[PATCH v3 3/8] VFIO: platform: forwarded state tested when selecting IRQ handler
From: Christoffer Dall <hidden>
Date: 2014-11-30 12:47:34
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kvm, lkml
The subject reads strangely, perhaps just: VFIO: platform: test forward state when selecting IRQ handler On Sun, Nov 23, 2014 at 07:35:55PM +0100, Eric Auger wrote:
In case the IRQ is forwarded, the VFIO platform IRQ handler does not need to disable the IRQ anymore. When setting the IRQ handler we now also test the forwarded state. In case the IRQ is forwarded we select the edge handler (no automaske). Signed-off-by: Eric Auger <redacted> --- v2 -> v3: - forwarded state was tested in the handler. Now the forwarded state is tested before setting the handler. This definitively limits the dynamics of forwarded state changes but I don't think there is a use case where we need to be able to change the state at any time.
user space can change this by calling the VFIO_IRQ_SET_ACTION_TRIGGER whenever it wants, right?
quoted hunk ↗ jump to hunk
--- drivers/vfio/platform/vfio_platform_irq.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c index 08d400e..61a2920 100644 --- a/drivers/vfio/platform/vfio_platform_irq.c +++ b/drivers/vfio/platform/vfio_platform_irq.c@@ -230,8 +230,13 @@ static int vfio_platform_set_irq_trigger(struct vfio_platform_device *vdev, { struct vfio_platform_irq *irq = &vdev->irqs[index]; irq_handler_t handler; + struct irq_data *d; + bool is_forwarded; - if (vdev->irqs[index].flags & VFIO_IRQ_INFO_MASKABLE) + d = irq_get_irq_data(irq->hwirq); + is_forwarded = irqd_irq_forwarded(d); + + if ((vdev->irqs[index].flags & VFIO_IRQ_INFO_MASKABLE) && !is_forwarded) handler = vfio_maskable_irq_handler; else handler = vfio_irq_handler;-- 1.9.1