forked from luck/tmp_suning_uos_patched
ARM: 7848/1: mcpm: Implement cpu_kill() to synchronise on powerdown
CPU hotplug and kexec rely on smp_ops.cpu_kill(), which is supposed to wait for the CPU to park or power down, and perform the last rites (such as disabling clocks etc., where the platform doesn't do this automatically). kexec in particular is unsafe without performing this synchronisation to park secondaries. Without it, the secondaries might not be parked when kexec trashes the kernel. There is no generic way to do this synchronisation, so a new mcpm platform_ops method power_down_finish() is added by this patch. The new method is mandatory. A platform which provides no way to detect when CPUs are parked is likely broken. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Reviewed-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
parent
1e5660999a
commit
0de0d64675
|
@ -90,6 +90,21 @@ void mcpm_cpu_power_down(void)
|
|||
BUG();
|
||||
}
|
||||
|
||||
int mcpm_cpu_power_down_finish(unsigned int cpu, unsigned int cluster)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (WARN_ON_ONCE(!platform_ops || !platform_ops->power_down_finish))
|
||||
return -EUNATCH;
|
||||
|
||||
ret = platform_ops->power_down_finish(cpu, cluster);
|
||||
if (ret)
|
||||
pr_warn("%s: cpu %u, cluster %u failed to power down (%d)\n",
|
||||
__func__, cpu, cluster, ret);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
void mcpm_cpu_suspend(u64 expected_residency)
|
||||
{
|
||||
phys_reset_t phys_reset;
|
||||
|
|
|
@ -56,6 +56,15 @@ static void mcpm_secondary_init(unsigned int cpu)
|
|||
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
|
||||
static int mcpm_cpu_kill(unsigned int cpu)
|
||||
{
|
||||
unsigned int pcpu, pcluster;
|
||||
|
||||
cpu_to_pcpu(cpu, &pcpu, &pcluster);
|
||||
|
||||
return !mcpm_cpu_power_down_finish(pcpu, pcluster);
|
||||
}
|
||||
|
||||
static int mcpm_cpu_disable(unsigned int cpu)
|
||||
{
|
||||
/*
|
||||
|
@ -82,6 +91,7 @@ static struct smp_operations __initdata mcpm_smp_ops = {
|
|||
.smp_boot_secondary = mcpm_boot_secondary,
|
||||
.smp_secondary_init = mcpm_secondary_init,
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
.cpu_kill = mcpm_cpu_kill,
|
||||
.cpu_disable = mcpm_cpu_disable,
|
||||
.cpu_die = mcpm_cpu_die,
|
||||
#endif
|
||||
|
|
|
@ -81,9 +81,39 @@ int mcpm_cpu_power_up(unsigned int cpu, unsigned int cluster);
|
|||
*
|
||||
* This will return if mcpm_platform_register() has not been called
|
||||
* previously in which case the caller should take appropriate action.
|
||||
*
|
||||
* On success, the CPU is not guaranteed to be truly halted until
|
||||
* mcpm_cpu_power_down_finish() subsequently returns non-zero for the
|
||||
* specified cpu. Until then, other CPUs should make sure they do not
|
||||
* trash memory the target CPU might be executing/accessing.
|
||||
*/
|
||||
void mcpm_cpu_power_down(void);
|
||||
|
||||
/**
|
||||
* mcpm_cpu_power_down_finish - wait for a specified CPU to halt, and
|
||||
* make sure it is powered off
|
||||
*
|
||||
* @cpu: CPU number within given cluster
|
||||
* @cluster: cluster number for the CPU
|
||||
*
|
||||
* Call this function to ensure that a pending powerdown has taken
|
||||
* effect and the CPU is safely parked before performing non-mcpm
|
||||
* operations that may affect the CPU (such as kexec trashing the
|
||||
* kernel text).
|
||||
*
|
||||
* It is *not* necessary to call this function if you only need to
|
||||
* serialise a pending powerdown with mcpm_cpu_power_up() or a wakeup
|
||||
* event.
|
||||
*
|
||||
* Do not call this function unless the specified CPU has already
|
||||
* called mcpm_cpu_power_down() or has committed to doing so.
|
||||
*
|
||||
* @return:
|
||||
* - zero if the CPU is in a safely parked state
|
||||
* - nonzero otherwise (e.g., timeout)
|
||||
*/
|
||||
int mcpm_cpu_power_down_finish(unsigned int cpu, unsigned int cluster);
|
||||
|
||||
/**
|
||||
* mcpm_cpu_suspend - bring the calling CPU in a suspended state
|
||||
*
|
||||
|
@ -126,6 +156,7 @@ int mcpm_cpu_powered_up(void);
|
|||
struct mcpm_platform_ops {
|
||||
int (*power_up)(unsigned int cpu, unsigned int cluster);
|
||||
void (*power_down)(void);
|
||||
int (*power_down_finish)(unsigned int cpu, unsigned int cluster);
|
||||
void (*suspend)(u64);
|
||||
void (*powered_up)(void);
|
||||
};
|
||||
|
|
Loading…
Reference in New Issue
Block a user