diff options
Diffstat (limited to 'include/xen/balloon.h')
| -rw-r--r-- | include/xen/balloon.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/include/xen/balloon.h b/include/xen/balloon.h new file mode 100644 index 000000000000..fe43b0f3c86a --- /dev/null +++ b/include/xen/balloon.h @@ -0,0 +1,61 @@ +/****************************************************************************** + * balloon.h + * + * Xen balloon driver - enables returning/claiming memory to/from Xen. + * + * Copyright (c) 2003, B Dragovic + * Copyright (c) 2003-2004, M Williamson, K Fraser + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation; or, when distributed + * separately from the Linux kernel or incorporated into other + * software packages, subject to the following license: + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this source file (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, copy, modify, + * merge, publish, distribute, sublicense, and/or sell copies of the Software, + * and to permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#ifndef __XEN_BALLOON_H__ +#define __XEN_BALLOON_H__ + +#include <linux/spinlock.h> + +#if 0 +/* + * Inform the balloon driver that it should allow some slop for device-driver + * memory activities. + */ +void balloon_update_driver_allowance(long delta); + +/* Allocate/free a set of empty pages in low memory (i.e., no RAM mapped). */ +struct page **alloc_empty_pages_and_pagevec(int nr_pages); +void free_empty_pages_and_pagevec(struct page **pagevec, int nr_pages); + +void balloon_release_driver_page(struct page *page); + +/* + * Prevent the balloon driver from changing the memory reservation during + * a driver critical region. + */ +extern spinlock_t balloon_lock; +#define balloon_lock(__flags) spin_lock_irqsave(&balloon_lock, __flags) +#define balloon_unlock(__flags) spin_unlock_irqrestore(&balloon_lock, __flags) +#endif + +#endif /* __XEN_BALLOON_H__ */ |