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firmware/psci: Expose PSCI conduit

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In order to call into the firmware to apply workarounds, it is
useful to find out whether we're using HVC or SMC. Let's expose
this through the psci_ops.

Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Marc Zyngier 2018-02-06 17:56:16 +00:00 committed by Catalin Marinas
parent f72af90c37
commit 09a8d6d484
2 changed files with 30 additions and 5 deletions
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28
drivers/firmware/psci.c
View file

@ -59,7 +59,9 @@ bool psci_tos_resident_on(int cpu)
return cpu == resident_cpu;
}
struct psci_operations psci_ops;
struct psci_operations psci_ops = {
.conduit = PSCI_CONDUIT_NONE,
};
typedef unsigned long (psci_fn)(unsigned long, unsigned long,
unsigned long, unsigned long);
@ -210,6 +212,22 @@ static unsigned long psci_migrate_info_up_cpu(void)
0, 0, 0);
}
static void set_conduit(enum psci_conduit conduit)
{
switch (conduit) {
case PSCI_CONDUIT_HVC:
invoke_psci_fn = __invoke_psci_fn_hvc;
break;
case PSCI_CONDUIT_SMC:
invoke_psci_fn = __invoke_psci_fn_smc;
break;
default:
WARN(1, "Unexpected PSCI conduit %d\n", conduit);
}
psci_ops.conduit = conduit;
}
static int get_set_conduit_method(struct device_node *np)
{
const char *method;
@ -222,9 +240,9 @@ static int get_set_conduit_method(struct device_node *np)
}
if (!strcmp("hvc", method)) {
invoke_psci_fn = __invoke_psci_fn_hvc;
set_conduit(PSCI_CONDUIT_HVC);
} else if (!strcmp("smc", method)) {
invoke_psci_fn = __invoke_psci_fn_smc;
set_conduit(PSCI_CONDUIT_SMC);
} else {
pr_warn("invalid \"method\" property: %s\n", method);
return -EINVAL;
@ -654,9 +672,9 @@ int __init psci_acpi_init(void)
pr_info("probing for conduit method from ACPI.\n");
if (acpi_psci_use_hvc())
invoke_psci_fn = __invoke_psci_fn_hvc;
set_conduit(PSCI_CONDUIT_HVC);
else
invoke_psci_fn = __invoke_psci_fn_smc;
set_conduit(PSCI_CONDUIT_SMC);
return psci_probe();
}

7
include/linux/psci.h
View file

@ -25,6 +25,12 @@ bool psci_tos_resident_on(int cpu);
int psci_cpu_init_idle(unsigned int cpu);
int psci_cpu_suspend_enter(unsigned long index);
enum psci_conduit {
PSCI_CONDUIT_NONE,
PSCI_CONDUIT_SMC,
PSCI_CONDUIT_HVC,
};
struct psci_operations {
u32 (*get_version)(void);
int (*cpu_suspend)(u32 state, unsigned long entry_point);
@ -34,6 +40,7 @@ struct psci_operations {
int (*affinity_info)(unsigned long target_affinity,
unsigned long lowest_affinity_level);
int (*migrate_info_type)(void);
enum psci_conduit conduit;
};
extern struct psci_operations psci_ops;