1 files changed, 42 insertions, 6 deletions

diff --git a/arch/powerpc/platforms/pseries/hvCall_inst.c b/arch/powerpc/platforms/pseries/hvCall_inst.c
index 641e6511cf0..cf4e7736e4f 100644
--- 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);
 
@@ -34,7 +35,7 @@ DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
  */
 static void *hc_start(struct seq_file *m, loff_t *pos)
 {
-	if ((int)*pos < HCALL_STAT_ARRAY_SIZE)
+	if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
 		return (void *)(unsigned long)(*pos + 1);
 
 	return NULL;
@@ -54,10 +55,10 @@ static void hc_stop(struct seq_file *m, void *p)
 static int hc_show(struct seq_file *m, void *p)
 {
 	unsigned long h_num = (unsigned long)p;
-	struct hcall_stats *hs = (struct hcall_stats *)m->private;
+	struct hcall_stats *hs = m->private;
 
 	if (hs[h_num].num_calls) {
-		if (!cpu_has_feature(CPU_FTR_PURR))
+		if (cpu_has_feature(CPU_FTR_PURR))
 			seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
 				   hs[h_num].num_calls,
 				   hs[h_num].tb_total,
@@ -71,7 +72,7 @@ static int hc_show(struct seq_file *m, void *p)
 	return 0;
 }
 
-static struct seq_operations hcall_inst_seq_ops = {
+static const struct seq_operations hcall_inst_seq_ops = {
         .start = hc_start,
         .next  = hc_next,
         .stop  = hc_stop,
@@ -85,12 +86,12 @@ static int hcall_inst_seq_open(struct inode *inode, struct file *file)
 
 	rc = seq_open(file, &hcall_inst_seq_ops);
 	seq = file->private_data;
-	seq->private = file->f_dentry->d_inode->u.generic_ip;
+	seq->private = file_inode(file)->i_private;
 
 	return rc;
 }
 
-static struct file_operations hcall_inst_seq_fops = {
+static const struct file_operations hcall_inst_seq_fops = {
 	.open = hcall_inst_seq_open,
 	.read = seq_read,
 	.llseek = seq_lseek,
@@ -100,6 +101,33 @@ static struct file_operations hcall_inst_seq_fops = {
 #define	HCALL_ROOT_DIR		"hcall_inst"
 #define CPU_NAME_BUF_SIZE	32
 
+
+static void probe_hcall_entry(void *ignored, unsigned long opcode, unsigned long *args)
+{
+	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(void *ignored, unsigned long opcode, unsigned long retval,
+			     unsigned long *retbuf)
+{
+	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;
+}
+
 static int __init hcall_inst_init(void)
 {
 	struct dentry *hcall_root;
@@ -110,6 +138,14 @@ static int __init hcall_inst_init(void)
 	if (!firmware_has_feature(FW_FEATURE_LPAR))
 		return 0;
 
+	if (register_trace_hcall_entry(probe_hcall_entry, NULL))
+		return -EINVAL;
+
+	if (register_trace_hcall_exit(probe_hcall_exit, NULL)) {
+		unregister_trace_hcall_entry(probe_hcall_entry, NULL);
+		return -EINVAL;
+	}
+
 	hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
 	if (!hcall_root)
 		return -ENOMEM;