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3e7ee490 HJ |
1 | /* |
2 | * | |
3 | * Copyright (c) 2009, Microsoft Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
16 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
17 | * | |
18 | * Authors: | |
19 | * Haiyang Zhang <haiyangz@microsoft.com> | |
20 | * Hank Janssen <hjanssen@microsoft.com> | |
21 | * | |
22 | */ | |
23 | ||
24 | ||
25 | #ifndef _RING_BUFFER_H_ | |
26 | #define _RING_BUFFER_H_ | |
27 | ||
b219b3f7 | 28 | #include <linux/scatterlist.h> |
3e7ee490 | 29 | |
4a1b3acc | 30 | struct hv_ring_buffer { |
3523a805 | 31 | /* Offset in bytes from the start of ring data below */ |
82f8bd40 | 32 | volatile u32 write_index; |
3523a805 GKH |
33 | |
34 | /* Offset in bytes from the start of ring data below */ | |
82f8bd40 | 35 | volatile u32 read_index; |
3e7ee490 | 36 | |
82f8bd40 | 37 | volatile u32 interrupt_mask; |
3523a805 GKH |
38 | |
39 | /* Pad it to PAGE_SIZE so that data starts on page boundary */ | |
82f8bd40 | 40 | u8 reserved[4084]; |
3523a805 GKH |
41 | |
42 | /* NOTE: | |
82f8bd40 | 43 | * The interrupt_mask field is used only for channels but since our |
3523a805 GKH |
44 | * vmbus connection also uses this data structure and its data starts |
45 | * here, we commented out this field. | |
46 | */ | |
454f18a9 | 47 | /* volatile u32 InterruptMask; */ |
3523a805 GKH |
48 | |
49 | /* | |
50 | * Ring data starts here + RingDataStartOffset | |
51 | * !!! DO NOT place any fields below this !!! | |
52 | */ | |
82f8bd40 | 53 | u8 buffer[0]; |
3c4a9413 | 54 | } __packed; |
3e7ee490 | 55 | |
8a0e1c55 | 56 | struct hv_ring_buffer_info { |
82f8bd40 HZ |
57 | struct hv_ring_buffer *ring_buffer; |
58 | u32 ring_size; /* Include the shared header */ | |
a98f96ee | 59 | spinlock_t ring_lock; |
3e7ee490 | 60 | |
82f8bd40 HZ |
61 | u32 ring_datasize; /* < ring_size */ |
62 | u32 ring_data_startoffset; | |
8a0e1c55 | 63 | }; |
3e7ee490 | 64 | |
80682b7a | 65 | struct hv_ring_buffer_debug_info { |
82f8bd40 HZ |
66 | u32 current_interrupt_mask; |
67 | u32 current_read_index; | |
68 | u32 current_write_index; | |
69 | u32 bytes_avail_toread; | |
70 | u32 bytes_avail_towrite; | |
80682b7a | 71 | }; |
3e7ee490 HJ |
72 | |
73 | ||
454f18a9 BP |
74 | |
75 | /* Interface */ | |
76 | ||
3e7ee490 | 77 | |
1ac58644 | 78 | int ringbuffer_init(struct hv_ring_buffer_info *ring_info, void *buffer, |
fc8c72eb | 79 | u32 buflen); |
3523a805 | 80 | |
1ac58644 | 81 | void ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info); |
3523a805 | 82 | |
1ac58644 | 83 | int ringbuffer_write(struct hv_ring_buffer_info *ring_info, |
3523a805 GKH |
84 | struct scatterlist *sglist, |
85 | u32 sgcount); | |
86 | ||
1ac58644 | 87 | int ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer, |
fc8c72eb | 88 | u32 buflen); |
3523a805 | 89 | |
1ac58644 | 90 | int ringbuffer_read(struct hv_ring_buffer_info *ring_info, |
fc8c72eb HZ |
91 | void *buffer, |
92 | u32 buflen, | |
93 | u32 offset); | |
3523a805 | 94 | |
1ac58644 | 95 | u32 get_ringbuffer_interrupt_mask(struct hv_ring_buffer_info *ring_info); |
3523a805 | 96 | |
1ac58644 | 97 | void dump_ring_info(struct hv_ring_buffer_info *ring_info, char *prefix); |
3523a805 | 98 | |
1ac58644 | 99 | void ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info, |
80682b7a | 100 | struct hv_ring_buffer_debug_info *debug_info); |
3e7ee490 | 101 | |
454f18a9 | 102 | #endif /* _RING_BUFFER_H_ */ |