1/* 2 * Copyright (C) 2002,2003 Broadcom Corporation 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 2 7 * of the License, or (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 17 */ 18 19/* 20 * The Bus Watcher monitors internal bus transactions and maintains 21 * counts of transactions with error status, logging details and 22 * causing one of several interrupts. This driver provides a handler 23 * for those interrupts which aggregates the counts (to avoid 24 * saturating the 8-bit counters) and provides a presence in 25 * /proc/bus_watcher if PROC_FS is on. 26 */ 27 28#include <linux/init.h> 29#include <linux/kernel.h> 30#include <linux/interrupt.h> 31#include <linux/sched.h> 32#include <linux/proc_fs.h> 33#include <linux/seq_file.h> 34#include <asm/io.h> 35 36#include <asm/sibyte/sb1250.h> 37#include <asm/sibyte/sb1250_regs.h> 38#include <asm/sibyte/sb1250_int.h> 39#include <asm/sibyte/sb1250_scd.h> 40#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80) 41#include <asm/sibyte/bcm1480_regs.h> 42#endif 43 44 45struct bw_stats_struct { 46 uint64_t status; 47 uint32_t l2_err; 48 uint32_t memio_err; 49 int status_printed; 50 unsigned long l2_cor_d; 51 unsigned long l2_bad_d; 52 unsigned long l2_cor_t; 53 unsigned long l2_bad_t; 54 unsigned long mem_cor_d; 55 unsigned long mem_bad_d; 56 unsigned long bus_error; 57} bw_stats; 58 59 60static void print_summary(uint32_t status, uint32_t l2_err, 61 uint32_t memio_err) 62{ 63 printk("Bus watcher error counters: %08x %08x\n", l2_err, memio_err); 64 printk("\nLast recorded signature:\n"); 65 printk("Request %02x from %d, answered by %d with Dcode %d\n", 66 (unsigned int)(G_SCD_BERR_TID(status) & 0x3f), 67 (int)(G_SCD_BERR_TID(status) >> 6), 68 (int)G_SCD_BERR_RID(status), 69 (int)G_SCD_BERR_DCODE(status)); 70} 71 72/* 73 * check_bus_watcher is exported for use in situations where we want 74 * to see the most recent status of the bus watcher, which might have 75 * already been destructively read out of the registers. 76 * 77 * notes: this is currently used by the cache error handler 78 * should provide locking against the interrupt handler 79 */ 80void check_bus_watcher(void) 81{ 82 u32 status, l2_err, memio_err; 83 84#ifdef CONFIG_SB1_PASS_1_WORKAROUNDS 85 /* Destructive read, clears register and interrupt */ 86 status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS)); 87#elif defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250) 88 /* Use non-destructive register */ 89 status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS_DEBUG)); 90#elif defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80) 91 /* Use non-destructive register */ 92 /* Same as 1250 except BUS_ERR_STATUS_DEBUG is in a different place. */ 93 status = csr_in32(IOADDR(A_BCM1480_BUS_ERR_STATUS_DEBUG)); 94#else 95#error bus watcher being built for unknown Sibyte SOC! 96#endif 97 if (!(status & 0x7fffffff)) { 98 printk("Using last values reaped by bus watcher driver\n"); 99 status = bw_stats.status; 100 l2_err = bw_stats.l2_err; 101 memio_err = bw_stats.memio_err; 102 } else { 103 l2_err = csr_in32(IOADDR(A_BUS_L2_ERRORS)); 104 memio_err = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS)); 105 } 106 if (status & ~(1UL << 31)) 107 print_summary(status, l2_err, memio_err); 108 else 109 printk("Bus watcher indicates no error\n"); 110} 111 112#ifdef CONFIG_PROC_FS 113 114/* For simplicity, I want to assume a single read is required each 115 time */ 116static int bw_proc_show(struct seq_file *m, void *v) 117{ 118 struct bw_stats_struct *stats = m->private; 119 120 seq_puts(m, "SiByte Bus Watcher statistics\n"); 121 seq_puts(m, "-----------------------------\n"); 122 seq_printf(m, "L2-d-cor %8ld\nL2-d-bad %8ld\n", 123 stats->l2_cor_d, stats->l2_bad_d); 124 seq_printf(m, "L2-t-cor %8ld\nL2-t-bad %8ld\n", 125 stats->l2_cor_t, stats->l2_bad_t); 126 seq_printf(m, "MC-d-cor %8ld\nMC-d-bad %8ld\n", 127 stats->mem_cor_d, stats->mem_bad_d); 128 seq_printf(m, "IO-err %8ld\n", stats->bus_error); 129 seq_puts(m, "\nLast recorded signature:\n"); 130 seq_printf(m, "Request %02x from %d, answered by %d with Dcode %d\n", 131 (unsigned int)(G_SCD_BERR_TID(stats->status) & 0x3f), 132 (int)(G_SCD_BERR_TID(stats->status) >> 6), 133 (int)G_SCD_BERR_RID(stats->status), 134 (int)G_SCD_BERR_DCODE(stats->status)); 135 /* XXXKW indicate multiple errors between printings, or stats 136 collection (or both)? */ 137 if (stats->status & M_SCD_BERR_MULTERRS) 138 seq_puts(m, "Multiple errors observed since last check.\n"); 139 if (stats->status_printed) { 140 seq_puts(m, "(no change since last printing)\n"); 141 } else { 142 stats->status_printed = 1; 143 } 144 145 return 0; 146} 147 148static int bw_proc_open(struct inode *inode, struct file *file) 149{ 150 return single_open(file, bw_proc_show, PDE_DATA(inode)); 151} 152 153static const struct file_operations bw_proc_fops = { 154 .open = bw_proc_open, 155 .read = seq_read, 156 .llseek = seq_lseek, 157 .release = single_release, 158}; 159 160static void create_proc_decoder(struct bw_stats_struct *stats) 161{ 162 struct proc_dir_entry *ent; 163 164 ent = proc_create_data("bus_watcher", S_IWUSR | S_IRUGO, NULL, 165 &bw_proc_fops, stats); 166 if (!ent) { 167 printk(KERN_INFO "Unable to initialize bus_watcher /proc entry\n"); 168 return; 169 } 170} 171 172#endif /* CONFIG_PROC_FS */ 173 174/* 175 * sibyte_bw_int - handle bus watcher interrupts and accumulate counts 176 * 177 * notes: possible re-entry due to multiple sources 178 * should check/indicate saturation 179 */ 180static irqreturn_t sibyte_bw_int(int irq, void *data) 181{ 182 struct bw_stats_struct *stats = data; 183 unsigned long cntr; 184#ifdef CONFIG_SIBYTE_BW_TRACE 185 int i; 186#endif 187 188#ifdef CONFIG_SIBYTE_BW_TRACE 189 csr_out32(M_SCD_TRACE_CFG_FREEZE, IOADDR(A_SCD_TRACE_CFG)); 190 csr_out32(M_SCD_TRACE_CFG_START_READ, IOADDR(A_SCD_TRACE_CFG)); 191 192 for (i=0; i<256*6; i++) 193 printk("%016llx\n", 194 (long long)__raw_readq(IOADDR(A_SCD_TRACE_READ))); 195 196 csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG)); 197 csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG)); 198#endif 199 200 /* Destructive read, clears register and interrupt */ 201 stats->status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS)); 202 stats->status_printed = 0; 203 204 stats->l2_err = cntr = csr_in32(IOADDR(A_BUS_L2_ERRORS)); 205 stats->l2_cor_d += G_SCD_L2ECC_CORR_D(cntr); 206 stats->l2_bad_d += G_SCD_L2ECC_BAD_D(cntr); 207 stats->l2_cor_t += G_SCD_L2ECC_CORR_T(cntr); 208 stats->l2_bad_t += G_SCD_L2ECC_BAD_T(cntr); 209 csr_out32(0, IOADDR(A_BUS_L2_ERRORS)); 210 211 stats->memio_err = cntr = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS)); 212 stats->mem_cor_d += G_SCD_MEM_ECC_CORR(cntr); 213 stats->mem_bad_d += G_SCD_MEM_ECC_BAD(cntr); 214 stats->bus_error += G_SCD_MEM_BUSERR(cntr); 215 csr_out32(0, IOADDR(A_BUS_MEM_IO_ERRORS)); 216 217 return IRQ_HANDLED; 218} 219 220int __init sibyte_bus_watcher(void) 221{ 222 memset(&bw_stats, 0, sizeof(struct bw_stats_struct)); 223 bw_stats.status_printed = 1; 224 225 if (request_irq(K_INT_BAD_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) { 226 printk("Failed to register bus watcher BAD_ECC irq\n"); 227 return -1; 228 } 229 if (request_irq(K_INT_COR_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) { 230 free_irq(K_INT_BAD_ECC, &bw_stats); 231 printk("Failed to register bus watcher COR_ECC irq\n"); 232 return -1; 233 } 234 if (request_irq(K_INT_IO_BUS, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) { 235 free_irq(K_INT_BAD_ECC, &bw_stats); 236 free_irq(K_INT_COR_ECC, &bw_stats); 237 printk("Failed to register bus watcher IO_BUS irq\n"); 238 return -1; 239 } 240 241#ifdef CONFIG_PROC_FS 242 create_proc_decoder(&bw_stats); 243#endif 244 245#ifdef CONFIG_SIBYTE_BW_TRACE 246 csr_out32((M_SCD_TRSEQ_ASAMPLE | M_SCD_TRSEQ_DSAMPLE | 247 K_SCD_TRSEQ_TRIGGER_ALL), 248 IOADDR(A_SCD_TRACE_SEQUENCE_0)); 249 csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG)); 250 csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG)); 251#endif 252 253 return 0; 254} 255 256__initcall(sibyte_bus_watcher); 257