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err_ev6.c

/*
 *    linux/arch/alpha/kernel/err_ev6.c
 *
 *    Copyright (C) 2000 Jeff Wiedemeier (Compaq Computer Corporation)
 *
 *    Error handling code supporting Alpha systems
 */

#include <linux/init.h>
#include <linux/sched.h>

#include <asm/io.h>
#include <asm/irq_regs.h>
#include <asm/hwrpb.h>
#include <asm/smp.h>
#include <asm/err_common.h>
#include <asm/err_ev6.h>

#include "err_impl.h"
#include "proto.h"

static int
ev6_parse_ibox(u64 i_stat, int print)
{
      int status = MCHK_DISPOSITION_REPORT;

#define EV6__I_STAT__PAR      (1UL << 29)
#define EV6__I_STAT__ERRMASK  (EV6__I_STAT__PAR)

      if (!(i_stat & EV6__I_STAT__ERRMASK))
            return MCHK_DISPOSITION_UNKNOWN_ERROR;

      if (!print)
            return status;

      if (i_stat & EV6__I_STAT__PAR)
            printk("%s    Icache parity error\n", err_print_prefix);

      return status;
}

static int
ev6_parse_mbox(u64 mm_stat, u64 d_stat, u64 c_stat, int print)
{
      int status = MCHK_DISPOSITION_REPORT;

#define EV6__MM_STAT__DC_TAG_PERR   (1UL << 10)
#define EV6__MM_STAT__ERRMASK       (EV6__MM_STAT__DC_TAG_PERR)
#define EV6__D_STAT__TPERR_P0       (1UL << 0)
#define EV6__D_STAT__TPERR_P1       (1UL << 1)
#define EV6__D_STAT__ECC_ERR_ST           (1UL << 2)
#define EV6__D_STAT__ECC_ERR_LD           (1UL << 3)
#define EV6__D_STAT__SEO            (1UL << 4)
#define EV6__D_STAT__ERRMASK        (EV6__D_STAT__TPERR_P0 |      \
                                         EV6__D_STAT__TPERR_P1 |  \
                                         EV6__D_STAT__ECC_ERR_ST |      \
                                         EV6__D_STAT__ECC_ERR_LD |      \
                                         EV6__D_STAT__SEO)

      if (!(d_stat & EV6__D_STAT__ERRMASK) && 
          !(mm_stat & EV6__MM_STAT__ERRMASK))
            return MCHK_DISPOSITION_UNKNOWN_ERROR;

      if (!print)
            return status;

      if (mm_stat & EV6__MM_STAT__DC_TAG_PERR)
            printk("%s    Dcache tag parity error on probe\n",
                   err_print_prefix);
      if (d_stat & EV6__D_STAT__TPERR_P0)
            printk("%s    Dcache tag parity error - pipe 0\n",
                   err_print_prefix);
      if (d_stat & EV6__D_STAT__TPERR_P1)
            printk("%s    Dcache tag parity error - pipe 1\n",
                   err_print_prefix);
      if (d_stat & EV6__D_STAT__ECC_ERR_ST)
            printk("%s    ECC error occurred on a store\n", 
                   err_print_prefix);
      if (d_stat & EV6__D_STAT__ECC_ERR_LD)
            printk("%s    ECC error occurred on a %s load\n",
                   err_print_prefix,
                   c_stat ? "" : "speculative ");
      if (d_stat & EV6__D_STAT__SEO)
            printk("%s    Dcache second error\n", err_print_prefix);

      return status;
}

static int
ev6_parse_cbox(u64 c_addr, u64 c1_syn, u64 c2_syn, 
             u64 c_stat, u64 c_sts, int print)
{
      char *sourcename[] = { "UNKNOWN", "UNKNOWN", "UNKNOWN",
                         "MEMORY", "BCACHE", "DCACHE", 
                         "BCACHE PROBE", "BCACHE PROBE" };
      char *streamname[] = { "D", "I" };
      char *bitsname[] = { "SINGLE", "DOUBLE" };
      int status = MCHK_DISPOSITION_REPORT;
      int source = -1, stream = -1, bits = -1;

#define EV6__C_STAT__BC_PERR        (0x01)
#define EV6__C_STAT__DC_PERR        (0x02)
#define EV6__C_STAT__DSTREAM_MEM_ERR      (0x03)
#define EV6__C_STAT__DSTREAM_BC_ERR (0x04)
#define EV6__C_STAT__DSTREAM_DC_ERR (0x05)
#define EV6__C_STAT__PROBE_BC_ERR0  (0x06)      /* both 6 and 7 indicate... */
#define EV6__C_STAT__PROBE_BC_ERR1  (0x07)      /* ...probe bc error.       */
#define EV6__C_STAT__ISTREAM_MEM_ERR      (0x0B)
#define EV6__C_STAT__ISTREAM_BC_ERR (0x0C)
#define EV6__C_STAT__DSTREAM_MEM_DBL      (0x13)
#define EV6__C_STAT__DSTREAM_BC_DBL (0x14)
#define EV6__C_STAT__ISTREAM_MEM_DBL      (0x1B)
#define EV6__C_STAT__ISTREAM_BC_DBL (0x1C)
#define EV6__C_STAT__SOURCE_MEMORY  (0x03)
#define EV6__C_STAT__SOURCE_BCACHE  (0x04)
#define EV6__C_STAT__SOURCE__S            (0)
#define EV6__C_STAT__SOURCE__M            (0x07)
#define EV6__C_STAT__ISTREAM__S           (3)
#define EV6__C_STAT__ISTREAM__M           (0x01)
#define EV6__C_STAT__DOUBLE__S            (4)
#define EV6__C_STAT__DOUBLE__M            (0x01)
#define EV6__C_STAT__ERRMASK        (0x1F)
#define EV6__C_STS__SHARED          (1 << 0)
#define EV6__C_STS__DIRTY           (1 << 1)
#define EV6__C_STS__VALID           (1 << 2)
#define EV6__C_STS__PARITY          (1 << 3)

      if (!(c_stat & EV6__C_STAT__ERRMASK))
            return MCHK_DISPOSITION_UNKNOWN_ERROR;

      if (!print)
            return status;

      source = EXTRACT(c_stat, EV6__C_STAT__SOURCE);
      stream = EXTRACT(c_stat, EV6__C_STAT__ISTREAM);
      bits = EXTRACT(c_stat, EV6__C_STAT__DOUBLE);

      if (c_stat & EV6__C_STAT__BC_PERR) {
            printk("%s    Bcache tag parity error\n", err_print_prefix);
            source = -1;
      }

      if (c_stat & EV6__C_STAT__DC_PERR) {
            printk("%s    Dcache tag parity error\n", err_print_prefix);
            source = -1;
      }

      if (c_stat == EV6__C_STAT__PROBE_BC_ERR0 ||
          c_stat == EV6__C_STAT__PROBE_BC_ERR1) {
            printk("%s    Bcache single-bit error on a probe hit\n",
                   err_print_prefix);
            source = -1;
      }

      if (source != -1) 
            printk("%s    %s-STREAM %s-BIT ECC error from %s\n",
                   err_print_prefix,
                   streamname[stream], bitsname[bits], sourcename[source]);

      printk("%s    Address: 0x%016llx\n"
               "    Syndrome[upper.lower]: %02llx.%02llx\n",
             err_print_prefix,
             c_addr,
             c2_syn, c1_syn);

      if (source == EV6__C_STAT__SOURCE_MEMORY ||
          source == EV6__C_STAT__SOURCE_BCACHE) 
            printk("%s    Block status: %s%s%s%s\n",
                   err_print_prefix,
                   (c_sts & EV6__C_STS__SHARED) ? "SHARED " : "",
                   (c_sts & EV6__C_STS__DIRTY)  ? "DIRTY "  : "",
                   (c_sts & EV6__C_STS__VALID)  ? "VALID "  : "",
                   (c_sts & EV6__C_STS__PARITY) ? "PARITY " : "");
            
      return status;
}

void
ev6_register_error_handlers(void)
{
      /* None right now. */
}

int
ev6_process_logout_frame(struct el_common *mchk_header, int print)
{
      struct el_common_EV6_mcheck *ev6mchk = 
            (struct el_common_EV6_mcheck *)mchk_header;
      int status = MCHK_DISPOSITION_UNKNOWN_ERROR;

      status |= ev6_parse_ibox(ev6mchk->I_STAT, print);
      status |= ev6_parse_mbox(ev6mchk->MM_STAT, ev6mchk->DC_STAT, 
                         ev6mchk->C_STAT, print);
      status |= ev6_parse_cbox(ev6mchk->C_ADDR, ev6mchk->DC1_SYNDROME,
                         ev6mchk->DC0_SYNDROME, ev6mchk->C_STAT,
                         ev6mchk->C_STS, print);

      if (!print)
            return status;

      if (status != MCHK_DISPOSITION_DISMISS) {
            char *saved_err_prefix = err_print_prefix;

            /*
             * Dump some additional information from the frame
             */
            printk("%s    EXC_ADDR: 0x%016lx   IER_CM: 0x%016lx"
                        "   ISUM: 0x%016lx\n"
                     "    PAL_BASE: 0x%016lx   I_CTL:  0x%016lx"
                        "   PCTX: 0x%016lx\n",
                   err_print_prefix,
                   ev6mchk->EXC_ADDR, ev6mchk->IER_CM, ev6mchk->ISUM,
                   ev6mchk->PAL_BASE, ev6mchk->I_CTL, ev6mchk->PCTX);

            if (status == MCHK_DISPOSITION_UNKNOWN_ERROR) {
                  printk("%s    UNKNOWN error, frame follows:\n",
                         err_print_prefix);
            } else {
                  /* had decode -- downgrade print level for frame */
                  err_print_prefix = KERN_NOTICE;
            }

            mchk_dump_logout_frame(mchk_header);

            err_print_prefix = saved_err_prefix;
      }

      return status;
}

void
ev6_machine_check(unsigned long vector, unsigned long la_ptr)
{
      struct el_common *mchk_header = (struct el_common *)la_ptr;

      /*
       * Sync the processor
       */
      mb();
      draina();

      /*
       * Parse the logout frame without printing first. If the only error(s)
       * found are have a disposition of "dismiss", then just dismiss them
       * and don't print any message
       */
      if (ev6_process_logout_frame(mchk_header, 0) != 
          MCHK_DISPOSITION_DISMISS) {
            char *saved_err_prefix = err_print_prefix;
            err_print_prefix = KERN_CRIT;

            /*
             * Either a nondismissable error was detected or no
             * recognized error was detected  in the logout frame 
             * -- report the error in either case
             */
            printk("%s*CPU %s Error (Vector 0x%x) reported on CPU %d:\n", 
                   err_print_prefix,
                   (vector == SCB_Q_PROCERR)?"Correctable":"Uncorrectable",
                   (unsigned int)vector, (int)smp_processor_id());
            
            ev6_process_logout_frame(mchk_header, 1);
            dik_show_regs(get_irq_regs(), NULL);

            err_print_prefix = saved_err_prefix;
      }

      /* 
       * Release the logout frame 
       */
      wrmces(0x7);
      mb();
}


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