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path: root/qemu-timer.c
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2011-06-06timer: drop HPET and RTCAnthony Liguori
dynticks will provide equally good timer granularity on all modern Linux systems. This is more or less dead code these days. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-04-27qemu-timer: Fix timers for w32Stefan Weil
Commit 68c23e5520e8286d79d96ab47c0ea722ceb75041 removed the multimedia timer, but this timer is needed for certain Linux kernels. Otherwise Linux boot stops with this error: MP-BIOS bug: 8254 timer not connected to IO-APIC So the multimedia timer is added again here. Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Weil <weil@mail.berlios.de>
2011-04-27qemu-timer: Avoid type castsStefan Weil
The type casts are no longer needed after some small changes in struct qemu_alarm_timer. This also improves readability of the code. Signed-off-by: Stefan Weil <weil@mail.berlios.de>
2011-04-27qemu-timer: Add and use new function qemu_timer_expired_nsStefan Weil
This simply moves code which is used three times into a new function thus improving readability. Signed-off-by: Stefan Weil <weil@mail.berlios.de>
2011-04-15qemu_next_deadline should not consider host-time timersPaolo Bonzini
It is purely for icount-based virtual timers. And now that we got the code right, rename the function to clarify the intended scope. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Tested-by: Edgar E. Iglesias <edgar.iglesias@gmail.com> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2011-04-15Revert wrong fixes for -icount in the iothread casePaolo Bonzini
This reverts commits 225d02cd and c9f7383c. While some parts of the latter could be saved, I preferred a smooth, complete revert. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Tested-by: Edgar E. Iglesias <edgar.iglesias@gmail.com> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2011-04-15enable vm_clock to "warp" in the iothread+icount casePaolo Bonzini
The previous patch however is not enough, because if the virtual CPU goes to sleep waiting for a future timer interrupt to wake it up, qemu deadlocks. The timer interrupt never comes because time is driven by icount, but the vCPU doesn't run any insns. You could say that VCPUs should never go to sleep in icount mode if there is a pending vm_clock timer; rather time should just warp to the next vm_clock event with no sleep ever taking place. Even better, you can sleep for some time related to the time left until the next event, to avoid that the warps are too visible externally; for example, you could be sending network packets continously instead of every 100ms. This is what this patch implements. qemu_clock_warp is called: 1) whenever a vm_clock timer is adjusted, to ensure the warp_timer is synchronized; 2) at strategic points in the CPU thread, to make sure the insn counter is synchronized before the CPU starts running. In any case, the warp_timer is disabled while the CPU is running, because the insn counter will then be making progress on its own. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Tested-by: Edgar E. Iglesias <edgar.iglesias@gmail.com> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2011-03-21remove qemu_get_clockPaolo Bonzini
These patches are already not doing a great service to out-of-tree modifications to QEMU. However, at least we can warn them by getting rid of the old confusing functions, or otherwise causing compilation errors. This patch removes qemu_get_clock; the previous one changed qemu_new_timer's signature. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-03-21add a generic scaling mechanism for timersPaolo Bonzini
This enables rt_clock timers to use nanosecond resolution, just by using the _ns functions; there is really no reason to forbid that. Migrated timers are all using vm_clock (of course; but I checked that anyway) so the timers in the savevm files are already in nanosecond resolution. So this patch makes no change to the migration format. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-03-21change all other clock references to use nanosecond resolution accessorsPaolo Bonzini
This was done with: sed -i 's/qemu_get_clock\>/qemu_get_clock_ns/' \ $(git grep -l 'qemu_get_clock\>' ) sed -i 's/qemu_new_timer\>/qemu_new_timer_ns/' \ $(git grep -l 'qemu_new_timer\>' ) after checking that get_clock and new_timer never occur twice on the same line. There were no missed occurrences; however, even if there had been, they would have been caught by the compiler. There was exactly one false positive in qemu_run_timers: - current_time = qemu_get_clock (clock); + current_time = qemu_get_clock_ns (clock); which is of course not in this patch. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-03-21change all rt_clock references to use millisecond resolution accessorsPaolo Bonzini
This was done with: sed -i '/get_clock\>.*rt_clock/s/get_clock\>/get_clock_ms/' \ $(git grep -l 'get_clock\>.*rt_clock' ) sed -i '/new_timer\>.*rt_clock/s/new_timer\>/new_timer_ms/' \ $(git grep -l 'new_timer\>.*rt_clock' ) after checking that get_clock and new_timer never occur twice on the same line. There were no missed occurrences; however, even if there had been, they would have been caught by the compiler. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2011-03-13use win32 timer queuesPaolo Bonzini
Multimedia timers are only useful for compatibility with Windows NT 4.0 and earlier. Plus, the implementation in Wine is extremely heavyweight. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2011-03-13implement win32 dynticks timerPaolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2011-02-23do not use qemu_icount_delta in the !use_icount casePaolo Bonzini
The !use_icount code is the same for iothread and non-iothread, except that the timeout is different. Since the timeout might as well be infinite and is only masking bugs, use the higher value. With this change the !use_icount code is handled equivalently in qemu_icount_delta and qemu_calculate_timeout, and we rip it out of the former. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@petalogix.com>
2011-02-07qemu-timer: Fix compilation of new timer code for w32, w64Stefan Weil
qemu_next_alarm_deadline() is needed by MinGW, too. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Anthony Liguori <aliguori@us.ibm.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Weil <weil@mail.berlios.de> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2011-02-04Unify alarm deadline computationPaolo Bonzini
This patch shows how using the correct formula for qemu_next_deadline_dyntick can simplify the code of host_alarm_handler and eliminate useless duplication. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-02-04Correct alarm deadline computationPaolo Bonzini
When the QEMU_CLOCK_HOST clock was added, computation of its deadline was added to qemu_next_deadline, which is correct but incomplete. I noticed this by reading the very convoluted rules whereby qemu_next_deadline_dyntick is computed, which miss QEMU_CLOCK_HOST when use_icount is true. This patch inlines qemu_next_deadline into qemu_next_deadline_dyntick, and then corrects the logic to skip only QEMU_CLOCK_VIRTUAL when use_icount is true. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Cc: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-02-04use nanoseconds everywhere for timeout computationPaolo Bonzini
Suggested by Aurelien Jarno. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-01-23Avoid deadlock whith iothread and icountEdgar E. Iglesias
When using the iothread together with icount, make sure the qemu_icount counter makes forward progress when the vcpu is idle to avoid deadlocks. Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2010-10-23qemu-timer: move commonly used timer code to qemu-timer-commonBlue Swirl
Move timer init functions to a new file, qemu-timer-common.c. Make other critical timer functions inlined to preserve performance in qemu-timer.c, also move muldiv64() (used by the inline functions) to qemu-timer.h. Adjust block/raw-posix.c and simpletrace.c to use get_clock() directly. Remove a similar/duplicate definition in qemu-tool.c. Adjust hw/omap_clk.c to include qemu-timer.h because muldiv64() is used there. After this change, tracing can be used also for user code and simpletrace on Win32. Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-07-06savevm: Add DeviceState paramAlex Williamson
When available, we'd like to be able to access the DeviceState when registering a savevm. For buses with a get_dev_path() function, this will allow us to create more unique savevm id strings. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2010-03-29Compile qemu-timer only onceBlue Swirl
Arrange various declarations so that also non-CPU code can access them, adjust users. Move CPU specific code to cpus.c. Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2010-03-27Add a missing #include for FreeBSD hostsJuergen Lock
Signed-off-by: Juergen Lock <nox@jelal.kn-bremen.de> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2010-03-27fix race between timer firing vs. alarm_timer->pending = 0Paolo Bonzini
The period for Win32 timers is very short and always the same independent of dynticks, so it's possible that the timer fires before qemu_run_all_timers has reset alarm_timer->pending to zero. Reset alarm_timer->pending before rearming. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2010-03-17split out qemu-timer.cPaolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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