[Qemu-devel] [PATCH v4 0/5] add ACPI node for fw_cfg on pc and arm

["Gabriel L. Somlo" <somlo@cmu.edu>]

New since v3:

	- rebased to work on top of 87e896ab (introducing pc-*-25 classes),
	  inserting fw_cfg acpi node only for machines >= 2.5.

	- reintroduce _STA with value 0x0B (bit 2 for u/i visibility turned
	  off to avoid Windows complaining -- thanks Igor for catching that!)

If there's any other feedback besides questions regarding the
appropriateness of "QEMU0002" as the value of _HID, please don't hesitate!

Thanks much,
  --Gabriel

>New since v2:
>
>	- pc/i386 node in ssdt only on machine types *newer* than 2.4
>	  (as suggested by Eduardo)
>
>I appreciate any further comments and reviews. Hopefully we can make
>this palatable for upstream, modulo the lingering concerns about whether
>"QEMU0002" is ok to use as the value of _HID, which I'll hopefully get
>sorted out with the kernel crew...
>
>>New since v1:
>>
>>	- expose control register size (suggested by Marc Marí)
>>
>>	- leaving out _UID and _STA fields (thanks Shannon & Igor)
>>
>>	- using "QEMU0002" as the value of _HID (thanks Michael)
>>
>>	- added documentation blurb to docs/specs/fw_cfg.txt
>>	  (mainly to record usage of the "QEMU0002" string with fw_cfg).
>>
>>> This series adds a fw_cfg device node to the SSDT (on pc), or to the
>>> DSDT (on arm).
>>>
>>> 	- Patch 1/3 moves (and renames) the BIOS_CFG_IOPORT (0x510)
>>> 	  define from pc.c to pc.h, so that it could be used from
>>> 	  acpi-build.c in patch 2/3.
>>> 
>>> 	- Patch 2/3 adds a fw_cfg node to the pc SSDT.
>>> 
>>> 	- Patch 3/3 adds a fw_cfg node to the arm DSDT.
>>>
>>> I made up some names - "FWCF" for the node name, and "FWCF0001"
>>> for _HID; no idea whether that's appropriate, or how else I should
>>> figure out what to use instead...
>>>
>>> Also, using scope "\\_SB", based on where fw_cfg shows up in the
>>> output of "info qtree". Again, if that's wrong, please point me in
>>> the right direction.
>>>
>>> Re. 3/3 (also mentioned after the commit blurb in the patch itself),
>>> I noticed none of the other DSDT entries contain a _STA field, wondering
>>> why it would (not) make sense to include that, same as on the PC.

Gabriel L. Somlo (5):
  fw_cfg: expose control register size in fw_cfg.h
  pc: fw_cfg: move ioport base constant to pc.h
  acpi: pc: add fw_cfg device node to ssdt
  acpi: arm: add fw_cfg device node to dsdt
  fw_cfg: document ACPI device node information

 docs/specs/fw_cfg.txt     |  9 +++++++++
 hw/arm/virt-acpi-build.c  | 15 +++++++++++++++
 hw/i386/acpi-build.c      | 23 +++++++++++++++++++++++
 hw/i386/pc.c              |  5 ++---
 hw/i386/pc_piix.c         |  1 +
 hw/i386/pc_q35.c          |  1 +
 hw/nvram/fw_cfg.c         |  8 +++++---
 include/hw/i386/pc.h      |  3 +++
 include/hw/nvram/fw_cfg.h |  3 +++
 9 files changed, 62 insertions(+), 6 deletions(-)

-- 
2.4.3