28.01.2021 00:53, Mikko Perttunen пишет: > On 1/27/21 11:35 PM, Dmitry Osipenko wrote: >> 26.01.2021 05:45, Mikko Perttunen пишет: >>>> 4. Sync file shouldn't be needed for the part of DRM API which doesn't >>>> interact with external non-DRM devices. We should use DRM syncobj for >>>> everything related to DRM, it's a superior API over sync file, it's >>>> suitable for DRM scheduler. >>> >>> Considering the issues with fileno limits, I suppose there is no other >>> choice. Considering the recent NTSYNC proposal by Wine developers, maybe >>> we should also have NTHANDLEs to get rid of restrictions of file >>> descriptors. >> >> It's odd to me that you trying to avoid the existing DRM API. This all >> was solved in DRM long time ago and grate drivers have no problems with >> using the DRM APIs. Even if something is really missing, then you should >> add the missing features instead of re-inventing everything from scratch. >> > > DRM is only one of many subsystems that will have to deal with > syncpoints, so I have wanted to have a central solution instead of > reimplementing the same stuff everywhere. sync_files seem like the > "missing feature", but they are difficult to use it with the fileno > limits. But as has been said many times, they are intended only to > transfer fences between the implementations in individual drivers, so I > guess I will have to abandon this dream. Let's focus on finishing the basics first, using what we already have. Sync file + syncobj should be good enough for what we need right now. >>> DRM syncobjs may have some advantages over sync files, but >>> also disadvantages. They cannot be poll()ed, so they cannot be combined >>> with waits for other resources. >> >> I'm not sure do you mean by "poll". Sync object supports polling very >> well. >> > > I mean the poll/select etc. series of functions, which wait for file > descriptors to become ready. If there's some trick that allows syncobjs > to be used for that, then please tell. Please explain in details what problem you need to solve, give an example.
