scsi-linux-sg.c
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上传日期:2007-01-06
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- /* @(#)scsi-linux-sg.c 1.39 99/09/17 Copyright 1997 J. Schilling */
- #ifndef lint
- static char __sccsid[] =
- "@(#)scsi-linux-sg.c 1.39 99/09/17 Copyright 1997 J. Schilling";
- #endif
- /*
- * Interface for Linux generic SCSI implementation (sg).
- *
- * This is the interface for the broken Linux SCSI generic driver.
- * This is a hack, that tries to emulate the functionality
- * of the scg driver.
- *
- * Design flaws of the sg driver:
- * - cannot see if SCSI command could not be send
- * - cannot get SCSI status byte
- * - cannot get real dma count of tranfer
- * - cannot get number of bytes valid in auto sense data
- * - to few data in auto sense (CCS/SCSI-2/SCSI-3 needs >= 18)
- *
- * This code contains support for the sg driver version 2
- *
- * Warning: you may change this source, but if you do that
- * you need to change the _scg_version and _scg_auth* string below.
- * You may not return "schily" for an SCG_AUTHOR request anymore.
- * Choose your name instead of "schily" and make clear that the version
- * string is related to a modified source.
- *
- * Copyright (c) 1997 J. Schilling
- */
- /*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #include <linux/version.h>
- #ifndef LINUX_VERSION_CODE /* Very old kernel? */
- # define LINUX_VERSION_CODE 0
- #endif
- #if LINUX_VERSION_CODE >= 0x01031a /* <linux/scsi.h> introduced in 1.3.26 */
- #if LINUX_VERSION_CODE >= 0x020000 /* <scsi/scsi.h> introduced somewhere. */
- /* Need to fine tune the ifdef so we get the transition point right. */
- #include <scsi/scsi.h>
- #else
- #include <linux/scsi.h>
- #endif
- #else
- #define __KERNEL__
- #include <linux/fs.h>
- #undef __KERNEL__
- #include "block/blk.h"
- #include "scsi/scsi.h"
- #endif
- #include "scsi/sg.h"
- /*
- * Warning: you may change this source, but if you do that
- * you need to change the _scg_version and _scg_auth* string below.
- * You may not return "schily" for an SCG_AUTHOR request anymore.
- * Choose your name instead of "schily" and make clear that the version
- * string is related to a modified source.
- */
- LOCAL char _scg_trans_version[] = "scsi-linux-sg.c-1.39"; /* The version for this transport*/
- #ifndef SCSI_IOCTL_GET_BUS_NUMBER
- #define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
- #endif
- /*
- * XXX There must be a better way than duplicating things from system include
- * XXX files. This is stolen from /usr/src/linux/drivers/scsi/scsi.h
- */
- #ifndef DID_OK
- #define DID_OK 0x00 /* NO error */
- #define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
- #define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
- #define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
- #define DID_BAD_TARGET 0x04 /* BAD target. */
- #define DID_ABORT 0x05 /* Told to abort for some other reason */
- #define DID_PARITY 0x06 /* Parity error */
- #define DID_ERROR 0x07 /* Internal error */
- #define DID_RESET 0x08 /* Reset by somebody. */
- #define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
- #endif
- /*
- * These indicate the error that occurred, and what is available.
- */
- #ifndef DRIVER_BUSY
- #define DRIVER_BUSY 0x01
- #define DRIVER_SOFT 0x02
- #define DRIVER_MEDIA 0x03
- #define DRIVER_ERROR 0x04
-
- #define DRIVER_INVALID 0x05
- #define DRIVER_TIMEOUT 0x06
- #define DRIVER_HARD 0x07
- #define DRIVER_SENSE 0x08
- #endif
- /*
- * XXX Should add extra space in buscookies and scgfiles for a "PP bus"
- * XXX and for two "ATAPI busses".
- */
- #define MAX_SCG 16 /* Max # of SCSI controllers */
- #define MAX_TGT 16
- #define MAX_LUN 8
- struct scg_local {
- int scgfile; /* Used for SG_GET_BUFSIZE ioctl()*/
- short scgfiles[MAX_SCG][MAX_TGT][MAX_LUN];
- short buscookies[MAX_SCG];
- int pgbus;
- int pack_id; /* Should be a random number */
- char *SCSIbuf;
- };
- #define scglocal(p) ((struct scg_local *)((p)->local))
- #ifdef SG_BIG_BUFF
- #define MAX_DMA_LINUX SG_BIG_BUFF /* Defined in include/scsi/sg.h */
- #else
- #define MAX_DMA_LINUX (4*1024) /* Old Linux versions */
- #endif
- #ifndef SG_MAX_SENSE
- # define SG_MAX_SENSE 16 /* Too small for CCS / SCSI-2 */
- #endif /* But cannot be changed */
- #if !defined(__i386) && !defined(i386) && !defined(mc68000)
- #define MISALIGN
- #endif
- /*#define MISALIGN*/
- /*#undef SG_GET_BUFSIZE*/
- #if defined(USE_PG) && !defined(USE_PG_ONLY)
- #include "scsi-linux-pg.c"
- #endif
- #ifdef MISALIGN
- LOCAL int scsi_getint __PR((int *ip));
- #endif
- LOCAL int scsi_send __PR((SCSI *scgp, int f, struct scg_cmd *sp));
- LOCAL BOOL sg_setup __PR((SCSI *scgp, int f, int busno, int tgt, int tlun));
- LOCAL void sg_initdev __PR((SCSI *scgp, int f));
- LOCAL int sg_mapbus __PR((SCSI *scgp, int busno, int ino));
- LOCAL BOOL sg_mapdev __PR((SCSI *scgp, int f, int *busp, int *tgtp, int *lunp,
- int *chanp, int *inop));
- LOCAL void sg_settimeout __PR((int f, int timeout));
- /*
- * Return version information for the low level SCSI transport code.
- * This has been introduced to make it easier to trace down problems
- * in applications.
- */
- EXPORT char *
- scg__version(scgp, what)
- SCSI *scgp;
- int what;
- {
- if (scgp != (SCSI *)0) {
- switch (what) {
- case SCG_VERSION:
- return (_scg_trans_version);
- /*
- * If you changed this source, you are not allowed to
- * return "schily" for the SCG_AUTHOR request.
- */
- case SCG_AUTHOR:
- return (_scg_auth_schily);
- case SCG_SCCS_ID:
- return (__sccsid);
- }
- }
- return ((char *)0);
- }
- EXPORT int
- scsi_open(scgp, device, busno, tgt, tlun)
- SCSI *scgp;
- char *device;
- int busno;
- int tgt;
- int tlun;
- {
- register int f;
- register int i;
- register int b;
- register int t;
- register int l;
- register int nopen = 0;
- char devname[64];
- if (busno >= MAX_SCG || tgt >= MAX_TGT || tlun >= MAX_LUN) {
- errno = EINVAL;
- if (scgp->errstr)
- js_snprintf(scgp->errstr, SCSI_ERRSTR_SIZE,
- "Illegal value for busno, target or lun '%d,%d,%d'",
- busno, tgt, tlun);
- return (-1);
- }
- if (scgp->local == NULL) {
- scgp->local = malloc(sizeof(struct scg_local));
- if (scgp->local == NULL)
- return (0);
- scglocal(scgp)->scgfile = -1;
- scglocal(scgp)->pgbus = -2;
- scglocal(scgp)->SCSIbuf = (char *)-1;
- scglocal(scgp)->pack_id = 5;
- for (b=0; b < MAX_SCG; b++) {
- scglocal(scgp)->buscookies[b] = (short)-1;
- for (t=0; t < MAX_TGT; t++) {
- for (l=0; l < MAX_LUN ; l++)
- scglocal(scgp)->scgfiles[b][t][l] = (short)-1;
- }
- }
- }
- if ((device != NULL && *device != ' ') || (busno == -2 && tgt == -2))
- goto openbydev;
- for (i=0; i < 32; i++) {
- sprintf(devname, "/dev/sg%d", i);
- f = open(devname, 2);
- if (f < 0) {
- if (errno != ENOENT && errno != ENXIO && errno != ENODEV) {
- if (scgp->errstr)
- js_snprintf(scgp->errstr, SCSI_ERRSTR_SIZE,
- "Cannot open '%s'", devname);
- return (0);
- }
- } else {
- if (sg_setup(scgp, f, busno, tgt, tlun))
- return (++nopen);
- if (busno < 0 && tgt < 0 && tlun < 0)
- nopen++;
- }
- }
- if (nopen == 0) for (i=0; i <= 25; i++) {
- sprintf(devname, "/dev/sg%c", i+'a');
- f = open(devname, 2);
- if (f < 0) {
- if (errno != ENOENT && errno != ENXIO && errno != ENODEV) {
- if (scgp->errstr)
- js_snprintf(scgp->errstr, SCSI_ERRSTR_SIZE,
- "Cannot open '%s'", devname);
- return (0);
- }
- } else {
- if (sg_setup(scgp, f, busno, tgt, tlun))
- return (++nopen);
- if (busno < 0 && tgt < 0 && tlun < 0)
- nopen++;
- }
- }
- openbydev:
- if (device != NULL && *device != ' ') {
- f = open(device, 2);
- if (f < 0 && errno == ENOENT)
- goto openpg;
- if (!sg_mapdev(scgp, f, &busno, &tgt, &tlun, 0, 0)) {
- close(f);
- goto openpg;
- }
- if (scgp->scsibus < 0)
- scgp->scsibus = busno;
- if (scgp->target < 0)
- scgp->target = tgt;
- if (scgp->lun < 0)
- scgp->lun = tlun;
- if (sg_setup(scgp, f, busno, tgt, tlun))
- return (++nopen);
- }
- openpg:
- #ifdef USE_PG
- nopen += pg_open(scgp, device, busno, tgt, tlun);
- #endif
- if (scgp->debug) for (b=0; b < MAX_SCG; b++) {
- printf("Bus: %d cookie: %Xn", b, scglocal(scgp)->buscookies[b]);
- for (t=0; t < MAX_TGT; t++) {
- for (l=0; l < MAX_LUN ; l++)
- if (scglocal(scgp)->scgfiles[b][t][l] != (short)-1)
- printf("file (%d,%d,%d): %dn",
- b, t, l, scglocal(scgp)->scgfiles[b][t][l]);
- }
- }
- return (nopen);
- }
- EXPORT int
- scsi_close(scgp)
- SCSI *scgp;
- {
- register int f;
- register int b;
- register int t;
- register int l;
- if (scgp->local == NULL)
- return (-1);
- for (b=0; b < MAX_SCG; b++) {
- if (b == scglocal(scgp)->pgbus)
- continue;
- scglocal(scgp)->buscookies[b] = (short)-1;
- for (t=0; t < MAX_TGT; t++) {
- for (l=0; l < MAX_LUN ; l++)
- f = scglocal(scgp)->scgfiles[b][t][l];
- if (f >= 0)
- close(f);
- scglocal(scgp)->scgfiles[b][t][l] = (short)-1;
- }
- }
- #ifdef USE_PG
- pg_close(scgp);
- #endif
- return (0);
- }
- LOCAL BOOL
- sg_setup(scgp, f, busno, tgt, tlun)
- SCSI *scgp;
- int f;
- int busno;
- int tgt;
- int tlun;
- {
- int n;
- int Chan;
- int Ino;
- int Bus;
- int Target;
- int Lun;
- BOOL onetarget = FALSE;
- if (scgp->scsibus >= 0 && scgp->target >= 0 && scgp->lun >= 0)
- onetarget = TRUE;
- sg_mapdev(scgp, f, &Bus, &Target, &Lun, &Chan, &Ino);
- /*
- * For old kernels try to make the best guess.
- */
- Ino |= Chan << 8;
- n = sg_mapbus(scgp, Bus, Ino);
- if (Bus == -1) {
- Bus = n;
- if (scgp->debug)
- printf("SCSI Bus: %d (mapped from %d)n", Bus, Ino);
- }
- if (Bus < 0 || Bus >= MAX_SCG || Target < 0 || Target >= MAX_TGT ||
- Lun < 0 || Lun >= MAX_LUN) {
- return (FALSE);
- }
- if (scglocal(scgp)->scgfiles[Bus][Target][Lun] == (short)-1)
- scglocal(scgp)->scgfiles[Bus][Target][Lun] = (short)f;
- if (onetarget) {
- if (Bus == busno && Target == tgt && Lun == tlun) {
- sg_initdev(scgp, f);
- scglocal(scgp)->scgfile = f; /* remember file for ioctl's */
- return (TRUE);
- } else {
- scglocal(scgp)->scgfiles[Bus][Target][Lun] = (short)-1;
- close(f);
- }
- } else {
- sg_initdev(scgp, f);
- if (scglocal(scgp)->scgfile < 0)
- scglocal(scgp)->scgfile = f; /* remember file for ioctl's */
- }
- return (FALSE);
- }
- LOCAL void
- sg_initdev(scgp, f)
- SCSI *scgp;
- int f;
- {
- struct sg_rep {
- struct sg_header hd;
- unsigned char rbuf[100];
- } sg_rep;
- int n;
- /* Eat any unwanted garbage from prior use of this device */
- n = fcntl(f, F_GETFL); /* Be very proper about this */
- fcntl(f, F_SETFL, n|O_NONBLOCK);
- fillbytes((caddr_t)&sg_rep, sizeof(struct sg_header), ' ');
- sg_rep.hd.reply_len = sizeof(struct sg_header);
- while (read(f, &sg_rep, sizeof(sg_rep)) >= 0 || errno != EAGAIN)
- ;
- fcntl(f, F_SETFL, n);
- sg_settimeout(f, scgp->deftimeout);
- }
- LOCAL int
- sg_mapbus(scgp, busno, ino)
- SCSI *scgp;
- int busno;
- int ino;
- {
- register int i;
- if (busno >= 0 && busno < MAX_SCG) {
- /*
- * SCSI_IOCTL_GET_BUS_NUMBER worked.
- * Now we have the problem that Linux does not properly number
- * SCSI busses. The Bus number that Linux creates really is
- * the controller (card) number. I case of multi SCSI bus
- * cards we are lost.
- */
- if (scglocal(scgp)->buscookies[busno] == (short)-1) {
- scglocal(scgp)->buscookies[busno] = ino;
- return (busno);
- }
- if (scglocal(scgp)->buscookies[busno] != (short)ino)
- errmsgno(EX_BAD, "Warning Linux Bus mapping botch.n");
- return (busno);
- } else for (i=0; i < MAX_SCG; i++) {
- if (scglocal(scgp)->buscookies[i] == (short)-1) {
- scglocal(scgp)->buscookies[i] = ino;
- return (i);
- }
- if (scglocal(scgp)->buscookies[i] == ino)
- return (i);
- }
- return (0);
- }
- LOCAL BOOL
- sg_mapdev(scgp, f, busp, tgtp, lunp, chanp, inop)
- SCSI *scgp;
- int f;
- int *busp;
- int *tgtp;
- int *lunp;
- int *chanp;
- int *inop;
- {
- struct sg_id {
- long l1; /* target | lun << 8 | channel << 16 | low_ino << 24 */
- long l2; /* Unique id */
- } sg_id;
- int Chan;
- int Ino;
- int Bus;
- int Target;
- int Lun;
- if (ioctl(f, SCSI_IOCTL_GET_IDLUN, &sg_id))
- return (FALSE);
- if (scgp->debug)
- printf("l1: 0x%lX l2: 0x%lXn", sg_id.l1, sg_id.l2);
- if (ioctl(f, SCSI_IOCTL_GET_BUS_NUMBER, &Bus) < 0) {
- Bus = -1;
- }
- Target = sg_id.l1 & 0xFF;
- Lun = (sg_id.l1 >> 8) & 0xFF;
- Chan = (sg_id.l1 >> 16) & 0xFF;
- Ino = (sg_id.l1 >> 24) & 0xFF;
- if (scgp->debug) {
- printf("Bus: %d Target: %d Lun: %d Chan: %d Ino: %dn",
- Bus, Target, Lun, Chan, Ino);
- }
- *busp = Bus;
- *tgtp = Target;
- *lunp = Lun;
- if (chanp)
- *chanp = Chan;
- if (inop)
- *inop = Ino;
- return (TRUE);
- }
- LOCAL long
- scsi_maxdma(scgp)
- SCSI *scgp;
- {
- long maxdma = MAX_DMA_LINUX;
- #ifdef SG_GET_BUFSIZE
- /*
- * We assume that all /dev/sg instances use the same
- * maximum buffer size.
- */
- if ((maxdma = ioctl(scglocal(scgp)->scgfile, SG_GET_BUFSIZE, 0)) < 0) {
- if (scglocal(scgp)->scgfile >= 0) {
- maxdma = MAX_DMA_LINUX;
- }
- }
- #endif
- #ifdef USE_PG
- if (scgp->scsibus == scglocal(scgp)->pgbus)
- return (pg_maxdma(scgp));
- if ((scgp->scsibus < 0) && (pg_maxdma(scgp) < maxdma))
- return (pg_maxdma(scgp));
- #endif
- return (maxdma);
- }
- EXPORT void *
- scsi_getbuf(scgp, amt)
- SCSI *scgp;
- long amt;
- {
- char *ret;
- if (amt <= 0 || amt > scsi_maxdma(scgp))
- return ((void *)0);
- if (scgp->debug)
- printf("scsi_getbuf: %ld bytesn", amt);
- /*
- * For performance reason, we allocate pagesize()
- * bytes before the SCSI buffer to avoid
- * copying the whole buffer contents when
- * setting up the /dev/sg data structures.
- */
- ret = valloc((size_t)(amt+getpagesize()));
- if (ret == NULL)
- return (ret);
- scgp->bufbase = ret;
- ret += getpagesize();
- scglocal(scgp)->SCSIbuf = ret;
- return ((void *)ret);
- }
- EXPORT void
- scsi_freebuf(scgp)
- SCSI *scgp;
- {
- if (scgp->bufbase)
- free(scgp->bufbase);
- scgp->bufbase = NULL;
- }
- EXPORT
- BOOL scsi_havebus(scgp, busno)
- SCSI *scgp;
- int busno;
- {
- register int t;
- register int l;
- if (busno < 0 || busno >= MAX_SCG)
- return (FALSE);
- if (scgp->local == NULL)
- return (FALSE);
- for (t=0; t < MAX_TGT; t++) {
- for (l=0; l < MAX_LUN ; l++)
- if (scglocal(scgp)->scgfiles[busno][t][l] >= 0)
- return (TRUE);
- }
- return (FALSE);
- }
- EXPORT
- int scsi_fileno(scgp, busno, tgt, tlun)
- SCSI *scgp;
- int busno;
- int tgt;
- int tlun;
- {
- if (busno < 0 || busno >= MAX_SCG ||
- tgt < 0 || tgt >= MAX_TGT ||
- tlun < 0 || tlun >= MAX_LUN)
- return (-1);
- if (scgp->local == NULL)
- return (-1);
- return ((int)scglocal(scgp)->scgfiles[busno][tgt][tlun]);
- }
- EXPORT int
- scsi_initiator_id(scgp)
- SCSI *scgp;
- {
- #ifdef USE_PG
- if (scgp->scsibus == scglocal(scgp)->pgbus)
- return (pg_initiator_id(scgp));
- #endif
- return (-1);
- }
- EXPORT
- int scsi_isatapi(scgp)
- SCSI *scgp;
- {
- #ifdef USE_PG
- if (scgp->scsibus == scglocal(scgp)->pgbus)
- return (pg_isatapi(scgp));
- #endif
- #ifdef SG_EMULATED_HOST
- {
- int emulated = FALSE;
- int f = scsi_fileno(scgp, scgp->scsibus, scgp->target, scgp->lun);
- if (ioctl(f, SG_EMULATED_HOST, &emulated) >= 0)
- return (emulated != 0);
- }
- #endif
- return (-1);
- }
- EXPORT
- int scsireset(scgp)
- SCSI *scgp;
- {
- #ifdef USE_PG
- if (scgp->scsibus == scglocal(scgp)->pgbus)
- return (pg_reset(scgp));
- #endif
- /*
- * Do we have a SCSI reset in the Linux sg driver?
- */
- return (-1);
- }
- LOCAL void
- sg_settimeout(f, tmo)
- int f;
- int tmo;
- {
- tmo *= HZ;
- if (tmo)
- tmo += HZ/2;
- if (ioctl(f, SG_SET_TIMEOUT, &tmo) < 0)
- comerr("Cannot set SG_SET_TIMEOUT.n");
- }
- /*
- * Get misaligned int.
- * Needed for all recent processors (sparc/ppc/alpha)
- * because the /dev/sg design forces us to do misaligned
- * reads of integers.
- */
- #ifdef MISALIGN
- LOCAL int
- scsi_getint(ip)
- int *ip;
- {
- int ret;
- register char *cp = (char *)ip;
- register char *tp = (char *)&ret;
- register int i;
- for (i = sizeof(int); --i >= 0; )
- *tp++ = *cp++;
-
- return (ret);
- }
- #define GETINT(a) scsi_getint(&(a))
- #else
- #define GETINT(a) (a)
- #endif
- LOCAL int
- scsi_send(scgp, f, sp)
- SCSI *scgp;
- int f;
- struct scg_cmd *sp;
- {
- struct sg_rq *sgp;
- struct sg_rq *sgp2;
- int i;
- int pack_len;
- int reply_len;
- int amt = sp->cdb_len;
- struct sg_rq {
- struct sg_header hd;
- unsigned char buf[MAX_DMA_LINUX+SCG_MAX_CMD];
- } sg_rq;
- #ifdef SG_GET_BUFSIZE /* We may use a 'sg' version 2 driver */
- char driver_byte;
- char host_byte;
- char msg_byte;
- char status_byte;
- #endif
- if (f < 0) {
- sp->error = SCG_FATAL;
- return (0);
- }
- #ifdef USE_PG
- if (scgp->scsibus == scglocal(scgp)->pgbus)
- return (pg_send(scgp, f, sp));
- #endif
- if (sp->timeout != scgp->deftimeout)
- sg_settimeout(f, sp->timeout);
- sgp2 = sgp = &sg_rq;
- if (sp->addr == scglocal(scgp)->SCSIbuf) {
- sgp = (struct sg_rq *)
- (scglocal(scgp)->SCSIbuf - (sizeof(struct sg_header) + amt));
- sgp2 = (struct sg_rq *)
- (scglocal(scgp)->SCSIbuf - (sizeof(struct sg_header)));
- } else {
- if (scgp->debug) {
- printf("DMA addr: 0x%8.8lX size: %d - using copy buffern",
- (long)sp->addr, sp->size);
- }
- if (sp->size > (int)(sizeof(sg_rq.buf) - SCG_MAX_CMD)) {
- errno = ENOMEM;
- return (-1);
- }
- }
- /*
- * This is done to avoid misaligned access of sgp->some_int
- */
- pack_len = sizeof(struct sg_header) + amt;
- reply_len = sizeof(struct sg_header);
- if (sp->flags & SCG_RECV_DATA) {
- reply_len += sp->size;
- } else {
- pack_len += sp->size;
- }
- #ifdef MISALIGN
- /*
- * sgp->some_int may be misaligned if (sp->addr == SCSIbuf)
- * This is no problem on Intel porocessors, however
- * all other processors don't like it.
- * sizeof(struct sg_header) + amt is usually not a multiple of
- * sizeof(int). For this reason, we fill in the values into sg_rq
- * which is always corectly aligned and then copy it to the real
- * location if this location differs from sg_rq.
- * Never read/write directly to sgp->some_int !!!!!
- */
- fillbytes((caddr_t)&sg_rq, sizeof(struct sg_header), ' ');
- sg_rq.hd.pack_len = pack_len;
- sg_rq.hd.reply_len = reply_len;
- sg_rq.hd.pack_id = scglocal(scgp)->pack_id++;
- /* sg_rq.hd.result = 0; not needed because of fillbytes() */
- if ((caddr_t)&sg_rq != (caddr_t)sgp)
- movebytes((caddr_t)&sg_rq, (caddr_t)sgp, sizeof(struct sg_header));
- #else
- fillbytes((caddr_t)sgp, sizeof(struct sg_header), ' ');
- sgp->hd.pack_len = pack_len;
- sgp->hd.reply_len = reply_len;
- sgp->hd.pack_id = scglocal(scgp)->pack_id++;
- /* sgp->hd.result = 0; not needed because of fillbytes() */
- #endif
- if (amt == 12)
- sgp->hd.twelve_byte = 1;
- for (i = 0; i < amt; i++ ) {
- sgp->buf[i] = sp->cdb.cmd_cdb[i];;
- }
- if (!(sp->flags & SCG_RECV_DATA)) {
- if ((void *)sp->addr != (void *)&sgp->buf[amt])
- movebytes(sp->addr, &sgp->buf[amt], sp->size);
- amt += sp->size;
- }
- #ifdef SG_GET_BUFSIZE
- sgp->hd.want_new = 1; /* Order new behaviour */
- sgp->hd.cdb_len = sp->cdb_len; /* Set CDB length */
- if (sp->sense_len > SG_MAX_SENSE)
- sgp->hd.sense_len = SG_MAX_SENSE;
- else
- sgp->hd.sense_len = sp->sense_len;
- #endif
- i = sizeof(struct sg_header) + amt;
- if ((amt = write(f, sgp, i)) < 0) { /* write */
- sg_settimeout(f, scgp->deftimeout);
- return (-1);
- } else if (amt != i) {
- errmsg("scsi_send(%s) wrote %d bytes (expected %d).n",
- scgp->cmdname, amt, i);
- }
- if (sp->addr == scglocal(scgp)->SCSIbuf) {
- movebytes(sgp, sgp2, sizeof(struct sg_header));
- sgp = sgp2;
- }
- sgp->hd.sense_buffer[0] = 0;
- if ((amt = read(f, sgp, reply_len)) < 0) { /* read */
- sg_settimeout(f, scgp->deftimeout);
- return (-1);
- }
- if (sp->flags & SCG_RECV_DATA && ((void *)sgp->buf != (void *)sp->addr)) {
- movebytes(sgp->buf, sp->addr, sp->size);
- }
- sp->ux_errno = GETINT(sgp->hd.result); /* Unaligned read */
- sp->error = SCG_NO_ERROR;
- #ifdef SG_GET_BUFSIZE
- if (sgp->hd.grant_new) {
- sp->sense_count = sgp->hd.sense_len;
- pack_len = GETINT(sgp->hd.sg_cmd_status); /* Unaligned read */
- driver_byte = (pack_len >> 24) & 0xFF;
- host_byte = (pack_len >> 16) & 0xFF;
- msg_byte = (pack_len >> 8) & 0xFF;
- status_byte = pack_len & 0xFF;
- switch (host_byte) {
- case DID_OK:
- if ((driver_byte & DRIVER_SENSE ||
- sgp->hd.sense_buffer[0] != 0)
- && status_byte == 0) {
- /*
- * The Linux SCSI system up to 2.1.xx
- * trashes the status byte in the
- * kernel. This is true at least for
- * ide-scsi emulation. Until this gets
- * fixed, we need this hack.
- */
- sp->error = SCG_RETRYABLE;
- status_byte = ST_CHK_COND;
- if (sgp->hd.sense_len == 0)
- sgp->hd.sense_len = SG_MAX_SENSE;
- }
- break;
- case DID_NO_CONNECT: /* Arbitration won, retry NO_CONNECT? */
- case DID_BAD_TARGET:
- sp->error = SCG_FATAL;
- break;
-
- case DID_TIME_OUT:
- sp->error = SCG_TIMEOUT;
- break;
- default:
- sp->error = SCG_RETRYABLE;
- if ((driver_byte & DRIVER_SENSE ||
- sgp->hd.sense_buffer[0] != 0)
- && status_byte == 0)
- status_byte = ST_CHK_COND;
- if (status_byte != 0 && sgp->hd.sense_len == 0)
- sgp->hd.sense_len = SG_MAX_SENSE;
- break;
- }
- if ((host_byte != DID_OK || status_byte != 0) && sp->ux_errno == 0)
- sp->ux_errno = EIO;
- sp->u_scb.cmd_scb[0] = status_byte;
- if (status_byte & ST_CHK_COND) {
- sp->sense_count = sgp->hd.sense_len;
- movebytes(sgp->hd.sense_buffer, sp->u_sense.cmd_sense, sp->sense_count);
- }
- } else
- #endif
- {
- if (GETINT(sgp->hd.result) == EBUSY) { /* Unaligned read */
- struct timeval to;
- to.tv_sec = sp->timeout;
- to.tv_usec = 500000;
- scsitimes(scgp);
- if (scgp->cmdstop->tv_sec < to.tv_sec ||
- (scgp->cmdstop->tv_sec == to.tv_sec &&
- scgp->cmdstop->tv_usec < to.tv_usec)) {
- sp->ux_errno = 0;
- sp->error = SCG_TIMEOUT; /* a timeout */
- } else {
- sp->error = SCG_RETRYABLE; /* may be BUS_BUSY */
- }
- }
- if (sp->flags & SCG_RECV_DATA)
- sp->resid = (sp->size + sizeof(struct sg_header)) - amt;
- else
- sp->resid = 0; /* sg version1 cannot return DMA resid count */
- if (sgp->hd.sense_buffer[0] != 0) {
- sp->error = SCG_RETRYABLE;
- sp->scb.chk = 1;
- sp->sense_count = SG_MAX_SENSE;
- movebytes(sgp->hd.sense_buffer, sp->u_sense.cmd_sense, sp->sense_count);
- if (sp->ux_errno == 0)
- sp->ux_errno = EIO;
- }
- }
- if (scgp->verbose > 0 && scgp->debug) {
- #ifdef SG_GET_BUFSIZE
- printf("status: 0x%08X pack_len: %d, reply_len: %d pack_id: %d result: %d wn: %d gn: %d cdb_len: %d sense_len: %d sense[0]: %02Xn",
- GETINT(sgp->hd.sg_cmd_status),
- GETINT(sgp->hd.pack_len),
- GETINT(sgp->hd.reply_len),
- GETINT(sgp->hd.pack_id),
- GETINT(sgp->hd.result),
- sgp->hd.want_new,
- sgp->hd.grant_new,
- sgp->hd.cdb_len,
- sgp->hd.sense_len,
- sgp->hd.sense_buffer[0]);
- #else
- printf("pack_len: %d, reply_len: %d pack_id: %d result: %d sense[0]: %02Xn",
- GETINT(sgp->hd.pack_len),
- GETINT(sgp->hd.reply_len),
- GETINT(sgp->hd.pack_id),
- GETINT(sgp->hd.result),
- sgp->hd.sense_buffer[0]);
- #endif
- #ifdef DEBUG
- printf("sense: ");
- for (i=0; i < 16; i++)
- printf("%02X ", sgp->hd.sense_buffer[i]);
- printf("n");
- #endif
- }
- if (sp->timeout != scgp->deftimeout)
- sg_settimeout(f, scgp->deftimeout);
- return 0;
- }