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   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/pci.h>
  11 #include <linux/sched.h>
  12
  13 #include <asm/io.h>
  14 #include <asm/irq_regs.h>
  15 #include <asm/hwrpb.h>
  16 #include <asm/smp.h>
  17 #include <asm/err_common.h>
  18 #include <asm/err_ev6.h>
  19
  20 #include "err_impl.h"
  21 #include "proto.h"
  22
  23 static int
  24 ev6_parse_ibox(u64 i_stat, int print)
  25 {
  26         int status = MCHK_DISPOSITION_REPORT;
  27
  28 #define EV6__I_STAT__PAR        (1UL << 29)
  29 #define EV6__I_STAT__ERRMASK    (EV6__I_STAT__PAR)
  30
  31         if (!(i_stat & EV6__I_STAT__ERRMASK))
  32                 return MCHK_DISPOSITION_UNKNOWN_ERROR;
  33
  34         if (!print)
  35                 return status;
  36
  37         if (i_stat & EV6__I_STAT__PAR)
  38                 printk("%s    Icache parity error\n", err_print_prefix);
  39
  40         return status;
  41 }
  42
  43 static int
  44 ev6_parse_mbox(u64 mm_stat, u64 d_stat, u64 c_stat, int print)
  45 {
  46         int status = MCHK_DISPOSITION_REPORT;
  47
  48 #define EV6__MM_STAT__DC_TAG_PERR       (1UL << 10)
  49 #define EV6__MM_STAT__ERRMASK           (EV6__MM_STAT__DC_TAG_PERR)
  50 #define EV6__D_STAT__TPERR_P0           (1UL << 0)
  51 #define EV6__D_STAT__TPERR_P1           (1UL << 1)
  52 #define EV6__D_STAT__ECC_ERR_ST         (1UL << 2)
  53 #define EV6__D_STAT__ECC_ERR_LD         (1UL << 3)
  54 #define EV6__D_STAT__SEO                (1UL << 4)
  55 #define EV6__D_STAT__ERRMASK            (EV6__D_STAT__TPERR_P0 |        \
  56                                          EV6__D_STAT__TPERR_P1 |        \
  57                                          EV6__D_STAT__ECC_ERR_ST |      \
  58                                          EV6__D_STAT__ECC_ERR_LD |      \
  59                                          EV6__D_STAT__SEO)
  60
  61         if (!(d_stat & EV6__D_STAT__ERRMASK) &&
  62             !(mm_stat & EV6__MM_STAT__ERRMASK))
  63                 return MCHK_DISPOSITION_UNKNOWN_ERROR;
  64
  65         if (!print)
  66                 return status;
  67
  68         if (mm_stat & EV6__MM_STAT__DC_TAG_PERR)
  69                 printk("%s    Dcache tag parity error on probe\n",
  70                        err_print_prefix);
  71         if (d_stat & EV6__D_STAT__TPERR_P0)
  72                 printk("%s    Dcache tag parity error - pipe 0\n",
  73                        err_print_prefix);
  74         if (d_stat & EV6__D_STAT__TPERR_P1)
  75                 printk("%s    Dcache tag parity error - pipe 1\n",
  76                        err_print_prefix);
  77         if (d_stat & EV6__D_STAT__ECC_ERR_ST)
  78                 printk("%s    ECC error occurred on a store\n",
  79                        err_print_prefix);
  80         if (d_stat & EV6__D_STAT__ECC_ERR_LD)
  81                 printk("%s    ECC error occurred on a %s load\n",
  82                        err_print_prefix,
  83                        c_stat ? "" : "speculative ");
  84         if (d_stat & EV6__D_STAT__SEO)
  85                 printk("%s    Dcache second error\n", err_print_prefix);
  86
  87         return status;
  88 }
  89
  90 static int
  91 ev6_parse_cbox(u64 c_addr, u64 c1_syn, u64 c2_syn,
  92                u64 c_stat, u64 c_sts, int print)
  93 {
  94         char *sourcename[] = { "UNKNOWN", "UNKNOWN", "UNKNOWN",
  95                                "MEMORY", "BCACHE", "DCACHE",
  96                                "BCACHE PROBE", "BCACHE PROBE" };
  97         char *streamname[] = { "D", "I" };
  98         char *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%016lx\n"
 162                  "    Syndrome[upper.lower]: %02lx.%02lx\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
 179 void
 180 ev6_register_error_handlers(void)
 181 {
 182         /* None right now. */
 183 }
 184
 185 int
 186 ev6_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
 232 void
 233 ev6_machine_check(u64 vector, u64 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