perf counters: clean up 'raw' type API

Impact: cleanup

Introduce a separate hw_event type.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

include/linux/perf_counter.h

@@ -38,6 +38,7 @@ enum hw_event_types {
 	 * If this bit is set in the type, then trigger NMI sampling:
 	 */
 	PERF_COUNT_NMI			= (1 << 30),
+	PERF_COUNT_RAW			= (1 << 31),
 };
 
 /*
@@ -49,6 +50,12 @@ enum perf_record_type {
 	PERF_RECORD_GROUP,
 };
 
+struct perf_counter_event {
+	u32			hw_event_type;
+	u32			hw_event_period;
+	u64			hw_raw_ctrl;
+};
+
 /**
  * struct hw_perf_counter - performance counter hardware details
  */

include/linux/syscalls.h

@@ -54,6 +54,7 @@ struct compat_stat;
 struct compat_timeval;
 struct robust_list_head;
 struct getcpu_cache;
+struct perf_counter_event;
 
 #include <linux/types.h>
 #include <linux/aio_abi.h>
@@ -625,9 +626,6 @@ asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len);
 int kernel_execve(const char *filename, char *const argv[], char *const envp[]);
 
 asmlinkage int
-sys_perf_counter_open(u32 hw_event_type,
-		      u32 hw_event_period,
-		      u32 record_type,
-		      pid_t pid,
-		      int cpu);
+sys_perf_counter_open(struct perf_counter_event __user *uevent, u32 record_type,
+		      pid_t pid, int cpu, int masterfd);
 #endif

kernel/perf_counter.c

@@ -734,26 +734,27 @@ perf_counter_alloc(u32 hw_event_period, int cpu, u32 record_type)
  * @pid:		target pid
  */
 asmlinkage int
-sys_perf_counter_open(u32 hw_event_type,
-		      u32 hw_event_period,
-		      u32 record_type,
-		      pid_t pid,
-		      int cpu)
+sys_perf_counter_open(struct perf_counter_event __user *uevent, u32 record_type,
+		      pid_t pid, int cpu, int masterfd)
 {
 	struct perf_counter_context *ctx;
+	struct perf_counter_event event;
 	struct perf_counter *counter;
 	int ret;
 
+	if (copy_from_user(&event, uevent, sizeof(event)) != 0)
+		return -EFAULT;
+
 	ctx = find_get_context(pid, cpu);
 	if (IS_ERR(ctx))
 		return PTR_ERR(ctx);
 
 	ret = -ENOMEM;
-	counter = perf_counter_alloc(hw_event_period, cpu, record_type);
+	counter = perf_counter_alloc(event.hw_event_period, cpu, record_type);
 	if (!counter)
 		goto err_put_context;
 
-	ret = hw_perf_counter_init(counter, hw_event_type);
+	ret = hw_perf_counter_init(counter, event.hw_event_type);
 	if (ret)
 		goto err_free_put_context;