1 files changed, 245 insertions, 0 deletions
diff --git a/arch/x86/oprofile/op_model_ppro.c b/arch/x86/oprofile/op_model_ppro.c
new file mode 100644
index 00000000..d90528ea
--- /dev/null
+++ b/arch/x86/oprofile/op_model_ppro.c
@@ -0,0 +1,245 @@
+/*
+ * @file op_model_ppro.h
+ * Family 6 perfmon and architectural perfmon MSR operations
+ *
+ * @remark Copyright 2002 OProfile authors
+ * @remark Copyright 2008 Intel Corporation
+ * @remark Read the file COPYING
+ *
+ * @author John Levon
+ * @author Philippe Elie
+ * @author Graydon Hoare
+ * @author Andi Kleen
+ * @author Robert Richter <robert.richter@amd.com>
+ */
+
+#include <linux/oprofile.h>
+#include <linux/slab.h>
+#include <asm/ptrace.h>
+#include <asm/msr.h>
+#include <asm/apic.h>
+#include <asm/nmi.h>
+
+#include "op_x86_model.h"
+#include "op_counter.h"
+
+static int num_counters = 2;
+static int counter_width = 32;
+
+#define MSR_PPRO_EVENTSEL_RESERVED	((0xFFFFFFFFULL<<32)|(1ULL<<21))
+
+static u64 reset_value[OP_MAX_COUNTER];
+
+static void ppro_shutdown(struct op_msrs const * const msrs)
+{
+	int i;
+
+	for (i = 0; i < num_counters; ++i) {
+		if (!msrs->counters[i].addr)
+			continue;
+		release_perfctr_nmi(MSR_P6_PERFCTR0 + i);
+		release_evntsel_nmi(MSR_P6_EVNTSEL0 + i);
+	}
+}
+
+static int ppro_fill_in_addresses(struct op_msrs * const msrs)
+{
+	int i;
+
+	for (i = 0; i < num_counters; i++) {
+		if (!reserve_perfctr_nmi(MSR_P6_PERFCTR0 + i))
+			goto fail;
+		if (!reserve_evntsel_nmi(MSR_P6_EVNTSEL0 + i)) {
+			release_perfctr_nmi(MSR_P6_PERFCTR0 + i);
+			goto fail;
+		}
+		/* both registers must be reserved */
+		msrs->counters[i].addr = MSR_P6_PERFCTR0 + i;
+		msrs->controls[i].addr = MSR_P6_EVNTSEL0 + i;
+		continue;
+	fail:
+		if (!counter_config[i].enabled)
+			continue;
+		op_x86_warn_reserved(i);
+		ppro_shutdown(msrs);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+
+static void ppro_setup_ctrs(struct op_x86_model_spec const *model,
+			    struct op_msrs const * const msrs)
+{
+	u64 val;
+	int i;
+
+	if (cpu_has_arch_perfmon) {
+		union cpuid10_eax eax;
+		eax.full = cpuid_eax(0xa);
+
+		/*
+		 * For Core2 (family 6, model 15), don't reset the
+		 * counter width:
+		 */
+		if (!(eax.split.version_id == 0 &&
+			__this_cpu_read(cpu_info.x86) == 6 &&
+				__this_cpu_read(cpu_info.x86_model) == 15)) {
+
+			if (counter_width < eax.split.bit_width)
+				counter_width = eax.split.bit_width;
+		}
+	}
+
+	/* clear all counters */
+	for (i = 0; i < num_counters; ++i) {
+		if (!msrs->controls[i].addr)
+			continue;
+		rdmsrl(msrs->controls[i].addr, val);
+		if (val & ARCH_PERFMON_EVENTSEL_ENABLE)
+			op_x86_warn_in_use(i);
+		val &= model->reserved;
+		wrmsrl(msrs->controls[i].addr, val);
+		/*
+		 * avoid a false detection of ctr overflows in NMI *
+		 * handler
+		 */
+		wrmsrl(msrs->counters[i].addr, -1LL);
+	}
+
+	/* enable active counters */
+	for (i = 0; i < num_counters; ++i) {
+		if (counter_config[i].enabled && msrs->counters[i].addr) {
+			reset_value[i] = counter_config[i].count;
+			wrmsrl(msrs->counters[i].addr, -reset_value[i]);
+			rdmsrl(msrs->controls[i].addr, val);
+			val &= model->reserved;
+			val |= op_x86_get_ctrl(model, &counter_config[i]);
+			wrmsrl(msrs->controls[i].addr, val);
+		} else {
+			reset_value[i] = 0;
+		}
+	}
+}
+
+
+static int ppro_check_ctrs(struct pt_regs * const regs,
+			   struct op_msrs const * const msrs)
+{
+	u64 val;
+	int i;
+
+	for (i = 0; i < num_counters; ++i) {
+		if (!reset_value[i])
+			continue;
+		rdmsrl(msrs->counters[i].addr, val);
+		if (val & (1ULL << (counter_width - 1)))
+			continue;
+		oprofile_add_sample(regs, i);
+		wrmsrl(msrs->counters[i].addr, -reset_value[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)
+{
+	u64 val;
+	int i;
+
+	for (i = 0; i < num_counters; ++i) {
+		if (reset_value[i]) {
+			rdmsrl(msrs->controls[i].addr, val);
+			val |= ARCH_PERFMON_EVENTSEL_ENABLE;
+			wrmsrl(msrs->controls[i].addr, val);
+		}
+	}
+}
+
+
+static void ppro_stop(struct op_msrs const * const msrs)
+{
+	u64 val;
+	int i;
+
+	for (i = 0; i < num_counters; ++i) {
+		if (!reset_value[i])
+			continue;
+		rdmsrl(msrs->controls[i].addr, val);
+		val &= ~ARCH_PERFMON_EVENTSEL_ENABLE;
+		wrmsrl(msrs->controls[i].addr, val);
+	}
+}
+
+struct op_x86_model_spec op_ppro_spec = {
+	.num_counters		= 2,
+	.num_controls		= 2,
+	.reserved		= MSR_PPRO_EVENTSEL_RESERVED,
+	.fill_in_addresses	= &ppro_fill_in_addresses,
+	.setup_ctrs		= &ppro_setup_ctrs,
+	.check_ctrs		= &ppro_check_ctrs,
+	.start			= &ppro_start,
+	.stop			= &ppro_stop,
+	.shutdown		= &ppro_shutdown
+};
+
+/*
+ * Architectural performance monitoring.
+ *
+ * Newer Intel CPUs (Core1+) have support for architectural
+ * events described in CPUID 0xA. See the IA32 SDM Vol3b.18 for details.
+ * The advantage of this is that it can be done without knowing about
+ * the specific CPU.
+ */
+
+static void arch_perfmon_setup_counters(void)
+{
+	union cpuid10_eax eax;
+
+	eax.full = cpuid_eax(0xa);
+
+	/* Workaround for BIOS bugs in 6/15. Taken from perfmon2 */
+	if (eax.split.version_id == 0 && __this_cpu_read(cpu_info.x86) == 6 &&
+		__this_cpu_read(cpu_info.x86_model) == 15) {
+		eax.split.version_id = 2;
+		eax.split.num_counters = 2;
+		eax.split.bit_width = 40;
+	}
+
+	num_counters = min((int)eax.split.num_counters, OP_MAX_COUNTER);
+
+	op_arch_perfmon_spec.num_counters = num_counters;
+	op_arch_perfmon_spec.num_controls = num_counters;
+}
+
+static int arch_perfmon_init(struct oprofile_operations *ignore)
+{
+	arch_perfmon_setup_counters();
+	return 0;
+}
+
+struct op_x86_model_spec op_arch_perfmon_spec = {
+	.reserved		= MSR_PPRO_EVENTSEL_RESERVED,
+	.init			= &arch_perfmon_init,
+	/* num_counters/num_controls filled in at runtime */
+	.fill_in_addresses	= &ppro_fill_in_addresses,
+	/* user space does the cpuid check for available events */
+	.setup_ctrs		= &ppro_setup_ctrs,
+	.check_ctrs		= &ppro_check_ctrs,
+	.start			= &ppro_start,
+	.stop			= &ppro_stop,
+	.shutdown		= &ppro_shutdown
+};