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[v6,22/25] drivers: firmware: psci: Deal with CPU hotplug when using OSI mode

Message ID 1521046715-30683-23-git-send-email-ulf.hansson@linaro.org
State Superseded
Headers show
Series PM / Domains: Support hierarchical CPU arrangement (PSCI/ARM) | expand

Commit Message

Ulf Hansson March 14, 2018, 4:58 p.m. UTC 
To deal with CPU hotplug when OSI mode is used, the CPU device needs to be
detached from its PM domain (genpd) when putting it offline, otherwise the
CPU becomes considered as being in use from genpd and runtime PM point of
view. Obviously, then we also need to re-attach the CPU device when bring
the CPU back online, so let's do this.

Cc: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

---
 drivers/firmware/psci.c | 8 ++++++++
 1 file changed, 8 insertions(+)

-- 
2.7.4
diff mbox series

Patch

diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index 944d6f6..06f3916 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -190,6 +190,10 @@  static int psci_cpu_off(u32 state)
 	int err;
 	u32 fn;
 
+	/* If running OSI mode, detach the CPU device from its PM domain. */
+	if (psci_osi_mode_enabled)
+		of_genpd_detach_cpu(smp_processor_id());
+
 	fn = psci_function_id[PSCI_FN_CPU_OFF];
 	err = invoke_psci_fn(fn, state, 0, 0);
 	return psci_to_linux_errno(err);
@@ -204,6 +208,10 @@  static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
 	err = invoke_psci_fn(fn, cpuid, entry_point, 0);
 	/* Clear the domain state to start fresh. */
 	psci_set_domain_state(0);
+
+	if (!err && psci_osi_mode_enabled)
+		of_genpd_attach_cpu(cpuid);
+
 	return psci_to_linux_errno(err);
 }