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SubjectRe: [PATCH v3 08/22] arm64: capabilities: Prepare for grouping features and errata work arounds
On Fri, Feb 09, 2018 at 05:54:45PM +0000, Suzuki K Poulose wrote:
> We are about to group the handling of all capabilities (features
> and errata workarounds). This patch open codes the wrapper routines
> to make it easier to merge the handling.
>
> Cc: Dave Martin <dave.martin@arm.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>

This seems to make sense as a no-functional-change bit of refactoring.

Reviewed-by: Dave Martin <Dave.Martin@arm.com>

> ---
> arch/arm64/kernel/cpufeature.c | 60 +++++++++++++-----------------------------
> 1 file changed, 19 insertions(+), 41 deletions(-)
>
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index 3447821bec5a..9f52678a4df1 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -504,7 +504,8 @@ static void __init init_cpu_ftr_reg(u32 sys_reg, u64 new)
> }
>
> extern const struct arm64_cpu_capabilities arm64_errata[];
> -static void update_cpu_errata_workarounds(void);
> +static void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
> + u16 scope_mask, const char *info);
>
> void __init init_cpu_features(struct cpuinfo_arm64 *info)
> {
> @@ -553,7 +554,8 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info)
> * Run the errata work around checks on the boot CPU, once we have
> * initialised the cpu feature infrastructure.
> */
> - update_cpu_errata_workarounds();
> + update_cpu_capabilities(arm64_errata, SCOPE_ALL,
> + "enabling workaround for");
> }
>
> static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new)
> @@ -1350,12 +1352,6 @@ verify_local_elf_hwcaps(const struct arm64_cpu_capabilities *caps)
> }
> }
>
> -static void verify_local_cpu_features(void)
> -{
> - if (!__verify_local_cpu_caps(arm64_features, SCOPE_ALL))
> - cpu_die_early();
> -}
> -
> static void verify_sve_features(void)
> {
> u64 safe_zcr = read_sanitised_ftr_reg(SYS_ZCR_EL1);
> @@ -1373,27 +1369,6 @@ static void verify_sve_features(void)
> /* Add checks on other ZCR bits here if necessary */
> }
>
> -/*
> - * The CPU Errata work arounds are detected and applied at boot time
> - * and the related information is freed soon after. If the new CPU requires
> - * an errata not detected at boot, fail this CPU.
> - */
> -static void verify_local_cpu_errata_workarounds(void)
> -{
> - if (!__verify_local_cpu_caps(arm64_errata, SCOPE_ALL))
> - cpu_die_early();
> -}
> -
> -static void update_cpu_errata_workarounds(void)
> -{
> - update_cpu_capabilities(arm64_errata, SCOPE_ALL,
> - "enabling workaround for");
> -}
> -
> -static void __init enable_errata_workarounds(void)
> -{
> - enable_cpu_capabilities(arm64_errata, SCOPE_ALL);
> -}
>
> /*
> * Run through the enabled system capabilities and enable() it on this CPU.
> @@ -1405,8 +1380,15 @@ static void __init enable_errata_workarounds(void)
> */
> static void verify_local_cpu_capabilities(void)
> {
> - verify_local_cpu_errata_workarounds();
> - verify_local_cpu_features();
> + /*
> + * The CPU Errata work arounds are detected and applied at boot time
> + * and the related information is freed soon after. If the new CPU
> + * requires an errata not detected at boot, fail this CPU.
> + */
> + if (!__verify_local_cpu_caps(arm64_errata, SCOPE_ALL))
> + cpu_die_early();
> + if (!__verify_local_cpu_caps(arm64_features, SCOPE_ALL))
> + cpu_die_early();
> verify_local_elf_hwcaps(arm64_elf_hwcaps);
>
> if (system_supports_32bit_el0())
> @@ -1434,18 +1416,12 @@ void check_local_cpu_capabilities(void)
> * advertised capabilities.
> */
> if (!sys_caps_initialised)
> - update_cpu_errata_workarounds();
> + update_cpu_capabilities(arm64_errata, SCOPE_ALL,
> + "enabling workaround for");
> else
> verify_local_cpu_capabilities();
> }
>
> -static void __init setup_feature_capabilities(void)
> -{
> - update_cpu_capabilities(arm64_features, SCOPE_ALL,
> - "detected feature:");
> - enable_cpu_capabilities(arm64_features, SCOPE_ALL);
> -}
> -
> DEFINE_STATIC_KEY_FALSE(arm64_const_caps_ready);
> EXPORT_SYMBOL(arm64_const_caps_ready);
>
> @@ -1468,8 +1444,10 @@ void __init setup_cpu_features(void)
> int cls;
>
> /* Set the CPU feature capabilies */
> - setup_feature_capabilities();
> - enable_errata_workarounds();
> + update_cpu_capabilities(arm64_features, SCOPE_ALL,
> + "detected feature:");
> + enable_cpu_capabilities(arm64_features, SCOPE_ALL);
> + enable_cpu_capabilities(arm64_errata, SCOPE_ALL);
> mark_const_caps_ready();
> setup_elf_hwcaps(arm64_elf_hwcaps);
>
> --
> 2.14.3
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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