Discussion:
[PATCH] x86: Add Hygon Dhyana support.
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fanjinke
2018-12-10 10:26:09 UTC
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This patch fix Hygon Dhyana processor CPU Vendor ID detection problem
in glibc sysdep module, current glibc codes doesn't recognize Dhyana
CPU Vendor ID("HygonGenuine") and set kind to arch_kind_other, which
result to incorrect zero value for __cache_sysconf() syscall. As Hygon
Dhyana share most architecture feature as AMD Family 17h, this patch
add Hygon CPU Vendor ID check and setup kind to arch_kind_amd and reuse
AMD code path, which lead to correct return value in __cache_sysconf()
syscall. we run the glibc test suite for both Hygon Dhyana and AMD EPYC
and found no failure case.

Background:
Chengdu Haiguang IC Design Co., Ltd (Hygon) is a Joint Venture between
AMD and Haiguang Information Technology Co.,Ltd., aims at providing high
performance x86 processor for China server market. Its first generation
processor codename is Dhyana, which originates from AMD technology and
shares most of the architecture with AMD's family 17h, but with different
CPU Vendor ID("HygonGenuine")/Family series number(Family 18h).

Related Hygon kernel patch can be found on
http://lkml.kernel.org/r/5ce86123a7b9dad925ac583d88d2f921040e859b.
***@hygon.cn

Very appreciate everyone who has helped review and fix issues.

*Tested for Hygon:*
Before patching the results of hygon's tests:
Summary of test results:
6 FAIL
5927 PASS
29 UNSUPPORTED
17 XFAIL
2 XPASS
Makefile:403: recipe for target 'tests' failed
make[1]: *** [tests] Error 1
make[1]: Leaving directory
'/home/higon/space/src/opensrc/glibc/glibc/glibc'
Makefile:9: recipe for target 'check' failed
make: *** [check] Error 2

And the result of testing after patching:
Summary of test results:
5945 PASS
17 UNSUPPORTED
17 XFAIL
2 XPASS
make[1]: Leaving directory
'/home/higon/space/src/opensrc/glibc/glibc/glibc'

*Tested for AMD:*
The test results did not change before and after patching:
Summary of test results:
5951 PASS
11 UNSUPPORTED
17 XFAIL
2 XPASS
make[1]: Leaving directory '/home/higon/glibc'

ChangeLog:

2018-12-10 fanjinke <***@hygon.cn>

* sysdeps/x86/cpu-features.c (init_cpu_features):
---
sysdeps/x86/cpu-features.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index 5f9eefd408..86e78bfb78 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -425,8 +425,9 @@ init_cpu_features (struct cpu_features *cpu_features)
cpu_features->feature[index_arch_Prefer_No_AVX512]
|= bit_arch_Prefer_No_AVX512;
}
- /* This spells out "AuthenticAMD". */
- else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
+ /* This spells out "AuthenticAMD" or "HygonGenuine". */
+ else if ((ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
+ || (ebx == 0x6f677948 && ecx == 0x656e6975 && edx == 0x6e65476e))
{
unsigned int extended_model;
--
2.17.1
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