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4 * as published by the Free Software Foundation; or, when distributed
5 * separately from the Linux kernel or incorporated into other
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9 * of this source file (the "Software"), to deal in the Software without
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15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
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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>
37 #include <asm/setup.h>
38 #include <asm/pgalloc.h>
39 #include <xen/evtchn.h>
40 #include <asm/hypervisor.h>
41 #include <xen/interface/io/blkif.h>
42 #include <xen/interface/io/ring.h>
43 #include <xen/gnttab.h>
44 #include <xen/driver_util.h>
46 #define DPRINTK(_f, _a...) pr_debug("(file=%s, line=%d) " _f, \
47 __FILE__ , __LINE__ , ## _a )
49 #define WPRINTK(fmt, args...) printk(KERN_WARNING "blk_tap: " fmt, ##args)
53 typedef struct blkif_st {
54 /* Unique identifier for this interface. */
57 /* Physical parameters of the comms window. */
60 /* Comms information. */
61 blkif_back_ring_t blk_ring;
62 struct vm_struct *blk_ring_area;
63 /* Back pointer to the backend_info. */
64 struct backend_info *be;
66 spinlock_t blk_ring_lock;
70 struct task_struct *xenblkd;
71 unsigned int waiting_reqs;
72 request_queue_t *plug;
75 unsigned long st_print;
80 wait_queue_head_t waiting_to_free;
82 grant_handle_t shmem_handle;
83 grant_ref_t shmem_ref;
89 blkif_t *tap_alloc_blkif(domid_t domid);
90 void tap_blkif_free(blkif_t *blkif);
91 int tap_blkif_map(blkif_t *blkif, unsigned long shared_page,
93 void tap_blkif_unmap(blkif_t *blkif);
95 #define blkif_get(_b) (atomic_inc(&(_b)->refcnt))
96 #define blkif_put(_b) \
98 if (atomic_dec_and_test(&(_b)->refcnt)) \
99 wake_up(&(_b)->waiting_to_free);\
105 unsigned short nr_sects;
106 struct block_device *bdev;
107 blkif_sector_t sector_number;
110 void tap_blkif_interface_init(void);
112 void tap_blkif_xenbus_init(void);
114 irqreturn_t tap_blkif_be_int(int irq, void *dev_id, struct pt_regs *regs);
115 int tap_blkif_schedule(void *arg);
117 int dom_to_devid(domid_t domid, int xenbus_id, blkif_t *blkif);
118 void signal_tapdisk(int idx);
120 #endif /* __BLKIF__BACKEND__COMMON_H__ */