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From: | Shlomo Pongratz |
Subject: | Re: [Qemu-devel] [PATCH RFC V5 6/9] hw/intc: arm_gicv3_spi_its |
Date: | Wed, 21 Oct 2015 17:35:44 +0300 |
Hello!
> As far as I understand Figure 1 in GICv3 architecture document the interrupts from device goes to the distributor and from it to the
> re-distributors or from the deices via the ITS to the re-distributors.
> So eventually ITS should be part of the GIC. That is if the ITS is a different entity how do you see it work with the rest of the GIC?
Easy. As i said before, what ITS actually does is transforming device ID + event ID into a single LPI number. Then, an LPI goes to the redistributor. Therefore, all we need from GIC is a method like inject_lpi(int lpi). Well, may be a couple more, for moving LPIs between collections. But this is not a problem and makes up a nice interface.
Even on the picture you mentioned ITS is a kind of separate thing. It can even be completely missing.
Well, my reasons end here. If you still disagree... Do what you want then, it will not be a problem to remove these unused stubs.
Peter, we are summoning you. :)
Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia
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