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 static void octeon_flush_kernel_vmap_range(unsigned long vaddr, int size)
 173 {
 174         BUG();
 175 }
 176
 177 /**
 178  * Probe Octeon's caches
 179  *
 180  */
 181 static void __cpuinit probe_octeon(void)
 182 {
 183         unsigned long icache_size;
 184         unsigned long dcache_size;
 185         unsigned int config1;
 186         struct cpuinfo_mips *c = &current_cpu_data;
 187
 188         config1 = read_c0_config1();
 189         switch (c->cputype) {
 190         case CPU_CAVIUM_OCTEON:
 191         case CPU_CAVIUM_OCTEON_PLUS:
 192                 c->icache.linesz = 2 << ((config1 >> 19) & 7);
 193                 c->icache.sets = 64 << ((config1 >> 22) & 7);
 194                 c->icache.ways = 1 + ((config1 >> 16) & 7);
 195                 c->icache.flags |= MIPS_CACHE_VTAG;
 196                 icache_size =
 197                         c->icache.sets * c->icache.ways * c->icache.linesz;
 198                 c->icache.waybit = ffs(icache_size / c->icache.ways) - 1;
 199                 c->dcache.linesz = 128;
 200                 if (c->cputype == CPU_CAVIUM_OCTEON_PLUS)
 201                         c->dcache.sets = 2; /* CN5XXX has two Dcache sets */
 202                 else
 203                         c->dcache.sets = 1; /* CN3XXX has one Dcache set */
 204                 c->dcache.ways = 64;
 205                 dcache_size =
 206                         c->dcache.sets * c->dcache.ways * c->dcache.linesz;
 207                 c->dcache.waybit = ffs(dcache_size / c->dcache.ways) - 1;
 208                 c->options |= MIPS_CPU_PREFETCH;
 209                 break;
 210
 211         case CPU_CAVIUM_OCTEON2:
 212                 c->icache.linesz = 2 << ((config1 >> 19) & 7);
 213                 c->icache.sets = 8;
 214                 c->icache.ways = 37;
 215                 c->icache.flags |= MIPS_CACHE_VTAG;
 216                 icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
 217
 218                 c->dcache.linesz = 128;
 219                 c->dcache.ways = 32;
 220                 c->dcache.sets = 8;
 221                 dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
 222                 c->options |= MIPS_CPU_PREFETCH;
 223                 break;
 224
 225         default:
 226                 panic("Unsupported Cavium Networks CPU type\n");
 227                 break;
 228         }
 229
 230         /* compute a couple of other cache variables */
 231         c->icache.waysize = icache_size / c->icache.ways;
 232         c->dcache.waysize = dcache_size / c->dcache.ways;
 233
 234         c->icache.sets = icache_size / (c->icache.linesz * c->icache.ways);
 235         c->dcache.sets = dcache_size / (c->dcache.linesz * c->dcache.ways);
 236
 237         if (smp_processor_id() == 0) {
 238                 pr_notice("Primary instruction cache %ldkB, %s, %d way, "
 239                           "%d sets, linesize %d bytes.\n",
 240                           icache_size >> 10,
 241                           cpu_has_vtag_icache ?
 242                                 "virtually tagged" : "physically tagged",
 243                           c->icache.ways, c->icache.sets, c->icache.linesz);
 244
 245                 pr_notice("Primary data cache %ldkB, %d-way, %d sets, "
 246                           "linesize %d bytes.\n",
 247                           dcache_size >> 10, c->dcache.ways,
 248                           c->dcache.sets, c->dcache.linesz);
 249         }
 250 }
 251
 252
 253 /**
 254  * Setup the Octeon cache flush routines
 255  *
 256  */
 257 void __cpuinit octeon_cache_init(void)
 258 {
 259         extern unsigned long ebase;
 260         extern char except_vec2_octeon;
 261
 262         memcpy((void *)(ebase + 0x100), &except_vec2_octeon, 0x80);
 263         octeon_flush_cache_sigtramp(ebase + 0x100);
 264
 265         probe_octeon();
 266
 267         shm_align_mask = PAGE_SIZE - 1;
 268
 269         flush_cache_all                 = octeon_flush_icache_all;
 270         __flush_cache_all               = octeon_flush_icache_all;
 271         flush_cache_mm                  = octeon_flush_cache_mm;
 272         flush_cache_page                = octeon_flush_cache_page;
 273         flush_cache_range               = octeon_flush_cache_range;
 274         flush_cache_sigtramp            = octeon_flush_cache_sigtramp;
 275         flush_icache_all                = octeon_flush_icache_all;
 276         flush_data_cache_page           = octeon_flush_data_cache_page;
 277         flush_icache_range              = octeon_flush_icache_range;
 278         local_flush_icache_range        = local_octeon_flush_icache_range;
 279
 280         __flush_kernel_vmap_range       = octeon_flush_kernel_vmap_range;
 281
 282         build_clear_page();
 283         build_copy_page();
 284 }
 285
 286 /**
 287  * Handle a cache error exception
 288  */
 289
 290 static void  cache_parity_error_octeon(int non_recoverable)
 291 {
 292         unsigned long coreid = cvmx_get_core_num();
 293         uint64_t icache_err = read_octeon_c0_icacheerr();
 294
 295         pr_err("Cache error exception:\n");
 296         pr_err("cp0_errorepc == %lx\n", read_c0_errorepc());
 297         if (icache_err & 1) {
 298                 pr_err("CacheErr (Icache) == %llx\n",
 299                        (unsigned long long)icache_err);
 300                 write_octeon_c0_icacheerr(0);
 301         }
 302         if (cache_err_dcache[coreid] & 1) {
 303                 pr_err("CacheErr (Dcache) == %llx\n",
 304                        (unsigned long long)cache_err_dcache[coreid]);
 305                 cache_err_dcache[coreid] = 0;
 306         }
 307
 308         if (non_recoverable)
 309                 panic("Can't handle cache error: nested exception");
 310 }
 311
 312 /**
 313  * Called when the the exception is recoverable
 314  */
 315
 316 asmlinkage void cache_parity_error_octeon_recoverable(void)
 317 {
 318         cache_parity_error_octeon(0);
 319 }
 320
 321 /**
 322  * Called when the the exception is not recoverable
 323  */
 324
 325 asmlinkage void cache_parity_error_octeon_non_recoverable(void)
 326 {
 327         cache_parity_error_octeon(1);
 328 }