ia64/linux-2.6.18-xen.hg

view drivers/xen/blktap/common.h @ 663:035670ec617c

blktap: Fix Reconnect demand by Frontend

Signed-off-by: Tomonari Horikoshi <t.horikoshi@jp.fujitsu.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Sep 09 15:13:29 2008 +0100 (2008-09-09)
parents a533be77c572
children
line source
1 /*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License version 2
4 * as published by the Free Software Foundation; or, when distributed
5 * separately from the Linux kernel or incorporated into other
6 * software packages, subject to the following license:
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this source file (the "Software"), to deal in the Software without
10 * restriction, including without limitation the rights to use, copy, modify,
11 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
12 * and to permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * IN THE SOFTWARE.
25 */
27 #ifndef __BLKIF__BACKEND__COMMON_H__
28 #define __BLKIF__BACKEND__COMMON_H__
30 #include <linux/version.h>
31 #include <linux/module.h>
32 #include <linux/interrupt.h>
33 #include <linux/slab.h>
34 #include <linux/blkdev.h>
35 #include <linux/vmalloc.h>
36 #include <asm/io.h>
37 #include <asm/setup.h>
38 #include <asm/pgalloc.h>
39 #include <xen/evtchn.h>
40 #include <asm/hypervisor.h>
41 #include <xen/blkif.h>
42 #include <xen/gnttab.h>
43 #include <xen/driver_util.h>
45 #define DPRINTK(_f, _a...) pr_debug("(file=%s, line=%d) " _f, \
46 __FILE__ , __LINE__ , ## _a )
48 #define WPRINTK(fmt, args...) printk(KERN_WARNING "blk_tap: " fmt, ##args)
50 struct backend_info;
52 typedef struct blkif_st {
53 /* Unique identifier for this interface. */
54 domid_t domid;
55 unsigned int handle;
56 /* Physical parameters of the comms window. */
57 unsigned int irq;
58 /* Comms information. */
59 enum blkif_protocol blk_protocol;
60 blkif_back_rings_t blk_rings;
61 struct vm_struct *blk_ring_area;
62 /* Back pointer to the backend_info. */
63 struct backend_info *be;
64 /* Private fields. */
65 spinlock_t blk_ring_lock;
66 atomic_t refcnt;
68 wait_queue_head_t wq;
69 struct task_struct *xenblkd;
70 unsigned int waiting_reqs;
71 request_queue_t *plug;
73 /* statistics */
74 unsigned long st_print;
75 int st_rd_req;
76 int st_wr_req;
77 int st_oo_req;
78 int st_rd_sect;
79 int st_wr_sect;
81 wait_queue_head_t waiting_to_free;
83 grant_handle_t shmem_handle;
84 grant_ref_t shmem_ref;
86 int dev_num;
87 uint64_t sectors;
88 } blkif_t;
90 blkif_t *tap_alloc_blkif(domid_t domid);
91 void tap_blkif_free(blkif_t *blkif);
92 void tap_blkif_kmem_cache_free(blkif_t *blkif);
93 int tap_blkif_map(blkif_t *blkif, unsigned long shared_page,
94 unsigned int evtchn);
95 void tap_blkif_unmap(blkif_t *blkif);
97 #define blkif_get(_b) (atomic_inc(&(_b)->refcnt))
98 #define blkif_put(_b) \
99 do { \
100 if (atomic_dec_and_test(&(_b)->refcnt)) \
101 wake_up(&(_b)->waiting_to_free);\
102 } while (0)
105 struct phys_req {
106 unsigned short dev;
107 unsigned short nr_sects;
108 struct block_device *bdev;
109 blkif_sector_t sector_number;
110 };
112 void tap_blkif_interface_init(void);
114 void tap_blkif_xenbus_init(void);
116 irqreturn_t tap_blkif_be_int(int irq, void *dev_id, struct pt_regs *regs);
117 int tap_blkif_schedule(void *arg);
119 int dom_to_devid(domid_t domid, int xenbus_id, blkif_t *blkif);
120 void signal_tapdisk(int idx);
122 #endif /* __BLKIF__BACKEND__COMMON_H__ */