arch/sh/mm/cache.c

   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
  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 EXPORT_SYMBOL(__flush_wback_region);
  31 void (*__flush_purge_region)(void *start, int size);
  32 EXPORT_SYMBOL(__flush_purge_region);
  33 void (*__flush_invalidate_region)(void *start, int size);
  34 EXPORT_SYMBOL(__flush_invalidate_region);
  35
  36 static inline void noop__flush_region(void *start, int size)
  37 {
  38 }
  39
  40 static 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
  58 void 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_mapcount(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
  77 void 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_mapcount(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
  93 void 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);
  99
 100         if (boot_cpu_data.dcache.n_aliases && page_mapcount(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);
 107                 copy_page(vto, vfrom);
 108                 kunmap_atomic(vfrom);
 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);
 116         /* Make sure this page is cleared on other CPU's too before using it */
 117         smp_wmb();
 118 }
 119 EXPORT_SYMBOL(copy_user_highpage);
 120
 121 void clear_user_highpage(struct page *page, unsigned long vaddr)
 122 {
 123         void *kaddr = kmap_atomic(page);
 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);
 131 }
 132 EXPORT_SYMBOL(clear_user_highpage);
 133
 134 void __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
 151 void __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_mapcount(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
 169 void flush_cache_all(void)
 170 {
 171         cacheop_on_each_cpu(local_flush_cache_all, NULL, 1);
 172 }
 173 EXPORT_SYMBOL(flush_cache_all);
 174
 175 void 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
 183 void 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
 191 void 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
 203 void 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 }
 214 EXPORT_SYMBOL(flush_cache_range);
 215
 216 void flush_dcache_page(struct page *page)
 217 {
 218         cacheop_on_each_cpu(local_flush_dcache_page, page, 1);
 219 }
 220 EXPORT_SYMBOL(flush_dcache_page);
 221
 222 void 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 EXPORT_SYMBOL(flush_icache_range);
 233
 234 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
 235 {
 236         /* Nothing uses the VMA, so just pass the struct page along */
 237         cacheop_on_each_cpu(local_flush_icache_page, page, 1);
 238 }
 239
 240 void flush_cache_sigtramp(unsigned long address)
 241 {
 242         cacheop_on_each_cpu(local_flush_cache_sigtramp, (void *)address, 1);
 243 }
 244
 245 static void compute_alias(struct cache_info *c)
 246 {
 247         c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
 248         c->n_aliases = c->alias_mask ? (c->alias_mask >> PAGE_SHIFT) + 1 : 0;
 249 }
 250
 251 static void __init emit_cache_params(void)
 252 {
 253         printk(KERN_NOTICE "I-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 254                 boot_cpu_data.icache.ways,
 255                 boot_cpu_data.icache.sets,
 256                 boot_cpu_data.icache.way_incr);
 257         printk(KERN_NOTICE "I-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 258                 boot_cpu_data.icache.entry_mask,
 259                 boot_cpu_data.icache.alias_mask,
 260                 boot_cpu_data.icache.n_aliases);
 261         printk(KERN_NOTICE "D-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 262                 boot_cpu_data.dcache.ways,
 263                 boot_cpu_data.dcache.sets,
 264                 boot_cpu_data.dcache.way_incr);
 265         printk(KERN_NOTICE "D-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 266                 boot_cpu_data.dcache.entry_mask,
 267                 boot_cpu_data.dcache.alias_mask,
 268                 boot_cpu_data.dcache.n_aliases);
 269
 270         /*
 271          * Emit Secondary Cache parameters if the CPU has a probed L2.
 272          */
 273         if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
 274                 printk(KERN_NOTICE "S-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 275                         boot_cpu_data.scache.ways,
 276                         boot_cpu_data.scache.sets,
 277                         boot_cpu_data.scache.way_incr);
 278                 printk(KERN_NOTICE "S-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 279                         boot_cpu_data.scache.entry_mask,
 280                         boot_cpu_data.scache.alias_mask,
 281                         boot_cpu_data.scache.n_aliases);
 282         }
 283 }
 284
 285 void __init cpu_cache_init(void)
 286 {
 287         unsigned int cache_disabled = 0;
 288
 289 #ifdef SH_CCR
 290         cache_disabled = !(__raw_readl(SH_CCR) & CCR_CACHE_ENABLE);
 291 #endif
 292
 293         compute_alias(&boot_cpu_data.icache);
 294         compute_alias(&boot_cpu_data.dcache);
 295         compute_alias(&boot_cpu_data.scache);
 296
 297         __flush_wback_region            = noop__flush_region;
 298         __flush_purge_region            = noop__flush_region;
 299         __flush_invalidate_region       = noop__flush_region;
 300
 301         /*
 302          * No flushing is necessary in the disabled cache case so we can
 303          * just keep the noop functions in local_flush_..() and __flush_..()
 304          */
 305         if (unlikely(cache_disabled))
 306                 goto skip;
 307
 308         if (boot_cpu_data.family == CPU_FAMILY_SH2) {
 309                 extern void __weak sh2_cache_init(void);
 310
 311                 sh2_cache_init();
 312         }
 313
 314         if (boot_cpu_data.family == CPU_FAMILY_SH2A) {
 315                 extern void __weak sh2a_cache_init(void);
 316
 317                 sh2a_cache_init();
 318         }
 319
 320         if (boot_cpu_data.family == CPU_FAMILY_SH3) {
 321                 extern void __weak sh3_cache_init(void);
 322
 323                 sh3_cache_init();
 324
 325                 if ((boot_cpu_data.type == CPU_SH7705) &&
 326                     (boot_cpu_data.dcache.sets == 512)) {
 327                         extern void __weak sh7705_cache_init(void);
 328
 329                         sh7705_cache_init();
 330                 }
 331         }
 332
 333         if ((boot_cpu_data.family == CPU_FAMILY_SH4) ||
 334             (boot_cpu_data.family == CPU_FAMILY_SH4A) ||
 335             (boot_cpu_data.family == CPU_FAMILY_SH4AL_DSP)) {
 336                 extern void __weak sh4_cache_init(void);
 337
 338                 sh4_cache_init();
 339
 340                 if ((boot_cpu_data.type == CPU_SH7786) ||
 341                     (boot_cpu_data.type == CPU_SHX3)) {
 342                         extern void __weak shx3_cache_init(void);
 343
 344                         shx3_cache_init();
 345                 }
 346         }
 347
 348         if (boot_cpu_data.family == CPU_FAMILY_SH5) {
 349                 extern void __weak sh5_cache_init(void);
 350
 351                 sh5_cache_init();
 352         }
 353
 354 skip:
 355         emit_cache_params();
 356 }