GL_AMD_pinned_memory Comes To The Open-Source Radeon Driver

[phoronix]

Phoronix: GL_AMD_pinned_memory Comes To The Open-Source Radeon Driver

Marek Ol??k has implemented support for the GL_AMD_pinned_memory extension within Mesa/Gallium3D and the R600g and RadeonSI Gallium3D drivers...

http://www.phoronix.com/scan.php?page=news_item&px=OpenGL-AMD-Pinned-Memory

[peppercats]

Essential along with the extension non-AMD specific analog for high performance OGL.

[Adarion]

The link / explanation was nice. So at least I have a clue now what this is dealing with. A welcome addition.

[Kemosabe]

Finally! But i thought userptr is intel specific? Does it mean it does not work on AMD systems?
What an irony since one of AMD's APU advantages is HSA. . .

Does anybody know more?

[bridgman]

Finally! But i thought userptr is intel specific? Does it mean it does not work on AMD systems?
What an irony since one of AMD's APU advantages is HSA. . .

http://www.phoronix.com/scan.php?page=news_item&px=MTc2OTA

[Ancurio]

It's pretty neat how an extension like this can be implemented using the existing buffer object entrypoints adding only a single new binding point enum.

[agd5f]

Finally! But i thought userptr is intel specific? Does it mean it does not work on AMD systems?
What an irony since one of AMD's APU advantages is HSA. . .

Does anybody know more?

The userptr ioctls in both the radeon and intel kernel drivers just allow you to request user pages be pinned temporarily for DMA. HSA allows the GPU to access unpinned pages directly without the requirement to pin them prior to DMA access. As such you can access pageable memory directly with the help of new features in the IOMMU.

[DarkFoss]

Finally! But i thought userptr is intel specific? Does it mean it does not work on AMD systems?
What an irony since one of AMD's APU advantages is HSA. . .

Does anybody know more?

It was added awhile ago

http://www.phoronix.com/scan.php?page=news_item&px=MTgxNDA

[Kemosabe]

Thanks guys.

The userptr ioctls in both the radeon and intel kernel drivers just allow you to request user pages be pinned temporarily for DMA. HSA allows the GPU to access unpinned pages directly without the requirement to pin them prior to DMA access. As such you can access pageable memory directly with the help of new features in the IOMMU.

This answer gets an extra like!

[cb88]

The userptr ioctls in both the radeon and intel kernel drivers just allow you to request user pages be pinned temporarily for DMA. HSA allows the GPU to access unpinned pages directly without the requirement to pin them prior to DMA access. As such you can access pageable memory directly with the help of new features in the IOMMU.

Swap storming on the GPU! ... I kid I kid.