1 files changed, 143 insertions, 0 deletions
diff --git a/arch/i386/oprofile/op_model_ppro.c b/arch/i386/oprofile/op_model_ppro.c
new file mode 100644
index 000000000000..d719015fc044
--- /dev/null
+++ b/arch/i386/oprofile/op_model_ppro.c
@@ -0,0 +1,143 @@
+/**
+ * @file op_model_ppro.h
+ * pentium pro / P6 model-specific MSR operations
+ *
+ * @remark Copyright 2002 OProfile authors
+ * @remark Read the file COPYING
+ *
+ * @author John Levon
+ * @author Philippe Elie
+ * @author Graydon Hoare
+ */
+
+#include <linux/oprofile.h>
+#include <asm/ptrace.h>
+#include <asm/msr.h>
+#include <asm/apic.h>
+ 
+#include "op_x86_model.h"
+#include "op_counter.h"
+
+#define NUM_COUNTERS 2
+#define NUM_CONTROLS 2
+
+#define CTR_READ(l,h,msrs,c) do {rdmsr(msrs->counters[(c)].addr, (l), (h));} while (0)
+#define CTR_WRITE(l,msrs,c) do {wrmsr(msrs->counters[(c)].addr, -(u32)(l), -1);} while (0)
+#define CTR_OVERFLOWED(n) (!((n) & (1U<<31)))
+
+#define CTRL_READ(l,h,msrs,c) do {rdmsr((msrs->controls[(c)].addr), (l), (h));} while (0)
+#define CTRL_WRITE(l,h,msrs,c) do {wrmsr((msrs->controls[(c)].addr), (l), (h));} while (0)
+#define CTRL_SET_ACTIVE(n) (n |= (1<<22))
+#define CTRL_SET_INACTIVE(n) (n &= ~(1<<22))
+#define CTRL_CLEAR(x) (x &= (1<<21))
+#define CTRL_SET_ENABLE(val) (val |= 1<<20)
+#define CTRL_SET_USR(val,u) (val |= ((u & 1) << 16))
+#define CTRL_SET_KERN(val,k) (val |= ((k & 1) << 17))
+#define CTRL_SET_UM(val, m) (val |= (m << 8))
+#define CTRL_SET_EVENT(val, e) (val |= e)
+
+static unsigned long reset_value[NUM_COUNTERS];
+ 
+static void ppro_fill_in_addresses(struct op_msrs * const msrs)
+{
+	msrs->counters[0].addr = MSR_P6_PERFCTR0;
+	msrs->counters[1].addr = MSR_P6_PERFCTR1;
+	
+	msrs->controls[0].addr = MSR_P6_EVNTSEL0;
+	msrs->controls[1].addr = MSR_P6_EVNTSEL1;
+}
+
+
+static void ppro_setup_ctrs(struct op_msrs const * const msrs)
+{
+	unsigned int low, high;
+	int i;
+
+	/* clear all counters */
+	for (i = 0 ; i < NUM_CONTROLS; ++i) {
+		CTRL_READ(low, high, msrs, i);
+		CTRL_CLEAR(low);
+		CTRL_WRITE(low, high, msrs, i);
+	}
+	
+	/* avoid a false detection of ctr overflows in NMI handler */
+	for (i = 0; i < NUM_COUNTERS; ++i) {
+		CTR_WRITE(1, msrs, i);
+	}
+
+	/* enable active counters */
+	for (i = 0; i < NUM_COUNTERS; ++i) {
+		if (counter_config[i].enabled) {
+			reset_value[i] = counter_config[i].count;
+
+			CTR_WRITE(counter_config[i].count, msrs, i);
+
+			CTRL_READ(low, high, msrs, i);
+			CTRL_CLEAR(low);
+			CTRL_SET_ENABLE(low);
+			CTRL_SET_USR(low, counter_config[i].user);
+			CTRL_SET_KERN(low, counter_config[i].kernel);
+			CTRL_SET_UM(low, counter_config[i].unit_mask);
+			CTRL_SET_EVENT(low, counter_config[i].event);
+			CTRL_WRITE(low, high, msrs, i);
+		}
+	}
+}
+
+ 
+static int ppro_check_ctrs(struct pt_regs * const regs,
+			   struct op_msrs const * const msrs)
+{
+	unsigned int low, high;
+	int i;
+ 
+	for (i = 0 ; i < NUM_COUNTERS; ++i) {
+		CTR_READ(low, high, msrs, i);
+		if (CTR_OVERFLOWED(low)) {
+			oprofile_add_sample(regs, i);
+			CTR_WRITE(reset_value[i], msrs, i);
+		}
+	}
+
+	/* Only P6 based Pentium M need to re-unmask the apic vector but it
+	 * doesn't hurt other P6 variant */
+	apic_write(APIC_LVTPC, apic_read(APIC_LVTPC) & ~APIC_LVT_MASKED);
+
+	/* We can't work out if we really handled an interrupt. We
+	 * might have caught a *second* counter just after overflowing
+	 * the interrupt for this counter then arrives
+	 * and we don't find a counter that's overflowed, so we
+	 * would return 0 and get dazed + confused. Instead we always
+	 * assume we found an overflow. This sucks.
+	 */
+	return 1;
+}
+
+ 
+static void ppro_start(struct op_msrs const * const msrs)
+{
+	unsigned int low,high;
+	CTRL_READ(low, high, msrs, 0);
+	CTRL_SET_ACTIVE(low);
+	CTRL_WRITE(low, high, msrs, 0);
+}
+
+
+static void ppro_stop(struct op_msrs const * const msrs)
+{
+	unsigned int low,high;
+	CTRL_READ(low, high, msrs, 0);
+	CTRL_SET_INACTIVE(low);
+	CTRL_WRITE(low, high, msrs, 0);
+}
+
+
+struct op_x86_model_spec const op_ppro_spec = {
+	.num_counters = NUM_COUNTERS,
+	.num_controls = NUM_CONTROLS,
+	.fill_in_addresses = &ppro_fill_in_addresses,
+	.setup_ctrs = &ppro_setup_ctrs,
+	.check_ctrs = &ppro_check_ctrs,
+	.start = &ppro_start,
+	.stop = &ppro_stop
+};