1 // SPDX-License-Identifier: GPL-2.0-only
31 static int tos_resident_cpu = -1;
42  * "enable-method" property of each CPU in the DT, but given that there is no
43  * arch-specific way to check this, we assume that the DT is sensible.
47 	int migrate_type = -1;  in psci_ops_check()
52 		return -EOPNOTSUPP;  in psci_ops_check()
66 		if (tos_resident_cpu == -1)  in psci_ops_check()
85 	/* Try to power down all CPUs in the mask. */  in down_and_up_cpus()
94 			if (ret != -EBUSY) {  in down_and_up_cpus()
96 				       "to power down last online CPU %d\n",  in down_and_up_cpus()
101 			if (ret != -EPERM) {  in down_and_up_cpus()
103 				       "to power down TOS resident CPU %d\n",  in down_and_up_cpus()
109 			       "to power down CPU %d\n", ret, cpu);  in down_and_up_cpus()
117 	/* Try to power up all the CPUs that have been offlined. */  in down_and_up_cpus()
123 			       "to power up CPU %d\n", ret, cpu);  in down_and_up_cpus()
156 		return -ENOMEM;  in alloc_init_cpu_groups()
162 		return -ENOMEM;  in alloc_init_cpu_groups()
174 			return -ENOMEM;  in alloc_init_cpu_groups()
188 	int i, nb_cpu_group, err = -ENOMEM;  in hotplug_tests()
206 	pr_info("Trying to turn off and on again all CPUs\n");  in hotplug_tests()
217 		page_buf[len - 1] = '\0';  in hotplug_tests()
218 		pr_info("Trying to turn off and on again group %d (CPUs %s)\n",  in hotplug_tests()
236 	struct cpuidle_state *state = &drv->states[index];  in suspend_cpu()
237 	bool broadcast = state->flags & CPUIDLE_FLAG_TIMER_STOP;  in suspend_cpu()
244 		 * The local timer will be shut down, we need to enter tick  in suspend_cpu()
251 			 * this CPU might be used to broadcast wakeups, which  in suspend_cpu()
253 			 * There is little the kernel can do to work around  in suspend_cpu()
254 			 * that, so enter WFI instead (idle state 0).  in suspend_cpu()
262 	ret = state->enter(dev, drv, index);  in suspend_cpu()
279 	/* No need for an actual callback, we just want to wake up the CPU. */  in suspend_test_thread()
282 	/* Wait for the main thread to give the start signal. */  in suspend_test_thread()
285 	/* Set maximum priority to preempt all other threads on this CPU. */  in suspend_test_thread()
291 	pr_info("CPU %d entering suspend cycles, states 1 through %d\n",  in suspend_test_thread()
292 		cpu, drv->state_count - 1);  in suspend_test_thread()
301 		for (index = 1; index < drv->state_count; ++index) {  in suspend_test_thread()
303 			struct cpuidle_state *state = &drv->states[index];  in suspend_test_thread()
306 			 * Set the timer to wake this CPU up in some time (which  in suspend_test_thread()
307 			 * should be largely sufficient for entering suspend).  in suspend_test_thread()
308 			 * If the local tick is disabled when entering suspend,  in suspend_test_thread()
309 			 * suspend_cpu() takes care of switching to a broadcast  in suspend_test_thread()
313 				  usecs_to_jiffies(state->target_residency));  in suspend_test_thread()
315 			/* IRQs must be disabled during suspend operations. */  in suspend_test_thread()
321 			 * We have woken up. Re-enable IRQs to handle any  in suspend_test_thread()
333 				pr_err("Failed to suspend CPU %d: error %d "  in suspend_test_thread()
342 	 * Disable the timer to make sure that the timer will not trigger  in suspend_test_thread()
352 		/* Needs to be set first to avoid missing a wakeup. */  in suspend_test_thread()
359 	pr_info("CPU %d suspend test results: success %d, shallow states %d, errors %d\n",  in suspend_test_thread()
376 		return -ENOMEM;  in suspend_tests()
379 	 * Stop cpuidle to prevent the idle tasks from entering a deep sleep  in suspend_tests()
380 	 * mode, as it might interfere with the suspend threads on other CPUs.  in suspend_tests()
381 	 * This does not prevent the suspend threads from using cpuidle (only  in suspend_tests()
382 	 * the idle tasks check this status). Take the idle lock so that  in suspend_tests()
383 	 * the cpuidle driver and device look-up can be carried out safely.  in suspend_tests()
403 			pr_err("Failed to create kthread on CPU %d\n", cpu);  in suspend_tests()
409 		err = -ENODEV;  in suspend_tests()
416 	 * Wake up the suspend threads. To avoid the main thread being preempted  in suspend_tests()
417 	 * before all the threads have been unparked, the suspend threads will  in suspend_tests()
471 	pr_info("Starting suspend tests (%d cycles per state)\n",  in psci_checker()
475 		pr_info("Suspend tests passed OK\n");  in psci_checker()
477 		pr_err("%d error(s) encountered in suspend tests\n", ret);  in psci_checker()
480 		case -ENOMEM:  in psci_checker()
483 		case -ENODEV:  in psci_checker()
484 			pr_warn("Could not start suspend tests on any CPU\n");  in psci_checker()