drm: add drm_dev_alloc() helper

Instead of managing device allocation+initialization in each bus-driver,
we should do that in a central place. drm_fill_in_dev() already does most
of it, but also requires the global drm lock for partial AGP device
registration.

Split both apart so we have a clean device initialization/allocation
phase, and a registration phase.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

4 files changed, 78 insertions, 57 deletions

diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
index 1f96cee6eee8..d2758be37a93 100644
--- a/drivers/gpu/drm/drm_pci.c
+++ b/drivers/gpu/drm/drm_pci.c
@@ -322,7 +322,7 @@ int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
 
         DRM_DEBUG("\n");
 
-        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+        dev = drm_dev_alloc(driver, &pdev->dev);
         if (!dev)
                 return -ENOMEM;
 
@@ -331,8 +331,6 @@ int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
                 goto err_g1;
 
         dev->pdev = pdev;
-        dev->dev = &pdev->dev;
-
         dev->pci_device = pdev->device;
         dev->pci_vendor = pdev->vendor;
 
diff --git a/drivers/gpu/drm/drm_platform.c b/drivers/gpu/drm/drm_platform.c
index f7a18c6ba4c4..fb2721738a8a 100644
--- a/drivers/gpu/drm/drm_platform.c
+++ b/drivers/gpu/drm/drm_platform.c
@@ -47,12 +47,11 @@ static int drm_get_platform_dev(struct platform_device *platdev,
 
         DRM_DEBUG("\n");
 
-        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+        dev = drm_dev_alloc(driver, &platdev->dev);
         if (!dev)
                 return -ENOMEM;
 
         dev->platformdev = platdev;
-        dev->dev = &platdev->dev;
 
         mutex_lock(&drm_global_mutex);
 
diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
index 39d864576be4..64bd52f13199 100644
--- a/drivers/gpu/drm/drm_stub.c
+++ b/drivers/gpu/drm/drm_stub.c
@@ -260,60 +260,15 @@ int drm_fill_in_dev(struct drm_device *dev,
 {
         int retcode;
 
-        INIT_LIST_HEAD(&dev->filelist);
-        INIT_LIST_HEAD(&dev->ctxlist);
-        INIT_LIST_HEAD(&dev->vmalist);
-        INIT_LIST_HEAD(&dev->maplist);
-        INIT_LIST_HEAD(&dev->vblank_event_list);
-
-        spin_lock_init(&dev->count_lock);
-        spin_lock_init(&dev->event_lock);
-        mutex_init(&dev->struct_mutex);
-        mutex_init(&dev->ctxlist_mutex);
-
-        if (drm_ht_create(&dev->map_hash, 12)) {
-                return -ENOMEM;
-        }
-
-        /* the DRM has 6 basic counters */
-        dev->counters = 6;
-        dev->types[0] = _DRM_STAT_LOCK;
-        dev->types[1] = _DRM_STAT_OPENS;
-        dev->types[2] = _DRM_STAT_CLOSES;
-        dev->types[3] = _DRM_STAT_IOCTLS;
-        dev->types[4] = _DRM_STAT_LOCKS;
-        dev->types[5] = _DRM_STAT_UNLOCKS;
-
-        dev->driver = driver;
-
         if (dev->driver->bus->agp_init) {
                 retcode = dev->driver->bus->agp_init(dev);
-                if (retcode)
-                        goto error_out_unreg;
-        }
-
-
-
-        retcode = drm_ctxbitmap_init(dev);
-        if (retcode) {
-                DRM_ERROR("Cannot allocate memory for context bitmap.\n");
-                goto error_out_unreg;
-        }
-
-        if (driver->driver_features & DRIVER_GEM) {
-                retcode = drm_gem_init(dev);
                 if (retcode) {
-                        DRM_ERROR("Cannot initialize graphics execution "
-                                  "manager (GEM)\n");
-                        goto error_out_unreg;
+                        drm_lastclose(dev);
+                        return retcode;
                 }
         }
 
         return 0;
-
-      error_out_unreg:
-        drm_lastclose(dev);
-        return retcode;
 }
 EXPORT_SYMBOL(drm_fill_in_dev);
 
@@ -490,3 +445,75 @@ void drm_unplug_dev(struct drm_device *dev)
         mutex_unlock(&drm_global_mutex);
 }
 EXPORT_SYMBOL(drm_unplug_dev);
+
+/**
+ * drm_dev_alloc - Allocate new drm device
+ * @driver: DRM driver to allocate device for
+ * @parent: Parent device object
+ *
+ * Allocate and initialize a new DRM device. No device registration is done.
+ *
+ * RETURNS:
+ * Pointer to new DRM device, or NULL if out of memory.
+ */
+struct drm_device *drm_dev_alloc(struct drm_driver *driver,
+                                 struct device *parent)
+{
+        struct drm_device *dev;
+        int ret;
+
+        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+        if (!dev)
+                return NULL;
+
+        dev->dev = parent;
+        dev->driver = driver;
+
+        INIT_LIST_HEAD(&dev->filelist);
+        INIT_LIST_HEAD(&dev->ctxlist);
+        INIT_LIST_HEAD(&dev->vmalist);
+        INIT_LIST_HEAD(&dev->maplist);
+        INIT_LIST_HEAD(&dev->vblank_event_list);
+
+        spin_lock_init(&dev->count_lock);
+        spin_lock_init(&dev->event_lock);
+        mutex_init(&dev->struct_mutex);
+        mutex_init(&dev->ctxlist_mutex);
+
+        /* the DRM has 6 basic counters */
+        dev->counters = 6;
+        dev->types[0] = _DRM_STAT_LOCK;
+        dev->types[1] = _DRM_STAT_OPENS;
+        dev->types[2] = _DRM_STAT_CLOSES;
+        dev->types[3] = _DRM_STAT_IOCTLS;
+        dev->types[4] = _DRM_STAT_LOCKS;
+        dev->types[5] = _DRM_STAT_UNLOCKS;
+
+        if (drm_ht_create(&dev->map_hash, 12))
+                goto err_free;
+
+        ret = drm_ctxbitmap_init(dev);
+        if (ret) {
+                DRM_ERROR("Cannot allocate memory for context bitmap.\n");
+                goto err_ht;
+        }
+
+        if (driver->driver_features & DRIVER_GEM) {
+                ret = drm_gem_init(dev);
+                if (ret) {
+                        DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
+                        goto err_ctxbitmap;
+                }
+        }
+
+        return dev;
+
+err_ctxbitmap:
+        drm_ctxbitmap_cleanup(dev);
+err_ht:
+        drm_ht_remove(&dev->map_hash);
+err_free:
+        kfree(dev);
+        return NULL;
+}
+EXPORT_SYMBOL(drm_dev_alloc);
diff --git a/drivers/gpu/drm/drm_usb.c b/drivers/gpu/drm/drm_usb.c
index 87664723b9ce..34ad8edfe806 100644
--- a/drivers/gpu/drm/drm_usb.c
+++ b/drivers/gpu/drm/drm_usb.c
@@ -7,18 +7,15 @@ int drm_get_usb_dev(struct usb_interface *interface,
                     struct drm_driver *driver)
 {
         struct drm_device *dev;
-        struct usb_device *usbdev;
         int ret;
 
         DRM_DEBUG("\n");
 
-        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+        dev = drm_dev_alloc(driver, &interface->dev);
         if (!dev)
                 return -ENOMEM;
 
-        usbdev = interface_to_usbdev(interface);
-        dev->usbdev = usbdev;
-        dev->dev = &interface->dev;
+        dev->usbdev = interface_to_usbdev(interface);
 
         mutex_lock(&drm_global_mutex);