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/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/sched.h>
  11 #include <linux/smp.h>
  12 #include <linux/mm.h>
  13 #include <linux/bitops.h>
  14 #include <linux/cpu.h>
  15 #include <linux/io.h>
  16
  17 #include <asm/bcache.h>
  18 #include <asm/bootinfo.h>
  19 #include <asm/cacheops.h>
  20 #include <asm/cpu-features.h>
  21 #include <asm/page.h>
  22 #include <asm/pgtable.h>
  23 #include <asm/r4kcache.h>
  24 #include <asm/system.h>
  25 #include <asm/mmu_context.h>
  26 #include <asm/war.h>
  27
  28 #include <asm/octeon/octeon.h>
  29
  30 unsigned long long cache_err_dcache[NR_CPUS];
  31
  32 /**
  33  * Octeon automatically flushes the dcache on tlb changes, so
  34  * from Linux's viewpoint it acts much like a physically
  35  * tagged cache. No flushing is needed
  36  *
  37  */
  38 static void octeon_flush_data_cache_page(unsigned long addr)
  39 {
  40     /* Nothing to do */
  41 }
  42
  43 static inline void octeon_local_flush_icache(void)
  44 {
  45         asm volatile ("synci 0($0)");
  46 }
  47
  48 /*
  49  * Flush local I-cache for the specified range.
  50  */
  51 static void local_octeon_flush_icache_range(unsigned long start,
  52                                             unsigned long end)
  53 {
  54         octeon_local_flush_icache();
  55 }
  56
  57 /**
  58  * Flush caches as necessary for all cores affected by a
  59  * vma. If no vma is supplied, all cores are flushed.
  60  *
  61  * @vma:    VMA to flush or NULL to flush all icaches.
  62  */
  63 static void octeon_flush_icache_all_cores(struct vm_area_struct *vma)
  64 {
  65         extern void octeon_send_ipi_single(int cpu, unsigned int action);
  66 #ifdef CONFIG_SMP
  67         int cpu;
  68         cpumask_t mask;
  69 #endif
  70
  71         mb();
  72         octeon_local_flush_icache();
  73 #ifdef CONFIG_SMP
  74         preempt_disable();
  75         cpu = smp_processor_id();
  76
  77         /*
  78          * If we have a vma structure, we only need to worry about
  79          * cores it has been used on
  80          */
  81         if (vma)
  82                 mask = *mm_cpumask(vma->vm_mm);
  83         else
  84                 mask = cpu_online_map;
  85         cpu_clear(cpu, mask);
  86         for_each_cpu_mask(cpu, mask)
  87                 octeon_send_ipi_single(cpu, SMP_ICACHE_FLUSH);
  88
  89         preempt_enable();
  90 #endif
  91 }
  92
  93
  94 /**
  95  * Called to flush the icache on all cores
  96  */
  97 static void octeon_flush_icache_all(void)
  98 {
  99         octeon_flush_icache_all_cores(NULL);
 100 }
 101
 102
 103 /**
 104  * Called to flush all memory associated with a memory
 105  * context.
 106  *
 107  * @mm:     Memory context to flush
 108  */
 109 static void octeon_flush_cache_mm(struct mm_struct *mm)
 110 {
 111         /*
 112          * According to the R4K version of this file, CPUs without
 113          * dcache aliases don't need to do anything here
 114          */
 115 }
 116
 117
 118 /**
 119  * Flush a range of kernel addresses out of the icache
 120  *
 121  */
 122 static void octeon_flush_icache_range(unsigned long start, unsigned long end)
 123 {
 124         octeon_flush_icache_all_cores(NULL);
 125 }
 126
 127
 128 /**
 129  * Flush the icache for a trampoline. These are used for interrupt
 130  * and exception hooking.
 131  *
 132  * @addr:   Address to flush
 133  */
 134 static void octeon_flush_cache_sigtramp(unsigned long addr)
 135 {
 136         struct vm_area_struct *vma;
 137
 138         vma = find_vma(current->mm, addr);
 139         octeon_flush_icache_all_cores(vma);
 140 }
 141
 142
 143 /**
 144  * Flush a range out of a vma
 145  *
 146  * @vma:    VMA to flush
 147  * @start:
 148  * @end:
 149  */
 150 static void octeon_flush_cache_range(struct vm_area_struct *vma,
 151                                      unsigned long start, unsigned long end)
 152 {
 153         if (vma->vm_flags & VM_EXEC)
 154                 octeon_flush_icache_all_cores(vma);
 155 }
 156
 157
 158 /**
 159  * Flush a specific page of a vma
 160  *
 161  * @vma:    VMA to flush page for
 162  * @page:   Page to flush
 163  * @pfn:
 164  */
 165 static void octeon_flush_cache_page(struct vm_area_struct *vma,
 166                                     unsigned long page, unsigned long pfn)
 167 {
 168         if (vma->vm_flags & VM_EXEC)
 169                 octeon_flush_icache_all_cores(vma);
 170 }
 171
 172
 173 /**
 174  * Probe Octeon's caches
 175  *
 176  */
 177 static void __cpuinit probe_octeon(void)
 178 {
 179         unsigned long icache_size;
 180         unsigned long dcache_size;
 181         unsigned int config1;
 182         struct cpuinfo_mips *c = &current_cpu_data;
 183
 184         switch (c->cputype) {
 185         case CPU_CAVIUM_OCTEON:
 186         case CPU_CAVIUM_OCTEON_PLUS:
 187                 config1 = read_c0_config1();
 188                 c->icache.linesz = 2 << ((config1 >> 19) & 7);
 189                 c->icache.sets = 64 << ((config1 >> 22) & 7);
 190                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 191                 c->icache.flags |= MIPS_CACHE_VTAG;
 192                 icache_size =
 193                         c->icache.sets * c->icache.ways * c->icache.linesz;
 194                 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
 195                 c->dcache.linesz = 128;
 196                 if (c->cputype == CPU_CAVIUM_OCTEON_PLUS)
 197                         c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
 198                 else
 199                         c->dcache.sets = 1; /* CN3XXX has one Dcache set */
 200                 c->dcache.ways = 64;
 201                 dcache_size =
 202                         c->dcache.sets * c->dcache.ways * c->dcache.linesz;
 203                 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
 204                 c->options |= MIPS_CPU_PREFETCH;
 205                 break;
 206
 207         default:
 208                 panic("Unsupported Cavium Networks CPU type\n");
 209                 break;
 210         }
 211
 212         /* compute a couple of other cache variables */
 213         c->icache.waysize = icache_size / c->icache.ways;
 214         c->dcache.waysize = dcache_size / c->dcache.ways;
 215
 216         c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
 217         c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
 218
 219         if (smp_processor_id() == 0) {
 220                 pr_notice("Primary instruction cache %ldkB, %s, %d way, "
 221                           "%d sets, linesize %d bytes.\n",
 222                           icache_size >> 10,
 223                           cpu_has_vtag_icache ?
 224                                 "virtually tagged" : "physically tagged",
 225                           c->icache.ways, c->icache.sets, c->icache.linesz);
 226
 227                 pr_notice("Primary data cache %ldkB, %d-way, %d sets, "
 228                           "linesize %d bytes.\n",
 229                           dcache_size >> 10, c->dcache.ways,
 230                           c->dcache.sets, c->dcache.linesz);
 231         }
 232 }
 233
 234
 235 /**
 236  * Setup the Octeon cache flush routines
 237  *
 238  */
 239 void __cpuinit octeon_cache_init(void)
 240 {
 241         extern unsigned long ebase;
 242         extern char except_vec2_octeon;
 243
 244         memcpy((void *)(ebase + 0x100), &except_vec2_octeon, 0x80);
 245         octeon_flush_cache_sigtramp(ebase + 0x100);
 246
 247         probe_octeon();
 248
 249         shm_align_mask = PAGE_SIZE - 1;
 250
 251         flush_cache_all                 = octeon_flush_icache_all;
 252         __flush_cache_all               = octeon_flush_icache_all;
 253         flush_cache_mm                  = octeon_flush_cache_mm;
 254         flush_cache_page                = octeon_flush_cache_page;
 255         flush_cache_range               = octeon_flush_cache_range;
 256         flush_cache_sigtramp            = octeon_flush_cache_sigtramp;
 257         flush_icache_all                = octeon_flush_icache_all;
 258         flush_data_cache_page           = octeon_flush_data_cache_page;
 259         flush_icache_range              = octeon_flush_icache_range;
 260         local_flush_icache_range        = local_octeon_flush_icache_range;
 261
 262         build_clear_page();
 263         build_copy_page();
 264 }
 265
 266 /**
 267  * Handle a cache error exception
 268  */
 269
 270 static void  cache_parity_error_octeon(int non_recoverable)
 271 {
 272         unsigned long coreid = cvmx_get_core_num();
 273         uint64_t icache_err = read_octeon_c0_icacheerr();
 274
 275         pr_err("Cache error exception:\n");
 276         pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
 277         if (icache_err & 1) {
 278                 pr_err("CacheErr (Icache) == %llx\n",
 279                        (unsigned long long)icache_err);
 280                 write_octeon_c0_icacheerr(0);
 281         }
 282         if (cache_err_dcache[coreid] & 1) {
 283                 pr_err("CacheErr (Dcache) == %llx\n",
 284                        (unsigned long long)cache_err_dcache[coreid]);
 285                 cache_err_dcache[coreid] = 0;
 286         }
 287
 288         if (non_recoverable)
 289                 panic("Can't handle cache error: nested exception");
 290 }
 291
 292 /**
 293  * Called when the the exception is recoverable
 294  */
 295
 296 asmlinkage void cache_parity_error_octeon_recoverable(void)
 297 {
 298         cache_parity_error_octeon(0);
 299 }
 300
 301 /**
 302  * Called when the the exception is not recoverable
 303  */
 304
 305 asmlinkage void cache_parity_error_octeon_non_recoverable(void)
 306 {
 307         cache_parity_error_octeon(1);
 308 }