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SubjectRe: [PATCH v10 17/27] drivers: firmware: psci: Prepare to support PM domains
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On 29/11/2018 18:46, Ulf Hansson wrote:
> Following changes are about to implement support for PM domains to PSCI.
> Those changes are mainly going to be implemented in a new separate file,
> hence a couple of the internal PSCI functions needs to be shared to be
> accessible. So, let's do that via adding new PSCI header file.
>
> Moreover, the changes deploying support for PM domains, needs to be able to
> switch the PSCI FW into the OS initiated mode. For that reason, let's add a
> new function that deals with this and share it via the new PSCI header
> file.
>
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
>
> Changes in v10:
> - New patch. Re-places the earlier patch: "drivers: firmware: psci:
> Share a few internal PSCI functions".
>
> ---
> drivers/firmware/psci/psci.c | 28 +++++++++++++++++++++-------
> drivers/firmware/psci/psci.h | 14 ++++++++++++++
> 2 files changed, 35 insertions(+), 7 deletions(-)
> create mode 100644 drivers/firmware/psci/psci.h
>
> diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
> index 8dbcdecc2ae4..623591b541a4 100644
> --- a/drivers/firmware/psci/psci.c
> +++ b/drivers/firmware/psci/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.
> @@ -90,23 +92,35 @@ 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);
> }
>
> +bool psci_set_osi_mode(void)
> +{
> + int ret;
> +
> + ret = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE,
> + PSCI_1_0_SUSPEND_MODE_OSI, 0, 0);
> + if (ret)
> + pr_warn("failed to enable OSI mode: %d\n", ret);
> +
> + return !ret;
> +}

Please keep the convention with the error code (0 => success)

In the next patch it can be called:

if (psci_has_osi_support())
osi_mode_enabled = psci_set_osi_mode() ? false : true;

> +
> static inline bool psci_has_ext_power_state(void)
> {
> return psci_cpu_suspend_feature &
> PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;
> }
>
> -static inline bool psci_has_osi_support(void)
> +bool psci_has_osi_support(void)
> {
> return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED;
> }
> @@ -285,10 +299,7 @@ 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 +316,9 @@ static int psci_dt_parse_state_node(struct device_node *np, u32 *state)
> return 0;
> }
>
> +#ifdef CONFIG_CPU_IDLE

It would be nicer if you can remove the CONFIG_CPU_IDLE by replacing it
with a specific one (eg. CONFIG_PSCI_IDLE) and make it depend on
CONFIG_CPU_IDLE, so the config options stay contained in their
respective subsystems directory.

> +static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state);
> +
> static int psci_dt_cpu_init_idle(struct cpuidle_driver *drv,
> struct device_node *cpu_node, int cpu)
> {
> diff --git a/drivers/firmware/psci/psci.h b/drivers/firmware/psci/psci.h
> new file mode 100644
> index 000000000000..7d9d38fd57e1
> --- /dev/null
> +++ b/drivers/firmware/psci/psci.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#ifndef __PSCI_H
> +#define __PSCI_H
> +
> +struct device_node;
> +
> +bool psci_set_osi_mode(void);
> +u32 psci_get_domain_state(void);
> +void psci_set_domain_state(u32 state);
> +bool psci_has_osi_support(void);
> +int psci_dt_parse_state_node(struct device_node *np, u32 *state);
> +
> +#endif /* __PSCI_H */


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