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>
31  * While a 64-bit OS can make calls with SMC32 calling conventions, for some
32  * calls it is necessary to use SMC64 to pass or return 64-bit values.
34  * (native-width) function ID.
45  * a Trusted OS even if it claims to be capable of migration -- doing so will
48 static int resident_cpu = -1;
121 	arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);  in __invoke_psci_fn_hvc()
131 	arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);  in __invoke_psci_fn_smc()
139 		return 0;  in psci_to_linux_errno()
141 		return -EOPNOTSUPP;  in psci_to_linux_errno()
144 		return -EINVAL;  in psci_to_linux_errno()
146 		return -EPERM;  in psci_to_linux_errno()
149 	return -EINVAL;  in psci_to_linux_errno()
154 	return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);  in psci_get_version()
163 	err = invoke_psci_fn(fn, state, entry_point, 0);  in psci_cpu_suspend()
173 	err = invoke_psci_fn(fn, state, 0, 0);  in psci_cpu_off()
183 	err = invoke_psci_fn(fn, cpuid, entry_point, 0);  in psci_cpu_on()
193 	err = invoke_psci_fn(fn, cpuid, 0, 0);  in psci_migrate()
200 	return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),  in psci_affinity_info()
201 			      target_affinity, lowest_affinity_level, 0);  in psci_affinity_info()
206 	return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);  in psci_migrate_info_type()
211 	return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),  in psci_migrate_info_up_cpu()
212 			      0, 0, 0);  in psci_migrate_info_up_cpu()
225 		WARN(1, "Unexpected PSCI conduit %d\n", conduit);  in set_conduit()
239 		return -ENXIO;  in get_set_conduit_method()
248 		return -EINVAL;  in get_set_conduit_method()
250 	return 0;  in get_set_conduit_method()
258 		 * reset_type[31] = 0 (architectural)  in psci_sys_reset()
259 		 * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)  in psci_sys_reset()
260 		 * cookie = 0 (ignored by the implementation)  in psci_sys_reset()
262 		invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);  in psci_sys_reset()
264 		invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);  in psci_sys_reset()
270 	invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);  in psci_sys_poweroff()
276 			      psci_func_id, 0, 0);  in psci_features()
292 		ret = psci_ops.cpu_suspend(state, 0);  in psci_cpu_suspend_enter()
303 			      __pa_symbol(cpu_resume), 0, 0);  in psci_system_suspend()
308 	return cpu_suspend(0, psci_system_suspend);  in psci_system_suspend_enter()
354 	int type, cpu = -1;  in psci_init_migrate()
376 		pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",  in psci_init_migrate()
382 	resident_cpu = cpu >= 0 ? cpu : -1;  in psci_init_migrate()
384 	pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);  in psci_init_migrate()
396 		ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);  in psci_init_smccc()
404 	 * Conveniently, the SMCCC and PSCI versions are encoded the  in psci_init_smccc()
414 	pr_info("Using standard PSCI v0.2 function IDs\n");  in psci_0_2_set_functions()
418 					PSCI_FN_NATIVE(0_2, CPU_SUSPEND);  in psci_0_2_set_functions()
424 	psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON);  in psci_0_2_set_functions()
427 	psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE);  in psci_0_2_set_functions()
440  * Probe function for PSCI firmware versions >= 0.2
450 	if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {  in psci_probe()
451 		pr_err("Conflicting PSCI version detected.\n");  in psci_probe()
452 		return -EINVAL;  in psci_probe()
466 	return 0;  in psci_probe()
472  * PSCI init function for PSCI versions >=0.2
474  * Probe based on PSCI PSCI_VERSION function
485 	 * Starting with v0.2, the PSCI specification introduced a call  in psci_0_2_init()
487 	 * that PSCI function IDs and version specific initialization  in psci_0_2_init()
495  * PSCI < v0.2 get PSCI Function IDs via DT.
506 	pr_info("Using PSCI v0.1 Function IDs from DT\n");  in psci_0_1_init()
528 	return 0;  in psci_0_1_init()
542 	return 0;  in psci_1_0_init()
546 	{ .compatible = "arm,psci",	.data = psci_0_1_init},
547 	{ .compatible = "arm,psci-0.2",	.data = psci_0_2_init},
548 	{ .compatible = "arm,psci-1.0",	.data = psci_1_0_init},
562 		return -ENODEV;  in psci_dt_init()
564 	init_fn = (psci_initcall_t)matched_np->data;  in psci_dt_init()
573  * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
580 		return -EOPNOTSUPP;  in psci_acpi_init()