linux/arch/sh/mm/cache.c
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   1/*
   2 * arch/sh/mm/cache.c
   3 *
   4 * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
   5 * Copyright (C) 2002 - 2010  Paul Mundt
   6 *
   7 * Released under the terms of the GNU GPL v2.0.
   8 */
   9#include <linux/mm.h>
  10#include <linux/init.h>
  11#include <linux/mutex.h>
  12#include <linux/fs.h>
  13#include <linux/smp.h>
  14#include <linux/highmem.h>
  15#include <linux/module.h>
  16#include <asm/mmu_context.h>
  17#include <asm/cacheflush.h>
  18
  19void (*local_flush_cache_all)(void *args) = cache_noop;
  20void (*local_flush_cache_mm)(void *args) = cache_noop;
  21void (*local_flush_cache_dup_mm)(void *args) = cache_noop;
  22void (*local_flush_cache_page)(void *args) = cache_noop;
  23void (*local_flush_cache_range)(void *args) = cache_noop;
  24void (*local_flush_dcache_page)(void *args) = cache_noop;
  25void (*local_flush_icache_range)(void *args) = cache_noop;
  26void (*local_flush_icache_page)(void *args) = cache_noop;
  27void (*local_flush_cache_sigtramp)(void *args) = cache_noop;
  28
  29void (*__flush_wback_region)(void *start, int size);
  30EXPORT_SYMBOL(__flush_wback_region);
  31void (*__flush_purge_region)(void *start, int size);
  32EXPORT_SYMBOL(__flush_purge_region);
  33void (*__flush_invalidate_region)(void *start, int size);
  34EXPORT_SYMBOL(__flush_invalidate_region);
  35
  36static inline void noop__flush_region(void *start, int size)
  37{
  38}
  39
  40static inline void cacheop_on_each_cpu(void (*func) (void *info), void *info,
  41                                   int wait)
  42{
  43        preempt_disable();
  44
  45        /*
  46         * It's possible that this gets called early on when IRQs are
  47         * still disabled due to ioremapping by the boot CPU, so don't
  48         * even attempt IPIs unless there are other CPUs online.
  49         */
  50        if (num_online_cpus() > 1)
  51                smp_call_function(func, info, wait);
  52
  53        func(info);
  54
  55        preempt_enable();
  56}
  57
  58void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
  59                       unsigned long vaddr, void *dst, const void *src,
  60                       unsigned long len)
  61{
  62        if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
  63            test_bit(PG_dcache_clean, &page->flags)) {
  64                void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  65                memcpy(vto, src, len);
  66                kunmap_coherent(vto);
  67        } else {
  68                memcpy(dst, src, len);
  69                if (boot_cpu_data.dcache.n_aliases)
  70                        clear_bit(PG_dcache_clean, &page->flags);
  71        }
  72
  73        if (vma->vm_flags & VM_EXEC)
  74                flush_cache_page(vma, vaddr, page_to_pfn(page));
  75}
  76
  77void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
  78                         unsigned long vaddr, void *dst, const void *src,
  79                         unsigned long len)
  80{
  81        if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
  82            test_bit(PG_dcache_clean, &page->flags)) {
  83                void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  84                memcpy(dst, vfrom, len);
  85                kunmap_coherent(vfrom);
  86        } else {
  87                memcpy(dst, src, len);
  88                if (boot_cpu_data.dcache.n_aliases)
  89                        clear_bit(PG_dcache_clean, &page->flags);
  90        }
  91}
  92
  93void copy_user_highpage(struct page *to, struct page *from,
  94                        unsigned long vaddr, struct vm_area_struct *vma)
  95{
  96        void *vfrom, *vto;
  97
  98        vto = kmap_atomic(to, KM_USER1);
  99
 100        if (boot_cpu_data.dcache.n_aliases && page_mapped(from) &&
 101            test_bit(PG_dcache_clean, &from->flags)) {
 102                vfrom = kmap_coherent(from, vaddr);
 103                copy_page(vto, vfrom);
 104                kunmap_coherent(vfrom);
 105        } else {
 106                vfrom = kmap_atomic(from, KM_USER0);
 107                copy_page(vto, vfrom);
 108                kunmap_atomic(vfrom, KM_USER0);
 109        }
 110
 111        if (pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK) ||
 112            (vma->vm_flags & VM_EXEC))
 113                __flush_purge_region(vto, PAGE_SIZE);
 114
 115        kunmap_atomic(vto, KM_USER1);
 116        /* Make sure this page is cleared on other CPU's too before using it */
 117        smp_wmb();
 118}
 119EXPORT_SYMBOL(copy_user_highpage);
 120
 121void clear_user_highpage(struct page *page, unsigned long vaddr)
 122{
 123        void *kaddr = kmap_atomic(page, KM_USER0);
 124
 125        clear_page(kaddr);
 126
 127        if (pages_do_alias((unsigned long)kaddr, vaddr & PAGE_MASK))
 128                __flush_purge_region(kaddr, PAGE_SIZE);
 129
 130        kunmap_atomic(kaddr, KM_USER0);
 131}
 132EXPORT_SYMBOL(clear_user_highpage);
 133
 134void __update_cache(struct vm_area_struct *vma,
 135                    unsigned long address, pte_t pte)
 136{
 137        struct page *page;
 138        unsigned long pfn = pte_pfn(pte);
 139
 140        if (!boot_cpu_data.dcache.n_aliases)
 141                return;
 142
 143        page = pfn_to_page(pfn);
 144        if (pfn_valid(pfn)) {
 145                int dirty = !test_and_set_bit(PG_dcache_clean, &page->flags);
 146                if (dirty)
 147                        __flush_purge_region(page_address(page), PAGE_SIZE);
 148        }
 149}
 150
 151void __flush_anon_page(struct page *page, unsigned long vmaddr)
 152{
 153        unsigned long addr = (unsigned long) page_address(page);
 154
 155        if (pages_do_alias(addr, vmaddr)) {
 156                if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
 157                    test_bit(PG_dcache_clean, &page->flags)) {
 158                        void *kaddr;
 159
 160                        kaddr = kmap_coherent(page, vmaddr);
 161                        /* XXX.. For now kunmap_coherent() does a purge */
 162                        /* __flush_purge_region((void *)kaddr, PAGE_SIZE); */
 163                        kunmap_coherent(kaddr);
 164                } else
 165                        __flush_purge_region((void *)addr, PAGE_SIZE);
 166        }
 167}
 168
 169void flush_cache_all(void)
 170{
 171        cacheop_on_each_cpu(local_flush_cache_all, NULL, 1);
 172}
 173EXPORT_SYMBOL(flush_cache_all);
 174
 175void flush_cache_mm(struct mm_struct *mm)
 176{
 177        if (boot_cpu_data.dcache.n_aliases == 0)
 178                return;
 179
 180        cacheop_on_each_cpu(local_flush_cache_mm, mm, 1);
 181}
 182
 183void flush_cache_dup_mm(struct mm_struct *mm)
 184{
 185        if (boot_cpu_data.dcache.n_aliases == 0)
 186                return;
 187
 188        cacheop_on_each_cpu(local_flush_cache_dup_mm, mm, 1);
 189}
 190
 191void flush_cache_page(struct vm_area_struct *vma, unsigned long addr,
 192                      unsigned long pfn)
 193{
 194        struct flusher_data data;
 195
 196        data.vma = vma;
 197        data.addr1 = addr;
 198        data.addr2 = pfn;
 199
 200        cacheop_on_each_cpu(local_flush_cache_page, (void *)&data, 1);
 201}
 202
 203void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
 204                       unsigned long end)
 205{
 206        struct flusher_data data;
 207
 208        data.vma = vma;
 209        data.addr1 = start;
 210        data.addr2 = end;
 211
 212        cacheop_on_each_cpu(local_flush_cache_range, (void *)&data, 1);
 213}
 214EXPORT_SYMBOL(flush_cache_range);
 215
 216void flush_dcache_page(struct page *page)
 217{
 218        cacheop_on_each_cpu(local_flush_dcache_page, page, 1);
 219}
 220EXPORT_SYMBOL(flush_dcache_page);
 221
 222void flush_icache_range(unsigned long start, unsigned long end)
 223{
 224        struct flusher_data data;
 225
 226        data.vma = NULL;
 227        data.addr1 = start;
 228        data.addr2 = end;
 229
 230        cacheop_on_each_cpu(local_flush_icache_range, (void *)&data, 1);
 231}
 232
 233void flush_icache_page(struct vm_area_struct *vma, struct page *page)
 234{
 235        /* Nothing uses the VMA, so just pass the struct page along */
 236        cacheop_on_each_cpu(local_flush_icache_page, page, 1);
 237}
 238
 239void flush_cache_sigtramp(unsigned long address)
 240{
 241        cacheop_on_each_cpu(local_flush_cache_sigtramp, (void *)address, 1);
 242}
 243
 244static void compute_alias(struct cache_info *c)
 245{
 246        c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
 247        c->n_aliases = c->alias_mask ? (c->alias_mask >> PAGE_SHIFT) + 1 : 0;
 248}
 249
 250static void __init emit_cache_params(void)
 251{
 252        printk(KERN_NOTICE "I-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 253                boot_cpu_data.icache.ways,
 254                boot_cpu_data.icache.sets,
 255                boot_cpu_data.icache.way_incr);
 256        printk(KERN_NOTICE "I-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 257                boot_cpu_data.icache.entry_mask,
 258                boot_cpu_data.icache.alias_mask,
 259                boot_cpu_data.icache.n_aliases);
 260        printk(KERN_NOTICE "D-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 261                boot_cpu_data.dcache.ways,
 262                boot_cpu_data.dcache.sets,
 263                boot_cpu_data.dcache.way_incr);
 264        printk(KERN_NOTICE "D-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 265                boot_cpu_data.dcache.entry_mask,
 266                boot_cpu_data.dcache.alias_mask,
 267                boot_cpu_data.dcache.n_aliases);
 268
 269        /*
 270         * Emit Secondary Cache parameters if the CPU has a probed L2.
 271         */
 272        if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
 273                printk(KERN_NOTICE "S-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 274                        boot_cpu_data.scache.ways,
 275                        boot_cpu_data.scache.sets,
 276                        boot_cpu_data.scache.way_incr);
 277                printk(KERN_NOTICE "S-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 278                        boot_cpu_data.scache.entry_mask,
 279                        boot_cpu_data.scache.alias_mask,
 280                        boot_cpu_data.scache.n_aliases);
 281        }
 282}
 283
 284void __init cpu_cache_init(void)
 285{
 286        unsigned int cache_disabled = 0;
 287
 288#ifdef CCR
 289        cache_disabled = !(__raw_readl(CCR) & CCR_CACHE_ENABLE);
 290#endif
 291
 292        compute_alias(&boot_cpu_data.icache);
 293        compute_alias(&boot_cpu_data.dcache);
 294        compute_alias(&boot_cpu_data.scache);
 295
 296        __flush_wback_region            = noop__flush_region;
 297        __flush_purge_region            = noop__flush_region;
 298        __flush_invalidate_region       = noop__flush_region;
 299
 300        /*
 301         * No flushing is necessary in the disabled cache case so we can
 302         * just keep the noop functions in local_flush_..() and __flush_..()
 303         */
 304        if (unlikely(cache_disabled))
 305                goto skip;
 306
 307        if (boot_cpu_data.family == CPU_FAMILY_SH2) {
 308                extern void __weak sh2_cache_init(void);
 309
 310                sh2_cache_init();
 311        }
 312
 313        if (boot_cpu_data.family == CPU_FAMILY_SH2A) {
 314                extern void __weak sh2a_cache_init(void);
 315
 316                sh2a_cache_init();
 317        }
 318
 319        if (boot_cpu_data.family == CPU_FAMILY_SH3) {
 320                extern void __weak sh3_cache_init(void);
 321
 322                sh3_cache_init();
 323
 324                if ((boot_cpu_data.type == CPU_SH7705) &&
 325                    (boot_cpu_data.dcache.sets == 512)) {
 326                        extern void __weak sh7705_cache_init(void);
 327
 328                        sh7705_cache_init();
 329                }
 330        }
 331
 332        if ((boot_cpu_data.family == CPU_FAMILY_SH4) ||
 333            (boot_cpu_data.family == CPU_FAMILY_SH4A) ||
 334            (boot_cpu_data.family == CPU_FAMILY_SH4AL_DSP)) {
 335                extern void __weak sh4_cache_init(void);
 336
 337                sh4_cache_init();
 338
 339                if ((boot_cpu_data.type == CPU_SH7786) ||
 340                    (boot_cpu_data.type == CPU_SHX3)) {
 341                        extern void __weak shx3_cache_init(void);
 342
 343                        shx3_cache_init();
 344                }
 345        }
 346
 347        if (boot_cpu_data.family == CPU_FAMILY_SH5) {
 348                extern void __weak sh5_cache_init(void);
 349
 350                sh5_cache_init();
 351        }
 352
 353skip:
 354        emit_cache_params();
 355}
 356