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PCI Hotplug ACPI device names only 3 characters long
From: |
Marcello Sylverster Bauer |
Subject: |
PCI Hotplug ACPI device names only 3 characters long |
Date: |
Tue, 5 Sep 2023 17:05:33 +0200 |
Greetings,
I'm currently working on a project to support Intel IPU6 in QEMU via
VFIO so that the guest system can access the camera. This requires
extending the ACPI device definition so that the guest knows how to
access the camera.
However, I cannot extend the PCI devices because their names are not 4
characters long and therefore do not follow the ACPI specification.
When I use '-acpitable' to include my own SSDT for the IPU6 PCI device,
it does not allow me to declare the device as an External Object because
it automatically adds padding underscores.
e.g.
Before:
```
External(_SB.PCI0.S18.SA0, DeviceObj)
```
After:
```
External(_SB.PCI0.S18_.SA0_, DeviceObj)
```
Adding the underscore padding is hard coded in iASL and also in QEMU
when parsing an ASL file. (see: build_append_nameseg())
So here are my questions:
1. Is there a solution to extend the ACPI PCI device using '-acpitable'
without having to patch iASL or QEMU?
2. Are there any plans to change the names to comply with the ACPI spec?
(e.g. use "S%.03X" format string instead)
Thanks
Marcello
- PCI Hotplug ACPI device names only 3 characters long,
Marcello Sylverster Bauer <=