From d1e509660c690597edb7e15efd22a5e78b8e2fd5 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@kernel.org>
Date: Tue, 28 Apr 2015 10:11:24 +0200
Subject: [PATCH] x86/fpu, crypto x86/sha1_ssse3: Simplify the
sha1_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>
---
arch/x86/crypto/sha1_ssse3_glue.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)
diff --git a/arch/x86/crypto/sha1_ssse3_glue.c b/arch/x86/crypto/sha1_ssse3_glue.c
index 84db12f052e84..7c48e8b20848e 100644
--- a/arch/x86/crypto/sha1_ssse3_glue.c
+++ b/arch/x86/crypto/sha1_ssse3_glue.c
@@ -30,8 +30,6 @@
#include <crypto/sha.h>
#include <crypto/sha1_base.h>
#include <asm/fpu/api.h>
-#include <asm/xcr.h>
-#include <asm/fpu/xstate.h>
asmlinkage void sha1_transform_ssse3(u32 *digest, const char *data,
@@ -123,15 +121,9 @@ static struct shash_alg alg = {
#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;
}
--
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