From: Suzuki K Poulose suzuki.poulose@arm.com
[ Upstream commit cce360b54ce6ca1bcf4b0a870ec076d83606775e ]
While processing the list of capabilities, it is useful to filter out some of the entries based on the given mask for the scope of the capabilities to allow better control. This can be used later for handling LOCAL vs SYSTEM wide capabilities and more. All capabilities should have their scope set to either LOCAL_CPU or SYSTEM. No functional/flow change.
Cc: Will Deacon will.deacon@arm.com Cc: Mark Rutland mark.rutland@arm.com Reviewed-by: Dave Martin dave.martin@arm.com Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com Signed-off-by: Will Deacon will.deacon@arm.com Signed-off-by: Ard Biesheuvel ard.biesheuvel@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm64/include/asm/cpufeature.h | 1 + arch/arm64/kernel/cpufeature.c | 33 ++++++++++++++++++++++----------- 2 files changed, 23 insertions(+), 11 deletions(-)
--- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -207,6 +207,7 @@ extern struct arm64_ftr_reg arm64_ftr_re
#define SCOPE_SYSTEM ARM64_CPUCAP_SCOPE_SYSTEM #define SCOPE_LOCAL_CPU ARM64_CPUCAP_SCOPE_LOCAL_CPU +#define SCOPE_ALL ARM64_CPUCAP_SCOPE_MASK
/* * Is it permitted for a late CPU to have this capability when system --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1164,10 +1164,12 @@ static bool __this_cpu_has_cap(const str }
static void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps, - const char *info) + u16 scope_mask, const char *info) { + scope_mask &= ARM64_CPUCAP_SCOPE_MASK; for (; caps->matches; caps++) { - if (!caps->matches(caps, cpucap_default_scope(caps))) + if (!(caps->type & scope_mask) || + !caps->matches(caps, cpucap_default_scope(caps))) continue;
if (!cpus_have_cap(caps->capability) && caps->desc) @@ -1189,12 +1191,14 @@ static int __enable_cpu_capability(void * CPUs */ static void __init -enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps) +enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps, + u16 scope_mask) { + scope_mask &= ARM64_CPUCAP_SCOPE_MASK; for (; caps->matches; caps++) { unsigned int num = caps->capability;
- if (!cpus_have_cap(num)) + if (!(caps->type & scope_mask) || !cpus_have_cap(num)) continue;
/* Ensure cpus_have_const_cap(num) works */ @@ -1236,12 +1240,18 @@ static inline void set_sys_caps_initiali * Returns "false" on conflicts. */ static bool -__verify_local_cpu_caps(const struct arm64_cpu_capabilities *caps_list) +__verify_local_cpu_caps(const struct arm64_cpu_capabilities *caps_list, + u16 scope_mask) { bool cpu_has_cap, system_has_cap; const struct arm64_cpu_capabilities *caps;
+ scope_mask &= ARM64_CPUCAP_SCOPE_MASK; + for (caps = caps_list; caps->matches; caps++) { + if (!(caps->type & scope_mask)) + continue; + cpu_has_cap = __this_cpu_has_cap(caps_list, caps->capability); system_has_cap = cpus_have_cap(caps->capability);
@@ -1304,7 +1314,7 @@ verify_local_elf_hwcaps(const struct arm
static void verify_local_cpu_features(void) { - if (!__verify_local_cpu_caps(arm64_features)) + if (!__verify_local_cpu_caps(arm64_features, SCOPE_ALL)) cpu_die_early(); }
@@ -1315,18 +1325,19 @@ static void verify_local_cpu_features(vo */ static void verify_local_cpu_errata_workarounds(void) { - if (!__verify_local_cpu_caps(arm64_errata)) + if (!__verify_local_cpu_caps(arm64_errata, SCOPE_ALL)) cpu_die_early(); }
static void update_cpu_errata_workarounds(void) { - update_cpu_capabilities(arm64_errata, "enabling workaround for"); + update_cpu_capabilities(arm64_errata, SCOPE_ALL, + "enabling workaround for"); }
static void __init enable_errata_workarounds(void) { - enable_cpu_capabilities(arm64_errata); + enable_cpu_capabilities(arm64_errata, SCOPE_ALL); }
/* @@ -1368,8 +1379,8 @@ void check_local_cpu_capabilities(void)
static void __init setup_feature_capabilities(void) { - update_cpu_capabilities(arm64_features, "detected feature:"); - enable_cpu_capabilities(arm64_features); + update_cpu_capabilities(arm64_features, SCOPE_ALL, "detected:"); + enable_cpu_capabilities(arm64_features, SCOPE_ALL); }
DEFINE_STATIC_KEY_FALSE(arm64_const_caps_ready);