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* timer: protect timers_state's clock with seqlockLiu Ping Fan2013-10-171-0/+2
| | | | | | | | | | | | | | | QEMU_CLOCK_VIRTUAL may be read outside BQL. This will make its foundation, i.e. cpu_clock_offset exposed to race condition. Using private lock to protect it. After this patch, reading QEMU_CLOCK_VIRTUAL is thread safe unless use_icount is true, in which case the existing callers still rely on the BQL. Lock rule: private lock innermost, ie BQL->"this lock" Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* qemu-timer: make qemu_timer_mod_ns() and qemu_timer_del() thread-safeStefan Hajnoczi2013-09-181-0/+17
| | | | | | | | | | | | | | | Introduce QEMUTimerList->active_timers_lock to protect the linked list of active timers. This allows qemu_timer_mod_ns() to be called from any thread. Note that vm_clock is not thread-safe and its use of qemu_clock_has_timers() works fine today but is also not thread-safe. The purpose of this patch is to eventually let device models set or cancel timers from a vcpu thread without holding the global mutex. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Remove legacy interfaceAlex Bligh2013-08-221-212/+2Star
| | | | | | | | | Remove the legacy interface from include/qemu/timers.h. Ensure struct QEMUClock is not exposed at all. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Remove main_loop_timerlistAlex Bligh2013-08-221-5/+1Star
| | | | | | | | | | Now we have timerlistgroups implemented and main_loop_tlg, we no longer need the concept of a default timer list associated with each clock. Remove it and simplify initialisation of clocks and timer lists. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Rearrange timer.h & make legacy functions call non-legacyAlex Bligh2013-08-221-273/+341
| | | | | | | | | | | Rearrange timer.h so it is in order by function type. Make legacy functions call non-legacy functions rather than vice-versa. Convert cpus.c to use new API. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Add qemu_clock_get_ms and qemu_clock_get_msAlex Bligh2013-08-221-0/+28
| | | | | | | Add utility functions qemu_clock_get_ms and qemu_clock_get_us Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Remove legacy qemu_clock_deadline & qemu_timerlist_deadlineAlex Bligh2013-08-221-16/+0Star
| | | | | | | | Remove qemu_clock_deadline and qemu_timerlist_deadline now we are using the ns functions throughout. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Remove alarm timersAlex Bligh2013-08-221-3/+0Star
| | | | | | | | Remove alarm timers from qemu-timers.c now we use g_poll / ppoll instead. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Add documentation and new format callsAlex Bligh2013-08-221-22/+184
| | | | | | | | | Add documentation for existing qemu timer calls. Add new format calls of the format timer_XXX rather than qemu_XXX_timer for consistency. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Use all timerlists in icount warp calculationsAlex Bligh2013-08-221-0/+13
| | | | | | | | | | | | | | | | | | | Notify all timerlists derived from vm_clock in icount warp calculations. When calculating timer delay based on vm_clock deadline, use all timerlists. For compatibility, maintain an apparent bug where when using icount, if no vm_clock timer was set, qemu_clock_deadline would return INT32_MAX and always set an icount clock expiry about 2 seconds ahead. NB: thread safety - when different timerlists sit on different threads, this will need some locking. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Introduce new API timer_new and friendsAlex Bligh2013-08-221-0/+69
| | | | | | | | Introduce new API for creating timers - timer_new and _ns, _ms, _us derivatives. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: On timer modification, qemu_notify or aio_notifyAlex Bligh2013-08-221-0/+9
| | | | | | | | | | | On qemu_mod_timer_ns, ensure qemu_notify or aio_notify is called to end the appropriate poll(), irrespective of use_icount value. On qemu_clock_enable, ensure qemu_notify or aio_notify is called for all QEMUTimerLists attached to the QEMUClock. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Add a notify callback to QEMUTimerListAlex Bligh2013-08-221-4/+23
| | | | | | | | Add a notify pointer to QEMUTimerList so it knows what to notify on a timer change. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Add QEMUTimerListGroup and helper functionsAlex Bligh2013-08-221-0/+49
| | | | | | | | | | | Add QEMUTimerListGroup and helper functions, to represent a QEMUTimerList associated with each clock. Add a default QEMUTimerListGroup representing the default timer lists which are not associated with any other object (e.g. an AioContext as added by future patches). Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Untangle include filesAlex Bligh2013-08-221-1/+0Star
| | | | | | | | | | include/qemu/timer.h has no need to include main-loop.h and doing so causes an issue for the next patch. Unfortunately various files assume including timers.h will pull in main-loop.h. Untangle this mess. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Split QEMUClock into QEMUClock and QEMUTimerListAlex Bligh2013-08-221-23/+325
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Split QEMUClock into QEMUClock and QEMUTimerList so that we can have more than one QEMUTimerList associated with the same clock. Introduce a main_loop_timerlist concept and make existing qemu_clock_* calls that actually should operate on a QEMUTimerList call the relevant QEMUTimerList implementations, using the clock's default timerlist. This vastly reduces the invasiveness of this change and means the API stays constant for existing users. Introduce a list of QEMUTimerLists associated with each clock so that reenabling the clock can cause all the notifiers to be called. Note the code to do the notifications is added in a later patch. Switch QEMUClockType to an enum. Remove global variables vm_clock, host_clock and rt_clock and add compatibility defines. Do not fix qemu_next_alarm_deadline as it's going to be deleted. Add qemu_clock_use_for_deadline to indicate whether a particular clock should be used for deadline calculations. When use_icount is true, vm_clock should not be used for deadline calculations as it does not contain a nanosecond count. Instead, icount timeouts come from the execution thread doing aio_notify or qemu_notify as appropriate. This function is used in the next patch. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Make qemu_run_timers and qemu_run_all_timers return progressAlex Bligh2013-08-221-2/+19
| | | | | | | | | Make qemu_run_timers and qemu_run_all_timers return progress so that aio_poll etc. can determine whether a timer has been run. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: add ppoll support with qemu_poll_nsAlex Bligh2013-08-221-0/+12
| | | | | | | | Add qemu_poll_ns which works like g_poll but takes a nanosecond timeout. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: add qemu-timer.c utility functionsAlex Bligh2013-08-221-0/+42
| | | | | | | | | | | | | | | Add utility functions to qemu-timer.c for nanosecond timing. Add qemu_clock_deadline_ns to calculate deadlines to nanosecond accuracy. Add utility function qemu_soonest_timeout to calculate soonest deadline. Add qemu_timeout_ns_to_ms to convert a timeout in nanoseconds back to milliseconds for when ppoll is not used. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Rename qemu_new_clock and expose clock typesAlex Bligh2013-08-221-0/+4
| | | | | | | | | Rename qemu_new_clock to qemu_clock_new. Expose clock types. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* aio / timers: Rename qemu_timer_* functionsAlex Bligh2013-08-221-3/+3
| | | | | | | | | | | | Rename four functions in preparation for new API. Rename qemu_timer_expired to timer_expired Rename qemu_timer_expire_time_ns to timer_expire_time_ns Rename qemu_timer_pending to timer_pending Rename qemu_timer_expired_ns to timer_expired_ns Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
* Remove unnecessary FreeBSD #includeEd Maste2013-04-251-4/+0Star
| | | | | | | | | | | | sys/param.h was included to define __FreeBSD_version, but the conditional using it was removed by commit d05ef160453e98546a4197496dc8a3cb2defac53 (Brad Smith, "Allow clock_gettime() monotonic clock to be utilized on more OS's"), so the include is no longer needed here. Signed-off-by: Ed Maste <emaste@freebsd.org> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1366906631-2680-1-git-send-email-emaste@freebsd.org Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* Allow clock_gettime() monotonic clock to be utilized on more OS'sBrad Smith2013-04-051-2/+1Star
| | | | | | | | | | | | Allow the clock_gettime() code using monotonic clock to be utilized on more POSIX compliannt OS's. This started as a fix for OpenBSD which was listed in one function as part of the previous hard coded list of OS's for the functions to support but not in the other. Signed-off-by: Brad Smith <brad@comstyle.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 20130405003748.GH884@rox.home.comstyle.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
* misc: move include files to include/qemu/Paolo Bonzini2012-12-191-0/+310
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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