Re: [Qemu-devel] [PATCH 1/1] arm: virt: change GPIO trigger interrupt to pulse

[Wei Huang <wei@redhat.com>]

On 01/29/2016 04:10 AM, Shannon Zhao wrote:
> Hi，
> 
> This makes ACPI work well but makes DT not work. The reason is systemd or
> acpid open /dev/input/event0 failed. So the interrupt could be injected and
> could see under /proc/interrupts but guest doesn't have any action. I'll
> investigate why it opens failed later.

That is interesting. Could you try it with the following? This reverses
the order to down-up and worked on ACPI case.

qemu_set_irq(qdev_get_gpio_in(pl061_dev, 3), 0);
qemu_set_irq(qdev_get_gpio_in(pl061_dev, 3), 1);

Thanks,
-Wei

> 
> 2016年1月29日星期五，Wei Huang <wei@redhat.com> 写道：
> 
>> When QEMU is hook'ed up with libvirt/virsh, the first ACPI reboot
>> request will succeed; but the following shutdown/reboot requests
>> fail to trigger VMs to react. Notice that in mach-virt machine
>> model GPIO is defined as edge-triggered and active-high in ACPI.
>> This patch changes the behavior of powerdown notifier from PULLUP
>> to PULSE. It solves the problem described above (i.e. reboot
>> continues to work).
>>
>> Signed-off-by: Wei Huang <wei@redhat.com <javascript:;>>
>> ---
>>  hw/arm/virt.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
>> index 05f9087..b5468a9 100644
>> --- a/hw/arm/virt.c
>> +++ b/hw/arm/virt.c
>> @@ -546,7 +546,7 @@ static DeviceState *pl061_dev;
>>  static void virt_powerdown_req(Notifier *n, void *opaque)
>>  {
>>      /* use gpio Pin 3 for power button event */
>> -    qemu_set_irq(qdev_get_gpio_in(pl061_dev, 3), 1);
>> +    qemu_irq_pulse(qdev_get_gpio_in(pl061_dev, 3));
>>  }
>>
>>  static Notifier virt_system_powerdown_notifier = {
>> --
>> 1.8.3.1
>>
>>
>