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