[RFC PATCH v2 17/17] WIP: drm/tegra: Implement new UAPI (submit_handle_syncpts)

[Mikko Perttunen]

On 9/9/20 4:24 AM, Dmitry Osipenko wrote:
> 09.09.2020 04:13, Dmitry Osipenko пишет:
> ...
>> How many sync points would use an average job? Maybe it should be better
>> to have the predefined array of sync points within the struct
>> drm_tegra_channel_submit?
>>
> 
> The same question regarding the commands.
> 
> Wouldn't it be a good idea to make both usrptr arrays of sync points and
> commands optional by having a small fixed-size buffers within
> drm_tegra_channel_submit? Then a majority of jobs would only need to
> copy the gather data from userspace.
> 

Sure, I'll look into it. For syncpoints, it would be usually 1 but 
sometimes 2, so maybe make it 2. For commands, at least for downstream 
it would typically be 2 (one wait and one gather). Any opinion from 
grate-driver's point of view? Not sure if there is any recommendation 
regarding the max size of IOCTL data.

Mikko