Hi, Emil On Fri, 2019-05-24 at 16:26 +0100, Emil Velikov wrote: > On 2019/05/24, Thomas Hellstrom wrote: > > On Fri, 2019-05-24 at 13:14 +0100, Emil Velikov wrote: > > > On 2019/05/23, Thomas Hellstrom wrote: > > > > Hi, Emil, > > > > > > > > On Wed, 2019-05-22 at 17:41 +0100, Emil Velikov wrote: > > > > > From: Emil Velikov <emil.velikov@xxxxxxxxxxxxx> > > > > > > > > > > Drop the custom ioctl io encoding check - core drm does it > > > > > for > > > > > us. > > > > > > > > I fail to see where the core does this, or do I miss something? > > > > > > drm_ioctl() allows for the encoding to be changed and attributes > > > that > > > only the > > > appropriate size is copied in/out of the kernel. > > > > > > Technically the function is more relaxed relative to the vmwgfx > > > check, yet > > > seems perfectly reasonable. > > > > > > Is there any corner-case that isn't but should be handled in > > > drm_ioctl()? > > > > I'd like to turn the question around and ask whether there's a > > reason > > we should relax the vmwgfx test? In the past it has trapped quite a > > few > > user-space errors. > > > The way I see it either: > - the check, as-is, is unnessesary, or > - it is needed, and we should do something equivalent for all of DRM > > We had a very long brainstorming session with a colleague and we > could not see > any cases where this would cause a problem. If you recall anything > concrete > please let me know - I would be more than happy to take a closer > look. If you have a good reason to drop an ioctl sanity check, I'd be perfectly happy to do it. To me, a good reason even includes "I have a non-open-source customer having problems with this check" because of reason etc. etc. as long as I have a way to evaluate those reasons and determine if they're valid or not. "No other drm driver nor the core is doing this" is NOT a valid reason to me. In particular if the check is not affecting performance. So unless you provide additional reasons to drop this check, it's a solid NAK from my side. Thanks, Thomas > > Thanks > Emil _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
