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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/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
  22 static int
  23 ev6_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
  42 static int
  43 ev6_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
  89 static int
  90 ev6_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%016lx\n"
 161                  "    Syndrome[upper.lower]: %02lx.%02lx\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
 178 void
 179 ev6_register_error_handlers(void)
 180 {
 181         /* None right now. */
 182 }
 183
 184 int
 185 ev6_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
 231 void
 232 ev6_machine_check(u64 vector, u64 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