linux-kernel - [PATCH v1 3/3] crypto: x86/crc32c-intel Exclude low performance CRC32C instruction CPUs

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Date:   Thu, 7 Jan 2021 14:19:08 +0800
From:   Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <x86@...nel.org>, <hpa@...or.com>, <tony.luck@...el.com>,
        <dave.hansen@...el.com>, <seanjc@...gle.com>,
        <fenghua.yu@...el.com>, <thomas.lendacky@....com>,
        <kyung.min.park@...el.com>, <kim.phillips@....com>,
        <mgross@...ux.intel.com>, <peterz@...radead.org>,
        <krish.sadhukhan@...cle.com>, <liam.merwick@...cle.com>,
        <mlevitsk@...hat.com>, <reinette.chatre@...el.com>,
        <babu.moger@....com>, <linux-crypto@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <TimGuo-oc@...oxin.com>, <CooperYan@...oxin.com>,
        <QiyuanWang@...oxin.com>, <HerryYang@...oxin.com>,
        <CobeChen@...oxin.com>, <SilviaZhao@...oxin.com>
Subject: [PATCH v1 3/3] crypto: x86/crc32c-intel Exclude low performance CRC32C instruction CPUs

Low performance CRC32C instruction CPUs expect to use the driver
crc32c-generic. So remove these CPUs support from crc32c-intel.

Signed-off-by: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
---
 arch/x86/crypto/crc32c-intel_glue.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/crypto/crc32c-intel_glue.c b/arch/x86/crypto/crc32c-intel_glue.c
index feccb52..1b6d289 100644
--- a/arch/x86/crypto/crc32c-intel_glue.c
+++ b/arch/x86/crypto/crc32c-intel_glue.c
@@ -224,6 +224,11 @@ static int __init crc32c_intel_mod_init(void)
 {
 	if (!x86_match_cpu(crc32c_cpu_id))
 		return -ENODEV;
+
+	/* Don't merit use low performance CRC32C instruction */
+	if (boot_cpu_has(X86_FEATURE_CRC32C))
+		return -ENODEV;
+
 #ifdef CONFIG_X86_64
 	if (boot_cpu_has(X86_FEATURE_PCLMULQDQ)) {
 		alg.update = crc32c_pcl_intel_update;
-- 
2.7.4