irqchip fixes for Linux 5.10, take #2

- Fix Exiu driver trigger type when using ACPI
- Fix GICv3 ITS suspend/resume to use the in-kernel path
  at all times, sidestepping braindead firmware support
irqchip/gic-v3-its: Unconditionally save/restore the ITS state on suspend

On systems without HW-based collections (i.e. anything except GIC-500),
we rely on firmware to perform the ITS save/restore. This doesn't
really work, as although FW can properly save everything, it cannot
fully restore the state of the command queue (the read-side is reset
to the head of the queue). This results in the ITS consuming previously
processed commands, potentially corrupting the state.

Instead, let's always save the ITS state on suspend, disabling it in the
process, and restore the full state on resume. This saves us from broken
FW as long as it doesn't enable the ITS by itself (for which we can't do
anything).

This amounts to simply dropping the ITS_FLAGS_SAVE_SUSPEND_STATE.

Signed-off-by: Xu Qiang <xuqiang36@huawei.com>
[maz: added warning on resume, rewrote commit message]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201107104226.14282-1-xuqiang36@huawei.com
1 file changed