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_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_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 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_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); 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_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 } 168 169 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 } 357