We have PSCI SYSTEM_OFF and SYSTEM_RESET function call emulation available when running as Guest using KVM ARM64.
This patch implements system reboot and poweroff using PSCI SYSTEM_OFF and SYSTEM_RESET.
Signed-off-by: Anup Patel anup.patel@linaro.org Signed-off-by: Pranavkumar Sawargaonkar pranavkumar@linaro.org --- arch/arm64/kernel/psci.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+)
diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c index 14f73c4..a157e4d 100644 --- a/arch/arm64/kernel/psci.c +++ b/arch/arm64/kernel/psci.c @@ -17,9 +17,11 @@
#include <linux/init.h> #include <linux/of.h> +#include <linux/pm.h>
#include <asm/compiler.h> #include <asm/errno.h> +#include <asm/system_misc.h> #include <asm/psci.h>
struct psci_operations psci_ops; @@ -31,6 +33,8 @@ enum psci_function { PSCI_FN_CPU_ON, PSCI_FN_CPU_OFF, PSCI_FN_MIGRATE, + PSCI_FN_SYSTEM_OFF, + PSCI_FN_SYSTEM_RESET, PSCI_FN_MAX, };
@@ -151,6 +155,28 @@ static int psci_migrate(unsigned long cpuid) return psci_to_linux_errno(err); }
+static void psci_power_off(void) +{ + int err; + u32 fn; + + fn = psci_function_id[PSCI_FN_SYSTEM_OFF]; + err = invoke_psci_fn(fn, 0, 0, 0); + if (err) + pr_warning("%s: failed\n", __func__); +} + +static void psci_restart(enum reboot_mode reboot_mode, const char *cmd) +{ + int err; + u32 fn; + + fn = psci_function_id[PSCI_FN_SYSTEM_RESET]; + err = invoke_psci_fn(fn, 0, 0, 0); + if (err) + pr_warning("%s: failed\n", __func__); +} + static const struct of_device_id psci_of_match[] __initconst = { { .compatible = "arm,psci", }, {}, @@ -205,6 +231,16 @@ int __init psci_init(void) psci_ops.migrate = psci_migrate; }
+ if (!of_property_read_u32(np, "system_off", &id)) { + psci_function_id[PSCI_FN_SYSTEM_OFF] = id; + pm_power_off = psci_power_off; + } + + if (!of_property_read_u32(np, "system_reset", &id)) { + psci_function_id[PSCI_FN_SYSTEM_RESET] = id; + arm_pm_restart = psci_restart; + } + out_put_node: of_node_put(np); return err;