linux-imx

/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 2004-2008 Silicon Graphics, Inc. All rights reserved.

 */

​

/*

 * External Cross Partition (XP) structures and defines.

 */

​

#ifndef _DRIVERS_MISC_SGIXP_XP_H

#define _DRIVERS_MISC_SGIXP_XP_H

​

#include <linux/mutex.h>

​

#if defined CONFIG_X86_UV || defined CONFIG_IA64_SGI_UV

#include <asm/uv/uv.h>

#define is_uv()     is_uv_system()

#endif

​

#ifndef is_uv

#define is_uv()     0

#endif

​

#if defined CONFIG_IA64

#include <asm/sn/arch.h>    /* defines is_shub1() and is_shub2() */

#define is_shub()   ia64_platform_is("sn2")

#endif

​

#ifndef is_shub1

#define is_shub1()  0

#endif

​

#ifndef is_shub2

#define is_shub2()  0

#endif

​

#ifndef is_shub

#define is_shub()   0

#endif

​

#ifdef USE_DBUG_ON

#define DBUG_ON(condition)  BUG_ON(condition)

#else

#define DBUG_ON(condition)

#endif

​

/*

 * Define the maximum number of partitions the system can possibly support.

 * It is based on the maximum number of hardware partitionable regions. The

 * term 'region' in this context refers to the minimum number of nodes that

 * can comprise an access protection grouping. The access protection is in

 * regards to memory, IPI and IOI.

 *

 * The maximum number of hardware partitionable regions is equal to the

 * maximum number of nodes in the entire system divided by the minimum number

 * of nodes that comprise an access protection grouping.

 */

#define XP_MAX_NPARTITIONS_SN2  64

#define XP_MAX_NPARTITIONS_UV   256

​

/*

 * XPC establishes channel connections between the local partition and any

 * other partition that is currently up. Over these channels, kernel-level

 * `users' can communicate with their counterparts on the other partitions.

 *

 * If the need for additional channels arises, one can simply increase

 * XPC_MAX_NCHANNELS accordingly. If the day should come where that number

 * exceeds the absolute MAXIMUM number of channels possible (eight), then one

 * will need to make changes to the XPC code to accommodate for this.

 *

 * The absolute maximum number of channels possible is limited to eight for

 * performance reasons on sn2 hardware. The internal cross partition structures

 * require sixteen bytes per channel, and eight allows all of this

 * interface-shared info to fit in one 128-byte cacheline.

 */

#define XPC_MEM_CHANNEL     0   /* memory channel number */

#define XPC_NET_CHANNEL     1   /* network channel number */

​

#define XPC_MAX_NCHANNELS   2   /* max #of channels allowed */

​

#if XPC_MAX_NCHANNELS > 8

#error  XPC_MAX_NCHANNELS exceeds absolute MAXIMUM possible.

#endif

​

/*

 * Define macro, XPC_MSG_SIZE(), is provided for the user

 * that wants to fit as many msg entries as possible in a given memory size

 * (e.g. a memory page).

 */