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_mapped(page) &&
  63             !test_bit(PG_dcache_dirty, &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                         set_bit(PG_dcache_dirty, &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_mapped(page) &&
  82             !test_bit(PG_dcache_dirty, &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                         set_bit(PG_dcache_dirty, &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, KM_USER1);
  99
 100         if (boot_cpu_data.dcache.n_aliases && page_mapped(from) &&
 101             !test_bit(PG_dcache_dirty, &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                 __flush_purge_region(vto, PAGE_SIZE);
 113
 114         kunmap_atomic(vto, KM_USER1);
 115         /* Make sure this page is cleared on other CPU's too before using it */
 116         smp_wmb();
 117 }
 118 EXPORT_SYMBOL(copy_user_highpage);
 119
 120 void clear_user_highpage(struct page *page, unsigned long vaddr)
 121 {
 122         void *kaddr = kmap_atomic(page, KM_USER0);
 123
 124         clear_page(kaddr);
 125
 126         if (pages_do_alias((unsigned long)kaddr, vaddr & PAGE_MASK))
 127                 __flush_purge_region(kaddr, PAGE_SIZE);
 128
 129         kunmap_atomic(kaddr, KM_USER0);
 130 }
 131 EXPORT_SYMBOL(clear_user_highpage);
 132
 133 void __update_cache(struct vm_area_struct *vma,
 134                     unsigned long address, pte_t pte)
 135 {
 136         struct page *page;
 137         unsigned long pfn = pte_pfn(pte);
 138
 139         if (!boot_cpu_data.dcache.n_aliases)
 140                 return;
 141
 142         page = pfn_to_page(pfn);
 143         if (pfn_valid(pfn)) {
 144                 int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
 145                 if (dirty)
 146                         __flush_purge_region(page_address(page), PAGE_SIZE);
 147         }
 148 }
 149
 150 void __flush_anon_page(struct page *page, unsigned long vmaddr)
 151 {
 152         unsigned long addr = (unsigned long) page_address(page);
 153
 154         if (pages_do_alias(addr, vmaddr)) {
 155                 if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
 156                     !test_bit(PG_dcache_dirty, &page->flags)) {
 157                         void *kaddr;
 158
 159                         kaddr = kmap_coherent(page, vmaddr);
 160                         /* XXX.. For now kunmap_coherent() does a purge */
 161                         /* __flush_purge_region((void *)kaddr, PAGE_SIZE); */
 162                         kunmap_coherent(kaddr);
 163                 } else
 164                         __flush_purge_region((void *)addr, PAGE_SIZE);
 165         }
 166 }
 167
 168 void flush_cache_all(void)
 169 {
 170         cacheop_on_each_cpu(local_flush_cache_all, NULL, 1);
 171 }
 172 EXPORT_SYMBOL(flush_cache_all);
 173
 174 void flush_cache_mm(struct mm_struct *mm)
 175 {
 176         if (boot_cpu_data.dcache.n_aliases == 0)
 177                 return;
 178
 179         cacheop_on_each_cpu(local_flush_cache_mm, mm, 1);
 180 }
 181
 182 void flush_cache_dup_mm(struct mm_struct *mm)
 183 {
 184         if (boot_cpu_data.dcache.n_aliases == 0)
 185                 return;
 186
 187         cacheop_on_each_cpu(local_flush_cache_dup_mm, mm, 1);
 188 }
 189
 190 void flush_cache_page(struct vm_area_struct *vma, unsigned long addr,
 191                       unsigned long pfn)
 192 {
 193         struct flusher_data data;
 194
 195         data.vma = vma;
 196         data.addr1 = addr;
 197         data.addr2 = pfn;
 198
 199         cacheop_on_each_cpu(local_flush_cache_page, (void *)&data, 1);
 200 }
 201
 202 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
 203                        unsigned long end)
 204 {
 205         struct flusher_data data;
 206
 207         data.vma = vma;
 208         data.addr1 = start;
 209         data.addr2 = end;
 210
 211         cacheop_on_each_cpu(local_flush_cache_range, (void *)&data, 1);
 212 }
 213 EXPORT_SYMBOL(flush_cache_range);
 214
 215 void flush_dcache_page(struct page *page)
 216 {
 217         cacheop_on_each_cpu(local_flush_dcache_page, page, 1);
 218 }
 219 EXPORT_SYMBOL(flush_dcache_page);
 220
 221 void flush_icache_range(unsigned long start, unsigned long end)
 222 {
 223         struct flusher_data data;
 224
 225         data.vma = NULL;
 226         data.addr1 = start;
 227         data.addr2 = end;
 228
 229         cacheop_on_each_cpu(local_flush_icache_range, (void *)&data, 1);
 230 }
 231
 232 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
 233 {
 234         /* Nothing uses the VMA, so just pass the struct page along */
 235         cacheop_on_each_cpu(local_flush_icache_page, page, 1);
 236 }
 237
 238 void flush_cache_sigtramp(unsigned long address)
 239 {
 240         cacheop_on_each_cpu(local_flush_cache_sigtramp, (void *)address, 1);
 241 }
 242
 243 static void compute_alias(struct cache_info *c)
 244 {
 245         c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
 246         c->n_aliases = c->alias_mask ? (c->alias_mask >> PAGE_SHIFT) + 1 : 0;
 247 }
 248
 249 static void __init emit_cache_params(void)
 250 {
 251         printk(KERN_NOTICE "I-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 252                 boot_cpu_data.icache.ways,
 253                 boot_cpu_data.icache.sets,
 254                 boot_cpu_data.icache.way_incr);
 255         printk(KERN_NOTICE "I-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 256                 boot_cpu_data.icache.entry_mask,
 257                 boot_cpu_data.icache.alias_mask,
 258                 boot_cpu_data.icache.n_aliases);
 259         printk(KERN_NOTICE "D-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 260                 boot_cpu_data.dcache.ways,
 261                 boot_cpu_data.dcache.sets,
 262                 boot_cpu_data.dcache.way_incr);
 263         printk(KERN_NOTICE "D-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 264                 boot_cpu_data.dcache.entry_mask,
 265                 boot_cpu_data.dcache.alias_mask,
 266                 boot_cpu_data.dcache.n_aliases);
 267
 268         /*
 269          * Emit Secondary Cache parameters if the CPU has a probed L2.
 270          */
 271         if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
 272                 printk(KERN_NOTICE "S-cache : n_ways=%d n_sets=%d way_incr=%d\n",
 273                         boot_cpu_data.scache.ways,
 274                         boot_cpu_data.scache.sets,
 275                         boot_cpu_data.scache.way_incr);
 276                 printk(KERN_NOTICE "S-cache : entry_mask=0x%08x alias_mask=0x%08x n_aliases=%d\n",
 277                         boot_cpu_data.scache.entry_mask,
 278                         boot_cpu_data.scache.alias_mask,
 279                         boot_cpu_data.scache.n_aliases);
 280         }
 281 }
 282
 283 void __init cpu_cache_init(void)
 284 {
 285         unsigned int cache_disabled = 0;
 286
 287 #ifdef CCR
 288         cache_disabled = !(__raw_readl(CCR) & CCR_CACHE_ENABLE);
 289 #endif
 290
 291         compute_alias(&boot_cpu_data.icache);
 292         compute_alias(&boot_cpu_data.dcache);
 293         compute_alias(&boot_cpu_data.scache);
 294
 295         __flush_wback_region            = noop__flush_region;
 296         __flush_purge_region            = noop__flush_region;
 297         __flush_invalidate_region       = noop__flush_region;
 298
 299         /*
 300          * No flushing is necessary in the disabled cache case so we can
 301          * just keep the noop functions in local_flush_..() and __flush_..()
 302          */
 303         if (unlikely(cache_disabled))
 304                 goto skip;
 305
 306         if (boot_cpu_data.family == CPU_FAMILY_SH2) {
 307                 extern void __weak sh2_cache_init(void);
 308
 309                 sh2_cache_init();
 310         }
 311
 312         if (boot_cpu_data.family == CPU_FAMILY_SH2A) {
 313                 extern void __weak sh2a_cache_init(void);
 314
 315                 sh2a_cache_init();
 316         }
 317
 318         if (boot_cpu_data.family == CPU_FAMILY_SH3) {
 319                 extern void __weak sh3_cache_init(void);
 320
 321                 sh3_cache_init();
 322
 323                 if ((boot_cpu_data.type == CPU_SH7705) &&
 324                     (boot_cpu_data.dcache.sets == 512)) {
 325                         extern void __weak sh7705_cache_init(void);
 326
 327                         sh7705_cache_init();
 328                 }
 329         }
 330
 331         if ((boot_cpu_data.family == CPU_FAMILY_SH4) ||
 332             (boot_cpu_data.family == CPU_FAMILY_SH4A) ||
 333             (boot_cpu_data.family == CPU_FAMILY_SH4AL_DSP)) {
 334                 extern void __weak sh4_cache_init(void);
 335
 336                 sh4_cache_init();
 337         }
 338
 339         if (boot_cpu_data.family == CPU_FAMILY_SH5) {
 340                 extern void __weak sh5_cache_init(void);
 341
 342                 sh5_cache_init();
 343         }
 344
 345 skip:
 346         emit_cache_params();
 347 }