1 // SPDX-License-Identifier: GPL-2.0-only
7 #define pr_fmt(fmt) "psci: " fmt
10 #include <linux/arm-smccc.h>
18 #include <linux/psci.h>
23 #include <uapi/linux/psci.h>
33  * While a 64-bit OS can make calls with SMC32 calling conventions, for some
34  * calls it is necessary to use SMC64 to pass or return 64-bit values.
36  * (native-width) function ID.
47  * a Trusted OS even if it claims to be capable of migration -- doing so will
50 static int resident_cpu = -1;
139 		return -EOPNOTSUPP;  in psci_to_linux_errno()
142 		return -EINVAL;  in psci_to_linux_errno()
144 		return -EPERM;  in psci_to_linux_errno()
147 	return -EINVAL;  in psci_to_linux_errno()
152 	return PSCI_VERSION(0, 1);  in psci_0_1_get_version()
280 		WARN(1, "Unexpected PSCI conduit %d\n", conduit);  in set_conduit()
294 		return -ENXIO;  in get_set_conduit_method()
303 		return -EINVAL;  in get_set_conduit_method()
318 		invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);  in psci_sys_reset()
357 	PSCI_ID(1_0, CPU_FREEZE),
358 	PSCI_ID_NATIVE(1_0, CPU_DEFAULT_SUSPEND),
359 	PSCI_ID_NATIVE(1_0, NODE_HW_STATE),
360 	PSCI_ID_NATIVE(1_0, SYSTEM_SUSPEND),
361 	PSCI_ID(1_0, SET_SUSPEND_MODE),
362 	PSCI_ID_NATIVE(1_0, STAT_RESIDENCY),
363 	PSCI_ID_NATIVE(1_0, STAT_COUNT),
364 	PSCI_ID_NATIVE(1_1, SYSTEM_RESET2),
365 	PSCI_ID(1_1, MEM_PROTECT),
366 	PSCI_ID_NATIVE(1_1, MEM_PROTECT_CHECK_RANGE),
380 	if (PSCI_VERSION_MAJOR(ver) < 1)  in psci_debugfs_read()
400 			   (feature & BIT(1)) ? "Extended" : "Original");  in psci_debugfs_read()
452 	return PTR_ERR_OR_ZERO(debugfs_create_file("psci", 0444, NULL, NULL,  in psci_debugfs_init()
503 	err = invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),  in psci_system_suspend()
522 	ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2));  in psci_init_system_reset2()
535 	ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));  in psci_init_system_suspend()
556 	int type, cpu = -1;  in psci_init_migrate()
584 	resident_cpu = cpu >= 0 ? cpu : -1;  in psci_init_migrate()
606 	 * Conveniently, the SMCCC and PSCI versions are encoded the  in psci_init_smccc()
616 	pr_info("Using standard PSCI v0.2 function IDs\n");  in psci_0_2_set_functions()
634  * Probe function for PSCI firmware versions >= 0.2
645 		pr_err("Conflicting PSCI version detected.\n");  in psci_probe()
646 		return -EINVAL;  in psci_probe()
653 	if (PSCI_VERSION_MAJOR(ver) >= 1) {  in psci_probe()
667  * PSCI init function for PSCI versions >=0.2
669  * Probe based on PSCI PSCI_VERSION function
680 	 * Starting with v0.2, the PSCI specification introduced a call  in psci_0_2_init()
682 	 * that PSCI function IDs and version specific initialization  in psci_0_2_init()
690  * PSCI < v0.2 get PSCI Function IDs via DT.
701 	pr_info("Using PSCI v0.1 Function IDs from DT\n");  in psci_0_1_init()
747 	{ .compatible = "arm,psci",	.data = psci_0_1_init},
748 	{ .compatible = "arm,psci-0.2",	.data = psci_0_2_init},
749 	{ .compatible = "arm,psci-1.0",	.data = psci_1_0_init},
763 		return -ENODEV;  in psci_dt_init()
765 	init_fn = (psci_initcall_t)matched_np->data;  in psci_dt_init()
774  * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
781 		return -EOPNOTSUPP;  in psci_acpi_init()