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Linux/arch/mips/sibyte/common/bus_watcher.c

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  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 #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 */
116 static 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 
148 static int bw_proc_open(struct inode *inode, struct file *file)
149 {
150         return single_open(file, bw_proc_show, PDE_DATA(inode));
151 }
152 
153 static 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 
160 static 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  */
180 static 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 
220 int __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 

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