From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
arnd@arndb.de, tglx@linutronix.de, vincenzo.frascino@arm.com,
luto@kernel.org
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org,
x86@kernel.org
Subject: [RFC PATCH v2 04/10] lib: vdso: get pointer to vdso data from the arch
Date: Mon, 23 Dec 2019 14:31:05 +0000 (UTC) [thread overview]
Message-ID: <02861d0a05c2d48db4e9ee9093e2e2598093c372.1577111366.git.christophe.leroy@c-s.fr> (raw)
In-Reply-To: <cover.1577111363.git.christophe.leroy@c-s.fr>
On powerpc, __arch_get_vdso_data() clobbers the link register,
requiring the caller to set a stack frame in order to save it.
As the parent function already has to set a stack frame and save
the link register to call the C vdso function, retriving the
vdso data pointer there is lighter.
Give arches the opportunity to hand the vdso data pointer
to C vdso functions.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/arm/vdso/vgettimeofday.c | 12 ++++++++----
arch/arm64/kernel/vdso/vgettimeofday.c | 9 ++++++---
arch/arm64/kernel/vdso32/vgettimeofday.c | 12 ++++++++----
arch/mips/vdso/vgettimeofday.c | 21 ++++++++++++++-------
arch/x86/entry/vdso/vclock_gettime.c | 22 +++++++++++++++-------
lib/vdso/gettimeofday.c | 28 ++++++++++++++--------------
6 files changed, 65 insertions(+), 39 deletions(-)
diff --git a/arch/arm/vdso/vgettimeofday.c b/arch/arm/vdso/vgettimeofday.c
index 5451afb715e6..efad7d508d06 100644
--- a/arch/arm/vdso/vgettimeofday.c
+++ b/arch/arm/vdso/vgettimeofday.c
@@ -10,7 +10,8 @@
int __vdso_clock_gettime(clockid_t clock,
struct old_timespec32 *ts)
{
- int ret = __cvdso_clock_gettime32(clock, ts);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_gettime32(vd, clock, ts);
if (likely(!ret))
return ret;
@@ -21,7 +22,8 @@ int __vdso_clock_gettime(clockid_t clock,
int __vdso_clock_gettime64(clockid_t clock,
struct __kernel_timespec *ts)
{
- int ret = __cvdso_clock_gettime(clock, ts);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_gettime(vd, clock, ts);
if (likely(!ret))
return ret;
@@ -32,7 +34,8 @@ int __vdso_clock_gettime64(clockid_t clock,
int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
struct timezone *tz)
{
- int ret = __cvdso_gettimeofday(tv, tz);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_gettimeofday(vd, tv, tz);
if (likely(!ret))
return ret;
@@ -43,7 +46,8 @@ int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
int __vdso_clock_getres(clockid_t clock_id,
struct old_timespec32 *res)
{
- int ret = __cvdso_clock_getres_time32(clock_id, res);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_getres_time32(vd, clock_id, res);
if (likely(!ret))
return ret;
diff --git a/arch/arm64/kernel/vdso/vgettimeofday.c b/arch/arm64/kernel/vdso/vgettimeofday.c
index 62694876b216..9a7122ec6d17 100644
--- a/arch/arm64/kernel/vdso/vgettimeofday.c
+++ b/arch/arm64/kernel/vdso/vgettimeofday.c
@@ -11,7 +11,8 @@
int __kernel_clock_gettime(clockid_t clock,
struct __kernel_timespec *ts)
{
- int ret = __cvdso_clock_gettime(clock, ts);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_gettime(vd, clock, ts);
if (likely(!ret))
return ret;
@@ -22,7 +23,8 @@ int __kernel_clock_gettime(clockid_t clock,
int __kernel_gettimeofday(struct __kernel_old_timeval *tv,
struct timezone *tz)
{
- int ret = __cvdso_gettimeofday(tv, tz);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_gettimeofday(vd, tv, tz);
if (likely(!ret))
return ret;
@@ -33,7 +35,8 @@ int __kernel_gettimeofday(struct __kernel_old_timeval *tv,
int __kernel_clock_getres(clockid_t clock_id,
struct __kernel_timespec *res)
{
- int ret = __cvdso_clock_getres(clock_id, res);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_getres(vd, clock_id, res);
if (likely(!ret))
return ret;
diff --git a/arch/arm64/kernel/vdso32/vgettimeofday.c b/arch/arm64/kernel/vdso32/vgettimeofday.c
index 6770d2bedd1f..3eb6a82c1c25 100644
--- a/arch/arm64/kernel/vdso32/vgettimeofday.c
+++ b/arch/arm64/kernel/vdso32/vgettimeofday.c
@@ -11,13 +11,14 @@
int __vdso_clock_gettime(clockid_t clock,
struct old_timespec32 *ts)
{
+ const struct vdso_data *vd = __arch_get_vdso_data();
int ret;
/* The checks below are required for ABI consistency with arm */
if ((u32)ts >= TASK_SIZE_32)
return -EFAULT;
- ret = __cvdso_clock_gettime32(clock, ts);
+ ret = __cvdso_clock_gettime32(vd, clock, ts);
if (likely(!ret))
return ret;
@@ -28,13 +29,14 @@ int __vdso_clock_gettime(clockid_t clock,
int __vdso_clock_gettime64(clockid_t clock,
struct __kernel_timespec *ts)
{
+ const struct vdso_data *vd = __arch_get_vdso_data();
int ret;
/* The checks below are required for ABI consistency with arm */
if ((u32)ts >= TASK_SIZE_32)
return -EFAULT;
- ret = __cvdso_clock_gettime(clock, ts);
+ ret = __cvdso_clock_gettime(vd, clock, ts);
if (likely(!ret))
return ret;
@@ -45,7 +47,8 @@ int __vdso_clock_gettime64(clockid_t clock,
int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
struct timezone *tz)
{
- int ret = __cvdso_gettimeofday(tv, tz);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_gettimeofday(vd, tv, tz);
if (likely(!ret))
return ret;
@@ -56,6 +59,7 @@ int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
int __vdso_clock_getres(clockid_t clock_id,
struct old_timespec32 *res)
{
+ const struct vdso_data *vd = __arch_get_vdso_data();
int ret;
struct __kernel_timespec ts;
@@ -63,7 +67,7 @@ int __vdso_clock_getres(clockid_t clock_id,
if ((u32)res >= TASK_SIZE_32)
return -EFAULT;
- ret = __cvdso_clock_getres_time32(clock_id, res);
+ ret = __cvdso_clock_getres_time32(vd, clock_id, res);
if (likely(!ret))
return ret;
diff --git a/arch/mips/vdso/vgettimeofday.c b/arch/mips/vdso/vgettimeofday.c
index 02758c58454c..65d79d4695da 100644
--- a/arch/mips/vdso/vgettimeofday.c
+++ b/arch/mips/vdso/vgettimeofday.c
@@ -14,7 +14,8 @@
int __vdso_clock_gettime(clockid_t clock,
struct old_timespec32 *ts)
{
- int ret = __cvdso_clock_gettime32(clock, ts);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_gettime32(vd, clock, ts);
if (likely(!ret))
return ret;
@@ -25,7 +26,8 @@ int __vdso_clock_gettime(clockid_t clock,
int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
struct timezone *tz)
{
- int ret = __cvdso_gettimeofday(tv, tz);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_gettimeofday(vd, tv, tz);
if (likely(!ret))
return ret;
@@ -36,7 +38,8 @@ int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
int __vdso_clock_getres(clockid_t clock_id,
struct old_timespec32 *res)
{
- int ret = __cvdso_clock_getres_time32(clock_id, res);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_getres_time32(vd, clock_id, res);
if (likely(!ret))
return ret;
@@ -47,7 +50,8 @@ int __vdso_clock_getres(clockid_t clock_id,
int __vdso_clock_gettime64(clockid_t clock,
struct __kernel_timespec *ts)
{
- int ret = __cvdso_clock_gettime(clock, ts);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_gettime(vd, clock, ts);
if (likely(!ret))
return ret;
@@ -60,7 +64,8 @@ int __vdso_clock_gettime64(clockid_t clock,
int __vdso_clock_gettime(clockid_t clock,
struct __kernel_timespec *ts)
{
- int ret = __cvdso_clock_gettime(clock, ts);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_gettime(vd, clock, ts);
if (likely(!ret))
return ret;
@@ -71,7 +76,8 @@ int __vdso_clock_gettime(clockid_t clock,
int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
struct timezone *tz)
{
- int ret = __cvdso_gettimeofday(tv, tz);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_gettimeofday(vd, tv, tz);
if (likely(!ret))
return ret;
@@ -82,7 +88,8 @@ int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
int __vdso_clock_getres(clockid_t clock_id,
struct __kernel_timespec *res)
{
- int ret = __cvdso_clock_getres(clock_id, res);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_getres(vd, clock_id, res);
if (likely(!ret))
return ret;
diff --git a/arch/x86/entry/vdso/vclock_gettime.c b/arch/x86/entry/vdso/vclock_gettime.c
index fde511cfe284..b87847b660dd 100644
--- a/arch/x86/entry/vdso/vclock_gettime.c
+++ b/arch/x86/entry/vdso/vclock_gettime.c
@@ -19,7 +19,8 @@ extern __kernel_old_time_t __vdso_time(__kernel_old_time_t *t);
int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
{
- int ret = __cvdso_gettimeofday(tv, tz);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_gettimeofday(vd, tv, tz);
if (likely(!ret))
return ret;
@@ -32,7 +33,9 @@ int gettimeofday(struct __kernel_old_timeval *, struct timezone *)
__kernel_old_time_t __vdso_time(__kernel_old_time_t *t)
{
- return __cvdso_time(t);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+
+ return __cvdso_time(vd, t);
}
__kernel_old_time_t time(__kernel_old_time_t *t) __attribute__((weak, alias("__vdso_time")));
@@ -45,7 +48,8 @@ extern int __vdso_clock_getres(clockid_t clock, struct __kernel_timespec *res);
int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
{
- int ret = __cvdso_clock_gettime(clock, ts);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_gettime(vd, clock, ts);
if (likely(!ret))
return ret;
@@ -59,7 +63,8 @@ int clock_gettime(clockid_t, struct __kernel_timespec *)
int __vdso_clock_getres(clockid_t clock,
struct __kernel_timespec *res)
{
- int ret = __cvdso_clock_getres(clock_id, res);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_getres(vd, clock_id, res);
if (likely(!ret))
return ret;
@@ -76,7 +81,8 @@ extern int __vdso_clock_getres(clockid_t clock, struct old_timespec32 *res);
int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts)
{
- int ret = __cvdso_clock_gettime32(clock, ts);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_gettime32(vd, clock, ts);
if (likely(!ret))
return ret;
@@ -89,7 +95,8 @@ int clock_gettime(clockid_t, struct old_timespec32 *)
int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts)
{
- int ret = __cvdso_clock_gettime(clock, ts);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_gettime(vd, clock, ts);
if (likely(!ret))
return ret;
@@ -102,7 +109,8 @@ int clock_gettime64(clockid_t, struct __kernel_timespec *)
int __vdso_clock_getres(clockid_t clock, struct old_timespec32 *res)
{
- int ret = __cvdso_clock_getres_time32(clock, res);
+ const struct vdso_data *vd = __arch_get_vdso_data();
+ int ret = __cvdso_clock_getres_time32(vd, clock, res);
if (likely(!ret))
return ret;
diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c
index c6eeeb47f446..24e1ba838260 100644
--- a/lib/vdso/gettimeofday.c
+++ b/lib/vdso/gettimeofday.c
@@ -13,7 +13,6 @@
/*
* The generic vDSO implementation requires that gettimeofday.h
* provides:
- * - __arch_get_vdso_data(): to get the vdso datapage.
* - __arch_get_hw_counter(): to get the hw counter based on the
* clock_mode.
*/
@@ -79,9 +78,9 @@ static void do_coarse(const struct vdso_data *vd, clockid_t clk,
}
static __maybe_unused int
-__cvdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
+__cvdso_clock_gettime(const struct vdso_data *vd, clockid_t clock,
+ struct __kernel_timespec *ts)
{
- const struct vdso_data *vd = __arch_get_vdso_data();
u32 msk;
/* Check for negative values or invalid clocks */
@@ -105,10 +104,11 @@ __cvdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
}
static __maybe_unused int
-__cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res)
+__cvdso_clock_gettime32(const struct vdso_data *vd, clockid_t clock,
+ struct old_timespec32 *res)
{
struct __kernel_timespec ts;
- int ret = __cvdso_clock_gettime(clock, &ts);
+ int ret = __cvdso_clock_gettime(vd, clock, &ts);
if (likely(!ret)) {
res->tv_sec = ts.tv_sec;
@@ -118,10 +118,9 @@ __cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res)
}
static __maybe_unused int
-__cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
+__cvdso_gettimeofday(const struct vdso_data *vd, struct __kernel_old_timeval *tv,
+ struct timezone *tz)
{
- const struct vdso_data *vd = __arch_get_vdso_data();
-
if (likely(tv != NULL)) {
struct __kernel_timespec ts;
@@ -141,9 +140,9 @@ __cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
}
#ifdef VDSO_HAS_TIME
-static __maybe_unused __kernel_old_time_t __cvdso_time(__kernel_old_time_t *time)
+static __maybe_unused __kernel_old_time_t
+__cvdso_time(const struct vdso_data *vd, __kernel_old_time_t *time)
{
- const struct vdso_data *vd = __arch_get_vdso_data();
__kernel_old_time_t t = READ_ONCE(vd[CS_HRES_COARSE].basetime[CLOCK_REALTIME].sec);
if (time)
@@ -155,9 +154,9 @@ static __maybe_unused __kernel_old_time_t __cvdso_time(__kernel_old_time_t *time
#ifdef VDSO_HAS_CLOCK_GETRES
static __maybe_unused
-int __cvdso_clock_getres(clockid_t clock, struct __kernel_timespec *res)
+int __cvdso_clock_getres(const struct vdso_data *vd, clockid_t clock,
+ struct __kernel_timespec *res)
{
- const struct vdso_data *vd = __arch_get_vdso_data();
u64 hrtimer_res;
u32 msk;
u64 ns;
@@ -199,10 +198,11 @@ int __cvdso_clock_getres(clockid_t clock, struct __kernel_timespec *res)
}
static __maybe_unused int
-__cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res)
+__cvdso_clock_getres_time32(const struct vdso_data *vd, clockid_t clock,
+ struct old_timespec32 *res)
{
struct __kernel_timespec ts;
- int ret = __cvdso_clock_getres(clock, &ts);
+ int ret = __cvdso_clock_getres(vd, clock, &ts);
if (likely(!ret && res)) {
res->tv_sec = ts.tv_sec;
--
2.13.3
next prev parent reply other threads:[~2019-12-23 14:31 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-23 14:31 [RFC PATCH v2 00/10] powerpc/32: switch VDSO to C implementation Christophe Leroy
2019-12-23 14:31 ` [RFC PATCH v2 01/10] lib: vdso: ensure all arches have 32bit fallback Christophe Leroy
2019-12-24 2:07 ` Andy Lutomirski
2020-01-10 20:56 ` Thomas Gleixner
2020-01-10 21:02 ` Andy Lutomirski
2019-12-30 12:27 ` Arnd Bergmann
2020-01-02 11:29 ` Arnd Bergmann
2020-01-09 15:43 ` Christophe Leroy
2019-12-23 14:31 ` [RFC PATCH v2 02/10] lib: vdso: move call to fallback out of common code Christophe Leroy
2019-12-24 2:24 ` Andy Lutomirski
2019-12-24 11:41 ` christophe leroy
2019-12-24 12:09 ` Andy Lutomirski
2019-12-23 14:31 ` [RFC PATCH v2 03/10] lib: vdso: Change __cvdso_clock_gettime/getres_common() to __cvdso_clock_gettime/getres() Christophe Leroy
2019-12-23 14:31 ` Christophe Leroy [this message]
2019-12-24 2:27 ` [RFC PATCH v2 04/10] lib: vdso: get pointer to vdso data from the arch Andy Lutomirski
2019-12-24 11:53 ` christophe leroy
2019-12-24 12:15 ` Andy Lutomirski
2019-12-24 12:41 ` Andy Lutomirski
2019-12-24 14:46 ` Segher Boessenkool
2019-12-23 14:31 ` [RFC PATCH v2 05/10] lib: vdso: inline do_hres() Christophe Leroy
2019-12-24 2:29 ` Andy Lutomirski
2019-12-30 12:07 ` Arnd Bergmann
2020-01-10 21:07 ` Thomas Gleixner
2020-01-11 9:06 ` Christophe Leroy
2019-12-23 14:31 ` [RFC PATCH v2 06/10] lib: vdso: make do_coarse() return 0 Christophe Leroy
2019-12-23 14:31 ` [RFC PATCH v2 07/10] lib: vdso: don't use READ_ONCE() in __c_kernel_time() Christophe Leroy
2019-12-24 1:58 ` Andy Lutomirski
2019-12-24 11:12 ` christophe leroy
2019-12-24 12:04 ` Andy Lutomirski
2020-01-10 21:12 ` Thomas Gleixner
2020-01-11 8:05 ` Christophe Leroy
2020-01-11 11:07 ` Thomas Gleixner
2020-01-13 6:52 ` Christophe Leroy
2019-12-23 14:31 ` [RFC PATCH v2 08/10] lib: vdso: Avoid duplication in __cvdso_clock_getres() Christophe Leroy
2019-12-24 1:59 ` Andy Lutomirski
2019-12-23 14:31 ` [RFC PATCH v2 09/10] powerpc/vdso32: inline __get_datapage() Christophe Leroy
2019-12-23 14:31 ` [RFC PATCH v2 10/10] powerpc/32: Switch VDSO to C implementation Christophe Leroy
2020-01-09 17:52 ` Surprising code generated for vdso_read_begin() Christophe Leroy
2020-01-09 20:07 ` Segher Boessenkool
2020-01-10 6:45 ` Christophe Leroy
2020-01-11 11:33 ` Segher Boessenkool
2020-02-16 18:10 ` Arnd Bergmann
2020-02-19 8:45 ` Christophe Leroy
2020-02-19 9:52 ` Arnd Bergmann
2020-02-19 13:08 ` Segher Boessenkool
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