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ARM: 9257/1: Disable FIQs (but not IRQs) on CPUs shutdown paths

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Currently the regular CPU shutdown path for ARM disables IRQs/FIQs
in the secondary CPUs - smp_send_stop() calls ipi_cpu_stop(), which
is responsible for that. IRQs are architecturally masked when we
take an interrupt, but FIQs are high priority than IRQs, hence they
aren't masked. With that said, it makes sense to disable FIQs here,
but there's no need for (re-)disabling IRQs.

More than that: there is an alternative path for disabling CPUs,
in the form of function crash_smp_send_stop(), which is used for
kexec/panic path. This function relies on a SMP call that also
triggers a busy-wait loop [at machine_crash_nonpanic_core()], but
without disabling FIQs. This might lead to odd scenarios, like
early interrupts in the boot of kexec'd kernel or even interrupts
in secondary "disabled" CPUs while the main one still works in the
panic path and assumes all secondary CPUs are (really!) off.

So, let's disable FIQs in both paths and *not* disable IRQs a second
time, since they are already masked in both paths by the architecture.
This way, we keep both CPU quiesce paths consistent and safe.

Cc: Marc Zyngier <maz@kernel.org>
Cc: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Guilherme G. Piccoli 2022-10-17 20:41:30 +01:00 committed by Russell King (Oracle)
parent 3220022038
commit 8fc0b333a7
2 changed files with 4 additions and 3 deletions
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2
arch/arm/kernel/machine_kexec.c
View file

@ -77,6 +77,8 @@ void machine_crash_nonpanic_core(void *unused)
{
struct pt_regs regs;
local_fiq_disable();
crash_setup_regs(&regs, get_irq_regs());
printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
smp_processor_id());

5
arch/arm/kernel/smp.c
View file

@ -600,6 +600,8 @@ static DEFINE_RAW_SPINLOCK(stop_lock);
*/
static void ipi_cpu_stop(unsigned int cpu)
{
local_fiq_disable();
if (system_state <= SYSTEM_RUNNING) {
raw_spin_lock(&stop_lock);
pr_crit("CPU%u: stopping\n", cpu);
@ -609,9 +611,6 @@ static void ipi_cpu_stop(unsigned int cpu)
set_cpu_online(cpu, false);
local_fiq_disable();
local_irq_disable();
while (1) {
cpu_relax();
wfe();