From mboxrd@z Thu Jan 1 00:00:00 1970 From: james.morse@arm.com (James Morse) Date: Fri, 17 Jul 2015 18:30:18 +0100 Subject: [PATCH v2 3/6] arm64: kernel: Add cpufeature 'enable' callback In-Reply-To: <1437154221-5736-1-git-send-email-james.morse@arm.com> References: <1437154221-5736-1-git-send-email-james.morse@arm.com> Message-ID: <1437154221-5736-4-git-send-email-james.morse@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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. Signed-off-by: James Morse Cc: Catalin Marinas Cc: Will Deacon Acked-by: Catalin Marinas --- arch/arm64/include/asm/cpufeature.h | 1 + arch/arm64/kernel/cpufeature.c | 6 ++++++ 2 files changed, 7 insertions(+) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 56c843918504..7456fc44bee1 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -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; diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 5ad86ceac010..650ffc28bedc 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -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) -- 2.1.4