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Commit 1c076303 authored Jul 21, 2015 by James Morse Committed by Will Deacon Jul 27, 2015

arm64: kernel: Add cpufeature 'enable' callback



This patch adds an 'enable()' callback to cpu capability/feature
detection, allowing features that require some setup or configuration
to get this opportunity once the feature has been detected.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

parent 870828e5

arch/arm64/include/asm/cpufeature.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -34,6 +34,7 @@ struct arm64_cpu_capabilities {
		const char *desc;
		u16 capability;
		bool (matches)(const struct arm64_cpu_capabilities );
		void (*enable)(void);
		union {
		struct { /* To be used for erratum handling only */
		u32 midr_model;

arch/arm64/kernel/cpufeature.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -55,6 +55,12 @@ void check_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
		pr_info("%s %s\n", info, caps[i].desc);
		cpus_set_cap(caps[i].capability);
		}

		/* second pass allows enable() to consider interacting capabilities */
		for (i = 0; caps[i].desc; i++) {
		if (cpus_have_cap(caps[i].capability) && caps[i].enable)
		caps[i].enable();
		}
		}

		void check_local_cpu_features(void)