powerpc: tracing: Add hypervisor call tracepoints

[deliverable/linux.git] / arch / powerpc / platforms / pseries / hvCall_inst.c

diff --git a/arch/powerpc/platforms/pseries/hvCall_inst.c b/arch/powerpc/platforms/pseries/hvCall_inst.c
index 3631a4f277eb2ab8aaf02676d7124d6a2a430e44..e44e1035f133d3734b43f7afd3c309674e4b5a38 100644 (file)
--- a/arch/powerpc/platforms/pseries/hvCall_inst.c
+++ b/arch/powerpc/platforms/pseries/hvCall_inst.c
@@ -26,6 +26,7 @@
 #include <asm/hvcall.h>
 #include <asm/firmware.h>
 #include <asm/cputable.h>
+#include <asm/trace.h>
 
 DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
 
@@ -100,6 +101,34 @@ static const struct file_operations hcall_inst_seq_fops = {
 #define        HCALL_ROOT_DIR          "hcall_inst"
 #define CPU_NAME_BUF_SIZE      32
 
+
+static void probe_hcall_entry(unsigned long opcode)
+{
+       struct hcall_stats *h;
+
+       if (opcode > MAX_HCALL_OPCODE)
+               return;
+
+       h = &get_cpu_var(hcall_stats)[opcode / 4];
+       h->tb_start = mftb();
+       h->purr_start = mfspr(SPRN_PURR);
+}
+
+static void probe_hcall_exit(unsigned long opcode, unsigned long retval)
+{
+       struct hcall_stats *h;
+
+       if (opcode > MAX_HCALL_OPCODE)
+               return;
+
+       h = &__get_cpu_var(hcall_stats)[opcode / 4];
+       h->num_calls++;
+       h->tb_total = mftb() - h->tb_start;
+       h->purr_total = mfspr(SPRN_PURR) - h->purr_start;
+
+       put_cpu_var(hcall_stats);
+}
+
 static int __init hcall_inst_init(void)
 {
        struct dentry *hcall_root;
@@ -110,6 +139,14 @@ static int __init hcall_inst_init(void)
        if (!firmware_has_feature(FW_FEATURE_LPAR))
                return 0;
 
+       if (register_trace_hcall_entry(probe_hcall_entry))
+               return -EINVAL;
+
+       if (register_trace_hcall_exit(probe_hcall_exit)) {
+               unregister_trace_hcall_entry(probe_hcall_entry);
+               return -EINVAL;
+       }
+
        hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
        if (!hcall_root)
                return -ENOMEM;