On 10/01/2014 12:26 AM, Tian, Kevin wrote:
From virtualization p.o.v, the ideal case is to run host i915 irq handler in the interrupt context, which meets all the assumption from original code. Using tasklet or other manner still has some restriction. This is a major open we'd like to hear more from you guys. Is it possible to have i915 driver to request two irq numbers: irq1 for real device and irq2 is purely faked one. vgt handler registers on irq1 and i915 hanlder registers on irq2, and then we can use self IPI to trigger irq2 when injection is required. But I'm not sure whether this is an existing feature in kernel, or need some core enhancement in irq sub-system...
Hi Kevin, Daniel, I'm so excited to know that, there is an existing feature in kernel: irq_work. Basicly it allows us to run the host i915 ISR in hardirq context prefectly, what's needed is to select CONFIG_IRQ_WORK in Kconfig :) I'll use that in the v2 patches.
Thanks Kevin
-- Thanks, Jike _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
