diff options
Diffstat (limited to 'linux-2.4.26-xen-sparse/arch/xen/drivers/blkif/backend/common.h')
| -rw-r--r-- | linux-2.4.26-xen-sparse/arch/xen/drivers/blkif/backend/common.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/linux-2.4.26-xen-sparse/arch/xen/drivers/blkif/backend/common.h b/linux-2.4.26-xen-sparse/arch/xen/drivers/blkif/backend/common.h new file mode 100644 index 0000000000..d9f1d22908 --- /dev/null +++ b/linux-2.4.26-xen-sparse/arch/xen/drivers/blkif/backend/common.h @@ -0,0 +1,108 @@ +/****************************************************************************** + * arch/xen/drivers/blkif/backend/common.h + */ + +#ifndef __BLKIF__BACKEND__COMMON_H__ +#define __BLKIF__BACKEND__COMMON_H__ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/rbtree.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <linux/blkdev.h> +#include <asm/ctrl_if.h> +#include <asm/io.h> +#include "../blkif.h" + +#ifndef NDEBUG +#define ASSERT(_p) \ + if ( !(_p) ) { printk("Assertion '%s' failed, line %d, file %s", #_p , \ + __LINE__, __FILE__); *(int*)0=0; } +#define DPRINTK(_f, _a...) printk("(file=%s, line=%d) " _f, \ + __FILE__ , __LINE__ , ## _a ) +#else +#define ASSERT(_p) ((void)0) +#define DPRINTK(_f, _a...) ((void)0) +#endif + +typedef struct blkif_st { + /* Unique identifier for this interface. */ + domid_t domid; + unsigned int handle; + /* Physical parameters of the comms window. */ + unsigned long shmem_frame; + unsigned int evtchn; + int irq; + /* Comms information. */ + blkif_ring_t *blk_ring_base; /* ioremap()'ed ptr to shmem_frame. */ + BLK_RING_IDX blk_req_cons; /* Request consumer. */ + BLK_RING_IDX blk_resp_prod; /* Private version of response producer. */ + /* VBDs attached to this interface. */ + rb_root_t vbd_rb; /* Mapping from 16-bit vdevices to VBDs. */ + spinlock_t vbd_lock; /* Protects VBD mapping. */ + /* Private fields. */ + enum { DISCONNECTED, DISCONNECTING, CONNECTED } status; + /* + * DISCONNECT response is deferred until pending requests are ack'ed. + * We therefore need to store the id from the original request. + */ + u8 disconnect_rspid; + struct blkif_st *hash_next; + struct list_head blkdev_list; + spinlock_t blk_ring_lock; + atomic_t refcnt; +} blkif_t; + +void blkif_create(blkif_be_create_t *create); +void blkif_destroy(blkif_be_destroy_t *destroy); +void blkif_connect(blkif_be_connect_t *connect); +int blkif_disconnect(blkif_be_disconnect_t *disconnect, u8 rsp_id); +void __blkif_disconnect_complete(blkif_t *blkif); +blkif_t *blkif_find_by_handle(domid_t domid, unsigned int handle); +#define blkif_get(_b) (atomic_inc(&(_b)->refcnt)) +#define blkif_put(_b) \ + do { \ + if ( atomic_dec_and_test(&(_b)->refcnt) ) \ + __blkif_disconnect_complete(_b); \ + } while (0) + +/* An entry in a list of xen_extents. */ +typedef struct _blkif_extent_le { + blkif_extent_t extent; /* an individual extent */ + struct _blkif_extent_le *next; /* and a pointer to the next */ +} blkif_extent_le_t; + +typedef struct _vbd { + blkif_vdev_t vdevice; /* what the domain refers to this vbd as */ + unsigned char readonly; /* Non-zero -> read-only */ + unsigned char type; /* XD_TYPE_xxx */ + blkif_extent_le_t *extents; /* list of xen_extents making up this vbd */ + rb_node_t rb; /* for linking into R-B tree lookup struct */ +} vbd_t; + +void vbd_create(blkif_be_vbd_create_t *create); +void vbd_grow(blkif_be_vbd_grow_t *grow); +void vbd_shrink(blkif_be_vbd_shrink_t *shrink); +void vbd_destroy(blkif_be_vbd_destroy_t *delete); +int vbd_probe(blkif_t *blkif, vdisk_t *vbd_info, int max_vbds); +void destroy_all_vbds(blkif_t *blkif); + +/* Describes a [partial] disk extent (part of a block io request) */ +typedef struct { + unsigned short dev; + unsigned short nr_sects; + unsigned long buffer; + xen_sector_t sector_number; +} phys_seg_t; + +int vbd_translate(phys_seg_t *pseg, blkif_t *blkif, int operation); + +void blkif_interface_init(void); +void blkif_ctrlif_init(void); + +void blkif_deschedule(blkif_t *blkif); + +void blkif_be_int(int irq, void *dev_id, struct pt_regs *regs); + +#endif /* __BLKIF__BACKEND__COMMON_H__ */ |