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freebsd-dev/sys/dev/amr/amr_cam.c
dwmalone edc447e3da Further use of M_ZERO. 
Submitted by:	josh@zipperup.org
Submitted by:	Robert Drehmel <robd@gmx.net>
Approved by:	msmith
2000-11-18 15:21:22 +00:00

452 lines
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C
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/*-
* 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.
*
* $FreeBSD$
*/
#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/devicestat.h>
#include <sys/disk.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);
/********************************************************************************
* 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.
*/
if ((devq = cam_simq_alloc(AMR_MAX_SCSI_CMDS)) == NULL)
return(ENOMEM);
/*
* 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, first;
for (chn = 0, first = 1; 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], first ? TRUE : FALSE);
first = 0;
}
}
}
/********************************************************************************
********************************************************************************
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_CDB_LEN)
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);
amr_enqueue_ccb(sc, ccb);
amr_startio(sc);
return;
}
break;
}
case XPT_CALC_GEOMETRY:
{
struct ccb_calc_geometry *ccg = &ccb->ccg;
u_int32_t size_in_mb;
u_int32_t secs_per_cylinder;
size_in_mb = ccg->volume_size / ((1024L * 1024L) / ccg->block_size);
if (size_in_mb > 1024) {
ccg->heads = 255;
ccg->secs_per_track = 63;
} else {
ccg->heads = 64;
ccg->secs_per_track = 32;
}
secs_per_cylinder = ccg->heads * ccg->secs_per_track;
ccg->cylinders = ccg->volume_size / secs_per_cylinder;
ccb->ccb_h.status = CAM_REQ_CMP;
break;
}
/*
* Return path stats. Some of these should probably be
* amended.
*/
case XPT_PATH_INQ:
{
struct ccb_pathinq *cpi = & ccb->cpi;
cpi->version_num = 1; /* XXX??? */
cpi->hba_inquiry = PI_SDTR_ABLE;
cpi->target_sprt = 0;
cpi->hba_misc = 0;
cpi->hba_eng_cnt = 0;
cpi->max_target = AMR_MAX_TARGETS;
cpi->max_lun = AMR_MAX_LUNS;
cpi->initiator_id = 7; /* XXX variable? */
strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
strncpy(cpi->hba_vid, "BSDi", 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;
}
/*
* 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 ccb_scsiio *csio;
int bus, target, error;
error = 0;
ac = NULL;
ap = 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 ((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;
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_data = ap;
ac->ac_length = sizeof(*ap);
ac->ac_flags |= AMR_CMD_DATAOUT;
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_complete = amr_cam_complete;
ac->ac_private = csio;
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 (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)
{
amr_done(cam_sim_softc(sim));
}
/********************************************************************************
* 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 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 0
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 {
#else
{
#endif
/* 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, " ");
xpt_done((union ccb *)csio);
amr_releasecmd(ac);
}
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