C++ xpt_create_path函数代码示例

/*
 * mrsas_bus_scan:	Perform bus scan
 * input:			Adapter instance soft state
 *
 * This mrsas_bus_scan function is needed for FreeBSD 7.x.  Also, it should not
 * be called in FreeBSD 8.x and later versions, where the bus scan is
 * automatic.
 */
int
mrsas_bus_scan(struct mrsas_softc *sc)
{
    union ccb *ccb_0;
    union ccb *ccb_1;

    if ((ccb_0 = xpt_alloc_ccb()) == NULL) {
        return (ENOMEM);
    }
    if ((ccb_1 = xpt_alloc_ccb()) == NULL) {
        xpt_free_ccb(ccb_0);
        return (ENOMEM);
    }
    mtx_lock(&sc->sim_lock);
    if (xpt_create_path(&ccb_0->ccb_h.path, xpt_periph, cam_sim_path(sc->sim_0),
                        CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
        xpt_free_ccb(ccb_0);
        xpt_free_ccb(ccb_1);
        mtx_unlock(&sc->sim_lock);
        return (EIO);
    }
    if (xpt_create_path(&ccb_1->ccb_h.path, xpt_periph, cam_sim_path(sc->sim_1),
                        CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
        xpt_free_ccb(ccb_0);
        xpt_free_ccb(ccb_1);
        mtx_unlock(&sc->sim_lock);
        return (EIO);
    }
    mtx_unlock(&sc->sim_lock);
    xpt_rescan(ccb_0);
    xpt_rescan(ccb_1);

    return (0);
}

/*
 * mrsas_bus_scan:           Perform bus scan 
 * input:                    Adapter instance soft state  
 *
 * This mrsas_bus_scan function is needed for FreeBSD 7.x.  Also, it should
 * not be called in FreeBSD 8.x and later versions, where the bus scan is 
 * automatic. 
 */ 
int mrsas_bus_scan(struct mrsas_softc *sc)
{
    union ccb *ccb_0;
    union ccb *ccb_1;

    lockmgr(&sc->sim_lock, LK_EXCLUSIVE);
    if ((ccb_0 = xpt_alloc_ccb()) == NULL) {
        lockmgr(&sc->sim_lock, LK_RELEASE);
        return(ENOMEM);
    }

    if ((ccb_1 = xpt_alloc_ccb()) == NULL) {
	xpt_free_ccb(ccb_0);
        lockmgr(&sc->sim_lock, LK_RELEASE);
        return(ENOMEM);
    } 

    if (xpt_create_path(&ccb_0->ccb_h.path, xpt_periph, cam_sim_path(sc->sim_0),
            CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP){
        xpt_free_ccb(ccb_0);
        xpt_free_ccb(ccb_1);
        lockmgr(&sc->sim_lock, LK_RELEASE);
        return(EIO);
    }

    if (xpt_create_path(&ccb_1->ccb_h.path, xpt_periph, cam_sim_path(sc->sim_1),
            CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP){
        xpt_free_ccb(ccb_0);
        xpt_free_ccb(ccb_1);
        lockmgr(&sc->sim_lock, LK_RELEASE);
        return(EIO);
    }

    xpt_setup_ccb(&ccb_0->ccb_h, ccb_0->ccb_h.path, 5/*priority (low)*/);
    ccb_0->ccb_h.func_code = XPT_SCAN_BUS;
    ccb_0->ccb_h.cbfcnp = mrsas_rescan_callback;
    ccb_0->crcn.flags = CAM_FLAG_NONE;
    xpt_action(ccb_0); /* scan is now in progress */

    xpt_setup_ccb(&ccb_1->ccb_h, ccb_1->ccb_h.path, 5/*priority (low)*/);
    ccb_1->ccb_h.func_code = XPT_SCAN_BUS;
    ccb_1->ccb_h.cbfcnp = mrsas_rescan_callback;
    ccb_1->crcn.flags = CAM_FLAG_NONE;
    xpt_action(ccb_1); /* scan is now in progress */

    lockmgr(&sc->sim_lock, LK_RELEASE);

    return(0);
}

static void
cfcs_onoffline(void *arg, int online)
{
	struct cfcs_softc *softc;
	union ccb *ccb;

	softc = (struct cfcs_softc *)arg;

	mtx_lock(&softc->lock);
	softc->online = online;

	ccb = xpt_alloc_ccb_nowait();
	if (ccb == NULL) {
		printf("%s: unable to allocate CCB for rescan\n", __func__);
		goto bailout;
	}

	if (xpt_create_path(&ccb->ccb_h.path, xpt_periph,
			    cam_sim_path(softc->sim), CAM_TARGET_WILDCARD,
			    CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
		printf("%s: can't allocate path for rescan\n", __func__);
		xpt_free_ccb(ccb);
		goto bailout;
	}
	xpt_rescan(ccb);

bailout:
	mtx_unlock(&softc->lock);
}

static void
ptinit(void)
{
	cam_status status;
	struct cam_path *path;

	/*
	 * Install a global async callback.  This callback will
	 * receive async callbacks like "new device found".
	 */
	status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
				 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);

	if (status == CAM_REQ_CMP) {
		struct ccb_setasync csa;

                xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5);
                csa.ccb_h.func_code = XPT_SASYNC_CB;
                csa.event_enable = AC_FOUND_DEVICE;
                csa.callback = ptasync;
                csa.callback_arg = NULL;
                xpt_action((union ccb *)&csa);
		status = csa.ccb_h.status;
                xpt_free_path(path);
        }

	if (status != CAM_REQ_CMP) {
		printf("pt: Failed to attach master async callback "
		       "due to status 0x%x!\n", status);
	}
}

static void *
nvme_sim_new_ns(struct nvme_namespace *ns, void *sc_arg)
{
	struct nvme_sim_softc *sc = sc_arg;
	struct nvme_controller *ctrlr = sc->s_ctrlr;
	union ccb *ccb;

	mtx_lock(&ctrlr->lock);

	ccb = xpt_alloc_ccb_nowait();
	if (ccb == NULL) {
		printf("unable to alloc CCB for rescan\n");
		return (NULL);
	}

	if (xpt_create_path(&ccb->ccb_h.path, /*periph*/NULL,
	    cam_sim_path(sc->s_sim), 0, ns->id) != CAM_REQ_CMP) {
		printf("unable to create path for rescan\n");
		xpt_free_ccb(ccb);
		return (NULL);
	}

	xpt_rescan(ccb);

	mtx_unlock(&ctrlr->lock);

	return (ns);
}

static void
ahci_cam_rescan(struct ahci_port *ap)
{
	struct cam_path *path;
	union ccb *ccb;
	int status;
	int i;

	if (ap->ap_flags & AP_F_SCAN_RUNNING) {
		ap->ap_flags |= AP_F_SCAN_REQUESTED;
		return;
	}
	ap->ap_flags |= AP_F_SCAN_RUNNING;
	for (i = 0; i < AHCI_MAX_PMPORTS; ++i) {
		ap->ap_ata[i]->at_features |= ATA_PORT_F_RESCAN;
	}

	status = xpt_create_path(&path, xpt_periph, cam_sim_path(ap->ap_sim),
				 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
	if (status != CAM_REQ_CMP)
		return;

	ccb = xpt_alloc_ccb();
	xpt_setup_ccb(&ccb->ccb_h, path, 5);	/* 5 = low priority */
	ccb->ccb_h.func_code = XPT_ENG_EXEC;
	ccb->ccb_h.cbfcnp = ahci_cam_rescan_callback;
	ccb->ccb_h.sim_priv.entries[0].ptr = ap;
	ccb->crcn.flags = CAM_FLAG_NONE;
	xpt_action_async(ccb);
}

int
tws_bus_scan(struct tws_softc *sc)
{
    struct cam_path *path;
    union ccb       *ccb;

    TWS_TRACE_DEBUG(sc, "entry", sc, 0);
    KASSERT(sc->sim, ("sim not allocated"));
    KKASSERT(lockstatus(&sc->sim_lock, curthread) != 0);

    ccb = sc->scan_ccb;

    if (xpt_create_path(&path, xpt_periph, cam_sim_path(sc->sim),
                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
        /* lockmgr(&sc->sim_lock, LK_RELEASE); */
        return(EIO);
    }
    xpt_setup_ccb(&ccb->ccb_h, path, 5);
    ccb->ccb_h.func_code = XPT_SCAN_BUS;
    ccb->ccb_h.cbfcnp = tws_bus_scan_cb;
    ccb->crcn.flags = CAM_FLAG_NONE;
    xpt_action(ccb);

    return(0);
}

/*
 * Function name:	tw_osli_request_bus_scan
 * Description:		Requests CAM for a scan of the bus.
 *
 * Input:		sc	-- ptr to per ctlr structure
 * Output:		None
 * Return value:	0	-- success
 *			non-zero-- failure
 */
TW_INT32
tw_osli_request_bus_scan(struct twa_softc *sc)
{
	union ccb	*ccb;

	tw_osli_dbg_dprintf(3, sc, "entering");

	/* If we get here before sc->sim is initialized, return an error. */
	if (!(sc->sim))
		return(ENXIO);
	if ((ccb = xpt_alloc_ccb()) == NULL)
		return(ENOMEM);
	lockmgr(sc->sim_lock, LK_EXCLUSIVE);
	if (xpt_create_path(&ccb->ccb_h.path, xpt_periph, cam_sim_path(sc->sim),
	    CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
		xpt_free_ccb(ccb);
		lockmgr(sc->sim_lock, LK_RELEASE);
		return(EIO);
	}

	xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path, 5/*priority (low)*/);
	ccb->ccb_h.func_code = XPT_SCAN_BUS;
	ccb->ccb_h.cbfcnp = twa_bus_scan_cb;
	ccb->crcn.flags = CAM_FLAG_NONE;
	xpt_action(ccb);

	lockmgr(sc->sim_lock, LK_RELEASE);
	return(0);
}

void isci_controller_domain_discovery_complete(
    struct ISCI_CONTROLLER *isci_controller, struct ISCI_DOMAIN *isci_domain)
{
	if (!isci_controller->has_been_scanned)
	{
		/* Controller has not been scanned yet.  We'll clear
		 *  the discovery bit for this domain, then check if all bits
		 *  are now clear.  That would indicate that all domains are
		 *  done with discovery and we can then proceed with initial
		 *  scan.
		 */

		isci_controller->initial_discovery_mask &=
		    ~(1 << isci_domain->index);

		if (isci_controller->initial_discovery_mask == 0) {
			struct isci_softc *driver = isci_controller->isci;
			uint8_t next_index = isci_controller->index + 1;

			isci_controller->has_been_scanned = TRUE;

			/* Unfreeze simq to allow initial scan to proceed. */
			xpt_release_simq(isci_controller->sim, TRUE);

#if __FreeBSD_version < 800000
			/* When driver is loaded after boot, we need to
			 *  explicitly rescan here for versions <8.0, because
			 *  CAM only automatically scans new buses at boot
			 *  time.
			 */
			union ccb *ccb = xpt_alloc_ccb_nowait();

			xpt_create_path(&ccb->ccb_h.path, xpt_periph,
			    cam_sim_path(isci_controller->sim),
			    CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);

			xpt_rescan(ccb);
#endif

			if (next_index < driver->controller_count) {
				/*  There are more controllers that need to
				 *   start.  So start the next one.
				 */
				isci_controller_start(
				    &driver->controllers[next_index]);
			}
			else
			{
				/* All controllers have been started and completed discovery.
				 *  Disestablish the config hook while will signal to the
				 *  kernel during boot that it is safe to try to find and
				 *  mount the root partition.
				 */
				config_intrhook_disestablish(
				    &driver->config_hook);
			}
		}
	}
}

/*
 * vpo_attach()
 */
static int
vpo_attach(device_t dev)
{
	struct vpo_data *vpo = DEVTOSOFTC(dev);
	struct cam_devq *devq;
	int error;

	/* low level attachment */
	if (vpo->vpo_isplus) {
		if ((error = imm_attach(&vpo->vpo_io)))
			return (error);
	} else {
		if ((error = vpoio_attach(&vpo->vpo_io)))
			return (error);
	}

	/*
	**	Now tell the generic SCSI layer
	**	about our bus.
	*/
	devq = cam_simq_alloc(/*maxopenings*/1);
	/* XXX What about low-level detach on error? */
	if (devq == NULL)
		return (ENXIO);

	vpo->sim = cam_sim_alloc(vpo_action, vpo_poll, "vpo", vpo,
				 device_get_unit(dev),
				 /*untagged*/1, /*tagged*/0, devq);
	if (vpo->sim == NULL) {
		cam_simq_free(devq);
		return (ENXIO);
	}

	if (xpt_bus_register(vpo->sim, /*bus*/0) != CAM_SUCCESS) {
		cam_sim_free(vpo->sim, /*free_devq*/TRUE);
		return (ENXIO);
	}

	if (xpt_create_path(&vpo->path, /*periph*/NULL,
			    cam_sim_path(vpo->sim), CAM_TARGET_WILDCARD,
			    CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
		xpt_bus_deregister(cam_sim_path(vpo->sim));
		cam_sim_free(vpo->sim, /*free_devq*/TRUE);
		return (ENXIO);
	}

	/* all went ok */

	return (0);
}

/*
 * The state of the port has changed.
 *
 * If atx is NULL the physical port has changed state.
 * If atx is non-NULL a particular target behind a PM has changed state.
 *
 * If found is -1 the target state must be queued to a non-interrupt context.
 * (only works with at == NULL).
 *
 * If found is 0 the target was removed.
 * If found is 1 the target was inserted.
 */
void
ahci_cam_changed(struct ahci_port *ap, struct ata_port *atx, int found)
{
	struct cam_path *tmppath;
	int status;
	int target;

	target = atx ? atx->at_target : CAM_TARGET_WILDCARD;

	if (ap->ap_sim == NULL)
		return;
	if (found == CAM_TARGET_WILDCARD) {
		status = xpt_create_path(&tmppath, NULL,
					 cam_sim_path(ap->ap_sim),
					 target, CAM_LUN_WILDCARD);
		if (status != CAM_REQ_CMP)
			return;
		ahci_cam_rescan(ap);
	} else {
		status = xpt_create_path(&tmppath, NULL,
					 cam_sim_path(ap->ap_sim),
					 target,
					 CAM_LUN_WILDCARD);
		if (status != CAM_REQ_CMP)
			return;
#if 0
		/*
		 * This confuses CAM
		 */
		if (found)
			xpt_async(AC_FOUND_DEVICE, tmppath, NULL);
		else
			xpt_async(AC_LOST_DEVICE, tmppath, NULL);
#endif
	}
	xpt_free_path(tmppath);
}

void
isci_remote_device_release_lun_queue(struct ISCI_REMOTE_DEVICE *remote_device,
    lun_id_t lun)
{
	if (remote_device->frozen_lun_mask & (1 << lun)) {
		struct cam_path *path;

		remote_device->frozen_lun_mask &= ~(1 << lun);
		xpt_create_path(&path, NULL,
		    cam_sim_path(remote_device->domain->controller->sim),
		    remote_device->index, lun);
		xpt_release_devq(path, 1, TRUE);
		xpt_free_path(path);
	}
}

/*
 * Register the driver as a CAM SIM
 */
static int
aac_cam_attach(device_t dev)
{
    struct cam_devq *devq;
    struct cam_sim *sim;
    struct cam_path *path;
    struct aac_cam *camsc;
    struct aac_sim *inf;

    fwprintf(NULL, HBA_FLAGS_DBG_FUNCTION_ENTRY_B, "");

    camsc = (struct aac_cam *)device_get_softc(dev);
    inf = (struct aac_sim *)device_get_ivars(dev);
    camsc->inf = inf;

    devq = cam_simq_alloc(inf->TargetsPerBus);
    if (devq == NULL)
        return (EIO);

    sim = cam_sim_alloc(aac_cam_action, aac_cam_poll, "aacp", camsc,
                        device_get_unit(dev), &inf->aac_sc->aac_io_lock, 1, 1, devq);
    if (sim == NULL) {
        cam_simq_free(devq);
        return (EIO);
    }

    /* Since every bus has it's own sim, every bus 'appears' as bus 0 */
    mtx_lock(&inf->aac_sc->aac_io_lock);
    if (xpt_bus_register(sim, dev, 0) != CAM_SUCCESS) {
        cam_sim_free(sim, TRUE);
        mtx_unlock(&inf->aac_sc->aac_io_lock);
        return (EIO);
    }

    if (xpt_create_path(&path, NULL, cam_sim_path(sim),
                        CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
        xpt_bus_deregister(cam_sim_path(sim));
        cam_sim_free(sim, TRUE);
        mtx_unlock(&inf->aac_sc->aac_io_lock);
        return (EIO);
    }
    mtx_unlock(&inf->aac_sc->aac_io_lock);

    camsc->sim = sim;
    camsc->path = path;

    return (0);
}

void
mpt_cam_attach(mpt_softc_t *mpt)
{
	struct cam_devq *devq;
	struct cam_sim *sim;
	int maxq;

	mpt->bus = 0;
	maxq = (mpt->mpt_global_credits < MPT_MAX_REQUESTS(mpt))?
	    mpt->mpt_global_credits : MPT_MAX_REQUESTS(mpt);


	/*
	 * Create the device queue for our SIM(s).
	 */
	
	devq = cam_simq_alloc(maxq);
	if (devq == NULL) {
		return;
	}

	/*
	 * Construct our SIM entry.
	 */
	sim = cam_sim_alloc(mpt_action, mpt_poll, "mpt", mpt,
	    mpt->unit, 1, maxq, devq);
	if (sim == NULL) {
		cam_simq_free(devq);
		return;
	}

	/*
	 * Register exactly the bus.
	 */

	if (xpt_bus_register(sim, 0) != CAM_SUCCESS) {
		cam_sim_free(sim, TRUE);
		return;
	}

	if (xpt_create_path(&mpt->path, NULL, cam_sim_path(sim),
	    CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
		xpt_bus_deregister(cam_sim_path(sim));
		cam_sim_free(sim, TRUE);
		return;
	}
	mpt->sim = sim;
}

/********************************************************************************
 * Find a peripheral attahed at (bus),(target)
 */
static struct cam_periph *
mly_find_periph(struct mly_softc *sc, int bus, int target)
{
    struct cam_periph	*periph;
    struct cam_path	*path;
    int			status;

    status = xpt_create_path(&path, NULL, cam_sim_path(sc->mly_cam_sim[bus]), target, 0);
    if (status == CAM_REQ_CMP) {
	periph = cam_periph_find(path, NULL);
	xpt_free_path(path);
    } else {
	periph = NULL;
    }
    return(periph);
}