Hi,
If CPU power off info is already known when the PSCI SMC is received in EL3, adding a platform hook early in `psci_do_cpu_off()` [1] may save rolling back any activity. It can return PSCI_E_DENIED.
[1] https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+...
On Fri, Apr 21, 2023 at 1:43 PM Varun Wadekar via TF-A < tf-a@lists.trustedfirmware.org> wrote:
Hello,
We have a use case where we want to deny the CPU power off from a certain PE. The current lib/psci does not provide a way for a platform to do this. We have support to return an error from svc_off, but this does not cover the scenario where svc_off is NULL.
There are multiple ways of handling this scenario.
- Introduce a new platform function to check if CPU_OFF is allowed on
the core 2. Return an error code from the pwr_domain_off() handler and unwind the CPU_OFF request 3. Something else.
Any suggestions?
-Varun
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