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arm64: kernel: Add cpufeature 'enable' callback

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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>
This commit is contained in:
James Morse 2015-07-21 13:23:28 +01:00 • committed by Will Deacon
parent 870828e57b
commit 1c0763037f
2 changed files with 7 additions and 0 deletions
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1
arch/arm64/include/asm/cpufeature.h
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@ -34,6 +34,7 @@ struct arm64_cpu_capabilities {
const char *desc; const char *desc;
u16 capability; u16 capability;
bool (*matches)(const struct arm64_cpu_capabilities *); bool (*matches)(const struct arm64_cpu_capabilities *);
void (*enable)(void);
union { union {
struct { /* To be used for erratum handling only */ struct { /* To be used for erratum handling only */
u32 midr_model; u32 midr_model;

6
arch/arm64/kernel/cpufeature.c
View file

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