| /* |
| * 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/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 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", |
| (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)); |
| |
| #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); |