Re: [PATCH RFC v3 16/21] arm64: psci: Ignore DENIED CPUs
Jonathan Cameron <[email protected]> Fri, 15 Dec 2023 16:40:27 +0000
| Newsgroups | gmane.linux.acpi.devel,gmane.linux.power-management.general,gmane.linux.kernel.cross-arch,gmane.linux.kernel,gmane.linux.ports.arm.kernel,gmane.linux.ports.riscv,gmane.linux.documentation,gmane.linux.ports.ia64,gmane.linux.ports.parisc |
|---|---|
| Organization | Huawei Technologies Research and Development (UK) Ltd. |
| Message-ID | <[email protected]> |
On Wed, 13 Dec 2023 12:50:33 +0000 Russell King (Oracle) <[email protected]> wrote: > From: Jean-Philippe Brucker <[email protected]> > > When a CPU is marked as disabled, but online capable in the MADT, PSCI > applies some firmware policy to control when it can be brought online. > PSCI returns DENIED to a CPU_ON request if this is not currently > permitted. The OS can learn the current policy from the _STA enabled bit. > > Handle the PSCI DENIED return code gracefully instead of printing an > error. > > See https://developer.arm.com/documentation/den0022/f/?lang=en page 58. > > Signed-off-by: Jean-Philippe Brucker <[email protected]> > [ morse: Rewrote commit message ] > Signed-off-by: James Morse <[email protected]> > Tested-by: Miguel Luis <[email protected]> > Tested-by: Vishnu Pajjuri <[email protected]> > Tested-by: Jianyong Wu <[email protected]> > Signed-off-by: Russell King (Oracle) <[email protected]> Reviewed-by: Jonathan Cameron <[email protected]>