LXR linux/arch/alpha/kernel/err

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *      linux/arch/alpha/kernel/err_ev6.c
   4 *
   5 *      Copyright (C) 2000 Jeff Wiedemeier (Compaq Computer Corporation)
   6 *
   7 *      Error handling code supporting Alpha systems
   8 */
   9
  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        static const char * const sourcename[] = {
  94                "UNKNOWN", "UNKNOWN", "UNKNOWN",
  95                "MEMORY", "BCACHE", "DCACHE",
  96                "BCACHE PROBE", "BCACHE PROBE"
  97        };
  98        static const char * const streamname[] = { "D", "I" };
  99        static const char * const bitsname[] = { "SINGLE", "DOUBLE" };
 100        int status = MCHK_DISPOSITION_REPORT;
 101        int source = -1, stream = -1, bits = -1;
 102
 103#define EV6__C_STAT__BC_PERR            (0x01)
 104#define EV6__C_STAT__DC_PERR            (0x02)
 105#define EV6__C_STAT__DSTREAM_MEM_ERR    (0x03)
 106#define EV6__C_STAT__DSTREAM_BC_ERR     (0x04)
 107#define EV6__C_STAT__DSTREAM_DC_ERR     (0x05)
 108#define EV6__C_STAT__PROBE_BC_ERR0      (0x06)  /* both 6 and 7 indicate... */
 109#define EV6__C_STAT__PROBE_BC_ERR1      (0x07)  /* ...probe bc error.       */
 110#define EV6__C_STAT__ISTREAM_MEM_ERR    (0x0B)
 111#define EV6__C_STAT__ISTREAM_BC_ERR     (0x0C)
 112#define EV6__C_STAT__DSTREAM_MEM_DBL    (0x13)
 113#define EV6__C_STAT__DSTREAM_BC_DBL     (0x14)
 114#define EV6__C_STAT__ISTREAM_MEM_DBL    (0x1B)
 115#define EV6__C_STAT__ISTREAM_BC_DBL     (0x1C)
 116#define EV6__C_STAT__SOURCE_MEMORY      (0x03)
 117#define EV6__C_STAT__SOURCE_BCACHE      (0x04)
 118#define EV6__C_STAT__SOURCE__S          (0)
 119#define EV6__C_STAT__SOURCE__M          (0x07)
 120#define EV6__C_STAT__ISTREAM__S         (3)
 121#define EV6__C_STAT__ISTREAM__M         (0x01)
 122#define EV6__C_STAT__DOUBLE__S          (4)
 123#define EV6__C_STAT__DOUBLE__M          (0x01)
 124#define EV6__C_STAT__ERRMASK            (0x1F)
 125#define EV6__C_STS__SHARED              (1 << 0)
 126#define EV6__C_STS__DIRTY               (1 << 1)
 127#define EV6__C_STS__VALID               (1 << 2)
 128#define EV6__C_STS__PARITY              (1 << 3)
 129
 130        if (!(c_stat & EV6__C_STAT__ERRMASK))
 131                return MCHK_DISPOSITION_UNKNOWN_ERROR;
 132
 133        if (!print)
 134                return status;
 135
 136        source = EXTRACT(c_stat, EV6__C_STAT__SOURCE);
 137        stream = EXTRACT(c_stat, EV6__C_STAT__ISTREAM);
 138        bits = EXTRACT(c_stat, EV6__C_STAT__DOUBLE);
 139
 140        if (c_stat & EV6__C_STAT__BC_PERR) {
 141                printk("%s    Bcache tag parity error\n", err_print_prefix);
 142                source = -1;
 143        }
 144
 145        if (c_stat & EV6__C_STAT__DC_PERR) {
 146                printk("%s    Dcache tag parity error\n", err_print_prefix);
 147                source = -1;
 148        }
 149
 150        if (c_stat == EV6__C_STAT__PROBE_BC_ERR0 ||
 151            c_stat == EV6__C_STAT__PROBE_BC_ERR1) {
 152                printk("%s    Bcache single-bit error on a probe hit\n",
 153                       err_print_prefix);
 154                source = -1;
 155        }
 156
 157        if (source != -1) 
 158                printk("%s    %s-STREAM %s-BIT ECC error from %s\n",
 159                       err_print_prefix,
 160                       streamname[stream], bitsname[bits], sourcename[source]);
 161
 162        printk("%s    Address: 0x%016llx\n"
 163                 "    Syndrome[upper.lower]: %02llx.%02llx\n",
 164               err_print_prefix,
 165               c_addr,
 166               c2_syn, c1_syn);
 167
 168        if (source == EV6__C_STAT__SOURCE_MEMORY ||
 169            source == EV6__C_STAT__SOURCE_BCACHE) 
 170                printk("%s    Block status: %s%s%s%s\n",
 171                       err_print_prefix,
 172                       (c_sts & EV6__C_STS__SHARED) ? "SHARED " : "",
 173                       (c_sts & EV6__C_STS__DIRTY)  ? "DIRTY "  : "",
 174                       (c_sts & EV6__C_STS__VALID)  ? "VALID "  : "",
 175                       (c_sts & EV6__C_STS__PARITY) ? "PARITY " : "");
 176                
 177        return status;
 178}
 179
 180void
 181ev6_register_error_handlers(void)
 182{
 183        /* None right now. */
 184}
 185
 186int
 187ev6_process_logout_frame(struct el_common *mchk_header, int print)
 188{
 189        struct el_common_EV6_mcheck *ev6mchk = 
 190                (struct el_common_EV6_mcheck *)mchk_header;
 191        int status = MCHK_DISPOSITION_UNKNOWN_ERROR;
 192
 193        status |= ev6_parse_ibox(ev6mchk->I_STAT, print);
 194        status |= ev6_parse_mbox(ev6mchk->MM_STAT, ev6mchk->DC_STAT, 
 195                                 ev6mchk->C_STAT, print);
 196        status |= ev6_parse_cbox(ev6mchk->C_ADDR, ev6mchk->DC1_SYNDROME,
 197                                 ev6mchk->DC0_SYNDROME, ev6mchk->C_STAT,
 198                                 ev6mchk->C_STS, print);
 199
 200        if (!print)
 201                return status;
 202
 203        if (status != MCHK_DISPOSITION_DISMISS) {
 204                char *saved_err_prefix = err_print_prefix;
 205
 206                /*
 207                 * Dump some additional information from the frame
 208                 */
 209                printk("%s    EXC_ADDR: 0x%016lx   IER_CM: 0x%016lx"
 210                            "   ISUM: 0x%016lx\n"
 211                         "    PAL_BASE: 0x%016lx   I_CTL:  0x%016lx"
 212                            "   PCTX: 0x%016lx\n",
 213                       err_print_prefix,
 214                       ev6mchk->EXC_ADDR, ev6mchk->IER_CM, ev6mchk->ISUM,
 215                       ev6mchk->PAL_BASE, ev6mchk->I_CTL, ev6mchk->PCTX);
 216
 217                if (status == MCHK_DISPOSITION_UNKNOWN_ERROR) {
 218                        printk("%s    UNKNOWN error, frame follows:\n",
 219                               err_print_prefix);
 220                } else {
 221                        /* had decode -- downgrade print level for frame */
 222                        err_print_prefix = KERN_NOTICE;
 223                }
 224
 225                mchk_dump_logout_frame(mchk_header);
 226
 227                err_print_prefix = saved_err_prefix;
 228        }
 229
 230        return status;
 231}
 232
 233void
 234ev6_machine_check(unsigned long vector, unsigned long la_ptr)
 235{
 236        struct el_common *mchk_header = (struct el_common *)la_ptr;
 237
 238        /*
 239         * Sync the processor
 240         */
 241        mb();
 242        draina();
 243
 244        /*
 245         * Parse the logout frame without printing first. If the only error(s)
 246         * found are have a disposition of "dismiss", then just dismiss them
 247         * and don't print any message
 248         */
 249        if (ev6_process_logout_frame(mchk_header, 0) != 
 250            MCHK_DISPOSITION_DISMISS) {
 251                char *saved_err_prefix = err_print_prefix;
 252                err_print_prefix = KERN_CRIT;
 253
 254                /*
 255                 * Either a nondismissable error was detected or no
 256                 * recognized error was detected  in the logout frame 
 257                 * -- report the error in either case
 258                 */
 259                printk("%s*CPU %s Error (Vector 0x%x) reported on CPU %d:\n", 
 260                       err_print_prefix,
 261                       (vector == SCB_Q_PROCERR)?"Correctable":"Uncorrectable",
 262                       (unsigned int)vector, (int)smp_processor_id());
 263                
 264                ev6_process_logout_frame(mchk_header, 1);
 265                dik_show_regs(get_irq_regs(), NULL);
 266
 267                err_print_prefix = saved_err_prefix;
 268        }
 269
 270        /* 
 271         * Release the logout frame 
 272         */
 273        wrmces(0x7);
 274        mb();
 275}
 276
 277