On Thu, 02 Sep 2021 09:11:40 +0000 Simon Ser <contact@xxxxxxxxxxx> wrote: > This can be used to create a separate DRM file description, thus > creating a new GEM handle namespace. See [1]. > > Example usage in wlroots is available at [2]. > > [1]: https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/110 > [2]: https://github.com/swaywm/wlroots/pull/3158 > Hi Simon, I have a feeling that this is a good idea, but could you explain in this commit message some real use cases where one needs a new GEM handle namespace? Not just "when you share a DRM fd between processes" but *why* you shared a DRM device fd between processes. If I have trouble remembering or figuring that out from those links, then I'm sure others have too. Thanks, pq > Signed-off-by: Simon Ser <contact@xxxxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> > Cc: Daniel Stone <daniels@xxxxxxxxxxxxx> > Cc: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxxxx> > Cc: Michel Dänzer <michel@xxxxxxxxxxx> > Cc: Emil Velikov <emil.l.velikov@xxxxxxxxx> > Cc: Keith Packard <keithp@xxxxxxxxxx> > Cc: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> > Cc: Dave Airlie <airlied@xxxxxxxxxx> > --- > drivers/gpu/drm/drm_lease.c | 39 +++++++++++++++++-------------------- > 1 file changed, 18 insertions(+), 21 deletions(-) > > diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c > index dee4f24a1808..d72c2fac0ff1 100644 > --- a/drivers/gpu/drm/drm_lease.c > +++ b/drivers/gpu/drm/drm_lease.c > @@ -489,12 +489,6 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev, > if (!drm_core_check_feature(dev, DRIVER_MODESET)) > return -EOPNOTSUPP; > > - /* need some objects */ > - if (cl->object_count == 0) { > - DRM_DEBUG_LEASE("no objects in lease\n"); > - return -EINVAL; > - } > - > if (cl->flags && (cl->flags & ~(O_CLOEXEC | O_NONBLOCK))) { > DRM_DEBUG_LEASE("invalid flags\n"); > return -EINVAL; > @@ -510,23 +504,26 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev, > > object_count = cl->object_count; > > - object_ids = memdup_user(u64_to_user_ptr(cl->object_ids), > - array_size(object_count, sizeof(__u32))); > - if (IS_ERR(object_ids)) { > - ret = PTR_ERR(object_ids); > - goto out_lessor; > - } > - > + /* Handle leased objects, if any */ > idr_init(&leases); > + if (object_count != 0) { > + object_ids = memdup_user(u64_to_user_ptr(cl->object_ids), > + array_size(object_count, sizeof(__u32))); > + if (IS_ERR(object_ids)) { > + ret = PTR_ERR(object_ids); > + idr_destroy(&leases); > + goto out_lessor; > + } > > - /* fill and validate the object idr */ > - ret = fill_object_idr(dev, lessor_priv, &leases, > - object_count, object_ids); > - kfree(object_ids); > - if (ret) { > - DRM_DEBUG_LEASE("lease object lookup failed: %i\n", ret); > - idr_destroy(&leases); > - goto out_lessor; > + /* fill and validate the object idr */ > + ret = fill_object_idr(dev, lessor_priv, &leases, > + object_count, object_ids); > + kfree(object_ids); > + if (ret) { > + DRM_DEBUG_LEASE("lease object lookup failed: %i\n", ret); > + idr_destroy(&leases); > + goto out_lessor; > + } > } > > /* Allocate a file descriptor for the lease */
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