DMA-BUF Cross-Device Synchronization Hits Linux 3.17

[haagch]

Any update on the userspace drivers? Playing with PRIME is still not an option for any halfway serious gamer. Just look at this: https://imgur.com/a/z042B
It's far too jarring and distracting having this stuff and the images don't even show the flickering of old frames that's happening all the time. If your brain picks up the wrong frames it's practically impossible to aim properly.

[gilboa]

Nvidia uses a shim to access dma-buf.

PRIME offloading works just fine with the proprietary driver.

Thanks.

[LLStarks]

Was DMA-BUF symbols GPL only?
... Goes to check.
Yep: All the symbols I see are still EXPORT_SYMBOL_GPL making them invisible to any proprietary drivers.

- Gilboa

Nvidia uses a shim to access dma-buf.

PRIME offloading works just fine with the proprietary driver.

[gilboa]

It will be usable by all the drivers using prime. NVIDIA's driver included.

Was DMA-BUF symbols GPL only?
... Goes to check.
Yep: All the symbols I see are still EXPORT_SYMBOL_GPL making them invisible to any proprietary drivers.

- Gilboa

[LLStarks]

I thought Canonical didn't work with upstream? /s

The irony is that this won't land in Ubuntu 14.10 which will use the 3.16 kernel.

Unless Maarten plans to backport.

This has been a long time coming. I was on my previous laptop with Optimus chatting up Maarten on IRC almost year ago about the tearing and technical challenges that were involved in getting this right.

Any driver that uses PRIME, including radeon, will benefit from this; even my current PowerXpress/Enduro laptop. This isn't only for Nvidia.

[rikkinho]

another lie

I thought Canonical didn't work with upstream? /s

another myth make by the ppl anti canonical, they want and need a good optimus support in ubuntu

[ChrisXY]

There's still need for code in all kernel drivers to make use of this api.

Okay, thanks.

I hope they make it into 3.17.

[fedoob]

I thought Canonical didn't work with upstream? /s

[mannerov]

It seems only the api is in.

There's still need for code in all kernel drivers to make use of this api.

[ChrisXY]

Do you have to enable it somehow? Unreal Engine 4 demos still don't look like they are properly synchronized...