On Thu, Nov 21, 2019 at 04:42:10PM +0000, Ruhl, Michael J wrote: > >-----Original Message----- > >From: Intel-gfx <intel-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Gerd > >Hoffmann > >Sent: Thursday, November 21, 2019 5:38 AM > >To: dri-devel@xxxxxxxxxxxxxxxxxxxxx > >Cc: David Airlie <airlied@xxxxxxxx>; intel-gfx@xxxxxxxxxxxxxxxxxxxxx; open list > ><linux-kernel@xxxxxxxxxxxxxxx>; Maxime Ripard <mripard@xxxxxxxxxx>; Gerd > >Hoffmann <kraxel@xxxxxxxxxx> > >Subject: [Intel-gfx] [PATCH 2/2] drm: share address space for dma bufs > > > >Use the shared address space of the drm device (see drm_open() in > >drm_file.c) for dma-bufs too. That removes a difference betweem drm > >device mmap vmas and dma-buf mmap vmas and fixes corner cases like > >unmaps not working properly. > > Hi Gerd, > > Just want to make sure I understand this... > > So unmaps will not work correctly for mappings when a driver does a > drm_vma_node_unamp()? Completely removing the mapping (aka munmap syscall) works fine. Zapping the pte's (using madvise(dontneed) for example) doesn't. > This is a day one bug? I guess so, but I'll leave that to others being active longer than me in drm hacking to answer ... cheers, Gerd _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
