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:
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:
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
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
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 <linux/wait.h>
38 #include <asm/setup.h>
39 #include <asm/pgalloc.h>
40 #include <xen/evtchn.h>
41 #include <asm/hypervisor.h>
42 #include <xen/interface/io/blkif.h>
43 #include <xen/interface/io/ring.h>
44 #include <xen/gnttab.h>
45 #include <xen/driver_util.h>
47 #define DPRINTK(_f, _a...) \
48 pr_debug("(file=%s, line=%d) " _f, \
49 __FILE__ , __LINE__ , ## _a )
52 blkif_vdev_t handle; /* what the domain refers to this vbd as */
53 unsigned char readonly; /* Non-zero -> read-only */
54 unsigned char type; /* VDISK_xxx */
55 u32 pdevice; /* phys device that this vbd maps to */
56 struct block_device *bdev;
61 typedef struct blkif_st {
62 /* Unique identifier for this interface. */
65 /* Physical parameters of the comms window. */
68 /* Comms information. */
69 blkif_back_ring_t blk_ring;
70 struct vm_struct *blk_ring_area;
71 /* The VBD attached to this interface. */
73 /* Back pointer to the backend_info. */
74 struct backend_info *be;
76 spinlock_t blk_ring_lock;
80 struct task_struct *xenblkd;
81 unsigned int waiting_reqs;
82 request_queue_t *plug;
85 unsigned long st_print;
90 wait_queue_head_t waiting_to_free;
92 grant_handle_t shmem_handle;
93 grant_ref_t shmem_ref;
96 blkif_t *blkif_alloc(domid_t domid);
97 void blkif_disconnect(blkif_t *blkif);
98 void blkif_free(blkif_t *blkif);
99 int blkif_map(blkif_t *blkif, unsigned long shared_page, unsigned int evtchn);
101 #define blkif_get(_b) (atomic_inc(&(_b)->refcnt))
102 #define blkif_put(_b) \
104 if (atomic_dec_and_test(&(_b)->refcnt)) \
105 wake_up(&(_b)->waiting_to_free);\
109 int vbd_create(blkif_t *blkif, blkif_vdev_t vdevice, unsigned major,
110 unsigned minor, int readonly);
111 void vbd_free(struct vbd *vbd);
113 unsigned long vbd_size(struct vbd *vbd);
114 unsigned int vbd_info(struct vbd *vbd);
115 unsigned long vbd_secsize(struct vbd *vbd);
119 unsigned short nr_sects;
120 struct block_device *bdev;
121 blkif_sector_t sector_number;
124 int vbd_translate(struct phys_req *req, blkif_t *blkif, int operation);
126 void blkif_interface_init(void);
128 void blkif_xenbus_init(void);
130 irqreturn_t blkif_be_int(int irq, void *dev_id, struct pt_regs *regs);
131 int blkif_schedule(void *arg);
133 #endif /* __BLKIF__BACKEND__COMMON_H__ */