On Thu, 1 Jul 2021 at 16:10, Matthew Auld <matthew.auld@xxxxxxxxx> wrote: > > The CPU domain should be static for discrete, and on DG1 we don't need > any flushing since everything is already coherent, so really all this > does is an object wait, for which we have an ioctl. Longer term the > desired caching should be an immutable creation time property for the > BO, which can be set with something like gem_create_ext. > > One other user is iris + userptr, which uses the set_domain to probe all > the pages to check if the GUP succeeds, however keeping the set_domain > around just for that seems rather scuffed. We could equally just submit > a dummy batch, which should hopefully be good enough, otherwise adding a > new creation time flag for userptr might be an option. Although longer > term we will also have vm_bind, which should also be a nice fit for > this, so adding a whole new flag is likely overkill. Kenneth, do you have a preference for the iris + userptr use case? Adding the flag shouldn't be much work, if you feel the dummy batch is too ugly. I don't mind either way. > > Suggested-by: Daniel Vetter <daniel@xxxxxxxx> > Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx> > Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx> > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> > Cc: Jordan Justen <jordan.l.justen@xxxxxxxxx> > Cc: Kenneth Graunke <kenneth@xxxxxxxxxxxxx> > Cc: Jason Ekstrand <jason@xxxxxxxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> > Cc: Ramalingam C <ramalingam.c@xxxxxxxxx> > --- > drivers/gpu/drm/i915/gem/i915_gem_domain.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_domain.c b/drivers/gpu/drm/i915/gem/i915_gem_domain.c > index 43004bef55cb..b684a62bf3b0 100644 > --- a/drivers/gpu/drm/i915/gem/i915_gem_domain.c > +++ b/drivers/gpu/drm/i915/gem/i915_gem_domain.c > @@ -490,6 +490,9 @@ i915_gem_set_domain_ioctl(struct drm_device *dev, void *data, > u32 write_domain = args->write_domain; > int err; > > + if (IS_DGFX(to_i915(dev))) > + return -ENODEV; > + > /* Only handle setting domains to types used by the CPU. */ > if ((write_domain | read_domains) & I915_GEM_GPU_DOMAINS) > return -EINVAL; > -- > 2.26.3 >
