106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
/* SMP global caching code
|
|
*
|
|
* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* 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 */
|
|
|
|
/**
|
|
* smp_cache_interrupt - Handle IPI request to flush caches.
|
|
*
|
|
* Handle a request delivered by IPI to flush the current CPU's
|
|
* caches. The parameters are stored in smp_cache_*.
|
|
*/
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* smp_cache_call - Issue an IPI to request the other CPUs flush caches
|
|
* @opr_mask: Cache operation flags
|
|
* @start: Start address of request
|
|
* @end: End address of request
|
|
*
|
|
* Send cache flush IPI to other CPUs. This invokes smp_cache_interrupt()
|
|
* above on those other CPUs and then waits for them to finish.
|
|
*
|
|
* The caller must hold smp_cache_lock.
|
|
*/
|
|
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();
|
|
}
|