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   1 /* $Id: cache.c,v 1.4 2000/01/25 00:11:38 prumpf Exp $
   2  *
   3  * This file is subject to the terms and conditions of the GNU General Public
   4  * License.  See the file "COPYING" in the main directory of this archive
   5  * for more details.
   6  *
   7  * Copyright (C) 1999 Helge Deller (07-13-1999)
   8  * Copyright (C) 1999 SuSE GmbH Nuernberg
   9  * Copyright (C) 2000 Philipp Rumpf (prumpf@tux.org)
  10  *
  11  * Cache and TLB management
  12  *
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/mm.h>
  18 #include <linux/module.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/pagemap.h>
  21
  22 #include <asm/pdc.h>
  23 #include <asm/cache.h>
  24 #include <asm/cacheflush.h>
  25 #include <asm/tlbflush.h>
  26 #include <asm/system.h>
  27 #include <asm/page.h>
  28 #include <asm/pgalloc.h>
  29 #include <asm/processor.h>
  30 #include <asm/sections.h>
  31
  32 int split_tlb __read_mostly;
  33 int dcache_stride __read_mostly;
  34 int icache_stride __read_mostly;
  35 EXPORT_SYMBOL(dcache_stride);
  36
  37
  38 #if defined(CONFIG_SMP)
  39 /* On some machines (e.g. ones with the Merced bus), there can be
  40  * only a single PxTLB broadcast at a time; this must be guaranteed
  41  * by software.  We put a spinlock around all TLB flushes  to
  42  * ensure this.
  43  */
  44 DEFINE_SPINLOCK(pa_tlb_lock);
  45 EXPORT_SYMBOL(pa_tlb_lock);
  46 #endif
  47
  48 struct pdc_cache_info cache_info __read_mostly;
  49 #ifndef CONFIG_PA20
  50 static struct pdc_btlb_info btlb_info __read_mostly;
  51 #endif
  52
  53 #ifdef CONFIG_SMP
  54 void
  55 flush_data_cache(void)
  56 {
  57         on_each_cpu((void (*)(void *))flush_data_cache_local, NULL, 1, 1);
  58 }
  59 void
  60 flush_instruction_cache(void)
  61 {
  62         on_each_cpu((void (*)(void *))flush_instruction_cache_local, NULL, 1, 1);
  63 }
  64 #endif
  65
  66 void
  67 flush_cache_all_local(void)
  68 {
  69         flush_instruction_cache_local();
  70         flush_data_cache_local();
  71 }
  72 EXPORT_SYMBOL(flush_cache_all_local);
  73
  74 /* flushes EVERYTHING (tlb & cache) */
  75
  76 void
  77 flush_all_caches(void)
  78 {
  79         flush_cache_all();
  80         flush_tlb_all();
  81 }
  82 EXPORT_SYMBOL(flush_all_caches);
  83
  84 void
  85 update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
  86 {
  87         struct page *page = pte_page(pte);
  88
  89         if (pfn_valid(page_to_pfn(page)) && page_mapping(page) &&
  90             test_bit(PG_dcache_dirty, &page->flags)) {
  91
  92                 flush_kernel_dcache_page(page_address(page));
  93                 clear_bit(PG_dcache_dirty, &page->flags);
  94         }
  95 }
  96
  97 void
  98 show_cache_info(struct seq_file *m)
  99 {
 100         seq_printf(m, "I-cache\t\t: %ld KB\n",
 101                 cache_info.ic_size/1024 );
 102         seq_printf(m, "D-cache\t\t: %ld KB (%s%s, %d-way associative)\n",
 103                 cache_info.dc_size/1024,
 104                 (cache_info.dc_conf.cc_wt ? "WT":"WB"),
 105                 (cache_info.dc_conf.cc_sh ? ", shared I/D":""),
 106                 (cache_info.dc_conf.cc_assoc)
 107         );
 108
 109         seq_printf(m, "ITLB entries\t: %ld\n" "DTLB entries\t: %ld%s\n",
 110                 cache_info.it_size,
 111                 cache_info.dt_size,
 112                 cache_info.dt_conf.tc_sh ? " - shared with ITLB":""
 113         );
 114
 115 #ifndef CONFIG_PA20
 116         /* BTLB - Block TLB */
 117         if (btlb_info.max_size==0) {
 118                 seq_printf(m, "BTLB\t\t: not supported\n" );
 119         } else {
 120                 seq_printf(m,
 121                 "BTLB fixed\t: max. %d pages, pagesize=%d (%dMB)\n"
 122                 "BTLB fix-entr.\t: %d instruction, %d data (%d combined)\n"
 123                 "BTLB var-entr.\t: %d instruction, %d data (%d combined)\n",
 124                 btlb_info.max_size, (int)4096,
 125                 btlb_info.max_size>>8,
 126                 btlb_info.fixed_range_info.num_i,
 127                 btlb_info.fixed_range_info.num_d,
 128                 btlb_info.fixed_range_info.num_comb,
 129                 btlb_info.variable_range_info.num_i,
 130                 btlb_info.variable_range_info.num_d,
 131                 btlb_info.variable_range_info.num_comb
 132                 );
 133         }
 134 #endif
 135 }
 136
 137 void __init
 138 parisc_cache_init(void)
 139 {
 140         if (pdc_cache_info(&cache_info) < 0)
 141                 panic("parisc_cache_init: pdc_cache_info failed");
 142
 143 #if 0
 144         printk("ic_size %lx dc_size %lx it_size %lx\n",
 145                 cache_info.ic_size,
 146                 cache_info.dc_size,
 147                 cache_info.it_size);
 148
 149         printk("DC  base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n",
 150                 cache_info.dc_base,
 151                 cache_info.dc_stride,
 152                 cache_info.dc_count,
 153                 cache_info.dc_loop);
 154
 155         printk("dc_conf = 0x%lx  alias %d blk %d line %d shift %d\n",
 156                 *(unsigned long *) (&cache_info.dc_conf),
 157                 cache_info.dc_conf.cc_alias,
 158                 cache_info.dc_conf.cc_block,
 159                 cache_info.dc_conf.cc_line,
 160                 cache_info.dc_conf.cc_shift);
 161         printk("        wt %d sh %d cst %d assoc %d\n",
 162                 cache_info.dc_conf.cc_wt,
 163                 cache_info.dc_conf.cc_sh,
 164                 cache_info.dc_conf.cc_cst,
 165                 cache_info.dc_conf.cc_assoc);
 166
 167         printk("IC  base 0x%lx stride 0x%lx count 0x%lx loop 0x%lx\n",
 168                 cache_info.ic_base,
 169                 cache_info.ic_stride,
 170                 cache_info.ic_count,
 171                 cache_info.ic_loop);
 172
 173         printk("ic_conf = 0x%lx  alias %d blk %d line %d shift %d\n",
 174                 *(unsigned long *) (&cache_info.ic_conf),
 175                 cache_info.ic_conf.cc_alias,
 176                 cache_info.ic_conf.cc_block,
 177                 cache_info.ic_conf.cc_line,
 178                 cache_info.ic_conf.cc_shift);
 179         printk("        wt %d sh %d cst %d assoc %d\n",
 180                 cache_info.ic_conf.cc_wt,
 181                 cache_info.ic_conf.cc_sh,
 182                 cache_info.ic_conf.cc_cst,
 183                 cache_info.ic_conf.cc_assoc);
 184
 185         printk("D-TLB conf: sh %d page %d cst %d aid %d pad1 %d \n",
 186                 cache_info.dt_conf.tc_sh,
 187                 cache_info.dt_conf.tc_page,
 188                 cache_info.dt_conf.tc_cst,
 189                 cache_info.dt_conf.tc_aid,
 190                 cache_info.dt_conf.tc_pad1);
 191
 192         printk("I-TLB conf: sh %d page %d cst %d aid %d pad1 %d \n",
 193                 cache_info.it_conf.tc_sh,
 194                 cache_info.it_conf.tc_page,
 195                 cache_info.it_conf.tc_cst,
 196                 cache_info.it_conf.tc_aid,
 197                 cache_info.it_conf.tc_pad1);
 198 #endif
 199
 200         split_tlb = 0;
 201         if (cache_info.dt_conf.tc_sh == 0 || cache_info.dt_conf.tc_sh == 2) {
 202                 if (cache_info.dt_conf.tc_sh == 2)
 203                         printk(KERN_WARNING "Unexpected TLB configuration. "
 204                         "Will flush I/D separately (could be optimized).\n");
 205
 206                 split_tlb = 1;
 207         }
 208
 209         /* "New and Improved" version from Jim Hull
 210          *      (1 << (cc_block-1)) * (cc_line << (4 + cnf.cc_shift))
 211          * The following CAFL_STRIDE is an optimized version, see
 212          * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023625.html
 213          * http://lists.parisc-linux.org/pipermail/parisc-linux/2004-June/023671.html
 214          */
 215 #define CAFL_STRIDE(cnf) (cnf.cc_line << (3 + cnf.cc_block + cnf.cc_shift))
 216         dcache_stride = CAFL_STRIDE(cache_info.dc_conf);
 217         icache_stride = CAFL_STRIDE(cache_info.ic_conf);
 218 #undef CAFL_STRIDE
 219
 220 #ifndef CONFIG_PA20
 221         if (pdc_btlb_info(&btlb_info) < 0) {
 222                 memset(&btlb_info, 0, sizeof btlb_info);
 223         }
 224 #endif
 225
 226         if ((boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) ==
 227                                                 PDC_MODEL_NVA_UNSUPPORTED) {
 228                 printk(KERN_WARNING "parisc_cache_init: Only equivalent aliasing supported!\n");
 229 #if 0
 230                 panic("SMP kernel required to avoid non-equivalent aliasing");
 231 #endif
 232         }
 233 }
 234
 235 void disable_sr_hashing(void)
 236 {
 237         int srhash_type;
 238
 239         switch (boot_cpu_data.cpu_type) {
 240         case pcx: /* We shouldn't get this far.  setup.c should prevent it. */
 241                 BUG();
 242                 return;
 243
 244         case pcxs:
 245         case pcxt:
 246         case pcxt_:
 247                 srhash_type = SRHASH_PCXST;
 248                 break;
 249
 250         case pcxl:
 251                 srhash_type = SRHASH_PCXL;
 252                 break;
 253
 254         case pcxl2: /* pcxl2 doesn't support space register hashing */
 255                 return;
 256
 257         default: /* Currently all PA2.0 machines use the same ins. sequence */
 258                 srhash_type = SRHASH_PA20;
 259                 break;
 260         }
 261
 262         disable_sr_hashing_asm(srhash_type);
 263 }
 264
 265 void flush_dcache_page(struct page *page)
 266 {
 267         struct address_space *mapping = page_mapping(page);
 268         struct vm_area_struct *mpnt;
 269         struct prio_tree_iter iter;
 270         unsigned long offset;
 271         unsigned long addr;
 272         pgoff_t pgoff;
 273         unsigned long pfn = page_to_pfn(page);
 274
 275
 276         if (mapping && !mapping_mapped(mapping)) {
 277                 set_bit(PG_dcache_dirty, &page->flags);
 278                 return;
 279         }
 280
 281         flush_kernel_dcache_page(page_address(page));
 282
 283         if (!mapping)
 284                 return;
 285
 286         pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
 287
 288         /* We have carefully arranged in arch_get_unmapped_area() that
 289          * *any* mappings of a file are always congruently mapped (whether
 290          * declared as MAP_PRIVATE or MAP_SHARED), so we only need
 291          * to flush one address here for them all to become coherent */
 292
 293         flush_dcache_mmap_lock(mapping);
 294         vma_prio_tree_foreach(mpnt, &iter, &mapping->i_mmap, pgoff, pgoff) {
 295                 offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
 296                 addr = mpnt->vm_start + offset;
 297
 298                 /* Flush instructions produce non access tlb misses.
 299                  * On PA, we nullify these instructions rather than
 300                  * taking a page fault if the pte doesn't exist.
 301                  * This is just for speed.  If the page translation
 302                  * isn't there, there's no point exciting the
 303                  * nadtlb handler into a nullification frenzy.
 304                  *
 305                  * Make sure we really have this page: the private
 306                  * mappings may cover this area but have COW'd this
 307                  * particular page.
 308                  */
 309                 if (translation_exists(mpnt, addr, pfn)) {
 310                         __flush_cache_page(mpnt, addr);
 311                         break;
 312                 }
 313         }
 314         flush_dcache_mmap_unlock(mapping);
 315 }
 316 EXPORT_SYMBOL(flush_dcache_page);
 317
 318 /* Defined in arch/parisc/kernel/pacache.S */
 319 EXPORT_SYMBOL(flush_kernel_dcache_range_asm);
 320 EXPORT_SYMBOL(flush_kernel_dcache_page);
 321 EXPORT_SYMBOL(flush_data_cache_local);
 322 EXPORT_SYMBOL(flush_kernel_icache_range_asm);
 323
 324 void clear_user_page_asm(void *page, unsigned long vaddr)
 325 {
 326         /* This function is implemented in assembly in pacache.S */
 327         extern void __clear_user_page_asm(void *page, unsigned long vaddr);
 328
 329         purge_tlb_start();
 330         __clear_user_page_asm(page, vaddr);
 331         purge_tlb_end();
 332 }
 333
 334 #define FLUSH_THRESHOLD 0x80000 /* 0.5MB */
 335 int parisc_cache_flush_threshold __read_mostly = FLUSH_THRESHOLD;
 336
 337 void parisc_setup_cache_timing(void)
 338 {
 339         unsigned long rangetime, alltime;
 340         unsigned long size;
 341
 342         alltime = mfctl(16);
 343         flush_data_cache();
 344         alltime = mfctl(16) - alltime;
 345
 346         size = (unsigned long)(_end - _text);
 347         rangetime = mfctl(16);
 348         flush_kernel_dcache_range((unsigned long)_text, size);
 349         rangetime = mfctl(16) - rangetime;
 350
 351         printk(KERN_DEBUG "Whole cache flush %lu cycles, flushing %lu bytes %lu cycles\n",
 352                 alltime, size, rangetime);
 353
 354         /* Racy, but if we see an intermediate value, it's ok too... */
 355         parisc_cache_flush_threshold = size * alltime / rangetime;
 356
 357         parisc_cache_flush_threshold = (parisc_cache_flush_threshold + L1_CACHE_BYTES - 1) &~ (L1_CACHE_BYTES - 1);
 358         if (!parisc_cache_flush_threshold)
 359                 parisc_cache_flush_threshold = FLUSH_THRESHOLD;
 360
 361         printk("Setting cache flush threshold to %x (%d CPUs online)\n", parisc_cache_flush_threshold, num_online_cpus());
 362 }