xenstore_dev.c File Reference

#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/uio.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/module.h>
#include <sys/selinfo.h>
#include <sys/sysctl.h>
#include <sys/poll.h>
#include <xen/xen-os.h>
#include <xen/hypervisor.h>
#include <xen/xenstore/xenstorevar.h>
#include <xen/xenstore/xenstore_internal.h>

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Data Structures
struct	xs_dev_transaction
struct	xs_dev_watch
struct	xs_dev_data

Macros
#define	MASK_READ_IDX(idx)   ((idx)&(PAGE_SIZE-1))

Functions
	__FBSDID ("$FreeBSD$")
static void	xs_queue_reply (struct xs_dev_data *u, const char *data, unsigned int len)
static const char *	xs_dev_error_to_string (int error)
static void	xs_dev_return_error (struct xs_dev_data *u, int error, int req_id, int tx_id)
static int	xs_dev_watch_message_parse_string (const char **p, const char *end, const char **string_r)
static int	xs_dev_watch_message_parse (const struct xsd_sockmsg *msg, const char **path_r, const char **token_r)
static struct xs_dev_watch *	xs_dev_find_watch (struct xs_dev_data *u, const char *token)
static void	xs_dev_watch_cb (struct xs_watch *watch, const char **vec, unsigned int len)
static struct xs_dev_transaction *	xs_dev_find_transaction (struct xs_dev_data *u, uint32_t tx_id)
static int	xs_dev_read (struct cdev *dev, struct uio *uio, int ioflag)
static int	xs_dev_write (struct cdev *dev, struct uio *uio, int ioflag)
static int	xs_dev_poll (struct cdev *dev, int events, struct thread *td)
static void	xs_dev_dtor (void *arg)
static int	xs_dev_open (struct cdev *dev, int oflags, int devtype, struct thread *td)
static void	xs_dev_identify (driver_t *driver __unused, device_t parent)
	Identify instances of this device type in the system. More...
static int	xs_dev_probe (device_t dev)
	Probe for the existence of the Xenstore device. More...
static int	xs_dev_attach (device_t dev)
	Attach the Xenstore device. More...
	DEFINE_CLASS_0 (xs_dev, xs_dev_driver, xs_dev_methods, 0)
	DRIVER_MODULE (xs_dev, xenstore, xs_dev_driver, xs_dev_devclass, NULL, NULL)

Variables
static unsigned int	max_pending_watches = 1000
static struct cdevsw	xs_dev_cdevsw
static device_method_t	xs_dev_methods []
devclass_t	xs_dev_devclass

Macro Definition Documentation

MASK_READ_IDX

#define MASK_READ_IDX

(

idx

)

((idx)&(PAGE_SIZE-1))

Definition at line 85 of file xenstore_dev.c.

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

DEFINE_CLASS_0()

DEFINE_CLASS_0	(	xs_dev	,
		xs_dev_driver	,
		xs_dev_methods	,
		0
	)

DRIVER_MODULE()

DRIVER_MODULE	(	xs_dev	,
		xenstore	,
		xs_dev_driver	,
		xs_dev_devclass	,
		NULL	,
		NULL
	)

xs_dev_attach()

static int xs_dev_attach ( device_t  dev )

static

Attach the Xenstore device.

Parameters

dev	NewBus device_t for this instance.

Returns

On success, 0. Otherwise an errno value indicating the type of failure.

Definition at line 513 of file xenstore_dev.c.

References max_pending_watches, and xs_dev_cdevsw.

xs_dev_dtor()

static void xs_dev_dtor ( void *  arg )

static

Definition at line 420 of file xenstore_dev.c.

References xs_dev_data::ev_rsel, xs_dev_data::lock, xs_dev_data::u, xs_transaction_end(), and xs_unregister_watch().

Referenced by xs_dev_open().

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xs_dev_error_to_string()

static const char * xs_dev_error_to_string ( int  error )

static

Definition at line 112 of file xenstore_dev.c.

Referenced by xs_dev_return_error().

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xs_dev_find_transaction()

static struct xs_dev_transaction * xs_dev_find_transaction ( struct xs_dev_data *  u, uint32_t  tx_id  )

static

Definition at line 219 of file xenstore_dev.c.

Referenced by xs_dev_write().

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xs_dev_find_watch()

static struct xs_dev_watch * xs_dev_find_watch ( struct xs_dev_data *  u, const char *  token  )

static

Definition at line 185 of file xenstore_dev.c.

Referenced by xs_dev_write().

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xs_dev_identify()

static void xs_dev_identify ( driver_t *driver  __unused, device_t  parent  )

static

Identify instances of this device type in the system.

Parameters

driver	The driver performing this identify action.
parent	The NewBus parent device for any devices this method adds.

Definition at line 480 of file xenstore_dev.c.

xs_dev_open()

static int xs_dev_open ( struct cdev *  dev, int  oflags, int  devtype, struct thread *  td  )

static

Definition at line 447 of file xenstore_dev.c.

References xs_dev_data::u, and xs_dev_dtor().

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xs_dev_poll()

static int xs_dev_poll ( struct cdev *  dev, int  events, struct thread *  td  )

static

Definition at line 395 of file xenstore_dev.c.

References xs_dev_data::u.

xs_dev_probe()

static int xs_dev_probe ( device_t  dev )

static

Probe for the existence of the Xenstore device.

Parameters

dev	NewBus device_t for this instance.

Returns

Always returns 0 indicating success.

Definition at line 497 of file xenstore_dev.c.

xs_dev_read()

static int xs_dev_read ( struct cdev *  dev, struct uio *  uio, int  ioflag  )

static

Definition at line 231 of file xenstore_dev.c.

References MASK_READ_IDX, and xs_dev_data::u.

xs_dev_return_error()

static void xs_dev_return_error ( struct xs_dev_data *  u, int  error, int  req_id, int  tx_id  )

static

Definition at line 124 of file xenstore_dev.c.

References xs_dev_data::lock, xs_dev_error_to_string(), and xs_queue_reply().

Referenced by xs_dev_write().

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xs_dev_watch_cb()

static void xs_dev_watch_cb ( struct xs_watch *  watch, const char **  vec, unsigned int  len  )

static

Definition at line 197 of file xenstore_dev.c.

References xs_queue_reply().

Referenced by xs_dev_write().

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xs_dev_watch_message_parse()

static int xs_dev_watch_message_parse ( const struct xsd_sockmsg *  msg, const char **  path_r, const char **  token_r  )

static

Definition at line 164 of file xenstore_dev.c.

References xs_dev_watch_message_parse_string().

Referenced by xs_dev_write().

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xs_dev_watch_message_parse_string()

static int xs_dev_watch_message_parse_string ( const char **  p, const char *  end, const char **  string_r  )

static

Definition at line 148 of file xenstore_dev.c.

Referenced by xs_dev_watch_message_parse().

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xs_dev_write()

static int xs_dev_write ( struct cdev *  dev, struct uio *  uio, int  ioflag  )

static

Definition at line 259 of file xenstore_dev.c.

References xs_dev_data::lock, max_pending_watches, xs_dev_data::u, xs_dev_find_transaction(), xs_dev_find_watch(), xs_dev_request_and_reply(), xs_dev_return_error(), xs_dev_watch_cb(), xs_dev_watch_message_parse(), xs_queue_reply(), xs_register_watch(), and xs_unregister_watch().

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xs_queue_reply()

static void xs_queue_reply ( struct xs_dev_data *  u, const char *  data, unsigned int  len  )

static

Definition at line 97 of file xenstore_dev.c.

References xs_dev_data::ev_rsel, MASK_READ_IDX, xs_dev_data::read_buffer, xs_dev_data::read_cons, and xs_dev_data::read_prod.

Referenced by xs_dev_return_error(), xs_dev_watch_cb(), and xs_dev_write().

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Variable Documentation

max_pending_watches

unsigned int max_pending_watches = 1000

static

Definition at line 56 of file xenstore_dev.c.

Referenced by xs_dev_attach(), and xs_dev_write().

xs_dev_cdevsw

struct cdevsw xs_dev_cdevsw

static

Initial value:

= {
        .d_version = D_VERSION, 
        .d_read = xs_dev_read,
        .d_write = xs_dev_write,
        .d_open = xs_dev_open,
        .d_poll = xs_dev_poll,
        .d_name = "xs_dev",
}

Definition at line 463 of file xenstore_dev.c.

Referenced by xs_dev_attach().

xs_dev_devclass

devclass_t xs_dev_devclass

Definition at line 547 of file xenstore_dev.c.

xs_dev_methods

device_method_t xs_dev_methods[]

static

Initial value:

= {
        
        DEVMETHOD(device_identify,      xs_dev_identify),
        DEVMETHOD(device_probe,         xs_dev_probe),
        DEVMETHOD(device_attach,        xs_dev_attach),
 
        DEVMETHOD_END
}

Definition at line 537 of file xenstore_dev.c.