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Message-ID: <20201203104246.GA96754@C02TD0UTHF1T.local>
Date: Thu, 3 Dec 2020 10:42:46 +0000
From: Mark Rutland <mark.rutland@....com>
To: David Brazdil <dbrazdil@...gle.com>
Cc: kvmarm@...ts.cs.columbia.edu, Jonathan Corbet <corbet@....net>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
James Morse <james.morse@....com>,
Julien Thierry <julien.thierry.kdev@...il.com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
Christoph Lameter <cl@...ux.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Sudeep Holla <sudeep.holla@....com>, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
kernel-team@...roid.com
Subject: Re: [PATCH v4 04/26] psci: Split functions to v0.1 and v0.2+ variants
On Wed, Dec 02, 2020 at 06:41:00PM +0000, David Brazdil wrote:
> Refactor implementation of v0.1+ functions (CPU_SUSPEND, CPU_OFF,
> CPU_ON, MIGRATE) to have two functions psci_0_1_foo / psci_0_2_foo that
> select the function ID and call a common helper __psci_foo.
>
> This is a small cleanup so that the function ID array is only used for
> v0.1 configurations.
>
> Signed-off-by: David Brazdil <dbrazdil@...gle.com>
Acked-by: Mark Rutland <mark.rutland@....com>
Mark.
> ---
> drivers/firmware/psci/psci.c | 94 +++++++++++++++++++++++-------------
> 1 file changed, 60 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
> index ace5b9ac676c..13b9ed71b446 100644
> --- a/drivers/firmware/psci/psci.c
> +++ b/drivers/firmware/psci/psci.c
> @@ -168,46 +168,80 @@ int psci_set_osi_mode(bool enable)
> return psci_to_linux_errno(err);
> }
>
> -static int psci_cpu_suspend(u32 state, unsigned long entry_point)
> +static int __psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
> {
> int err;
> - u32 fn;
>
> - fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
> err = invoke_psci_fn(fn, state, entry_point, 0);
> return psci_to_linux_errno(err);
> }
>
> -static int psci_cpu_off(u32 state)
> +static int psci_0_1_cpu_suspend(u32 state, unsigned long entry_point)
> +{
> + return __psci_cpu_suspend(psci_function_id[PSCI_FN_CPU_SUSPEND],
> + state, entry_point);
> +}
> +
> +static int psci_0_2_cpu_suspend(u32 state, unsigned long entry_point)
> +{
> + return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),
> + state, entry_point);
> +}
> +
> +static int __psci_cpu_off(u32 fn, u32 state)
> {
> int err;
> - u32 fn;
>
> - fn = psci_function_id[PSCI_FN_CPU_OFF];
> err = invoke_psci_fn(fn, state, 0, 0);
> return psci_to_linux_errno(err);
> }
>
> -static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
> +static int psci_0_1_cpu_off(u32 state)
> +{
> + return __psci_cpu_off(psci_function_id[PSCI_FN_CPU_OFF], state);
> +}
> +
> +static int psci_0_2_cpu_off(u32 state)
> +{
> + return __psci_cpu_off(PSCI_0_2_FN_CPU_OFF, state);
> +}
> +
> +static int __psci_cpu_on(u32 fn, unsigned long cpuid, unsigned long entry_point)
> {
> int err;
> - u32 fn;
>
> - fn = psci_function_id[PSCI_FN_CPU_ON];
> err = invoke_psci_fn(fn, cpuid, entry_point, 0);
> return psci_to_linux_errno(err);
> }
>
> -static int psci_migrate(unsigned long cpuid)
> +static int psci_0_1_cpu_on(unsigned long cpuid, unsigned long entry_point)
> +{
> + return __psci_cpu_on(psci_function_id[PSCI_FN_CPU_ON], cpuid, entry_point);
> +}
> +
> +static int psci_0_2_cpu_on(unsigned long cpuid, unsigned long entry_point)
> +{
> + return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point);
> +}
> +
> +static int __psci_migrate(u32 fn, unsigned long cpuid)
> {
> int err;
> - u32 fn;
>
> - fn = psci_function_id[PSCI_FN_MIGRATE];
> err = invoke_psci_fn(fn, cpuid, 0, 0);
> return psci_to_linux_errno(err);
> }
>
> +static int psci_0_1_migrate(unsigned long cpuid)
> +{
> + return __psci_migrate(psci_function_id[PSCI_FN_MIGRATE], cpuid);
> +}
> +
> +static int psci_0_2_migrate(unsigned long cpuid)
> +{
> + return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid);
> +}
> +
> static int psci_affinity_info(unsigned long target_affinity,
> unsigned long lowest_affinity_level)
> {
> @@ -352,7 +386,7 @@ static void __init psci_init_system_suspend(void)
>
> static void __init psci_init_cpu_suspend(void)
> {
> - int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]);
> + int feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));
>
> if (feature != PSCI_RET_NOT_SUPPORTED)
> psci_cpu_suspend_feature = feature;
> @@ -426,24 +460,16 @@ static void __init psci_init_smccc(void)
> static void __init psci_0_2_set_functions(void)
> {
> pr_info("Using standard PSCI v0.2 function IDs\n");
> - psci_ops.get_version = psci_0_2_get_version;
> -
> - psci_function_id[PSCI_FN_CPU_SUSPEND] =
> - PSCI_FN_NATIVE(0_2, CPU_SUSPEND);
> - psci_ops.cpu_suspend = psci_cpu_suspend;
> -
> - psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
> - psci_ops.cpu_off = psci_cpu_off;
> -
> - psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON);
> - psci_ops.cpu_on = psci_cpu_on;
>
> - psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE);
> - psci_ops.migrate = psci_migrate;
> -
> - psci_ops.affinity_info = psci_affinity_info;
> -
> - psci_ops.migrate_info_type = psci_migrate_info_type;
> + psci_ops = (struct psci_operations){
> + .get_version = psci_0_2_get_version,
> + .cpu_suspend = psci_0_2_cpu_suspend,
> + .cpu_off = psci_0_2_cpu_off,
> + .cpu_on = psci_0_2_cpu_on,
> + .migrate = psci_0_2_migrate,
> + .affinity_info = psci_affinity_info,
> + .migrate_info_type = psci_migrate_info_type,
> + };
>
> arm_pm_restart = psci_sys_reset;
>
> @@ -523,22 +549,22 @@ static int __init psci_0_1_init(struct device_node *np)
>
> if (!of_property_read_u32(np, "cpu_suspend", &id)) {
> psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
> - psci_ops.cpu_suspend = psci_cpu_suspend;
> + psci_ops.cpu_suspend = psci_0_1_cpu_suspend;
> }
>
> if (!of_property_read_u32(np, "cpu_off", &id)) {
> psci_function_id[PSCI_FN_CPU_OFF] = id;
> - psci_ops.cpu_off = psci_cpu_off;
> + psci_ops.cpu_off = psci_0_1_cpu_off;
> }
>
> if (!of_property_read_u32(np, "cpu_on", &id)) {
> psci_function_id[PSCI_FN_CPU_ON] = id;
> - psci_ops.cpu_on = psci_cpu_on;
> + psci_ops.cpu_on = psci_0_1_cpu_on;
> }
>
> if (!of_property_read_u32(np, "migrate", &id)) {
> psci_function_id[PSCI_FN_MIGRATE] = id;
> - psci_ops.migrate = psci_migrate;
> + psci_ops.migrate = psci_0_1_migrate;
> }
>
> return 0;
> --
> 2.29.2.454.gaff20da3a2-goog
>
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