From 643e12da4a4983a34658e33f2b1581caee9cac8c Mon Sep 17 00:00:00 2001 From: Jean-Philippe Brucker Date: Wed, 29 May 2024 14:34:42 +0100 Subject: 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 [ morse: Rewrote commit message ] Signed-off-by: James Morse Tested-by: Miguel Luis Tested-by: Vishnu Pajjuri Tested-by: Jianyong Wu Reviewed-by: Gavin Shan Signed-off-by: Russell King (Oracle) Signed-off-by: Jonathan Cameron Reviewed-by: Jonathan Cameron Link: https://lore.kernel.org/r/20240529133446.28446-16-Jonathan.Cameron@huawei.com Signed-off-by: Catalin Marinas --- arch/arm64/kernel/psci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/arm64/kernel/psci.c') diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c index 29a8e444db83..fabd732d0a2d 100644 --- a/arch/arm64/kernel/psci.c +++ b/arch/arm64/kernel/psci.c @@ -40,7 +40,7 @@ static int cpu_psci_cpu_boot(unsigned int cpu) { phys_addr_t pa_secondary_entry = __pa_symbol(secondary_entry); int err = psci_ops.cpu_on(cpu_logical_map(cpu), pa_secondary_entry); - if (err) + if (err && err != -EPERM) pr_err("failed to boot CPU%d (%d)\n", cpu, err); return err; -- cgit v1.2.3