1 /*
2 * /proc hooks for SMTC kernel
3 * Copyright (C) 2005 Mips Technologies, Inc
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/sched.h>
8 #include <linux/cpumask.h>
9 #include <linux/interrupt.h>
10
11 #include <asm/cpu.h>
12 #include <asm/processor.h>
13 #include <asm/atomic.h>
14 #include <asm/system.h>
15 #include <asm/hardirq.h>
16 #include <asm/mmu_context.h>
17 #include <asm/mipsregs.h>
18 #include <asm/cacheflush.h>
19 #include <linux/proc_fs.h>
20
21 #include <asm/smtc_proc.h>
22
23 /*
24 * /proc diagnostic and statistics hooks
25 */
26
27 /*
28 * Statistics gathered
29 */
30 unsigned long selfipis[NR_CPUS];
31
32 struct smtc_cpu_proc smtc_cpu_stats[NR_CPUS];
33
34 static struct proc_dir_entry *smtc_stats;
35
36 atomic_t smtc_fpu_recoveries;
37
proc_read_smtc(char * page,char ** start,off_t off,int count,int * eof,void * data)38 static int proc_read_smtc(char *page, char **start, off_t off,
39 int count, int *eof, void *data)
40 {
41 int totalen = 0;
42 int len;
43 int i;
44 extern unsigned long ebase;
45
46 len = sprintf(page, "SMTC Status Word: 0x%08x\n", smtc_status);
47 totalen += len;
48 page += len;
49 len = sprintf(page, "Config7: 0x%08x\n", read_c0_config7());
50 totalen += len;
51 page += len;
52 len = sprintf(page, "EBASE: 0x%08lx\n", ebase);
53 totalen += len;
54 page += len;
55 len = sprintf(page, "Counter Interrupts taken per CPU (TC)\n");
56 totalen += len;
57 page += len;
58 for (i=0; i < NR_CPUS; i++) {
59 len = sprintf(page, "%d: %ld\n", i, smtc_cpu_stats[i].timerints);
60 totalen += len;
61 page += len;
62 }
63 len = sprintf(page, "Self-IPIs by CPU:\n");
64 totalen += len;
65 page += len;
66 for(i = 0; i < NR_CPUS; i++) {
67 len = sprintf(page, "%d: %ld\n", i, smtc_cpu_stats[i].selfipis);
68 totalen += len;
69 page += len;
70 }
71 len = sprintf(page, "%d Recoveries of \"stolen\" FPU\n",
72 atomic_read(&smtc_fpu_recoveries));
73 totalen += len;
74 page += len;
75
76 return totalen;
77 }
78
init_smtc_stats(void)79 void init_smtc_stats(void)
80 {
81 int i;
82
83 for (i=0; i<NR_CPUS; i++) {
84 smtc_cpu_stats[i].timerints = 0;
85 smtc_cpu_stats[i].selfipis = 0;
86 }
87
88 atomic_set(&smtc_fpu_recoveries, 0);
89
90 smtc_stats = create_proc_read_entry("smtc", 0444, NULL,
91 proc_read_smtc, NULL);
92 }
93