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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
228 lines
6.9 KiB
C
228 lines
6.9 KiB
C
// 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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