FreeBSD/Linux Kernel Cross Reference
sys/dev/amr/amr_cam.c

     /*-
      * Copyright (c) 2000 Michael Smith
      * Copyright (c) 2000 BSDi
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    /*-
     * Copyright (c) 2002 Eric Moore
     * Copyright (c) 2002 LSI Logic Corporation
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The party using or redistributing the source code and binary forms
     *    agrees to the disclaimer below and the terms and conditions set forth
     *    herein.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/malloc.h>
    #include <sys/kernel.h>
    
    #include <dev/amr/amr_compat.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/stat.h>
    
    #include <cam/cam.h>
    #include <cam/cam_ccb.h>
    #include <cam/cam_sim.h>
    #include <cam/cam_xpt.h>
    #include <cam/cam_xpt_sim.h>
    #include <cam/cam_debug.h>
    #include <cam/scsi/scsi_all.h>
    #include <cam/scsi/scsi_message.h>
    
    #include <machine/resource.h>
    #include <machine/bus.h>
    
    #include <dev/amr/amrreg.h>
    #include <dev/amr/amrvar.h>
    
    static void             amr_cam_action(struct cam_sim *sim, union ccb *ccb);
    static void             amr_cam_poll(struct cam_sim *sim);
    static void             amr_cam_complete(struct amr_command *ac);
    static void             amr_cam_complete_extcdb(struct amr_command *ac);
    
    
    /********************************************************************************
     * Enqueue/dequeue functions
     */
    static __inline void
    amr_enqueue_ccb(struct amr_softc *sc, union ccb *ccb)
    {
        int         s;
    
        s = splbio();
       TAILQ_INSERT_TAIL(&sc->amr_cam_ccbq, &ccb->ccb_h, sim_links.tqe);
       splx(s);
   }
   
   static __inline void
   amr_requeue_ccb(struct amr_softc *sc, union ccb *ccb)
   {
       int         s;
   
       s = splbio();
       TAILQ_INSERT_HEAD(&sc->amr_cam_ccbq, &ccb->ccb_h, sim_links.tqe);
       splx(s);
   }
   
   static __inline union ccb *
   amr_dequeue_ccb(struct amr_softc *sc)
   {
       union ccb   *ccb;
       int         s;
   
       s = splbio();
       if ((ccb = (union ccb *)TAILQ_FIRST(&sc->amr_cam_ccbq)) != NULL)
           TAILQ_REMOVE(&sc->amr_cam_ccbq, &ccb->ccb_h, sim_links.tqe);
       splx(s);
       return(ccb);
   }
   
   /********************************************************************************
    * Attach our 'real' SCSI channels to CAM
    */
   int
   amr_cam_attach(struct amr_softc *sc)
   {
       struct cam_devq     *devq;
       int                 chn;
   
       /* initialise the ccb queue */
       TAILQ_INIT(&sc->amr_cam_ccbq);
   
       /*
        * Allocate a devq for all our channels combined.  This should
        * allow for the maximum number of SCSI commands we will accept
        * at one time. Save the pointer in the softc so we can find it later
        * during detach.
        */
       if ((devq = cam_simq_alloc(AMR_MAX_SCSI_CMDS)) == NULL)
           return(ENOMEM);
       sc->amr_cam_devq = devq;
   
       /*
        * Iterate over our channels, registering them with CAM
        */
       for (chn = 0; chn < sc->amr_maxchan; chn++) {
   
           /* allocate a sim */
           if ((sc->amr_cam_sim[chn] = cam_sim_alloc(amr_cam_action,
                                                     amr_cam_poll,
                                                     "amr",
                                                     sc,
                                                     device_get_unit(sc->amr_dev),
                                                     1,
                                                     AMR_MAX_SCSI_CMDS,
                                                     devq)) == NULL) {
               cam_simq_free(devq);
               device_printf(sc->amr_dev, "CAM SIM attach failed\n");
               return(ENOMEM);
           }
   
           /* register the bus ID so we can get it later */
           if (xpt_bus_register(sc->amr_cam_sim[chn], chn)) {
               device_printf(sc->amr_dev, "CAM XPT bus registration failed\n");
               return(ENXIO);
           }
       }
       /*
        * XXX we should scan the config and work out which devices are actually
        * protected.
        */
       return(0);
   }
   
   /********************************************************************************
    * Disconnect ourselves from CAM
    */
   void
   amr_cam_detach(struct amr_softc *sc)
   {
       int         chn;
   
       for (chn = 0; chn < sc->amr_maxchan; chn++) {
   
           /*
            * If a sim was allocated for this channel, free it
            */
           if (sc->amr_cam_sim[chn] != NULL) {
               xpt_bus_deregister(cam_sim_path(sc->amr_cam_sim[chn]));
               cam_sim_free(sc->amr_cam_sim[chn], FALSE);
           }
       }
   
       /* Now free the devq */
       if (sc->amr_cam_devq != NULL)
           cam_simq_free(sc->amr_cam_devq);
   }
   
   /********************************************************************************
    ********************************************************************************
                                                           CAM passthrough interface
    ********************************************************************************
    ********************************************************************************/
   
   /********************************************************************************
    * Handle a request for action from CAM
    */
   static void
   amr_cam_action(struct cam_sim *sim, union ccb *ccb)
   {
       struct amr_softc    *sc = cam_sim_softc(sim);
   
       switch(ccb->ccb_h.func_code) {
   
       /*
        * Perform SCSI I/O to a physical device.
        */
       case XPT_SCSI_IO:
       {
           struct ccb_hdr          *ccbh = &ccb->ccb_h;
           struct ccb_scsiio       *csio = &ccb->csio;
   
           /* Validate the CCB */
           ccbh->status = CAM_REQ_INPROG;
   
           /* check the CDB length */
           if (csio->cdb_len > AMR_MAX_EXTCDB_LEN)
               ccbh->status = CAM_REQ_CMP_ERR;
   
           if ((csio->cdb_len > AMR_MAX_CDB_LEN) && (sc->support_ext_cdb == 0 ))
               ccbh->status = CAM_REQ_CMP_ERR;
   
           /* check that the CDB pointer is not to a physical address */
           if ((ccbh->flags & CAM_CDB_POINTER) && (ccbh->flags & CAM_CDB_PHYS))
               ccbh->status = CAM_REQ_CMP_ERR;
   
           /* if there is data transfer, it must be to/from a virtual address */
           if ((ccbh->flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
               if (ccbh->flags & CAM_DATA_PHYS)            /* we can't map it */
                   ccbh->status = CAM_REQ_CMP_ERR;         
               if (ccbh->flags & CAM_SCATTER_VALID)        /* we want to do the s/g setup */
                   ccbh->status = CAM_REQ_CMP_ERR;
           }
   
           /*
            * If the command is to a LUN other than 0, fail it.
            * This is probably incorrect, but during testing the firmware did not
            * seem to respect the LUN field, and thus devices appear echoed.
            */
           if (csio->ccb_h.target_lun != 0)
               ccbh->status = CAM_REQ_CMP_ERR;
   
           /* if we're happy with the request, queue it for attention */
           if (ccbh->status == CAM_REQ_INPROG) {
   
               /* save the channel number in the ccb */
               csio->ccb_h.sim_priv.entries[0].field = cam_sim_bus(sim);
   
               mtx_lock(&sc->amr_io_lock);
               amr_enqueue_ccb(sc, ccb);
               amr_startio(sc);
               mtx_unlock(&sc->amr_io_lock);
               return;
           }
           break;
       }
   
       case XPT_CALC_GEOMETRY:
       {
           cam_calc_geometry(&ccb->ccg, /*extended*/1);
           break;
       }
   
       /*
        * Return path stats.  Some of these should probably be
        * amended.
        */
       case XPT_PATH_INQ:
       {
           struct ccb_pathinq      *cpi = & ccb->cpi;
   
           debug(3, "XPT_PATH_INQ");
           cpi->version_num = 1;           /* XXX??? */
           cpi->hba_inquiry = PI_SDTR_ABLE|PI_TAG_ABLE|PI_WIDE_16;
           cpi->target_sprt = 0;
           cpi->hba_misc = PIM_NOBUSRESET;
           cpi->hba_eng_cnt = 0;
           cpi->max_target = AMR_MAX_TARGETS;
           cpi->max_lun = 0 /* AMR_MAX_LUNS*/;
           cpi->initiator_id = 7;          /* XXX variable? */
           strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
           strncpy(cpi->hba_vid, "LSI", HBA_IDLEN);
           strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
           cpi->unit_number = cam_sim_unit(sim);
           cpi->bus_id = cam_sim_bus(sim);
           cpi->base_transfer_speed = 132 * 1024;  /* XXX get from controller? */
           cpi->ccb_h.status = CAM_REQ_CMP;
   
           break;
       }
   
       case XPT_RESET_BUS:
       {
           struct ccb_pathinq      *cpi = & ccb->cpi;
   
           debug(1, "XPT_RESET_BUS");
           cpi->ccb_h.status = CAM_REQ_CMP;
           break;
       }
   
       case XPT_RESET_DEV:
       {
           debug(1, "XPT_RESET_DEV");
           ccb->ccb_h.status = CAM_REQ_CMP;
           break;
       }
   
       case XPT_GET_TRAN_SETTINGS:
       {
           struct ccb_trans_settings       *cts;
   
           debug(3, "XPT_GET_TRAN_SETTINGS");
   
           cts = &(ccb->cts);
   
           if ((cts->flags & CCB_TRANS_USER_SETTINGS) == 0) {
                   ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
                   break;
           }
   
           cts->flags = CCB_TRANS_DISC_ENB|CCB_TRANS_TAG_ENB;
           cts->bus_width = MSG_EXT_WDTR_BUS_32_BIT;
           cts->sync_period = 6;   /* 40MHz how wide is this bus? */
           cts->sync_offset = 31;  /* How to extract this from board? */
   
           cts->valid = CCB_TRANS_SYNC_RATE_VALID
               | CCB_TRANS_SYNC_OFFSET_VALID
               | CCB_TRANS_BUS_WIDTH_VALID
               | CCB_TRANS_DISC_VALID
               | CCB_TRANS_TQ_VALID;
           ccb->ccb_h.status = CAM_REQ_CMP;
           break;
       }
   
       case XPT_SET_TRAN_SETTINGS:
           debug(3, "XPT_SET_TRAN_SETTINGS");
           ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
           break;
   
   
       /*
        * Reject anything else as unsupported.
        */
       default:
           /* we can't do this */
           ccb->ccb_h.status = CAM_REQ_INVALID;
           break;
       }
       xpt_done(ccb);
   }
   
   /********************************************************************************
    * Convert a CAM CCB off the top of the CCB queue to a passthrough SCSI command.
    */
   int
   amr_cam_command(struct amr_softc *sc, struct amr_command **acp)
   {
       struct amr_command          *ac;
       struct amr_passthrough              *ap;
       struct amr_ext_passthrough  *aep;
       struct ccb_scsiio                   *csio;
       int                         bus, target, error;
   
       error = 0;
       ac = NULL;
       ap = NULL;
       aep = NULL;
   
       /* check to see if there is a ccb for us to work with */
       if ((csio = (struct ccb_scsiio *)amr_dequeue_ccb(sc)) == NULL)
           goto out;
   
       /* get bus/target, XXX validate against protected devices? */
       bus = csio->ccb_h.sim_priv.entries[0].field;
       target = csio->ccb_h.target_id;
   
       /*
        * Build a passthrough command.
        */
   
       /* construct passthrough */
       if (sc->support_ext_cdb ) {
               if ((aep = malloc(sizeof(*aep), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL) {
                   error = ENOMEM;
                   goto out;
               }
               aep->ap_timeout = 2;
               aep->ap_ars = 1;
               aep->ap_request_sense_length = 14;
               aep->ap_islogical = 0;
               aep->ap_channel = bus;
               aep->ap_scsi_id = target;
               aep->ap_logical_drive_no = csio->ccb_h.target_lun;
               aep->ap_cdb_length = csio->cdb_len;
               aep->ap_data_transfer_length = csio->dxfer_len;
               if (csio->ccb_h.flags & CAM_CDB_POINTER) {
                   bcopy(csio->cdb_io.cdb_ptr, aep->ap_cdb, csio->cdb_len);
               } else {
                   bcopy(csio->cdb_io.cdb_bytes, aep->ap_cdb, csio->cdb_len);
               }
               /* we leave the data s/g list and s/g count to the map routine later */
   
               debug(2, " COMMAND %x/%d+%d to %d:%d:%d", aep->ap_cdb[0], aep->ap_cdb_length, csio->dxfer_len,
                     aep->ap_channel, aep->ap_scsi_id, aep->ap_logical_drive_no);
   
       } else {
               if ((ap = malloc(sizeof(*ap), M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL) {
                   error = ENOMEM;
                   goto out;
               }
               ap->ap_timeout = 0;
               ap->ap_ars = 1;
               ap->ap_request_sense_length = 14;
               ap->ap_islogical = 0;
               ap->ap_channel = bus;
               ap->ap_scsi_id = target;
               ap->ap_logical_drive_no = csio->ccb_h.target_lun;
               ap->ap_cdb_length = csio->cdb_len;
               ap->ap_data_transfer_length = csio->dxfer_len;
               if (csio->ccb_h.flags & CAM_CDB_POINTER) {
                   bcopy(csio->cdb_io.cdb_ptr, ap->ap_cdb, csio->cdb_len);
               } else {
                   bcopy(csio->cdb_io.cdb_bytes, ap->ap_cdb, csio->cdb_len);
               }
               /* we leave the data s/g list and s/g count to the map routine later */
   
               debug(2, " COMMAND %x/%d+%d to %d:%d:%d", ap->ap_cdb[0], ap->ap_cdb_length, csio->dxfer_len,
                     ap->ap_channel, ap->ap_scsi_id, ap->ap_logical_drive_no);
       }
   
       /* construct command */
       if ((ac = amr_alloccmd(sc)) == NULL) {
           error = ENOMEM;
           goto out;
       }
   
       ac->ac_flags |= AMR_CMD_DATAOUT | AMR_CMD_DATAIN;
   
       ac->ac_ccb_data = csio->data_ptr;
       ac->ac_ccb_length = csio->dxfer_len;
       if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN)
           ac->ac_flags |= AMR_CMD_CCB_DATAIN;
       if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT)
           ac->ac_flags |= AMR_CMD_CCB_DATAOUT;
   
       ac->ac_private = csio;
       if ( sc->support_ext_cdb ) {
               ac->ac_data = aep;
               ac->ac_length = sizeof(*aep);
               ac->ac_complete = amr_cam_complete_extcdb;
               ac->ac_mailbox.mb_command = AMR_CMD_EXTPASS;
       } else {
               ac->ac_data = ap;
               ac->ac_length = sizeof(*ap);
               ac->ac_complete = amr_cam_complete;
               ac->ac_mailbox.mb_command = AMR_CMD_PASS;
       }
   
   out:
       if (error != 0) {
           if (ac != NULL)
               amr_releasecmd(ac);
           if (ap != NULL)
               free(ap, M_DEVBUF);
           if (aep != NULL)
               free(aep, M_DEVBUF);
           if (csio != NULL)                       /* put it back and try again later */
               amr_requeue_ccb(sc, (union ccb *)csio);
       }
       *acp = ac;
       return(error);
   }
   
   /********************************************************************************
    * Check for interrupt status
    */
   static void
   amr_cam_poll(struct cam_sim *sim)
   {
       struct amr_softc    *sc = cam_sim_softc(sim);
   
       mtx_lock(&sc->amr_io_lock);
       amr_done(cam_sim_softc(sim));
       mtx_unlock(&sc->amr_io_lock);
   }
   
    /********************************************************************************
    * Handle completion of a command submitted via CAM.
    */
   static void
   amr_cam_complete(struct amr_command *ac)
   {
       struct amr_passthrough      *ap = (struct amr_passthrough *)ac->ac_data;
       struct ccb_scsiio           *csio = (struct ccb_scsiio *)ac->ac_private;
       struct scsi_inquiry_data    *inq = (struct scsi_inquiry_data *)csio->data_ptr;
   
       /* XXX note that we're ignoring ac->ac_status - good idea? */
   
       debug(1, "status 0x%x  AP scsi_status 0x%x", ac->ac_status, ap->ap_scsi_status);
   
       /*
        * Hide disks from CAM so that they're not picked up and treated as 'normal' disks.
        *
        * If the configuration provides a mechanism to mark a disk a "not managed", we
        * could add handling for that to allow disks to be selectively visible.
        */
   
       if ((ap->ap_cdb[0] == INQUIRY) && (SID_TYPE(inq) == T_DIRECT)) {
           bzero(csio->data_ptr, csio->dxfer_len);
           if (ap->ap_scsi_status == 0xf0) {
               csio->ccb_h.status = CAM_SCSI_STATUS_ERROR;
           } else {
               csio->ccb_h.status = CAM_DEV_NOT_THERE;
           }
       } else {
   
           /* handle passthrough SCSI status */
           switch(ap->ap_scsi_status) {
           case 0:                         /* completed OK */
               csio->ccb_h.status = CAM_REQ_CMP;
               break;
   
           case 0x02:
               csio->ccb_h.status = CAM_SCSI_STATUS_ERROR;
               csio->scsi_status = SCSI_STATUS_CHECK_COND;
               bcopy(ap->ap_request_sense_area, &csio->sense_data, AMR_MAX_REQ_SENSE_LEN);
               csio->sense_len = AMR_MAX_REQ_SENSE_LEN;
               csio->ccb_h.status |= CAM_AUTOSNS_VALID;
               break;
   
           case 0x08:
               csio->ccb_h.status = CAM_SCSI_BUSY;
               break;
   
           case 0xf0:
           case 0xf4:
           default:
               csio->ccb_h.status = CAM_REQ_CMP_ERR;
               break;
           }
       }
       free(ap, M_DEVBUF);
       if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE)
           debug(2, "%*D\n", imin(csio->dxfer_len, 16), csio->data_ptr, " ");
       mtx_unlock(&ac->ac_sc->amr_io_lock);
       mtx_lock(&Giant);
       xpt_done((union ccb *)csio);
       mtx_unlock(&Giant);
       mtx_lock(&ac->ac_sc->amr_io_lock);
       amr_releasecmd(ac);
   }
   
   /********************************************************************************
    * Handle completion of a command submitted via CAM.
    * Completion for extended cdb
    */
   static void
   amr_cam_complete_extcdb(struct amr_command *ac)
   {
       struct amr_ext_passthrough      *aep = (struct amr_ext_passthrough *)ac->ac_data;
       struct ccb_scsiio           *csio = (struct ccb_scsiio *)ac->ac_private;
       struct scsi_inquiry_data    *inq = (struct scsi_inquiry_data *)csio->data_ptr;
   
       /* XXX note that we're ignoring ac->ac_status - good idea? */
   
       debug(1, "status 0x%x  AEP scsi_status 0x%x", ac->ac_status, aep->ap_scsi_status);
   
       /*
        * Hide disks from CAM so that they're not picked up and treated as 'normal' disks.
        *
        * If the configuration provides a mechanism to mark a disk a "not managed", we
        * could add handling for that to allow disks to be selectively visible.
        */
   
       if ((aep->ap_cdb[0] == INQUIRY) && (SID_TYPE(inq) == T_DIRECT)) {
           bzero(csio->data_ptr, csio->dxfer_len);
           if (aep->ap_scsi_status == 0xf0) {
               csio->ccb_h.status = CAM_SCSI_STATUS_ERROR;
           } else {
               csio->ccb_h.status = CAM_DEV_NOT_THERE;
           }
       } else {
   
           /* handle passthrough SCSI status */
           switch(aep->ap_scsi_status) {
           case 0:                         /* completed OK */
               csio->ccb_h.status = CAM_REQ_CMP;
               break;
   
           case 0x02:
               csio->ccb_h.status = CAM_SCSI_STATUS_ERROR;
               csio->scsi_status = SCSI_STATUS_CHECK_COND;
               bcopy(aep->ap_request_sense_area, &csio->sense_data, AMR_MAX_REQ_SENSE_LEN);
               csio->sense_len = AMR_MAX_REQ_SENSE_LEN;
               csio->ccb_h.status |= CAM_AUTOSNS_VALID;
               break;
   
           case 0x08:
               csio->ccb_h.status = CAM_SCSI_BUSY;
               break;
   
           case 0xf0:
           case 0xf4:
           default:
               csio->ccb_h.status = CAM_REQ_CMP_ERR;
               break;
           }
       }
       free(aep, M_DEVBUF);
       if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE)
           debug(2, "%*D\n", imin(csio->dxfer_len, 16), csio->data_ptr, " ");
       mtx_unlock(&ac->ac_sc->amr_io_lock);
       mtx_lock(&Giant);
       xpt_done((union ccb *)csio);
       mtx_unlock(&Giant);
       mtx_lock(&ac->ac_sc->amr_io_lock);
       amr_releasecmd(ac);
   }

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