[edk2-devel] VirtIO Sound Driver (GSoC 2021)

[Andrew Fish via groups.io]

> On Mar 30, 2021, at 5:01 PM, Ethin Probst <harlydavidsen at gmail.com> wrote:
> 
> I'm wondering where exactly I should add the VirtIO sound protocol. I
> just familiarized myself with the build system and am about to test it
> by building OVMF if possible, but I'm wondering where I should
> actually put the protocol and all that stuff. Maybe there's
> documentation I've missed as well.

Ethin,

For the driver I’d match the patter of OVMF [1] and use OvmfPkg/VirtioSoundDxe/. Maybe even use one of the other drivers as a template. 

The protocol is more of a public thing. I think eventually we would like to publish the protocol in the UEFI Spec (I can help with that part) and that would mean we put the Protocol definition in MdePkg/Include/Protocol, but we don’t want to do that before it is standardized as that causes compatibility issues. So this is a “code first project” (code prototype and then contribute to the UEFI Forum for inclusion in the specification) so we need to follow some code first rules that I don’t remember of the top of my head? So why not start out the protocol definition OvmfPkg/Include/Protocol. You can also add a test application looks like you can just use the root [2] of OVMF for that. That way the project is not blocked. 

We can have a conversation on the mailing list about better places to put stuff, and it should be easy enough to move stuff around if everything else is working.

[1] find OvmfPkg  -iname '*Virtio*.inf'
OvmfPkg/VirtioPciDeviceDxe/VirtioPciDeviceDxe.inf
OvmfPkg/VirtioScsiDxe/VirtioScsi.inf
OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceLib.inf
OvmfPkg/Library/VirtioLib/VirtioLib.inf
OvmfPkg/VirtioGpuDxe/VirtioGpu.inf
OvmfPkg/VirtioBlkDxe/VirtioBlk.inf
OvmfPkg/Virtio10Dxe/Virtio10.inf
OvmfPkg/VirtioNetDxe/VirtioNet.inf
OvmfPkg/VirtioRngDxe/VirtioRng.inf

[2] /Volumes/Case/edk2-github/OvmfPkg>git grep APPLICATION -- *.inf | grep MODULE_TYPE
EnrollDefaultKeys/EnrollDefaultKeys.inf:13:  MODULE_TYPE                    = UEFI_APPLICATION

Thanks,

Andrew Fish


> 
> On 3/30/21, Ethin Probst via groups.io <http://groups.io/>
> <harlydavidsen=gmail.com at groups.io <mailto:harlydavidsen=gmail.com at groups.io>> wrote:
>> I agree. Plus, it gives me a chance to finally learn the EDK2 build
>> system and how it works! I've been working on a hobby OS as a side
>> project and, though learning from other code examples from OSes is
>> fun, I have to say that learning from the firmware code like from
>> SeaBIOS has been some of the most enlightening and interesting times
>> thus far.
>> Thanks for the link to your code, Rafael; once I get virtIO support
>> in, I can work on HDA support, though I might tackle USB support
>> second and HDA third. We'll see, but VirtIO definitely is coming
>> first.
>> 
>> As I said before, I look forward to working with all of you wonderful
>> people!
>> 
>> On 3/30/21, Rafael Rodrigues Machado <rafaelrodrigues.machado at gmail.com <mailto:rafaelrodrigues.machado at gmail.com>>
>> wrote:
>>> This would be amazing so people can continue my work related to
>>> accessibility at BIOS. Something desired by the blind people since the
>>> 90's
>>> Just for reference, this is what I have done:
>>> 
>>> https://github.com/RafaelRMachado/Msc_UefiHda_PreOs_Accessibility
>>> 
>>> Thanks
>>> Rafael
>>> 
>>> Em seg, 29 de mar de 2021 20:24, Ethin Probst <harlydavidsen at gmail.com>
>>> escreveu:
>>> 
>>>> Hello everyone,
>>>> 
>>>> This is the first time I've ever contributed to EDK2. As part of GSoC
>>>> 2021, I have submitted a proposal to implement a UEFI audio output
>>>> protocol that will utilize the VirtIO sound driver. I've already
>>>> submitted a draft proposal, and apologize if I've done things out of
>>>> order. This is my first time doing GSoC 2021, and contributing to EDK2
>>>> felt like a really fun thing to do!
>>>> 
>>>> I look forward to working with you guys on this and any future projects!
>>>> :-)
>>>> 
>>>> --
>>>> Signed,
>>>> Ethin D. Probst
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>> 
>> 
>> 
>> --
>> Signed,
>> Ethin D. Probst
>> 
>> 
>> 
>> 
>> 
>> 
> 
> 
> -- 
> Signed,
> Ethin D. Probst
> 
> 
> 



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