linux-kernel - [PATCH v6 0/5] add ACPI node for fw

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Date:	Wed, 27 Jan 2016 22:02:36 -0500
From:	"Gabriel L. Somlo" <somlo@....edu>
To:	gregkh@...uxfoundation.org, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, arnd@...db.de, lersek@...hat.com,
	ralf@...ux-mips.org, rmk+kernel@....linux.org.uk, eric@...olt.net,
	hanjun.guo@...aro.org, zajec5@...il.com, sudeep.holla@....com,
	agross@...eaurora.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:	qemu-devel@...gnu.org, mst@...hat.com, imammedo@...hat.com,
	peter.maydell@...aro.org, leif.lindholm@...aro.org,
	ard.biesheuvel@...aro.org, pbonzini@...hat.com, kraxel@...hat.com,
	ehabkost@...hat.com, luto@...capital.net, stefanha@...il.com,
	revol@...e.fr, matt@...eblueprint.co.uk, rth@...ddle.net
Subject: [PATCH v6 0/5] add ACPI node for fw_cfg on pc and arm

New since v5:

	- rebased on top of latest QEMU git master

Thanks,
  --Gabriel

>New since v4:
>
>	- rebased on top of Marc's DMA series
>	- drop machine compat dependency for insertion into x86/ssdt
>	  (patch 3/5), following agreement between Igor and Eduardo
>	- [mm]io register range now covers DMA register as well, if
>	  available.
>	- s/bios/firmware in doc file updates
>
>>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!
>>
>>>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      | 29 +++++++++++++++++++++++++++++
 hw/i386/pc.c              |  5 ++---
 hw/nvram/fw_cfg.c         |  4 +++-
 include/hw/i386/pc.h      |  2 ++
 include/hw/nvram/fw_cfg.h |  3 +++
 7 files changed, 63 insertions(+), 4 deletions(-)

-- 
2.4.3