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authorIngo Molnar <mingo@kernel.org>2015-04-28 10:11:24 +0200
committerIngo Molnar <mingo@kernel.org>2015-05-19 15:47:57 +0200
commit4eecd2616d6a6e91b57659281ca6bf243264f8db (patch)
treee8886dd5771056ff9961418df2f1bfc4423743a4 /arch/x86/crypto/twofish_avx_glue.c
parent7bc371faa9cd661589d13575cd48aa168e04e208 (diff)
downloadop-kernel-dev-4eecd2616d6a6e91b57659281ca6bf243264f8db.zip
op-kernel-dev-4eecd2616d6a6e91b57659281ca6bf243264f8db.tar.gz
x86/fpu, crypto x86/twofish_avx: Simplify the twofish_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/twofish_avx_glue.c')
-rw-r--r--arch/x86/crypto/twofish_avx_glue.c14
1 files changed, 3 insertions, 11 deletions
diff --git a/arch/x86/crypto/twofish_avx_glue.c b/arch/x86/crypto/twofish_avx_glue.c
index 95434f5..c2bd0ce 100644
--- a/arch/x86/crypto/twofish_avx_glue.c
+++ b/arch/x86/crypto/twofish_avx_glue.c
@@ -37,8 +37,6 @@
#include <crypto/lrw.h>
#include <crypto/xts.h>
#include <asm/fpu/api.h>
-#include <asm/xcr.h>
-#include <asm/fpu/xstate.h>
#include <asm/crypto/twofish.h>
#include <asm/crypto/glue_helper.h>
#include <crypto/scatterwalk.h>
@@ -558,16 +556,10 @@ static struct crypto_alg twofish_algs[10] = { {
static int __init twofish_init(void)
{
- u64 xcr0;
+ const char *feature_name;
- if (!cpu_has_avx || !cpu_has_osxsave) {
- printk(KERN_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)) {
- printk(KERN_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;
}
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