On 04/14/2011 12:42 PM, Jesse Barnes wrote:
> We've already seen that apps want to monitor the display config, and
> some (like upowerd) poll for changes since we don't provide a
> notification for general mode config changes, just hotplug events. So
> add a new drm event, with CHANGE=1 set in the event, to allow for it.
>
> Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
>
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 4c95b5f..174ee64 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -1589,6 +1589,8 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
> set.fb = fb;
> ret = crtc->funcs->set_config(&set);
>
> + drm_sysfs_change_event(dev);
> +
> out:
> kfree(connector_set);
> mutex_unlock(&dev->mode_config.mutex);
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 9507204..df946d4 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -822,6 +822,8 @@ int drm_fb_helper_set_par(struct fb_info *info)
> return ret;
> }
> }
> +
> + drm_sysfs_change_event(dev);
> mutex_unlock(&dev->mode_config.mutex);
>
> if (fb_helper->delayed_hotplug) {
> diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
> index 2eee8e0..fd3af31 100644
> --- a/drivers/gpu/drm/drm_sysfs.c
> +++ b/drivers/gpu/drm/drm_sysfs.c
> @@ -467,9 +467,9 @@ EXPORT_SYMBOL(drm_sysfs_connector_remove);
> * drm_sysfs_hotplug_event - generate a DRM uevent
> * @dev: DRM device
> *
> - * Send a uevent for the DRM device specified by @dev. Currently we only
> - * set HOTPLUG=1 in the uevent environment, but this could be expanded to
> - * deal with other types of events.
> + * Send a uevent for the DRM device specified by @dev. Set HOTPLUG=1 in the
> + * event to indicate a display config change occurred, probably due to a
> + * display being added or removed.
> */
> void drm_sysfs_hotplug_event(struct drm_device *dev)
> {
> @@ -483,6 +483,24 @@ void drm_sysfs_hotplug_event(struct drm_device *dev)
> EXPORT_SYMBOL(drm_sysfs_hotplug_event);
>
> /**
> + * drm_sysfs_change_event - generate a DRM uevent indicating a display config change
> + * @dev: DRM device
> + *
> + * Send a uevent for the DRM device specified by @dev. Set CHANGE=1 to
> + * indicate that a userspace initiated display configuration change occurred.
> + */
> +void drm_sysfs_change_event(struct drm_device *dev)
> +{
> + char *event_string = "CHANGE=1";
> + char *envp[] = { event_string, NULL };
> +
> + DRM_DEBUG("generating hotplug event\n");
Should be "change event" here?
> +
> + kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
> +}
> +EXPORT_SYMBOL(drm_sysfs_change_event);
> +
> +/**
> * drm_sysfs_device_add - adds a class device to sysfs for a character driver
> * @dev: DRM device to be added
> * @head: DRM head in question
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index ad5770f..3aff8fc 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -1506,6 +1506,7 @@ extern struct class *drm_sysfs_create(struct module *owner, char *name);
> extern void drm_sysfs_destroy(void);
> extern int drm_sysfs_device_add(struct drm_minor *minor);
> extern void drm_sysfs_hotplug_event(struct drm_device *dev);
> +extern void drm_sysfs_change_event(struct drm_device *dev);
> extern void drm_sysfs_device_remove(struct drm_minor *minor);
> extern char *drm_get_connector_status_name(enum drm_connector_status status);
> extern int drm_sysfs_connector_add(struct drm_connector *connector);
>
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Consolidation -- Increasing the use of server virtualization is a top
priority.Virtualization can reduce costs, simplify management, and improve
application availability and disaster protection. Learn more about boosting
the value of server virtualization. http://p.sf.net/sfu/vmware-sfdev2dev
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