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alpha: implement HW performance events on the EV67 and later CPUs

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This implements hardware performance events for the EV67 and later CPUs
within the Linux performance events subsystem.  Only using the performance
monitoring unit in HP/Compaq's so called "Aggregrate mode" is supported.

The code has been implemented in a manner that makes extension to other
older Alpha CPUs relatively straightforward should some mug wish to
indulge themselves.

Signed-off-by: Michael Cree <mcree@orcon.net.nz>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jay Estabrook <jay.estabrook@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Cree
2010-08-09 17:20:08 -07:00
committed by Linus Torvalds
parent 92484f10ca
commit 979f867191
5 changed files with 879 additions and 1 deletions
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26
arch/alpha/kernel/time.c
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@ -41,6 +41,7 @@
#include <linux/init.h>
#include <linux/bcd.h>
#include <linux/profile.h>
#include <linux/perf_event.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@ -82,6 +83,26 @@ static struct {
unsigned long est_cycle_freq;
#ifdef CONFIG_PERF_EVENTS
DEFINE_PER_CPU(u8, perf_event_pending);
#define set_perf_event_pending_flag() __get_cpu_var(perf_event_pending) = 1
#define test_perf_event_pending() __get_cpu_var(perf_event_pending)
#define clear_perf_event_pending() __get_cpu_var(perf_event_pending) = 0
void set_perf_event_pending(void)
{
set_perf_event_pending_flag();
}
#else /* CONFIG_PERF_EVENTS */
#define test_perf_event_pending() 0
#define clear_perf_event_pending()
#endif /* CONFIG_PERF_EVENTS */
static inline __u32 rpcc(void)
{
@ -175,6 +196,11 @@ irqreturn_t timer_interrupt(int irq, void *dev)
update_process_times(user_mode(get_irq_regs()));
#endif
if (test_perf_event_pending()) {
clear_perf_event_pending();
perf_event_do_pending();
}
return IRQ_HANDLED;
}