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ab057781 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 _STORVSC_API_H_ | |
26 | #define _STORVSC_API_H_ | |
27 | ||
447fc67e | 28 | #include "vmbus_api.h" |
ab057781 | 29 | |
454f18a9 | 30 | /* Defines */ |
15dd1c9f | 31 | #define STORVSC_RING_BUFFER_SIZE (20*PAGE_SIZE) |
9bcd786a | 32 | #define BLKVSC_RING_BUFFER_SIZE (20*PAGE_SIZE) |
ab057781 | 33 | |
15dd1c9f | 34 | #define STORVSC_MAX_IO_REQUESTS 128 |
ab057781 | 35 | |
454f18a9 BP |
36 | /* |
37 | * In Hyper-V, each port/path/target maps to 1 scsi host adapter. In | |
38 | * reality, the path/target is not used (ie always set to 0) so our | |
39 | * scsi host adapter essentially has 1 bus with 1 target that contains | |
40 | * up to 256 luns. | |
41 | */ | |
ab057781 | 42 | #define STORVSC_MAX_LUNS_PER_TARGET 64 |
9bcd786a | 43 | #define STORVSC_MAX_TARGETS 1 |
ab057781 HJ |
44 | #define STORVSC_MAX_CHANNELS 1 |
45 | ||
0b3f6834 | 46 | struct hv_storvsc_request; |
ab057781 | 47 | |
454f18a9 | 48 | /* Matches Windows-end */ |
9f0c7d2c | 49 | enum storvsc_request_type{ |
ab057781 HJ |
50 | WRITE_TYPE, |
51 | READ_TYPE, | |
52 | UNKNOWN_TYPE, | |
9f0c7d2c | 53 | }; |
ab057781 | 54 | |
0b3f6834 | 55 | struct hv_storvsc_request { |
8a046024 HJ |
56 | enum storvsc_request_type type; |
57 | u32 host; | |
58 | u32 bus; | |
59 | u32 target_id; | |
60 | u32 lun_id; | |
61 | u8 *cdb; | |
62 | u32 cdb_len; | |
63 | u32 status; | |
64 | u32 bytes_xfer; | |
ab057781 | 65 | |
8a046024 HJ |
66 | unsigned char *sense_buffer; |
67 | u32 sense_buffer_size; | |
ab057781 | 68 | |
8a046024 | 69 | void *context; |
ab057781 | 70 | |
8a046024 | 71 | void (*on_io_completion)(struct hv_storvsc_request *request); |
ab057781 | 72 | |
454f18a9 | 73 | /* This points to the memory after DataBuffer */ |
8a046024 | 74 | void *extension; |
ab057781 | 75 | |
8a046024 | 76 | struct hv_multipage_buffer data_buffer; |
0b3f6834 | 77 | }; |
ab057781 | 78 | |
454f18a9 | 79 | /* Represents the block vsc driver */ |
9f0c7d2c | 80 | struct storvsc_driver_object { |
9bcd786a GKH |
81 | /* Must be the first field */ |
82 | /* Which is a bug FIXME! */ | |
8a046024 | 83 | struct hv_driver base; |
ab057781 | 84 | |
454f18a9 | 85 | /* Set by caller (in bytes) */ |
8a046024 | 86 | u32 ring_buffer_size; |
ab057781 | 87 | |
454f18a9 | 88 | /* Allocate this much private extension for each I/O request */ |
8a046024 | 89 | u32 request_ext_size; |
ab057781 | 90 | |
454f18a9 | 91 | /* Maximum # of requests in flight per channel/device */ |
8a046024 | 92 | u32 max_outstanding_req_per_channel; |
ab057781 | 93 | |
454f18a9 | 94 | /* Specific to this driver */ |
8a046024 HJ |
95 | int (*on_io_request)(struct hv_device *device, |
96 | struct hv_storvsc_request *request); | |
9f0c7d2c | 97 | }; |
ab057781 | 98 | |
9f0c7d2c | 99 | struct storvsc_device_info { |
8a046024 HJ |
100 | unsigned int port_number; |
101 | unsigned char path_id; | |
102 | unsigned char target_id; | |
9f0c7d2c | 103 | }; |
ab057781 | 104 | |
454f18a9 | 105 | /* Interface */ |
eb4f3e0a HJ |
106 | int stor_vsc_initialize(struct hv_driver *driver); |
107 | int stor_vsc_on_host_reset(struct hv_device *device); | |
108 | int blk_vsc_initialize(struct hv_driver *driver); | |
454f18a9 | 109 | |
454f18a9 | 110 | #endif /* _STORVSC_API_H_ */ |