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authorLinus Torvalds2019-07-14 17:17:34 -0700
committerLinus Torvalds2019-07-14 17:17:34 -0700
commitf2772a0e4833d1af1901b6f1a38136fb71d1350c (patch)
tree28bf6f0944d745e19947273022224ebc6b2d07c8 /arch/um
parentfcd98147ac71f35b69e2f50b5fddc5524dd2dfa8 (diff)
parentb482e48d29f1461fd0d059a17f32bcfa274127b3 (diff)
Merge tag 'for-linus-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml
Pull UML updates from Richard Weinberger: - A new timer mode, time travel, for testing with UML - Many bugixes/improvements for the serial line driver - Various bugfixes * tag 'for-linus-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: um: fix build without CONFIG_UML_TIME_TRAVEL_SUPPORT um: Fix kcov crash during startup um: configs: Remove useless UEVENT_HELPER_PATH um: Support time travel mode um: Pass nsecs to os timer functions um: Remove drivers/ssl.h um: Don't garbage collect in deactivate_all_fds() um: Silence lockdep complaint about mmap_sem um: Remove locking in deactivate_all_fds() um: Timer code cleanup um: fix os_timer_one_shot() um: Fix IRQ controller regression on console read
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/Kconfig12
-rw-r--r--arch/um/configs/i386_defconfig1
-rw-r--r--arch/um/configs/x86_64_defconfig1
-rw-r--r--arch/um/drivers/chan_kern.c52
-rw-r--r--arch/um/drivers/ssl.c1
-rw-r--r--arch/um/drivers/ssl.h13
-rw-r--r--arch/um/include/asm/mmu_context.h2
-rw-r--r--arch/um/include/shared/os.h10
-rw-r--r--arch/um/include/shared/timer-internal.h48
-rw-r--r--arch/um/kernel/irq.c9
-rw-r--r--arch/um/kernel/process.c42
-rw-r--r--arch/um/kernel/skas/Makefile2
-rw-r--r--arch/um/kernel/skas/syscall.c11
-rw-r--r--arch/um/kernel/time.c131
-rw-r--r--arch/um/os-Linux/time.c127
15 files changed, 320 insertions, 142 deletions
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 6b6eb938fcc1..3c3adfc486f2 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -184,6 +184,18 @@ config SECCOMP
If unsure, say Y.
+config UML_TIME_TRAVEL_SUPPORT
+ bool
+ prompt "Support time-travel mode (e.g. for test execution)"
+ help
+ Enable this option to support time travel inside the UML instance.
+
+ After enabling this option, two modes are accessible at runtime
+ (selected by the kernel command line), see the kernel's command-
+ line help for more details.
+
+ It is safe to say Y, but you probably don't need this.
+
endmenu
source "arch/um/drivers/Kconfig"
diff --git a/arch/um/configs/i386_defconfig b/arch/um/configs/i386_defconfig
index 8f114e3b0a7a..73e98bb57bf5 100644
--- a/arch/um/configs/i386_defconfig
+++ b/arch/um/configs/i386_defconfig
@@ -36,7 +36,6 @@ CONFIG_XTERM_CHAN=y
CONFIG_CON_CHAN="pts"
CONFIG_SSL_CHAN="pts"
CONFIG_UML_SOUND=m
-CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_BLK_DEV_UBD=y
diff --git a/arch/um/configs/x86_64_defconfig b/arch/um/configs/x86_64_defconfig
index 5d0875fc0db2..3281d7600225 100644
--- a/arch/um/configs/x86_64_defconfig
+++ b/arch/um/configs/x86_64_defconfig
@@ -34,7 +34,6 @@ CONFIG_XTERM_CHAN=y
CONFIG_CON_CHAN="pts"
CONFIG_SSL_CHAN="pts"
CONFIG_UML_SOUND=m
-CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_BLK_DEV_UBD=y
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index a4e64edb8f38..749d2bf59599 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -171,19 +171,55 @@ int enable_chan(struct line *line)
return err;
}
+/* Items are added in IRQ context, when free_irq can't be called, and
+ * removed in process context, when it can.
+ * This handles interrupt sources which disappear, and which need to
+ * be permanently disabled. This is discovered in IRQ context, but
+ * the freeing of the IRQ must be done later.
+ */
+static DEFINE_SPINLOCK(irqs_to_free_lock);
+static LIST_HEAD(irqs_to_free);
+
+void free_irqs(void)
+{
+ struct chan *chan;
+ LIST_HEAD(list);
+ struct list_head *ele;
+ unsigned long flags;
+
+ spin_lock_irqsave(&irqs_to_free_lock, flags);
+ list_splice_init(&irqs_to_free, &list);
+ spin_unlock_irqrestore(&irqs_to_free_lock, flags);
+
+ list_for_each(ele, &list) {
+ chan = list_entry(ele, struct chan, free_list);
+
+ if (chan->input && chan->enabled)
+ um_free_irq(chan->line->driver->read_irq, chan);
+ if (chan->output && chan->enabled)
+ um_free_irq(chan->line->driver->write_irq, chan);
+ chan->enabled = 0;
+ }
+}
+
static void close_one_chan(struct chan *chan, int delay_free_irq)
{
+ unsigned long flags;
+
if (!chan->opened)
return;
- /* we can safely call free now - it will be marked
- * as free and freed once the IRQ stopped processing
- */
- if (chan->input && chan->enabled)
- um_free_irq(chan->line->driver->read_irq, chan);
- if (chan->output && chan->enabled)
- um_free_irq(chan->line->driver->write_irq, chan);
- chan->enabled = 0;
+ if (delay_free_irq) {
+ spin_lock_irqsave(&irqs_to_free_lock, flags);
+ list_add(&chan->free_list, &irqs_to_free);
+ spin_unlock_irqrestore(&irqs_to_free_lock, flags);
+ } else {
+ if (chan->input && chan->enabled)
+ um_free_irq(chan->line->driver->read_irq, chan);
+ if (chan->output && chan->enabled)
+ um_free_irq(chan->line->driver->write_irq, chan);
+ chan->enabled = 0;
+ }
if (chan->ops->close != NULL)
(*chan->ops->close)(chan->fd, chan->data);
diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
index b8d14fa52059..7ae407d5337e 100644
--- a/arch/um/drivers/ssl.c
+++ b/arch/um/drivers/ssl.c
@@ -12,7 +12,6 @@
#include <linux/console.h>
#include <asm/termbits.h>
#include <asm/irq.h>
-#include "ssl.h"
#include "chan.h"
#include <init.h>
#include <irq_user.h>
diff --git a/arch/um/drivers/ssl.h b/arch/um/drivers/ssl.h
deleted file mode 100644
index 314d17725ce6..000000000000
--- a/arch/um/drivers/ssl.h
+++ /dev/null
@@ -1,13 +0,0 @@
-/*
- * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __SSL_H__
-#define __SSL_H__
-
-extern int ssl_read(int fd, int line);
-extern void ssl_receive_char(int line, char ch);
-
-#endif
-
diff --git a/arch/um/include/asm/mmu_context.h b/arch/um/include/asm/mmu_context.h
index 9f4b4bb78120..00cefd33afdd 100644
--- a/arch/um/include/asm/mmu_context.h
+++ b/arch/um/include/asm/mmu_context.h
@@ -52,7 +52,7 @@ static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
* when the new ->mm is used for the first time.
*/
__switch_mm(&new->context.id);
- down_write(&new->mmap_sem);
+ down_write_nested(&new->mmap_sem, 1);
uml_setup_stubs(new);
up_write(&new->mmap_sem);
}
diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index ebf23012a59b..4a62ac4251a5 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -250,15 +250,13 @@ extern void os_warn(const char *fmt, ...)
/* time.c */
extern void os_idle_sleep(unsigned long long nsecs);
-extern int os_timer_create(void* timer);
-extern int os_timer_set_interval(void* timer, void* its);
-extern int os_timer_one_shot(int ticks);
-extern long long os_timer_disable(void);
-extern long os_timer_remain(void* timer);
+extern int os_timer_create(void);
+extern int os_timer_set_interval(unsigned long long nsecs);
+extern int os_timer_one_shot(unsigned long long nsecs);
+extern void os_timer_disable(void);
extern void uml_idle_timer(void);
extern long long os_persistent_clock_emulation(void);
extern long long os_nsecs(void);
-extern long long os_vnsecs(void);
/* skas/mem.c */
extern long run_syscall_stub(struct mm_id * mm_idp,
diff --git a/arch/um/include/shared/timer-internal.h b/arch/um/include/shared/timer-internal.h
index 03e6f217f807..8574338bf23b 100644
--- a/arch/um/include/shared/timer-internal.h
+++ b/arch/um/include/shared/timer-internal.h
@@ -10,4 +10,52 @@
#define TIMER_MULTIPLIER 256
#define TIMER_MIN_DELTA 500
+enum time_travel_mode {
+ TT_MODE_OFF,
+ TT_MODE_BASIC,
+ TT_MODE_INFCPU,
+};
+
+enum time_travel_timer_mode {
+ TT_TMR_DISABLED,
+ TT_TMR_ONESHOT,
+ TT_TMR_PERIODIC,
+};
+
+#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
+extern enum time_travel_mode time_travel_mode;
+extern unsigned long long time_travel_time;
+extern enum time_travel_timer_mode time_travel_timer_mode;
+extern unsigned long long time_travel_timer_expiry;
+extern unsigned long long time_travel_timer_interval;
+
+static inline void time_travel_set_time(unsigned long long ns)
+{
+ time_travel_time = ns;
+}
+
+static inline void time_travel_set_timer(enum time_travel_timer_mode mode,
+ unsigned long long expiry)
+{
+ time_travel_timer_mode = mode;
+ time_travel_timer_expiry = expiry;
+}
+#else
+#define time_travel_mode TT_MODE_OFF
+#define time_travel_time 0
+#define time_travel_timer_expiry 0
+#define time_travel_timer_interval 0
+
+static inline void time_travel_set_time(unsigned long long ns)
+{
+}
+
+static inline void time_travel_set_timer(enum time_travel_timer_mode mode,
+ unsigned long long expiry)
+{
+}
+
+#define time_travel_timer_mode TT_TMR_DISABLED
+#endif
+
#endif
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index 598d7b3d9355..efde1f16c603 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -21,6 +21,8 @@
#include <irq_user.h>
+extern void free_irqs(void);
+
/* When epoll triggers we do not know why it did so
* we can also have different IRQs for read and write.
* This is why we keep a small irq_fd array for each fd -
@@ -100,6 +102,8 @@ void sigio_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
}
}
}
+
+ free_irqs();
}
static int assign_epoll_events_to_irq(struct irq_entry *irq_entry)
@@ -380,10 +384,8 @@ EXPORT_SYMBOL(deactivate_fd);
*/
int deactivate_all_fds(void)
{
- unsigned long flags;
struct irq_entry *to_free;
- spin_lock_irqsave(&irq_lock, flags);
/* Stop IO. The IRQ loop has no lock so this is our
* only way of making sure we are safe to dispose
* of all IRQ handlers
@@ -399,8 +401,7 @@ int deactivate_all_fds(void)
);
to_free = to_free->next;
}
- garbage_collect_irq_entries();
- spin_unlock_irqrestore(&irq_lock, flags);
+ /* don't garbage collect - we can no longer call kfree() here */
os_close_epoll_fd();
return 0;
}
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 691b83b10649..67c0d1a860e9 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -203,10 +203,50 @@ void initial_thread_cb(void (*proc)(void *), void *arg)
kmalloc_ok = save_kmalloc_ok;
}
+static void time_travel_sleep(unsigned long long duration)
+{
+ unsigned long long next = time_travel_time + duration;
+
+ if (time_travel_mode != TT_MODE_INFCPU)
+ os_timer_disable();
+
+ if (time_travel_timer_mode != TT_TMR_DISABLED ||
+ time_travel_timer_expiry < next) {
+ if (time_travel_timer_mode == TT_TMR_ONESHOT)
+ time_travel_set_timer(TT_TMR_DISABLED, 0);
+ /*
+ * time_travel_time will be adjusted in the timer
+ * IRQ handler so it works even when the signal
+ * comes from the OS timer
+ */
+ deliver_alarm();
+ } else {
+ time_travel_set_time(next);
+ }
+
+ if (time_travel_mode != TT_MODE_INFCPU) {
+ if (time_travel_timer_mode == TT_TMR_PERIODIC)
+ os_timer_set_interval(time_travel_timer_interval);
+ else if (time_travel_timer_mode == TT_TMR_ONESHOT)
+ os_timer_one_shot(time_travel_timer_expiry - next);
+ }
+}
+
+static void um_idle_sleep(void)
+{
+ unsigned long long duration = UM_NSEC_PER_SEC;
+
+ if (time_travel_mode != TT_MODE_OFF) {
+ time_travel_sleep(duration);
+ } else {
+ os_idle_sleep(duration);
+ }
+}
+
void arch_cpu_idle(void)
{
cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
- os_idle_sleep(UM_NSEC_PER_SEC);
+ um_idle_sleep();
local_irq_enable();
}
diff --git a/arch/um/kernel/skas/Makefile b/arch/um/kernel/skas/Makefile
index 0b76d8869c94..5bd3edfcfedf 100644
--- a/arch/um/kernel/skas/Makefile
+++ b/arch/um/kernel/skas/Makefile
@@ -12,4 +12,6 @@ obj-y := clone.o mmu.o process.o syscall.o uaccess.o
CFLAGS_clone.o := $(CFLAGS_NO_HARDENING)
UNPROFILE_OBJS := clone.o
+KCOV_INSTRUMENT := n
+
include arch/um/scripts/Makefile.rules
diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c
index b783ac87d98a..44bb10785075 100644
--- a/arch/um/kernel/skas/syscall.c
+++ b/arch/um/kernel/skas/syscall.c
@@ -10,12 +10,23 @@
#include <sysdep/ptrace.h>
#include <sysdep/ptrace_user.h>
#include <sysdep/syscalls.h>
+#include <shared/timer-internal.h>
void handle_syscall(struct uml_pt_regs *r)
{
struct pt_regs *regs = container_of(r, struct pt_regs, regs);
int syscall;
+ /*
+ * If we have infinite CPU resources, then make every syscall also a
+ * preemption point, since we don't have any other preemption in this
+ * case, and kernel threads would basically never run until userspace
+ * went to sleep, even if said userspace interacts with the kernel in
+ * various ways.
+ */
+ if (time_travel_mode == TT_MODE_INFCPU)
+ schedule();
+
/* Initialize the syscall number and default return value. */
UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS);
diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c
index 0c572a48158e..6a051b078359 100644
--- a/arch/um/kernel/time.c
+++ b/arch/um/kernel/time.c
@@ -19,11 +19,29 @@
#include <kern_util.h>
#include <os.h>
#include <timer-internal.h>
+#include <shared/init.h>
+
+#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
+enum time_travel_mode time_travel_mode;
+unsigned long long time_travel_time;
+enum time_travel_timer_mode time_travel_timer_mode;
+unsigned long long time_travel_timer_expiry;
+unsigned long long time_travel_timer_interval;
+
+static bool time_travel_start_set;
+static unsigned long long time_travel_start;
+#else
+#define time_travel_start_set 0
+#define time_travel_start 0
+#endif
void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
{
unsigned long flags;
+ if (time_travel_mode != TT_MODE_OFF)
+ time_travel_set_time(time_travel_timer_expiry);
+
local_irq_save(flags);
do_IRQ(TIMER_IRQ, regs);
local_irq_restore(flags);
@@ -31,26 +49,47 @@ void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
static int itimer_shutdown(struct clock_event_device *evt)
{
- os_timer_disable();
+ if (time_travel_mode != TT_MODE_OFF)
+ time_travel_set_timer(TT_TMR_DISABLED, 0);
+
+ if (time_travel_mode != TT_MODE_INFCPU)
+ os_timer_disable();
+
return 0;
}
static int itimer_set_periodic(struct clock_event_device *evt)
{
- os_timer_set_interval(NULL, NULL);
+ unsigned long long interval = NSEC_PER_SEC / HZ;
+
+ if (time_travel_mode != TT_MODE_OFF)
+ time_travel_set_timer(TT_TMR_PERIODIC,
+ time_travel_time + interval);
+
+ if (time_travel_mode != TT_MODE_INFCPU)
+ os_timer_set_interval(interval);
+
return 0;
}
static int itimer_next_event(unsigned long delta,
struct clock_event_device *evt)
{
- return os_timer_one_shot(delta);
+ delta += 1;
+
+ if (time_travel_mode != TT_MODE_OFF)
+ time_travel_set_timer(TT_TMR_ONESHOT,
+ time_travel_time + delta);
+
+ if (time_travel_mode != TT_MODE_INFCPU)
+ return os_timer_one_shot(delta);
+
+ return 0;
}
static int itimer_one_shot(struct clock_event_device *evt)
{
- os_timer_one_shot(1);
- return 0;
+ return itimer_next_event(0, evt);
}
static struct clock_event_device timer_clockevent = {
@@ -87,6 +126,17 @@ static irqreturn_t um_timer(int irq, void *dev)
static u64 timer_read(struct clocksource *cs)
{
+ if (time_travel_mode != TT_MODE_OFF) {
+ /*
+ * We make reading the timer cost a bit so that we don't get
+ * stuck in loops that expect time to move more than the
+ * exact requested sleep amount, e.g. python's socket server,
+ * see https://bugs.python.org/issue37026.
+ */
+ time_travel_set_time(time_travel_time + TIMER_MULTIPLIER);
+ return time_travel_time / TIMER_MULTIPLIER;
+ }
+
return os_nsecs() / TIMER_MULTIPLIER;
}
@@ -107,7 +157,7 @@ static void __init um_timer_setup(void)
printk(KERN_ERR "register_timer : request_irq failed - "
"errno = %d\n", -err);
- err = os_timer_create(NULL);
+ err = os_timer_create();
if (err != 0) {
printk(KERN_ERR "creation of timer failed - errno = %d\n", -err);
return;
@@ -123,7 +173,12 @@ static void __init um_timer_setup(void)
void read_persistent_clock64(struct timespec64 *ts)
{
- long long nsecs = os_persistent_clock_emulation();
+ long long nsecs;
+
+ if (time_travel_start_set)
+ nsecs = time_travel_start + time_travel_time;
+ else
+ nsecs = os_persistent_clock_emulation();
set_normalized_timespec64(ts, nsecs / NSEC_PER_SEC,
nsecs % NSEC_PER_SEC);
@@ -134,3 +189,65 @@ void __init time_init(void)
timer_set_signal_handler();
late_time_init = um_timer_setup;
}
+
+#ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT
+unsigned long calibrate_delay_is_known(void)
+{
+ if (time_travel_mode == TT_MODE_INFCPU)
+ return 1;
+ return 0;
+}
+
+int setup_time_travel(char *str)
+{
+ if (strcmp(str, "=inf-cpu") == 0) {
+ time_travel_mode = TT_MODE_INFCPU;
+ timer_clockevent.name = "time-travel-timer-infcpu";
+ timer_clocksource.name = "time-travel-clock";
+ return 1;
+ }
+
+ if (!*str) {
+ time_travel_mode = TT_MODE_BASIC;
+ timer_clockevent.name = "time-travel-timer";
+ timer_clocksource.name = "time-travel-clock";
+ return 1;
+ }
+
+ return -EINVAL;
+}
+
+__setup("time-travel", setup_time_travel);
+__uml_help(setup_time_travel,
+"time-travel\n"
+"This option just enables basic time travel mode, in which the clock/timers\n"
+"inside the UML instance skip forward when there's nothing to do, rather than\n"
+"waiting for real time to elapse. However, instance CPU speed is limited by\n"
+"the real CPU speed, so e.g. a 10ms timer will always fire after ~10ms wall\n"
+"clock (but quicker when there's nothing to do).\n"
+"\n"
+"time-travel=inf-cpu\n"
+"This enables time travel mode with infinite processing power, in which there\n"
+"are no wall clock timers, and any CPU processing happens - as seen from the\n"
+"guest - instantly. This can be useful for accurate simulation regardless of\n"
+"debug overhead, physical CPU speed, etc. but is somewhat dangerous as it can\n"
+"easily lead to getting stuck (e.g. if anything in the system busy loops).\n");
+
+int setup_time_travel_start(char *str)
+{
+ int err;
+
+ err = kstrtoull(str, 0, &time_travel_start);
+ if (err)
+ return err;
+
+ time_travel_start_set = 1;
+ return 1;
+}
+
+__setup("time-travel-start", setup_time_travel_start);
+__uml_help(setup_time_travel_start,
+"time-travel-start=<seconds>\n"
+"Configure the UML instance's wall clock to start at this value rather than\n"
+"the host's wall clock at the time of UML boot.\n");
+#endif
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index 0e39b9978729..6d94ff52362c 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -26,11 +26,11 @@ static inline long long timeval_to_ns(const struct timeval *tv)
static inline long long timespec_to_ns(const struct timespec *ts)
{
- return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) +
- ts->tv_nsec;
+ return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) + ts->tv_nsec;
}
-long long os_persistent_clock_emulation (void) {
+long long os_persistent_clock_emulation(void)
+{
struct timespec realtime_tp;
clock_gettime(CLOCK_REALTIME, &realtime_tp);
@@ -40,94 +40,41 @@ long long os_persistent_clock_emulation (void) {
/**
* os_timer_create() - create an new posix (interval) timer
*/
-int os_timer_create(void* timer) {
-
- timer_t* t = timer;
-
- if(t == NULL) {
- t = &event_high_res_timer;
- }
+int os_timer_create(void)
+{
+ timer_t *t = &event_high_res_timer;
- if (timer_create(
- CLOCK_MONOTONIC,
- NULL,
- t) == -1) {
+ if (timer_create(CLOCK_MONOTONIC, NULL, t) == -1)
return -1;
- }
+
return 0;
}
-int os_timer_set_interval(void* timer, void* i)
+int os_timer_set_interval(unsigned long long nsecs)
{
struct itimerspec its;
- unsigned long long nsec;
- timer_t* t = timer;
- struct itimerspec* its_in = i;
-
- if(t == NULL) {
- t = &event_high_res_timer;
- }
- nsec = UM_NSEC_PER_SEC / UM_HZ;
+ its.it_value.tv_sec = nsecs / UM_NSEC_PER_SEC;
+ its.it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC;
- if(its_in != NULL) {
- its.it_value.tv_sec = its_in->it_value.tv_sec;
- its.it_value.tv_nsec = its_in->it_value.tv_nsec;
- } else {
- its.it_value.tv_sec = 0;
- its.it_value.tv_nsec = nsec;
- }
+ its.it_interval.tv_sec = nsecs / UM_NSEC_PER_SEC;
+ its.it_interval.tv_nsec = nsecs % UM_NSEC_PER_SEC;
- its.it_interval.tv_sec = 0;
- its.it_interval.tv_nsec = nsec;
-
- if(timer_settime(*t, 0, &its, NULL) == -1) {
+ if (timer_settime(event_high_res_timer, 0, &its, NULL) == -1)
return -errno;
- }
return 0;
}
-/**
- * os_timer_remain() - returns the remaining nano seconds of the given interval
- * timer
- * Because this is the remaining time of an interval timer, which correspondends
- * to HZ, this value can never be bigger than one second. Just
- * the nanosecond part of the timer is returned.
- * The returned time is relative to the start time of the interval timer.
- * Return an negative value in an error case.
- */
-long os_timer_remain(void* timer)
+int os_timer_one_shot(unsigned long long nsecs)
{
- struct itimerspec its;
- timer_t* t = timer;
-
- if(t == NULL) {
- t = &event_high_res_timer;
- }
-
- if(timer_gettime(t, &its) == -1) {
- return -errno;
- }
+ struct itimerspec its = {
+ .it_value.tv_sec = nsecs / UM_NSEC_PER_SEC,
+ .it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC,
- return its.it_value.tv_nsec;
-}
-
-int os_timer_one_shot(int ticks)
-{
- struct itimerspec its;
- unsigned long long nsec;
- unsigned long sec;
-
- nsec = (ticks + 1);
- sec = nsec / UM_NSEC_PER_SEC;
- nsec = nsec % UM_NSEC_PER_SEC;
-
- its.it_value.tv_sec = nsec / UM_NSEC_PER_SEC;
- its.it_value.tv_nsec = nsec;
-
- its.it_interval.tv_sec = 0;
- its.it_interval.tv_nsec = 0; // we cheat here
+ .it_interval.tv_sec = 0,
+ .it_interval.tv_nsec = 0, // we cheat here
+ };
timer_settime(event_high_res_timer, 0, &its, NULL);
return 0;
@@ -135,24 +82,13 @@ int os_timer_one_shot(int ticks)
/**
* os_timer_disable() - disable the posix (interval) timer
- * Returns the remaining interval timer time in nanoseconds
*/
-long long os_timer_disable(void)
+void os_timer_disable(void)
{
struct itimerspec its;
memset(&its, 0, sizeof(struct itimerspec));
- timer_settime(event_high_res_timer, 0, &its, &its);
-
- return its.it_value.tv_sec * UM_NSEC_PER_SEC + its.it_value.tv_nsec;
-}
-
-long long os_vnsecs(void)
-{
- struct timespec ts;
-
- clock_gettime(CLOCK_PROCESS_CPUTIME_ID,&ts);
- return timespec_to_ns(&ts);
+ timer_settime(event_high_res_timer, 0, &its, NULL);
}
long long os_nsecs(void)
@@ -169,21 +105,14 @@ long long os_nsecs(void)
*/
void os_idle_sleep(unsigned long long nsecs)
{
- struct timespec ts;
-
- if (nsecs <= 0) {
- return;
- }
-
- ts = ((struct timespec) {
- .tv_sec = nsecs / UM_NSEC_PER_SEC,
- .tv_nsec = nsecs % UM_NSEC_PER_SEC
- });
+ struct timespec ts = {
+ .tv_sec = nsecs / UM_NSEC_PER_SEC,
+ .tv_nsec = nsecs % UM_NSEC_PER_SEC
+ };
/*
* Relay the signal if clock_nanosleep is interrupted.
*/
- if (clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL)) {
+ if (clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL))
deliver_alarm();
- }
}