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;
117 	arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);  in __invoke_psci_fn_hvc()
127 	arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);  in __invoke_psci_fn_smc()
135 		return 0;  in psci_to_linux_errno()
137 		return -EOPNOTSUPP;  in psci_to_linux_errno()
140 		return -EINVAL;  in psci_to_linux_errno()
142 		return -EPERM;  in psci_to_linux_errno()
145 	return -EINVAL;  in psci_to_linux_errno()
150 	return PSCI_VERSION(0, 1);  in psci_0_1_get_version()
155 	return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);  in psci_0_2_get_version()
166 	err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0);  in psci_set_osi_mode()
167 	if (err < 0)  in psci_set_osi_mode()
176 	err = invoke_psci_fn(fn, state, entry_point, 0);  in __psci_cpu_suspend()
188 	return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),  in psci_0_2_cpu_suspend()
196 	err = invoke_psci_fn(fn, state, 0, 0);  in __psci_cpu_off()
214 	err = invoke_psci_fn(fn, cpuid, entry_point, 0);  in __psci_cpu_on()
225 	return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point);  in psci_0_2_cpu_on()
232 	err = invoke_psci_fn(fn, cpuid, 0, 0);  in __psci_migrate()
243 	return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid);  in psci_0_2_migrate()
249 	return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),  in psci_affinity_info()
250 			      target_affinity, lowest_affinity_level, 0);  in psci_affinity_info()
255 	return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);  in psci_migrate_info_type()
260 	return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),  in psci_migrate_info_up_cpu()
261 			      0, 0, 0);  in psci_migrate_info_up_cpu()
274 		WARN(1, "Unexpected PSCI conduit %d\n", conduit);  in set_conduit()
288 		return -ENXIO;  in get_set_conduit_method()
297 		return -EINVAL;  in get_set_conduit_method()
299 	return 0;  in get_set_conduit_method()
308 		 * reset_type[31] = 0 (architectural)  in psci_sys_reset()
309 		 * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)  in psci_sys_reset()
310 		 * cookie = 0 (ignored by the implementation)  in psci_sys_reset()
312 		invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);  in psci_sys_reset()
314 		invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);  in psci_sys_reset()
327 	invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);  in psci_sys_poweroff()
333 			      psci_func_id, 0, 0);  in psci_features()
348 	PSCI_ID_NATIVE(0_2, MIGRATE),
349 	PSCI_ID(0_2, MIGRATE_INFO_TYPE),
350 	PSCI_ID_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
375 		return 0;  in psci_debugfs_read()
379 		ver = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);  in psci_debugfs_read()
384 		seq_puts(s, "SMC Calling Convention v1.0 is assumed\n");  in psci_debugfs_read()
387 	feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));  in psci_debugfs_read()
388 	if (feature < 0) {  in psci_debugfs_read()
392 			   (feature & BIT(0)) ? "" : "not ");  in psci_debugfs_read()
405 		seq_printf(s, "Trusted OS resident on physical CPU 0x%lx (#%d)\n",  in psci_debugfs_read()
414 	for (i = 0; i < ARRAY_SIZE(psci_fn_ids); i++) {  in psci_debugfs_read()
418 		if (feature < 0)  in psci_debugfs_read()
425 	return 0;  in psci_debugfs_read()
443 	return PTR_ERR_OR_ZERO(debugfs_create_file("psci", 0444, NULL, NULL,  in psci_debugfs_init()
466 		ret = psci_ops.cpu_suspend(state, 0);  in psci_cpu_suspend_enter()
481 			      pa_cpu_resume, 0, 0);  in psci_system_suspend()
486 	return cpu_suspend(0, psci_system_suspend);  in psci_system_suspend_enter()
519 	int feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));  in psci_init_cpu_suspend()
532 	int type, cpu = -1;  in psci_init_migrate()
554 		pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",  in psci_init_migrate()
560 	resident_cpu = cpu >= 0 ? cpu : -1;  in psci_init_migrate()
562 	pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);  in psci_init_migrate()
574 		ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);  in psci_init_smccc()
582 	 * Conveniently, the SMCCC and PSCI versions are encoded the  in psci_init_smccc()
592 	pr_info("Using standard PSCI v0.2 function IDs\n");  in psci_0_2_set_functions()
610  * Probe function for PSCI firmware versions >= 0.2
620 	if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {  in psci_probe()
621 		pr_err("Conflicting PSCI version detected.\n");  in psci_probe()
622 		return -EINVAL;  in psci_probe()
637 	return 0;  in psci_probe()
643  * PSCI init function for PSCI versions >=0.2
645  * Probe based on PSCI PSCI_VERSION function
656 	 * Starting with v0.2, the PSCI specification introduced a call  in psci_0_2_init()
658 	 * that PSCI function IDs and version specific initialization  in psci_0_2_init()
666  * PSCI < v0.2 get PSCI Function IDs via DT.
677 	pr_info("Using PSCI v0.1 Function IDs from DT\n");  in psci_0_1_init()
701 	return 0;  in psci_0_1_init()
719 	return 0;  in psci_1_0_init()
723 	{ .compatible = "arm,psci",	.data = psci_0_1_init},
724 	{ .compatible = "arm,psci-0.2",	.data = psci_0_2_init},
725 	{ .compatible = "arm,psci-1.0",	.data = psci_1_0_init},
739 		return -ENODEV;  in psci_dt_init()
741 	init_fn = (psci_initcall_t)matched_np->data;  in psci_dt_init()
750  * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
757 		return -EOPNOTSUPP;  in psci_acpi_init()