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