linux-kernel - Re: [PATCH v6 18/25] drivers: firmware: psci: Share a few internal PSCI functions

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Date:   Wed, 14 Mar 2018 17:30:43 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        linux-pm@...r.kernel.org, Kevin Hilman <khilman@...nel.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Lina Iyer <lina.iyer@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Juri Lelli <juri.lelli@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 18/25] drivers: firmware: psci: Share a few internal
 PSCI functions

On Wed, Mar 14, 2018 at 05:58:28PM +0100, Ulf Hansson wrote:
> Following changes needs to be able to call psci_get|set_domain_state() and
> psci_dt_parse_state_node(), but from a separate file. Let's make that
> possible by sharing them via a new internal PSCI header file.
> 
> Cc: Lina Iyer <ilina@...eaurora.org>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
>  drivers/firmware/psci.c | 14 ++++++++------
>  drivers/firmware/psci.h | 13 +++++++++++++
>  2 files changed, 21 insertions(+), 6 deletions(-)
>  create mode 100644 drivers/firmware/psci.h

To mimimize the clutter in drivers/firmware/, it might be better to
move this into a drivers/firmware/psci/ directory, which would also
simplify the MAINTAINERS modification.

Thanks,
Mark.

> 
> diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
> index 40b2b89..463f78c 100644
> --- a/drivers/firmware/psci.c
> +++ b/drivers/firmware/psci.c
> @@ -34,6 +34,8 @@
>  #include <asm/smp_plat.h>
>  #include <asm/suspend.h>
>  
> +#include "psci.h"
> +
>  /*
>   * While a 64-bit OS can make calls with SMC32 calling conventions, for some
>   * calls it is necessary to use SMC64 to pass or return 64-bit values.
> @@ -90,12 +92,12 @@ static u32 psci_function_id[PSCI_FN_MAX];
>  static DEFINE_PER_CPU(u32, domain_state);
>  static u32 psci_cpu_suspend_feature;
>  
> -static inline u32 psci_get_domain_state(void)
> +u32 psci_get_domain_state(void)
>  {
>  	return this_cpu_read(domain_state);
>  }
>  
> -static inline void psci_set_domain_state(u32 state)
> +void psci_set_domain_state(u32 state)
>  {
>  	this_cpu_write(domain_state, state);
>  }
> @@ -285,10 +287,7 @@ static int __init psci_features(u32 psci_func_id)
>  			      psci_func_id, 0, 0);
>  }
>  
> -#ifdef CONFIG_CPU_IDLE
> -static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state);
> -
> -static int psci_dt_parse_state_node(struct device_node *np, u32 *state)
> +int psci_dt_parse_state_node(struct device_node *np, u32 *state)
>  {
>  	int err = of_property_read_u32(np, "arm,psci-suspend-param", state);
>  
> @@ -305,6 +304,9 @@ static int psci_dt_parse_state_node(struct device_node *np, u32 *state)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_CPU_IDLE
> +static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state);
> +
>  static int psci_dt_cpu_init_idle(struct device_node *cpu_node, int cpu)
>  {
>  	int i, ret = 0, count = 0;
> diff --git a/drivers/firmware/psci.h b/drivers/firmware/psci.h
> new file mode 100644
> index 0000000..a2b4be5
> --- /dev/null
> +++ b/drivers/firmware/psci.h
> @@ -0,0 +1,13 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#ifndef __PSCI_H
> +#define __PSCI_H
> +
> +struct device_node;
> +
> +u32 psci_get_domain_state(void);
> +void psci_set_domain_state(u32 state);
> +
> +int psci_dt_parse_state_node(struct device_node *np, u32 *state);
> +
> +#endif /* __PSCI_H */
> -- 
> 2.7.4
> 
> --
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