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| author | Jean-Philippe Brucker <[email protected]> | 2024-05-29 14:34:42 +0100 |
|---|---|---|
| committer | Catalin Marinas <[email protected]> | 2024-06-28 18:38:31 +0100 |
| commit | 643e12da4a4983a34658e33f2b1581caee9cac8c (patch) | |
| tree | 41063efa666f729411297302cd2ede8d0244d8e1 /lib/memory-notifier-error-inject.c | |
| parent | d633da5d3ab1a0eb26a2213d65da1e189e82f8ab (diff) | |
arm64: psci: Ignore DENIED CPUs
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.
Note the alternatives to the PSCI cpu_boot() callback do not
return -EPERM so the change in smp.c has no affect.
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]>
Reviewed-by: Gavin Shan <[email protected]>
Signed-off-by: Russell King (Oracle) <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>
Diffstat (limited to 'lib/memory-notifier-error-inject.c')
0 files changed, 0 insertions, 0 deletions