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authorDaniel Vetter <daniel.vetter@ffwll.ch>2016-12-14 00:23:18 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2016-12-14 00:23:18 +0300
commit010f5b9f0d44f73943e0b63d7f4362af227ae2ea (patch)
tree4dc737ec6bda0af04098ecaa5d1863780fcdd6e6 /drivers/gpu/drm/drm_drv.c
parentde7b6be7f3009fef47a2ca0df237a055147b6d25 (diff)
parent2cf026ae85c42f253feb9f420d1b4bc99bd5503d (diff)
downloadlinux-010f5b9f0d44f73943e0b63d7f4362af227ae2ea.tar.xz
Merge tag 'drm-for-v4.10' of git://people.freedesktop.org/~airlied/linux into drm-misc-next
Main pull request for drm for 4.10 kernel - resync drm-misc with full 4.10 state (2 new drivers) so that we can start pulling in all the refactorings for 4.11! Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Diffstat (limited to 'drivers/gpu/drm/drm_drv.c')
-rw-r--r--drivers/gpu/drm/drm_drv.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 4ec61ac27477..4a7b3e98d586 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -650,6 +650,62 @@ void drm_dev_unref(struct drm_device *dev)
}
EXPORT_SYMBOL(drm_dev_unref);
+static int create_compat_control_link(struct drm_device *dev)
+{
+ struct drm_minor *minor;
+ char *name;
+ int ret;
+
+ if (!drm_core_check_feature(dev, DRIVER_MODESET))
+ return 0;
+
+ minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
+ if (!minor)
+ return 0;
+
+ /*
+ * Some existing userspace out there uses the existing of the controlD*
+ * sysfs files to figure out whether it's a modeset driver. It only does
+ * readdir, hence a symlink is sufficient (and the least confusing
+ * option). Otherwise controlD* is entirely unused.
+ *
+ * Old controlD chardev have been allocated in the range
+ * 64-127.
+ */
+ name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64);
+ if (!name)
+ return -ENOMEM;
+
+ ret = sysfs_create_link(minor->kdev->kobj.parent,
+ &minor->kdev->kobj,
+ name);
+
+ kfree(name);
+
+ return ret;
+}
+
+static void remove_compat_control_link(struct drm_device *dev)
+{
+ struct drm_minor *minor;
+ char *name;
+
+ if (!drm_core_check_feature(dev, DRIVER_MODESET))
+ return;
+
+ minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
+ if (!minor)
+ return;
+
+ name = kasprintf(GFP_KERNEL, "controlD%d", minor->index);
+ if (!name)
+ return;
+
+ sysfs_remove_link(minor->kdev->kobj.parent, name);
+
+ kfree(name);
+}
+
/**
* drm_dev_register - Register DRM device
* @dev: Device to register
@@ -688,6 +744,10 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags)
if (ret)
goto err_minors;
+ ret = create_compat_control_link(dev);
+ if (ret)
+ goto err_minors;
+
if (dev->driver->load) {
ret = dev->driver->load(dev, flags);
if (ret)
@@ -701,6 +761,7 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags)
goto out_unlock;
err_minors:
+ remove_compat_control_link(dev);
drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
drm_minor_unregister(dev, DRM_MINOR_RENDER);
drm_minor_unregister(dev, DRM_MINOR_CONTROL);
@@ -741,6 +802,7 @@ void drm_dev_unregister(struct drm_device *dev)
list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
drm_legacy_rmmap(dev, r_list->map);
+ remove_compat_control_link(dev);
drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
drm_minor_unregister(dev, DRM_MINOR_RENDER);
drm_minor_unregister(dev, DRM_MINOR_CONTROL);