From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Linux PM <linux-pm@vger.kernel.org>,
Sudeep Holla <sudeep.holla@arm.com>,
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, 23 Jul 2019 15:15:24 +0100 [thread overview]
Message-ID: <20190723141524.GA22025@e121166-lin.cambridge.arm.com> (raw)
In-Reply-To: <CAPDyKFppc32r=3w3g5nmHWDR5qR1vxsYjQ1b_GQoc_Gk=ni24A@mail.gmail.com>
On Tue, Jul 23, 2019 at 01:46:56PM +0200, Ulf Hansson wrote:
> [...]
>
> > +++ b/drivers/cpuidle/cpuidle-psci.c
> > @@ -0,0 +1,150 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * PSCI CPU idle driver.
> > + *
> > + * Copyright (C) 2019 ARM Ltd.
> > + * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> > + */
> > +
> > +#define pr_fmt(fmt) "CPUidle PSCI: " 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/psci.h>
> > +#include <linux/slab.h>
> > +
> > +#include <asm/cpuidle.h>
>
> This should go away, right?
We need to pull in cpu_do_idle() so it will have to stay there.
> > +#include "dt_idle_states.h"
> > +
> > +static int psci_enter_idle_state(struct cpuidle_device *dev,
> > + struct cpuidle_driver *drv, int idx)
> > +{
> > + return CPU_PM_CPU_IDLE_ENTER(psci_cpu_suspend_enter, idx);
> > +}
> > +
> > +static struct cpuidle_driver psci_idle_driver __initdata = {
> > + .name = "psci_idle",
> > + .owner = THIS_MODULE,
> > + /*
> > + * PSCI idle states relies on architectural WFI to
> > + * be represented as state index 0.
> > + */
> > + .states[0] = {
> > + .enter = psci_enter_idle_state,
> > + .exit_latency = 1,
> > + .target_residency = 1,
> > + .power_usage = UINT_MAX,
> > + .name = "WFI",
> > + .desc = "ARM WFI",
> > + }
> > +};
> > +
> > +static const struct of_device_id psci_idle_state_match[] __initconst = {
> > + { .compatible = "arm,idle-state",
> > + .data = psci_enter_idle_state },
> > + { },
> > +};
> > +
> > +static int __init psci_idle_init_cpu(int cpu)
> > +{
> > + struct cpuidle_driver *drv;
> > + struct device_node *cpu_node;
> > + const char *enable_method;
> > + int ret = 0;
> > +
> > + drv = kmemdup(&psci_idle_driver, sizeof(*drv), GFP_KERNEL);
> > + if (!drv)
> > + return -ENOMEM;
> > +
> > + drv->cpumask = (struct cpumask *)cpumask_of(cpu);
> > +
> > + cpu_node = of_get_cpu_node(cpu, NULL);
> > + if (!cpu_node)
> > + return -ENODEV;
>
> You should free drv in case of error here (goto out_kfree_drv; etc).
>
> > +
> > + /*
> > + * Check whether the enable-method for the cpu is PSCI, fail
> > + * if it is not.
> > + */
> > + enable_method = of_get_property(cpu_node, "enable-method", NULL);
> > + if (!enable_method || (strcmp(enable_method, "psci")))
> > + ret = -ENODEV;
> > +
> > + of_node_put(cpu_node);
> > + if (ret)
> > + return ret;
>
> You should free drv in case of error here (goto out_kfree_drv;).
True on both cases, I missed that, thanks.
Lorenzo
> > +
> > + /*
> > + * Initialize idle states data, starting at index 1, since
> > + * by default idle state 0 is the quiescent state reached
> > + * by the cpu by executing the wfi instruction.
> > + *
> > + * If no DT idle states are detected (ret == 0) let the driver
> > + * initialization fail accordingly since there is no reason to
> > + * initialize the idle driver if only wfi is supported, the
> > + * default archictectural back-end already executes wfi
> > + * on idle entry.
> > + */
> > + ret = dt_init_idle_driver(drv, psci_idle_state_match, 1);
> > + if (ret <= 0) {
> > + ret = ret ? : -ENODEV;
> > + goto out_kfree_drv;
> > + }
> > +
> > + /*
> > + * Initialize PSCI idle states.
> > + */
> > + ret = psci_cpu_init_idle(cpu);
> > + if (ret) {
> > + pr_err("CPU %d failed to PSCI idle\n", cpu);
> > + goto out_kfree_drv;
> > + }
> > +
> > + ret = cpuidle_register(drv, NULL);
> > + if (ret)
> > + goto out_kfree_drv;
> > +
> > + return 0;
> > +
> > +out_kfree_drv:
> > + kfree(drv);
> > + return ret;
> > +}
> > +
>
> [...]
>
> Kind regards
> Uffe
next prev parent reply other threads:[~2019-07-23 14:15 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 [this message]
2019-08-06 16:10 ` Sudeep Holla
2019-08-06 16:34 ` Lorenzo Pieralisi
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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