cache-smp.c

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/* SMP global caching code
 *
 * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/threads.h>
#include <linux/interrupt.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/smp.h>
#include "cache-smp.h"

DEFINE_SPINLOCK(smp_cache_lock);
static unsigned long smp_cache_mask;
static unsigned long smp_cache_start;
static unsigned long smp_cache_end;
static cpumask_t smp_cache_ipi_map;     /* Bitmask of cache IPI done CPUs */

void smp_cache_interrupt(void)
{
    unsigned long opr_mask = smp_cache_mask;

    switch ((enum smp_dcache_ops)(opr_mask & SMP_DCACHE_OP_MASK)) {
    case SMP_DCACHE_NOP:
        break;
    case SMP_DCACHE_INV:
        mn10300_local_dcache_inv();
        break;
    case SMP_DCACHE_INV_RANGE:
        mn10300_local_dcache_inv_range(smp_cache_start, smp_cache_end);
        break;
    case SMP_DCACHE_FLUSH:
        mn10300_local_dcache_flush();
        break;
    case SMP_DCACHE_FLUSH_RANGE:
        mn10300_local_dcache_flush_range(smp_cache_start,
                         smp_cache_end);
        break;
    case SMP_DCACHE_FLUSH_INV:
        mn10300_local_dcache_flush_inv();
        break;
    case SMP_DCACHE_FLUSH_INV_RANGE:
        mn10300_local_dcache_flush_inv_range(smp_cache_start,
                             smp_cache_end);
        break;
    }

    switch ((enum smp_icache_ops)(opr_mask & SMP_ICACHE_OP_MASK)) {
    case SMP_ICACHE_NOP:
        break;
    case SMP_ICACHE_INV:
        mn10300_local_icache_inv();
        break;
    case SMP_ICACHE_INV_RANGE:
        mn10300_local_icache_inv_range(smp_cache_start, smp_cache_end);
        break;
    }

    cpumask_clear_cpu(smp_processor_id(), &smp_cache_ipi_map);
}

void smp_cache_call(unsigned long opr_mask,
            unsigned long start, unsigned long end)
{
    smp_cache_mask = opr_mask;
    smp_cache_start = start;
    smp_cache_end = end;
    cpumask_copy(&smp_cache_ipi_map, cpu_online_mask);
    cpumask_clear_cpu(smp_processor_id(), &smp_cache_ipi_map);

    send_IPI_allbutself(FLUSH_CACHE_IPI);

    while (!cpumask_empty(&smp_cache_ipi_map))
        /* nothing. lockup detection does not belong here */
        mb();
}