psci: Split functions to v0.1 and v0.2+ variants

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@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20201202184122.26046-5-dbrazdil@google.com

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;