From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: linux-pm@vger.kernel.org, Ulf Hansson <ulf.hansson@linaro.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Mark Rutland <mark.rutland@arm.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
LAKML <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 4/6] ARM: psci: cpuidle: Introduce PSCI CPUidle driver
Date: Tue, 6 Aug 2019 17:34:11 +0100 [thread overview]
Message-ID: <20190806163411.GC15498@e121166-lin.cambridge.arm.com> (raw)
In-Reply-To: <20190806161033.GD16546@e107155-lin>
On Tue, Aug 06, 2019 at 05:10:33PM +0100, Sudeep Holla wrote:
> On Mon, Jul 22, 2019 at 04:37:43PM +0100, Lorenzo Pieralisi wrote:
> > PSCI firmware is the standard power management control for
> > all ARM64 based platforms and it is also deployed on some
> > ARM 32 bit platforms to date.
> >
> > Idle state entry in PSCI is currently achieved by calling
> > arm_cpuidle_init() and arm_cpuidle_suspend() in a generic
> > idle driver, which in turn relies on ARM/ARM64 CPUidle back-end
> > to relay the call into PSCI firmware if PSCI is the boot method.
> >
> > Given that PSCI is the standard idle entry method on ARM64 systems
> > (which means that no other CPUidle driver are expected on ARM64
> > platforms - so PSCI is already a generic idle driver), in order to
> > simplify idle entry and code maintenance, it makes sense to have a PSCI
> > specific idle driver so that idle code that it is currently living in
> > drivers/firmware directory can be hoisted out of it and moved
> > where it belongs, into a full-fledged PSCI driver, leaving PSCI code
> > in drivers/firmware as a pure firmware interface, as it should be.
> >
> > Implement a PSCI CPUidle driver. By default it is a silent Kconfig entry
> > which is left unselected, since it selection would clash with the
> > generic ARM CPUidle driver that provides a PSCI based idle driver
> > through the arm/arm64 arches back-ends CPU operations.
> >
> > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> > Cc: Ulf Hansson <ulf.hansson@linaro.org>
> > Cc: Sudeep Holla <sudeep.holla@arm.com>
>
> Once the error path issues pointed by Ulf are resolved,
>
> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
>
> > Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
> > Cc: Mark Rutland <mark.rutland@arm.com>
> > Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> > ---
> > MAINTAINERS | 8 ++
> > drivers/cpuidle/Kconfig.arm | 3 +
> > drivers/cpuidle/Makefile | 1 +
> > drivers/cpuidle/cpuidle-psci.c | 150 +++++++++++++++++++++++++++++++++
> > 4 files changed, 162 insertions(+)
> > create mode 100644 drivers/cpuidle/cpuidle-psci.c
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 783569e3c4b4..c2bf8ce65e83 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -4286,6 +4286,14 @@ S: Supported
> > F: drivers/cpuidle/cpuidle-exynos.c
> > F: arch/arm/mach-exynos/pm.c
> >
> > +CPUIDLE DRIVER - ARM PSCI
> > +M: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> > +M: Sudeep Holla <sudeep.holla@arm.com>
> > +L: linux-pm@vger.kernel.org
> > +L: linux-arm-kernel@lists.infradead.org
> > +S: Supported
> > +F: drivers/cpuidle/cpuidle-psci.c
> > +
> > CPU IDLE TIME MANAGEMENT FRAMEWORK
> > M: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> > M: Daniel Lezcano <daniel.lezcano@linaro.org>
> > diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
> > index 48cb3d4bb7d1..929b57424ea4 100644
> > --- a/drivers/cpuidle/Kconfig.arm
> > +++ b/drivers/cpuidle/Kconfig.arm
> > @@ -13,6 +13,9 @@ config ARM_CPUIDLE
> > initialized by calling the CPU operations init idle hook
> > provided by architecture code.
> >
> > +config ARM_PSCI_CPUIDLE
> > + bool
> > +
>
> [nit] I understand the intention to keep it hidden, but can't we have
> the dependency and selection of other config as part of this patch to
> make it more complete ?
Yes we can, it makes sense.
Thanks,
Lorenzo
next prev parent reply other threads:[~2019-08-06 16:34 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-22 15:37 [PATCH 0/6] ARM: psci: cpuidle: PSCI CPUidle rework Lorenzo Pieralisi
2019-07-22 15:37 ` [PATCH 1/6] ARM: cpuidle: Remove useless header include Lorenzo Pieralisi
2019-08-06 15:51 ` Sudeep Holla
2019-08-07 8:19 ` Daniel Lezcano
2019-07-22 15:37 ` [PATCH 2/6] ARM: cpuidle: Remove overzealous error logging Lorenzo Pieralisi
2019-08-06 15:51 ` Sudeep Holla
2019-08-07 8:20 ` Daniel Lezcano
2019-07-22 15:37 ` [PATCH 3/6] drivers: firmware: psci: Decouple checker from generic ARM CPUidle Lorenzo Pieralisi
2019-08-06 15:54 ` Sudeep Holla
2019-08-07 14:09 ` Daniel Lezcano
2019-07-22 15:37 ` [PATCH 4/6] ARM: psci: cpuidle: Introduce PSCI CPUidle driver Lorenzo Pieralisi
2019-07-23 11:46 ` Ulf Hansson
2019-07-23 14:15 ` Lorenzo Pieralisi
2019-08-06 16:10 ` Sudeep Holla
2019-08-06 16:34 ` Lorenzo Pieralisi [this message]
2019-08-07 16:30 ` Daniel Lezcano
2019-07-22 15:37 ` [PATCH 5/6] ARM: psci: cpuidle: Enable " Lorenzo Pieralisi
2019-08-06 16:16 ` Sudeep Holla
2019-08-06 16:40 ` Lorenzo Pieralisi
2019-07-22 15:37 ` [PATCH 6/6] PSCI: cpuidle: Refactor CPU suspend power_state parameter handling Lorenzo Pieralisi
2019-07-23 11:47 ` Ulf Hansson
2019-08-07 18:09 ` Daniel Lezcano
2019-08-08 12:55 ` Sudeep Holla
2019-08-08 15:29 ` Ulf Hansson
2019-08-08 16:04 ` Sudeep Holla
2019-07-23 11:49 ` [PATCH 0/6] ARM: psci: cpuidle: PSCI CPUidle rework Ulf Hansson
2019-07-23 14:19 ` Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 0/8] " Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 1/8] ARM: cpuidle: Remove useless header include Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 2/8] ARM: cpuidle: Remove overzealous error logging Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 3/8] drivers: firmware: psci: Decouple checker from generic ARM CPUidle Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 4/8] ARM: psci: cpuidle: Introduce PSCI CPUidle driver Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 5/8] ARM: psci: cpuidle: Enable " Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 6/8] PSCI: cpuidle: Refactor CPU suspend power_state parameter handling Lorenzo Pieralisi
2019-08-09 11:03 ` [PATCH v2 7/8] arm64: defconfig: Enable the PSCI CPUidle driver Lorenzo Pieralisi
2019-08-09 16:53 ` Will Deacon
2019-08-09 11:03 ` [PATCH v2 8/8] ARM: imx_v6_v7_defconfig: " Lorenzo Pieralisi
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