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) 2008-2009 Silicon Graphics, Inc.  All Rights Reserved.

 */

​

/*

 * Cross Partition Communication (XPC) sn2-based functions.

 *

 *     Architecture specific implementation of common functions.

 *

 */

​

#include <linux/delay.h>

#include <linux/slab.h>

#include <asm/uncached.h>

#include <asm/sn/mspec.h>

#include <asm/sn/sn_sal.h>

#include "xpc.h"

​

/*

 * Define the number of u64s required to represent all the C-brick nasids

 * as a bitmap.  The cross-partition kernel modules deal only with

 * C-brick nasids, thus the need for bitmaps which don't account for

 * odd-numbered (non C-brick) nasids.

 */

#define XPC_MAX_PHYSNODES_SN2   (MAX_NUMALINK_NODES / 2)

#define XP_NASID_MASK_BYTES_SN2 ((XPC_MAX_PHYSNODES_SN2 + 7) / 8)

#define XP_NASID_MASK_WORDS_SN2 ((XPC_MAX_PHYSNODES_SN2 + 63) / 64)

​

/*

 * Memory for XPC's amo variables is allocated by the MSPEC driver. These

 * pages are located in the lowest granule. The lowest granule uses 4k pages

 * for cached references and an alternate TLB handler to never provide a

 * cacheable mapping for the entire region. This will prevent speculative

 * reading of cached copies of our lines from being issued which will cause

 * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64

 * amo variables (based on XP_MAX_NPARTITIONS_SN2) to identify the senders of

 * NOTIFY IRQs, 128 amo variables (based on XP_NASID_MASK_WORDS_SN2) to identify

 * the senders of ACTIVATE IRQs, 1 amo variable to identify which remote

 * partitions (i.e., XPCs) consider themselves currently engaged with the

 * local XPC and 1 amo variable to request partition deactivation.

 */

#define XPC_NOTIFY_IRQ_AMOS_SN2     0

#define XPC_ACTIVATE_IRQ_AMOS_SN2   (XPC_NOTIFY_IRQ_AMOS_SN2 + \

                     XP_MAX_NPARTITIONS_SN2)

#define XPC_ENGAGED_PARTITIONS_AMO_SN2  (XPC_ACTIVATE_IRQ_AMOS_SN2 + \

                     XP_NASID_MASK_WORDS_SN2)

#define XPC_DEACTIVATE_REQUEST_AMO_SN2  (XPC_ENGAGED_PARTITIONS_AMO_SN2 + 1)

​

/*

 * Buffer used to store a local copy of portions of a remote partition's

 * reserved page (either its header and part_nasids mask, or its vars).

 */

static void *xpc_remote_copy_buffer_base_sn2;

static char *xpc_remote_copy_buffer_sn2;

​

static struct xpc_vars_sn2 *xpc_vars_sn2;

static struct xpc_vars_part_sn2 *xpc_vars_part_sn2;

​

static int