14f7001284
This patch provides the skeleton of the HW perf event support. To enable this feature, we can not choose the SMTC kernel; Oprofile should be disabled; kernel performance events be selected. Then we can enable it in Kernel type menu. Oprofile for MIPS platforms initializes irq at arch init time. Currently we do not change this logic to allow PMU reservation. If a platform has EIC, we can use the irq base and perf counter irq offset defines for the interrupt controller in specific init_hw_perf_events(). Based on this skeleton patch, the 3 different kinds of MIPS PMU, namely, mipsxx/loongson2/rm9000, can be supported by adding corresponding lower level C files at the bottom. The suggested names of these files are perf_event_mipsxx.c/perf_event_loongson2.c/perf_event_rm9000.c. So, for example, we can do this by adding "#include perf_event_mipsxx.c" at the bottom of perf_event.c. In addition, PMUs with 64bit counters are also considered in this patch. Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com> To: linux-mips@linux-mips.org Cc: a.p.zijlstra@chello.nl Cc: paulus@samba.org Cc: mingo@elte.hu Cc: acme@redhat.com Cc: jamie.iles@picochip.com Cc: ddaney@caviumnetworks.com Cc: matt@console-pimps.org Patchwork: https://patchwork.linux-mips.org/patch/1688/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
25 lines
654 B
C
25 lines
654 B
C
/*
|
|
* linux/arch/mips/include/asm/perf_event.h
|
|
*
|
|
* Copyright (C) 2010 MIPS Technologies, Inc.
|
|
* Author: Deng-Cheng Zhu
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#ifndef __MIPS_PERF_EVENT_H__
|
|
#define __MIPS_PERF_EVENT_H__
|
|
|
|
/*
|
|
* MIPS performance counters do not raise NMI upon overflow, a regular
|
|
* interrupt will be signaled. Hence we can do the pending perf event
|
|
* work at the tail of the irq handler.
|
|
*/
|
|
static inline void
|
|
set_perf_event_pending(void)
|
|
{
|
|
}
|
|
|
|
#endif /* __MIPS_PERF_EVENT_H__ */
|