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 45 struct 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 60 static 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 */ 80 void check_bus_watcher(void) 81 { 82 u32 status, l2_err, memio_err; 83 84 #if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250) 85 /* Use non-destructive register */ 86 status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS_DEBUG)); 87 #elif defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80) 88 /* Use non-destructive register */ 89 /* Same as 1250 except BUS_ERR_STATUS_DEBUG is in a different place. */ 90 status = csr_in32(IOADDR(A_BCM1480_BUS_ERR_STATUS_DEBUG)); 91 #else 92 #error bus watcher being built for unknown Sibyte SOC! 93 #endif 94 if (!(status & 0x7fffffff)) { 95 printk("Using last values reaped by bus watcher driver\n"); 96 status = bw_stats.status; 97 l2_err = bw_stats.l2_err; 98 memio_err = bw_stats.memio_err; 99 } else { 100 l2_err = csr_in32(IOADDR(A_BUS_L2_ERRORS)); 101 memio_err = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS)); 102 } 103 if (status & ~(1UL << 31)) 104 print_summary(status, l2_err, memio_err); 105 else 106 printk("Bus watcher indicates no error\n"); 107 } 108 109 #ifdef CONFIG_PROC_FS 110 111 /* For simplicity, I want to assume a single read is required each 112 time */ 113 static int bw_proc_show(struct seq_file *m, void *v) 114 { 115 struct bw_stats_struct *stats = m->private; 116 117 seq_puts(m, "SiByte Bus Watcher statistics\n"); 118 seq_puts(m, "-----------------------------\n"); 119 seq_printf(m, "L2-d-cor %8ld\nL2-d-bad %8ld\n", 120 stats->l2_cor_d, stats->l2_bad_d); 121 seq_printf(m, "L2-t-cor %8ld\nL2-t-bad %8ld\n", 122 stats->l2_cor_t, stats->l2_bad_t); 123 seq_printf(m, "MC-d-cor %8ld\nMC-d-bad %8ld\n", 124 stats->mem_cor_d, stats->mem_bad_d); 125 seq_printf(m, "IO-err %8ld\n", stats->bus_error); 126 seq_puts(m, "\nLast recorded signature:\n"); 127 seq_printf(m, "Request %02x from %d, answered by %d with Dcode %d\n", 128 (unsigned int)(G_SCD_BERR_TID(stats->status) & 0x3f), 129 (int)(G_SCD_BERR_TID(stats->status) >> 6), 130 (int)G_SCD_BERR_RID(stats->status), 131 (int)G_SCD_BERR_DCODE(stats->status)); 132 /* XXXKW indicate multiple errors between printings, or stats 133 collection (or both)? */ 134 if (stats->status & M_SCD_BERR_MULTERRS) 135 seq_puts(m, "Multiple errors observed since last check.\n"); 136 if (stats->status_printed) { 137 seq_puts(m, "(no change since last printing)\n"); 138 } else { 139 stats->status_printed = 1; 140 } 141 142 return 0; 143 } 144 145 static int bw_proc_open(struct inode *inode, struct file *file) 146 { 147 return single_open(file, bw_proc_show, PDE_DATA(inode)); 148 } 149 150 static const struct file_operations bw_proc_fops = { 151 .open = bw_proc_open, 152 .read = seq_read, 153 .llseek = seq_lseek, 154 .release = single_release, 155 }; 156 157 static void create_proc_decoder(struct bw_stats_struct *stats) 158 { 159 struct proc_dir_entry *ent; 160 161 ent = proc_create_data("bus_watcher", S_IWUSR | S_IRUGO, NULL, 162 &bw_proc_fops, stats); 163 if (!ent) { 164 printk(KERN_INFO "Unable to initialize bus_watcher /proc entry\n"); 165 return; 166 } 167 } 168 169 #endif /* CONFIG_PROC_FS */ 170 171 /* 172 * sibyte_bw_int - handle bus watcher interrupts and accumulate counts 173 * 174 * notes: possible re-entry due to multiple sources 175 * should check/indicate saturation 176 */ 177 static irqreturn_t sibyte_bw_int(int irq, void *data) 178 { 179 struct bw_stats_struct *stats = data; 180 unsigned long cntr; 181 #ifdef CONFIG_SIBYTE_BW_TRACE 182 int i; 183 #endif 184 185 #ifdef CONFIG_SIBYTE_BW_TRACE 186 csr_out32(M_SCD_TRACE_CFG_FREEZE, IOADDR(A_SCD_TRACE_CFG)); 187 csr_out32(M_SCD_TRACE_CFG_START_READ, IOADDR(A_SCD_TRACE_CFG)); 188 189 for (i=0; i<256*6; i++) 190 printk("%016llx\n", 191 (long long)__raw_readq(IOADDR(A_SCD_TRACE_READ))); 192 193 csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG)); 194 csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG)); 195 #endif 196 197 /* Destructive read, clears register and interrupt */ 198 stats->status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS)); 199 stats->status_printed = 0; 200 201 stats->l2_err = cntr = csr_in32(IOADDR(A_BUS_L2_ERRORS)); 202 stats->l2_cor_d += G_SCD_L2ECC_CORR_D(cntr); 203 stats->l2_bad_d += G_SCD_L2ECC_BAD_D(cntr); 204 stats->l2_cor_t += G_SCD_L2ECC_CORR_T(cntr); 205 stats->l2_bad_t += G_SCD_L2ECC_BAD_T(cntr); 206 csr_out32(0, IOADDR(A_BUS_L2_ERRORS)); 207 208 stats->memio_err = cntr = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS)); 209 stats->mem_cor_d += G_SCD_MEM_ECC_CORR(cntr); 210 stats->mem_bad_d += G_SCD_MEM_ECC_BAD(cntr); 211 stats->bus_error += G_SCD_MEM_BUSERR(cntr); 212 csr_out32(0, IOADDR(A_BUS_MEM_IO_ERRORS)); 213 214 return IRQ_HANDLED; 215 } 216 217 int __init sibyte_bus_watcher(void) 218 { 219 memset(&bw_stats, 0, sizeof(struct bw_stats_struct)); 220 bw_stats.status_printed = 1; 221 222 if (request_irq(K_INT_BAD_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) { 223 printk("Failed to register bus watcher BAD_ECC irq\n"); 224 return -1; 225 } 226 if (request_irq(K_INT_COR_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) { 227 free_irq(K_INT_BAD_ECC, &bw_stats); 228 printk("Failed to register bus watcher COR_ECC irq\n"); 229 return -1; 230 } 231 if (request_irq(K_INT_IO_BUS, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) { 232 free_irq(K_INT_BAD_ECC, &bw_stats); 233 free_irq(K_INT_COR_ECC, &bw_stats); 234 printk("Failed to register bus watcher IO_BUS irq\n"); 235 return -1; 236 } 237 238 #ifdef CONFIG_PROC_FS 239 create_proc_decoder(&bw_stats); 240 #endif 241 242 #ifdef CONFIG_SIBYTE_BW_TRACE 243 csr_out32((M_SCD_TRSEQ_ASAMPLE | M_SCD_TRSEQ_DSAMPLE | 244 K_SCD_TRSEQ_TRIGGER_ALL), 245 IOADDR(A_SCD_TRACE_SEQUENCE_0)); 246 csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG)); 247 csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG)); 248 #endif 249 250 return 0; 251 } 252 253 device_initcall(sibyte_bus_watcher); 254