drm: move to kref per-master structures.

This is step one towards having multiple masters sharing a drm
device in order to get fast-user-switching to work.

It splits out the information associated with the drm master
into a separate kref counted structure, and allocates this when
a master opens the device node. It also allows the current master
to abdicate (say while VT switched), and a new master to take over
the hardware.

It moves the Intel and radeon drivers to using the sarea from
within the new master structures.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/gpu/drm/drm_proc.c b/drivers/gpu/drm/drm_proc.c
index ae73b7f7249..7dbaa1a19ea 100644
--- a/drivers/gpu/drm/drm_proc.c
+++ b/drivers/gpu/drm/drm_proc.c
@@ -195,6 +195,7 @@ static int drm_name_info(char *buf, char **start, off_t offset, int request,
                          int *eof, void *data)
 {
         struct drm_minor *minor = (struct drm_minor *) data;
+        struct drm_master *master = minor->master;
         struct drm_device *dev = minor->dev;
         int len = 0;
 
@@ -203,13 +204,16 @@ static int drm_name_info(char *buf, char **start, off_t offset, int request,
                 return 0;
         }
 
+        if (!master)
+                return 0;
+
         *start = &buf[offset];
         *eof = 0;
 
-        if (dev->unique) {
+        if (master->unique) {
                 DRM_PROC_PRINT("%s %s %s\n",
                                dev->driver->pci_driver.name,
-                               pci_name(dev->pdev), dev->unique);
+                               pci_name(dev->pdev), master->unique);
         } else {
                 DRM_PROC_PRINT("%s %s\n", dev->driver->pci_driver.name,
                                pci_name(dev->pdev));