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
print_summary(uint32_t status,uint32_t l2_err,uint32_t memio_err)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 */
check_bus_watcher(void)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 */
bw_proc_show(struct seq_file * m,void * v)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
create_proc_decoder(struct bw_stats_struct * stats)145 static void create_proc_decoder(struct bw_stats_struct *stats)
146 {
147 struct proc_dir_entry *ent;
148
149 ent = proc_create_single_data("bus_watcher", S_IWUSR | S_IRUGO, NULL,
150 bw_proc_show, stats);
151 if (!ent) {
152 printk(KERN_INFO "Unable to initialize bus_watcher /proc entry\n");
153 return;
154 }
155 }
156
157 #endif /* CONFIG_PROC_FS */
158
159 /*
160 * sibyte_bw_int - handle bus watcher interrupts and accumulate counts
161 *
162 * notes: possible re-entry due to multiple sources
163 * should check/indicate saturation
164 */
sibyte_bw_int(int irq,void * data)165 static irqreturn_t sibyte_bw_int(int irq, void *data)
166 {
167 struct bw_stats_struct *stats = data;
168 unsigned long cntr;
169 #ifdef CONFIG_SIBYTE_BW_TRACE
170 int i;
171 #endif
172
173 #ifdef CONFIG_SIBYTE_BW_TRACE
174 csr_out32(M_SCD_TRACE_CFG_FREEZE, IOADDR(A_SCD_TRACE_CFG));
175 csr_out32(M_SCD_TRACE_CFG_START_READ, IOADDR(A_SCD_TRACE_CFG));
176
177 for (i=0; i<256*6; i++)
178 printk("%016llx\n",
179 (long long)__raw_readq(IOADDR(A_SCD_TRACE_READ)));
180
181 csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
182 csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG));
183 #endif
184
185 /* Destructive read, clears register and interrupt */
186 stats->status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS));
187 stats->status_printed = 0;
188
189 stats->l2_err = cntr = csr_in32(IOADDR(A_BUS_L2_ERRORS));
190 stats->l2_cor_d += G_SCD_L2ECC_CORR_D(cntr);
191 stats->l2_bad_d += G_SCD_L2ECC_BAD_D(cntr);
192 stats->l2_cor_t += G_SCD_L2ECC_CORR_T(cntr);
193 stats->l2_bad_t += G_SCD_L2ECC_BAD_T(cntr);
194 csr_out32(0, IOADDR(A_BUS_L2_ERRORS));
195
196 stats->memio_err = cntr = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS));
197 stats->mem_cor_d += G_SCD_MEM_ECC_CORR(cntr);
198 stats->mem_bad_d += G_SCD_MEM_ECC_BAD(cntr);
199 stats->bus_error += G_SCD_MEM_BUSERR(cntr);
200 csr_out32(0, IOADDR(A_BUS_MEM_IO_ERRORS));
201
202 return IRQ_HANDLED;
203 }
204
sibyte_bus_watcher(void)205 int __init sibyte_bus_watcher(void)
206 {
207 memset(&bw_stats, 0, sizeof(struct bw_stats_struct));
208 bw_stats.status_printed = 1;
209
210 if (request_irq(K_INT_BAD_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
211 printk("Failed to register bus watcher BAD_ECC irq\n");
212 return -1;
213 }
214 if (request_irq(K_INT_COR_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
215 free_irq(K_INT_BAD_ECC, &bw_stats);
216 printk("Failed to register bus watcher COR_ECC irq\n");
217 return -1;
218 }
219 if (request_irq(K_INT_IO_BUS, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
220 free_irq(K_INT_BAD_ECC, &bw_stats);
221 free_irq(K_INT_COR_ECC, &bw_stats);
222 printk("Failed to register bus watcher IO_BUS irq\n");
223 return -1;
224 }
225
226 #ifdef CONFIG_PROC_FS
227 create_proc_decoder(&bw_stats);
228 #endif
229
230 #ifdef CONFIG_SIBYTE_BW_TRACE
231 csr_out32((M_SCD_TRSEQ_ASAMPLE | M_SCD_TRSEQ_DSAMPLE |
232 K_SCD_TRSEQ_TRIGGER_ALL),
233 IOADDR(A_SCD_TRACE_SEQUENCE_0));
234 csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
235 csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG));
236 #endif
237
238 return 0;
239 }
240
241 device_initcall(sibyte_bus_watcher);
242
