oprofile, x86: Add support for 6 counters (AMD family 15h)

This patch adds support for up to 6 hardware counters for AMD family
15h cpus. There is a new MSR range for hardware counters beginning at
MSRC001_0200 Performance Event Select (PERF_CTL0).

Signed-off-by: Robert Richter <robert.richter@amd.com>

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 6b89f5e..86030f6 100644 (file)
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -123,6 +123,10 @@
 #define MSR_AMD64_IBSCTL               0xc001103a
 #define MSR_AMD64_IBSBRTARGET          0xc001103b
 
+/* Fam 15h MSRs */
+#define MSR_F15H_PERF_CTL              0xc0010200
+#define MSR_F15H_PERF_CTR              0xc0010201
+
 /* Fam 10h MSRs */
 #define MSR_FAM10H_MMIO_CONF_BASE      0xc0010058
 #define FAM10H_MMIO_CONF_ENABLE                (1<<0)

diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c
index a011bcc..f2984d4 100644 (file)
--- a/arch/x86/oprofile/op_model_amd.c
+++ b/arch/x86/oprofile/op_model_amd.c
@@ -29,11 +29,12 @@
 #include "op_x86_model.h"
 #include "op_counter.h"
 
-#define NUM_COUNTERS 4
+#define NUM_COUNTERS           4
+#define NUM_COUNTERS_F15H      6
 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
-#define NUM_VIRT_COUNTERS 32
+#define NUM_VIRT_COUNTERS      32
 #else
-#define NUM_VIRT_COUNTERS NUM_COUNTERS
+#define NUM_VIRT_COUNTERS      0
 #endif
 
 #define OP_EVENT_MASK                  0x0FFF
@@ -41,7 +42,8 @@
 
 #define MSR_AMD_EVENTSEL_RESERVED      ((0xFFFFFCF0ULL<<32)|(1ULL<<21))
 
-static unsigned long reset_value[NUM_VIRT_COUNTERS];
+static int num_counters;
+static unsigned long reset_value[OP_MAX_COUNTER];
 
 #define IBS_FETCH_SIZE                 6
 #define IBS_OP_SIZE                    12
@@ -387,7 +389,7 @@ static void op_mux_switch_ctrl(struct op_x86_model_spec const *model,
        int i;
 
        /* enable active counters */
-       for (i = 0; i < NUM_COUNTERS; ++i) {
+       for (i = 0; i < num_counters; ++i) {
                int virt = op_x86_phys_to_virt(i);
                if (!reset_value[virt])
                        continue;
@@ -406,7 +408,7 @@ static void op_amd_shutdown(struct op_msrs const * const msrs)
 {
        int i;
 
-       for (i = 0; i < NUM_COUNTERS; ++i) {
+       for (i = 0; i < num_counters; ++i) {
                if (!msrs->counters[i].addr)
                        continue;
                release_perfctr_nmi(MSR_K7_PERFCTR0 + i);
@@ -418,7 +420,7 @@ static int op_amd_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_K7_PERFCTR0 + i))
                        goto fail;
                if (!reserve_evntsel_nmi(MSR_K7_EVNTSEL0 + i)) {
@@ -426,8 +428,13 @@ static int op_amd_fill_in_addresses(struct op_msrs * const msrs)
                        goto fail;
                }
                /* both registers must be reserved */
-               msrs->counters[i].addr = MSR_K7_PERFCTR0 + i;
-               msrs->controls[i].addr = MSR_K7_EVNTSEL0 + i;
+               if (num_counters == NUM_COUNTERS_F15H) {
+                       msrs->counters[i].addr = MSR_F15H_PERF_CTR + (i << 1);
+                       msrs->controls[i].addr = MSR_F15H_PERF_CTL + (i << 1);
+               } else {
+                       msrs->controls[i].addr = MSR_K7_EVNTSEL0 + i;
+                       msrs->counters[i].addr = MSR_K7_PERFCTR0 + i;
+               }
                continue;
        fail:
                if (!counter_config[i].enabled)
@@ -447,7 +454,7 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
        int i;
 
        /* setup reset_value */
-       for (i = 0; i < NUM_VIRT_COUNTERS; ++i) {
+       for (i = 0; i < OP_MAX_COUNTER; ++i) {
                if (counter_config[i].enabled
                    && msrs->counters[op_x86_virt_to_phys(i)].addr)
                        reset_value[i] = counter_config[i].count;
@@ -456,7 +463,7 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
        }
 
        /* clear all counters */
-       for (i = 0; i < NUM_COUNTERS; ++i) {
+       for (i = 0; i < num_counters; ++i) {
                if (!msrs->controls[i].addr)
                        continue;
                rdmsrl(msrs->controls[i].addr, val);
@@ -472,7 +479,7 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
        }
 
        /* enable active counters */
-       for (i = 0; i < NUM_COUNTERS; ++i) {
+       for (i = 0; i < num_counters; ++i) {
                int virt = op_x86_phys_to_virt(i);
                if (!reset_value[virt])
                        continue;
@@ -503,7 +510,7 @@ static int op_amd_check_ctrs(struct pt_regs * const regs,
        u64 val;
        int i;
 
-       for (i = 0; i < NUM_COUNTERS; ++i) {
+       for (i = 0; i < num_counters; ++i) {
                int virt = op_x86_phys_to_virt(i);
                if (!reset_value[virt])
                        continue;
@@ -526,7 +533,7 @@ static void op_amd_start(struct op_msrs const * const msrs)
        u64 val;
        int i;
 
-       for (i = 0; i < NUM_COUNTERS; ++i) {
+       for (i = 0; i < num_counters; ++i) {
                if (!reset_value[op_x86_phys_to_virt(i)])
                        continue;
                rdmsrl(msrs->controls[i].addr, val);
@@ -546,7 +553,7 @@ static void op_amd_stop(struct op_msrs const * const msrs)
         * Subtle: stop on all counters to avoid race with setting our
         * pm callback
         */
-       for (i = 0; i < NUM_COUNTERS; ++i) {
+       for (i = 0; i < num_counters; ++i) {
                if (!reset_value[op_x86_phys_to_virt(i)])
                        continue;
                rdmsrl(msrs->controls[i].addr, val);
@@ -698,18 +705,29 @@ static int setup_ibs_files(struct super_block *sb, struct dentry *root)
        return 0;
 }
 
+struct op_x86_model_spec op_amd_spec;
+
 static int op_amd_init(struct oprofile_operations *ops)
 {
        init_ibs();
        create_arch_files = ops->create_files;
        ops->create_files = setup_ibs_files;
+
+       if (boot_cpu_data.x86 == 0x15) {
+               num_counters = NUM_COUNTERS_F15H;
+       } else {
+               num_counters = NUM_COUNTERS;
+       }
+
+       op_amd_spec.num_counters = num_counters;
+       op_amd_spec.num_controls = num_counters;
+       op_amd_spec.num_virt_counters = max(num_counters, NUM_VIRT_COUNTERS);
+
        return 0;
 }
 
 struct op_x86_model_spec op_amd_spec = {
-       .num_counters           = NUM_COUNTERS,
-       .num_controls           = NUM_COUNTERS,
-       .num_virt_counters      = NUM_VIRT_COUNTERS,
+       /* num_counters/num_controls filled in at runtime */
        .reserved               = MSR_AMD_EVENTSEL_RESERVED,
        .event_mask             = OP_EVENT_MASK,
        .init                   = op_amd_init,