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>

3 files changed, 54 insertions, 19 deletions

diff --git a/include/drm/drm.h b/include/drm/drm.h
index f46ba4b57da..3fb173c5af3 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -634,6 +634,9 @@ struct drm_gem_open {
 #define DRM_IOCTL_SET_SAREA_CTX         DRM_IOW( 0x1c, struct drm_ctx_priv_map)
 #define DRM_IOCTL_GET_SAREA_CTX         DRM_IOWR(0x1d, struct drm_ctx_priv_map)
 
+#define DRM_IOCTL_SET_MASTER            DRM_IO(0x1e)
+#define DRM_IOCTL_DROP_MASTER           DRM_IO(0x1f)
+
 #define DRM_IOCTL_ADD_CTX               DRM_IOWR(0x20, struct drm_ctx)
 #define DRM_IOCTL_RM_CTX                DRM_IOWR(0x21, struct drm_ctx)
 #define DRM_IOCTL_MOD_CTX               DRM_IOW( 0x22, struct drm_ctx)
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 08b8539e7b3..4c6e8298b42 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -238,11 +238,11 @@ struct drm_device;
  */
 #define LOCK_TEST_WITH_RETURN( dev, file_priv )                         \
 do {                                                                    \
-        if ( !_DRM_LOCK_IS_HELD( dev->lock.hw_lock->lock ) ||           \
-             dev->lock.file_priv != file_priv ) {                       \
+        if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock) ||                \
+            file_priv->master->lock.file_priv != file_priv)     {                       \
                 DRM_ERROR( "%s called without lock held, held  %d owner %p %p\n",\
-                           __func__, _DRM_LOCK_IS_HELD( dev->lock.hw_lock->lock ),\
-                           dev->lock.file_priv, file_priv );            \
+                           __func__, _DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock),\
+                           file_priv->master->lock.file_priv, file_priv);               \
                 return -EINVAL;                                         \
         }                                                               \
 } while (0)
@@ -379,21 +379,25 @@ struct drm_buf_entry {
 /** File private data */
 struct drm_file {
         int authenticated;
-        int master;
         pid_t pid;
         uid_t uid;
         drm_magic_t magic;
         unsigned long ioctl_count;
         struct list_head lhead;
         struct drm_minor *minor;
-        int remove_auth_on_close;
         unsigned long lock_count;
+
         /** Mapping of mm object handles to object pointers. */
         struct idr object_idr;
         /** Lock for synchronization of access to object_idr. */
         spinlock_t table_lock;
+
         struct file *filp;
         void *driver_priv;
+
+        int is_master; /* this file private is a master for a minor */
+        struct drm_master *master; /* master this node is currently associated with
+                                      N.B. not always minor->master */
 };
 
 /** Wait queue */
@@ -523,6 +527,7 @@ struct drm_map_list {
         struct drm_hash_item hash;
         struct drm_map *map;                    /**< mapping */
         uint64_t user_token;
+        struct drm_master *master;
 };
 
 typedef struct drm_map drm_local_map_t;
@@ -612,6 +617,30 @@ struct drm_gem_object {
         void *driver_private;
 };
 
+/* per-master structure */
+struct drm_master {
+
+        struct kref refcount; /* refcount for this master */
+
+        struct list_head head; /**< each minor contains a list of masters */
+        struct drm_minor *minor; /**< link back to minor we are a master for */
+
+        char *unique;                   /**< Unique identifier: e.g., busid */
+        int unique_len;                 /**< Length of unique field */
+
+        int blocked;                    /**< Blocked due to VC switch? */
+
+        /** \name Authentication */
+        /*@{ */
+        struct drm_open_hash magiclist;
+        struct list_head magicfree;
+        /*@} */
+
+        struct drm_lock_data lock;      /**< Information on hardware lock */
+
+        void *driver_priv; /**< Private structure for driver to use */
+};
+
 /**
  * DRM driver structure. This structure represent the common code for
  * a family of cards. There will one drm_device for each card present
@@ -712,6 +741,10 @@ struct drm_driver {
         void (*set_version) (struct drm_device *dev,
                              struct drm_set_version *sv);
 
+        /* Master routines */
+        int (*master_create)(struct drm_device *dev, struct drm_master *master);
+        void (*master_destroy)(struct drm_device *dev, struct drm_master *master);
+
         int (*proc_init)(struct drm_minor *minor);
         void (*proc_cleanup)(struct drm_minor *minor);
 
@@ -754,6 +787,8 @@ struct drm_minor {
         struct device kdev;             /**< Linux device */
         struct drm_device *dev;
         struct proc_dir_entry *dev_root;  /**< proc directory entry */
+        struct drm_master *master; /* currently active master for this node */
+        struct list_head master_list;
 };
 
 /**
@@ -762,13 +797,9 @@ struct drm_minor {
  */
 struct drm_device {
         struct list_head driver_item;   /**< list of devices per driver */
-        char *unique;                   /**< Unique identifier: e.g., busid */
-        int unique_len;                 /**< Length of unique field */
         char *devname;                  /**< For /proc/interrupts */
         int if_version;                 /**< Highest interface version set */
 
-        int blocked;                    /**< Blocked due to VC switch? */
-
         /** \name Locks */
         /*@{ */
         spinlock_t count_lock;          /**< For inuse, drm_device::open_count, drm_device::buf_use */
@@ -791,12 +822,7 @@ struct drm_device {
         atomic_t counts[15];
         /*@} */
 
-        /** \name Authentication */
-        /*@{ */
         struct list_head filelist;
-        struct drm_open_hash magiclist; /**< magic hash table */
-        struct list_head magicfree;
-        /*@} */
 
         /** \name Memory management */
         /*@{ */
@@ -813,7 +839,6 @@ struct drm_device {
         struct idr ctx_idr;
 
         struct list_head vmalist;       /**< List of vmas (for debugging) */
-        struct drm_lock_data lock;      /**< Information on hardware lock */
         /*@} */
 
         /** \name DMA queues (contexts) */
@@ -1192,6 +1217,13 @@ extern int drm_agp_unbind_memory(DRM_AGP_MEM * handle);
 extern void drm_agp_chipset_flush(struct drm_device *dev);
 
                                 /* Stub support (drm_stub.h) */
+extern int drm_setmaster_ioctl(struct drm_device *dev, void *data,
+                               struct drm_file *file_priv);
+extern int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
+                                struct drm_file *file_priv);
+struct drm_master *drm_master_create(struct drm_minor *minor);
+extern struct drm_master *drm_master_get(struct drm_master *master);
+extern void drm_master_put(struct drm_master **master);
 extern int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
                        struct drm_driver *driver);
 extern int drm_put_dev(struct drm_device *dev);
diff --git a/include/drm/drm_sarea.h b/include/drm/drm_sarea.h
index 480037331e4..ee5389d22c6 100644
--- a/include/drm/drm_sarea.h
+++ b/include/drm/drm_sarea.h
@@ -36,12 +36,12 @@
 
 /* SAREA area needs to be at least a page */
 #if defined(__alpha__)
-#define SAREA_MAX                       0x2000
+#define SAREA_MAX                       0x2000U
 #elif defined(__ia64__)
-#define SAREA_MAX                       0x10000 /* 64kB */
+#define SAREA_MAX                       0x10000U        /* 64kB */
 #else
 /* Intel 830M driver needs at least 8k SAREA */
-#define SAREA_MAX                       0x2000
+#define SAREA_MAX                       0x2000U
 #endif
 
 /** Maximum number of drawables in the SAREA */