Пример #1
0
int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
{
	int ret;
	int flag = 0;
	unsigned long timeout;

	pr_debug("Starting secondary CPU %d\n", cpu);

	
	preset_lpj = loops_per_jiffy;

	if (cpu > 0 && cpu < ARRAY_SIZE(cold_boot_flags))
		flag = cold_boot_flags[cpu];
	else
		__WARN();

	if (per_cpu(cold_boot_done, cpu) == false) {
		init_cpu_debug_counter_for_cold_boot();
		ret = scm_set_boot_addr((void *)
					virt_to_phys(msm_secondary_startup),
					flag);
		if (ret == 0)
			release_secondary(cpu);
		else
			printk(KERN_DEBUG "Failed to set secondary core boot "
					  "address\n");
		per_cpu(cold_boot_done, cpu) = true;
	}

	spin_lock(&boot_lock);

	/*
	 * The secondary processor is waiting to be released from
	 * the holding pen - release it, then wait for it to flag
	 * that it has been released by resetting pen_release.
	 *
	 * Note that "pen_release" is the hardware CPU ID, whereas
	 * "cpu" is Linux's internal ID.
	 */
	write_pen_release(cpu_logical_map(cpu));

	gic_raise_softirq(cpumask_of(cpu), 1);

	timeout = jiffies + (1 * HZ);
	while (time_before(jiffies, timeout)) {
		smp_rmb();
		if (pen_release == -1)
			break;

		udelay(10);
	}

	spin_unlock(&boot_lock);

	return pen_release != -1 ? -ENOSYS : 0;
}
Пример #2
0
int boot_secondary(unsigned int cpu, struct task_struct *idle)
{
	int ret;
	int flag = 0;
	unsigned long timeout;

	pr_debug("Starting secondary CPU %d\n", cpu);

	
	preset_lpj = loops_per_jiffy;

	if (cpu > 0 && cpu < ARRAY_SIZE(cold_boot_flags))
		flag = cold_boot_flags[cpu];
	else
		__WARN();

	if (per_cpu(cold_boot_done, cpu) == false) {
		ret = scm_set_boot_addr((void *)
					virt_to_phys(msm_secondary_startup),
					flag);
		if (ret == 0)
			release_secondary(cpu);
		else
			printk(KERN_DEBUG "Failed to set secondary core boot "
					  "address\n");
		per_cpu(cold_boot_done, cpu) = true;
		init_cpu_debug_counter_for_cold_boot();
	}

	spin_lock(&boot_lock);

	pen_release = cpu_logical_map(cpu);
	__cpuc_flush_dcache_area((void *)&pen_release, sizeof(pen_release));
	outer_clean_range(__pa(&pen_release), __pa(&pen_release + 1));

	gic_raise_softirq(cpumask_of(cpu), 1);

	timeout = jiffies + (1 * HZ);
	while (time_before(jiffies, timeout)) {
		smp_rmb();
		if (pen_release == -1)
			break;

		dmac_inv_range((void *)&pen_release,
			       (void *)(&pen_release+sizeof(pen_release)));
		udelay(10);
	}

	spin_unlock(&boot_lock);

	return pen_release != -1 ? -ENOSYS : 0;
}
Пример #3
0
/* Executed by primary CPU, brings other CPUs out of reset. Called at boot
   as well as when a CPU is coming out of shutdown induced by echo 0 >
   /sys/devices/.../cpuX.
*/
int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
{
	int cnt = 0;
	int ret;
	int flag = 0;

	pr_debug("Starting secondary CPU %d\n", cpu);

	/* Set preset_lpj to avoid subsequent lpj recalculations */
	preset_lpj = loops_per_jiffy;

	if (cpu > 0 && cpu < ARRAY_SIZE(cold_boot_flags))
		flag = cold_boot_flags[cpu];
	else
		__WARN();

	if (per_cpu(cold_boot_done, cpu) == false) {
		ret = scm_set_boot_addr((void *)
					virt_to_phys(msm_secondary_startup),
					flag);
		if (ret == 0)
			release_secondary(cpu);
		else
			printk(KERN_DEBUG "Failed to set secondary core boot "
					  "address\n");
		per_cpu(cold_boot_done, cpu) = true;
	}

	pen_release = cpu;
	dmac_flush_range((void *)&pen_release,
			 (void *)(&pen_release + sizeof(pen_release)));
	__asm__("sev");
	mb();

	/* Use smp_cross_call() to send a soft interrupt to wake up
	 * the other core.
	 */
	gic_raise_softirq(cpumask_of(cpu), 1);

	while (pen_release != 0xFFFFFFFF) {
		dmac_inv_range((void *)&pen_release,
			       (void *)(&pen_release+sizeof(pen_release)));
		usleep(500);
		if (cnt++ >= 10)
			break;
	}

	return 0;
}
Пример #4
0
int boot_secondary(unsigned int cpu, struct task_struct *idle)
{
	int ret;
	int flag = 0;
	unsigned long timeout;

	pr_debug("Starting secondary CPU %d\n", cpu);

	/* Set preset_lpj to avoid subsequent lpj recalculations */
	preset_lpj = loops_per_jiffy;

	if (cpu > 0 && cpu < ARRAY_SIZE(cold_boot_flags))
		flag = cold_boot_flags[cpu];
	else
		__WARN();

	if (per_cpu(cold_boot_done, cpu) == false) {
		ret = scm_set_boot_addr((void *)
					virt_to_phys(msm_secondary_startup),
					flag);
		if (ret == 0)
			release_secondary(cpu);
		else
			printk(KERN_DEBUG "Failed to set secondary core boot "
					  "address\n");
		per_cpu(cold_boot_done, cpu) = true;
		init_cpu_debug_counter_for_cold_boot();
	}

	/*
	 * set synchronisation state between this boot processor
	 * and the secondary one
	 */
	spin_lock(&boot_lock);

	/*
	 * The secondary processor is waiting to be released from
	 * the holding pen - release it, then wait for it to flag
	 * that it has been released by resetting pen_release.
	 *
	 * Note that "pen_release" is the hardware CPU ID, whereas
	 * "cpu" is Linux's internal ID.
	 */
	pen_release = cpu_logical_map(cpu);
	__cpuc_flush_dcache_area((void *)&pen_release, sizeof(pen_release));
	outer_clean_range(__pa(&pen_release), __pa(&pen_release + 1));

	/*
	 * Send the secondary CPU a soft interrupt, thereby causing
	 * the boot monitor to read the system wide flags register,
	 * and branch to the address found there.
	 */
	gic_raise_softirq(cpumask_of(cpu), 1);

	timeout = jiffies + (1 * HZ);
	while (time_before(jiffies, timeout)) {
		smp_rmb();
		if (pen_release == -1)
			break;

		dmac_inv_range((void *)&pen_release,
			       (void *)(&pen_release+sizeof(pen_release)));
		udelay(10);
	}

	/*
	 * now the secondary core is starting up let it run its
	 * calibrations, then wait for it to finish
	 */
	spin_unlock(&boot_lock);

	return pen_release != -1 ? -ENOSYS : 0;
}