Re: [RFC 0/3] try to solve the DMA to MMIO issue

[Peter Maydell]

On Thu, 3 Sep 2020 at 12:24, Li Qiang <liq3ea@gmail.com> wrote:
> Peter Maydell <peter.maydell@linaro.org> 于2020年9月3日周四 下午7:19写道：
> > No. Any device can have an inbound or outbound qemu_irq line.
> > We use them not just for actual IRQ lines but for any
> > situation where we need to pass an on-or-off signal from
> > one device to another.
>
> Could you please provide some example, I haven't noticed this before.

Look at any device that calls qdev_init_gpio_in() or
qdev_init_gpio_in_named() for an example of inbound signals.
Outbound signals might be created via qdev_init_gpio_out(),
qdev_init_gpio_out_named() or sysbus_init_irq().

thanks
-- PMM