// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/alpha/kernel/err_ev6.c
*
* Copyright (C) 2000 Jeff Wiedemeier (Compaq Computer Corporation)
*
* Error handling code supporting Alpha systems
*/
#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)
{
static const char * const sourcename[] = {
"UNKNOWN", "UNKNOWN", "UNKNOWN",
"MEMORY", "BCACHE", "DCACHE",
"BCACHE PROBE", "BCACHE PROBE"
};
static const char * const streamname[] = { "D", "I" };
static const char * const 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();
}