win-pvdrivers

view xenvbd/xenvbd.h @ 790:467005e7f509

Big messy changes. Add grant ref tagging to better track when things go wrong (debug build only).
Fix a race in xennet that causes crashes under heavy traffic conditions on driver shutdown.
author James Harper <james.harper@bendigoit.com.au>
date Fri Mar 12 09:38:42 2010 +1100 (2010-03-12)
parents 2b2bf47e8672
children bbc6c94b9621
line source
1 /*
2 PV Drivers for Windows Xen HVM Domains
3 Copyright (C) 2007 James Harper
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License
7 as published by the Free Software Foundation; either version 2
8 of the License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 */
20 #if !defined(_XENVBD_H_)
21 #define _XENVBD_H_
23 #define DDKAPI
25 //#include <ntifs.h>
26 #include <ntddk.h>
27 #include <wdm.h>
28 #include <initguid.h>
29 #define NTSTRSAFE_LIB
30 #include <ntstrsafe.h>
32 #include <ntdddisk.h>
33 #include <srb.h>
35 #define __DRIVER_NAME "XenVbd"
37 #include <xen_windows.h>
38 #include <memory.h>
39 //#include <grant_table.h>
40 #include <event_channel.h>
41 #include <hvm/params.h>
42 #include <hvm/hvm_op.h>
43 #include <xen_public.h>
44 #include <io/ring.h>
45 #include <io/blkif.h>
47 #define XENVBD_POOL_TAG (ULONG) 'XVBD'
49 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
50 #define BLK_RING_SIZE __RING_SIZE((blkif_sring_t *)0, PAGE_SIZE)
51 #define BLK_OTHER_RING_SIZE __RING_SIZE((blkif_other_sring_t *)0, PAGE_SIZE)
53 #if defined(__x86_64__)
54 #pragma pack(push, 4)
55 #endif
56 struct blkif_other_request {
57 uint8_t operation;
58 uint8_t nr_segments;
59 blkif_vdev_t handle;
60 uint64_t id;
61 blkif_sector_t sector_number;
62 struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
63 };
64 struct blkif_other_response {
65 uint64_t id;
66 uint8_t operation;
67 int16_t status;
68 };
69 #if defined(__x86_64__)
70 #pragma pack(pop)
71 #endif
73 typedef struct blkif_other_request blkif_other_request_t;
74 typedef struct blkif_other_response blkif_other_response_t;
75 DEFINE_RING_TYPES(blkif_other, struct blkif_other_request, struct blkif_other_response);
77 typedef struct {
78 LIST_ENTRY list_entry;
79 PSCSI_REQUEST_BLOCK srb;
80 } srb_list_entry_t;
82 typedef struct {
83 blkif_request_t req;
84 PSCSI_REQUEST_BLOCK srb;
85 BOOLEAN aligned_buffer_in_use;
86 } blkif_shadow_t;
88 #define MAX_SHADOW_ENTRIES 64
89 #define SHADOW_ENTRIES min(MAX_SHADOW_ENTRIES, min(BLK_RING_SIZE, BLK_OTHER_RING_SIZE))
91 typedef enum {
92 XENVBD_DEVICETYPE_UNKNOWN,
93 XENVBD_DEVICETYPE_DISK,
94 XENVBD_DEVICETYPE_CDROM,
95 XENVBD_DEVICETYPE_CONTROLLER // Not yet used
96 } XENVBD_DEVICETYPE;
98 typedef enum {
99 XENVBD_DEVICEMODE_UNKNOWN,
100 XENVBD_DEVICEMODE_READ,
101 XENVBD_DEVICEMODE_WRITE
102 } XENVBD_DEVICEMODE;
104 #define RING_DETECT_STATE_NOT_STARTED 0
105 #define RING_DETECT_STATE_DETECT1 1
106 #define RING_DETECT_STATE_DETECT2 2
107 #define RING_DETECT_STATE_COMPLETE 3
109 struct
110 {
111 BOOLEAN inactive;
113 blkif_shadow_t shadows[MAX_SHADOW_ENTRIES];
114 USHORT shadow_free_list[MAX_SHADOW_ENTRIES];
115 USHORT shadow_free;
116 USHORT shadow_min_free;
118 PUCHAR device_base;
120 blkif_sring_t *sring;
121 evtchn_port_t event_channel;
122 ULONG *event_channel_ptr;
123 union {
124 blkif_front_ring_t ring;
125 blkif_other_front_ring_t other_ring;
126 };
127 int ring_detect_state;
128 BOOLEAN use_other;
129 BOOLEAN cached_use_other;
130 UCHAR last_sense_key;
131 UCHAR last_additional_sense_code;
132 blkif_response_t tmp_rep;
133 XENVBD_DEVICETYPE device_type;
134 XENVBD_DEVICEMODE device_mode;
135 ULONG bytes_per_sector;
136 ULONGLONG total_sectors;
137 XENPCI_VECTORS vectors;
138 PXENPCI_DEVICE_STATE device_state;
139 LIST_ENTRY srb_list;
140 grant_ref_t dump_grant_refs[BLKIF_MAX_SEGMENTS_PER_REQUEST];
141 BOOLEAN aligned_buffer_in_use;
142 PVOID aligned_buffer;
143 UCHAR aligned_buffer_data[(BLKIF_MAX_SEGMENTS_PER_REQUEST + 1) * PAGE_SIZE - 1];
144 /*
145 ULONGLONG interrupts;
146 ULONGLONG aligned_requests;
147 ULONGLONG aligned_bytes;
148 ULONGLONG unaligned_requests;
149 ULONGLONG unaligned_bytes;
150 */
151 } typedef XENVBD_DEVICE_DATA, *PXENVBD_DEVICE_DATA;
153 #endif