drm/lease: Send a distinct uevent

commit ce85882860f0e756f7066cbda1c43e8b50b73ab6 upstream.

Sending the exact same hotplug event is not great uapi. Luckily the
only already merged implementation of leases (in the -modesetting
driver) doesn't care about what kind of uevent it gets, and
unconditionally processes both hotplug and lease changes. So we can
still adjust the uapi here.

But e.g. weston tries to filter stuff, and I guess others might want
to do that too. Try to make that possible. Cc: stable since it's uapi
adjustement that we want to roll out everywhere.

Michel Dänzer mentioned on irc that -amdgpu also has lease support. It
has the same code flow as -modesetting though, so we can still go
ahead.

v2: Mention -amdgpu (Michel)

Cc: Keith Packard <keithp@keithp.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181129094226.30591-1-daniel.vetter@ffwll.ch
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h
index 40179c5..8750f3f 100644 (file)
--- a/drivers/gpu/drm/drm_internal.h
+++ b/drivers/gpu/drm/drm_internal.h
@@ -99,6 +99,8 @@ struct device *drm_sysfs_minor_alloc(struct drm_minor *minor);
 int drm_sysfs_connector_add(struct drm_connector *connector);
 void drm_sysfs_connector_remove(struct drm_connector *connector);
 
+void drm_sysfs_lease_event(struct drm_device *dev);
+
 /* drm_gem.c */
 int drm_gem_init(struct drm_device *dev);
 void drm_gem_destroy(struct drm_device *dev);

diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c
index b82da96..fe6bfaf 100644 (file)
--- a/drivers/gpu/drm/drm_lease.c
+++ b/drivers/gpu/drm/drm_lease.c
@@ -296,7 +296,7 @@ void drm_lease_destroy(struct drm_master *master)
 
        if (master->lessor) {
                /* Tell the master to check the lessee list */
-               drm_sysfs_hotplug_event(dev);
+               drm_sysfs_lease_event(dev);
                drm_master_put(&master->lessor);
        }
 

diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index b3c1daa..ecb7b33 100644 (file)
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -301,6 +301,16 @@ void drm_sysfs_connector_remove(struct drm_connector *connector)
        connector->kdev = NULL;
 }
 
+void drm_sysfs_lease_event(struct drm_device *dev)
+{
+       char *event_string = "LEASE=1";
+       char *envp[] = { event_string, NULL };
+
+       DRM_DEBUG("generating lease event\n");
+
+       kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
+}
+
 /**
  * drm_sysfs_hotplug_event - generate a DRM uevent
  * @dev: DRM device