diff options
| author | Andrew Bresticker <abrestic@chromium.org> | 2014-09-18 14:47:12 -0700 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-11-24 07:44:53 +0100 |
| commit | a669efc4a3b49de9226b280bb683f5b1d5a5d143 (patch) | |
| tree | b4466902e1496aee220fbaf4dbf0be1f0247cf7e /arch/mips/ath79 | |
| parent | 079a4601768e248ba89dd08d4953e6dae607d7bd (diff) | |
MIPS: Add hook to get C0 performance counter interrupt
The hardware perf event driver and oprofile interpret the global
cp0_perfcount_irq differently: in the hardware perf event driver
it is an offset from MIPS_CPU_IRQ_BASE and in oprofile it is the
actual IRQ number. This still works most of the time since
MIPS_CPU_IRQ_BASE is usually 0, but is clearly wrong. Since the
performance counter interrupt may vary from platform to platform
like the C0 timer interrupt, add the optional get_c0_perfcount_int
hook which returns the IRQ number of the performance counter.
The hook should return < 0 if the performance counter interrupt is
shared with the timer. If the hook is not present, the CPU vector
reported in C0_IntCtl (cp0_perfcount_irq) is used.
Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Reviewed-by: Qais Yousef <qais.yousef@imgtec.com>
Tested-by: Qais Yousef <qais.yousef@imgtec.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: Jeffrey Deans <jeffrey.deans@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: Jonas Gorski <jogo@openwrt.org>
Cc: John Crispin <blogic@openwrt.org>
Cc: David Daney <ddaney.cavm@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7805/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/ath79')
| -rw-r--r-- | arch/mips/ath79/irq.c | 1 | ||||
| -rw-r--r-- | arch/mips/ath79/setup.c | 5 |
2 files changed, 5 insertions, 1 deletions
diff --git a/arch/mips/ath79/irq.c b/arch/mips/ath79/irq.c index 9c0e1761773f..6adae366f11a 100644 --- a/arch/mips/ath79/irq.c +++ b/arch/mips/ath79/irq.c @@ -359,7 +359,6 @@ void __init arch_init_irq(void) BUG(); } - cp0_perfcount_irq = ATH79_MISC_IRQ(5); mips_cpu_irq_init(); ath79_misc_irq_init(); diff --git a/arch/mips/ath79/setup.c b/arch/mips/ath79/setup.c index 64807a4809d0..a73c93c3d44a 100644 --- a/arch/mips/ath79/setup.c +++ b/arch/mips/ath79/setup.c @@ -182,6 +182,11 @@ const char *get_system_type(void) return ath79_sys_type; } +int get_c0_perfcount_int(void) +{ + return ATH79_MISC_IRQ(5); +} + unsigned int get_c0_compare_int(void) { return CP0_LEGACY_COMPARE_IRQ; |