> You need memory pressure, to force ttm to unmap the bo, not userspace. So > roughly > 1. create bo > 2. mmap it through drm fd, write some stuff > 3. export to dma-buf, mmap it, verify stuff is there > 4. create a pile more bo, mmap them write to them > 5. once you've thrashed all of vram enough, recheck your original bo. If > I'm right you should get the following: > - drm fd mmap still show right content > - dma-buf fd mmap shows random crap that you've written into other > buffers > > Ofc you need to make sure that an mmap actually forces the buffer into > vram. So might need a combo of modeset+mmap, to make that happen. Plain > mmap might just give you ptes that point into system memory, which is not > managed by ttm like vram. Is any move buffer good enough to trigger this, i.e. will SYSTEM -> VRAM work too? That'll be easier because all I need to do is map the buffer to a crtc to force pinning to vram, then check if the mappings are intact still ... cheers, Gerd _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
