On 1/9/23 5:47 AM, Jacek Lawrynowicz wrote:
Hi,
On 06.01.2023 14:29, Stanislaw Gruszka wrote:
Hi
On Thu, Jan 05, 2023 at 12:46:51PM -0600, Andrew Davis wrote:
On 12/8/22 5:07 AM, Jacek Lawrynowicz wrote:
Adds four types of GEM-based BOs for the VPU:
- shmem
- userptr
Do you have some specific need for userptr that would not
be covered by prime import + heaps? I'm just trying to get
a feel for the typical use-cases for these.
Honestly, I'm not sure. I think we have use-cases that justify
adding userptr, but have to check with our team members that
better understand the requirements.
It would be great if userptr could be replaced by dma-buf heaps.
I will add this to TODO and we will look into this after the driver is merged.
We should also be clear on the export capabilities up front
for these kinds of drivers. DRM allows re-exporting as DMA-BUF
no matter the allocation style/location which has caused issues.
Lets start accel framework with the rule that if you want a shareable
buffer you should allocate it from Heaps not the driver, then pass
it into the driver.
Merging as-is to save churn now would be fine, but it must be clear
that this is not a stable ABI just because it was allowed to be
merged. userptr/export will be removed later and should not be used
by the userspace driver.
Andrew
Regards,
Jacek
