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Diffstat (limited to 'arch/mips/sibyte/sb1250/bus_watcher.c')
-rw-r--r--arch/mips/sibyte/sb1250/bus_watcher.c259
1 files changed, 259 insertions, 0 deletions
diff --git a/arch/mips/sibyte/sb1250/bus_watcher.c b/arch/mips/sibyte/sb1250/bus_watcher.c
new file mode 100644
index 000000000000..182a16f42e2d
--- /dev/null
+++ b/arch/mips/sibyte/sb1250/bus_watcher.c
@@ -0,0 +1,259 @@
+/*
+ * Copyright (C) 2002,2003 Broadcom Corporation
+ *
+ * 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.
+ */
+
+/*
+ * 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/config.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <asm/system.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>
+
+
+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;
+
+#ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
+ /* Destructive read, clears register and interrupt */
+ status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS));
+#else
+ /* Use non-destructive register */
+ status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS_DEBUG));
+#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");
+}
+
+static int bw_print_buffer(char *page, struct bw_stats_struct *stats)
+{
+ int len;
+
+ len = sprintf(page, "SiByte Bus Watcher statistics\n");
+ len += sprintf(page+len, "-----------------------------\n");
+ len += sprintf(page+len, "L2-d-cor %8ld\nL2-d-bad %8ld\n",
+ stats->l2_cor_d, stats->l2_bad_d);
+ len += sprintf(page+len, "L2-t-cor %8ld\nL2-t-bad %8ld\n",
+ stats->l2_cor_t, stats->l2_bad_t);
+ len += sprintf(page+len, "MC-d-cor %8ld\nMC-d-bad %8ld\n",
+ stats->mem_cor_d, stats->mem_bad_d);
+ len += sprintf(page+len, "IO-err %8ld\n", stats->bus_error);
+ len += sprintf(page+len, "\nLast recorded signature:\n");
+ len += sprintf(page+len, "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)
+ len += sprintf(page+len, "Multiple errors observed since last check.\n");
+ if (stats->status_printed) {
+ len += sprintf(page+len, "(no change since last printing)\n");
+ } else {
+ stats->status_printed = 1;
+ }
+
+ return len;
+}
+
+#ifdef CONFIG_PROC_FS
+
+/* For simplicity, I want to assume a single read is required each
+ time */
+static int bw_read_proc(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ int len;
+
+ if (off == 0) {
+ len = bw_print_buffer(page, data);
+ *start = page;
+ } else {
+ len = 0;
+ *eof = 1;
+ }
+ return len;
+}
+
+static void create_proc_decoder(struct bw_stats_struct *stats)
+{
+ struct proc_dir_entry *ent;
+
+ ent = create_proc_read_entry("bus_watcher", S_IWUSR | S_IRUGO, NULL,
+ bw_read_proc, 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 pt_regs *regs)
+{
+ struct bw_stats_struct *stats = data;
+ unsigned long cntr;
+#ifdef CONFIG_SIBYTE_BW_TRACE
+ int i;
+#endif
+#ifndef CONFIG_PROC_FS
+ char bw_buf[1024];
+#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",
+ (unsigned long long)bus_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));
+
+#ifndef CONFIG_PROC_FS
+ bw_print_buffer(bw_buf, stats);
+ printk(bw_buf);
+#endif
+
+ 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;
+}
+
+__initcall(sibyte_bus_watcher);