arch/mips/mm/c-octeon.c

   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) 2005-2007 Cavium Networks
   7  */
   8 #include <linux/export.h>
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/smp.h>
  13 #include <linux/mm.h>
  14 #include <linux/bitops.h>
  15 #include <linux/cpu.h>
  16 #include <linux/io.h>
  17
  18 #include <asm/bcache.h>
  19 #include <asm/bootinfo.h>
  20 #include <asm/cacheops.h>
  21 #include <asm/cpu-features.h>
  22 #include <asm/page.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/r4kcache.h>
  25 #include <asm/traps.h>
  26 #include <asm/mmu_context.h>
  27 #include <asm/war.h>
  28
  29 #include <asm/octeon/octeon.h>
  30
  31 unsigned long long cache_err_dcache[NR_CPUS];
  32 EXPORT_SYMBOL_GPL(cache_err_dcache);
  33
  34 /**
  35  * Octeon automatically flushes the dcache on tlb changes, so
  36  * from Linux's viewpoint it acts much like a physically
  37  * tagged cache. No flushing is needed
  38  *
  39  */
  40 static void octeon_flush_data_cache_page(unsigned long addr)
  41 {
  42     /* Nothing to do */
  43 }
  44
  45 static inline void octeon_local_flush_icache(void)
  46 {
  47         asm volatile ("synci 0($0)");
  48 }
  49
  50 /*
  51  * Flush local I-cache for the specified range.
  52  */
  53 static void local_octeon_flush_icache_range(unsigned long start,
  54                                             unsigned long end)
  55 {
  56         octeon_local_flush_icache();
  57 }
  58
  59 /**
  60  * Flush caches as necessary for all cores affected by a
  61  * vma. If no vma is supplied, all cores are flushed.
  62  *
  63  * @vma:    VMA to flush or NULL to flush all icaches.
  64  */
  65 static void octeon_flush_icache_all_cores(struct vm_area_struct *vma)
  66 {
  67         extern void octeon_send_ipi_single(int cpu, unsigned int action);
  68 #ifdef CONFIG_SMP
  69         int cpu;
  70         cpumask_t mask;
  71 #endif
  72
  73         mb();
  74         octeon_local_flush_icache();
  75 #ifdef CONFIG_SMP
  76         preempt_disable();
  77         cpu = smp_processor_id();
  78
  79         /*
  80          * If we have a vma structure, we only need to worry about
  81          * cores it has been used on
  82          */
  83         if (vma)
  84                 mask = *mm_cpumask(vma->vm_mm);
  85         else
  86                 mask = *cpu_online_mask;
  87         cpumask_clear_cpu(cpu, &mask);
  88         for_each_cpu(cpu, &mask)
  89                 octeon_send_ipi_single(cpu, SMP_ICACHE_FLUSH);
  90
  91         preempt_enable();
  92 #endif
  93 }
  94
  95
  96 /**
  97  * Called to flush the icache on all cores
  98  */
  99 static void octeon_flush_icache_all(void)
 100 {
 101         octeon_flush_icache_all_cores(NULL);
 102 }
 103
 104
 105 /**
 106  * Called to flush all memory associated with a memory
 107  * context.
 108  *
 109  * @mm:     Memory context to flush
 110  */
 111 static void octeon_flush_cache_mm(struct mm_struct *mm)
 112 {
 113         /*
 114          * According to the R4K version of this file, CPUs without
 115          * dcache aliases don't need to do anything here
 116          */
 117 }
 118
 119
 120 /**
 121  * Flush a range of kernel addresses out of the icache
 122  *
 123  */
 124 static void octeon_flush_icache_range(unsigned long start, unsigned long end)
 125 {
 126         octeon_flush_icache_all_cores(NULL);
 127 }
 128
 129
 130 /**
 131  * Flush the icache for a trampoline. These are used for interrupt
 132  * and exception hooking.
 133  *
 134  * @addr:   Address to flush
 135  */
 136 static void octeon_flush_cache_sigtramp(unsigned long addr)
 137 {
 138         struct vm_area_struct *vma;
 139
 140         vma = find_vma(current->mm, addr);
 141         octeon_flush_icache_all_cores(vma);
 142 }
 143
 144
 145 /**
 146  * Flush a range out of a vma
 147  *
 148  * @vma:    VMA to flush
 149  * @start:
 150  * @end:
 151  */
 152 static void octeon_flush_cache_range(struct vm_area_struct *vma,
 153                                      unsigned long start, unsigned long end)
 154 {
 155         if (vma->vm_flags & VM_EXEC)
 156                 octeon_flush_icache_all_cores(vma);
 157 }
 158
 159
 160 /**
 161  * Flush a specific page of a vma
 162  *
 163  * @vma:    VMA to flush page for
 164  * @page:   Page to flush
 165  * @pfn:
 166  */
 167 static void octeon_flush_cache_page(struct vm_area_struct *vma,
 168                                     unsigned long page, unsigned long pfn)
 169 {
 170         if (vma->vm_flags & VM_EXEC)
 171                 octeon_flush_icache_all_cores(vma);
 172 }
 173
 174 static void octeon_flush_kernel_vmap_range(unsigned long vaddr, int size)
 175 {
 176         BUG();
 177 }
 178
 179 /**
 180  * Probe Octeon's caches
 181  *
 182  */
 183 static void __cpuinit probe_octeon(void)
 184 {
 185         unsigned long icache_size;
 186         unsigned long dcache_size;
 187         unsigned int config1;
 188         struct cpuinfo_mips *c = &current_cpu_data;
 189
 190         config1 = read_c0_config1();
 191         switch (c->cputype) {
 192         case CPU_CAVIUM_OCTEON:
 193         case CPU_CAVIUM_OCTEON_PLUS:
 194                 c->icache.linesz = 2 << ((config1 >> 19) & 7);
 195                 c->icache.sets = 64 << ((config1 >> 22) & 7);
 196                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 197                 c->icache.flags |= MIPS_CACHE_VTAG;
 198                 icache_size =
 199                         c->icache.sets * c->icache.ways * c->icache.linesz;
 200                 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
 201                 c->dcache.linesz = 128;
 202                 if (c->cputype == CPU_CAVIUM_OCTEON_PLUS)
 203                         c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
 204                 else
 205                         c->dcache.sets = 1; /* CN3XXX has one Dcache set */
 206                 c->dcache.ways = 64;
 207                 dcache_size =
 208                         c->dcache.sets * c->dcache.ways * c->dcache.linesz;
 209                 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
 210                 c->options |= MIPS_CPU_PREFETCH;
 211                 break;
 212
 213         case CPU_CAVIUM_OCTEON2:
 214                 c->icache.linesz = 2 << ((config1 >> 19) & 7);
 215                 c->icache.sets = 8;
 216                 c->icache.ways = 37;
 217                 c->icache.flags |= MIPS_CACHE_VTAG;
 218                 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
 219
 220                 c->dcache.linesz = 128;
 221                 c->dcache.ways = 32;
 222                 c->dcache.sets = 8;
 223                 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
 224                 c->options |= MIPS_CPU_PREFETCH;
 225                 break;
 226
 227         default:
 228                 panic("Unsupported Cavium Networks CPU type");
 229                 break;
 230         }
 231
 232         /* compute a couple of other cache variables */
 233         c->icache.waysize = icache_size / c->icache.ways;
 234         c->dcache.waysize = dcache_size / c->dcache.ways;
 235
 236         c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
 237         c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
 238
 239         if (smp_processor_id() == 0) {
 240                 pr_notice("Primary instruction cache %ldkB, %s, %d way, "
 241                           "%d sets, linesize %d bytes.\n",
 242                           icache_size >> 10,
 243                           cpu_has_vtag_icache ?
 244                                 "virtually tagged" : "physically tagged",
 245                           c->icache.ways, c->icache.sets, c->icache.linesz);
 246
 247                 pr_notice("Primary data cache %ldkB, %d-way, %d sets, "
 248                           "linesize %d bytes.\n",
 249                           dcache_size >> 10, c->dcache.ways,
 250                           c->dcache.sets, c->dcache.linesz);
 251         }
 252 }
 253
 254 static void  __cpuinit octeon_cache_error_setup(void)
 255 {
 256         extern char except_vec2_octeon;
 257         set_handler(0x100, &except_vec2_octeon, 0x80);
 258 }
 259
 260 /**
 261  * Setup the Octeon cache flush routines
 262  *
 263  */
 264 void __cpuinit octeon_cache_init(void)
 265 {
 266         probe_octeon();
 267
 268         shm_align_mask = PAGE_SIZE - 1;
 269
 270         flush_cache_all                 = octeon_flush_icache_all;
 271         __flush_cache_all               = octeon_flush_icache_all;
 272         flush_cache_mm                  = octeon_flush_cache_mm;
 273         flush_cache_page                = octeon_flush_cache_page;
 274         flush_cache_range               = octeon_flush_cache_range;
 275         flush_cache_sigtramp            = octeon_flush_cache_sigtramp;
 276         flush_icache_all                = octeon_flush_icache_all;
 277         flush_data_cache_page           = octeon_flush_data_cache_page;
 278         flush_icache_range              = octeon_flush_icache_range;
 279         local_flush_icache_range        = local_octeon_flush_icache_range;
 280
 281         __flush_kernel_vmap_range       = octeon_flush_kernel_vmap_range;
 282
 283         build_clear_page();
 284         build_copy_page();
 285
 286         board_cache_error_setup = octeon_cache_error_setup;
 287 }
 288
 289 /*
 290  * Handle a cache error exception
 291  */
 292 static RAW_NOTIFIER_HEAD(co_cache_error_chain);
 293
 294 int register_co_cache_error_notifier(struct notifier_block *nb)
 295 {
 296         return raw_notifier_chain_register(&co_cache_error_chain, nb);
 297 }
 298 EXPORT_SYMBOL_GPL(register_co_cache_error_notifier);
 299
 300 int unregister_co_cache_error_notifier(struct notifier_block *nb)
 301 {
 302         return raw_notifier_chain_unregister(&co_cache_error_chain, nb);
 303 }
 304 EXPORT_SYMBOL_GPL(unregister_co_cache_error_notifier);
 305
 306 static void co_cache_error_call_notifiers(unsigned long val)
 307 {
 308         int rv = raw_notifier_call_chain(&co_cache_error_chain, val, NULL);
 309         if ((rv & ~NOTIFY_STOP_MASK) != NOTIFY_OK) {
 310                 u64 dcache_err;
 311                 unsigned long coreid = cvmx_get_core_num();
 312                 u64 icache_err = read_octeon_c0_icacheerr();
 313
 314                 if (val) {
 315                         dcache_err = cache_err_dcache[coreid];
 316                         cache_err_dcache[coreid] = 0;
 317                 } else {
 318                         dcache_err = read_octeon_c0_dcacheerr();
 319                 }
 320
 321                 pr_err("Core%lu: Cache error exception:\n", coreid);
 322                 pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
 323                 if (icache_err & 1) {
 324                         pr_err("CacheErr (Icache) == %llx\n",
 325                                (unsigned long long)icache_err);
 326                         write_octeon_c0_icacheerr(0);
 327                 }
 328                 if (dcache_err & 1) {
 329                         pr_err("CacheErr (Dcache) == %llx\n",
 330                                (unsigned long long)dcache_err);
 331                 }
 332         }
 333 }
 334
 335 /*
 336  * Called when the the exception is recoverable
 337  */
 338
 339 asmlinkage void cache_parity_error_octeon_recoverable(void)
 340 {
 341         co_cache_error_call_notifiers(0);
 342 }
 343
 344 /**
 345  * Called when the the exception is not recoverable
 346  */
 347
 348 asmlinkage void cache_parity_error_octeon_non_recoverable(void)
 349 {
 350         co_cache_error_call_notifiers(1);
 351         panic("Can't handle cache error: nested exception");
 352 }