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