On Wed, 3 Jul 2019 07:45:32 -0600 Rob Herring <robh+dt@xxxxxxxxxx> wrote: > On Wed, Jul 3, 2019 at 7:34 AM Boris Brezillon > <boris.brezillon@xxxxxxxxxxxxx> wrote: > > > > Exported BOs might be imported back, then mmap()-ed to be written > > too. Most drivers handle that by mmap()-ing the GEM handle after it's > > been imported, but, according to [1], this is illegal. > > It's not illegal, but is supposed to go thru the dmabuf mmap > functions. That's basically what I'm proposing here, just didn't post the patch skipping the GET_OFFSET step and doing the mmap() on the dmabuf FD instead of the DRM-node one, but I have it working for panfrost. > However, none of the driver I've looked at (etnaviv, msm, > v3d, vgem) do that. It probably works because it's the same driver > doing the import and export or both drivers have essentially the same > implementations. Yes, but maybe that's something we should start fixing if mmap()-ing the dmabuf is the recommended solution. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
