On Fri, Jan 11, 2019 at 10:12:31AM +0100, Joerg Roedel wrote: > On Thu, Jan 10, 2019 at 12:02:05PM -0500, Konrad Rzeszutek Wilk wrote: > > Why not use swiotlb_nr_tbl ? That is how drivers/gpu/drm use to figure if they > > need to limit the size of pages. > > That function just exports the overall size of the swiotlb aperture, no? > What I need here is the maximum size for a single mapping. Yes. The other drivers just assumed that if there is SWIOTLB they would use the smaller size by default (as in they knew the limitation). But I agree it would be better to have something smarter - and also convert the DRM drivers to piggy back on this. Or alternatively we could make SWIOTLB handle bigger sizes.. > > Regards, > > Joerg _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
