drm_ctx_dtor.patch

Submitted by: Erdi Chen

drivers/char/drm/drmP.h

@@ -148,6 +148,7 @@
 #define DRM_MEM_CTXBITMAP 18
 #define DRM_MEM_STUB      19
 #define DRM_MEM_SGLISTS   20
+#define DRM_MEM_CTXLIST  21
 
 #define DRM_MAX_CTXBITMAP (PAGE_SIZE * 8)
 	
@@ -608,6 +609,15 @@ typedef struct drm_map_list {
 
 typedef drm_map_t drm_local_map_t;
 
+/**
+ * Context handle list
+ */
+typedef struct drm_ctx_list {
+	struct list_head	head;   /**< list head */
+	drm_context_t		handle; /**< context handle */
+	drm_file_t		*tag;   /**< associated fd private data */
+} drm_ctx_list_t;
+
 #if __HAVE_VBL_IRQ
 
 typedef struct drm_vbl_sig {
@@ -668,6 +678,12 @@ typedef struct drm_device {
 	drm_map_list_t	  *maplist;	/**< Linked list of regions */
 	int		  map_count;	/**< Number of mappable regions */
 
+	/** \name Context handle management */
+	/*@{*/
+	drm_ctx_list_t	  *ctxlist;	/**< Linked list of context handles */
+	int		  ctx_count;	/**< Number of context handles */
+	struct semaphore  ctxlist_sem;	/**< For ctxlist */
+
 	drm_map_t	  **context_sareas; /**< per-context SAREA's */
 	int		  max_context;
 

drivers/char/drm/drm_context.h

@@ -401,6 +401,7 @@ int DRM(addctx)( struct inode *inode, struct file *filp,
 {
 	drm_file_t *priv = filp->private_data;
 	drm_device_t *dev = priv->dev;
+	drm_ctx_list_t * ctx_entry;
 	drm_ctx_t ctx;
 
 	if ( copy_from_user( &ctx, (drm_ctx_t *)arg, sizeof(ctx) ) )
@@ -421,6 +422,20 @@ int DRM(addctx)( struct inode *inode, struct file *filp,
 	if ( ctx.handle != DRM_KERNEL_CONTEXT )
 		DRIVER_CTX_CTOR(ctx.handle); /* XXX: also pass dev ? */
 #endif
+	ctx_entry = DRM(alloc)( sizeof(*ctx_entry), DRM_MEM_CTXLIST );
+	if ( !ctx_entry ) {
+		DRM_DEBUG("out of memory\n");
+		return -ENOMEM;
+	}
+
+	INIT_LIST_HEAD( &ctx_entry->head );
+	ctx_entry->handle = ctx.handle;
+	ctx_entry->tag = priv;
+
+	down( &dev->ctxlist_sem );
+	list_add( &ctx_entry->head, &dev->ctxlist->head );
+	++dev->ctx_count;
+	up( &dev->ctxlist_sem );
 
 	if ( copy_to_user( (drm_ctx_t *)arg, &ctx, sizeof(ctx) ) )
 		return -EFAULT;
@@ -543,6 +558,20 @@ int DRM(rmctx)( struct inode *inode, struct file *filp,
 		DRM(ctxbitmap_free)( dev, ctx.handle );
 	}
 
+	down( &dev->ctxlist_sem );
+	if ( !list_empty( &dev->ctxlist->head ) ) {
+		drm_ctx_list_t *pos, *n;
+
+		list_for_each_entry_safe( pos, n, &dev->ctxlist->head, head ) {
+			if ( pos->handle == ctx.handle ) {
+				list_del( &pos->head );
+				DRM(free)( pos, sizeof(*pos), DRM_MEM_CTXLIST );
+				--dev->ctx_count;
+			}
+		}
+	}
+	up( &dev->ctxlist_sem );
+
 	return 0;
 }
 

drivers/char/drm/drm_drv.h

@@ -329,6 +329,12 @@ static int DRM(setup)( drm_device_t *dev )
 	memset(dev->maplist, 0, sizeof(*dev->maplist));
 	INIT_LIST_HEAD(&dev->maplist->head);
 
+	dev->ctxlist = DRM(alloc)(sizeof(*dev->ctxlist),
+				  DRM_MEM_CTXLIST);
+	if(dev->ctxlist == NULL) return -ENOMEM;
+	memset(dev->ctxlist, 0, sizeof(*dev->ctxlist));
+	INIT_LIST_HEAD(&dev->ctxlist->head);
+
 	dev->vmalist = NULL;
 	dev->sigdata.lock = dev->lock.hw_lock = NULL;
 	init_waitqueue_head( &dev->lock.lock_queue );
@@ -567,6 +573,7 @@ static int DRM(probe)(struct pci_dev *pdev)
 	dev->count_lock = SPIN_LOCK_UNLOCKED;
 	init_timer( &dev->timer );
 	sema_init( &dev->struct_sem, 1 );
+	sema_init( &dev->ctxlist_sem, 1 );
 
 	if ((dev->minor = DRM(stub_register)(DRIVER_NAME, &DRM(fops),dev)) < 0)
 		return -EPERM;
@@ -894,6 +901,26 @@ int DRM(release)( struct inode *inode, struct file *filp )
 
 	DRM(fasync)( -1, filp, 0 );
 
+	down( &dev->ctxlist_sem );
+	if ( !list_empty( &dev->ctxlist->head ) ) {
+		drm_ctx_list_t *pos, *n;
+
+		list_for_each_entry_safe( pos, n, &dev->ctxlist->head, head ) {
+			if ( pos->tag == priv &&
+			     pos->handle != DRM_KERNEL_CONTEXT ) {
+#ifdef DRIVER_CTX_DTOR
+				DRIVER_CTX_DTOR(pos->handle);
+#endif
+#if __HAVE_CTX_BITMAP
+				DRM(ctxbitmap_free)( dev, pos->handle );
+#endif
+				list_del( &pos->head );
+				DRM(free)( pos, sizeof(*pos), DRM_MEM_CTXLIST );
+			}
+		}
+	}
+	up( &dev->ctxlist_sem );
+
 	down( &dev->struct_sem );
 	if ( priv->remove_auth_on_close == 1 ) {
 		drm_file_t *temp = dev->file_first;

drivers/char/drm/drm_memory_debug.h

@@ -67,6 +67,7 @@ static drm_mem_stats_t	  DRM(mem_stats)[]   = {
 	[DRM_MEM_TOTALAGP]  = { "totalagp" },
 	[DRM_MEM_BOUNDAGP]  = { "boundagp" },
 	[DRM_MEM_CTXBITMAP] = { "ctxbitmap"},
+	[DRM_MEM_CTXLIST]   = { "ctxlist"  },
 	[DRM_MEM_STUB]      = { "stub"     },
 	{ NULL, 0, }		/* Last entry must be null */
 };