LXR linux/arch/alpha/kernel/err

   1/*
   2 *      linux/arch/alpha/kernel/err_ev6.c
   3 *
   4 *      Copyright (C) 2000 Jeff Wiedemeier (Compaq Computer Corporation)
   5 *
   6 *      Error handling code supporting Alpha systems
   7 */
   8
   9#include <linux/sched.h>
  10
  11#include <asm/io.h>
  12#include <asm/irq_regs.h>
  13#include <asm/hwrpb.h>
  14#include <asm/smp.h>
  15#include <asm/err_common.h>
  16#include <asm/err_ev6.h>
  17
  18#include "err_impl.h"
  19#include "proto.h"
  20
  21static int
  22ev6_parse_ibox(u64 i_stat, int print)
  23{
  24        int status = MCHK_DISPOSITION_REPORT;
  25
  26#define EV6__I_STAT__PAR        (1UL << 29)
  27#define EV6__I_STAT__ERRMASK    (EV6__I_STAT__PAR)
  28
  29        if (!(i_stat & EV6__I_STAT__ERRMASK))
  30                return MCHK_DISPOSITION_UNKNOWN_ERROR;
  31
  32        if (!print)
  33                return status;
  34
  35        if (i_stat & EV6__I_STAT__PAR)
  36                printk("%s    Icache parity error\n", err_print_prefix);
  37
  38        return status;
  39}
  40
  41static int
  42ev6_parse_mbox(u64 mm_stat, u64 d_stat, u64 c_stat, int print)
  43{
  44        int status = MCHK_DISPOSITION_REPORT;
  45
  46#define EV6__MM_STAT__DC_TAG_PERR       (1UL << 10)
  47#define EV6__MM_STAT__ERRMASK           (EV6__MM_STAT__DC_TAG_PERR)
  48#define EV6__D_STAT__TPERR_P0           (1UL << 0)
  49#define EV6__D_STAT__TPERR_P1           (1UL << 1)
  50#define EV6__D_STAT__ECC_ERR_ST         (1UL << 2)
  51#define EV6__D_STAT__ECC_ERR_LD         (1UL << 3)
  52#define EV6__D_STAT__SEO                (1UL << 4)
  53#define EV6__D_STAT__ERRMASK            (EV6__D_STAT__TPERR_P0 |        \
  54                                         EV6__D_STAT__TPERR_P1 |        \
  55                                         EV6__D_STAT__ECC_ERR_ST |      \
  56                                         EV6__D_STAT__ECC_ERR_LD |      \
  57                                         EV6__D_STAT__SEO)
  58
  59        if (!(d_stat & EV6__D_STAT__ERRMASK) && 
  60            !(mm_stat & EV6__MM_STAT__ERRMASK))
  61                return MCHK_DISPOSITION_UNKNOWN_ERROR;
  62
  63        if (!print)
  64                return status;
  65
  66        if (mm_stat & EV6__MM_STAT__DC_TAG_PERR)
  67                printk("%s    Dcache tag parity error on probe\n",
  68                       err_print_prefix);
  69        if (d_stat & EV6__D_STAT__TPERR_P0)
  70                printk("%s    Dcache tag parity error - pipe 0\n",
  71                       err_print_prefix);
  72        if (d_stat & EV6__D_STAT__TPERR_P1)
  73                printk("%s    Dcache tag parity error - pipe 1\n",
  74                       err_print_prefix);
  75        if (d_stat & EV6__D_STAT__ECC_ERR_ST)
  76                printk("%s    ECC error occurred on a store\n", 
  77                       err_print_prefix);
  78        if (d_stat & EV6__D_STAT__ECC_ERR_LD)
  79                printk("%s    ECC error occurred on a %s load\n",
  80                       err_print_prefix,
  81                       c_stat ? "" : "speculative ");
  82        if (d_stat & EV6__D_STAT__SEO)
  83                printk("%s    Dcache second error\n", err_print_prefix);
  84
  85        return status;
  86}
  87
  88static int
  89ev6_parse_cbox(u64 c_addr, u64 c1_syn, u64 c2_syn, 
  90               u64 c_stat, u64 c_sts, int print)
  91{
  92        static const char * const sourcename[] = {
  93                "UNKNOWN", "UNKNOWN", "UNKNOWN",
  94                "MEMORY", "BCACHE", "DCACHE",
  95                "BCACHE PROBE", "BCACHE PROBE"
  96        };
  97        static const char * const streamname[] = { "D", "I" };
  98        static const char * const bitsname[] = { "SINGLE", "DOUBLE" };
  99        int status = MCHK_DISPOSITION_REPORT;
 100        int source = -1, stream = -1, bits = -1;
 101
 102#define EV6__C_STAT__BC_PERR            (0x01)
 103#define EV6__C_STAT__DC_PERR            (0x02)
 104#define EV6__C_STAT__DSTREAM_MEM_ERR    (0x03)
 105#define EV6__C_STAT__DSTREAM_BC_ERR     (0x04)
 106#define EV6__C_STAT__DSTREAM_DC_ERR     (0x05)
 107#define EV6__C_STAT__PROBE_BC_ERR0      (0x06)  /* both 6 and 7 indicate... */
 108#define EV6__C_STAT__PROBE_BC_ERR1      (0x07)  /* ...probe bc error.       */
 109#define EV6__C_STAT__ISTREAM_MEM_ERR    (0x0B)
 110#define EV6__C_STAT__ISTREAM_BC_ERR     (0x0C)
 111#define EV6__C_STAT__DSTREAM_MEM_DBL    (0x13)
 112#define EV6__C_STAT__DSTREAM_BC_DBL     (0x14)
 113#define EV6__C_STAT__ISTREAM_MEM_DBL    (0x1B)
 114#define EV6__C_STAT__ISTREAM_BC_DBL     (0x1C)
 115#define EV6__C_STAT__SOURCE_MEMORY      (0x03)
 116#define EV6__C_STAT__SOURCE_BCACHE      (0x04)
 117#define EV6__C_STAT__SOURCE__S          (0)
 118#define EV6__C_STAT__SOURCE__M          (0x07)
 119#define EV6__C_STAT__ISTREAM__S         (3)
 120#define EV6__C_STAT__ISTREAM__M         (0x01)
 121#define EV6__C_STAT__DOUBLE__S          (4)
 122#define EV6__C_STAT__DOUBLE__M          (0x01)
 123#define EV6__C_STAT__ERRMASK            (0x1F)
 124#define EV6__C_STS__SHARED              (1 << 0)
 125#define EV6__C_STS__DIRTY               (1 << 1)
 126#define EV6__C_STS__VALID               (1 << 2)
 127#define EV6__C_STS__PARITY              (1 << 3)
 128
 129        if (!(c_stat & EV6__C_STAT__ERRMASK))
 130                return MCHK_DISPOSITION_UNKNOWN_ERROR;
 131
 132        if (!print)
 133                return status;
 134
 135        source = EXTRACT(c_stat, EV6__C_STAT__SOURCE);
 136        stream = EXTRACT(c_stat, EV6__C_STAT__ISTREAM);
 137        bits = EXTRACT(c_stat, EV6__C_STAT__DOUBLE);
 138
 139        if (c_stat & EV6__C_STAT__BC_PERR) {
 140                printk("%s    Bcache tag parity error\n", err_print_prefix);
 141                source = -1;
 142        }
 143
 144        if (c_stat & EV6__C_STAT__DC_PERR) {
 145                printk("%s    Dcache tag parity error\n", err_print_prefix);
 146                source = -1;
 147        }
 148
 149        if (c_stat == EV6__C_STAT__PROBE_BC_ERR0 ||
 150            c_stat == EV6__C_STAT__PROBE_BC_ERR1) {
 151                printk("%s    Bcache single-bit error on a probe hit\n",
 152                       err_print_prefix);
 153                source = -1;
 154        }
 155
 156        if (source != -1) 
 157                printk("%s    %s-STREAM %s-BIT ECC error from %s\n",
 158                       err_print_prefix,
 159                       streamname[stream], bitsname[bits], sourcename[source]);
 160
 161        printk("%s    Address: 0x%016llx\n"
 162                 "    Syndrome[upper.lower]: %02llx.%02llx\n",
 163               err_print_prefix,
 164               c_addr,
 165               c2_syn, c1_syn);
 166
 167        if (source == EV6__C_STAT__SOURCE_MEMORY ||
 168            source == EV6__C_STAT__SOURCE_BCACHE) 
 169                printk("%s    Block status: %s%s%s%s\n",
 170                       err_print_prefix,
 171                       (c_sts & EV6__C_STS__SHARED) ? "SHARED " : "",
 172                       (c_sts & EV6__C_STS__DIRTY)  ? "DIRTY "  : "",
 173                       (c_sts & EV6__C_STS__VALID)  ? "VALID "  : "",
 174                       (c_sts & EV6__C_STS__PARITY) ? "PARITY " : "");
 175                
 176        return status;
 177}
 178
 179void
 180ev6_register_error_handlers(void)
 181{
 182        /* None right now. */
 183}
 184
 185int
 186ev6_process_logout_frame(struct el_common *mchk_header, int print)
 187{
 188        struct el_common_EV6_mcheck *ev6mchk = 
 189                (struct el_common_EV6_mcheck *)mchk_header;
 190        int status = MCHK_DISPOSITION_UNKNOWN_ERROR;
 191
 192        status |= ev6_parse_ibox(ev6mchk->I_STAT, print);
 193        status |= ev6_parse_mbox(ev6mchk->MM_STAT, ev6mchk->DC_STAT, 
 194                                 ev6mchk->C_STAT, print);
 195        status |= ev6_parse_cbox(ev6mchk->C_ADDR, ev6mchk->DC1_SYNDROME,
 196                                 ev6mchk->DC0_SYNDROME, ev6mchk->C_STAT,
 197                                 ev6mchk->C_STS, print);
 198
 199        if (!print)
 200                return status;
 201
 202        if (status != MCHK_DISPOSITION_DISMISS) {
 203                char *saved_err_prefix = err_print_prefix;
 204
 205                /*
 206                 * Dump some additional information from the frame
 207                 */
 208                printk("%s    EXC_ADDR: 0x%016lx   IER_CM: 0x%016lx"
 209                            "   ISUM: 0x%016lx\n"
 210                         "    PAL_BASE: 0x%016lx   I_CTL:  0x%016lx"
 211                            "   PCTX: 0x%016lx\n",
 212                       err_print_prefix,
 213                       ev6mchk->EXC_ADDR, ev6mchk->IER_CM, ev6mchk->ISUM,
 214                       ev6mchk->PAL_BASE, ev6mchk->I_CTL, ev6mchk->PCTX);
 215
 216                if (status == MCHK_DISPOSITION_UNKNOWN_ERROR) {
 217                        printk("%s    UNKNOWN error, frame follows:\n",
 218                               err_print_prefix);
 219                } else {
 220                        /* had decode -- downgrade print level for frame */
 221                        err_print_prefix = KERN_NOTICE;
 222                }
 223
 224                mchk_dump_logout_frame(mchk_header);
 225
 226                err_print_prefix = saved_err_prefix;
 227        }
 228
 229        return status;
 230}
 231
 232void
 233ev6_machine_check(unsigned long vector, unsigned long la_ptr)
 234{
 235        struct el_common *mchk_header = (struct el_common *)la_ptr;
 236
 237        /*
 238         * Sync the processor
 239         */
 240        mb();
 241        draina();
 242
 243        /*
 244         * Parse the logout frame without printing first. If the only error(s)
 245         * found are have a disposition of "dismiss", then just dismiss them
 246         * and don't print any message
 247         */
 248        if (ev6_process_logout_frame(mchk_header, 0) != 
 249            MCHK_DISPOSITION_DISMISS) {
 250                char *saved_err_prefix = err_print_prefix;
 251                err_print_prefix = KERN_CRIT;
 252
 253                /*
 254                 * Either a nondismissable error was detected or no
 255                 * recognized error was detected  in the logout frame 
 256                 * -- report the error in either case
 257                 */
 258                printk("%s*CPU %s Error (Vector 0x%x) reported on CPU %d:\n", 
 259                       err_print_prefix,
 260                       (vector == SCB_Q_PROCERR)?"Correctable":"Uncorrectable",
 261                       (unsigned int)vector, (int)smp_processor_id());
 262                
 263                ev6_process_logout_frame(mchk_header, 1);
 264                dik_show_regs(get_irq_regs(), NULL);
 265
 266                err_print_prefix = saved_err_prefix;
 267        }
 268
 269        /* 
 270         * Release the logout frame 
 271         */
 272        wrmces(0x7);
 273        mb();
 274}
 275
 276