2 files changed, 56 insertions, 0 deletions

diff --git a/arch/powerpc/perf/hv-common.c b/arch/powerpc/perf/hv-common.c
new file mode 100644
index 000000000000..47e02b366f58
--- /dev/null
+++ b/arch/powerpc/perf/hv-common.c
@@ -0,0 +1,39 @@
+#include <asm/io.h>
+#include <asm/hvcall.h>
+
+#include "hv-gpci.h"
+#include "hv-common.h"
+
+unsigned long hv_perf_caps_get(struct hv_perf_caps *caps)
+{
+        unsigned long r;
+        struct p {
+                struct hv_get_perf_counter_info_params params;
+                struct cv_system_performance_capabilities caps;
+        } __packed __aligned(sizeof(uint64_t));
+
+        struct p arg = {
+                .params = {
+                        .counter_request = cpu_to_be32(
+                                        CIR_SYSTEM_PERFORMANCE_CAPABILITIES),
+                        .starting_index = cpu_to_be32(-1),
+                        .counter_info_version_in = 0,
+                }
+        };
+
+        r = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
+                               virt_to_phys(&arg), sizeof(arg));
+
+        if (r)
+                return r;
+
+        pr_devel("capability_mask: 0x%x\n", arg.caps.capability_mask);
+
+        caps->version = arg.params.counter_info_version_out;
+        caps->collect_privileged = !!arg.caps.perf_collect_privileged;
+        caps->ga = !!(arg.caps.capability_mask & CV_CM_GA);
+        caps->expanded = !!(arg.caps.capability_mask & CV_CM_EXPANDED);
+        caps->lab = !!(arg.caps.capability_mask & CV_CM_LAB);
+
+        return r;
+}
diff --git a/arch/powerpc/perf/hv-common.h b/arch/powerpc/perf/hv-common.h
new file mode 100644
index 000000000000..7e615bd38bca
--- /dev/null
+++ b/arch/powerpc/perf/hv-common.h
@@ -0,0 +1,17 @@
+#ifndef LINUX_POWERPC_PERF_HV_COMMON_H_
+#define LINUX_POWERPC_PERF_HV_COMMON_H_
+
+#include <linux/types.h>
+
+struct hv_perf_caps {
+        u16 version;
+        u16 collect_privileged:1,
+            ga:1,
+            expanded:1,
+            lab:1,
+            unused:12;
+};
+
+unsigned long hv_perf_caps_get(struct hv_perf_caps *caps);
+
+#endif