DRM: add mode setting support

Add mode setting support to the DRM layer.

This is a fairly big chunk of work that allows DRM drivers to provide
full output control and configuration capabilities to userspace.  It was
motivated by several factors:
  - the fb layer's APIs aren't suited for anything but simple
    configurations
  - coordination between the fb layer, DRM layer, and various userspace
    drivers is poor to non-existent (radeonfb excepted)
  - user level mode setting drivers makes displaying panic & oops
    messages more difficult
  - suspend/resume of graphics state is possible in many more
    configurations with kernel level support

This commit just adds the core DRM part of the mode setting APIs.
Driver specific commits using these new structure and APIs will follow.

Co-authors: Jesse Barnes <jbarnes@virtuousgeek.org>, Jakob Bornecrantz <jakob@tungstengraphics.com>
Contributors: Alan Hourihane <alanh@tungstengraphics.com>, Maarten Maathuis <madman2003@gmail.com>

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 27 insertions, 3 deletions

diff --git a/drivers/gpu/drm/drm_stub.c b/drivers/gpu/drm/drm_stub.c
index ea7f9e5d47fa..5ca132afa4f2 100644
--- a/drivers/gpu/drm/drm_stub.c
+++ b/drivers/gpu/drm/drm_stub.c
@@ -57,6 +57,14 @@ static int drm_minor_get_id(struct drm_device *dev, int type)
         int ret;
         int base = 0, limit = 63;
 
+        if (type == DRM_MINOR_CONTROL) {
+                base += 64;
+                limit = base + 127;
+        } else if (type == DRM_MINOR_RENDER) {
+                base += 128;
+                limit = base + 255;
+        }
+
 again:
         if (idr_pre_get(&drm_minors_idr, GFP_KERNEL) == 0) {
                 DRM_ERROR("Out of memory expanding drawable idr\n");
@@ -362,12 +370,28 @@ int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
                 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
                 goto err_g2;
         }
+
+        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+                ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
+                if (ret)
+                        goto err_g2;
+        }
+
         if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
-                goto err_g2;
+                goto err_g3;
 
-        if (dev->driver->load)
-                if ((ret = dev->driver->load(dev, ent->driver_data)))
+        if (dev->driver->load) {
+                ret = dev->driver->load(dev, ent->driver_data);
+                if (ret)
                         goto err_g3;
+        }
+
+        /* setup the grouping for the legacy output */
+        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+                ret = drm_mode_group_init_legacy_group(dev, &dev->primary->mode_group);
+                if (ret)
+                        goto err_g3;
+        }
 
         list_add_tail(&dev->driver_item, &driver->device_list);