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powerpc/mpc85xx: Add hotplug support on E5500 and E500MC cores

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Freescale E500MC and E5500 core-based platforms, like P4080, T1040,
support disabling/enabling CPU dynamically.
This patch adds this feature on those platforms.

Signed-off-by: Chenhui Zhao <chenhui.zhao@freescale.com>
Signed-off-by: Tang Yuantian <Yuantian.Tang@feescale.com>
[scottwood: removed unused pr_fmt]
Signed-off-by: Scott Wood <oss@buserror.net>
This commit is contained in:
chenhui zhao
2015-11-20 17:14:01 +08:00
committed by Scott Wood
parent 56f1ba2807
commit 2f4f1f815b
4 changed files with 134 additions and 106 deletions
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7
arch/powerpc/kernel/smp.c
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@@ -427,7 +427,7 @@ void generic_cpu_die(unsigned int cpu)
for (i = 0; i < 100; i++) {
smp_rmb();
if (per_cpu(cpu_state, cpu) == CPU_DEAD)
if (is_cpu_dead(cpu))
return;
msleep(100);
}
@@ -454,6 +454,11 @@ int generic_check_cpu_restart(unsigned int cpu)
return per_cpu(cpu_state, cpu) == CPU_UP_PREPARE;
}
int is_cpu_dead(unsigned int cpu)
{
return per_cpu(cpu_state, cpu) == CPU_DEAD;
}
static bool secondaries_inhibited(void)
{
return kvm_hv_mode_active();