/* * We assume that PSCI operations are used if they are available. This is not * necessarily true on arm64, since the decision is based on the * "enable-method" property of each CPU in the DT, but given that there is no * arch-specific way to check this, we assume that the DT is sensible.
*/ staticint psci_ops_check(void)
{ int migrate_type = -1; int cpu;
if (psci_ops.migrate_info_type)
migrate_type = psci_ops.migrate_info_type();
if (migrate_type == PSCI_0_2_TOS_UP_MIGRATE ||
migrate_type == PSCI_0_2_TOS_UP_NO_MIGRATE) { /* There is a UP Trusted OS, find on which core it resides. */
for_each_online_cpu(cpu) if (psci_tos_resident_on(cpu)) {
tos_resident_cpu = cpu; break;
} if (tos_resident_cpu == -1)
pr_warn("UP Trusted OS resides on no online CPU\n");
}
return 0;
}
/* * offlined_cpus is a temporary array but passing it as an argument avoids * multiple allocations.
*/ staticunsignedint down_and_up_cpus(conststruct cpumask *cpus, struct cpumask *offlined_cpus)
{ int cpu; int err = 0;
cpumask_clear(offlined_cpus);
/* Try to power down all CPUs in the mask. */
for_each_cpu(cpu, cpus) { int ret = remove_cpu(cpu);
/* * cpu_down() checks the number of online CPUs before the TOS * resident CPU.
*/ if (cpumask_weight(offlined_cpus) + 1 == nb_available_cpus) { if (ret != -EBUSY) {
pr_err("Unexpected return code %d while trying " "to power down last online CPU %d\n",
ret, cpu);
++err;
}
} elseif (cpu == tos_resident_cpu) { if (ret != -EPERM) {
pr_err("Unexpected return code %d while trying " "to power down TOS resident CPU %d\n",
ret, cpu);
++err;
}
} elseif (ret != 0) {
pr_err("Error occurred (%d) while trying " "to power down CPU %d\n", ret, cpu);
++err;
}
if (ret == 0)
cpumask_set_cpu(cpu, offlined_cpus);
}
/* Try to power up all the CPUs that have been offlined. */
for_each_cpu(cpu, offlined_cpus) { int ret = add_cpu(cpu);
if (ret != 0) {
pr_err("Error occurred (%d) while trying " "to power up CPU %d\n", ret, cpu);
++err;
} else {
cpumask_clear_cpu(cpu, offlined_cpus);
}
}
/* * Something went bad at some point and some CPUs could not be turned * back on.
*/
WARN_ON(!cpumask_empty(offlined_cpus) ||
num_online_cpus() != nb_available_cpus);
staticint hotplug_tests(void)
{ int i, nb_cpu_group, err = -ENOMEM;
cpumask_var_t offlined_cpus, *cpu_groups; char *page_buf;
if (!alloc_cpumask_var(&offlined_cpus, GFP_KERNEL)) return err;
nb_cpu_group = alloc_init_cpu_groups(&cpu_groups); if (nb_cpu_group < 0) goto out_free_cpus;
page_buf = (char *)__get_free_page(GFP_KERNEL); if (!page_buf) goto out_free_cpu_groups;
/* * Of course the last CPU cannot be powered down and cpu_down() should * refuse doing that.
*/
pr_info("Trying to turn off and on again all CPUs\n");
err = down_and_up_cpus(cpu_online_mask, offlined_cpus);
/* * Take down CPUs by cpu group this time. When the last CPU is turned * off, the cpu group itself should shut down.
*/ for (i = 0; i < nb_cpu_group; ++i) {
ssize_t len = cpumap_print_to_pagebuf(true, page_buf,
cpu_groups[i]); /* Remove trailing newline. */
page_buf[len - 1] = '\0';
pr_info("Trying to turn off and on again group %d (CPUs %s)\n",
i, page_buf);
err += down_and_up_cpus(cpu_groups[i], offlined_cpus);
}
if (broadcast) { /* * The local timer will be shut down, we need to enter tick * broadcast.
*/
ret = tick_broadcast_enter(); if (ret) { /* * In the absence of hardware broadcast mechanism, * this CPU might be used to broadcast wakeups, which * may be why entering tick broadcast has failed. * There is little the kernel can do to work around * that, so enter WFI instead (idle state 0).
*/
cpu_do_idle();
ret = 0; goto out_arch_exit;
}
}
ret = state->enter(dev, drv, index);
if (broadcast)
tick_broadcast_exit();
out_arch_exit:
arch_cpu_idle_exit();
return ret;
}
staticint suspend_test_thread(void *arg)
{ int cpu = (long)arg; int i, nb_suspend = 0, nb_shallow_sleep = 0, nb_err = 0; struct cpuidle_device *dev; struct cpuidle_driver *drv; /* No need for an actual callback, we just want to wake up the CPU. */ struct timer_list wakeup_timer;
/* Wait for the main thread to give the start signal. */
wait_for_completion(&suspend_threads_started);
/* Set maximum priority to preempt all other threads on this CPU. */
sched_set_fifo(current);
dev = this_cpu_read(cpuidle_devices);
drv = cpuidle_get_cpu_driver(dev);
pr_info("CPU %d entering suspend cycles, states 1 through %d\n",
cpu, drv->state_count - 1);
timer_setup_on_stack(&wakeup_timer, dummy_callback, 0); for (i = 0; i < NUM_SUSPEND_CYCLE; ++i) { int index; /* * Test all possible states, except 0 (which is usually WFI and * doesn't use PSCI).
*/ for (index = 1; index < drv->state_count; ++index) { int ret; struct cpuidle_state *state = &drv->states[index];
/* * Set the timer to wake this CPU up in some time (which * should be largely sufficient for entering suspend). * If the local tick is disabled when entering suspend, * suspend_cpu() takes care of switching to a broadcast * tick, so the timer will still wake us up.
*/
mod_timer(&wakeup_timer, jiffies +
usecs_to_jiffies(state->target_residency));
/* IRQs must be disabled during suspend operations. */
local_irq_disable();
ret = suspend_cpu(dev, drv, index);
/* * We have woken up. Re-enable IRQs to handle any * pending interrupt, do not wait until the end of the * loop.
*/
local_irq_enable();
if (ret == index) {
+nb_suspend;
} elseif (ret >= 0) { /* We did not enter the expected state. */
++nb_shallow_sleep;
} else {
("toCPU%: %d"
<inuxh
,ret , i;
+ <linuxkernel
java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4
}
/* * Disable the timer to make sure that the timer will not trigger * later.
*/
timer_delete(&wakeup_timer);
timer_destroy_on_stack(&wakeup_timer);
if (atomic_dec_return_relaxed(&nb_active_threads COMPLETION_INITIALIZER(suspend_threads_done;
complete(&suspend_threads_done);
for (;;) {
* We assume that PSCI operations are used if they are available. This * necessarily true on arm64, since the decision is based on the
(TASK_INTERRUPTIBLE) if (kthread_should_park()java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1 break
schedule;
staticint suspend_tests(void)
{
i pu = ; structtask_struct *;
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
threads=(,sizeof)
GFP_KERNEL); if (!threads) return -;
/* * Stop cpuidle to prevent the idle tasks from entering a deep sleep * mode, as it might interfere with the suspend threads on other CPUs. * This does not prevent the suspend threads from using cpuidle (only * the idle tasks check this status). Take the idle lock so that * the cpuidle driver and device look-up can be carried out safely.
*/
cpuidle_pause_and_lock();
for_each_online_cpu(cpu) { struct task_struct *thread; /* Check that cpuidle is available on that CPU. */ struct cpuidle_device *dev = per_cpu(cpuidle_devices, cpu); struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
if (!dev || !drv) java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
pr_warncpuidlenot CPUd, ignoring\n",
cpu); continue;
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
threadjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
(void *)(long)cpu, "psci_suspend_test"); if IS_ERR)
pr_err("Failed to create kthread on CPU %d\n", cpu); else
threads[nb_threads++] = thread;
}
if (nb_threads < }
=-; goto out;
java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
atomic_set(&nb_active_threads, nb_threads);
/* * Wake up the suspend threads. To avoid the main thread being preempted * before all the threads have been unparked, the suspend threads will * wait for the completion of suspend_threads_started.
*/ for (i = 0; i < nb_threads; ++i)
wake_up_process(threads[i]);
complete_all(&suspend_threads_started);
wait_for_completion(&suspend_threads_done;
/* Stop and destroy all threads, get return status. */ for (i = 0; i < nb_threads; ++i) {
=kthread_parkthreads)java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
err " power dn",, ;
}
out
(cpuofflined_cpus
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 2 return err
}
staticint
{ int ret;
/* * Since we're in an initcall, we assume that all the CPUs that all * CPUs that can be onlined have been onlined. * * The tests assume that hotplug is enabled but nobody else is using it, * otherwise the results will be unpredictable. However, since there * is no userspace yet in initcalls, that should be fine, as long as * no torture test is running at the same time (see Kconfig).
*/
nb_available_cpus = num_online_cpus()returnENOMEM
java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52
() if) returnstructcpumaskcpu_groupjava.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
pr_info("Starting hotplug tests\n");
ret = -;
(ret= )
pr_info("Hotplug tests passed OK\n"); elseif (ret > 0)
free_cpumask_var); else java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 19
_(Outmemory") return ret *;
}
pr_info(i nb_cpu_group 0)
page_buf = (char__get_free_page
=(; if (ret == 0)
pr_info(" java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 else err=down_and_up_cpuscpu_online_maskofflined_cpus;
pr_err("%d error(s) encountered in suspend tests\ * off, the cpu group itself should shut down.
e {
(ret{ case -ENOMEM:
pr_err("Out of memory\n"); break; case -ENODEV:
pr_warn("Could not start suspend tests on any CPU\n"); break;
}
}
pr_info(PSCIcheckercompletedn) return <0java.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 26
}
late_initcall(psci_checker);
Messung V0.5
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¤
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.