x86/oprofile: Implement op_x86_virt_to_phys()

This patch implements a common x86 function to convert virtual counter
numbers to physical.

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

3 files changed, 8 insertions, 1 deletions

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 7b3362f9abdb..5856e61cb098 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -129,6 +129,11 @@ inline int op_x86_phys_to_virt(int phys)
         return __get_cpu_var(switch_index) + phys;
 }
 
+inline int op_x86_virt_to_phys(int virt)
+{
+        return virt % model->num_counters;
+}
+
 static void nmi_shutdown_mux(void)
 {
         int i;
@@ -270,6 +275,7 @@ static void mux_clone(int cpu)
 #else
 
 inline int op_x86_phys_to_virt(int phys) { return phys; }
+inline int op_x86_virt_to_phys(int virt) { return virt; }
 static inline void nmi_shutdown_mux(void) { }
 static inline int nmi_setup_mux(void) { return 1; }
 static inline void
diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c
index dce69b5979e6..1ea19829d985 100644
--- a/arch/x86/oprofile/op_model_amd.c
+++ b/arch/x86/oprofile/op_model_amd.c
@@ -81,7 +81,7 @@ static void op_mux_fill_in_addresses(struct op_msrs * const msrs)
         int i;
 
         for (i = 0; i < NUM_VIRT_COUNTERS; i++) {
-                int hw_counter = i % NUM_COUNTERS;
+                int hw_counter = op_x86_virt_to_phys(i);
                 if (reserve_perfctr_nmi(MSR_K7_PERFCTR0 + i))
                         msrs->multiplex[i].addr = MSR_K7_PERFCTR0 + hw_counter;
                 else
diff --git a/arch/x86/oprofile/op_x86_model.h b/arch/x86/oprofile/op_x86_model.h
index 4e2e7c2c519f..b83776180c7f 100644
--- a/arch/x86/oprofile/op_x86_model.h
+++ b/arch/x86/oprofile/op_x86_model.h
@@ -60,6 +60,7 @@ struct op_counter_config;
 extern u64 op_x86_get_ctrl(struct op_x86_model_spec const *model,
                            struct op_counter_config *counter_config);
 extern int op_x86_phys_to_virt(int phys);
+extern int op_x86_virt_to_phys(int virt);
 
 extern struct op_x86_model_spec op_ppro_spec;
 extern struct op_x86_model_spec op_p4_spec;