Unverified Commit 7367f183 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
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!3164 [OLK-6.6] Fix CRC32C instruction low performance issue 

Merge Pull Request from: @leoliu-oc 
 
The driver crc32c-intel match CPUs supporting X86_FEATURE_XMM4_2. On platforms with Zhaoxin CPUs supporting this X86 feature, when crc32c-intel and crc32c-generic are both registered, system will use crc32c-intel because its .cra_priority is greater than crc32c-generic.
When doing lmbench3 Create and Delete file test on partitions with ext4 enabling metadata checksum, found using crc32c-generic driver could get about 20% performance gain than using the driver crc32c-intel on some Zhaoxin CPUs.
This case expect to use crc32c-generic driver for these Zhaoxin CPUs to get performance gain, so remove these Zhaoxin CPUs support from crc32c-intel.

### Issue
https://gitee.com/openeuler/kernel/issues/I8WY9W

### Test
Pass: The driver loading of each model of Zhaoxin processor meets expectations 
 
Link:https://gitee.com/openeuler/kernel/pulls/3164

 

Reviewed-by: default avatarJason Zeng <jason.zeng@intel.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parents a3cf1794 14af64e1

arch/x86/crypto/crc32c-intel_glue.c

+7 −0
Original line number Diff line number Diff line
@@ -222,8 +222,15 @@ MODULE_DEVICE_TABLE(x86cpu, crc32c_cpu_id); 


static int __init crc32c_intel_mod_init(void)

{

	struct cpuinfo_x86 *c = &boot_cpu_data;



	if (!x86_match_cpu(crc32c_cpu_id))

		return -ENODEV;



	if ((c->x86_vendor == X86_VENDOR_ZHAOXIN || c->x86_vendor == X86_VENDOR_CENTAUR) &&

		(c->x86 <= 7 && c->x86_model <= 59))

		return -ENODEV;



#ifdef CONFIG_X86_64

	if (boot_cpu_has(X86_FEATURE_PCLMULQDQ)) {

		alg.update = crc32c_pcl_intel_update;