DRM_TEGRA_SUBMIT_BUF_WRITE_RELOC

[Mikko Perttunen]

On 9/9/20 2:45 AM, Dmitry Osipenko wrote:
> 05.09.2020 13:34, Mikko Perttunen пишет:
> ...
>> +/* Submission */
>> +
>> +/** Patch address of the specified mapping in the submitted gather. */
>> +#define DRM_TEGRA_SUBMIT_BUF_WRITE_RELOC		(1<<0)
> 
> Shouldn't the kernel driver be aware about what relocations need to be
> patched? Could you please explain the purpose of this flag?
> 

Sure, the kernel knows if it returned the IOVA to the user or not, so we 
could remove this flag and determine it implicitly. I don't think there 
is much harm in it though; if we have the flag an application can decide 
to ignore the iova field and just pass WRITE_RELOC always, and it's not 
really any extra code on kernel side.

Mikko