diff options
| -rw-r--r-- | arch/arm64/include/asm/alternative-macros.h | 8 | ||||
| -rw-r--r-- | arch/arm64/include/asm/cpucaps.h | 41 | ||||
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 39 |
3 files changed, 59 insertions, 29 deletions
diff --git a/arch/arm64/include/asm/alternative-macros.h b/arch/arm64/include/asm/alternative-macros.h index 94b486192e1f..210bb43cff2c 100644 --- a/arch/arm64/include/asm/alternative-macros.h +++ b/arch/arm64/include/asm/alternative-macros.h @@ -226,8 +226,8 @@ alternative_endif static __always_inline bool alternative_has_cap_likely(const unsigned long cpucap) { - compiletime_assert(cpucap < ARM64_NCAPS, - "cpucap must be < ARM64_NCAPS"); + if (!cpucap_is_possible(cpucap)) + return false; asm_volatile_goto( ALTERNATIVE_CB("b %l[l_no]", %[cpucap], alt_cb_patch_nops) @@ -244,8 +244,8 @@ l_no: static __always_inline bool alternative_has_cap_unlikely(const unsigned long cpucap) { - compiletime_assert(cpucap < ARM64_NCAPS, - "cpucap must be < ARM64_NCAPS"); + if (!cpucap_is_possible(cpucap)) + return false; asm_volatile_goto( ALTERNATIVE("nop", "b %l[l_yes]", %[cpucap]) diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h index 7333b5bbf448..764ad4eef859 100644 --- a/arch/arm64/include/asm/cpucaps.h +++ b/arch/arm64/include/asm/cpucaps.h @@ -5,4 +5,45 @@ #include <asm/cpucap-defs.h> +#ifndef __ASSEMBLY__ +#include <linux/types.h> +/* + * Check whether a cpucap is possible at compiletime. + */ +static __always_inline bool +cpucap_is_possible(const unsigned int cap) +{ + compiletime_assert(__builtin_constant_p(cap), + "cap must be a constant"); + compiletime_assert(cap < ARM64_NCAPS, + "cap must be < ARM64_NCAPS"); + + switch (cap) { + case ARM64_HAS_PAN: + return IS_ENABLED(CONFIG_ARM64_PAN); + case ARM64_SVE: + return IS_ENABLED(CONFIG_ARM64_SVE); + case ARM64_SME: + case ARM64_SME2: + case ARM64_SME_FA64: + return IS_ENABLED(CONFIG_ARM64_SME); + case ARM64_HAS_CNP: + return IS_ENABLED(CONFIG_ARM64_CNP); + case ARM64_HAS_ADDRESS_AUTH: + case ARM64_HAS_GENERIC_AUTH: + return IS_ENABLED(CONFIG_ARM64_PTR_AUTH); + case ARM64_HAS_GIC_PRIO_MASKING: + return IS_ENABLED(CONFIG_ARM64_PSEUDO_NMI); + case ARM64_MTE: + return IS_ENABLED(CONFIG_ARM64_MTE); + case ARM64_BTI: + return IS_ENABLED(CONFIG_ARM64_BTI); + case ARM64_HAS_TLB_RANGE: + return IS_ENABLED(CONFIG_ARM64_TLB_RANGE); + } + + return true; +} +#endif /* __ASSEMBLY__ */ + #endif /* __ASM_CPUCAPS_H */ diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 5bba39376055..577d9766e5ab 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -450,6 +450,8 @@ static __always_inline bool system_capabilities_finalized(void) */ static __always_inline bool cpus_have_cap(unsigned int num) { + if (__builtin_constant_p(num) && !cpucap_is_possible(num)) + return false; if (num >= ARM64_NCAPS) return false; return arch_test_bit(num, system_cpucaps); @@ -465,8 +467,6 @@ static __always_inline bool cpus_have_cap(unsigned int num) */ static __always_inline bool __cpus_have_const_cap(int num) { - if (num >= ARM64_NCAPS) - return false; return alternative_has_cap_unlikely(num); } @@ -740,8 +740,7 @@ static __always_inline bool system_supports_fpsimd(void) static inline bool system_uses_hw_pan(void) { - return IS_ENABLED(CONFIG_ARM64_PAN) && - cpus_have_const_cap(ARM64_HAS_PAN); + return cpus_have_const_cap(ARM64_HAS_PAN); } static inline bool system_uses_ttbr0_pan(void) @@ -752,26 +751,22 @@ static inline bool system_uses_ttbr0_pan(void) static __always_inline bool system_supports_sve(void) { - return IS_ENABLED(CONFIG_ARM64_SVE) && - cpus_have_const_cap(ARM64_SVE); + return cpus_have_const_cap(ARM64_SVE); } static __always_inline bool system_supports_sme(void) { - return IS_ENABLED(CONFIG_ARM64_SME) && - cpus_have_const_cap(ARM64_SME); + return cpus_have_const_cap(ARM64_SME); } static __always_inline bool system_supports_sme2(void) { - return IS_ENABLED(CONFIG_ARM64_SME) && - cpus_have_const_cap(ARM64_SME2); + return cpus_have_const_cap(ARM64_SME2); } static __always_inline bool system_supports_fa64(void) { - return IS_ENABLED(CONFIG_ARM64_SME) && - cpus_have_const_cap(ARM64_SME_FA64); + return cpus_have_const_cap(ARM64_SME_FA64); } static __always_inline bool system_supports_tpidr2(void) @@ -781,20 +776,17 @@ static __always_inline bool system_supports_tpidr2(void) static __always_inline bool system_supports_cnp(void) { - return IS_ENABLED(CONFIG_ARM64_CNP) && - cpus_have_const_cap(ARM64_HAS_CNP); + return cpus_have_const_cap(ARM64_HAS_CNP); } static inline bool system_supports_address_auth(void) { - return IS_ENABLED(CONFIG_ARM64_PTR_AUTH) && - cpus_have_const_cap(ARM64_HAS_ADDRESS_AUTH); + return cpus_have_const_cap(ARM64_HAS_ADDRESS_AUTH); } static inline bool system_supports_generic_auth(void) { - return IS_ENABLED(CONFIG_ARM64_PTR_AUTH) && - cpus_have_const_cap(ARM64_HAS_GENERIC_AUTH); + return cpus_have_const_cap(ARM64_HAS_GENERIC_AUTH); } static inline bool system_has_full_ptr_auth(void) @@ -804,14 +796,12 @@ static inline bool system_has_full_ptr_auth(void) static __always_inline bool system_uses_irq_prio_masking(void) { - return IS_ENABLED(CONFIG_ARM64_PSEUDO_NMI) && - cpus_have_const_cap(ARM64_HAS_GIC_PRIO_MASKING); + return cpus_have_const_cap(ARM64_HAS_GIC_PRIO_MASKING); } static inline bool system_supports_mte(void) { - return IS_ENABLED(CONFIG_ARM64_MTE) && - cpus_have_const_cap(ARM64_MTE); + return cpus_have_const_cap(ARM64_MTE); } static inline bool system_has_prio_mask_debugging(void) @@ -822,13 +812,12 @@ static inline bool system_has_prio_mask_debugging(void) static inline bool system_supports_bti(void) { - return IS_ENABLED(CONFIG_ARM64_BTI) && cpus_have_const_cap(ARM64_BTI); + return cpus_have_const_cap(ARM64_BTI); } static inline bool system_supports_tlb_range(void) { - return IS_ENABLED(CONFIG_ARM64_TLB_RANGE) && - cpus_have_const_cap(ARM64_HAS_TLB_RANGE); + return cpus_have_const_cap(ARM64_HAS_TLB_RANGE); } int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt); |