v64;
	int error;

	if ((error = copyin(&v32, arg, sizeof(v32))) != 0)
		return error;

	v64.name_len = v32.name_len;
	v64.name = NETBSD32PTR64(v32.name);
	v64.date_len = v32.date_len;
	v64.date = NETBSD32PTR64(v32.date);
	v64.desc_len = v32.desc_len;
	v64.desc = NETBSD32PTR64(v32.desc);

	error = drm_ioctl(file, DRM_IOCTL_VERSION, &v64);
	if (error)
		return error;

	v32.version_major = v64.version_major;
	v32.version_minor = v64.version_minor;
	v32.version_patchlevel = v64.version_patchlevel;
	/* strings have already been copied in place */
	v32.name_len = v64.name_len;
	v32.date_len = v64.date_len;
	v32.desc_len = v64.desc_len;

	return copyout(arg, &v32, sizeof(v32));
}

typedef struct drm_unique32 {
	uint32_t unique_len; 
	netbsd32_pointer_t unique;    
} drm_unique32_t;

static int
compat_drm_getunique(struct file *file, void *arg)
{
	drm_unique32_t uq32;
	struct drm_unique uq64;
	int error;

	if ((error = copyin(&uq32, arg, sizeof(uq32))) != 0)
		return error;

	uq64.unique_len = uq32.unique_len;
	uq64.unique = NETBSD32PTR64(uq32.unique);

	error = drm_ioctl(file, DRM_IOCTL_GET_UNIQUE, &uq64);
	if (error)
		return error;

	//unique should already be copied
	uq32.unique_len = uq64.unique_len;

	if ((error = copyout(arg, &uq32, sizeof(uq32))) != 0)
		return error;

	return 0;
}

static int
compat_drm_setunique(struct file *file, void *arg)
{
	drm_unique32_t uq32;
	struct drm_unique uq64;
	int error;

	if ((error = copyin(&uq32, arg, sizeof(uq32))) != 0)
		return error;

	uq64.unique_len = uq32.unique_len;
	uq64.unique = NETBSD32PTR64(uq32.unique);
	
	error = drm_ioctl(file, DRM_IOCTL_SET_UNIQUE, &uq64);
	if (error)
		return error;

	// XXX: do we need copyout and copying the fields here?
	uq32.unique_len = uq64.unique_len;
	NETBSD32PTR32(uq32.unique, uq64.unique);

	return error;
}

typedef struct drm_map32 {
	uint32_t offset;	  /**< Req. physical address (0 for SAREA) */
	uint32_t size;		  /**< Requested physical size (bytes) */
	enum drm_map_type type;	  /**< Type of memory to map */
	enum drm_map_flags flags; /**< Flags */
	netbsd32_pointer_t handle;/**< User-space: "Handle" to pass to mmap() */
	int mtrr;		  /**< MTRR slot used */
} drm_map32_t;

static void
map32to64(struct drm_map *m64, const drm_map32_t *m32)
{
	m64->offset = m32->offset;
	m64->size = m32->size;
	m64->type = m32->type;
	m64->flags = m32->flags;
	m64->handle = NETBSD32PTR64(m32->handle);
	m64->mtrr = m32->mtrr;
}

static void
map64to32(drm_map32_t *m32, const struct drm_map *m64)
{
	m32->offset = m64->offset;
	m32->size = m64->size;
	m32->type = m64->type;
	m32->flags = m64->flags;
	NETBSD32PTR32(m32->handle, m64->handle);
	m32->mtrr = m64->mtrr;
}

static int
compat_drm_getmap(struct file *file, void *arg)
{
	drm_map32_t m32;
	struct drm_map m64;
	int error;

	if ((error = copyin(&m32, arg, sizeof(m32))) != 0)
		return error;

	map32to64(&m64, &m32);

	error = drm_ioctl(file, DRM_IOCTL_GET_MAP, &m64);
	if (error)
		return error;

	map64to32(&m32, &m64);

	return copyout(arg, &m32, sizeof(m32));
}

static int
compat_drm_addmap(struct file *file, void *arg)
{
	drm_map32_t m32;
	struct drm_map m64;
	int error;

	if ((error = copyin(&m32, arg, sizeof(m32))) != 0)
		return error;

	map32to64(&m64, &m32);

	error = drm_ioctl(file, DRM_IOCTL_ADD_MAP, &m64);
	if (error)
		return error;
	
	map64to32(&m32, &m64);

	return copyout(arg, &m32, sizeof(m32));
}


static int
compat_drm_rmmap(struct file *file, void *arg)
{
	drm_map32_t m32;
	struct drm_map m64;
	int error;
	if ((error = copyin(&m32, arg, sizeof(m32))) != 0)
		return error;

	map32to64(&m64, &m32);

	error = drm_ioctl(file, DRM_IOCTL_RM_MAP, &m64);
	if (error)
		return error;
	
	map64to32(&m32, &m64);

	return copyout(arg, &m32, sizeof(m32));
}

typedef struct drm_client32 {
	int idx;	/**< Which client desired? */
	int auth;	/**< Is client authenticated? */
	uint32_t pid;	/**< Process ID */
	uint32_t uid;	/**< User ID */
	uint32_t magic; /**< Magic */
	uint32_t iocs;	/**< Ioctl count */
} drm_client32_t;

static void
client32to64(struct drm_client *c64, const drm_client32_t *c32)
{
	c64->idx = c32->idx;
	c64->auth = c32->auth;
	c64->pid = c32->pid;
	c64->uid = c32->uid;
	c64->iocs = c64->iocs;
}

static void 
client64to32(drm_client32_t *c32, const struct drm_client *c64)
{
	c32->idx = c64->idx;
	c32->auth = c64->auth;
	c32->pid = c64->pid;
	c32->uid = c64->uid;
	c32->iocs = c64->iocs;
}
static int 
compat_drm_getclient(struct file *file, void *arg)
{
	drm_client32_t c32;
	struct drm_client c64;
	int error;
	
	if ((error = copyin(&c32, arg, sizeof(c32))) != 0)
		return error;

	client32to64(&c64, &c32);

	error = drm_ioctl(file, DRM_IOCTL_GET_CLIENT, &c64);
	if (error)
		return error;

	client64to32(&c32, &c64);

	return copyout(arg, &c32, sizeof(c32));
}

typedef struct drm_stats32 {
	uint32_t count;
	struct {
		uint32_t value;
		enum drm_stat_type type;
	} data[15];
} drm_stats32_t;

static int 
compat_drm_getstats(struct file *file, void *arg)
{
	drm_stats32_t st32;
	struct drm_stats st64;
	int error;

	if ((error = copyin(&st32, arg, sizeof(st32))) != 0)
		return error;

	st64.count = st32.count;
	if (st64.count > __arraycount(st64.data))
		return EINVAL;

	error = drm_ioctl(file, DRM_IOCTL_GET_STATS, &st64);
	if (error)
		return error;

	for (size_t i = 0; i < st64.count; ++i) {
		st32.data[i].value = st64.data[i].value;
		st32.data[i].type = st64.data[i].type;
	}
	st32.count = st64.count;

	return copyout(arg, &st32, sizeof(s32));
}

typedef struct drm_buf_desc32 {
	int count;		 /**< Number of buffers of this size */
	int size;		 /**< Size in bytes */
	int low_mark;		 /**< Low water mark */
	int high_mark;		 /**< High water mark */
	int flags;
	netbsd32_pointer_t agp_start;
				/**< Start address in the AGP aperture */
} drm_buf_desc32_t;

static int 
compat_drm_addbufs(struct file *file, void *arg)
{
	drm_buf_desc32_t buf32;
	struct drm_buf_desc buf64;
	int error;

	if ((error = copyin(&buf32, arg, sizeof(buf32))) != 0)
		return error;

	// XXX: assign 32->64
	buf64.agp_start = (unsigned long)NETBSD32PTR64(buf32.agp_start);

	error = drm_ioctl(file, DRM_IOCTL_ADD_BUFS, &buf64);
	if (error)
		return error;

	// XXX assign 64->32
	NETBSD32PTR32(buf32.agp_start, (void *)buf64.agp_start);

	return copyout(&buf32, arg, sizeof(buf32));
}

static int 
compat_drm_markbufs(struct file *file, void *arg)
{
	drm_buf_desc32_t b32;
	struct drm_buf_desc b64;
	int error;

	if ((error = copyin(&b32, arg, sizeof(b32))) != 0)
		return error;

	b64.size = b32.size;
	b64.low_mark = b32.low_mark;
	b64.high_mark = b32.high_mark; 
	//XXX: more stuff?

	return drm_ioctl(file, DRM_IOCTL_MARK_BUFS, &b64);
}

typedef struct drm_buf_info32 {
	int count;		 /**< Entries in list */
	netbsd32_pointer_t list;
} drm_buf_info32_t;

typedef struct drm_buf_pub32 {
	int idx;		 /**< Index into the master buffer list */
	int total;		 /**< Buffer size */
	int used;		 /**< Amount of buffer in use (for DMA) */
	uint32_t address;	 /**< Address of buffer */
} drm_buf_pub32_t;

typedef struct drm_buf_map32 {
	int count;		 /**< Length of the buffer list */
	uint32_t virtual;	 /**< Mmap'd area in user-virtual */
	netbsd32_pointer_t list; /**< Buffer information */
} drm_buf_map32_t;


typedef struct drm_buf_free32 {
	int count;
	netbsd32_pointer_t list;
} drm_buf_free32_t;

static int 
compat_drm_freebufs(struct file *file, void *arg)
{
	drm_buf_free32_t req32;
	struct drm_buf_free req64;
	int error;

	if ((error = copyin(&req32, arg, sizeof(req32))) != 0)
		return error;

	req64.count = req32.count;
	req64.list = NETBSD32PTR64(req32.list);

	return drm_ioctl(file, DRM_IOCTL_FREE_BUFS, &req64);
}

typedef struct drm_ctx_priv_map32 {
	unsigned int ctx_id;		 /**< Context requesting private mapping */
	netbsd32_pointer_t handle;	 /**< Handle of map */
} drm_ctx_priv_map32_t;

static int 
compat_drm_setsareactx(struct file *file, void *arg)
{
	drm_ctx_priv_map32_t req32;
	struct drm_ctx_priv_map req64;
	int error;

	if ((error = copyin(&req32, arg, sizeof(req32))) != 0)
		return error;

	req64.ctx_id = req32.ctx_id;
	req64.handle = NETBSD32PTR64(req32.handle);

	error = drm_ioctl(file, DRM_IOCTL_SET_SAREA_CTX, &req64);
	if(error)
		return error;
	
	req32.ctx_id = req64.ctx_id;
	NETBSD32PTR32(req32.handle, req64.handle);

	return 0;	
}

static int 
compat_drm_getsareactx(struct file *file, void *arg)
{
	struct drm_ctx_priv_map req64;
	drm_ctx_priv_map32_t req32;
	int error;

	if ((error = copyin(&req32, arg, sizeof(req32))) != 0)
		return error;

	req64.ctx_id = req32.ctx_id;

	error = drm_ioctl(file, DRM_IOCTL_GET_SAREA_CTX, &req64);
	if (error)
		return error;

	NETBSD32PTR32(req32.handle, req64.handle);
	// XXX: missing copyout?

	return copyout(arg, &req32, sizeof(req32));
}

typedef struct drm_ctx_res32 {
	int count;
	netbsd32_pointer_t contexts;
} drm_ctx_res32_t;

static int 
compat_drm_resctx(struct file *file, void *arg)
{
	drm_ctx_res32_t res32;
	struct drm_ctx_res res64;
	int error;

	if ((error = copyin(&res32, arg, sizeof(res32))) != 0)
		return error;

	res64.count = res32.count;
	res64.contexts = NETBSD32PTR64(res32.contexts);

	error = drm_ioctl(file, DRM_IOCTL_RES_CTX, &res64);
	if (error)
		return error;

	res32.count = res64.count;
	NETBSD32PTR32(res32.contexts, res64.contexts);
	/* XXX: missing copyout */

	return copyout(arg, &res32, sizeof(res32));
}

typedef struct drm_dma32 {
	int context;			  /**< Context handle */
	int send_count;			  /**< Number of buffers to send */
	netbsd32_pointer_t send_indices;  /**< List of handles to buffers */
	netbsd32_pointer_t send_sizes;	  /**< Lengths of data to send */
	enum drm_dma_flags flags;	  /**< Flags */
	netbsd32_pointer_t request_count; /**< Number of buffers requested */
	int request_size;		  /**< Desired size for buffers */
	netbsd32_pointer_t request_indices; /**< Buffer information */
	netbsd32_pointer_t request_sizes;
	int granted_count;		  /**< Number of buffers granted */
} drm_dma32_t;

static void 
dma64to32(drm_dma32_t *d32, const struct drm_dma *d64)
{
	d32->send_count = d64->send_count;
	NETBSD32PTR32(d32->send_indices, d64->send_indices);
	NETBSD32PTR32(d32->send_sizes, d64->send_sizes);
	d32->flags = d64->flags;
	NETBSD32PTR32(d32->request_count, (void *)(long)d64->request_count);
	NETBSD32PTR32(d32->request_indices, d64->request_indices);
	NETBSD32PTR32(d32->request_sizes, d64->request_sizes);

}

static void 
dma32to64(struct drm_dma *d64, const drm_dma32_t *d32)
{
	d64->request_size = d32->request_size;
	d64->granted_count = d32->granted_count;
}

static int 
compat_drm_dma(struct file *file, void *arg)
{
	drm_dma32_t d32;
	struct drm_dma d64;
	int error;

	if ((error = copyin(&d32, arg, sizeof(d32))) != 0)
		return error;

	dma32to64(&d64, &d32);

	error = drm_ioctl(file, DRM_IOCTL_DMA, &d64);
	if (error)
		return error;

	dma64to32(&d32, &d64);

	return copyout(arg, &d32, sizeof(d32));
}

//XXX:i commented the below line for later use
#if IS_ENABLED(CONFIG_AGP)
typedef struct drm_agp_mode32 {
	uint32_t mode;	/**< AGP mode */
} drm_agp_mode32_t;

static int 
compat_drm_agp_enable(struct file *file, void *arg)
{
	drm_agp_mode32_t m32;
	struct drm_agp_mode m64;
	int error;
	
	if ((error = copyin(&m32, arg, sizeof(m32))) != 0)
		return error;

	m64.mode = m32.mode;

	return drm_ioctl(file, DRM_IOCTL_AGP_ENABLE, &m64);
}

typedef struct drm_agp_info32 {
	int agp_version_major;
	int agp_version_minor;
	uint32_t mode;
	uint32_t aperture_base;		/* physical address */
	uint32_t aperture_size;		/* bytes */
	uint32_t memory_allowed;	/* bytes */
	uint32_t memory_used;

	/* PCI information */
	unsigned short id_vendor;
	unsigned short id_device;
} drm_agp_info32_t;

static void 
info64to32(drm_agp_info32_t *i32, const struct drm_agp_info *i64)
{
	i32->agp_version_major = i64->agp_version_major;
	i32->agp_version_minor = i64->agp_version_minor;
	i32->mode = i64->mode;
	i32->aperture_base = i64->aperture_base;
	i32->aperture_size = i64->aperture_size;
	i32->memory_allowed = i64->memory_allowed;
	i32->memory_used = i64->memory_used;
	i32->id_vendor = i64->id_vendor;
	i32->id_device = i64->id_device;
}

static int 
compat_drm_agp_info(struct file *file, void *arg)
{
	drm_agp_info32_t i32;
	struct drm_agp_info i64;
	int error;

	error = drm_ioctl(file, DRM_IOCTL_AGP_INFO, &i64);
	if (error)
		return error;
	
	info64to32(&i32, &i64);
	
	return copyout(arg, &i32, sizeof(i32));

}

typedef struct drm_agp_buffer32 {
	uint32_t size;		/**< In bytes -- will round to page boundary */
	uint32_t handle;	/**< Used for binding / unbinding */
	uint32_t type;		/**< Type of memory to allocate */
	uint32_t physical;	/**< Physical used by i810 */
} drm_agp_buffer32_t;

static int 
compat_drm_agp_alloc(struct file *file, void *arg)
{
	drm_agp_buffer32_t req32;
	struct drm_agp_buffer req64;
	int error;

	if ((error = copyin(&req32, arg, sizeof(req32))) != 0)
		return error;

	req64.size = req32.size;
	req64.type = req32.type;

	error = drm_ioctl(file, DRM_IOCTL_AGP_ALLOC, &req64);
	if (error)
		return error;

	req32.handle = req64.handle;
	req32.physical = req64.physical;
	
	drm_ioctl(file, DRM_IOCTL_AGP_FREE, &req64);
	
	return copyout(arg, &req32, sizeof(req32));
}

static int 
compat_drm_agp_free(struct file *file, void *arg)
{
	drm_agp_buffer32_t req32;
	struct drm_agp_buffer req64;
	int error;
	uint32_t handle;
		
	if ((error = copyin(&req32, arg, sizeof(req32))) != 0)
		return error;
	
	handle = req32.handle;
	req64.handle = handle;

	return drm_ioctl(file, DRM_IOCTL_AGP_FREE, &req64);
}

typedef struct drm_agp_binding32 {
	uint32_t handle;	/**< From drm_agp_buffer */
	uint32_t offset;	/**< In bytes -- will round to page boundary */
} drm_agp_binding32_t;

static int 
compat_drm_agp_bind(struct file *file, void *arg)
{
	drm_agp_binding32_t req32;
	struct drm_agp_binding req64;
	int error;

	if ((error = copyin(&req32, arg, sizeof(req32))) !=0 )
		return error;
	
	req64.handle = req32.handle;
	req64.offset = req32.offset;

	return drm_ioctl(file, DRM_IOCTL_AGP_BIND, &req64);
}

static int 
compat_drm_agp_unbind(struct file *file, void *arg)
{
	struct drm_agp_binding req64;
	drm_agp_binding32_t req32;
	uint32_t handle;
	int error;

	if ((error = copyin(&req32, arg, sizeof(req32))) != 0)
		return error;

	handle = req32.handle;
	req64.handle = handle;

	return drm_ioctl(file, DRM_IOCTL_AGP_UNBIND, &req64);
}
#endif /* CONFIG_AGP */

typedef struct drm_scatter_gather32 {
	uint32_t size;		/**< In bytes -- will round to page boundary */
	uint32_t handle;	/**< Used for mapping / unmapping */
} drm_scatter_gather32_t;

static int 
compat_drm_sg_alloc(struct file *file, void *arg)
{
	struct drm_scatter_gather req64;
	drm_scatter_gather32_t req32;
	int error;

	if ((error = copyin(&req32, arg, sizeof(req32))) != 0)	
		return error;

	req64.size = req32.size;

	error = drm_ioctl(file, DRM_IOCTL_SG_ALLOC, &req64);
	if (error)
		return error;

	/* XXX not sure about the handle conversion here... */
	req32.handle = req64.handle >> PAGE_SHIFT;

	return 0;
}

static int
compat_drm_sg_free(struct file *file, void *arg)
{
	struct drm_scatter_gather req64;
	unsigned long x;
	drm_scatter_gather32_t req32;
	int error;
	
	if((error = copyin(&req32, arg, sizeof(req32))) != 0)
		return error;
	
	x = req32.handle;
	req64.handle = x << PAGE_SHIFT;

	return drm_ioctl(file, DRM_IOCTL_SG_FREE, &req64);
}

#if defined(CONFIG_X86) || defined(CONFIG_IA64)
typedef struct drm_update_draw32 {
	drm_drawable_t handle;
	unsigned int type;
	unsigned int num;
	/* 64-bit version has a 32-bit pad here */
	uint64_t data;	/**< Pointer */
} __attribute__((__packed__)) drm_update_draw32_t;

static void 
update32to64(struct drm_update_draw *req64, const drm_update_draw32_t *update32)
{
	req64->handle = update32->handle;
	req64->type = update32->type;
	req64->num = update32->num;
	req64->data = update32->data;
}
static int 
compat_drm_update_draw(struct file *file, void *arg)
{
	drm_update_draw32_t update32;
	struct drm_update_draw req64;
	int error;
	
	if ((error = copyin(&update32, arg, sizeof(update32))) !=0)
		return error;

	update32to64(&req64, &update32);

	error = drm_ioctl(file, DRM_IOCTL_UPDATE_DRAW, &req64);
	return error;
}
#endif

struct drm_wait_vblank_request32 {
	enum drm_vblank_seq_type type;
	unsigned int sequence;
	uint32_t 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 void 
req32to64(union drm_wait_vblank *req64, const drm_wait_vblank32_t *req32)
{
	req64->request.type = req32->request.type;
	req64->request.sequence = req32->request.sequence;
	req64->request.signal = req32->request.signal;
}

static void 
req64to32(drm_wait_vblank32_t *req32, const union drm_wait_vblank *req64)
{
	req32->reply.sequence = req64->reply.sequence;
	req32->reply.tval_sec = req64->reply.tval_sec;
	req32->reply.tval_usec = req64->reply.tval_usec;
}

static int 
compat_drm_wait_vblank(struct file *file, void *arg)
{
	drm_wait_vblank32_t req32;
	union drm_wait_vblank req64;
	int error;
	
	if ((error = copyin(&req32, arg, sizeof(req32))) != 0)
		return error;

	req32to64(&req64, &req32);

	error = drm_ioctl(file, DRM_IOCTL_WAIT_VBLANK, &req64);
	if (error)
		return error;

	req64to32(&req32, &req64);

	return copyout(arg, &req32, sizeof(req32));
}

#if defined(CONFIG_X86) || defined(CONFIG_IA64)
typedef struct drm_mode_fb_cmd232 {
	uint32_t fb_id;
	uint32_t width;
	uint32_t height;
	uint32_t pixel_format;
	uint32_t flags;
	uint32_t handles[4];
	uint32_t pitches[4];
	uint32_t offsets[4];
	uint64_t modifier[4];
} __attribute__((__packed__)) drm_mode_fb_cmd232_t;

static void 
map_req32to64(struct drm_mode_fb_cmd2 *req64, struct drm_mode_fb_cmd232 *req32) 
{
	req64->width = req32->width;
	req64->height = req32->height;
	req64->pixel_format = req32->pixel_format;
	req64->flags = req32->flags;
}

static int 
compat_drm_mode_addfb2(struct file *file, void *arg)
{
	struct drm_mode_fb_cmd232 req32;
	struct drm_mode_fb_cmd2 req64;
	int error;

	if ((error = copyin(&req32, arg, sizeof(req32))) != 0)
		return error;

	map_req32to64(&req64, &req32);
	
	for (int i = 0; i < 4; i++){
		req64.handles[i] = req32.handles[i];
		req64.pitches[i] = req32.pitches[i];
		req64.offsets[i] = req32.offsets[i];
		req64.modifier[i] = req32.modifier[i];
	}

	error = drm_ioctl(file, DRM_IOCTL_MODE_ADDFB2, &req64);
	if (error)
		return error;

	req32.fb_id = req64.fb_id;

	return copyout(arg, &req32, sizeof(req32));
}
#endif

int
netbsd32_drm_ioctl(struct file *file, unsigned long cmd, void *arg,
    struct lwp *l)
{
	switch (cmd) {
	case DRM_IOCTL_VERSION32:
		return compat_drm_version(file, arg);
	case DRM_IOCTL_GET_UNIQUE32:
		return compat_drm_getunique(file, arg);
	case DRM_IOCTL_SET_UNIQUE32:
		return compat_drm_setunique(file, arg);
	case DRM_IOCTL_GET_MAP32:
		return compat_drm_getmap(file, arg);
	case DRM_IOCTL_ADD_MAP32:
		return compat_drm_addmap(file, arg);
	case DRM_IOCTL_RM_MAP32:
		return compat_drm_rmmap(file, arg);
	case DRM_IOCTL_GET_CLIENT32:
		return compat_drm_getclient(file, arg);
	case DRM_IOCTL_GET_STATS32:
		return compat_drm_getstats(file, arg);
	case DRM_IOCTL_ADD_BUFS32:
		return compat_drm_addbufs(file, arg);
	case DRM_IOCTL_MARK_BUFS32:
		return compat_drm_markbufs(file, arg);
	case DRM_IOCTL_FREE_BUFS32:
		return compat_drm_freebufs(file, arg);
	case DRM_IOCTL_SET_SAREA_CTX32:
		return compat_drm_setsareactx(file, arg);
	case DRM_IOCTL_GET_SAREA_CTX32:
		return compat_drm_getsareactx(file, arg);
	case DRM_IOCTL_RES_CTX32:
		return compat_drm_resctx(file, arg);
	case DRM_IOCTL_DMA32:
		return compat_drm_dma(file, arg);
	case  DRM_IOCTL_AGP_ENABLE32:
		return compat_drm_agp_enable(file, arg);
	case DRM_IOCTL_AGP_INFO32:
		return compat_drm_agp_info(file, arg);
	case DRM_IOCTL_AGP_ALLOC32:
		return compat_drm_agp_alloc(file,arg); 
	case DRM_IOCTL_AGP_UNBIND32:
		return compat_drm_agp_unbind(file, arg);
	case DRM_IOCTL_AGP_BIND32:
		return compat_drm_agp_bind(file, arg);
	case DRM_IOCTL_AGP_FREE32:
		return compat_drm_agp_free(file, arg); 
	case DRM_IOCTL_SG_ALLOC32:
		return compat_drm_sg_alloc(file, arg);
	case  DRM_IOCTL_MODE_ADDFB232:
		return compat_drm_mode_addfb2(file, arg);
	case DRM_IOCTL_WAIT_VBLANK32:
		return compat_drm_wait_vblank(file, arg);
	case DRM_IOCTL_UPDATE_DRAW32:
		return compat_drm_update_draw(file, arg);
	case DRM_IOCTL_SG_FREE32:
		return compat_drm_sg_free(file, arg);	
	default:
		return EINVAL;
	}
}