From 6ca5afb8c26991cf4f13a8bcca870ec2a9522bf7 Mon Sep 17 00:00:00 2001 From: Mathias Krause Date: Mon, 24 Mar 2014 17:10:37 +0100 Subject: [PATCH] crypto: x86/sha1 - re-enable the AVX variant Commit 7c1da8d0d0 "crypto: sha - SHA1 transform x86_64 AVX2" accidentally disabled the AVX variant by making the avx_usable() test not only fail in case the CPU doesn't support AVX or OSXSAVE but also if it doesn't support AVX2. Fix that regression by splitting up the AVX/AVX2 test into two functions. Also test for the BMI1 extension in the avx2_usable() test as the AVX2 implementation not only makes use of BMI2 but also BMI1 instructions. Cc: Chandramouli Narayanan Signed-off-by: Mathias Krause Reviewed-by: H. Peter Anvin Reviewed-by: Marek Vasut Signed-off-by: Herbert Xu --- arch/x86/crypto/sha1_ssse3_glue.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) diff --git a/arch/x86/crypto/sha1_ssse3_glue.c b/arch/x86/crypto/sha1_ssse3_glue.c index 139a55c04d82..74d16ef707c7 100644 --- a/arch/x86/crypto/sha1_ssse3_glue.c +++ b/arch/x86/crypto/sha1_ssse3_glue.c @@ -208,11 +208,7 @@ static bool __init avx_usable(void) { u64 xcr0; -#if defined(CONFIG_AS_AVX2) - if (!cpu_has_avx || !cpu_has_avx2 || !cpu_has_osxsave) -#else if (!cpu_has_avx || !cpu_has_osxsave) -#endif return false; xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); @@ -224,11 +220,23 @@ static bool __init avx_usable(void) return true; } + +#ifdef CONFIG_AS_AVX2 +static bool __init avx2_usable(void) +{ + if (avx_usable() && cpu_has_avx2 && boot_cpu_has(X86_FEATURE_BMI1) && + boot_cpu_has(X86_FEATURE_BMI2)) + return true; + + return false; +} +#endif #endif static int __init sha1_ssse3_mod_init(void) { char *algo_name; + /* test for SSSE3 first */ if (cpu_has_ssse3) { sha1_transform_asm = sha1_transform_ssse3; @@ -238,13 +246,11 @@ static int __init sha1_ssse3_mod_init(void) #ifdef CONFIG_AS_AVX /* allow AVX to override SSSE3, it's a little faster */ if (avx_usable()) { - if (cpu_has_avx) { - sha1_transform_asm = sha1_transform_avx; - algo_name = "AVX"; - } + sha1_transform_asm = sha1_transform_avx; + algo_name = "AVX"; #ifdef CONFIG_AS_AVX2 - if (cpu_has_avx2 && boot_cpu_has(X86_FEATURE_BMI2)) { - /* allow AVX2 to override AVX, it's a little faster */ + /* allow AVX2 to override AVX, it's a little faster */ + if (avx2_usable()) { sha1_transform_asm = sha1_apply_transform_avx2; algo_name = "AVX2"; }