Merge remote-tracking branch 's5p/for-next'
[linux-2.6/next.git] / arch / mips / sibyte / sb1250 / bus_watcher.c
blob45274bd3cd8b8958643cfd7fb1750db0620ad55a
1 /*
2 * Copyright (C) 2002,2003 Broadcom Corporation
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.
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.
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.
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.
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 <asm/system.h>
34 #include <asm/io.h>
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>
42 struct bw_stats_struct {
43 uint64_t status;
44 uint32_t l2_err;
45 uint32_t memio_err;
46 int status_printed;
47 unsigned long l2_cor_d;
48 unsigned long l2_bad_d;
49 unsigned long l2_cor_t;
50 unsigned long l2_bad_t;
51 unsigned long mem_cor_d;
52 unsigned long mem_bad_d;
53 unsigned long bus_error;
54 } bw_stats;
57 static void print_summary(uint32_t status, uint32_t l2_err,
58 uint32_t memio_err)
60 printk("Bus watcher error counters: %08x %08x\n", l2_err, memio_err);
61 printk("\nLast recorded signature:\n");
62 printk("Request %02x from %d, answered by %d with Dcode %d\n",
63 (unsigned int)(G_SCD_BERR_TID(status) & 0x3f),
64 (int)(G_SCD_BERR_TID(status) >> 6),
65 (int)G_SCD_BERR_RID(status),
66 (int)G_SCD_BERR_DCODE(status));
70 * check_bus_watcher is exported for use in situations where we want
71 * to see the most recent status of the bus watcher, which might have
72 * already been destructively read out of the registers.
74 * notes: this is currently used by the cache error handler
75 * should provide locking against the interrupt handler
77 void check_bus_watcher(void)
79 u32 status, l2_err, memio_err;
81 #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
82 /* Destructive read, clears register and interrupt */
83 status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS));
84 #else
85 /* Use non-destructive register */
86 status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS_DEBUG));
87 #endif
88 if (!(status & 0x7fffffff)) {
89 printk("Using last values reaped by bus watcher driver\n");
90 status = bw_stats.status;
91 l2_err = bw_stats.l2_err;
92 memio_err = bw_stats.memio_err;
93 } else {
94 l2_err = csr_in32(IOADDR(A_BUS_L2_ERRORS));
95 memio_err = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS));
97 if (status & ~(1UL << 31))
98 print_summary(status, l2_err, memio_err);
99 else
100 printk("Bus watcher indicates no error\n");
103 static int bw_print_buffer(char *page, struct bw_stats_struct *stats)
105 int len;
107 len = sprintf(page, "SiByte Bus Watcher statistics\n");
108 len += sprintf(page+len, "-----------------------------\n");
109 len += sprintf(page+len, "L2-d-cor %8ld\nL2-d-bad %8ld\n",
110 stats->l2_cor_d, stats->l2_bad_d);
111 len += sprintf(page+len, "L2-t-cor %8ld\nL2-t-bad %8ld\n",
112 stats->l2_cor_t, stats->l2_bad_t);
113 len += sprintf(page+len, "MC-d-cor %8ld\nMC-d-bad %8ld\n",
114 stats->mem_cor_d, stats->mem_bad_d);
115 len += sprintf(page+len, "IO-err %8ld\n", stats->bus_error);
116 len += sprintf(page+len, "\nLast recorded signature:\n");
117 len += sprintf(page+len, "Request %02x from %d, answered by %d with Dcode %d\n",
118 (unsigned int)(G_SCD_BERR_TID(stats->status) & 0x3f),
119 (int)(G_SCD_BERR_TID(stats->status) >> 6),
120 (int)G_SCD_BERR_RID(stats->status),
121 (int)G_SCD_BERR_DCODE(stats->status));
122 /* XXXKW indicate multiple errors between printings, or stats
123 collection (or both)? */
124 if (stats->status & M_SCD_BERR_MULTERRS)
125 len += sprintf(page+len, "Multiple errors observed since last check.\n");
126 if (stats->status_printed) {
127 len += sprintf(page+len, "(no change since last printing)\n");
128 } else {
129 stats->status_printed = 1;
132 return len;
135 #ifdef CONFIG_PROC_FS
137 /* For simplicity, I want to assume a single read is required each
138 time */
139 static int bw_read_proc(char *page, char **start, off_t off,
140 int count, int *eof, void *data)
142 int len;
144 if (off == 0) {
145 len = bw_print_buffer(page, data);
146 *start = page;
147 } else {
148 len = 0;
149 *eof = 1;
151 return len;
154 static void create_proc_decoder(struct bw_stats_struct *stats)
156 struct proc_dir_entry *ent;
158 ent = create_proc_read_entry("bus_watcher", S_IWUSR | S_IRUGO, NULL,
159 bw_read_proc, stats);
160 if (!ent) {
161 printk(KERN_INFO "Unable to initialize bus_watcher /proc entry\n");
162 return;
166 #endif /* CONFIG_PROC_FS */
169 * sibyte_bw_int - handle bus watcher interrupts and accumulate counts
171 * notes: possible re-entry due to multiple sources
172 * should check/indicate saturation
174 static irqreturn_t sibyte_bw_int(int irq, void *data)
176 struct bw_stats_struct *stats = data;
177 unsigned long cntr;
178 #ifdef CONFIG_SIBYTE_BW_TRACE
179 int i;
180 #endif
181 #ifndef CONFIG_PROC_FS
182 char bw_buf[1024];
183 #endif
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));
189 for (i=0; i<256*6; i++)
190 printk("%016llx\n",
191 (long long)__raw_readq(IOADDR(A_SCD_TRACE_READ)));
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
197 /* Destructive read, clears register and interrupt */
198 stats->status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS));
199 stats->status_printed = 0;
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));
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));
214 #ifndef CONFIG_PROC_FS
215 bw_print_buffer(bw_buf, stats);
216 printk(bw_buf);
217 #endif
219 return IRQ_HANDLED;
222 int __init sibyte_bus_watcher(void)
224 memset(&bw_stats, 0, sizeof(struct bw_stats_struct));
225 bw_stats.status_printed = 1;
227 if (request_irq(K_INT_BAD_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
228 printk("Failed to register bus watcher BAD_ECC irq\n");
229 return -1;
231 if (request_irq(K_INT_COR_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
232 free_irq(K_INT_BAD_ECC, &bw_stats);
233 printk("Failed to register bus watcher COR_ECC irq\n");
234 return -1;
236 if (request_irq(K_INT_IO_BUS, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
237 free_irq(K_INT_BAD_ECC, &bw_stats);
238 free_irq(K_INT_COR_ECC, &bw_stats);
239 printk("Failed to register bus watcher IO_BUS irq\n");
240 return -1;
243 #ifdef CONFIG_PROC_FS
244 create_proc_decoder(&bw_stats);
245 #endif
247 #ifdef CONFIG_SIBYTE_BW_TRACE
248 csr_out32((M_SCD_TRSEQ_ASAMPLE | M_SCD_TRSEQ_DSAMPLE |
249 K_SCD_TRSEQ_TRIGGER_ALL),
250 IOADDR(A_SCD_TRACE_SEQUENCE_0));
251 csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
252 csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG));
253 #endif
255 return 0;
258 __initcall(sibyte_bus_watcher);