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/arch/mips/sibyte/sb1250/bus_watcher.c

https://bitbucket.org/evzijst/gittest
C | 259 lines | 180 code | 33 blank | 46 comment | 14 complexity | 85102eb99163e8a06e8faaa1f91e0562 MD5 | raw file
  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/config.h>
 29#include <linux/init.h>
 30#include <linux/kernel.h>
 31#include <linux/interrupt.h>
 32#include <linux/sched.h>
 33#include <linux/proc_fs.h>
 34#include <asm/system.h>
 35#include <asm/io.h>
 36
 37#include <asm/sibyte/sb1250.h>
 38#include <asm/sibyte/sb1250_regs.h>
 39#include <asm/sibyte/sb1250_int.h>
 40#include <asm/sibyte/sb1250_scd.h>
 41
 42
 43struct bw_stats_struct {
 44	uint64_t status;
 45	uint32_t l2_err;
 46	uint32_t memio_err;
 47	int status_printed;
 48	unsigned long l2_cor_d;
 49	unsigned long l2_bad_d;
 50	unsigned long l2_cor_t;
 51	unsigned long l2_bad_t;
 52	unsigned long mem_cor_d;
 53	unsigned long mem_bad_d;
 54	unsigned long bus_error;
 55} bw_stats;
 56
 57
 58static void print_summary(uint32_t status, uint32_t l2_err,
 59			  uint32_t memio_err)
 60{
 61	printk("Bus watcher error counters: %08x %08x\n", l2_err, memio_err);
 62	printk("\nLast recorded signature:\n");
 63	printk("Request %02x from %d, answered by %d with Dcode %d\n",
 64	       (unsigned int)(G_SCD_BERR_TID(status) & 0x3f),
 65	       (int)(G_SCD_BERR_TID(status) >> 6),
 66	       (int)G_SCD_BERR_RID(status),
 67	       (int)G_SCD_BERR_DCODE(status));
 68}
 69
 70/*
 71 * check_bus_watcher is exported for use in situations where we want
 72 * to see the most recent status of the bus watcher, which might have
 73 * already been destructively read out of the registers.
 74 *
 75 * notes: this is currently used by the cache error handler
 76 *        should provide locking against the interrupt handler
 77 */
 78void check_bus_watcher(void)
 79{
 80	u32 status, l2_err, memio_err;
 81
 82#ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
 83	/* Destructive read, clears register and interrupt */
 84	status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS));
 85#else
 86	/* Use non-destructive register */
 87	status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS_DEBUG));
 88#endif
 89	if (!(status & 0x7fffffff)) {
 90		printk("Using last values reaped by bus watcher driver\n");
 91		status = bw_stats.status;
 92		l2_err = bw_stats.l2_err;
 93		memio_err = bw_stats.memio_err;
 94	} else {
 95		l2_err = csr_in32(IOADDR(A_BUS_L2_ERRORS));
 96		memio_err = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS));
 97	}
 98	if (status & ~(1UL << 31))
 99		print_summary(status, l2_err, memio_err);
100	else
101		printk("Bus watcher indicates no error\n");
102}
103
104static int bw_print_buffer(char *page, struct bw_stats_struct *stats)
105{
106	int len;
107
108	len = sprintf(page, "SiByte Bus Watcher statistics\n");
109	len += sprintf(page+len, "-----------------------------\n");
110	len += sprintf(page+len, "L2-d-cor %8ld\nL2-d-bad %8ld\n",
111		       stats->l2_cor_d, stats->l2_bad_d);
112	len += sprintf(page+len, "L2-t-cor %8ld\nL2-t-bad %8ld\n",
113		       stats->l2_cor_t, stats->l2_bad_t);
114	len += sprintf(page+len, "MC-d-cor %8ld\nMC-d-bad %8ld\n",
115		       stats->mem_cor_d, stats->mem_bad_d);
116	len += sprintf(page+len, "IO-err   %8ld\n", stats->bus_error);
117	len += sprintf(page+len, "\nLast recorded signature:\n");
118	len += sprintf(page+len, "Request %02x from %d, answered by %d with Dcode %d\n",
119		       (unsigned int)(G_SCD_BERR_TID(stats->status) & 0x3f),
120		       (int)(G_SCD_BERR_TID(stats->status) >> 6),
121		       (int)G_SCD_BERR_RID(stats->status),
122		       (int)G_SCD_BERR_DCODE(stats->status));
123	/* XXXKW indicate multiple errors between printings, or stats
124           collection (or both)? */
125	if (stats->status & M_SCD_BERR_MULTERRS)
126		len += sprintf(page+len, "Multiple errors observed since last check.\n");
127	if (stats->status_printed) {
128		len += sprintf(page+len, "(no change since last printing)\n");
129	} else {
130		stats->status_printed = 1;
131	}
132
133	return len;
134}
135
136#ifdef CONFIG_PROC_FS
137
138/* For simplicity, I want to assume a single read is required each
139   time */
140static int bw_read_proc(char *page, char **start, off_t off,
141			int count, int *eof, void *data)
142{
143	int len;
144
145	if (off == 0) {
146		len = bw_print_buffer(page, data);
147		*start = page;
148	} else {
149		len = 0;
150		*eof = 1;
151	}
152	return len;
153}
154
155static void create_proc_decoder(struct bw_stats_struct *stats)
156{
157	struct proc_dir_entry *ent;
158	
159	ent = create_proc_read_entry("bus_watcher", S_IWUSR | S_IRUGO, NULL,
160				     bw_read_proc, stats);
161	if (!ent) {
162		printk(KERN_INFO "Unable to initialize bus_watcher /proc entry\n");
163		return;
164	}
165}
166
167#endif /* CONFIG_PROC_FS */
168
169/*
170 * sibyte_bw_int - handle bus watcher interrupts and accumulate counts
171 *
172 * notes: possible re-entry due to multiple sources
173 *        should check/indicate saturation
174 */
175static irqreturn_t sibyte_bw_int(int irq, void *data, struct pt_regs *regs)
176{
177	struct bw_stats_struct *stats = data;
178	unsigned long cntr;
179#ifdef CONFIG_SIBYTE_BW_TRACE
180	int i;
181#endif
182#ifndef CONFIG_PROC_FS
183	char bw_buf[1024];
184#endif
185
186#ifdef CONFIG_SIBYTE_BW_TRACE
187	csr_out32(M_SCD_TRACE_CFG_FREEZE, IOADDR(A_SCD_TRACE_CFG));
188	csr_out32(M_SCD_TRACE_CFG_START_READ, IOADDR(A_SCD_TRACE_CFG));
189
190	for (i=0; i<256*6; i++)
191		printk("%016llx\n",
192		       (unsigned long long)bus_readq(IOADDR(A_SCD_TRACE_READ)));
193
194	csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
195	csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG));
196#endif
197
198	/* Destructive read, clears register and interrupt */
199	stats->status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS));
200	stats->status_printed = 0;
201
202	stats->l2_err = cntr = csr_in32(IOADDR(A_BUS_L2_ERRORS));
203	stats->l2_cor_d += G_SCD_L2ECC_CORR_D(cntr);
204	stats->l2_bad_d += G_SCD_L2ECC_BAD_D(cntr);
205	stats->l2_cor_t += G_SCD_L2ECC_CORR_T(cntr);
206	stats->l2_bad_t += G_SCD_L2ECC_BAD_T(cntr);
207	csr_out32(0, IOADDR(A_BUS_L2_ERRORS));
208
209	stats->memio_err = cntr = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS));
210	stats->mem_cor_d += G_SCD_MEM_ECC_CORR(cntr);
211	stats->mem_bad_d += G_SCD_MEM_ECC_BAD(cntr);
212	stats->bus_error += G_SCD_MEM_BUSERR(cntr);
213	csr_out32(0, IOADDR(A_BUS_MEM_IO_ERRORS));
214
215#ifndef CONFIG_PROC_FS
216	bw_print_buffer(bw_buf, stats);
217	printk(bw_buf);
218#endif
219
220	return IRQ_HANDLED;
221}
222
223int __init sibyte_bus_watcher(void)
224{
225	memset(&bw_stats, 0, sizeof(struct bw_stats_struct));
226	bw_stats.status_printed = 1;
227
228	if (request_irq(K_INT_BAD_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
229		printk("Failed to register bus watcher BAD_ECC irq\n");
230		return -1;
231	}
232	if (request_irq(K_INT_COR_ECC, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
233		free_irq(K_INT_BAD_ECC, &bw_stats);
234		printk("Failed to register bus watcher COR_ECC irq\n");
235		return -1;
236	}
237	if (request_irq(K_INT_IO_BUS, sibyte_bw_int, 0, "Bus watcher", &bw_stats)) {
238		free_irq(K_INT_BAD_ECC, &bw_stats);
239		free_irq(K_INT_COR_ECC, &bw_stats);
240		printk("Failed to register bus watcher IO_BUS irq\n");
241		return -1;
242	}
243
244#ifdef CONFIG_PROC_FS
245	create_proc_decoder(&bw_stats);
246#endif
247
248#ifdef CONFIG_SIBYTE_BW_TRACE
249	csr_out32((M_SCD_TRSEQ_ASAMPLE | M_SCD_TRSEQ_DSAMPLE |
250		   K_SCD_TRSEQ_TRIGGER_ALL),
251		  IOADDR(A_SCD_TRACE_SEQUENCE_0));
252	csr_out32(M_SCD_TRACE_CFG_RESET, IOADDR(A_SCD_TRACE_CFG));
253	csr_out32(M_SCD_TRACE_CFG_START, IOADDR(A_SCD_TRACE_CFG));
254#endif
255
256	return 0;
257}
258
259__initcall(sibyte_bus_watcher);