blkfront.c File Reference

#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <machine/vmparam.h>
#include <xen/xen-os.h>
#include <xen/hypervisor.h>
#include <xen/xen_intr.h>
#include <xen/gnttab.h>
#include <contrib/xen/grant_table.h>
#include <contrib/xen/io/protocols.h>
#include <xen/xenbus/xenbusvar.h>
#include <machine/_inttypes.h>
#include <geom/geom_disk.h>
#include <dev/xen/blkfront/block.h>
#include "xenbus_if.h"

Include dependency graph for blkfront.c:

Go to the source code of this file.

Macros
#define	DPRINTK(fmt, args...)
#define	XBD_SECTOR_SHFT   9

Functions
	__FBSDID ("$FreeBSD$")
static void	xbd_closing (device_t)
static void	xbd_startio (struct xbd_softc *sc)
static	MALLOC_DEFINE (M_XENBLOCKFRONT, "xbd", "Xen Block Front driver data")
	SYSCTL_NODE (_hw, OID_AUTO, xbd, CTLFLAG_RD|CTLFLAG_MPSAFE, 0, "xbd driver parameters")
	SYSCTL_INT (_hw_xbd, OID_AUTO, xbd_enable_indirect, CTLFLAG_RDTUN, &xbd_enable_indirect, 0, "Enable xbd indirect segments")
static void	xbd_freeze (struct xbd_softc *sc, xbd_flag_t xbd_flag)
static void	xbd_thaw (struct xbd_softc *sc, xbd_flag_t xbd_flag)
static void	xbd_cm_freeze (struct xbd_softc *sc, struct xbd_command *cm, xbdc_flag_t cm_flag)
static void	xbd_cm_thaw (struct xbd_softc *sc, struct xbd_command *cm)
static void	xbd_flush_requests (struct xbd_softc *sc)
static void	xbd_free_command (struct xbd_command *cm)
static void	xbd_mksegarray (bus_dma_segment_t *segs, int nsegs, grant_ref_t *gref_head, int otherend_id, int readonly, grant_ref_t *sg_ref, struct blkif_request_segment *sg)
static void	xbd_queue_cb (void *arg, bus_dma_segment_t *segs, int nsegs, int error)
static int	xbd_queue_request (struct xbd_softc *sc, struct xbd_command *cm)
static void	xbd_restart_queue_callback (void *arg)
static struct xbd_command *	xbd_bio_command (struct xbd_softc *sc)
static void	xbd_bio_complete (struct xbd_softc *sc, struct xbd_command *cm)
static void	xbd_int (void *xsc)
static void	xbd_quiesce (struct xbd_softc *sc)
static void	xbd_dump_complete (struct xbd_command *cm)
static int	xbd_dump (void *arg, void *virtual, vm_offset_t physical, off_t offset, size_t length)
static int	xbd_open (struct disk *dp)
static int	xbd_close (struct disk *dp)
static int	xbd_ioctl (struct disk *dp, u_long cmd, void *addr, int flag, struct thread *td)
static void	xbd_strategy (struct bio *bp)
static int	xbd_alloc_ring (struct xbd_softc *sc)
static void	xbd_free_ring (struct xbd_softc *sc)
static int	xbd_feature_string (struct xbd_softc *sc, char *features, size_t len)
static int	xbd_sysctl_features (SYSCTL_HANDLER_ARGS)
static void	xbd_setup_sysctl (struct xbd_softc *xbd)
static void	xbd_vdevice_to_unit (uint32_t vdevice, int *unit, const char **name)
int	xbd_instance_create (struct xbd_softc *sc, blkif_sector_t sectors, int vdevice, uint16_t vdisk_info, unsigned long sector_size, unsigned long phys_sector_size)
static void	xbd_free (struct xbd_softc *sc)
static void	xbd_initialize (struct xbd_softc *sc)
static void	xbd_connect (struct xbd_softc *sc)
static int	xbd_probe (device_t dev)
static int	xbd_attach (device_t dev)
static int	xbd_detach (device_t dev)
static int	xbd_suspend (device_t dev)
static int	xbd_resume (device_t dev)
static void	xbd_backend_changed (device_t dev, XenbusState backend_state)
	DRIVER_MODULE (xbd, xenbusb_front, xbd_driver, xbd_devclass, 0, 0)

Variables
static int	xbd_enable_indirect = 1
static device_method_t	xbd_methods []
static driver_t	xbd_driver
devclass_t	xbd_devclass

Macro Definition Documentation

DPRINTK

#define DPRINTK	(		fmt,
			args...
	)

Definition at line 76 of file blkfront.c.

XBD_SECTOR_SHFT

#define XBD_SECTOR_SHFT   9

Definition at line 79 of file blkfront.c.

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

DRIVER_MODULE()

DRIVER_MODULE	(	xbd	,
		xenbusb_front	,
		xbd_driver	,
		xbd_devclass	,
		0	,
		0
	)

MALLOC_DEFINE()

static MALLOC_DEFINE ( M_XENBLOCKFRONT  , "xbd"  , "Xen Block Front driver data"    )

static

SYSCTL_INT()

SYSCTL_INT	(	_hw_xbd	,
		OID_AUTO	,
		xbd_enable_indirect	,
		CTLFLAG_RDTUN	,
		&	xbd_enable_indirect,
		0	,
		"Enable xbd indirect segments"
	)

SYSCTL_NODE()

SYSCTL_NODE	(	_hw	,
		OID_AUTO	,
		xbd	,
		CTLFLAG_RD|	CTLFLAG_MPSAFE,
		0	,
		"xbd driver parameters"
	)

xbd_alloc_ring()

static int xbd_alloc_ring ( struct xbd_softc *  sc )

static

Definition at line 750 of file blkfront.c.

References xbd_softc::xbd_dev, xbd_int(), xbd_softc::xbd_ring, xbd_softc::xbd_ring_pages, xbd_softc::xbd_ring_ref, xbd_softc::xen_intr_handle, and xs_printf().

Referenced by xbd_initialize().

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xbd_attach()

static int xbd_attach ( device_t  dev )

static

Definition at line 1485 of file blkfront.c.

References xbd_softc::xbd_dev, xbd_initqs(), xbd_softc::xbd_io_lock, XBD_MAX_RING_PAGES, xbd_softc::xbd_ring_ref, xbd_setup_sysctl(), xbd_softc::xbd_state, XBD_STATE_DISCONNECTED, xbd_softc::xbd_vdevice, xbd_vdevice_to_unit(), and xs_scanf().

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xbd_backend_changed()

static void xbd_backend_changed ( device_t  dev, XenbusState  backend_state  )

static

Callback received when the backend's state changes.

Definition at line 1591 of file blkfront.c.

References DPRINTK, xbd_closing(), xbd_connect(), xbd_softc::xbd_disk, xbd_initialize(), and xbd_softc::xbd_users.

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xbd_bio_command()

static struct xbd_command * xbd_bio_command ( struct xbd_softc *  sc )

static

Definition at line 335 of file blkfront.c.

References xbd_command::cm_bp, xbd_command::cm_flags, xbd_command::cm_gref_head, xbd_command::cm_operation, xbd_command::cm_sector_number, gnttab_alloc_grant_references(), gnttab_request_free_callback(), xbd_softc::xbd_callback, xbd_dequeue_bio(), xbd_dequeue_cm(), xbd_enqueue_cm(), xbd_softc::xbd_flags, xbd_freeze(), xbd_softc::xbd_max_request_segments, XBD_Q_BUSY, XBD_Q_FREE, XBD_Q_READY, xbd_queue_length(), xbd_requeue_bio(), xbd_requeue_cm(), xbd_restart_queue_callback(), xbd_softc::xbd_state, XBD_STATE_CONNECTED, XBDCF_Q_FREEZE, XBDF_BARRIER, XBDF_CM_SHORTAGE, XBDF_FLUSH, XBDF_GNT_SHORTAGE, and XBDF_WAIT_IDLE.

Referenced by xbd_startio().

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xbd_bio_complete()

static void xbd_bio_complete ( struct xbd_softc *  sc, struct xbd_command *  cm  )

static

Definition at line 460 of file blkfront.c.

References xbd_command::cm_bp, xbd_command::cm_status, and xbd_free_command().

Referenced by xbd_int().

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xbd_close()

static int xbd_close ( struct disk *  dp )

static

Definition at line 687 of file blkfront.c.

References xbd_closing(), xbd_softc::xbd_dev, xbd_softc::xbd_flags, and xbd_softc::xbd_users.

Referenced by xbd_instance_create().

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xbd_closing()

static void xbd_closing ( device_t  dev )

static

Handle the change of state of the backend to Closing. We must delete our device-layer structures now, to ensure that writes are flushed through to the backend. Once this is done, we can switch to Closed in acknowledgement.

Definition at line 1418 of file blkfront.c.

References DPRINTK, and xbd_softc::xbd_disk.

Referenced by xbd_backend_changed(), and xbd_close().

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xbd_cm_freeze()

static void xbd_cm_freeze ( struct xbd_softc *  sc, struct xbd_command *  cm, xbdc_flag_t  cm_flag  )

static

Definition at line 116 of file blkfront.c.

References xbd_command::cm_flags, xbd_freeze(), XBDCF_FROZEN, and XBDF_NONE.

Referenced by xbd_queue_request(), and xbd_startio().

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xbd_cm_thaw()

static void xbd_cm_thaw ( struct xbd_softc *  sc, struct xbd_command *  cm  )

static

Definition at line 126 of file blkfront.c.

References xbd_command::cm_flags, xbd_thaw(), XBDCF_FROZEN, and XBDF_NONE.

Referenced by xbd_int().

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xbd_connect()

static void xbd_connect ( struct xbd_softc *  sc )

static

Definition at line 1221 of file blkfront.c.

References xbd_command::cm_flags, xbd_command::cm_id, xbd_command::cm_indirectionpages, xbd_command::cm_indirectionrefs, xbd_command::cm_map, xbd_command::cm_sc, xbd_command::cm_sg_refs, DPRINTK, gnttab_grant_foreign_access(), xbd_softc::xbd_dev, xbd_softc::xbd_disk, xbd_enable_indirect, xbd_softc::xbd_flags, xbd_free_command(), XBD_INDIRECT_SEGS_TO_PAGES, xbd_instance_create(), xbd_softc::xbd_io_dmat, xbd_softc::xbd_io_lock, XBD_MAX_INDIRECT_SEGMENTS, xbd_softc::xbd_max_request_indirectpages, xbd_softc::xbd_max_request_segments, xbd_softc::xbd_max_request_size, xbd_softc::xbd_max_requests, XBD_SEGS_TO_SIZE, xbd_softc::xbd_shadow, XBD_SIZE_TO_SEGS, xbd_startio(), xbd_softc::xbd_state, XBD_STATE_CONNECTED, XBD_STATE_SUSPENDED, xbd_softc::xbd_vdevice, XBDCF_INITIALIZER, XBDF_BARRIER, XBDF_FLUSH, XBDF_READY, and xs_gather().

Referenced by xbd_backend_changed().

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xbd_detach()

static int xbd_detach ( device_t  dev )

static

Definition at line 1529 of file blkfront.c.

References DPRINTK, xbd_free(), and xbd_softc::xbd_io_lock.

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xbd_dump()

static int xbd_dump ( void *  arg, void *  virtual, vm_offset_t  physical, off_t  offset, size_t  length  )

static

Definition at line 596 of file blkfront.c.

References xbd_command::cm_complete, xbd_command::cm_data, xbd_command::cm_datalen, xbd_command::cm_gref_head, xbd_command::cm_operation, xbd_command::cm_sector_number, xbd_command::cm_status, gnttab_alloc_grant_references(), xbd_dequeue_cm(), xbd_softc::xbd_dev, xbd_dump_complete(), xbd_enqueue_cm(), xbd_free_command(), xbd_softc::xbd_io_lock, xbd_softc::xbd_max_request_segments, xbd_softc::xbd_max_request_size, XBD_Q_COMPLETE, XBD_Q_FREE, XBD_Q_READY, xbd_quiesce(), and xbd_startio().

Referenced by xbd_instance_create().

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xbd_dump_complete()

static void xbd_dump_complete ( struct xbd_command *  cm )

static

Definition at line 589 of file blkfront.c.

References xbd_enqueue_cm(), and XBD_Q_COMPLETE.

Referenced by xbd_dump().

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xbd_feature_string()

static int xbd_feature_string ( struct xbd_softc *  sc, char *  features, size_t  len  )

static

Definition at line 837 of file blkfront.c.

References xbd_softc::xbd_flags, XBDF_BARRIER, XBDF_DISCARD, XBDF_FLUSH, and XBDF_PERSISTENT.

Referenced by xbd_instance_create(), and xbd_sysctl_features().

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xbd_flush_requests()

static void xbd_flush_requests ( struct xbd_softc *  sc )

inlinestatic

Definition at line 136 of file blkfront.c.

References notify(), xbd_softc::xbd_ring, and xbd_softc::xen_intr_handle.

Referenced by xbd_queue_cb(), and xbd_startio().

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xbd_free()

static void xbd_free ( struct xbd_softc *  sc )

static

Definition at line 1047 of file blkfront.c.

References xbd_command::cm_indirectionpages, xbd_command::cm_indirectionrefs, xbd_command::cm_map, xbd_command::cm_sg_refs, gnttab_end_foreign_access_references(), xbd_free_ring(), xbd_initq_cm(), xbd_softc::xbd_io_dmat, xbd_softc::xbd_io_lock, xbd_softc::xbd_max_request_indirectpages, xbd_softc::xbd_max_requests, XBD_Q_COMPLETE, XBD_Q_FREE, XBD_Q_READY, xbd_softc::xbd_shadow, xbd_softc::xbd_state, XBD_STATE_DISCONNECTED, and xbd_softc::xen_intr_handle.

Referenced by xbd_detach(), and xbd_resume().

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xbd_free_command()

static void xbd_free_command ( struct xbd_command *  cm )

static

Definition at line 147 of file blkfront.c.

References xbd_command::cm_bp, xbd_command::cm_complete, xbd_command::cm_flags, xbd_command::cm_sc, xbd_enqueue_cm(), XBD_Q_FREE, XBD_Q_NONE, xbd_thaw(), XBDCF_INITIALIZER, XBDCF_Q_MASK, and XBDF_CM_SHORTAGE.

Referenced by xbd_bio_complete(), xbd_connect(), xbd_dump(), xbd_int(), and xbd_queue_cb().

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xbd_free_ring()

static void xbd_free_ring ( struct xbd_softc *  sc )

static

Definition at line 818 of file blkfront.c.

References gnttab_end_foreign_access_ref(), xbd_softc::xbd_ring, xbd_softc::xbd_ring_pages, and xbd_softc::xbd_ring_ref.

Referenced by xbd_free().

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xbd_freeze()

static void xbd_freeze ( struct xbd_softc *  sc, xbd_flag_t  xbd_flag  )

static

Definition at line 92 of file blkfront.c.

References xbd_softc::xbd_flags, xbd_softc::xbd_qfrozen_cnt, and XBDF_NONE.

Referenced by xbd_bio_command(), and xbd_cm_freeze().

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xbd_initialize()

static void xbd_initialize ( struct xbd_softc *  sc )

static

Definition at line 1096 of file blkfront.c.

References xbd_alloc_ring(), xbd_softc::xbd_dev, XBD_MAX_REQUESTS, xbd_softc::xbd_max_requests, XBD_MAX_RING_PAGES, xbd_softc::xbd_ring_pages, xbd_softc::xen_intr_handle, xs_printf(), and xs_scanf().

Referenced by xbd_backend_changed(), and xbd_resume().

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xbd_instance_create()

int xbd_instance_create	(	struct xbd_softc *	sc,
		blkif_sector_t	sectors,
		int	vdevice,
		uint16_t	vdisk_info,
		unsigned long	sector_size,
		unsigned long	phys_sector_size
	)

Definition at line 1000 of file blkfront.c.

References xbd_close(), xbd_softc::xbd_dev, xbd_softc::xbd_disk, xbd_dump(), xbd_feature_string(), xbd_softc::xbd_flags, xbd_ioctl(), xbd_softc::xbd_max_request_size, xbd_open(), xbd_strategy(), xbd_softc::xbd_unit, xbd_vdevice_to_unit(), XBDF_BARRIER, and XBDF_FLUSH.

Referenced by xbd_connect().

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xbd_int()

static void xbd_int ( void *  xsc )

static

Definition at line 482 of file blkfront.c.

References xbd_command::cm_bp, xbd_command::cm_complete, xbd_command::cm_map, xbd_command::cm_nseg, xbd_command::cm_operation, xbd_command::cm_sg_refs, xbd_command::cm_status, gnttab_end_foreign_access_references(), xbd_bio_complete(), xbd_softc::xbd_cm_q, xbd_cm_thaw(), xbd_free_command(), xbd_softc::xbd_io_dmat, xbd_softc::xbd_io_lock, XBD_Q_BUSY, xbd_queue_length(), xbd_remove_cm(), xbd_softc::xbd_ring, xbd_softc::xbd_shadow, xbd_startio(), xbd_softc::xbd_state, XBD_STATE_DISCONNECTED, XBD_STATE_SUSPENDED, xbd_thaw(), and XBDF_WAIT_IDLE.

Referenced by xbd_alloc_ring(), and xbd_quiesce().

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xbd_ioctl()

static int xbd_ioctl ( struct disk *  dp, u_long  cmd, void *  addr, int  flag, struct thread *  td  )

static

Definition at line 708 of file blkfront.c.

Referenced by xbd_instance_create().

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xbd_mksegarray()

static void xbd_mksegarray ( bus_dma_segment_t *  segs, int  nsegs, grant_ref_t *  gref_head, int  otherend_id, int  readonly, grant_ref_t *  sg_ref, struct blkif_request_segment *  sg  )

static

Definition at line 162 of file blkfront.c.

References gnttab_claim_grant_reference(), gnttab_grant_foreign_access_ref(), and XBD_SECTOR_SHFT.

Referenced by xbd_queue_cb().

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xbd_open()

static int xbd_open ( struct disk *  dp )

static

Definition at line 672 of file blkfront.c.

References xbd_softc::xbd_flags, xbd_softc::xbd_users, and XBDF_OPEN.

Referenced by xbd_instance_create().

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xbd_probe()

static int xbd_probe ( device_t  dev )

static

Definition at line 1436 of file blkfront.c.

References xs_read().

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xbd_queue_cb()

static void xbd_queue_cb ( void *  arg, bus_dma_segment_t *  segs, int  nsegs, int  error  )

static

Definition at line 212 of file blkfront.c.

References xbd_command::cm_bp, xbd_command::cm_flags, xbd_command::cm_gref_head, xbd_command::cm_id, xbd_command::cm_indirectionpages, xbd_command::cm_indirectionrefs, xbd_command::cm_map, xbd_command::cm_nseg, xbd_command::cm_operation, xbd_command::cm_sc, xbd_command::cm_sector_number, xbd_command::cm_sg_refs, gnttab_free_grant_references(), xbd_softc::xbd_dev, xbd_softc::xbd_disk, xbd_enqueue_cm(), xbd_flush_requests(), xbd_free_command(), xbd_softc::xbd_io_dmat, xbd_softc::xbd_max_request_indirectpages, xbd_mksegarray(), XBD_Q_BUSY, xbd_softc::xbd_ring, and XBDCF_ASYNC_MAPPING.

Referenced by xbd_queue_request().

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xbd_queue_request()

static int xbd_queue_request ( struct xbd_softc *  sc, struct xbd_command *  cm  )

static

Definition at line 296 of file blkfront.c.

References xbd_command::cm_bp, xbd_command::cm_data, xbd_command::cm_datalen, xbd_command::cm_map, xbd_cm_freeze(), xbd_softc::xbd_io_dmat, xbd_queue_cb(), and XBDCF_ASYNC_MAPPING.

Referenced by xbd_startio().

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xbd_quiesce()

static void xbd_quiesce ( struct xbd_softc *  sc )

static

Quiesce the disk writes for a dump file before allowing the next buffer.

Definition at line 566 of file blkfront.c.

References xbd_int(), XBD_Q_BUSY, xbd_queue_length(), and xbd_softc::xbd_ring.

Referenced by xbd_dump().

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xbd_restart_queue_callback()

static void xbd_restart_queue_callback ( void *  arg )

static

Definition at line 321 of file blkfront.c.

References xbd_softc::xbd_io_lock, xbd_startio(), xbd_thaw(), and XBDF_GNT_SHORTAGE.

Referenced by xbd_bio_command().

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xbd_resume()

static int xbd_resume ( device_t  dev )

static

Definition at line 1571 of file blkfront.c.

References DPRINTK, xbd_free(), xbd_initialize(), xbd_softc::xbd_state, XBD_STATE_CONNECTED, and xen_suspend_cancelled.

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xbd_setup_sysctl()

static void xbd_setup_sysctl ( struct xbd_softc *  xbd )

static

Definition at line 894 of file blkfront.c.

References xbd_softc::xbd_dev, xbd_softc::xbd_max_request_segments, xbd_softc::xbd_max_request_size, xbd_softc::xbd_max_requests, xbd_softc::xbd_ring_pages, and xbd_sysctl_features().

Referenced by xbd_attach().

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xbd_startio()

static void xbd_startio ( struct xbd_softc *  sc )

static

Definition at line 418 of file blkfront.c.

References xbd_command::cm_flags, xbd_bio_command(), xbd_cm_freeze(), xbd_dequeue_cm(), xbd_flush_requests(), xbd_softc::xbd_io_lock, XBD_Q_READY, xbd_softc::xbd_qfrozen_cnt, xbd_queue_request(), xbd_softc::xbd_ring, xbd_softc::xbd_state, XBD_STATE_CONNECTED, and XBDCF_Q_FREEZE.

Referenced by xbd_connect(), xbd_dump(), xbd_int(), xbd_restart_queue_callback(), and xbd_strategy().

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xbd_strategy()

static void xbd_strategy ( struct bio *  bp )

static

Definition at line 723 of file blkfront.c.

References xbd_enqueue_bio(), xbd_softc::xbd_io_lock, and xbd_startio().

Referenced by xbd_instance_create().

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xbd_suspend()

static int xbd_suspend ( device_t  dev )

static

Definition at line 1542 of file blkfront.c.

References xbd_softc::xbd_cm_q, xbd_softc::xbd_io_lock, XBD_Q_BUSY, xbd_queue_length(), xbd_softc::xbd_state, and XBD_STATE_SUSPENDED.

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xbd_sysctl_features()

static int xbd_sysctl_features ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 876 of file blkfront.c.

References xbd_feature_string().

Referenced by xbd_setup_sysctl().

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xbd_thaw()

static void xbd_thaw ( struct xbd_softc *  sc, xbd_flag_t  xbd_flag  )

static

Definition at line 102 of file blkfront.c.

References xbd_softc::xbd_flags, xbd_softc::xbd_qfrozen_cnt, and XBDF_NONE.

Referenced by xbd_cm_thaw(), xbd_free_command(), xbd_int(), and xbd_restart_queue_callback().

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xbd_vdevice_to_unit()

static void xbd_vdevice_to_unit ( uint32_t  vdevice, int *  unit, const char **  name  )

static

Definition at line 937 of file blkfront.c.

Referenced by xbd_attach(), and xbd_instance_create().

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Variable Documentation

xbd_devclass

devclass_t xbd_devclass

Definition at line 1649 of file blkfront.c.

xbd_driver

driver_t xbd_driver

static

Initial value:

= { 
        "xbd", 
        xbd_methods, 
        sizeof(struct xbd_softc),                      
}

Definition at line 1644 of file blkfront.c.

xbd_enable_indirect

int xbd_enable_indirect = 1

static

Definition at line 84 of file blkfront.c.

Referenced by xbd_connect().

xbd_methods

device_method_t xbd_methods[]

static

Initial value:

= { 
         
        DEVMETHOD(device_probe,         xbd_probe), 
        DEVMETHOD(device_attach,        xbd_attach), 
        DEVMETHOD(device_detach,        xbd_detach), 
        DEVMETHOD(device_shutdown,      bus_generic_shutdown), 
        DEVMETHOD(device_suspend,       xbd_suspend), 
        DEVMETHOD(device_resume,        xbd_resume), 
 
        
        DEVMETHOD(xenbus_otherend_changed, xbd_backend_changed),
 
        { 0, 0 } 
}

Definition at line 1629 of file blkfront.c.