c8dbed028f
This switches code to using xpt_scan() routine, irrelevant to locking. Using xpt_action() directly requires knowledge about higher level locks, that SIM does not need to have. This code is obsoleted, but that is not a reason to crash. MFC after: 3 days
380 lines
9.3 KiB
C
380 lines
9.3 KiB
C
/*-
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* Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/*
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| $Id: isc_cam.c 998 2009-12-20 10:32:45Z danny $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_iscsi_initiator.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/callout.h>
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#if __FreeBSD_version >= 700000
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#endif
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#include <sys/conf.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/uio.h>
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#include <sys/sysctl.h>
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#include <sys/sx.h>
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#include <cam/cam.h>
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#include <cam/cam_ccb.h>
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#include <cam/cam_sim.h>
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#include <cam/cam_xpt_sim.h>
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#include <cam/cam_periph.h>
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#include <dev/iscsi_initiator/iscsi.h>
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#include <dev/iscsi_initiator/iscsivar.h>
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static void
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_inq(struct cam_sim *sim, union ccb *ccb)
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{
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struct ccb_pathinq *cpi = &ccb->cpi;
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isc_session_t *sp = cam_sim_softc(sim);
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debug_called(8);
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debug(3, "sid=%d target=%d lun=%jx", sp->sid, ccb->ccb_h.target_id, (uintmax_t)ccb->ccb_h.target_lun);
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cpi->version_num = 1; /* XXX??? */
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cpi->hba_inquiry = PI_SDTR_ABLE | PI_TAG_ABLE | PI_WIDE_32;
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cpi->target_sprt = 0;
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cpi->hba_misc = 0;
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cpi->hba_eng_cnt = 0;
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cpi->max_target = 0; //ISCSI_MAX_TARGETS - 1;
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cpi->initiator_id = ISCSI_MAX_TARGETS;
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cpi->max_lun = sp->opt.maxluns - 1;
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cpi->bus_id = cam_sim_bus(sim);
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cpi->base_transfer_speed = 3300; // 40000; // XXX:
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strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
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strncpy(cpi->hba_vid, "iSCSI", HBA_IDLEN);
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strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
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cpi->unit_number = cam_sim_unit(sim);
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cpi->ccb_h.status = CAM_REQ_CMP;
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#if defined(KNOB_VALID_ADDRESS)
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cpi->transport = XPORT_ISCSI;
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cpi->transport_version = 0;
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#endif
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}
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static __inline int
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_scsi_encap(struct cam_sim *sim, union ccb *ccb)
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{
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int ret;
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#if __FreeBSD_version < 700000
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ret = scsi_encap(sim, ccb);
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#else
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isc_session_t *sp = cam_sim_softc(sim);
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mtx_unlock(&sp->cam_mtx);
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ret = scsi_encap(sim, ccb);
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mtx_lock(&sp->cam_mtx);
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#endif
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return ret;
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}
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void
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ic_lost_target(isc_session_t *sp, int target)
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{
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debug_called(8);
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sdebug(2, "lost target=%d", target);
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if(sp->cam_path != NULL) {
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mtx_lock(&sp->cam_mtx);
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xpt_async(AC_LOST_DEVICE, sp->cam_path, NULL);
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xpt_free_path(sp->cam_path);
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mtx_unlock(&sp->cam_mtx);
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sp->cam_path = 0; // XXX
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}
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}
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static void
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scan_callback(struct cam_periph *periph, union ccb *ccb)
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{
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isc_session_t *sp = (isc_session_t *)ccb->ccb_h.spriv_ptr0;
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debug_called(8);
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xpt_free_ccb(ccb);
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if(sp->flags & ISC_SCANWAIT) {
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sp->flags &= ~ISC_SCANWAIT;
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wakeup(sp);
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}
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}
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static int
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ic_scan(isc_session_t *sp)
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{
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union ccb *ccb;
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debug_called(8);
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sdebug(2, "scanning sid=%d", sp->sid);
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sp->flags &= ~ISC_CAMDEVS;
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sp->flags |= ISC_SCANWAIT;
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ccb = xpt_alloc_ccb();
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ccb->ccb_h.path = sp->cam_path;
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ccb->ccb_h.cbfcnp = scan_callback;
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ccb->ccb_h.spriv_ptr0 = sp;
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xpt_rescan(ccb);
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while(sp->flags & ISC_SCANWAIT)
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tsleep(sp, PRIBIO, "ffp", 5*hz); // the timeout time should
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// be configurable
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sdebug(2, "# of luns=%d", sp->target_nluns);
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if(sp->target_nluns > 0) {
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sp->flags |= ISC_CAMDEVS;
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return 0;
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}
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return ENODEV;
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}
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static void
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ic_action(struct cam_sim *sim, union ccb *ccb)
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{
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isc_session_t *sp = cam_sim_softc(sim);
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struct ccb_hdr *ccb_h = &ccb->ccb_h;
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debug_called(8);
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ccb_h->spriv_ptr0 = sp;
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sdebug(4, "func_code=0x%x flags=0x%x status=0x%x target=%d lun=%jx retry_count=%d timeout=%d",
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ccb_h->func_code, ccb->ccb_h.flags, ccb->ccb_h.status,
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ccb->ccb_h.target_id, (uintmax_t)ccb->ccb_h.target_lun,
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ccb->ccb_h.retry_count, ccb_h->timeout);
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if(sp == NULL) {
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xdebug("sp == NULL! cannot happen");
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return;
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}
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switch(ccb_h->func_code) {
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case XPT_PATH_INQ:
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_inq(sim, ccb);
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break;
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case XPT_RESET_BUS: // (can just be a stub that does nothing and completes)
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{
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struct ccb_pathinq *cpi = &ccb->cpi;
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debug(3, "XPT_RESET_BUS");
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cpi->ccb_h.status = CAM_REQ_CMP;
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break;
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}
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case XPT_SCSI_IO:
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{
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struct ccb_scsiio* csio = &ccb->csio;
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debug(4, "XPT_SCSI_IO cmd=0x%x", csio->cdb_io.cdb_bytes[0]);
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if(sp == NULL) {
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ccb_h->status = CAM_REQ_INVALID; //CAM_NO_NEXUS;
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debug(4, "xpt_done.status=%d", ccb_h->status);
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break;
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}
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if(ccb_h->target_lun == CAM_LUN_WILDCARD) {
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debug(3, "target=%d: bad lun (-1)", ccb_h->target_id);
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ccb_h->status = CAM_LUN_INVALID;
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break;
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}
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if(_scsi_encap(sim, ccb) != 0)
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return;
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break;
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}
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case XPT_CALC_GEOMETRY:
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{
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struct ccb_calc_geometry *ccg;
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ccg = &ccb->ccg;
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debug(4, "sid=%d target=%d lun=%jx XPT_CALC_GEOMETRY vsize=%jd bsize=%d",
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sp->sid, ccb->ccb_h.target_id, (uintmax_t)ccb->ccb_h.target_lun,
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ccg->volume_size, ccg->block_size);
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if(ccg->block_size == 0 ||
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(ccg->volume_size < ccg->block_size)) {
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// print error message ...
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/* XXX: what error is appropiate? */
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break;
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}
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else {
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int lun, *off, boff;
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lun = ccb->ccb_h.target_lun;
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if(lun > ISCSI_MAX_LUNS) {
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// XXX:
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xdebug("lun %d > ISCSI_MAX_LUNS!\n", lun);
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lun %= ISCSI_MAX_LUNS;
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}
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off = &sp->target_lun[lun / (sizeof(int)*8)];
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boff = BIT(lun % (sizeof(int)*8));
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debug(4, "sp->target_nluns=%d *off=%x boff=%x",
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sp->target_nluns, *off, boff);
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if((*off & boff) == 0) {
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sp->target_nluns++;
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*off |= boff;
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}
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cam_calc_geometry(ccg, /*extended*/1);
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}
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break;
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}
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case XPT_GET_TRAN_SETTINGS:
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default:
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ccb_h->status = CAM_REQ_INVALID;
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break;
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}
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#if __FreeBSD_version < 700000
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XPT_DONE(sp, ccb);
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#else
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xpt_done(ccb);
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#endif
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return;
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}
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static void
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ic_poll(struct cam_sim *sim)
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{
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debug_called(4);
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}
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int
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ic_getCamVals(isc_session_t *sp, iscsi_cam_t *cp)
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{
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debug_called(8);
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if(sp && sp->cam_sim) {
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cp->path_id = cam_sim_path(sp->cam_sim);
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cp->target_id = 0;
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cp->target_nluns = ISCSI_MAX_LUNS; // XXX: -1?
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return 0;
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}
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return ENXIO;
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}
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void
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ic_destroy(isc_session_t *sp )
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{
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debug_called(8);
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if(sp->cam_path != NULL) {
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sdebug(2, "name=%s unit=%d",
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cam_sim_name(sp->cam_sim), cam_sim_unit(sp->cam_sim));
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CAM_LOCK(sp);
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#if 0
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xpt_async(AC_LOST_DEVICE, sp->cam_path, NULL);
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#else
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xpt_async(XPT_RESET_BUS, sp->cam_path, NULL);
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#endif
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xpt_free_path(sp->cam_path);
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xpt_bus_deregister(cam_sim_path(sp->cam_sim));
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cam_sim_free(sp->cam_sim, TRUE /*free_devq*/);
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CAM_UNLOCK(sp);
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sdebug(2, "done");
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}
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}
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int
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ic_init(isc_session_t *sp)
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{
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struct cam_sim *sim;
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struct cam_devq *devq;
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debug_called(8);
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if((devq = cam_simq_alloc(256)) == NULL)
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return ENOMEM;
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#if __FreeBSD_version >= 700000
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mtx_init(&sp->cam_mtx, "isc-cam", NULL, MTX_DEF);
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#else
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isp->cam_mtx = Giant;
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#endif
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sim = cam_sim_alloc(ic_action,
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ic_poll,
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"iscsi",
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sp,
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sp->sid, // unit
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#if __FreeBSD_version >= 700000
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&sp->cam_mtx,
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#endif
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1, // max_dev_transactions
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0, // max_tagged_dev_transactions
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devq);
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if(sim == NULL) {
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cam_simq_free(devq);
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#if __FreeBSD_version >= 700000
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mtx_destroy(&sp->cam_mtx);
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#endif
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return ENXIO;
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}
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CAM_LOCK(sp);
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if(xpt_bus_register(sim,
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#if __FreeBSD_version >= 700000
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NULL,
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#endif
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0/*bus_number*/) != CAM_SUCCESS) {
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cam_sim_free(sim, /*free_devq*/TRUE);
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CAM_UNLOCK(sp);
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#if __FreeBSD_version >= 700000
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mtx_destroy(&sp->cam_mtx);
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#endif
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return ENXIO;
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}
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sp->cam_sim = sim;
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if(xpt_create_path(&sp->cam_path, NULL, cam_sim_path(sp->cam_sim),
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CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
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xpt_bus_deregister(cam_sim_path(sp->cam_sim));
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cam_sim_free(sim, /*free_devq*/TRUE);
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CAM_UNLOCK(sp);
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#if __FreeBSD_version >= 700000
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mtx_destroy(&sp->cam_mtx);
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#endif
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return ENXIO;
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}
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CAM_UNLOCK(sp);
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sdebug(1, "cam subsystem initialized");
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ic_scan(sp);
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return 0;
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}
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