1 /*
2  * arch/sh/oprofile/init.c
3  *
4  * Copyright (C) 2003 - 2010  Paul Mundt
5  *
6  * Based on arch/mips/oprofile/common.c:
7  *
8  *	Copyright (C) 2004, 2005 Ralf Baechle
9  *	Copyright (C) 2005 MIPS Technologies, Inc.
10  *
11  * This file is subject to the terms and conditions of the GNU General Public
12  * License.  See the file "COPYING" in the main directory of this archive
13  * for more details.
14  */
15 #include <linux/kernel.h>
16 #include <linux/oprofile.h>
17 #include <linux/init.h>
18 #include <linux/errno.h>
19 #include <linux/smp.h>
20 #include <linux/perf_event.h>
21 #include <linux/slab.h>
22 #include <asm/processor.h>
23 
24 extern void sh_backtrace(struct pt_regs * const regs, unsigned int depth);
25 
26 #ifdef CONFIG_HW_PERF_EVENTS
27 /*
28  * This will need to be reworked when multiple PMUs are supported.
29  */
30 static char *sh_pmu_op_name;
31 
op_name_from_perf_id(void)32 char *op_name_from_perf_id(void)
33 {
34 	return sh_pmu_op_name;
35 }
36 
oprofile_arch_init(struct oprofile_operations * ops)37 int __init oprofile_arch_init(struct oprofile_operations *ops)
38 {
39 	ops->backtrace = sh_backtrace;
40 
41 	if (perf_num_counters() == 0)
42 		return -ENODEV;
43 
44 	sh_pmu_op_name = kasprintf(GFP_KERNEL, "%s/%s",
45 				   UTS_MACHINE, perf_pmu_name());
46 	if (unlikely(!sh_pmu_op_name))
47 		return -ENOMEM;
48 
49 	return oprofile_perf_init(ops);
50 }
51 
oprofile_arch_exit(void)52 void oprofile_arch_exit(void)
53 {
54 	oprofile_perf_exit();
55 	kfree(sh_pmu_op_name);
56 }
57 #else
oprofile_arch_init(struct oprofile_operations * ops)58 int __init oprofile_arch_init(struct oprofile_operations *ops)
59 {
60 	ops->backtrace = sh_backtrace;
61 	return -ENODEV;
62 }
oprofile_arch_exit(void)63 void oprofile_arch_exit(void) {}
64 #endif /* CONFIG_HW_PERF_EVENTS */
65