[patch V2 47/67] arm/l2c: Convert to hotplug state machine
Anna-Maria Gleixner
anna-maria at linutronix.de
Wed Jul 13 10:16:50 PDT 2016
From: Richard Cochran <rcochran at linutronix.de>
Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.
Signed-off-by: Richard Cochran <rcochran at linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
Cc: Brad Mouring <brad.mouring at ni.com>
Cc: Linus Torvalds <torvalds at linux-foundation.org>
Cc: Linus Walleij <linus.walleij at linaro.org>
Cc: Marek Szyprowski <m.szyprowski at samsung.com>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Rob Herring <robh at kernel.org>
Cc: Russell King <linux at arm.linux.org.uk>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: linux-arm-kernel at lists.infradead.org
Signed-off-by: Anna-Maria Gleixner <anna-maria at linutronix.de>
---
arch/arm/mm/cache-l2x0.c | 27 +++++++++++++--------------
include/linux/cpuhotplug.h | 1 +
2 files changed, 14 insertions(+), 14 deletions(-)
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index c61996c..cc12905 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -597,17 +597,16 @@ static void l2c310_configure(void __iomem *base)
L310_POWER_CTRL);
}
-static int l2c310_cpu_enable_flz(struct notifier_block *nb, unsigned long act, void *data)
+static int l2c310_starting_cpu(unsigned int cpu)
{
- switch (act & ~CPU_TASKS_FROZEN) {
- case CPU_STARTING:
- set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1));
- break;
- case CPU_DYING:
- set_auxcr(get_auxcr() & ~(BIT(3) | BIT(2) | BIT(1)));
- break;
- }
- return NOTIFY_OK;
+ set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1));
+ return 0;
+}
+
+static int l2c310_dying_cpu(unsigned int cpu)
+{
+ set_auxcr(get_auxcr() & ~(BIT(3) | BIT(2) | BIT(1)));
+ return 0;
}
static void __init l2c310_enable(void __iomem *base, unsigned num_lock)
@@ -678,10 +677,10 @@ static void __init l2c310_enable(void __iomem *base, unsigned num_lock)
power_ctrl & L310_STNDBY_MODE_EN ? "en" : "dis");
}
- if (aux & L310_AUX_CTRL_FULL_LINE_ZERO) {
- set_auxcr(get_auxcr() | BIT(3) | BIT(2) | BIT(1));
- cpu_notifier(l2c310_cpu_enable_flz, 0);
- }
+ if (aux & L310_AUX_CTRL_FULL_LINE_ZERO)
+ cpuhp_setup_state(CPUHP_AP_ARM_L2X0_STARTING,
+ "AP_ARM_L2X0_STARTING", l2c310_starting_cpu,
+ l2c310_dying_cpu);
}
static void __init l2c310_fixup(void __iomem *base, u32 cache_id,
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 5c66102..1876377 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -38,6 +38,7 @@ enum cpuhp_state {
CPUHP_AP_PERF_METAG_STARTING,
CPUHP_AP_ARM_VFP_STARTING,
CPUHP_AP_PERF_ARM_STARTING,
+ CPUHP_AP_ARM_L2X0_STARTING,
CPUHP_AP_ARM_ARCH_TIMER_STARTING,
CPUHP_AP_DUMMY_TIMER_STARTING,
CPUHP_AP_METAG_TIMER_STARTING,
--
2.8.1
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