diff options
| author | Ingo Molnar <mingo@kernel.org> | 2015-04-28 10:11:24 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 15:47:57 +0200 |
| commit | 70d51eb65ddf53a00e6801c2ee541a7219e5685a (patch) | |
| tree | a8cf8ebbf48c772bbbbba7dab4c61d80065a478c /arch | |
| parent | ce4f5f9b65ae3d630e375b5e406feca31f682886 (diff) | |
x86/fpu, crypto x86/sha256_ssse3: Simplify the sha256_ssse3_mod_init() xfeature checks
Use the new 'cpu_has_xfeatures()' function to query AVX CPU support.
This has the following advantages to the driver:
- Decouples the driver from FPU internals: it's now only using <asm/fpu/api.h>.
- Removes detection complexity from the driver, no more raw XGETBV instruction
- Shrinks the code a bit.
- Standardizes feature name error message printouts across drivers
There are also advantages to the x86 FPU code: once all drivers
are decoupled from internals we can move them out of common
headers and we'll also be able to remove xcr.h.
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/crypto/sha256_ssse3_glue.c | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/arch/x86/crypto/sha256_ssse3_glue.c b/arch/x86/crypto/sha256_ssse3_glue.c index eb65522f02b8..f8097fc0d1d1 100644 --- a/arch/x86/crypto/sha256_ssse3_glue.c +++ b/arch/x86/crypto/sha256_ssse3_glue.c @@ -38,8 +38,6 @@ #include <crypto/sha.h> #include <crypto/sha256_base.h> #include <asm/fpu/api.h> -#include <asm/xcr.h> -#include <asm/fpu/xstate.h> #include <linux/string.h> asmlinkage void sha256_transform_ssse3(u32 *digest, const char *data, @@ -132,15 +130,9 @@ static struct shash_alg algs[] = { { #ifdef CONFIG_AS_AVX static bool __init avx_usable(void) { - u64 xcr0; - - if (!cpu_has_avx || !cpu_has_osxsave) - return false; - - xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); - if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) { - pr_info("AVX detected but unusable.\n"); - + if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL)) { + if (cpu_has_avx) + pr_info("AVX detected but unusable.\n"); return false; } |