DRI3 WSEGL plugin for TI SGX

DRI3 WSEGL plugin for TI SGX

[Tomi Valkeinen]

Hi All,

I have implemented a WSEGL plugin library for Imagination's PVR driver
for SGX, which allows using SGX via DRI3. In other words, it is one
piece in the puzzle of using SGX with X11.

The project is not production quality, as I have not had time to perfect
it (and, to be honest, I'm not exactly an expert on X), but now that I
finally got all the permissions to publish it, I'm doing just that to
allow other people to use it and help making it fully usable.

You can find the code and a more detailed description here:

https://github.com/TexasInstruments/dri3wsegl

Hopefully with this code now public, we can get an SGX and GC320
accelerated X11 on TI devices.

 Tomi

-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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Re: DRI3 WSEGL plugin for TI SGX

[Tony Lindgren]

* Tomi Valkeinen <tomi.valkeinen@ti.com> [180416 07:51]:
> Hi All,
> 
> I have implemented a WSEGL plugin library for Imagination's PVR driver
> for SGX, which allows using SGX via DRI3. In other words, it is one
> piece in the puzzle of using SGX with X11.
> 
> The project is not production quality, as I have not had time to perfect
> it (and, to be honest, I'm not exactly an expert on X), but now that I
> finally got all the permissions to publish it, I'm doing just that to
> allow other people to use it and help making it fully usable.
> 
> You can find the code and a more detailed description here:
> 
> https://github.com/TexasInstruments/dri3wsegl
> 
> Hopefully with this code now public, we can get an SGX and GC320
> accelerated X11 on TI devices.

Hey this is great news :)

For the dts binding, sgx binding can be generic as we can put sgx
as a child of ti-sysc. Then we just need the reset driver entry
to power up sgx. And that way we should be able to get the kernel
driver merged too even if it initially just powers and idles the
sgx. Then we can maybe recycle some of the existing PSB_RSGX32
defines in the kernel for adding (slow) 2D acceleration like
drivers/gpu/drm/gma500/accel_2d.c does..

Regards,

Tony
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Re: DRI3 WSEGL plugin for TI SGX

[Merlijn Wajer]

Hi!

On 16/04/18 16:49, Tomi Valkeinen wrote:
> Hi All,
> 
> I have implemented a WSEGL plugin library for Imagination's PVR driver
> for SGX, which allows using SGX via DRI3. In other words, it is one
> piece in the puzzle of using SGX with X11.
> 
> The project is not production quality, as I have not had time to perfect
> it (and, to be honest, I'm not exactly an expert on X), but now that I
> finally got all the permissions to publish it, I'm doing just that to
> allow other people to use it and help making it fully usable.
> 
> You can find the code and a more detailed description here:
> 
> https://github.com/TexasInstruments/dri3wsegl
> 
> Hopefully with this code now public, we can get an SGX and GC320
> accelerated X11 on TI devices.

Great, this will be fun to try.

From the README:

> Xorg's modesetting driver supports DRI3, but unfortunately only when using Glamor, which uses OpenGL for 2D acceleration. There's no OpenGL HW on TI's devices.
> 
> However, for testing purposes, it is possible to use Mesa SW rendering to fulfill the OpenGL requirement. With this this setup, SGX is used to render to a buffer, passed to the modesetting driver via DRI3, which is then composited to the screen using OpenGL SW rendering. Needless to say, the composition is very slow.
> 
> Although slow with SW rendering, modesetting driver is quite stable and the DRI3 support works fine, so it is good for testing.

There is this:

https://cgit.freedesktop.org/xorg/xserver/commit/?id=c36f56808ffbefc4a3dcf61dfad17f62aeb8e16c
https://cgit.freedesktop.org/xorg/xserver/log/glamor?id=c36f56808ffbefc4a3dcf61dfad17f62aeb8e16c
https://www.phoronix.com/scan.php?page=news_item&px=GLAMOR-GLES2-Fallback
https://cgit.freedesktop.org/xorg/xserver/tree/glamor/glamor_egl.c#n952

So actually, Glamor should already work, given a new enough X server?

This will be exciting to try out on the N900 and perhaps on the Droid 4
as well. I will try to test this in a few weeks from now. I would
personally be very happy if we can use just the modesetting driver.

On a related note, maemo leste also did some work on this for DRI2:
https://github.com/freemangordon/pvr

I think this works as a drop-in replacement on Fremantle for
pvrPVR2D_DRI2WSEGL, and can also work with newer X versions. But
dri3wsegl seems like the proper way forward here.

Cheers,
Merlijn
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Re: DRI3 WSEGL plugin for TI SGX

[Tomi Valkeinen]

On 25/04/18 12:43, Merlijn Wajer wrote:
> Hi!
> 
> On 16/04/18 16:49, Tomi Valkeinen wrote:
>> Hi All,
>>
>> I have implemented a WSEGL plugin library for Imagination's PVR driver
>> for SGX, which allows using SGX via DRI3. In other words, it is one
>> piece in the puzzle of using SGX with X11.
>>
>> The project is not production quality, as I have not had time to perfect
>> it (and, to be honest, I'm not exactly an expert on X), but now that I
>> finally got all the permissions to publish it, I'm doing just that to
>> allow other people to use it and help making it fully usable.
>>
>> You can find the code and a more detailed description here:
>>
>> https://github.com/TexasInstruments/dri3wsegl
>>
>> Hopefully with this code now public, we can get an SGX and GC320
>> accelerated X11 on TI devices.
> 
> Great, this will be fun to try.
> 
> From the README:
> 
>> Xorg's modesetting driver supports DRI3, but unfortunately only when using Glamor, which uses OpenGL for 2D acceleration. There's no OpenGL HW on TI's devices.
>>
>> However, for testing purposes, it is possible to use Mesa SW rendering to fulfill the OpenGL requirement. With this this setup, SGX is used to render to a buffer, passed to the modesetting driver via DRI3, which is then composited to the screen using OpenGL SW rendering. Needless to say, the composition is very slow.
>>
>> Although slow with SW rendering, modesetting driver is quite stable and the DRI3 support works fine, so it is good for testing.
> 
> There is this:
> 
> https://cgit.freedesktop.org/xorg/xserver/commit/?id=c36f56808ffbefc4a3dcf61dfad17f62aeb8e16c
> https://cgit.freedesktop.org/xorg/xserver/log/glamor?id=c36f56808ffbefc4a3dcf61dfad17f62aeb8e16c
> https://www.phoronix.com/scan.php?page=news_item&px=GLAMOR-GLES2-Fallback
> https://cgit.freedesktop.org/xorg/xserver/tree/glamor/glamor_egl.c#n952
> 
> So actually, Glamor should already work, given a new enough X server?

Oh, thanks for pointing this out. Indeed, Glamor might just work. I need
to try to find time to test this.

That said, I think there's still value in a separate X driver that uses
GC320 for 2D and SGX for 3D. I have no numbers, but I would expect that
combination to give much more performance than Glamor.

But for devices without GC320, Glamor sounds like the way to go. Well,
there's also a third alternative, which is to use PVR's 2D API for 2D,
instead of going through OGLES.

> This will be exciting to try out on the N900 and perhaps on the Droid 4
> as well. I will try to test this in a few weeks from now. I would
> personally be very happy if we can use just the modesetting driver.

Yep. I have no idea if this will work on OMAP3, so I'm interested to
hear about your experiences. I think the SGX driver I've been using does
not have OMAP3 support. Nikolaus has done some effort to bring the
drivers together, though.

 Tomi

-- 
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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