229 lines
6.9 KiB
C
229 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (C) 2002,2003 Broadcom Corporation
|
|
*/
|
|
|
|
/*
|
|
* The Bus Watcher monitors internal bus transactions and maintains
|
|
* counts of transactions with error status, logging details and
|
|
* causing one of several interrupts. This driver provides a handler
|
|
* for those interrupts which aggregates the counts (to avoid
|
|
* saturating the 8-bit counters) and provides a presence in
|
|
* /proc/bus_watcher if PROC_FS is on.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <asm/io.h>
|
|
|
|
#include <asm/sibyte/sb1250.h>
|
|
#include <asm/sibyte/sb1250_regs.h>
|
|
#include <asm/sibyte/sb1250_int.h>
|
|
#include <asm/sibyte/sb1250_scd.h>
|
|
#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
|
|
#include <asm/sibyte/bcm1480_regs.h>
|
|
#endif
|
|
|
|
|
|
struct bw_stats_struct {
|
|
uint64_t status;
|
|
uint32_t l2_err;
|
|
uint32_t memio_err;
|
|
int status_printed;
|
|
unsigned long l2_cor_d;
|
|
unsigned long l2_bad_d;
|
|
unsigned long l2_cor_t;
|
|
unsigned long l2_bad_t;
|
|
unsigned long mem_cor_d;
|
|
unsigned long mem_bad_d;
|
|
unsigned long bus_error;
|
|
} bw_stats;
|
|
|
|
|
|
static void print_summary(uint32_t status, uint32_t l2_err,
|
|
uint32_t memio_err)
|
|
{
|
|
printk("Bus watcher error counters: %08x %08x\n", l2_err, memio_err);
|
|
printk("\nLast recorded signature:\n");
|
|
printk("Request %02x from %d, answered by %d with Dcode %d\n",
|
|
(unsigned int)(G_SCD_BERR_TID(status) & 0x3f),
|
|
(int)(G_SCD_BERR_TID(status) >> 6),
|
|
(int)G_SCD_BERR_RID(status),
|
|
(int)G_SCD_BERR_DCODE(status));
|
|
}
|
|
|
|
/*
|
|
* check_bus_watcher is exported for use in situations where we want
|
|
* to see the most recent status of the bus watcher, which might have
|
|
* already been destructively read out of the registers.
|
|
*
|
|
* notes: this is currently used by the cache error handler
|
|
* should provide locking against the interrupt handler
|
|
*/
|
|
void check_bus_watcher(void)
|
|
{
|
|
u32 status, l2_err, memio_err;
|
|
|
|
#if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
|
|
/* Use non-destructive register */
|
|
status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS_DEBUG));
|
|
#elif defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
|
|
/* Use non-destructive register */
|
|
/* Same as 1250 except BUS_ERR_STATUS_DEBUG is in a different place. */
|
|
status = csr_in32(IOADDR(A_BCM1480_BUS_ERR_STATUS_DEBUG));
|
|
#else
|
|
#error bus watcher being built for unknown Sibyte SOC!
|
|
#endif
|
|
if (!(status & 0x7fffffff)) {
|
|
printk("Using last values reaped by bus watcher driver\n");
|
|
status = bw_stats.status;
|
|
l2_err = bw_stats.l2_err;
|
|
memio_err = bw_stats.memio_err;
|
|
} else {
|
|
l2_err = csr_in32(IOADDR(A_BUS_L2_ERRORS));
|
|
memio_err = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS));
|
|
}
|
|
if (status & ~(1UL << 31))
|
|
print_summary(status, l2_err, memio_err);
|
|
else
|
|
printk("Bus watcher indicates no error\n");
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
/* For simplicity, I want to assume a single read is required each
|
|
time */
|
|
static int bw_proc_show(struct seq_file *m, void *v)
|
|
{
|
|
struct bw_stats_struct *stats = m->private;
|
|
|
|
seq_puts(m, "SiByte Bus Watcher statistics\n");
|
|
seq_puts(m, "-----------------------------\n");
|
|
seq_printf(m, "L2-d-cor %8ld\nL2-d-bad %8ld\n",
|
|
stats->l2_cor_d, stats->l2_bad_d);
|
|
seq_printf(m, "L2-t-cor %8ld\nL2-t-bad %8ld\n",
|
|
stats->l2_cor_t, stats->l2_bad_t);
|
|
seq_printf(m, "MC-d-cor %8ld\nMC-d-bad %8ld\n",
|
|
stats->mem_cor_d, stats->mem_bad_d);
|
|
seq_printf(m, "IO-err %8ld\n", stats->bus_error);
|
|
seq_puts(m, "\nLast recorded signature:\n");
|
|
seq_printf(m, "Request %02x from %d, answered by %d with Dcode %d\n",
|
|
(unsigned int)(G_SCD_BERR_TID(stats->status) & 0x3f),
|
|
(int)(G_SCD_BERR_TID(stats->status) >> 6),
|
|
(int)G_SCD_BERR_RID(stats->status),
|
|
(int)G_SCD_BERR_DCODE(stats->status));
|
|
/* XXXKW indicate multiple errors between printings, or stats
|
|
collection (or both)? */
|
|
if (stats->status & M_SCD_BERR_MULTERRS)
|
|
seq_puts(m, "Multiple errors observed since last check.\n");
|
|
if (stats->status_printed) {
|
|
seq_puts(m, "(no change since last printing)\n");
|
|
} else {
|
|
stats->status_printed = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void create_proc_decoder(struct bw_stats_struct *stats)
|
|
{
|
|
struct proc_dir_entry *ent;
|
|
|
|
ent = proc_create_single_data("bus_watcher", S_IWUSR | S_IRUGO, NULL,
|
|
bw_proc_show, stats);
|
|
if (!ent) {
|
|
printk(KERN_INFO "Unable to initialize bus_watcher /proc entry\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/*
|
|
* sibyte_bw_int - handle bus watcher interrupts and accumulate counts
|
|
*
|
|
* notes: possible re-entry due to multiple sources
|
|
* should check/indicate saturation
|
|
*/
|
|
static irqreturn_t sibyte_bw_int(int irq, void *data)
|
|
{
|
|
struct bw_stats_struct *stats = data;
|
|
unsigned long cntr;
|
|
#ifdef CONFIG_SIBYTE_BW_TRACE
|
|
int i;
|
|
#endif
|
|
|
|
#ifdef CONFIG_SIBYTE_BW_TRACE
|
|
csr_out32(M_SCD_TRACE_CFG_FREEZE, IOADDR(A_SCD_TRACE_CFG));
|
|
csr_out32(M_SCD_TRACE_CFG_START_READ, IOADDR(A_SCD_TRACE_CFG));
|
|
|
|
for (i=0; i<256*6; i++)
|
|
printk("%016llx\n",
|
|
(long long)__raw_readq(IOADDR(A_SCD_TRACE_READ)));
|
|
|
|
csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
|
|
csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG));
|
|
#endif
|
|
|
|
/* Destructive read, clears register and interrupt */
|
|
stats->status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS));
|
|
stats->status_printed = 0;
|
|
|
|
stats->l2_err = cntr = csr_in32(IOADDR(A_BUS_L2_ERRORS));
|
|
stats->l2_cor_d += G_SCD_L2ECC_CORR_D(cntr);
|
|
stats->l2_bad_d += G_SCD_L2ECC_BAD_D(cntr);
|
|
stats->l2_cor_t += G_SCD_L2ECC_CORR_T(cntr);
|
|
stats->l2_bad_t += G_SCD_L2ECC_BAD_T(cntr);
|
|
csr_out32(0, IOADDR(A_BUS_L2_ERRORS));
|
|
|
|
stats->memio_err = cntr = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS));
|
|
stats->mem_cor_d += G_SCD_MEM_ECC_CORR(cntr);
|
|
stats->mem_bad_d += G_SCD_MEM_ECC_BAD(cntr);
|
|
stats->bus_error += G_SCD_MEM_BUSERR(cntr);
|
|
csr_out32(0, IOADDR(A_BUS_MEM_IO_ERRORS));
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
int __init sibyte_bus_watcher(void)
|
|
{
|
|
memset(&bw_stats, 0, sizeof(struct bw_stats_struct));
|
|
bw_stats.status_printed = 1;
|
|
|
|
if (request_irq(K_INT_BAD_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
|
|
printk("Failed to register bus watcher BAD_ECC irq\n");
|
|
return -1;
|
|
}
|
|
if (request_irq(K_INT_COR_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
|
|
free_irq(K_INT_BAD_ECC, &bw_stats);
|
|
printk("Failed to register bus watcher COR_ECC irq\n");
|
|
return -1;
|
|
}
|
|
if (request_irq(K_INT_IO_BUS, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
|
|
free_irq(K_INT_BAD_ECC, &bw_stats);
|
|
free_irq(K_INT_COR_ECC, &bw_stats);
|
|
printk("Failed to register bus watcher IO_BUS irq\n");
|
|
return -1;
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
create_proc_decoder(&bw_stats);
|
|
#endif
|
|
|
|
#ifdef CONFIG_SIBYTE_BW_TRACE
|
|
csr_out32((M_SCD_TRSEQ_ASAMPLE | M_SCD_TRSEQ_DSAMPLE |
|
|
K_SCD_TRSEQ_TRIGGER_ALL),
|
|
IOADDR(A_SCD_TRACE_SEQUENCE_0));
|
|
csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
|
|
csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG));
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(sibyte_bus_watcher);
|