xref: /titanic_51/usr/src/uts/i86xpv/sys/balloon_impl.h (revision cf5b5989488984444a152faba2a8183a71dcf485)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #ifndef	_SYS_BALLOON_IMPL_H
27 #define	_SYS_BALLOON_IMPL_H
28 
29 #pragma ident	"%Z%%M%	%I%	%E% SMI"
30 
31 #include <sys/balloon.h>
32 #include <sys/types.h>
33 #include <vm/page.h>
34 #include <sys/xen_mmu.h>	/* to get typedef of mfn_t */
35 
36 #ifdef __cplusplus
37 extern "C" {
38 #endif
39 
40 /*
41  * This file contains interfaces for both the balloon kernel thread
42  * and the balloon driver.  The balloon device is installed under /dev/xen,
43  * and can be used with the ioctl values in balloon.h to get the balloon
44  * memory status.
45  */
46 
47 /* balloon thread declarations */
48 void balloon_init(pgcnt_t);
49 size_t balloon_values(int);
50 void balloon_drv_added(int64_t);
51 void balloon_drv_subtracted(int64_t);
52 long balloon_alloc_pages(uint_t, mfn_t *);
53 long balloon_free_pages(uint_t, mfn_t *, caddr_t, pfn_t *);
54 long balloon_replace_pages(uint_t, page_t **, uint_t, uint_t, mfn_t *);
55 
56 /* balloon driver information */
57 #define	BALLOON_MINOR		0
58 
59 /*
60  * Critical stats for the balloon thread.  All values are in pages.
61  */
62 typedef struct {
63 	pgcnt_t bln_current_pages;	/* current reservation */
64 	pgcnt_t bln_new_target;		/* target value for reservation */
65 	pgcnt_t bln_max_pages;	/* first pfn for which we don't have a page_t */
66 	pgcnt_t bln_low;	/* lowest value of reservation since boot */
67 	pgcnt_t bln_high;	/* highest value of reservation since boot */
68 	spgcnt_t bln_hv_pages;	/* number of total pages given to hypervisor */
69 	spgcnt_t bln_hard_limit;	/* domain's max-mem limit */
70 } bln_stats_t;
71 
72 #ifdef __cplusplus
73 }
74 #endif
75 
76 #endif /* _SYS_BALLOON_IMPL_H */
77