The branch main has been updated by kib:
URL:
https://cgit.FreeBSD.org/src/commit/?id=523d94dbeab5ccb1cce21b8cad350b700c3d01b2
commit 523d94dbeab5ccb1cce21b8cad350b700c3d01b2
Author: Konstantin Belousov <k...@freebsd.org>
AuthorDate: 2021-01-21 12:54:28 +0000
Commit: Konstantin Belousov <k...@freebsd.org>
CommitDate: 2021-01-21 12:55:31 +0000
x86: switch vdso TSC timecounter to RDTSCP on AMD Zen CPUs
Reported by: many
Tested by: gallatin, mikael, rhurlin
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
---
lib/libc/x86/sys/__vdso_gettc.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/lib/libc/x86/sys/__vdso_gettc.c b/lib/libc/x86/sys/__vdso_gettc.c
index 7f224f8758cb..7a64f2a0b556 100644
--- a/lib/libc/x86/sys/__vdso_gettc.c
+++ b/lib/libc/x86/sys/__vdso_gettc.c
@@ -125,7 +125,7 @@ struct tsc_selector_tag {
};
static const struct tsc_selector_tag tsc_selector[] = {
- [0] = { /* Intel or AMD Zen+, LFENCE */
+ [0] = { /* Intel, LFENCE */
.ts_rdtsc32 = rdtsc32_mb_lfence,
.ts_rdtsc_low = rdtsc_low_mb_lfence,
},
@@ -164,9 +164,6 @@ tsc_selector_idx(u_int cpu_feature)
do_cpuid(1, p);
cpu_id = p[0];
- if (amd_cpu && CPUID_TO_FAMILY(cpu_id) >= 0x17)
- return (0);
-
if (cpu_feature != 0) {
do_cpuid(0x80000000, p);
cpu_exthigh = p[0];
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