drm/lease: debug output for lease creation

I spent a bit of time scratching heads and figuring out why the igts
don't work. Probably useful to keep this work.

Cc: Keith Packard <keithp@keithp.com>
Cc: Dave Airlie <airlied@gmail.com>
Acked-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20181102132543.16486-1-daniel.vetter@ffwll.ch

diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c
index 977f069..4cfd8fe 100644 (file)
--- a/drivers/gpu/drm/drm_lease.c
+++ b/drivers/gpu/drm/drm_lease.c
@@ -415,14 +415,17 @@ static int fill_object_idr(struct drm_device *dev,
                }
 
                if (!drm_mode_object_lease_required(objects[o]->type)) {
+                       DRM_DEBUG_KMS("invalid object for lease\n");
                        ret = -EINVAL;
                        goto out_free_objects;
                }
        }
 
        ret = validate_lease(dev, lessor_priv, object_count, objects);
-       if (ret)
+       if (ret) {
+               DRM_DEBUG_LEASE("lease validation failed\n");
                goto out_free_objects;
+       }
 
        /* add their IDs to the lease request - taking into account
           universal planes */
@@ -505,15 +508,21 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
                return -EOPNOTSUPP;
 
        /* Do not allow sub-leases */
-       if (lessor->lessor)
+       if (lessor->lessor) {
+               DRM_DEBUG_LEASE("recursive leasing not allowed\n");
                return -EINVAL;
+       }
 
        /* need some objects */
-       if (cl->object_count == 0)
+       if (cl->object_count == 0) {
+               DRM_DEBUG_LEASE("no objects in lease\n");
                return -EINVAL;
+       }
 
-       if (cl->flags && (cl->flags & ~(O_CLOEXEC | O_NONBLOCK)))
+       if (cl->flags && (cl->flags & ~(O_CLOEXEC | O_NONBLOCK))) {
+               DRM_DEBUG_LEASE("invalid flags\n");
                return -EINVAL;
+       }
 
        object_count = cl->object_count;
 
@@ -528,6 +537,7 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
                              object_count, object_ids);
        kfree(object_ids);
        if (ret) {
+               DRM_DEBUG_LEASE("lease object lookup failed: %i\n", ret);
                idr_destroy(&leases);
                return ret;
        }