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.

 */

​

/*

 * Cross Partition Communication (XPC) partition support.

 *

 *  This is the part of XPC that detects the presence/absence of

 *  other partitions. It provides a heartbeat and monitors the

 *  heartbeats of other partitions.

 *

 */

​

#include <linux/device.h>

#include <linux/hardirq.h>

#include <linux/slab.h>

#include "xpc.h"

#include <asm/uv/uv_hub.h>

​

/* XPC is exiting flag */

int xpc_exiting;

​

/* this partition's reserved page pointers */

struct xpc_rsvd_page *xpc_rsvd_page;

static unsigned long *xpc_part_nasids;

unsigned long *xpc_mach_nasids;

​

static int xpc_nasid_mask_nbytes;   /* #of bytes in nasid mask */

int xpc_nasid_mask_nlongs;  /* #of longs in nasid mask */

​

struct xpc_partition *xpc_partitions;

​

/*

 * Guarantee that the kmalloc'd memory is cacheline aligned.

 */

void *

xpc_kmalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)

{

    /* see if kmalloc will give us cachline aligned memory by default */

    *base = kmalloc(size, flags);

    if (*base == NULL)

        return NULL;

​

    if ((u64)*base == L1_CACHE_ALIGN((u64)*base))

        return *base;

​

    kfree(*base);

​

    /* nope, we'll have to do it ourselves */

    *base = kmalloc(size + L1_CACHE_BYTES, flags);

    if (*base == NULL)

        return NULL;

​

    return (void *)L1_CACHE_ALIGN((u64)*base);

}

​

/*

 * Given a nasid, get the physical address of the  partition's reserved page

 * for that nasid. This function returns 0 on any error.