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6b35e407 RR |
1 | #ifndef _LINUX_VIRTIO_BALLOON_H |
2 | #define _LINUX_VIRTIO_BALLOON_H | |
674bfc23 | 3 | /* This header is BSD licensed so anyone can use the definitions to implement |
a1b38387 RR |
4 | * compatible drivers/servers. |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * 3. Neither the name of IBM nor the names of its contributors | |
15 | * may be used to endorse or promote products derived from this software | |
16 | * without specific prior written permission. | |
17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. */ | |
df81b29c | 28 | #include <linux/types.h> |
8a7b19d8 | 29 | #include <linux/virtio_types.h> |
e95646c3 | 30 | #include <linux/virtio_ids.h> |
6b35e407 RR |
31 | #include <linux/virtio_config.h> |
32 | ||
6b35e407 RR |
33 | /* The feature bitmap for virtio balloon */ |
34 | #define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ | |
9564e138 | 35 | #define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */ |
5a10b7db | 36 | #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ |
86a55978 | 37 | #define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */ |
2e991629 | 38 | #define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */ |
b0c504f1 | 39 | #define VIRTIO_BALLOON_F_REPORTING 5 /* Page reporting virtqueue */ |
6b35e407 | 40 | |
1b4aa2fa HB |
41 | /* Size of a PFN in the balloon interface. */ |
42 | #define VIRTIO_BALLOON_PFN_SHIFT 12 | |
43 | ||
86a55978 WW |
44 | #define VIRTIO_BALLOON_CMD_ID_STOP 0 |
45 | #define VIRTIO_BALLOON_CMD_ID_DONE 1 | |
25e65e4e | 46 | struct virtio_balloon_config { |
6b35e407 | 47 | /* Number of pages host wants Guest to give up. */ |
c73cb10c | 48 | __le32 num_pages; |
6b35e407 | 49 | /* Number of pages we've actually got in balloon. */ |
c73cb10c | 50 | __le32 actual; |
31ba514b AD |
51 | /* |
52 | * Free page hint command id, readonly by guest. | |
53 | * Was previously named free_page_report_cmd_id so we | |
54 | * need to carry that name for legacy support. | |
55 | */ | |
56 | union { | |
c73cb10c MT |
57 | __le32 free_page_hint_cmd_id; |
58 | __le32 free_page_report_cmd_id; /* deprecated */ | |
31ba514b | 59 | }; |
2e991629 | 60 | /* Stores PAGE_POISON if page poisoning is in use */ |
c73cb10c | 61 | __le32 poison_val; |
6b35e407 | 62 | }; |
9564e138 AL |
63 | |
64 | #define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */ | |
65 | #define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */ | |
66 | #define VIRTIO_BALLOON_S_MAJFLT 2 /* Number of major faults */ | |
67 | #define VIRTIO_BALLOON_S_MINFLT 3 /* Number of minor faults */ | |
68 | #define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */ | |
69 | #define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */ | |
5057dcd0 | 70 | #define VIRTIO_BALLOON_S_AVAIL 6 /* Available memory as in /proc */ |
4d32029b | 71 | #define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */ |
6c64fe7f JH |
72 | #define VIRTIO_BALLOON_S_HTLB_PGALLOC 8 /* Hugetlb page allocations */ |
73 | #define VIRTIO_BALLOON_S_HTLB_PGFAIL 9 /* Hugetlb page allocation failures */ | |
74 | #define VIRTIO_BALLOON_S_NR 10 | |
9564e138 | 75 | |
b4000032 MT |
76 | #define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \ |
77 | VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \ | |
78 | VIRTIO_BALLOON_S_NAMES_prefix "swap-out", \ | |
79 | VIRTIO_BALLOON_S_NAMES_prefix "major-faults", \ | |
80 | VIRTIO_BALLOON_S_NAMES_prefix "minor-faults", \ | |
81 | VIRTIO_BALLOON_S_NAMES_prefix "free-memory", \ | |
82 | VIRTIO_BALLOON_S_NAMES_prefix "total-memory", \ | |
83 | VIRTIO_BALLOON_S_NAMES_prefix "available-memory", \ | |
84 | VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \ | |
85 | VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \ | |
86 | VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures" \ | |
87 | } | |
88 | ||
89 | #define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("") | |
90 | ||
df81b29c MT |
91 | /* |
92 | * Memory statistics structure. | |
93 | * Driver fills an array of these structures and passes to device. | |
94 | * | |
95 | * NOTE: fields are laid out in a way that would make compiler add padding | |
96 | * between and after fields, so we have to use compiler-specific attributes to | |
97 | * pack it, to disable this padding. This also often causes compiler to | |
98 | * generate suboptimal code. | |
99 | * | |
100 | * We maintain this statistics structure format for backwards compatibility, | |
101 | * but don't follow this example. | |
102 | * | |
103 | * If implementing a similar structure, do something like the below instead: | |
104 | * struct virtio_balloon_stat { | |
105 | * __virtio16 tag; | |
106 | * __u8 reserved[6]; | |
107 | * __virtio64 val; | |
108 | * }; | |
109 | * | |
110 | * In other words, add explicit reserved fields to align field and | |
111 | * structure boundaries at field size, avoiding compiler padding | |
112 | * without the packed attribute. | |
113 | */ | |
9564e138 | 114 | struct virtio_balloon_stat { |
df81b29c MT |
115 | __virtio16 tag; |
116 | __virtio64 val; | |
9564e138 AL |
117 | } __attribute__((packed)); |
118 | ||
6b35e407 | 119 | #endif /* _LINUX_VIRTIO_BALLOON_H */ |