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| author | Ingo Molnar <mingo@kernel.org> | 2015-04-28 11:11:24 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-05-19 16:47:58 +0300 |
| commit | d5d34d98d2df01766854c7eb7044943b596d824f (patch) | |
| tree | ab23db213c224e19a3091b3ed2c0c556dca7388e /arch/x86/crypto | |
| parent | c1c23f7e5e1ef5e72c21f0615fbed560be5b8fa9 (diff) | |
| download | linux-d5d34d98d2df01766854c7eb7044943b596d824f.tar.xz | |
x86/fpu, crypto x86/cast5_avx: Simplify the cast5_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/x86/crypto')
| -rw-r--r-- | arch/x86/crypto/cast5_avx_glue.c | 15 |
1 files changed, 4 insertions, 11 deletions
diff --git a/arch/x86/crypto/cast5_avx_glue.c b/arch/x86/crypto/cast5_avx_glue.c index ca4f32e7a423..be00aa48b2b5 100644 --- a/arch/x86/crypto/cast5_avx_glue.c +++ b/arch/x86/crypto/cast5_avx_glue.c @@ -31,8 +31,7 @@ #include <crypto/cast5.h> #include <crypto/cryptd.h> #include <crypto/ctr.h> -#include <asm/xcr.h> -#include <asm/fpu/xstate.h> +#include <asm/fpu/api.h> #include <asm/crypto/glue_helper.h> #define CAST5_PARALLEL_BLOCKS 16 @@ -468,16 +467,10 @@ static struct crypto_alg cast5_algs[6] = { { static int __init cast5_init(void) { - u64 xcr0; + const char *feature_name; - if (!cpu_has_avx || !cpu_has_osxsave) { - pr_info("AVX instructions are not detected.\n"); - return -ENODEV; - } - - 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, &feature_name)) { + pr_info("CPU feature '%s' is not supported.\n", feature_name); return -ENODEV; } |