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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>
This commit is contained in:
Ingo Molnar 2015-04-28 10:11:24 +02:00
parent ce4f5f9b65
commit 70d51eb65d
1 changed files with 3 additions and 11 deletions
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14
arch/x86/crypto/sha256_ssse3_glue.c
View File

@ -38,8 +38,6 @@
#include <crypto/sha.h> #include <crypto/sha.h>
#include <crypto/sha256_base.h> #include <crypto/sha256_base.h>
#include <asm/fpu/api.h> #include <asm/fpu/api.h>
#include <asm/xcr.h>
#include <asm/fpu/xstate.h>
#include <linux/string.h> #include <linux/string.h>
asmlinkage void sha256_transform_ssse3(u32 *digest, const char *data, asmlinkage void sha256_transform_ssse3(u32 *digest, const char *data,
@ -132,15 +130,9 @@ static struct shash_alg algs[] = { {
#ifdef CONFIG_AS_AVX #ifdef CONFIG_AS_AVX
static bool __init avx_usable(void) static bool __init avx_usable(void)
{ {
u64 xcr0; if (!cpu_has_xfeatures(XSTATE_SSE | XSTATE_YMM, NULL)) {
if (cpu_has_avx)
if (!cpu_has_avx || !cpu_has_osxsave) pr_info("AVX detected but unusable.\n");
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");
return false; return false;
} }