From: agross@codeaurora•org (Andy Gross)
To: linux-arm-kernel@lists•infradead.org
Subject: [RFC PATCH v15 01/11] ARM: cpuidle: Register per cpuidle device
Date: Mon, 9 Mar 2015 16:29:26 -0500 [thread overview]
Message-ID: <20150309212926.GB17839@qualcomm.com> (raw)
In-Reply-To: <1425914206-22295-2-git-send-email-lina.iyer@linaro.org>
On Mon, Mar 09, 2015 at 09:16:36AM -0600, Lina Iyer wrote:
> From: Daniel Lezcano <daniel.lezcano@linaro•org>
>
> Some architectures have some cpus which does not support idle states.
>
> Let the underlying low level code to return -ENOSYS when it is not
> possible to set an idle state.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro•org>
> Signed-off-by: Lina Iyer <lina.iyer@linaro•org>
> [Minor clean ups and fixes of the per-cpu variable]
> ---
> drivers/cpuidle/cpuidle-arm.c | 34 +++++++++++++++++++++++++++++++++-
> 1 file changed, 33 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c
> index 1c94b88..f7cdb73 100644
> --- a/drivers/cpuidle/cpuidle-arm.c
> +++ b/drivers/cpuidle/cpuidle-arm.c
> @@ -17,11 +17,14 @@
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/of.h>
> +#include <linux/slab.h>
>
> #include <asm/cpuidle.h>
>
> #include "dt_idle_states.h"
>
> +static DEFINE_PER_CPU(struct cpuidle_device, *cpuidle_arm_dev);
> +
> /*
> * arm_enter_idle_state - Programs CPU to enter the specified state
> *
> @@ -93,6 +96,7 @@ static const struct of_device_id arm_idle_state_match[] __initconst = {
> static int __init arm_idle_init(void)
> {
> int cpu, ret;
> + struct cpuidle_device *dev;
> struct cpuidle_driver *drv = &arm_idle_driver;
>
> /*
> @@ -105,18 +109,46 @@ static int __init arm_idle_init(void)
> if (ret <= 0)
> return ret ? : -ENODEV;
>
> +
> + ret = cpuidle_register_driver(drv);
> + if (ret) {
> + pr_err("Failed to register cpuidle driver\n");
> + return ret;
> + }
> +
> /*
> * Call arch CPU operations in order to initialize
> * idle states suspend back-end specific data
> */
> for_each_possible_cpu(cpu) {
> +
> ret = arm_cpuidle_init(cpu);
> + /*
> + * This cpu does not support any idle states
> + */
> + if (ret == -ENOSYS)
> + continue;
> +
> if (ret) {
> pr_err("CPU %d failed to init idle CPU ops\n", cpu);
> return ret;
> }
> +
> + dev = kzalloc(sizeof(*dev), GFP_KERNEL);
devm_kzalloc? Otherwise, failures could lead to lost memory.
> + if (!dev)
> + return -ENOMEM;
> +
> + dev->cpu = cpu;
> + ret = cpuidle_register_device(dev);
> + if (ret) {
> + pr_err("Failed to register cpuidle device for CPU %d\n",
> + cpu);
> + return ret;
> + }
> +
> + per_cpu(cpuidle_arm_dev, cpu) = dev;
> }
>
> - return cpuidle_register(drv, NULL);
> + return 0;
> }
> device_initcall(arm_idle_init);
> --
> 2.1.0
>
> --
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--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2015-03-09 21:29 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-09 15:16 [RFC PATCH v15 00/11] ARM: qcom: cpuidle support for 8064, 8074, 8084 Lina Iyer
2015-03-09 15:16 ` [RFC PATCH v15 01/11] ARM: cpuidle: Register per cpuidle device Lina Iyer
2015-03-09 21:29 ` Andy Gross [this message]
2015-03-09 21:40 ` Lina Iyer
2015-03-09 22:04 ` Andy Gross
2015-03-10 10:37 ` Russell King - ARM Linux
2015-03-10 14:57 ` Lina Iyer
2015-03-09 15:16 ` [RFC PATCH v15 02/11] ARM: qcom: Add Subsystem Power Manager (SPM) driver Lina Iyer
2015-03-10 17:26 ` Kumar Gala
2015-03-10 18:51 ` Lina Iyer
2015-03-12 22:50 ` Lina Iyer
2015-03-16 21:51 ` Stephen Boyd
2015-03-16 22:51 ` Lina Iyer
2015-03-09 15:16 ` [PATCH v15 03/11] ARM: cpuidle: qcom: Add documentation for qcom cpuidle states Lina Iyer
2015-03-09 15:16 ` [RFC PATCH v15 04/11] ARM: cpuidle: Register cpuidle_ops for QCOM cpus Lina Iyer
2015-03-11 18:16 ` Stephen Boyd
2015-03-12 12:34 ` Daniel Lezcano
2015-03-12 15:06 ` Lina Iyer
2015-03-13 9:57 ` Daniel Lezcano
2015-03-09 15:16 ` [PATCH v15 05/11] ARM: dts: qcom: Add power-controller device node for 8074 Krait CPUs Lina Iyer
2015-03-09 15:16 ` [PATCH v15 06/11] ARM: dts: qcom: Add power-controller device node for 8084 " Lina Iyer
2015-03-09 15:16 ` [PATCH v15 07/11] ARM: dts: qcom: Update power-controller device node for 8064 " Lina Iyer
2015-03-09 15:16 ` [PATCH v15 08/11] ARM: dts: qcom: Add idle states device nodes for 8074 Lina Iyer
2015-03-09 15:16 ` [PATCH v15 09/11] ARM: dts: qcom: Add idle states device nodes for 8084 Lina Iyer
2015-03-09 15:16 ` [PATCH v15 10/11] ARM: dts: qcom: Add idle state device nodes for 8064 Lina Iyer
2015-03-09 15:16 ` [PATCH v15 11/11] ARM: qcom: Update defconfig Lina Iyer
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