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Message-Id: <20250724-vdso-sparc64-generic-2-v1-14-e376a3bd24d1@linutronix.de>
Date: Thu, 24 Jul 2025 08:27:04 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Arnd Bergmann <arnd@...db.de>, Shuah Khan <shuah@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Andreas Larsson <andreas@...sler.com>,
Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>,
Shannon Nelson <shannon.nelson@....com>,
Nick Alcock <nick.alcock@...cle.com>, John Stultz <jstultz@...gle.com>,
Stephen Boyd <sboyd@...nel.org>,
John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
sparclinux@...r.kernel.org,
Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH RFC 14/14] sparc64: vdso: Implement clock_getres()
Add a vDSO fastpath for clock_getres().
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
arch/sparc/include/asm/vdso/gettimeofday.h | 42 +++++++++++++++++++++++++++++-
arch/sparc/vdso/vclock_gettime.c | 16 ++++++++++++
arch/sparc/vdso/vdso.lds.S | 2 ++
arch/sparc/vdso/vdso32/vdso32.lds.S | 2 ++
4 files changed, 61 insertions(+), 1 deletion(-)
diff --git a/arch/sparc/include/asm/vdso/gettimeofday.h b/arch/sparc/include/asm/vdso/gettimeofday.h
index a35875fba45470ba961a7df3ae52bc17d2a4a4a0..ccd2bda0a0c42ec826eb0464b7a41f98b4cea993 100644
--- a/arch/sparc/include/asm/vdso/gettimeofday.h
+++ b/arch/sparc/include/asm/vdso/gettimeofday.h
@@ -16,6 +16,8 @@
#include <linux/types.h>
+#define VDSO_HAS_CLOCK_GETRES 1
+
#ifdef CONFIG_SPARC64
static __always_inline u64 vread_tick(void)
{
@@ -125,7 +127,45 @@ long clock_gettime32_fallback(clockid_t clock, struct old_timespec32 *ts)
"0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
return o0;
}
-#endif
+
+static __always_inline
+long clock_getres_fallback(clockid_t clock, struct __kernel_timespec *ts)
+{
+ register long num __asm__("g1") = __NR_clock_getres_time64;
+ register long o0 __asm__("o0") = clock;
+ register long o1 __asm__("o1") = (long) ts;
+
+ __asm__ __volatile__(SYSCALL_STRING : "=r" (o0) : "r" (num),
+ "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
+ return o0;
+}
+
+static __always_inline
+long clock_getres32_fallback(clockid_t clock, struct old_timespec32 *ts)
+{
+ register long num __asm__("g1") = __NR_clock_getres;
+ register long o0 __asm__("o0") = clock;
+ register long o1 __asm__("o1") = (long) ts;
+
+ __asm__ __volatile__(SYSCALL_STRING : "=r" (o0) : "r" (num),
+ "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
+ return o0;
+}
+#else /* !CONFIG_SPARC64 */
+
+static __always_inline
+long clock_getres_fallback(clockid_t clock, struct __kernel_timespec *ts)
+{
+ register long num __asm__("g1") = __NR_clock_getres;
+ register long o0 __asm__("o0") = clock;
+ register long o1 __asm__("o1") = (long) ts;
+
+ __asm__ __volatile__(SYSCALL_STRING : "=r" (o0) : "r" (num),
+ "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
+ return o0;
+}
+
+#endif /* CONFIG_SPARC64 */
static __always_inline
long gettimeofday_fallback(struct __kernel_old_timeval *tv, struct timezone *tz)
diff --git a/arch/sparc/vdso/vclock_gettime.c b/arch/sparc/vdso/vclock_gettime.c
index 1d9859392e4cfd285349cf9155ca1fc25d3a7b41..3cadf94e6cee5392586755e97f629092d4bcab1e 100644
--- a/arch/sparc/vdso/vclock_gettime.c
+++ b/arch/sparc/vdso/vclock_gettime.c
@@ -38,6 +38,14 @@ int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
int clock_gettime(clockid_t, struct __kernel_timespec *)
__weak __alias(__vdso_clock_gettime);
+int __vdso_clock_getres(clockid_t clock, struct __kernel_timespec *res)
+{
+ return __cvdso_clock_getres(clock, res);
+}
+
+int clock_getres(clockid_t, struct __kernel_timespec *)
+ __weak __alias(__vdso_clock_getres);
+
#else
int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts)
@@ -56,4 +64,12 @@ int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts)
int clock_gettime64(clockid_t, struct __kernel_timespec *)
__weak __alias(__vdso_clock_gettime64);
+int __vdso_clock_getres(clockid_t clock, struct old_timespec32 *res)
+{
+ return __cvdso_clock_getres_time32(clock, res);
+}
+
+int clock_getres(clockid_t, struct old_timespec32 *)
+ __weak __alias(__vdso_clock_getres);
+
#endif
diff --git a/arch/sparc/vdso/vdso.lds.S b/arch/sparc/vdso/vdso.lds.S
index f3caa29a331c58175b67ea60d7ac15cd467fe5ff..67c64a3adfa94f61356ce11081df442c18d6d8d5 100644
--- a/arch/sparc/vdso/vdso.lds.S
+++ b/arch/sparc/vdso/vdso.lds.S
@@ -20,6 +20,8 @@ VERSION {
__vdso_clock_gettime;
gettimeofday;
__vdso_gettimeofday;
+ clock_getres;
+ __vdso_clock_getres;
local: *;
};
}
diff --git a/arch/sparc/vdso/vdso32/vdso32.lds.S b/arch/sparc/vdso/vdso32/vdso32.lds.S
index a14e4f77e6f2222b855df27cc7a0d0a4f98bd4ac..d09b1893ee1411f450df935335e6fe8d8c8b2632 100644
--- a/arch/sparc/vdso/vdso32/vdso32.lds.S
+++ b/arch/sparc/vdso/vdso32/vdso32.lds.S
@@ -21,6 +21,8 @@ VERSION {
__vdso_clock_gettime64;
gettimeofday;
__vdso_gettimeofday;
+ clock_getres;
+ __vdso_clock_getres;
local: *;
};
}
--
2.50.1
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