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8be06289 AT |
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 | ||
8ea9716f | 77 | cpumask_clear_cpu(smp_processor_id(), &smp_cache_ipi_map); |
8be06289 AT |
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; | |
8ea9716f KM |
97 | cpumask_copy(&smp_cache_ipi_map, cpu_online_mask); |
98 | cpumask_clear_cpu(smp_processor_id(), &smp_cache_ipi_map); | |
8be06289 AT |
99 | |
100 | send_IPI_allbutself(FLUSH_CACHE_IPI); | |
101 | ||
8ea9716f | 102 | while (!cpumask_empty(&smp_cache_ipi_map)) |
8be06289 AT |
103 | /* nothing. lockup detection does not belong here */ |
104 | mb(); | |
105 | } |