root/arch/parisc/kernel/cache.c

DEFINITIONS

1. flush_data_cache
2. flush_instruction_cache
3. flush_cache_all_local
4. update_mmu_cache
5. show_cache_info
6. parisc_cache_init
7. disable_sr_hashing
8. __flush_cache_page
9. __purge_cache_page
10. flush_dcache_page
11. parisc_setup_cache_timing
12. flush_kernel_dcache_page_addr
13. copy_user_page
14. __flush_tlb_range
15. cacheflush_h_tmp_function
16. flush_cache_all
17. mm_total_size
18. get_ptep
19. flush_cache_mm
20. flush_cache_range
21. flush_cache_page
22. flush_kernel_vmap_range
23. invalidate_kernel_vmap_range

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1999-2006 Helge Deller <deller@gmx.de> (07-13-1999)
   7  * Copyright (C) 1999 SuSE GmbH Nuernberg
   8  * Copyright (C) 2000 Philipp Rumpf (prumpf@tux.org)
   9  *
  10  * Cache and TLB management
  11  *
  12  */
  13  
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/mm.h>
  17 #include <linux/module.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/pagemap.h>
  20 #include <linux/sched.h>
  21 #include <linux/sched/mm.h>
  22 #include <asm/pdc.h>
  23 #include <asm/cache.h>
  24 #include <asm/cacheflush.h>
  25 #include <asm/tlbflush.h>
  26 #include <asm/page.h>
  27 #include <asm/pgalloc.h>
  28 #include <asm/processor.h>
  29 #include <asm/sections.h>
  30 #include <asm/shmparam.h>
  31 
  32 int split_tlb __ro_after_init;
  33 int dcache_stride __ro_after_init;
  34 int icache_stride __ro_after_init;
  35 EXPORT_SYMBOL(dcache_stride);
  36 
  37 void flush_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);
  38 EXPORT_SYMBOL(flush_dcache_page_asm);
  39 void purge_dcache_page_asm(unsigned long phys_addr, unsigned long vaddr);
  40 void flush_icache_page_asm(unsigned long phys_addr, unsigned long vaddr);
  41 
  42 
  43 /* On some machines (i.e., ones with the Merced bus), there can be
  44  * only a single PxTLB broadcast at a time; this must be guaranteed
  45  * by software. We need a spinlock around all TLB flushes to ensure
  46  * this.
  47  */
  48 DEFINE_SPINLOCK(pa_tlb_flush_lock);
  49 
  50 /* Swapper page setup lock. */
  51 DEFINE_SPINLOCK(pa_swapper_pg_lock);
  52 
  53 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
  54 int pa_serialize_tlb_flushes __ro_after_init;
  55 #endif
  56 
  57 struct pdc_cache_info cache_info __ro_after_init;
  58 #ifndef CONFIG_PA20
  59 static struct pdc_btlb_info btlb_info __ro_after_init;
  60 #endif
  61 
  62 #ifdef CONFIG_SMP
  63 void
  64 flush_data_cache(void)
  65 {
  66         on_each_cpu(flush_data_cache_local, NULL, 1);
  67 }
  68 void 
  69 flush_instruction_cache(void)
  70 {
  71         on_each_cpu(flush_instruction_cache_local, NULL, 1);
  72 }
  73 #endif
  74 
  75 void
  76 flush_cache_all_local(void)
  77 {
  78         flush_instruction_cache_local(NULL);
  79         flush_data_cache_local(NULL);
  80 }
  81 EXPORT_SYMBOL(flush_cache_all_local);
  82 
  83 /* Virtual address of pfn.  */
  84 #define pfn_va(pfn)     __va(PFN_PHYS(pfn))
  85 
  86 void
  87 update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
  88 {
  89         unsigned long pfn = pte_pfn(*ptep);
  90         struct page *page;
  91 
  92         /* We don't have pte special.  As a result, we can be called with
  93            an invalid pfn and we don't need to flush the kernel dcache page.
  94            This occurs with FireGL card in C8000.  */
  95         if (!pfn_valid(pfn))
  96                 return;
  97 
  98         page = pfn_to_page(pfn);
  99         if (page_mapping_file(page) &&
 100             test_bit(PG_dcache_dirty, &page->flags)) {
 101                 flush_kernel_dcache_page_addr(pfn_va(pfn));
 102                 clear_bit(PG_dcache_dirty, &page->flags);
 103         } else if (parisc_requires_coherency())
 104                 flush_kernel_dcache_page_addr(pfn_va(pfn));
 105 }
 106 
 107 void
 108 show_cache_info(struct seq_file *m)
 109 {
 110         char buf[32];
 111 
 112         seq_printf(m, "I-cache\t\t: %ld KB\n", 
 113                 cache_info.ic_size/1024 );
 114         if (cache_info.dc_loop != 1)
 115                 snprintf(buf, 32, "%lu-way associative", cache_info.dc_loop);
 116         seq_printf(m, "D-cache\t\t: %ld KB (%s%s, %s)\n",
 117                 cache_info.dc_size/1024,
 118                 (cache_info.dc_conf.cc_wt ? "WT":"WB"),
 119                 (cache_info.dc_conf.cc_sh ? ", shared I/D":""),
 120                 ((cache_info.dc_loop == 1) ? "direct mapped" : buf));
 121         seq_printf(m, "ITLB entries\t: %ld\n" "DTLB entries\t: %ld%s\n",
 122                 cache_info.it_size,
 123                 cache_info.dt_size,
 124                 cache_info.dt_conf.tc_sh ? " - shared with ITLB":""
 125         );
 126                 
 127 #ifndef CONFIG_PA20
 128         /* BTLB - Block TLB */
 129         if (btlb_info.max_size==0) {
 130                 seq_printf(m, "BTLB\t\t: not supported\n" );
 131         } else {
 132                 seq_printf(m, 
 133                 "BTLB fixed\t: max. %d pages, pagesize=%d (%dMB)\n"
 134                 "BTLB fix-entr.\t: %d instruction, %d data (%d combined)\n"
 135                 "BTLB var-entr.\t: %d instruction, %d data (%d combined)\n",
 136                 btlb_info.max_size, (int)4096,
 137                 btlb_info.max_size>>8,
 138                 btlb_info.fixed_range_info.num_i,
 139                 btlb_info.fixed_range_info.num_d,
 140                 btlb_info.fixed_range_info.num_comb, 
 141                 btlb_info.variable_range_info.num_i,
 142                 btlb_info.variable_range_info.num_d,
 143                 btlb_info.variable_range_info.num_comb
 144                 );
 145         }
 146 #endif
 147 }
 148 
 149 void __init 
 150 parisc_cache_init(void)
 151 {
 152         if (pdc_cache_info(&cache_info) < 0)
 153                 panic("parisc_cache_init: pdc_cache_info failed");
 154 
 155 #if 0
 156         printk("ic_size %lx dc_size %lx it_size %lx\n",
 157                 cache_info.ic_size,
 158                 cache_info.dc_size,
 159                 cache_info.it_size);
 160 
 161         printk("DC  base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n",
 162                 cache_info.dc_base,
 163                 cache_info.dc_stride,
 164                 cache_info.dc_count,
 165                 cache_info.dc_loop);
 166 
 167         printk("dc_conf = 0x%lx  alias %d blk %d line %d shift %d\n",
 168                 *(unsigned long *) (&cache_info.dc_conf),
 169                 cache_info.dc_conf.cc_alias,
 170                 cache_info.dc_conf.cc_block,
 171                 cache_info.dc_conf.cc_line,
 172                 cache_info.dc_conf.cc_shift);
 173         printk("        wt %d sh %d cst %d hv %d\n",
 174                 cache_info.dc_conf.cc_wt,
 175                 cache_info.dc_conf.cc_sh,
 176                 cache_info.dc_conf.cc_cst,
 177                 cache_info.dc_conf.cc_hv);
 178 
 179         printk("IC  base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n",
 180                 cache_info.ic_base,
 181                 cache_info.ic_stride,
 182                 cache_info.ic_count,
 183                 cache_info.ic_loop);
 184 
 185         printk("IT  base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx off_base 0x%lx off_stride 0x%lx off_count 0x%lx\n",
 186                 cache_info.it_sp_base,
 187                 cache_info.it_sp_stride,
 188                 cache_info.it_sp_count,
 189                 cache_info.it_loop,
 190                 cache_info.it_off_base,
 191                 cache_info.it_off_stride,
 192                 cache_info.it_off_count);
 193 
 194         printk("DT  base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx off_base 0x%lx off_stride 0x%lx off_count 0x%lx\n",
 195                 cache_info.dt_sp_base,
 196                 cache_info.dt_sp_stride,
 197                 cache_info.dt_sp_count,
 198                 cache_info.dt_loop,
 199                 cache_info.dt_off_base,
 200                 cache_info.dt_off_stride,
 201                 cache_info.dt_off_count);
 202 
 203         printk("ic_conf = 0x%lx  alias %d blk %d line %d shift %d\n",
 204                 *(unsigned long *) (&cache_info.ic_conf),
 205                 cache_info.ic_conf.cc_alias,
 206                 cache_info.ic_conf.cc_block,
 207                 cache_info.ic_conf.cc_line,
 208                 cache_info.ic_conf.cc_shift);
 209         printk("        wt %d sh %d cst %d hv %d\n",
 210                 cache_info.ic_conf.cc_wt,
 211                 cache_info.ic_conf.cc_sh,
 212                 cache_info.ic_conf.cc_cst,
 213                 cache_info.ic_conf.cc_hv);
 214 
 215         printk("D-TLB conf: sh %d page %d cst %d aid %d sr %d\n",
 216                 cache_info.dt_conf.tc_sh,
 217                 cache_info.dt_conf.tc_page,
 218                 cache_info.dt_conf.tc_cst,
 219                 cache_info.dt_conf.tc_aid,
 220                 cache_info.dt_conf.tc_sr);
 221 
 222         printk("I-TLB conf: sh %d page %d cst %d aid %d sr %d\n",
 223                 cache_info.it_conf.tc_sh,
 224                 cache_info.it_conf.tc_page,
 225                 cache_info.it_conf.tc_cst,
 226                 cache_info.it_conf.tc_aid,
 227                 cache_info.it_conf.tc_sr);
 228 #endif
 229 
 230         split_tlb = 0;
 231         if (cache_info.dt_conf.tc_sh == 0 || cache_info.dt_conf.tc_sh == 2) {
 232                 if (cache_info.dt_conf.tc_sh == 2)
 233                         printk(KERN_WARNING "Unexpected TLB configuration. "
 234                         "Will flush I/D separately (could be optimized).\n");
 235 
 236                 split_tlb = 1;
 237         }
 238 
 239         /* "New and Improved" version from Jim Hull 
 240          *      (1 << (cc_block-1)) * (cc_line << (4 + cnf.cc_shift))
 241          * The following CAFL_STRIDE is an optimized version, see
 242          * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023625.html
 243          * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023671.html
 244          */
 245 #define CAFL_STRIDE(cnf) (cnf.cc_line << (3 + cnf.cc_block + cnf.cc_shift))
 246         dcache_stride = CAFL_STRIDE(cache_info.dc_conf);
 247         icache_stride = CAFL_STRIDE(cache_info.ic_conf);
 248 #undef CAFL_STRIDE
 249 
 250 #ifndef CONFIG_PA20
 251         if (pdc_btlb_info(&btlb_info) < 0) {
 252                 memset(&btlb_info, 0, sizeof btlb_info);
 253         }
 254 #endif
 255 
 256         if ((boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) ==
 257                                                 PDC_MODEL_NVA_UNSUPPORTED) {
 258                 printk(KERN_WARNING "parisc_cache_init: Only equivalent aliasing supported!\n");
 259 #if 0
 260                 panic("SMP kernel required to avoid non-equivalent aliasing");
 261 #endif
 262         }
 263 }
 264 
 265 void __init disable_sr_hashing(void)
 266 {
 267         int srhash_type, retval;
 268         unsigned long space_bits;
 269 
 270         switch (boot_cpu_data.cpu_type) {
 271         case pcx: /* We shouldn't get this far.  setup.c should prevent it. */
 272                 BUG();
 273                 return;
 274 
 275         case pcxs:
 276         case pcxt:
 277         case pcxt_:
 278                 srhash_type = SRHASH_PCXST;
 279                 break;
 280 
 281         case pcxl:
 282                 srhash_type = SRHASH_PCXL;
 283                 break;
 284 
 285         case pcxl2: /* pcxl2 doesn't support space register hashing */
 286                 return;
 287 
 288         default: /* Currently all PA2.0 machines use the same ins. sequence */
 289                 srhash_type = SRHASH_PA20;
 290                 break;
 291         }
 292 
 293         disable_sr_hashing_asm(srhash_type);
 294 
 295         retval = pdc_spaceid_bits(&space_bits);
 296         /* If this procedure isn't implemented, don't panic. */
 297         if (retval < 0 && retval != PDC_BAD_OPTION)
 298                 panic("pdc_spaceid_bits call failed.\n");
 299         if (space_bits != 0)
 300                 panic("SpaceID hashing is still on!\n");
 301 }
 302 
 303 static inline void
 304 __flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
 305                    unsigned long physaddr)
 306 {
 307         preempt_disable();
 308         flush_dcache_page_asm(physaddr, vmaddr);
 309         if (vma->vm_flags & VM_EXEC)
 310                 flush_icache_page_asm(physaddr, vmaddr);
 311         preempt_enable();
 312 }
 313 
 314 static inline void
 315 __purge_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
 316                    unsigned long physaddr)
 317 {
 318         preempt_disable();
 319         purge_dcache_page_asm(physaddr, vmaddr);
 320         if (vma->vm_flags & VM_EXEC)
 321                 flush_icache_page_asm(physaddr, vmaddr);
 322         preempt_enable();
 323 }
 324 
 325 void flush_dcache_page(struct page *page)
 326 {
 327         struct address_space *mapping = page_mapping_file(page);
 328         struct vm_area_struct *mpnt;
 329         unsigned long offset;
 330         unsigned long addr, old_addr = 0;
 331         pgoff_t pgoff;
 332 
 333         if (mapping && !mapping_mapped(mapping)) {
 334                 set_bit(PG_dcache_dirty, &page->flags);
 335                 return;
 336         }
 337 
 338         flush_kernel_dcache_page(page);
 339 
 340         if (!mapping)
 341                 return;
 342 
 343         pgoff = page->index;
 344 
 345         /* We have carefully arranged in arch_get_unmapped_area() that
 346          * *any* mappings of a file are always congruently mapped (whether
 347          * declared as MAP_PRIVATE or MAP_SHARED), so we only need
 348          * to flush one address here for them all to become coherent */
 349 
 350         flush_dcache_mmap_lock(mapping);
 351         vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) {
 352                 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
 353                 addr = mpnt->vm_start + offset;
 354 
 355                 /* The TLB is the engine of coherence on parisc: The
 356                  * CPU is entitled to speculate any page with a TLB
 357                  * mapping, so here we kill the mapping then flush the
 358                  * page along a special flush only alias mapping.
 359                  * This guarantees that the page is no-longer in the
 360                  * cache for any process and nor may it be
 361                  * speculatively read in (until the user or kernel
 362                  * specifically accesses it, of course) */
 363 
 364                 flush_tlb_page(mpnt, addr);
 365                 if (old_addr == 0 || (old_addr & (SHM_COLOUR - 1))
 366                                       != (addr & (SHM_COLOUR - 1))) {
 367                         __flush_cache_page(mpnt, addr, page_to_phys(page));
 368                         if (old_addr)
 369                                 printk(KERN_ERR "INEQUIVALENT ALIASES 0x%lx and 0x%lx in file %pD\n", old_addr, addr, mpnt->vm_file);
 370                         old_addr = addr;
 371                 }
 372         }
 373         flush_dcache_mmap_unlock(mapping);
 374 }
 375 EXPORT_SYMBOL(flush_dcache_page);
 376 
 377 /* Defined in arch/parisc/kernel/pacache.S */
 378 EXPORT_SYMBOL(flush_kernel_dcache_range_asm);
 379 EXPORT_SYMBOL(flush_kernel_dcache_page_asm);
 380 EXPORT_SYMBOL(flush_data_cache_local);
 381 EXPORT_SYMBOL(flush_kernel_icache_range_asm);
 382 
 383 #define FLUSH_THRESHOLD 0x80000 /* 0.5MB */
 384 static unsigned long parisc_cache_flush_threshold __ro_after_init = FLUSH_THRESHOLD;
 385 
 386 #define FLUSH_TLB_THRESHOLD (16*1024) /* 16 KiB minimum TLB threshold */
 387 static unsigned long parisc_tlb_flush_threshold __ro_after_init = FLUSH_TLB_THRESHOLD;
 388 
 389 void __init parisc_setup_cache_timing(void)
 390 {
 391         unsigned long rangetime, alltime;
 392         unsigned long size, start;
 393         unsigned long threshold;
 394 
 395         alltime = mfctl(16);
 396         flush_data_cache();
 397         alltime = mfctl(16) - alltime;
 398 
 399         size = (unsigned long)(_end - _text);
 400         rangetime = mfctl(16);
 401         flush_kernel_dcache_range((unsigned long)_text, size);
 402         rangetime = mfctl(16) - rangetime;
 403 
 404         printk(KERN_DEBUG "Whole cache flush %lu cycles, flushing %lu bytes %lu cycles\n",
 405                 alltime, size, rangetime);
 406 
 407         threshold = L1_CACHE_ALIGN(size * alltime / rangetime);
 408         if (threshold > cache_info.dc_size)
 409                 threshold = cache_info.dc_size;
 410         if (threshold)
 411                 parisc_cache_flush_threshold = threshold;
 412         printk(KERN_INFO "Cache flush threshold set to %lu KiB\n",
 413                 parisc_cache_flush_threshold/1024);
 414 
 415         /* calculate TLB flush threshold */
 416 
 417         /* On SMP machines, skip the TLB measure of kernel text which
 418          * has been mapped as huge pages. */
 419         if (num_online_cpus() > 1 && !parisc_requires_coherency()) {
 420                 threshold = max(cache_info.it_size, cache_info.dt_size);
 421                 threshold *= PAGE_SIZE;
 422                 threshold /= num_online_cpus();
 423                 goto set_tlb_threshold;
 424         }
 425 
 426         size = 0;
 427         start = (unsigned long) _text;
 428         rangetime = mfctl(16);
 429         while (start < (unsigned long) _end) {
 430                 flush_tlb_kernel_range(start, start + PAGE_SIZE);
 431                 start += PAGE_SIZE;
 432                 size += PAGE_SIZE;
 433         }
 434         rangetime = mfctl(16) - rangetime;
 435 
 436         alltime = mfctl(16);
 437         flush_tlb_all();
 438         alltime = mfctl(16) - alltime;
 439 
 440         printk(KERN_INFO "Whole TLB flush %lu cycles, Range flush %lu bytes %lu cycles\n",
 441                 alltime, size, rangetime);
 442 
 443         threshold = PAGE_ALIGN((num_online_cpus() * size * alltime) / rangetime);
 444         printk(KERN_INFO "Calculated TLB flush threshold %lu KiB\n",
 445                 threshold/1024);
 446 
 447 set_tlb_threshold:
 448         if (threshold > parisc_tlb_flush_threshold)
 449                 parisc_tlb_flush_threshold = threshold;
 450         printk(KERN_INFO "TLB flush threshold set to %lu KiB\n",
 451                 parisc_tlb_flush_threshold/1024);
 452 }
 453 
 454 extern void purge_kernel_dcache_page_asm(unsigned long);
 455 extern void clear_user_page_asm(void *, unsigned long);
 456 extern void copy_user_page_asm(void *, void *, unsigned long);
 457 
 458 void flush_kernel_dcache_page_addr(void *addr)
 459 {
 460         unsigned long flags;
 461 
 462         flush_kernel_dcache_page_asm(addr);
 463         purge_tlb_start(flags);
 464         pdtlb_kernel(addr);
 465         purge_tlb_end(flags);
 466 }
 467 EXPORT_SYMBOL(flush_kernel_dcache_page_addr);
 468 
 469 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
 470         struct page *pg)
 471 {
 472        /* Copy using kernel mapping.  No coherency is needed (all in
 473           kunmap) for the `to' page.  However, the `from' page needs to
 474           be flushed through a mapping equivalent to the user mapping
 475           before it can be accessed through the kernel mapping. */
 476         preempt_disable();
 477         flush_dcache_page_asm(__pa(vfrom), vaddr);
 478         copy_page_asm(vto, vfrom);
 479         preempt_enable();
 480 }
 481 EXPORT_SYMBOL(copy_user_page);
 482 
 483 /* __flush_tlb_range()
 484  *
 485  * returns 1 if all TLBs were flushed.
 486  */
 487 int __flush_tlb_range(unsigned long sid, unsigned long start,
 488                       unsigned long end)
 489 {
 490         unsigned long flags;
 491 
 492         if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
 493             end - start >= parisc_tlb_flush_threshold) {
 494                 flush_tlb_all();
 495                 return 1;
 496         }
 497 
 498         /* Purge TLB entries for small ranges using the pdtlb and
 499            pitlb instructions.  These instructions execute locally
 500            but cause a purge request to be broadcast to other TLBs.  */
 501         while (start < end) {
 502                 purge_tlb_start(flags);
 503                 mtsp(sid, 1);
 504                 pdtlb(start);
 505                 pitlb(start);
 506                 purge_tlb_end(flags);
 507                 start += PAGE_SIZE;
 508         }
 509         return 0;
 510 }
 511 
 512 static void cacheflush_h_tmp_function(void *dummy)
 513 {
 514         flush_cache_all_local();
 515 }
 516 
 517 void flush_cache_all(void)
 518 {
 519         on_each_cpu(cacheflush_h_tmp_function, NULL, 1);
 520 }
 521 
 522 static inline unsigned long mm_total_size(struct mm_struct *mm)
 523 {
 524         struct vm_area_struct *vma;
 525         unsigned long usize = 0;
 526 
 527         for (vma = mm->mmap; vma; vma = vma->vm_next)
 528                 usize += vma->vm_end - vma->vm_start;
 529         return usize;
 530 }
 531 
 532 static inline pte_t *get_ptep(pgd_t *pgd, unsigned long addr)
 533 {
 534         pte_t *ptep = NULL;
 535 
 536         if (!pgd_none(*pgd)) {
 537                 pud_t *pud = pud_offset(pgd, addr);
 538                 if (!pud_none(*pud)) {
 539                         pmd_t *pmd = pmd_offset(pud, addr);
 540                         if (!pmd_none(*pmd))
 541                                 ptep = pte_offset_map(pmd, addr);
 542                 }
 543         }
 544         return ptep;
 545 }
 546 
 547 void flush_cache_mm(struct mm_struct *mm)
 548 {
 549         struct vm_area_struct *vma;
 550         pgd_t *pgd;
 551 
 552         /* Flushing the whole cache on each cpu takes forever on
 553            rp3440, etc.  So, avoid it if the mm isn't too big.  */
 554         if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
 555             mm_total_size(mm) >= parisc_cache_flush_threshold) {
 556                 if (mm->context)
 557                         flush_tlb_all();
 558                 flush_cache_all();
 559                 return;
 560         }
 561 
 562         if (mm->context == mfsp(3)) {
 563                 for (vma = mm->mmap; vma; vma = vma->vm_next) {
 564                         flush_user_dcache_range_asm(vma->vm_start, vma->vm_end);
 565                         if (vma->vm_flags & VM_EXEC)
 566                                 flush_user_icache_range_asm(vma->vm_start, vma->vm_end);
 567                         flush_tlb_range(vma, vma->vm_start, vma->vm_end);
 568                 }
 569                 return;
 570         }
 571 
 572         pgd = mm->pgd;
 573         for (vma = mm->mmap; vma; vma = vma->vm_next) {
 574                 unsigned long addr;
 575 
 576                 for (addr = vma->vm_start; addr < vma->vm_end;
 577                      addr += PAGE_SIZE) {
 578                         unsigned long pfn;
 579                         pte_t *ptep = get_ptep(pgd, addr);
 580                         if (!ptep)
 581                                 continue;
 582                         pfn = pte_pfn(*ptep);
 583                         if (!pfn_valid(pfn))
 584                                 continue;
 585                         if (unlikely(mm->context)) {
 586                                 flush_tlb_page(vma, addr);
 587                                 __flush_cache_page(vma, addr, PFN_PHYS(pfn));
 588                         } else {
 589                                 __purge_cache_page(vma, addr, PFN_PHYS(pfn));
 590                         }
 591                 }
 592         }
 593 }
 594 
 595 void flush_cache_range(struct vm_area_struct *vma,
 596                 unsigned long start, unsigned long end)
 597 {
 598         pgd_t *pgd;
 599         unsigned long addr;
 600 
 601         if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
 602             end - start >= parisc_cache_flush_threshold) {
 603                 if (vma->vm_mm->context)
 604                         flush_tlb_range(vma, start, end);
 605                 flush_cache_all();
 606                 return;
 607         }
 608 
 609         if (vma->vm_mm->context == mfsp(3)) {
 610                 flush_user_dcache_range_asm(start, end);
 611                 if (vma->vm_flags & VM_EXEC)
 612                         flush_user_icache_range_asm(start, end);
 613                 flush_tlb_range(vma, start, end);
 614                 return;
 615         }
 616 
 617         pgd = vma->vm_mm->pgd;
 618         for (addr = vma->vm_start; addr < vma->vm_end; addr += PAGE_SIZE) {
 619                 unsigned long pfn;
 620                 pte_t *ptep = get_ptep(pgd, addr);
 621                 if (!ptep)
 622                         continue;
 623                 pfn = pte_pfn(*ptep);
 624                 if (pfn_valid(pfn)) {
 625                         if (unlikely(vma->vm_mm->context)) {
 626                                 flush_tlb_page(vma, addr);
 627                                 __flush_cache_page(vma, addr, PFN_PHYS(pfn));
 628                         } else {
 629                                 __purge_cache_page(vma, addr, PFN_PHYS(pfn));
 630                         }
 631                 }
 632         }
 633 }
 634 
 635 void
 636 flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
 637 {
 638         if (pfn_valid(pfn)) {
 639                 if (likely(vma->vm_mm->context)) {
 640                         flush_tlb_page(vma, vmaddr);
 641                         __flush_cache_page(vma, vmaddr, PFN_PHYS(pfn));
 642                 } else {
 643                         __purge_cache_page(vma, vmaddr, PFN_PHYS(pfn));
 644                 }
 645         }
 646 }
 647 
 648 void flush_kernel_vmap_range(void *vaddr, int size)
 649 {
 650         unsigned long start = (unsigned long)vaddr;
 651         unsigned long end = start + size;
 652 
 653         if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
 654             (unsigned long)size >= parisc_cache_flush_threshold) {
 655                 flush_tlb_kernel_range(start, end);
 656                 flush_data_cache();
 657                 return;
 658         }
 659 
 660         flush_kernel_dcache_range_asm(start, end);
 661         flush_tlb_kernel_range(start, end);
 662 }
 663 EXPORT_SYMBOL(flush_kernel_vmap_range);
 664 
 665 void invalidate_kernel_vmap_range(void *vaddr, int size)
 666 {
 667         unsigned long start = (unsigned long)vaddr;
 668         unsigned long end = start + size;
 669 
 670         if ((!IS_ENABLED(CONFIG_SMP) || !arch_irqs_disabled()) &&
 671             (unsigned long)size >= parisc_cache_flush_threshold) {
 672                 flush_tlb_kernel_range(start, end);
 673                 flush_data_cache();
 674                 return;
 675         }
 676 
 677         purge_kernel_dcache_range_asm(start, end);
 678         flush_tlb_kernel_range(start, end);
 679 }
 680 EXPORT_SYMBOL(invalidate_kernel_vmap_range);