C++ set_cpus_allowed_ptr函数代码示例

/*
 * Set the given thread's cpus_allowed mask so that it
 * will only run on cpus in the given pool.
 */
static inline void
svc_pool_map_set_cpumask(struct task_struct *task, unsigned int pidx)
{
	struct svc_pool_map *m = &svc_pool_map;
	unsigned int node = m->pool_to[pidx];

	/*
	 * The caller checks for sv_nrpools > 1, which
	 * implies that we've been initialized.
	 */
	WARN_ON_ONCE(m->count == 0);
	if (m->count == 0)
		return;

	switch (m->mode) {
	case SVC_POOL_PERCPU:
	{
		set_cpus_allowed_ptr(task, cpumask_of(node));
		break;
	}
	case SVC_POOL_PERNODE:
	{
		set_cpus_allowed_ptr(task, cpumask_of_node(node));
		break;
	}
	}
}

/*
 * After a CPU went down cycle through all the others and rediscover
 * Must run in process context.
 */
void cmci_rediscover(int dying)
{
	int banks;
	int cpu;
	cpumask_var_t old;

	if (!cmci_supported(&banks))
		return;
	if (!alloc_cpumask_var(&old, GFP_KERNEL))
		return;
	cpumask_copy(old, &current->cpus_allowed);

	for_each_online_cpu(cpu) {
		if (cpu == dying)
			continue;
		if (set_cpus_allowed_ptr(current, cpumask_of(cpu)))
			continue;
		/* Recheck banks in case CPUs don't all have the same */
		if (cmci_supported(&banks))
			cmci_discover(banks, 0);
	}

	set_cpus_allowed_ptr(current, old);
	free_cpumask_var(old);
}

void __init smp_cpus_done(unsigned int max_cpus)
{
	cpumask_var_t old_mask;

	/* We want the setup_cpu() here to be called from CPU 0, but our
	 * init thread may have been "borrowed" by another CPU in the meantime
	 * se we pin us down to CPU 0 for a short while
	 */
	alloc_cpumask_var(&old_mask, GFP_NOWAIT);
	cpumask_copy(old_mask, tsk_cpus_allowed(current));
	set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid));
	
	if (smp_ops && smp_ops->setup_cpu)
		smp_ops->setup_cpu(boot_cpuid);

	set_cpus_allowed_ptr(current, old_mask);

	free_cpumask_var(old_mask);

	if (smp_ops && smp_ops->bringup_done)
		smp_ops->bringup_done();

	dump_numa_cpu_topology();

	set_sched_topology(powerpc_topology);

}

int meson_trustzone_efuse(struct efuse_hal_api_arg* arg)
{
	int ret;
	if (!arg) {
		return -1;
	}
	set_cpus_allowed_ptr(current, cpumask_of(0));
	__cpuc_flush_dcache_area(__va(arg->buffer_phy), arg->size);
	outer_clean_range((arg->buffer_phy), (arg->buffer_phy + arg->size));

	__cpuc_flush_dcache_area(__va(arg->retcnt_phy), sizeof(unsigned int));
	outer_clean_range(arg->retcnt_phy, (arg->retcnt_phy + sizeof(unsigned int)));

	__cpuc_flush_dcache_area((void*)arg, sizeof(struct efuse_hal_api_arg));
	outer_clean_range(__pa(arg), __pa(arg + 1));

	ret = meson_smc_hal_api(TRUSTZONE_HAL_API_EFUSE, __pa(arg));

	if (arg->cmd == EFUSE_HAL_API_READ) {
		outer_inv_range((arg->buffer_phy), (arg->buffer_phy + arg->size));
		dmac_unmap_area(__va(arg->buffer_phy), arg->size, DMA_FROM_DEVICE);
	}
	outer_inv_range((arg->retcnt_phy), (arg->retcnt_phy + sizeof(unsigned int)));
	dmac_unmap_area(__va(arg->buffer_phy), arg->size, DMA_FROM_DEVICE);

	return ret;
}

static int
xpc_hb_checker(void *ignore)
{
	int force_IRQ = 0;

	/*                                                */

	set_cpus_allowed_ptr(current, cpumask_of(XPC_HB_CHECK_CPU));

	/*                                                      */
	xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
	xpc_start_hb_beater();

	while (!xpc_exiting) {

		dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have "
			"been received\n",
			(int)(xpc_hb_check_timeout - jiffies),
			xpc_activate_IRQ_rcvd);

		/*                                                         */
		if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) {
			xpc_hb_check_timeout = jiffies +
			    (xpc_hb_check_interval * HZ);

			dev_dbg(xpc_part, "checking remote heartbeats\n");
			xpc_check_remote_hb();

			/*
                                                         
                                     
    */
			if (is_shub())
				force_IRQ = 1;
		}

		/*                            */
		if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) {
			force_IRQ = 0;
			dev_dbg(xpc_part, "processing activate IRQs "
				"received\n");
			xpc_arch_ops.process_activate_IRQ_rcvd();
		}

		/*                         */
		(void)wait_event_interruptible(xpc_activate_IRQ_wq,
					       (time_is_before_eq_jiffies(
						xpc_hb_check_timeout) ||
						xpc_activate_IRQ_rcvd > 0 ||
						xpc_exiting));
	}

	xpc_stop_hb_beater();

	dev_dbg(xpc_part, "heartbeat checker is exiting\n");

	/*                                   */
	complete(&xpc_hb_checker_exited);
	return 0;
}