| Akira Takeuchi | 8be0628 | 2010-10-27 17:28:47 +0100 | [diff] [blame] | 1 | /* SMP global caching code |
| 2 | * |
| 3 | * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public Licence |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the Licence, or (at your option) any later version. |
| 10 | */ |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/mman.h> |
| 14 | #include <linux/threads.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <asm/page.h> |
| 17 | #include <asm/pgtable.h> |
| 18 | #include <asm/processor.h> |
| 19 | #include <asm/cacheflush.h> |
| 20 | #include <asm/io.h> |
| 21 | #include <asm/uaccess.h> |
| 22 | #include <asm/smp.h> |
| 23 | #include "cache-smp.h" |
| 24 | |
| 25 | DEFINE_SPINLOCK(smp_cache_lock); |
| 26 | static unsigned long smp_cache_mask; |
| 27 | static unsigned long smp_cache_start; |
| 28 | static unsigned long smp_cache_end; |
| 29 | static cpumask_t smp_cache_ipi_map; /* Bitmask of cache IPI done CPUs */ |
| 30 | |
| 31 | /** |
| 32 | * smp_cache_interrupt - Handle IPI request to flush caches. |
| 33 | * |
| 34 | * Handle a request delivered by IPI to flush the current CPU's |
| 35 | * caches. The parameters are stored in smp_cache_*. |
| 36 | */ |
| 37 | void smp_cache_interrupt(void) |
| 38 | { |
| 39 | unsigned long opr_mask = smp_cache_mask; |
| 40 | |
| 41 | switch ((enum smp_dcache_ops)(opr_mask & SMP_DCACHE_OP_MASK)) { |
| 42 | case SMP_DCACHE_NOP: |
| 43 | break; |
| 44 | case SMP_DCACHE_INV: |
| 45 | mn10300_local_dcache_inv(); |
| 46 | break; |
| 47 | case SMP_DCACHE_INV_RANGE: |
| 48 | mn10300_local_dcache_inv_range(smp_cache_start, smp_cache_end); |
| 49 | break; |
| 50 | case SMP_DCACHE_FLUSH: |
| 51 | mn10300_local_dcache_flush(); |
| 52 | break; |
| 53 | case SMP_DCACHE_FLUSH_RANGE: |
| 54 | mn10300_local_dcache_flush_range(smp_cache_start, |
| 55 | smp_cache_end); |
| 56 | break; |
| 57 | case SMP_DCACHE_FLUSH_INV: |
| 58 | mn10300_local_dcache_flush_inv(); |
| 59 | break; |
| 60 | case SMP_DCACHE_FLUSH_INV_RANGE: |
| 61 | mn10300_local_dcache_flush_inv_range(smp_cache_start, |
| 62 | smp_cache_end); |
| 63 | break; |
| 64 | } |
| 65 | |
| 66 | switch ((enum smp_icache_ops)(opr_mask & SMP_ICACHE_OP_MASK)) { |
| 67 | case SMP_ICACHE_NOP: |
| 68 | break; |
| 69 | case SMP_ICACHE_INV: |
| 70 | mn10300_local_icache_inv(); |
| 71 | break; |
| 72 | case SMP_ICACHE_INV_RANGE: |
| 73 | mn10300_local_icache_inv_range(smp_cache_start, smp_cache_end); |
| 74 | break; |
| 75 | } |
| 76 | |
| 77 | cpu_clear(smp_processor_id(), smp_cache_ipi_map); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * smp_cache_call - Issue an IPI to request the other CPUs flush caches |
| 82 | * @opr_mask: Cache operation flags |
| 83 | * @start: Start address of request |
| 84 | * @end: End address of request |
| 85 | * |
| 86 | * Send cache flush IPI to other CPUs. This invokes smp_cache_interrupt() |
| 87 | * above on those other CPUs and then waits for them to finish. |
| 88 | * |
| 89 | * The caller must hold smp_cache_lock. |
| 90 | */ |
| 91 | void smp_cache_call(unsigned long opr_mask, |
| 92 | unsigned long start, unsigned long end) |
| 93 | { |
| 94 | smp_cache_mask = opr_mask; |
| 95 | smp_cache_start = start; |
| 96 | smp_cache_end = end; |
| 97 | smp_cache_ipi_map = cpu_online_map; |
| 98 | cpu_clear(smp_processor_id(), smp_cache_ipi_map); |
| 99 | |
| 100 | send_IPI_allbutself(FLUSH_CACHE_IPI); |
| 101 | |
| 102 | while (!cpus_empty(smp_cache_ipi_map)) |
| 103 | /* nothing. lockup detection does not belong here */ |
| 104 | mb(); |
| 105 | } |