From: Sudeep Holla <sudeep.holla@arm.com>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: "Rafael J . Wysocki" <rjw@rjwysocki.net>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Lina Iyer <ilina@codeaurora.org>,
linux-pm@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Stephen Boyd <sboyd@kernel.org>, Andy Gross <agross@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Kevin Hilman <khilman@kernel.org>,
Sudeep Holla <sudeep.holla@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH v2 09/13] cpuidle: psci: Attach CPU devices to their PM domains
Date: Fri, 15 Nov 2019 17:15:55 +0000 [thread overview]
Message-ID: <20191115171555.GD27170@bogus> (raw)
In-Reply-To: <20191029164438.17012-10-ulf.hansson@linaro.org>
On Tue, Oct 29, 2019 at 05:44:34PM +0100, Ulf Hansson wrote:
> In order to enable a CPU to be power managed through its PM domain, let's
> try to attach it by calling psci_dt_attach_cpu() during the cpuidle
> initialization.
>
> psci_dt_attach_cpu() returns a pointer to the attached struct device, which
> later should be used for runtime PM, hence we need to store it somewhere.
> Rather than adding yet another per CPU variable, let's create a per CPU
> struct to collect the relevant per CPU variables.
>
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
>
> Changes in v2:
> - Rebased.
>
> ---
> drivers/cpuidle/cpuidle-psci.c | 24 ++++++++++++++++++++----
> 1 file changed, 20 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/cpuidle/cpuidle-psci.c b/drivers/cpuidle/cpuidle-psci.c
> index 830995b8a56f..167249d0493f 100644
> --- a/drivers/cpuidle/cpuidle-psci.c
> +++ b/drivers/cpuidle/cpuidle-psci.c
> @@ -20,14 +20,20 @@
>
> #include <asm/cpuidle.h>
>
> +#include "cpuidle-psci.h"
> #include "dt_idle_states.h"
>
> -static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state);
> +struct psci_cpuidle_data {
> + u32 *psci_states;
> + struct device *dev;
> +};
> +
> +static DEFINE_PER_CPU_READ_MOSTLY(struct psci_cpuidle_data, psci_cpuidle_data);
>
> static int psci_enter_idle_state(struct cpuidle_device *dev,
> struct cpuidle_driver *drv, int idx)
> {
> - u32 *state = __this_cpu_read(psci_power_state);
> + u32 *state = __this_cpu_read(psci_cpuidle_data.psci_states);
>
> return CPU_PM_CPU_IDLE_ENTER_PARAM(psci_cpu_suspend_enter,
> idx, state[idx]);
> @@ -78,7 +84,9 @@ static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node,
> {
> int i, ret = 0;
> u32 *psci_states;
> + struct device *dev;
> struct device_node *state_node;
> + struct psci_cpuidle_data *data = per_cpu_ptr(&psci_cpuidle_data, cpu);
>
> state_count++; /* Add WFI state too */
> psci_states = kcalloc(state_count, sizeof(*psci_states), GFP_KERNEL);
> @@ -104,8 +112,16 @@ static int __init psci_dt_cpu_init_idle(struct device_node *cpu_node,
> goto free_mem;
> }
>
> - /* Idle states parsed correctly, initialize per-cpu pointer */
> - per_cpu(psci_power_state, cpu) = psci_states;
> + dev = psci_dt_attach_cpu(cpu);
Why do we need to call psci_dt_attach_cpu for even PC mode and ...
> + if (IS_ERR(dev)) {
> + ret = PTR_ERR(dev);
> + goto free_mem;
> + }
> +
> + data->dev = dev;
> +
... assign NULL above. I don't see the need for one. Default it will be
NULL anyway and we can call psci_dt_attach_cpu only if psci_has_osi_support()
I will look through further patches to see if it make sense or not.
--
Regards,
Sudeep
next prev parent reply other threads:[~2019-11-15 17:16 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-29 16:44 [PATCH v2 00/13] cpuidle: psci: Support hierarchical CPU arrangement Ulf Hansson
2019-10-29 16:44 ` [PATCH v2 01/13] cpuidle: psci: Align psci_power_state count with idle state count Ulf Hansson
2019-10-29 16:44 ` [PATCH v2 02/13] dt: psci: Update DT bindings to support hierarchical PSCI states Ulf Hansson
2019-11-15 17:12 ` Sudeep Holla
2019-11-19 15:15 ` Ulf Hansson
2019-10-29 16:44 ` [PATCH v2 03/13] firmware: psci: Export functions to manage the OSI mode Ulf Hansson
2019-10-29 16:44 ` [PATCH v2 04/13] of: base: Add of_get_cpu_state_node() to get idle states for a CPU node Ulf Hansson
2019-10-29 16:44 ` [PATCH v2 05/13] cpuidle: dt: Support hierarchical CPU idle states Ulf Hansson
2019-10-29 16:44 ` [PATCH v2 06/13] cpuidle: psci: Simplify OF parsing of CPU idle state nodes Ulf Hansson
2019-11-15 17:13 ` Sudeep Holla
2019-10-29 16:44 ` [PATCH v2 07/13] cpuidle: psci: Support hierarchical CPU idle states Ulf Hansson
2019-10-29 16:44 ` [PATCH v2 08/13] cpuidle: psci: Add a helper to attach a CPU to its PM domain Ulf Hansson
2019-11-07 9:13 ` Niklas Cassel
2019-11-07 10:22 ` Ulf Hansson
2019-11-11 11:36 ` Niklas Cassel
2019-11-15 17:13 ` Sudeep Holla
2019-11-18 12:28 ` Ulf Hansson
2019-10-29 16:44 ` [PATCH v2 09/13] cpuidle: psci: Attach CPU devices to their PM domains Ulf Hansson
2019-11-15 17:15 ` Sudeep Holla [this message]
2019-11-18 12:50 ` Ulf Hansson
2019-10-29 16:44 ` [PATCH v2 10/13] cpuidle: psci: Prepare to use OS initiated suspend mode via " Ulf Hansson
2019-11-15 17:30 ` Sudeep Holla
2019-11-18 13:37 ` Ulf Hansson
2019-11-22 18:26 ` Lorenzo Pieralisi
2019-11-25 10:44 ` Ulf Hansson
2019-10-29 16:44 ` [PATCH v2 11/13] cpuidle: psci: Manage runtime PM in the idle path Ulf Hansson
2019-11-15 17:32 ` Sudeep Holla
2019-10-29 16:44 ` [PATCH v2 12/13] cpuidle: psci: Add support for PM domains by using genpd Ulf Hansson
2019-10-29 16:44 ` [PATCH v2 13/13] arm64: dts: Convert to the hierarchical CPU topology layout for MSM8916 Ulf Hansson
2019-11-11 11:00 ` [PATCH v2 00/13] cpuidle: psci: Support hierarchical CPU arrangement Ulf Hansson
2019-11-11 14:31 ` Sudeep Holla
2019-11-22 8:14 ` Ulf Hansson
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