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arm: psci: Add API to check for support of specific PSCI function

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Add an API to check if a specific PSCI function is supported or not.
This is based on the psci_features() function present in Linux kernel
(drivers/firmware/psci/psci.c).

Reviewed-by: Casey Connolly <casey.connolly@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Signed-off-by: Varadarajan Narayanan <varadarajan.narayanan@oss.qualcomm.com>
Link: https://patch.msgid.link/20260121063920.1500293-2-varadarajan.narayanan@oss.qualcomm.com
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>
This commit is contained in:
Varadarajan Narayanan
2026-01-21 12:09:16 +05:30
committed by Casey Connolly
parent c3d00f1827
commit f9e3f5f75c
2 changed files with 16 additions and 0 deletions
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15
arch/arm/cpu/armv8/fwcall.c
View File

@@ -129,3 +129,18 @@ void __noreturn psci_system_off(void)
while (1)
;
}
int psci_features(u32 psci_func_id)
{
struct pt_regs regs;
regs.regs[0] = ARM_PSCI_1_0_FN_PSCI_FEATURES;
regs.regs[1] = psci_func_id;
if (use_smc_for_psci)
smc_call(&regs);
else
hvc_call(&regs);
return regs.regs[0];
}

1
arch/arm/include/asm/system.h
View File

@@ -342,6 +342,7 @@ void smc_call(struct pt_regs *args);
void __noreturn psci_system_reset(void);
void __noreturn psci_system_reset2(u32 reset_level, u32 cookie);
void __noreturn psci_system_off(void);
int psci_features(u32 psci_func_id);
#ifdef CONFIG_ARMV8_PSCI
extern char __secure_start[];