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2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87 
 kernel/arch/arm/vdso/vgettimeofday.c
....@@ -1,271 +1,34 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
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+ * ARM userspace implementations of gettimeofday() and similar.
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+ *
25  * Copyright 2015 Mentor Graphics Corporation.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; version 2 of the
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- * License.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- * General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
166  */
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-
18
-#include <linux/compiler.h>
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-#include <linux/hrtimer.h>
207 #include <linux/time.h>
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-#include <asm/barrier.h>
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-#include <asm/bug.h>
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-#include <asm/cp15.h>
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-#include <asm/page.h>
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-#include <asm/unistd.h>
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-#include <asm/vdso_datapage.h>
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+#include <linux/types.h>
279 
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-#ifndef CONFIG_AEABI
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-#error This code depends on AEABI system call conventions
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-#endif
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-
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-extern struct vdso_data *__get_datapage(void);
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-
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-static notrace u32 __vdso_read_begin(const struct vdso_data *vdata)
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+int __vdso_clock_gettime(clockid_t clock,
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+			 struct old_timespec32 *ts)
3512 {
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-	u32 seq;
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-repeat:
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-	seq = READ_ONCE(vdata->seq_count);
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-	if (seq & 1) {
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-		cpu_relax();
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-		goto repeat;
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-	}
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-	return seq;
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+	return __cvdso_clock_gettime32(clock, ts);
4414 }
4515 
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-static notrace u32 vdso_read_begin(const struct vdso_data *vdata)
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+int __vdso_clock_gettime64(clockid_t clock,
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+			   struct __kernel_timespec *ts)
4718 {
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-	u32 seq;
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-
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-	seq = __vdso_read_begin(vdata);
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-
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-	smp_rmb(); /* Pairs with smp_wmb in vdso_write_end */
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-	return seq;
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+	return __cvdso_clock_gettime(clock, ts);
5420 }
5521 
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-static notrace int vdso_read_retry(const struct vdso_data *vdata, u32 start)
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+int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
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+			struct timezone *tz)
5724 {
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-	smp_rmb(); /* Pairs with smp_wmb in vdso_write_begin */
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-	return vdata->seq_count != start;
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+	return __cvdso_gettimeofday(tv, tz);
6026 }
6127 
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-static notrace long clock_gettime_fallback(clockid_t _clkid,
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-					   struct timespec *_ts)
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+int __vdso_clock_getres(clockid_t clock_id,
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+			struct old_timespec32 *res)
6430 {
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-	register struct timespec *ts asm("r1") = _ts;
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-	register clockid_t clkid asm("r0") = _clkid;
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-	register long ret asm ("r0");
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-	register long nr asm("r7") = __NR_clock_gettime;
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-
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-	asm volatile(
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-	"	swi #0\n"
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-	: "=r" (ret)
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-	: "r" (clkid), "r" (ts), "r" (nr)
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-	: "memory");
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-
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-	return ret;
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-}
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-
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-static notrace int do_realtime_coarse(struct timespec *ts,
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-				      struct vdso_data *vdata)
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-{
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-	u32 seq;
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-
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-	do {
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-		seq = vdso_read_begin(vdata);
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-
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-		ts->tv_sec = vdata->xtime_coarse_sec;
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-		ts->tv_nsec = vdata->xtime_coarse_nsec;
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-
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-	} while (vdso_read_retry(vdata, seq));
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-
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-	return 0;
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-}
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-
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-static notrace int do_monotonic_coarse(struct timespec *ts,
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-				       struct vdso_data *vdata)
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-{
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-	struct timespec tomono;
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-	u32 seq;
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-
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-	do {
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-		seq = vdso_read_begin(vdata);
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-
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-		ts->tv_sec = vdata->xtime_coarse_sec;
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-		ts->tv_nsec = vdata->xtime_coarse_nsec;
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-
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-		tomono.tv_sec = vdata->wtm_clock_sec;
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-		tomono.tv_nsec = vdata->wtm_clock_nsec;
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-
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-	} while (vdso_read_retry(vdata, seq));
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-
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-	ts->tv_sec += tomono.tv_sec;
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-	timespec_add_ns(ts, tomono.tv_nsec);
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-
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-	return 0;
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-}
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-
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-#ifdef CONFIG_ARM_ARCH_TIMER
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-
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-static notrace u64 get_ns(struct vdso_data *vdata)
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-{
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-	u64 cycle_delta;
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-	u64 cycle_now;
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-	u64 nsec;
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-
126
-	isb();
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-	cycle_now = read_sysreg(CNTVCT);
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-
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-	cycle_delta = (cycle_now - vdata->cs_cycle_last) & vdata->cs_mask;
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-
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-	nsec = (cycle_delta * vdata->cs_mult) + vdata->xtime_clock_snsec;
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-	nsec >>= vdata->cs_shift;
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-
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-	return nsec;
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-}
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-
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-static notrace int do_realtime(struct timespec *ts, struct vdso_data *vdata)
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-{
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-	u64 nsecs;
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-	u32 seq;
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-
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-	do {
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-		seq = vdso_read_begin(vdata);
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-
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-		if (!vdata->tk_is_cntvct)
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-			return -1;
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-
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-		ts->tv_sec = vdata->xtime_clock_sec;
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-		nsecs = get_ns(vdata);
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-
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-	} while (vdso_read_retry(vdata, seq));
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-
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-	ts->tv_nsec = 0;
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-	timespec_add_ns(ts, nsecs);
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-
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-	return 0;
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-}
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-
159
-static notrace int do_monotonic(struct timespec *ts, struct vdso_data *vdata)
160
-{
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-	struct timespec tomono;
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-	u64 nsecs;
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-	u32 seq;
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-
165
-	do {
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-		seq = vdso_read_begin(vdata);
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-
168
-		if (!vdata->tk_is_cntvct)
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-			return -1;
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-
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-		ts->tv_sec = vdata->xtime_clock_sec;
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-		nsecs = get_ns(vdata);
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-
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-		tomono.tv_sec = vdata->wtm_clock_sec;
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-		tomono.tv_nsec = vdata->wtm_clock_nsec;
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-
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-	} while (vdso_read_retry(vdata, seq));
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-
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-	ts->tv_sec += tomono.tv_sec;
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-	ts->tv_nsec = 0;
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-	timespec_add_ns(ts, nsecs + tomono.tv_nsec);
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-
183
-	return 0;
184
-}
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-
186
-#else /* CONFIG_ARM_ARCH_TIMER */
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-
188
-static notrace int do_realtime(struct timespec *ts, struct vdso_data *vdata)
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-{
190
-	return -1;
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-}
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-
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-static notrace int do_monotonic(struct timespec *ts, struct vdso_data *vdata)
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-{
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-	return -1;
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-}
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-
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-#endif /* CONFIG_ARM_ARCH_TIMER */
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-
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-notrace int __vdso_clock_gettime(clockid_t clkid, struct timespec *ts)
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-{
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-	struct vdso_data *vdata;
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-	int ret = -1;
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-
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-	vdata = __get_datapage();
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-
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-	switch (clkid) {
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-	case CLOCK_REALTIME_COARSE:
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-		ret = do_realtime_coarse(ts, vdata);
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-		break;
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-	case CLOCK_MONOTONIC_COARSE:
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-		ret = do_monotonic_coarse(ts, vdata);
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-		break;
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-	case CLOCK_REALTIME:
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-		ret = do_realtime(ts, vdata);
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-		break;
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-	case CLOCK_MONOTONIC:
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-		ret = do_monotonic(ts, vdata);
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-		break;
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-	default:
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-		break;
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-	}
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-
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-	if (ret)
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-		ret = clock_gettime_fallback(clkid, ts);
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-
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-	return ret;
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-}
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-
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-static notrace long gettimeofday_fallback(struct timeval *_tv,
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-					  struct timezone *_tz)
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-{
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-	register struct timezone *tz asm("r1") = _tz;
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-	register struct timeval *tv asm("r0") = _tv;
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-	register long ret asm ("r0");
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-	register long nr asm("r7") = __NR_gettimeofday;
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-
238
-	asm volatile(
239
-	"	swi #0\n"
240
-	: "=r" (ret)
241
-	: "r" (tv), "r" (tz), "r" (nr)
242
-	: "memory");
243
-
244
-	return ret;
245
-}
246
-
247
-notrace int __vdso_gettimeofday(struct timeval *tv, struct timezone *tz)
248
-{
249
-	struct timespec ts;
250
-	struct vdso_data *vdata;
251
-	int ret;
252
-
253
-	vdata = __get_datapage();
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-
255
-	ret = do_realtime(&ts, vdata);
256
-	if (ret)
257
-		return gettimeofday_fallback(tv, tz);
258
-
259
-	if (tv) {
260
-		tv->tv_sec = ts.tv_sec;
261
-		tv->tv_usec = ts.tv_nsec / 1000;
262
-	}
263
-	if (tz) {
264
-		tz->tz_minuteswest = vdata->tz_minuteswest;
265
-		tz->tz_dsttime = vdata->tz_dsttime;
266
-	}
267
-
268
-	return ret;
31
+	return __cvdso_clock_getres_time32(clock_id, res);
26932 }
27033 
27134 /* Avoid unresolved references emitted by GCC */