[MIPS] MT: Improved multithreading support.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/smtc-proc.c

@@ -0,0 +1,93 @@
+/*
+ * /proc hooks for SMTC kernel
+ * Copyright (C) 2005 Mips Technologies, Inc
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/cpumask.h>
+#include <linux/interrupt.h>
+
+#include <asm/cpu.h>
+#include <asm/processor.h>
+#include <asm/atomic.h>
+#include <asm/system.h>
+#include <asm/hardirq.h>
+#include <asm/mmu_context.h>
+#include <asm/smp.h>
+#include <asm/mipsregs.h>
+#include <asm/cacheflush.h>
+#include <linux/proc_fs.h>
+
+#include <asm/smtc_proc.h>
+
+/*
+ * /proc diagnostic and statistics hooks
+ */
+
+/*
+ * Statistics gathered
+ */
+unsigned long selfipis[NR_CPUS];
+
+struct smtc_cpu_proc smtc_cpu_stats[NR_CPUS];
+
+static struct proc_dir_entry *smtc_stats;
+
+atomic_t smtc_fpu_recoveries;
+
+static int proc_read_smtc(char *page, char **start, off_t off,
+                          int count, int *eof, void *data)
+{
+	int totalen = 0;
+	int len;
+	int i;
+	extern unsigned long ebase;
+
+	len = sprintf(page, "SMTC Status Word: 0x%08x\n", smtc_status);
+	totalen += len;
+	page += len;
+	len = sprintf(page, "Config7: 0x%08x\n", read_c0_config7());
+	totalen += len;
+	page += len;
+	len = sprintf(page, "EBASE: 0x%08lx\n", ebase);
+	totalen += len;
+	page += len;
+	len = sprintf(page, "Counter Interrupts taken per CPU (TC)\n");
+	totalen += len;
+	page += len;
+	for (i=0; i < NR_CPUS; i++) {
+		len = sprintf(page, "%d: %ld\n", i, smtc_cpu_stats[i].timerints);
+		totalen += len;
+		page += len;
+	}
+	len = sprintf(page, "Self-IPIs by CPU:\n");
+	totalen += len;
+	page += len;
+	for(i = 0; i < NR_CPUS; i++) {
+		len = sprintf(page, "%d: %ld\n", i, smtc_cpu_stats[i].selfipis);
+		totalen += len;
+		page += len;
+	}
+	len = sprintf(page, "%d Recoveries of \"stolen\" FPU\n",
+	              atomic_read(&smtc_fpu_recoveries));
+	totalen += len;
+	page += len;
+
+	return totalen;
+}
+
+void init_smtc_stats(void)
+{
+	int i;
+
+	for (i=0; i<NR_CPUS; i++) {
+		smtc_cpu_stats[i].timerints = 0;
+		smtc_cpu_stats[i].selfipis = 0;
+	}
+
+	atomic_set(&smtc_fpu_recoveries, 0);
+
+	smtc_stats = create_proc_read_entry("smtc", 0444, NULL,
+	                                    proc_read_smtc, NULL);
+}