1 // SPDX-License-Identifier: GPL-2.0-only
7 #define pr_fmt(fmt) "psci: " fmt
10 #include <linux/arm-smccc.h>
17 #include <linux/psci.h>
22 #include <uapi/linux/psci.h>
32  * While a 64-bit OS can make calls with SMC32 calling conventions, for some
33  * calls it is necessary to use SMC64 to pass or return 64-bit values.
35  * (native-width) function ID.
46  * a Trusted OS even if it claims to be capable of migration -- doing so will
49 static int resident_cpu = -1;
116 	arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);  in __invoke_psci_fn_hvc()
126 	arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);  in __invoke_psci_fn_smc()
134 		return 0;  in psci_to_linux_errno()
136 		return -EOPNOTSUPP;  in psci_to_linux_errno()
139 		return -EINVAL;  in psci_to_linux_errno()
141 		return -EPERM;  in psci_to_linux_errno()
144 	return -EINVAL;  in psci_to_linux_errno()
149 	return PSCI_VERSION(0, 1);  in psci_0_1_get_version()
154 	return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);  in psci_0_2_get_version()
165 	err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0);  in psci_set_osi_mode()
173 	err = invoke_psci_fn(fn, state, entry_point, 0);  in __psci_cpu_suspend()
185 	return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),  in psci_0_2_cpu_suspend()
193 	err = invoke_psci_fn(fn, state, 0, 0);  in __psci_cpu_off()
211 	err = invoke_psci_fn(fn, cpuid, entry_point, 0);  in __psci_cpu_on()
222 	return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point);  in psci_0_2_cpu_on()
229 	err = invoke_psci_fn(fn, cpuid, 0, 0);  in __psci_migrate()
240 	return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid);  in psci_0_2_migrate()
246 	return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),  in psci_affinity_info()
247 			      target_affinity, lowest_affinity_level, 0);  in psci_affinity_info()
252 	return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);  in psci_migrate_info_type()
257 	return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),  in psci_migrate_info_up_cpu()
258 			      0, 0, 0);  in psci_migrate_info_up_cpu()
271 		WARN(1, "Unexpected PSCI conduit %d\n", conduit);  in set_conduit()
285 		return -ENXIO;  in get_set_conduit_method()
294 		return -EINVAL;  in get_set_conduit_method()
296 	return 0;  in get_set_conduit_method()
305 		 * reset_type[31] = 0 (architectural)  in psci_sys_reset()
306 		 * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)  in psci_sys_reset()
307 		 * cookie = 0 (ignored by the implementation)  in psci_sys_reset()
309 		invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);  in psci_sys_reset()
311 		invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);  in psci_sys_reset()
324 	invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);  in psci_sys_poweroff()
330 			      psci_func_id, 0, 0);  in psci_features()
350 		ret = psci_ops.cpu_suspend(state, 0);  in psci_cpu_suspend_enter()
365 			      pa_cpu_resume, 0, 0);  in psci_system_suspend()
370 	return cpu_suspend(0, psci_system_suspend);  in psci_system_suspend_enter()
403 	int feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));  in psci_init_cpu_suspend()
416 	int type, cpu = -1;  in psci_init_migrate()
438 		pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",  in psci_init_migrate()
444 	resident_cpu = cpu >= 0 ? cpu : -1;  in psci_init_migrate()
446 	pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);  in psci_init_migrate()
458 		ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);  in psci_init_smccc()
466 	 * Conveniently, the SMCCC and PSCI versions are encoded the  in psci_init_smccc()
476 	pr_info("Using standard PSCI v0.2 function IDs\n");  in psci_0_2_set_functions()
494  * Probe function for PSCI firmware versions >= 0.2
504 	if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {  in psci_probe()
505 		pr_err("Conflicting PSCI version detected.\n");  in psci_probe()
506 		return -EINVAL;  in psci_probe()
521 	return 0;  in psci_probe()
527  * PSCI init function for PSCI versions >=0.2
529  * Probe based on PSCI PSCI_VERSION function
540 	 * Starting with v0.2, the PSCI specification introduced a call  in psci_0_2_init()
542 	 * that PSCI function IDs and version specific initialization  in psci_0_2_init()
550  * PSCI < v0.2 get PSCI Function IDs via DT.
561 	pr_info("Using PSCI v0.1 Function IDs from DT\n");  in psci_0_1_init()
585 	return 0;  in psci_0_1_init()
603 	return 0;  in psci_1_0_init()
607 	{ .compatible = "arm,psci",	.data = psci_0_1_init},
608 	{ .compatible = "arm,psci-0.2",	.data = psci_0_2_init},
609 	{ .compatible = "arm,psci-1.0",	.data = psci_1_0_init},
623 		return -ENODEV;  in psci_dt_init()
625 	init_fn = (psci_initcall_t)matched_np->data;  in psci_dt_init()
634  * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
641 		return -EOPNOTSUPP;  in psci_acpi_init()