addmap-base-2 patch from Jon Smirl:

sets up the DRM to have the ability to have permanent maps while the driver
    is loaded...

3 files changed, 137 insertions, 34 deletions

diff --git a/linux/drmP.h b/linux/drmP.h
index 75fb999a..4271a7a2 100644
--- a/linux/drmP.h
+++ b/linux/drmP.h
@@ -831,6 +831,8 @@ extern int	     DRM(addmap)( struct inode *inode, struct file *filp,
 				  unsigned int cmd, unsigned long arg );
 extern int	     DRM(rmmap)( struct inode *inode, struct file *filp,
 				 unsigned int cmd, unsigned long arg );
+extern int 	     DRM(initmap)( drm_device_t *dev, unsigned int offset,
+				 unsigned int size, int type, int flags );
 #if __HAVE_DMA
 extern int	     DRM(addbufs)( struct inode *inode, struct file *filp,
 				   unsigned int cmd, unsigned long arg );
diff --git a/linux/drm_bufs.h b/linux/drm_bufs.h
index d3d0b83c..7ae95fcc 100644
--- a/linux/drm_bufs.h
+++ b/linux/drm_bufs.h
@@ -68,6 +68,69 @@ int DRM(order)( unsigned long size )
 	return order;
 }
 
+ /**
+ * Adjusts the memory offset to its absolute value according to the mapping
+ * type.  Adds the map to the map list drm_device::maplist. Adds MTRR's where
+ * applicable and if supported by the kernel.
+ */
+int DRM(initmap)( drm_device_t *dev, unsigned int offset, unsigned int size, int type, int flags )
+{
+	drm_map_t *map;
+	drm_map_list_t *list;
+
+	DRM_DEBUG("\n");
+
+	if ( (offset & (~PAGE_MASK)) || (size & (~PAGE_MASK)) )
+		return -EINVAL;
+#if !defined(__sparc__) && !defined(__alpha__)
+	if ( offset + size < offset || offset < virt_to_phys(high_memory) )
+		return -EINVAL;
+#endif
+	if ( !(list = DRM(alloc)( sizeof(*list), DRM_MEM_MAPS )))
+		return -ENOMEM;
+	memset(list, 0, sizeof(*list));
+		
+	if ( !(map = DRM(alloc)( sizeof(*map), DRM_MEM_MAPS ))) {
+		DRM(free)(list, sizeof(*list), DRM_MEM_MAPS);
+		return -ENOMEM;
+	}
+
+	*map = (drm_map_t){
+		.offset = offset,
+		.size = size,
+		.type = type,
+		.flags = flags,
+		.mtrr = -1,
+		.handle = 0,
+	};
+	list->map = map;
+
+	DRM_DEBUG( "initmap offset = 0x%08lx, size = 0x%08lx, type = %d\n",
+		   map->offset, map->size, map->type );
+        
+#ifdef __alpha__
+	map->offset += dev->hose->mem_space->start;
+#endif
+#if __REALLY_HAVE_MTRR
+	if ( map->type == _DRM_FRAME_BUFFER ||
+		(map->flags & _DRM_WRITE_COMBINING) ) {
+		map->mtrr = mtrr_add( map->offset, map->size,
+					MTRR_TYPE_WRCOMB, 1 );
+	}
+#endif
+	if (map->type == _DRM_REGISTERS)
+		map->handle = DRM(ioremap)( map->offset, map->size, dev );
+
+	down(&dev->struct_sem);
+	list_add(&list->head, &dev->maplist->head);
+	up(&dev->struct_sem);
+	
+	DRM_DEBUG("finished\n");
+
+	return 0;
+}
+
+
 /**
  * Ioctl to specify a range of memory that is available for mapping by a non-root process.
  *
@@ -120,7 +183,21 @@ int DRM(addmap)( struct inode *inode, struct file *filp,
 
 	switch ( map->type ) {
 	case _DRM_REGISTERS:
-	case _DRM_FRAME_BUFFER:
+	case _DRM_FRAME_BUFFER: {
+		/* after all the drivers switch to permanent mapping this should just return an error */
+        	struct list_head *_list;
+
+		/* if map already exists, return the existing one instead of creating a new one */
+		list_for_each( _list, &dev->maplist->head ) {
+			drm_map_list_t *_entry = list_entry( _list, drm_map_list_t, head );
+			if ( _entry->map && _entry->map->type == map->type ) {
+				DRM(free)( map, sizeof(*map), DRM_MEM_MAPS );
+				map = _entry->map;
+				DRM_DEBUG( "Found existing: offset = 0x%08lx, size = 0x%08lx, type = %d\n",
+					map->offset, map->size, map->type );
+				goto found_it;
+			}
+		}
 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__)
 		if ( map->offset + map->size < map->offset ||
 		     map->offset < virt_to_phys(high_memory) ) {
@@ -142,7 +219,7 @@ int DRM(addmap)( struct inode *inode, struct file *filp,
 			map->handle = DRM(ioremap)( map->offset, map->size,
 						    dev );
 		break;
-
+	}
 	case _DRM_SHM:
 		map->handle = vmalloc_32(map->size);
 		DRM_DEBUG( "%lu %d %p\n",
@@ -196,7 +273,7 @@ int DRM(addmap)( struct inode *inode, struct file *filp,
 	down(&dev->struct_sem);
 	list_add(&list->head, &dev->maplist->head);
  	up(&dev->struct_sem);
-
+found_it:
 	if ( copy_to_user( argp, map, sizeof(*map) ) )
 		return -EFAULT;
 	if ( map->type != _DRM_SHM ) {
@@ -241,7 +318,7 @@ int DRM(rmmap)(struct inode *inode, struct file *filp,
 			   sizeof(request))) {
 		return -EFAULT;
 	}
-
+	
 	down(&dev->struct_sem);
 	list = &dev->maplist->head;
 	list_for_each(list, &dev->maplist->head) {
@@ -260,6 +337,12 @@ int DRM(rmmap)(struct inode *inode, struct file *filp,
 		return -EINVAL;
 	}
 	map = r_list->map;
+	
+	/* Register and framebuffer maps are permanent */
+	if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
+		up(&dev->struct_sem);
+		return 0;
+	}
 	list_del(list);
 	DRM(free)(list, sizeof(*list), DRM_MEM_MAPS);
 
@@ -271,17 +354,7 @@ int DRM(rmmap)(struct inode *inode, struct file *filp,
 		switch (map->type) {
 		case _DRM_REGISTERS:
 		case _DRM_FRAME_BUFFER:
-#if __REALLY_HAVE_MTRR
-			if (map->mtrr >= 0) {
-				int retcode;
-				retcode = mtrr_del(map->mtrr,
-						   map->offset,
-						   map->size);
-				DRM_DEBUG("mtrr_del = %d\n", retcode);
-			}
-#endif
-			DRM(ioremapfree)(map->handle, map->size, dev);
-			break;
+			break;  /* Can't get here, make compiler happy */
 		case _DRM_SHM:
 			vfree(map->handle);
 			break;
diff --git a/linux/drm_drv.h b/linux/drm_drv.h
index 7f652e43..4b97e40c 100644
--- a/linux/drm_drv.h
+++ b/linux/drm_drv.h
@@ -275,12 +275,6 @@ static int DRM(setup)( drm_device_t *dev )
 		dev->magiclist[i].tail = NULL;
 	}
 
-	dev->maplist = DRM(alloc)(sizeof(*dev->maplist),
-				  DRM_MEM_MAPS);
-	if(dev->maplist == NULL) return -ENOMEM;
-	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;
@@ -420,17 +414,8 @@ static int DRM(takedown)( drm_device_t *dev )
 				switch ( map->type ) {
 				case _DRM_REGISTERS:
 				case _DRM_FRAME_BUFFER:
-#if __REALLY_HAVE_MTRR
-					if ( map->mtrr >= 0 ) {
-						int retcode;
-						retcode = mtrr_del( map->mtrr,
-								    map->offset,
-								    map->size );
-						DRM_DEBUG( "mtrr_del=%d\n", retcode );
-					}
-#endif
-					DRM(ioremapfree)( map->handle, map->size, dev );
-					break;
+					continue;
+					
 				case _DRM_SHM:
 					vfree(map->handle);
 					break;
@@ -457,8 +442,6 @@ static int DRM(takedown)( drm_device_t *dev )
 			list_del( list );
 			DRM(free)(r_list, sizeof(*r_list), DRM_MEM_MAPS);
  		}
-		DRM(free)(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
-		dev->maplist = NULL;
  	}
 
 #if __HAVE_DMA_QUEUE || __HAVE_MULTIPLE_DMA_QUEUES
@@ -537,6 +520,11 @@ static int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	dev->pci_func = PCI_FUNC(pdev->devfn);
 	dev->irq = pdev->irq;
 
+	dev->maplist = DRM(alloc)(sizeof(*dev->maplist), DRM_MEM_MAPS);
+	if(dev->maplist == NULL) return -ENOMEM;
+	memset(dev->maplist, 0, sizeof(*dev->maplist));
+	INIT_LIST_HEAD(&dev->maplist->head);
+
 	/* dev_priv_size can be changed by a driver in driver_register_fns */
 	dev->dev_priv_size = sizeof(u32);
 	DRM(driver_register_fns)(dev);
@@ -677,6 +665,10 @@ static int __init drm_init( void )
  */
 static void __exit drm_cleanup( drm_device_t *dev )
 {
+	drm_map_t *map;
+	drm_map_list_t *r_list;
+	struct list_head *list, *list_next;
+	
 	DRM_DEBUG( "\n" );
 	if (!dev) {
 		DRM_ERROR("cleanup called no dev\n");
@@ -685,6 +677,42 @@ static void __exit drm_cleanup( drm_device_t *dev )
 
 	DRM(takedown)(dev);
 
+	if( dev->maplist ) {
+		list_for_each_safe( list, list_next, &dev->maplist->head ) {
+			r_list = (drm_map_list_t *)list;
+
+			if ( ( map = r_list->map ) ) {
+				switch ( map->type ) {
+				case _DRM_REGISTERS:
+					DRM(ioremapfree)( map->handle, map->size, dev );
+					break;
+					
+				case _DRM_FRAME_BUFFER:
+#if __REALLY_HAVE_MTRR
+					if ( map->mtrr >= 0 ) {
+						int retcode;
+						retcode = mtrr_del( map->mtrr,
+								    map->offset,
+								    map->size );
+						DRM_DEBUG( "mtrr_del=%d\n", retcode );
+					}
+#endif
+					break;
+					
+				case _DRM_SHM:
+				case _DRM_AGP:
+				case _DRM_SCATTER_GATHER:
+					DRM_DEBUG("Extra maplist item\n");
+					break;
+				}
+				DRM(free)(map, sizeof(*map), DRM_MEM_MAPS);
+			}
+			list_del( list );
+			DRM(free)(r_list, sizeof(*r_list), DRM_MEM_MAPS);
+ 		}
+		DRM(free)(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
+		dev->maplist = NULL;
+ 	}
 	if (DRM(fb_loaded)==0)
 		pci_disable_device(dev->pdev);