From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: "linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Mark Rutland <Mark.Rutland@arm.com>,
Sudeep Holla <Sudeep.Holla@arm.com>,
Charles Garcia-Tobin <Charles.Garcia-Tobin@arm.com>,
Nicolas Pitre <nico@linaro.org>, Rob Herring <robh+dt@kernel.org>,
"grant.likely@linaro.org" <grant.likely@linaro.org>,
Peter De Schrijver <pdeschrijver@nvidia.com>,
Santosh Shilimkar <santosh.shilimkar@ti.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Amit Kucheria <amit.kucheria@linaro.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Antti Miettinen <ananaza@iki.fi>,
Stephen Boyd <sboyd@codeaurora.org>,
Kevin Hilman <khilman@linaro.org>,
Sebastian Capella <sebcape@gmail.com>,
Tomasz Figa <t.figa@samsung.com>, Mark Brown <broonie@kernel.org>
Subject: Re: [PATCH v7 6/8] drivers: cpuidle: CPU idle ARM64 driver
Date: Mon, 18 Aug 2014 23:30:23 +0100 [thread overview]
Message-ID: <20140818223023.GB5032@e102568-lin.cambridge.arm.com> (raw)
In-Reply-To: <20140818142143.GG20043@localhost>
On Mon, Aug 18, 2014 at 03:21:43PM +0100, Catalin Marinas wrote:
> On Wed, Aug 13, 2014 at 04:52:05PM +0100, Lorenzo Pieralisi wrote:
> > This patch implements a generic CPU idle driver for ARM64 machines.
> >
> > It relies on the DT idle states infrastructure to initialize idle
> > states count and respective parameters. Current code assumes the driver
> > is managing idle states on all possible CPUs but can be easily
> > generalized to support heterogenous systems and build cpumasks at
> > runtime using MIDRs or DT cpu nodes compatible properties.
> >
> > The driver relies on the arm64 CPU operations to call the idle
> > initialization hook used to parse and save suspend back-end specific
> > idle states information upon probing.
> >
> > Idle state index 0 is always initialized as a simple wfi state, ie always
> > considered present and functional on all ARM64 platforms.
> >
> > Idle state indices higher than 0 trigger idle state entry by calling
> > the cpu_suspend function, that triggers the suspend operation through
> > the CPU operations suspend back-end hook. cpu_suspend passes the idle
> > state index as a parameter so that the CPU operations suspend back-end
> > can retrieve the required idle state data by using the idle state
> > index to execute a look-up on its internal data structures.
> >
> > Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
> > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> > ---
> > drivers/cpuidle/Kconfig | 5 ++
> > drivers/cpuidle/Kconfig.arm64 | 14 +++++
> > drivers/cpuidle/Makefile | 4 ++
> > drivers/cpuidle/cpuidle-arm64.c | 131 ++++++++++++++++++++++++++++++++++++++++
> > 4 files changed, 154 insertions(+)
> > create mode 100644 drivers/cpuidle/Kconfig.arm64
> > create mode 100644 drivers/cpuidle/cpuidle-arm64.c
> >
> > diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig
> > index 8deb934..c5029c1 100644
> > --- a/drivers/cpuidle/Kconfig
> > +++ b/drivers/cpuidle/Kconfig
> > @@ -33,6 +33,11 @@ depends on ARM
> > source "drivers/cpuidle/Kconfig.arm"
> > endmenu
> >
> > +menu "ARM64 CPU Idle Drivers"
> > +depends on ARM64
> > +source "drivers/cpuidle/Kconfig.arm64"
> > +endmenu
> > +
> > menu "MIPS CPU Idle Drivers"
> > depends on MIPS
> > source "drivers/cpuidle/Kconfig.mips"
> > diff --git a/drivers/cpuidle/Kconfig.arm64 b/drivers/cpuidle/Kconfig.arm64
> > new file mode 100644
> > index 0000000..d0a08ed
> > --- /dev/null
> > +++ b/drivers/cpuidle/Kconfig.arm64
> > @@ -0,0 +1,14 @@
> > +#
> > +# ARM64 CPU Idle drivers
> > +#
> > +
> > +config ARM64_CPUIDLE
> > + bool "Generic ARM64 CPU idle Driver"
> > + select ARM64_CPU_SUSPEND
> > + select DT_IDLE_STATES
> > + help
> > + Select this to enable generic cpuidle driver for ARM64.
> > + It provides a generic idle driver whose idle states are configured
> > + at run-time through DT nodes. The CPUidle suspend backend is
> > + initialized by calling the CPU operations init idle hook
> > + provided by architecture code.
> > diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
> > index 002b653..4d177b9 100644
> > --- a/drivers/cpuidle/Makefile
> > +++ b/drivers/cpuidle/Makefile
> > @@ -23,6 +23,10 @@ obj-$(CONFIG_ARM_EXYNOS_CPUIDLE) += cpuidle-exynos.o
> > obj-$(CONFIG_MIPS_CPS_CPUIDLE) += cpuidle-cps.o
> >
> > ###############################################################################
> > +# ARM64 drivers
> > +obj-$(CONFIG_ARM64_CPUIDLE) += cpuidle-arm64.o
> > +
> > +###############################################################################
> > # POWERPC drivers
> > obj-$(CONFIG_PSERIES_CPUIDLE) += cpuidle-pseries.o
> > obj-$(CONFIG_POWERNV_CPUIDLE) += cpuidle-powernv.o
> > diff --git a/drivers/cpuidle/cpuidle-arm64.c b/drivers/cpuidle/cpuidle-arm64.c
> > new file mode 100644
> > index 0000000..25ec622
> > --- /dev/null
> > +++ b/drivers/cpuidle/cpuidle-arm64.c
> > @@ -0,0 +1,131 @@
> > +/*
> > + * ARM64 generic CPU idle driver.
> > + *
> > + * Copyright (C) 2014 ARM Ltd.
> > + * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> > + *
> > + * 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.
> > + */
> > +
> > +#define pr_fmt(fmt) "CPUidle arm64: " fmt
> > +
> > +#include <linux/cpuidle.h>
> > +#include <linux/cpumask.h>
> > +#include <linux/cpu_pm.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/slab.h>
> > +
> > +#include <asm/cpuidle.h>
> > +#include <asm/suspend.h>
> > +
> > +#include "dt_idle_states.h"
> > +
> > +/*
> > + * arm_enter_idle_state - Programs CPU to enter the specified state
> > + *
> > + * dev: cpuidle device
> > + * drv: cpuidle driver
> > + * idx: state index
> > + *
> > + * Called from the CPUidle framework to program the device to the
> > + * specified target state selected by the governor.
> > + */
> > +static int arm_enter_idle_state(struct cpuidle_device *dev,
> > + struct cpuidle_driver *drv, int idx)
>
> Nitpick: for consistency, I would either prefix it arm64 or drop the
> prefix entirely (it's a static function anyway).
Yes, that's right I will prefix it with arm64.
> > +struct cpuidle_driver arm64_idle_driver = {
>
> Should this be static?
Yes it should, I missed that, thanks.
> Otherwise:
>
> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Thank you !
Lorenzo
WARNING: multiple messages have this Message-ID (diff)
From: lorenzo.pieralisi@arm.com (Lorenzo Pieralisi)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v7 6/8] drivers: cpuidle: CPU idle ARM64 driver
Date: Mon, 18 Aug 2014 23:30:23 +0100 [thread overview]
Message-ID: <20140818223023.GB5032@e102568-lin.cambridge.arm.com> (raw)
In-Reply-To: <20140818142143.GG20043@localhost>
On Mon, Aug 18, 2014 at 03:21:43PM +0100, Catalin Marinas wrote:
> On Wed, Aug 13, 2014 at 04:52:05PM +0100, Lorenzo Pieralisi wrote:
> > This patch implements a generic CPU idle driver for ARM64 machines.
> >
> > It relies on the DT idle states infrastructure to initialize idle
> > states count and respective parameters. Current code assumes the driver
> > is managing idle states on all possible CPUs but can be easily
> > generalized to support heterogenous systems and build cpumasks at
> > runtime using MIDRs or DT cpu nodes compatible properties.
> >
> > The driver relies on the arm64 CPU operations to call the idle
> > initialization hook used to parse and save suspend back-end specific
> > idle states information upon probing.
> >
> > Idle state index 0 is always initialized as a simple wfi state, ie always
> > considered present and functional on all ARM64 platforms.
> >
> > Idle state indices higher than 0 trigger idle state entry by calling
> > the cpu_suspend function, that triggers the suspend operation through
> > the CPU operations suspend back-end hook. cpu_suspend passes the idle
> > state index as a parameter so that the CPU operations suspend back-end
> > can retrieve the required idle state data by using the idle state
> > index to execute a look-up on its internal data structures.
> >
> > Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
> > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> > ---
> > drivers/cpuidle/Kconfig | 5 ++
> > drivers/cpuidle/Kconfig.arm64 | 14 +++++
> > drivers/cpuidle/Makefile | 4 ++
> > drivers/cpuidle/cpuidle-arm64.c | 131 ++++++++++++++++++++++++++++++++++++++++
> > 4 files changed, 154 insertions(+)
> > create mode 100644 drivers/cpuidle/Kconfig.arm64
> > create mode 100644 drivers/cpuidle/cpuidle-arm64.c
> >
> > diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig
> > index 8deb934..c5029c1 100644
> > --- a/drivers/cpuidle/Kconfig
> > +++ b/drivers/cpuidle/Kconfig
> > @@ -33,6 +33,11 @@ depends on ARM
> > source "drivers/cpuidle/Kconfig.arm"
> > endmenu
> >
> > +menu "ARM64 CPU Idle Drivers"
> > +depends on ARM64
> > +source "drivers/cpuidle/Kconfig.arm64"
> > +endmenu
> > +
> > menu "MIPS CPU Idle Drivers"
> > depends on MIPS
> > source "drivers/cpuidle/Kconfig.mips"
> > diff --git a/drivers/cpuidle/Kconfig.arm64 b/drivers/cpuidle/Kconfig.arm64
> > new file mode 100644
> > index 0000000..d0a08ed
> > --- /dev/null
> > +++ b/drivers/cpuidle/Kconfig.arm64
> > @@ -0,0 +1,14 @@
> > +#
> > +# ARM64 CPU Idle drivers
> > +#
> > +
> > +config ARM64_CPUIDLE
> > + bool "Generic ARM64 CPU idle Driver"
> > + select ARM64_CPU_SUSPEND
> > + select DT_IDLE_STATES
> > + help
> > + Select this to enable generic cpuidle driver for ARM64.
> > + It provides a generic idle driver whose idle states are configured
> > + at run-time through DT nodes. The CPUidle suspend backend is
> > + initialized by calling the CPU operations init idle hook
> > + provided by architecture code.
> > diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
> > index 002b653..4d177b9 100644
> > --- a/drivers/cpuidle/Makefile
> > +++ b/drivers/cpuidle/Makefile
> > @@ -23,6 +23,10 @@ obj-$(CONFIG_ARM_EXYNOS_CPUIDLE) += cpuidle-exynos.o
> > obj-$(CONFIG_MIPS_CPS_CPUIDLE) += cpuidle-cps.o
> >
> > ###############################################################################
> > +# ARM64 drivers
> > +obj-$(CONFIG_ARM64_CPUIDLE) += cpuidle-arm64.o
> > +
> > +###############################################################################
> > # POWERPC drivers
> > obj-$(CONFIG_PSERIES_CPUIDLE) += cpuidle-pseries.o
> > obj-$(CONFIG_POWERNV_CPUIDLE) += cpuidle-powernv.o
> > diff --git a/drivers/cpuidle/cpuidle-arm64.c b/drivers/cpuidle/cpuidle-arm64.c
> > new file mode 100644
> > index 0000000..25ec622
> > --- /dev/null
> > +++ b/drivers/cpuidle/cpuidle-arm64.c
> > @@ -0,0 +1,131 @@
> > +/*
> > + * ARM64 generic CPU idle driver.
> > + *
> > + * Copyright (C) 2014 ARM Ltd.
> > + * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> > + *
> > + * 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.
> > + */
> > +
> > +#define pr_fmt(fmt) "CPUidle arm64: " fmt
> > +
> > +#include <linux/cpuidle.h>
> > +#include <linux/cpumask.h>
> > +#include <linux/cpu_pm.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/slab.h>
> > +
> > +#include <asm/cpuidle.h>
> > +#include <asm/suspend.h>
> > +
> > +#include "dt_idle_states.h"
> > +
> > +/*
> > + * arm_enter_idle_state - Programs CPU to enter the specified state
> > + *
> > + * dev: cpuidle device
> > + * drv: cpuidle driver
> > + * idx: state index
> > + *
> > + * Called from the CPUidle framework to program the device to the
> > + * specified target state selected by the governor.
> > + */
> > +static int arm_enter_idle_state(struct cpuidle_device *dev,
> > + struct cpuidle_driver *drv, int idx)
>
> Nitpick: for consistency, I would either prefix it arm64 or drop the
> prefix entirely (it's a static function anyway).
Yes, that's right I will prefix it with arm64.
> > +struct cpuidle_driver arm64_idle_driver = {
>
> Should this be static?
Yes it should, I missed that, thanks.
> Otherwise:
>
> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Thank you !
Lorenzo
next prev parent reply other threads:[~2014-08-18 22:30 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-13 15:51 [PATCH v7 0/8] ARM generic idle states Lorenzo Pieralisi
2014-08-13 15:51 ` Lorenzo Pieralisi
2014-08-13 15:52 ` [PATCH v7 1/8] arm64: kernel: refactor the CPU suspend API for retention states Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-18 7:47 ` Hanjun Guo
2014-08-18 7:47 ` Hanjun Guo
2014-08-18 14:20 ` Catalin Marinas
2014-08-18 14:20 ` Catalin Marinas
2014-08-13 15:52 ` [PATCH v7 2/8] Documentation: arm: define DT idle states bindings Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
[not found] ` <1407945127-27554-3-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2014-08-13 19:25 ` Lina Iyer
2014-08-13 19:25 ` Lina Iyer
2014-08-13 22:11 ` Lorenzo Pieralisi
2014-08-13 22:11 ` Lorenzo Pieralisi
2014-08-15 17:20 ` Lina Iyer
2014-08-15 17:20 ` Lina Iyer
2014-08-15 17:51 ` Lorenzo Pieralisi
2014-08-15 17:51 ` Lorenzo Pieralisi
2014-08-18 14:20 ` Catalin Marinas
2014-08-18 14:20 ` Catalin Marinas
2014-08-13 15:52 ` [PATCH v7 3/8] drivers: cpuidle: implement DT based idle states infrastructure Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-13 16:31 ` Nicolas Pitre
2014-08-13 16:31 ` Nicolas Pitre
2014-08-13 17:04 ` Lorenzo Pieralisi
2014-08-13 17:04 ` Lorenzo Pieralisi
2014-08-13 17:29 ` Nicolas Pitre
2014-08-13 17:29 ` Nicolas Pitre
2014-08-14 11:29 ` Lorenzo Pieralisi
2014-08-14 11:29 ` Lorenzo Pieralisi
2014-08-14 15:47 ` Nicolas Pitre
2014-08-14 15:47 ` Nicolas Pitre
2014-08-14 16:02 ` Lorenzo Pieralisi
2014-08-14 16:02 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
2014-08-13 15:52 ` [PATCH v7 4/8] arm64: kernel: introduce cpu_init_idle CPU operation Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
[not found] ` <1407945127-27554-1-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2014-08-13 15:52 ` [PATCH v7 5/8] arm64: add PSCI CPU_SUSPEND based cpu_suspend support Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
2014-08-13 15:52 ` [PATCH v7 6/8] drivers: cpuidle: CPU idle ARM64 driver Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 22:30 ` Lorenzo Pieralisi [this message]
2014-08-18 22:30 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 22:25 ` Lorenzo Pieralisi
2014-08-18 22:25 ` Lorenzo Pieralisi
2014-08-13 15:52 ` [PATCH v7 7/8] drivers: cpuidle: initialize big.LITTLE driver through DT Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-18 14:21 ` Catalin Marinas
2014-08-18 14:21 ` Catalin Marinas
2014-08-13 15:52 ` [PATCH v7 8/8] drivers: cpuidle: initialize Exynos " Lorenzo Pieralisi
2014-08-13 15:52 ` Lorenzo Pieralisi
2014-08-15 21:12 ` Lina Iyer
2014-08-15 21:12 ` Lina Iyer
2014-08-15 21:40 ` Lorenzo Pieralisi
2014-08-15 21:40 ` Lorenzo Pieralisi
2014-08-15 21:45 ` Lina Iyer
2014-08-15 21:45 ` Lina Iyer
2014-08-15 21:52 ` Lorenzo Pieralisi
2014-08-15 21:52 ` Lorenzo Pieralisi
2014-08-18 14:22 ` Catalin Marinas
2014-08-18 14:22 ` Catalin Marinas
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