Merge branch 'oprofile/x86-oprofile-for-tip' into oprofile/oprofile-for-tip

Conflicts:
	arch/x86/oprofile/op_model_ppro.c

1 files changed, 85 insertions, 23 deletions

diff --git a/arch/x86/oprofile/op_model_ppro.c b/arch/x86/oprofile/op_model_ppro.c
index c665bac4a143..0620d6d45f7d 100644
--- a/arch/x86/oprofile/op_model_ppro.c
+++ b/arch/x86/oprofile/op_model_ppro.c
@@ -1,32 +1,34 @@
 /*
  * @file op_model_ppro.h
- * pentium pro / P6 model-specific MSR operations
+ * 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
  */
 
 #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 <asm/intel_arch_perfmon.h>
 
 #include "op_x86_model.h"
 #include "op_counter.h"
 
-#define NUM_COUNTERS 2
-#define NUM_CONTROLS 2
+static int num_counters = 2;
+static int counter_width = 32;
 
 #define CTR_IS_RESERVED(msrs, c) (msrs->counters[(c)].addr ? 1 : 0)
 #define CTR_READ(l, h, msrs, c) do {rdmsr(msrs->counters[(c)].addr, (l), (h)); } while (0)
-#define CTR_32BIT_WRITE(l, msrs, c)     \
-        do {wrmsr(msrs->counters[(c)].addr, -(u32)(l), 0); } while (0)
-#define CTR_OVERFLOWED(n) (!((n) & (1U<<31)))
+#define CTR_OVERFLOWED(n) (!((n) & (1U<<(counter_width-1))))
 
 #define CTRL_IS_RESERVED(msrs, c) (msrs->controls[(c)].addr ? 1 : 0)
 #define CTRL_READ(l, h, msrs, c) do {rdmsr((msrs->controls[(c)].addr), (l), (h)); } while (0)
@@ -40,20 +42,20 @@
 #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 u64 *reset_value;
 
 static void ppro_fill_in_addresses(struct op_msrs * const msrs)
 {
         int i;
 
-        for (i = 0; i < NUM_COUNTERS; i++) {
+        for (i = 0; i < num_counters; i++) {
                 if (reserve_perfctr_nmi(MSR_P6_PERFCTR0 + i))
                         msrs->counters[i].addr = MSR_P6_PERFCTR0 + i;
                 else
                         msrs->counters[i].addr = 0;
         }
 
-        for (i = 0; i < NUM_CONTROLS; i++) {
+        for (i = 0; i < num_counters; i++) {
                 if (reserve_evntsel_nmi(MSR_P6_EVNTSEL0 + i))
                         msrs->controls[i].addr = MSR_P6_EVNTSEL0 + i;
                 else
@@ -67,8 +69,22 @@ static void ppro_setup_ctrs(struct op_msrs const * const msrs)
         unsigned int low, high;
         int i;
 
+        if (!reset_value) {
+                reset_value = kmalloc(sizeof(unsigned) * num_counters,
+                                        GFP_ATOMIC);
+                if (!reset_value)
+                        return;
+        }
+
+        if (cpu_has_arch_perfmon) {
+                union cpuid10_eax eax;
+                eax.full = cpuid_eax(0xa);
+                if (counter_width < eax.split.bit_width)
+                        counter_width = eax.split.bit_width;
+        }
+
         /* clear all counters */
-        for (i = 0 ; i < NUM_CONTROLS; ++i) {
+        for (i = 0 ; i < num_counters; ++i) {
                 if (unlikely(!CTRL_IS_RESERVED(msrs, i)))
                         continue;
                 CTRL_READ(low, high, msrs, i);
@@ -77,18 +93,18 @@ static void ppro_setup_ctrs(struct op_msrs const * const msrs)
         }
 
         /* avoid a false detection of ctr overflows in NMI handler */
-        for (i = 0; i < NUM_COUNTERS; ++i) {
+        for (i = 0; i < num_counters; ++i) {
                 if (unlikely(!CTR_IS_RESERVED(msrs, i)))
                         continue;
-                CTR_32BIT_WRITE(1, msrs, i);
+                wrmsrl(msrs->counters[i].addr, -1LL);
         }
 
         /* enable active counters */
-        for (i = 0; i < NUM_COUNTERS; ++i) {
+        for (i = 0; i < num_counters; ++i) {
                 if ((counter_config[i].enabled) && (CTR_IS_RESERVED(msrs, i))) {
                         reset_value[i] = counter_config[i].count;
 
-                        CTR_32BIT_WRITE(counter_config[i].count, msrs, i);
+                        wrmsrl(msrs->counters[i].addr, -reset_value[i]);
 
                         CTRL_READ(low, high, msrs, i);
                         CTRL_CLEAR(low);
@@ -111,13 +127,13 @@ static int ppro_check_ctrs(struct pt_regs * const regs,
         unsigned int low, high;
         int i;
 
-        for (i = 0 ; i < NUM_COUNTERS; ++i) {
+        for (i = 0 ; i < num_counters; ++i) {
                 if (!reset_value[i])
                         continue;
                 CTR_READ(low, high, msrs, i);
                 if (CTR_OVERFLOWED(low)) {
                         oprofile_add_sample(regs, i);
-                        CTR_32BIT_WRITE(reset_value[i], msrs, i);
+                        wrmsrl(msrs->counters[i].addr, -reset_value[i]);
                 }
         }
 
@@ -141,7 +157,7 @@ static void ppro_start(struct op_msrs const * const msrs)
         unsigned int low, high;
         int i;
 
-        for (i = 0; i < NUM_COUNTERS; ++i) {
+        for (i = 0; i < num_counters; ++i) {
                 if (reset_value[i]) {
                         CTRL_READ(low, high, msrs, i);
                         CTRL_SET_ACTIVE(low);
@@ -156,7 +172,7 @@ static void ppro_stop(struct op_msrs const * const msrs)
         unsigned int low, high;
         int i;
 
-        for (i = 0; i < NUM_COUNTERS; ++i) {
+        for (i = 0; i < num_counters; ++i) {
                 if (!reset_value[i])
                         continue;
                 CTRL_READ(low, high, msrs, i);
@@ -169,21 +185,67 @@ static void ppro_shutdown(struct op_msrs const * const msrs)
 {
         int i;
 
-        for (i = 0 ; i < NUM_COUNTERS ; ++i) {
+        for (i = 0 ; i < num_counters ; ++i) {
                 if (CTR_IS_RESERVED(msrs, i))
                         release_perfctr_nmi(MSR_P6_PERFCTR0 + i);
         }
-        for (i = 0 ; i < NUM_CONTROLS ; ++i) {
+        for (i = 0 ; i < num_counters ; ++i) {
                 if (CTRL_IS_RESERVED(msrs, i))
                         release_evntsel_nmi(MSR_P6_EVNTSEL0 + i);
         }
+        if (reset_value) {
+                kfree(reset_value);
+                reset_value = NULL;
+        }
 }
 
 
-struct op_x86_model_spec const op_ppro_spec = {
-        .num_counters           = NUM_COUNTERS,
-        .num_controls           = NUM_CONTROLS,
+struct op_x86_model_spec op_ppro_spec = {
+        .num_counters           = 2,    /* can be overriden */
+        .num_controls           = 2,    /* dito */
+        .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.
+ */
+
+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 && current_cpu_data.x86 == 6 &&
+                current_cpu_data.x86_model == 15) {
+                eax.split.version_id = 2;
+                eax.split.num_counters = 2;
+                eax.split.bit_width = 40;
+        }
+
+        num_counters = eax.split.num_counters;
+
+        op_arch_perfmon_spec.num_counters = num_counters;
+        op_arch_perfmon_spec.num_controls = num_counters;
+        op_ppro_spec.num_counters = num_counters;
+        op_ppro_spec.num_controls = num_counters;
+}
+
+struct op_x86_model_spec op_arch_perfmon_spec = {
+        /* 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,