[PATCH 03/16] drm: add support for render nodes

[Ilija Hadzic]

Add support for creating multiple render nodes on the same
physical GPU.

Patch derived from 7c5cc4f63556e351e9e5980ed22accad410e3fdc
originally authored by Dave Airlie.

Signed-off-by: Ilija Hadzic <ihadzic at research.bell-labs.com>
---
 drivers/gpu/drm/drm_crtc.c |    1 +
 drivers/gpu/drm/drm_stub.c |   32 +++++++++++++++++++++++++++++++-
 drivers/gpu/drm/drm_vm.c   |    7 +++++++
 include/drm/drmP.h         |    4 +++-
 include/drm/drm_crtc.h     |    1 +
 5 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index d2d9dc5..f081873 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -950,6 +950,7 @@ int drm_mode_group_init(struct drm_device *dev, struct drm_mode_group *group)
 	group->num_encoders = 0;
 	return 0;
 }
+EXPORT_SYMBOL(drm_mode_group_init);
 
 int drm_mode_group_init_legacy_group(struct drm_device *dev,
 				     struct drm_mode_group *group)
diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
index 6d7b083..53033d3 100644
--- a/drivers/gpu/drm/drm_stub.c
+++ b/drivers/gpu/drm/drm_stub.c
@@ -269,6 +269,7 @@ int drm_fill_in_dev(struct drm_device *dev,
 	INIT_LIST_HEAD(&dev->vmalist);
 	INIT_LIST_HEAD(&dev->maplist);
 	INIT_LIST_HEAD(&dev->vblank_event_list);
+	INIT_LIST_HEAD(&dev->render_minor_list);
 
 	spin_lock_init(&dev->count_lock);
 	spin_lock_init(&dev->event_lock);
@@ -355,6 +356,7 @@ int drm_get_minor(struct drm_device *dev, struct drm_minor **minor, int type)
 	new_minor->dev = dev;
 	new_minor->index = minor_id;
 	INIT_LIST_HEAD(&new_minor->master_list);
+	INIT_LIST_HEAD(&new_minor->render_node_list);
 
 	idr_replace(&drm_minors_idr, new_minor, minor_id);
 
@@ -398,6 +400,29 @@ err_idr:
 	return ret;
 }
 
+int drm_create_minor_render(struct drm_device *dev, struct drm_minor **minor_p)
+{
+	int ret;
+	struct drm_minor *minor;
+
+	ret = drm_get_minor(dev, &minor, DRM_MINOR_RENDER);
+	if (ret)
+		return ret;
+
+	list_add_tail(&minor->render_node_list, &dev->render_minor_list);
+	return 0;
+}
+
+int drm_destroy_minor_render(struct drm_device *dev)
+{
+	struct drm_minor *minor, *tmp;
+
+	list_for_each_entry_safe(minor, tmp, &dev->render_minor_list, render_node_list) {
+		drm_put_minor(&minor);
+	}
+	return 0;
+}
+
 /**
  * Put a secondary minor number.
  *
@@ -414,6 +439,8 @@ int drm_put_minor(struct drm_minor **minor_p)
 
 	DRM_DEBUG("release secondary minor %d\n", minor->index);
 
+	list_del(&minor->render_node_list);
+
 	if (minor->type == DRM_MINOR_LEGACY)
 		drm_proc_cleanup(minor, drm_proc_root);
 #if defined(CONFIG_DEBUG_FS)
@@ -476,9 +503,12 @@ void drm_put_dev(struct drm_device *dev)
 
 	drm_ctxbitmap_cleanup(dev);
 
-	if (drm_core_check_feature(dev, DRIVER_MODESET))
+	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		drm_put_minor(&dev->control);
 
+		drm_destroy_minor_render(dev);
+	}
+
 	if (driver->driver_features & DRIVER_GEM)
 		drm_gem_destroy(dev);
 
diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
index bcd15b0..7cf67dd 100644
--- a/drivers/gpu/drm/drm_vm.c
+++ b/drivers/gpu/drm/drm_vm.c
@@ -691,8 +691,15 @@ EXPORT_SYMBOL(drm_mmap);
 void drm_unmap_mapping(struct drm_device *dev, loff_t const holebegin,
 		       loff_t const holelen)
 {
+	struct drm_minor *minor;
 	if (dev->primary->dev_mapping)
 		unmap_mapping_range(dev->primary->dev_mapping,
 				    holebegin, holelen, 1);
+
+	list_for_each_entry(minor, &dev->render_minor_list, render_node_list) {
+		if (minor->dev_mapping)
+			unmap_mapping_range(minor->dev_mapping,
+					    holebegin, holelen, 1);
+	}
 }
 EXPORT_SYMBOL(drm_unmap_mapping);
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index eeb377a..d9eee26 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -999,6 +999,8 @@ struct drm_minor {
 	struct drm_mode_group mode_group;
 
 	struct address_space *dev_mapping;
+
+	struct list_head render_node_list;
 };
 
 /* mode specified on the command line */
@@ -1162,7 +1164,7 @@ struct drm_device {
 	unsigned int agp_buffer_token;
 	struct drm_minor *control;		/**< Control node for card */
 	struct drm_minor *primary;		/**< render type primary screen head */
-
+	struct list_head render_minor_list;
         struct drm_mode_config mode_config;	/**< Current mode config */
 
 	/** \name GEM information */
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 9595c2c..fc87b31 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -849,6 +849,7 @@ extern char *drm_get_dvi_i_select_name(int val);
 extern char *drm_get_tv_subconnector_name(int val);
 extern char *drm_get_tv_select_name(int val);
 extern void drm_fb_release(struct drm_file *file_priv);
+extern int drm_mode_group_init(struct drm_device *dev, struct drm_mode_group *group);
 extern int drm_mode_group_init_legacy_group(struct drm_device *dev, struct drm_mode_group *group);
 extern struct edid *drm_get_edid(struct drm_connector *connector,
 				 struct i2c_adapter *adapter);
-- 
1.7.8.5