From 9a4622f63a065f620f0c92ef92eeb2aa5c2b441d Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Wed, 17 Sep 2014 12:00:57 -0500 Subject: [PATCH] arm64: provide run on all cpu but self semantics In order to provide richer semantics for running code on all CPUs add an all-but-self construct. BUG=chrome-os-partner:32082 BRANCH=None TEST=Built and booted to kernel. Change-Id: Id18dc0423bcb0016ed36ace659b3f858e824c46c Signed-off-by: Aaron Durbin Reviewed-on: https://chromium-review.googlesource.com/218652 Reviewed-by: Furquan Shaikh --- src/arch/arm64/cpu.c | 25 +++++++++++++++++++++++++ src/arch/arm64/include/armv8/arch/cpu.h | 2 ++ 2 files changed, 27 insertions(+) diff --git a/src/arch/arm64/cpu.c b/src/arch/arm64/cpu.c index e9781dfe17..491f050d41 100644 --- a/src/arch/arm64/cpu.c +++ b/src/arch/arm64/cpu.c @@ -297,6 +297,21 @@ static int __arch_run_on_all_cpus(struct cpu_action *action, int sync) return 0; } +static int __arch_run_on_all_cpus_but_self(struct cpu_action *action, int sync) +{ + int i; + struct cpu_info *me = cpu_info(); + + for (i = 0; i < CONFIG_MAX_CPUS; i++) { + struct cpu_info *ci = cpu_info_for_cpu(i); + if (ci == me) + continue; + action_run_on_cpu(ci, action, sync); + } + + return 0; +} + int arch_run_on_all_cpus(struct cpu_action *action) { return __arch_run_on_all_cpus(action, 1); @@ -307,6 +322,16 @@ int arch_run_on_all_cpus_async(struct cpu_action *action) return __arch_run_on_all_cpus(action, 0); } +int arch_run_on_all_cpus_but_self(struct cpu_action *action) +{ + return __arch_run_on_all_cpus_but_self(action, 1); +} + +int arch_run_on_all_cpus_but_self_async(struct cpu_action *action) +{ + return __arch_run_on_all_cpus_but_self(action, 0); +} + void arch_secondary_cpu_init(void) { struct cpu_info *ci = cpu_info(); diff --git a/src/arch/arm64/include/armv8/arch/cpu.h b/src/arch/arm64/include/armv8/arch/cpu.h index a5d20c49ac..d2623857aa 100644 --- a/src/arch/arm64/include/armv8/arch/cpu.h +++ b/src/arch/arm64/include/armv8/arch/cpu.h @@ -94,8 +94,10 @@ void arch_initialize_cpus(device_t cluster, struct cpu_control_ops *cntrl_ops); */ int arch_run_on_cpu(unsigned int cpu, struct cpu_action *action); int arch_run_on_all_cpus(struct cpu_action *action); +int arch_run_on_all_cpus_but_self(struct cpu_action *action); int arch_run_on_cpu_async(unsigned int cpu, struct cpu_action *action); int arch_run_on_all_cpus_async(struct cpu_action *action); +int arch_run_on_all_cpus_but_self_async(struct cpu_action *action); #endif /* !__PRE_RAM__ */