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. This case expect to use crc32c-generic driver for
some Zhaoxin CPUs to get performance gain, So remove these Zhaoxin
CPUs support from crc32c-intel.
Signed-off-by: Tony W Wang-oc <TonyWWang-oc@xxxxxxxxxxx>
---
arch/x86/crypto/crc32c-intel_glue.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/x86/crypto/crc32c-intel_glue.c b/arch/x86/crypto/crc32c-intel_glue.c
index feccb52..6dafdae 100644
--- a/arch/x86/crypto/crc32c-intel_glue.c
+++ b/arch/x86/crypto/crc32c-intel_glue.c
@@ -222,8 +222,16 @@ 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) {
+ if (c->x86 == 0x6 || (c->x86 == 0x7 && c->x86_model <= 0x3b))
+ return -ENODEV;
+ }
+
#ifdef CONFIG_X86_64
if (boot_cpu_has(X86_FEATURE_PCLMULQDQ)) {
alg.update = crc32c_pcl_intel_update;
--
2.7.4
