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   1 /*
   2  * arch/sh/mm/cache.c
   3  *
   4  * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
   5  * Copyright (C) 2002 - 2009  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
  19 void (*local_flush_cache_all)(void *args) = cache_noop;
  20 void (*local_flush_cache_mm)(void *args) = cache_noop;
  21 void (*local_flush_cache_dup_mm)(void *args) = cache_noop;
  22 void (*local_flush_cache_page)(void *args) = cache_noop;
  23 void (*local_flush_cache_range)(void *args) = cache_noop;
  24 void (*local_flush_dcache_page)(void *args) = cache_noop;
  25 void (*local_flush_icache_range)(void *args) = cache_noop;
  26 void (*local_flush_icache_page)(void *args) = cache_noop;
  27 void (*local_flush_cache_sigtramp)(void *args) = cache_noop;
  28
  29 void (*__flush_wback_region)(void *start, int size);
  30 void (*__flush_purge_region)(void *start, int size);
  31 void (*__flush_invalidate_region)(void *start, int size);
  32
  33 static inline void noop__flush_region(void *start, int size)
  34 {
  35 }
  36
  37 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
  38                        unsigned long vaddr, void *dst, const void *src,
  39                        unsigned long len)
  40 {
  41         if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
  42             !test_bit(PG_dcache_dirty, &page->flags)) {
  43                 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  44                 memcpy(vto, src, len);
  45                 kunmap_coherent();
  46         } else {
  47                 memcpy(dst, src, len);
  48                 if (boot_cpu_data.dcache.n_aliases)
  49                         set_bit(PG_dcache_dirty, &page->flags);
  50         }
  51
  52         if (vma->vm_flags & VM_EXEC)
  53                 flush_cache_page(vma, vaddr, page_to_pfn(page));
  54 }
  55
  56 void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
  57                          unsigned long vaddr, void *dst, const void *src,
  58                          unsigned long len)
  59 {
  60         if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
  61             !test_bit(PG_dcache_dirty, &page->flags)) {
  62                 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  63                 memcpy(dst, vfrom, len);
  64                 kunmap_coherent();
  65         } else {
  66                 memcpy(dst, src, len);
  67                 if (boot_cpu_data.dcache.n_aliases)
  68                         set_bit(PG_dcache_dirty, &page->flags);
  69         }
  70 }
  71
  72 void copy_user_highpage(struct page *to, struct page *from,
  73                         unsigned long vaddr, struct vm_area_struct *vma)
  74 {
  75         void *vfrom, *vto;
  76
  77         vto = kmap_atomic(to, KM_USER1);
  78
  79         if (boot_cpu_data.dcache.n_aliases && page_mapped(from) &&
  80             !test_bit(PG_dcache_dirty, &from->flags)) {
  81                 vfrom = kmap_coherent(from, vaddr);
  82                 copy_page(vto, vfrom);
  83                 kunmap_coherent();
  84         } else {
  85                 vfrom = kmap_atomic(from, KM_USER0);
  86                 copy_page(vto, vfrom);
  87                 kunmap_atomic(vfrom, KM_USER0);
  88         }
  89
  90         if (pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
  91                 __flush_wback_region(vto, PAGE_SIZE);
  92
  93         kunmap_atomic(vto, KM_USER1);
  94         /* Make sure this page is cleared on other CPU's too before using it */
  95         smp_wmb();
  96 }
  97 EXPORT_SYMBOL(copy_user_highpage);
  98
  99 void clear_user_highpage(struct page *page, unsigned long vaddr)
 100 {
 101         void *kaddr = kmap_atomic(page, KM_USER0);
 102
 103         clear_page(kaddr);
 104
 105         if (pages_do_alias((unsigned long)kaddr, vaddr & PAGE_MASK))
 106                 __flush_wback_region(kaddr, PAGE_SIZE);
 107
 108         kunmap_atomic(kaddr, KM_USER0);
 109 }
 110 EXPORT_SYMBOL(clear_user_highpage);
 111
 112 void __update_cache(struct vm_area_struct *vma,
 113                     unsigned long address, pte_t pte)
 114 {
 115         struct page *page;
 116         unsigned long pfn = pte_pfn(pte);
 117
 118         if (!boot_cpu_data.dcache.n_aliases)
 119                 return;
 120
 121         page = pfn_to_page(pfn);
 122         if (pfn_valid(pfn) && page_mapping(page)) {
 123                 int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
 124                 if (dirty) {
 125                         unsigned long addr = (unsigned long)page_address(page);
 126
 127                         if (pages_do_alias(addr, address & PAGE_MASK))
 128                                 __flush_wback_region((void *)addr, PAGE_SIZE);
 129                 }
 130         }
 131 }
 132
 133 void __flush_anon_page(struct page *page, unsigned long vmaddr)
 134 {
 135         unsigned long addr = (unsigned long) page_address(page);
 136
 137         if (pages_do_alias(addr, vmaddr)) {
 138                 if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
 139                     !test_bit(PG_dcache_dirty, &page->flags)) {
 140                         void *kaddr;
 141
 142                         kaddr = kmap_coherent(page, vmaddr);
 143                         __flush_wback_region((void *)kaddr, PAGE_SIZE);
 144                         kunmap_coherent();
 145                 } else
 146                         __flush_wback_region((void *)addr, PAGE_SIZE);
 147         }
 148 }
 149
 150 void flush_cache_all(void)
 151 {
 152         on_each_cpu(local_flush_cache_all, NULL, 1);
 153 }
 154
 155 void flush_cache_mm(struct mm_struct *mm)
 156 {
 157         on_each_cpu(local_flush_cache_mm, mm, 1);
 158 }
 159
 160 void flush_cache_dup_mm(struct mm_struct *mm)
 161 {
 162         on_each_cpu(local_flush_cache_dup_mm, mm, 1);
 163 }
 164
 165 void flush_cache_page(struct vm_area_struct *vma, unsigned long addr,
 166                       unsigned long pfn)
 167 {
 168         struct flusher_data data;
 169
 170         data.vma = vma;
 171         data.addr1 = addr;
 172         data.addr2 = pfn;
 173
 174         on_each_cpu(local_flush_cache_page, (void *)&data, 1);
 175 }
 176
 177 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
 178                        unsigned long end)
 179 {
 180         struct flusher_data data;
 181
 182         data.vma = vma;
 183         data.addr1 = start;
 184         data.addr2 = end;
 185
 186         on_each_cpu(local_flush_cache_range, (void *)&data, 1);
 187 }
 188
 189 void flush_dcache_page(struct page *page)
 190 {
 191         on_each_cpu(local_flush_dcache_page, page, 1);
 192 }
 193
 194 void flush_icache_range(unsigned long start, unsigned long end)
 195 {
 196         struct flusher_data data;
 197
 198         data.vma = NULL;
 199         data.addr1 = start;
 200         data.addr2 = end;
 201
 202         on_each_cpu(local_flush_icache_range, (void *)&data, 1);
 203 }
 204
 205 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
 206 {
 207         /* Nothing uses the VMA, so just pass the struct page along */
 208         on_each_cpu(local_flush_icache_page, page, 1);
 209 }
 210
 211 void flush_cache_sigtramp(unsigned long address)
 212 {
 213         on_each_cpu(local_flush_cache_sigtramp, (void *)address, 1);
 214 }
 215
 216 static void compute_alias(struct cache_info *c)
 217 {
 218         c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
 219         c->n_aliases = c->alias_mask ? (c->alias_mask >> PAGE_SHIFT) + 1 : 0;
 220 }
 221
 222 static void __init emit_cache_params(void)
 223 {
 224         printk(KERN_NOTICE "I-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 225                 boot_cpu_data.icache.ways,
 226                 boot_cpu_data.icache.sets,
 227                 boot_cpu_data.icache.way_incr);
 228         printk(KERN_NOTICE "I-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 229                 boot_cpu_data.icache.entry_mask,
 230                 boot_cpu_data.icache.alias_mask,
 231                 boot_cpu_data.icache.n_aliases);
 232         printk(KERN_NOTICE "D-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 233                 boot_cpu_data.dcache.ways,
 234                 boot_cpu_data.dcache.sets,
 235                 boot_cpu_data.dcache.way_incr);
 236         printk(KERN_NOTICE "D-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 237                 boot_cpu_data.dcache.entry_mask,
 238                 boot_cpu_data.dcache.alias_mask,
 239                 boot_cpu_data.dcache.n_aliases);
 240
 241         /*
 242          * Emit Secondary Cache parameters if the CPU has a probed L2.
 243          */
 244         if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
 245                 printk(KERN_NOTICE "S-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 246                         boot_cpu_data.scache.ways,
 247                         boot_cpu_data.scache.sets,
 248                         boot_cpu_data.scache.way_incr);
 249                 printk(KERN_NOTICE "S-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 250                         boot_cpu_data.scache.entry_mask,
 251                         boot_cpu_data.scache.alias_mask,
 252                         boot_cpu_data.scache.n_aliases);
 253         }
 254 }
 255
 256 void __init cpu_cache_init(void)
 257 {
 258         compute_alias(&boot_cpu_data.icache);
 259         compute_alias(&boot_cpu_data.dcache);
 260         compute_alias(&boot_cpu_data.scache);
 261
 262         __flush_wback_region            = noop__flush_region;
 263         __flush_purge_region            = noop__flush_region;
 264         __flush_invalidate_region       = noop__flush_region;
 265
 266         if (boot_cpu_data.family == CPU_FAMILY_SH2) {
 267                 extern void __weak sh2_cache_init(void);
 268
 269                 sh2_cache_init();
 270         }
 271
 272         if (boot_cpu_data.family == CPU_FAMILY_SH2A) {
 273                 extern void __weak sh2a_cache_init(void);
 274
 275                 sh2a_cache_init();
 276         }
 277
 278         if (boot_cpu_data.family == CPU_FAMILY_SH3) {
 279                 extern void __weak sh3_cache_init(void);
 280
 281                 sh3_cache_init();
 282
 283                 if ((boot_cpu_data.type == CPU_SH7705) &&
 284                     (boot_cpu_data.dcache.sets == 512)) {
 285                         extern void __weak sh7705_cache_init(void);
 286
 287                         sh7705_cache_init();
 288                 }
 289         }
 290
 291         if ((boot_cpu_data.family == CPU_FAMILY_SH4) ||
 292             (boot_cpu_data.family == CPU_FAMILY_SH4A) ||
 293             (boot_cpu_data.family == CPU_FAMILY_SH4AL_DSP)) {
 294                 extern void __weak sh4_cache_init(void);
 295
 296                 sh4_cache_init();
 297         }
 298
 299         if (boot_cpu_data.family == CPU_FAMILY_SH5) {
 300                 extern void __weak sh5_cache_init(void);
 301
 302                 sh5_cache_init();
 303         }
 304
 305         emit_cache_params();
 306 }