/* * Written by Julian Elischer (julian@dialix.oz.au) * for TRW Financial Systems for use under the MACH(2.5) operating system. * * TRW Financial Systems, in accordance with their agreement with Carnegie * Mellon University, makes this software available to CMU to distribute * or use in any manner that they see fit as long as this message is kept with * the software. For this reason TFS also grants any other persons or * organisations permission to use or modify this software. * * TFS supplies this software to be publicly redistributed * on the understanding that TFS is not responsible for the correct * functioning of this software in any circumstances. * * Ported to run under 386BSD by Julian Elischer (julian@dialix.oz.au) Sept 1992 * * $Id: sd.c,v 1.106 1997/06/25 19:07:43 tegge Exp $ */ #include "opt_bounce.h" #include "opt_scsi.h" #define SPLSD splbio #include #include #include #include #include #include #include #include #include #include #include #ifdef DEVFS #include #endif /*DEVFS*/ #include #include #include #include #include #include #include #include #include #include #include /* XXX *//* for aborting dump */ #ifdef PC98 #include #endif static u_int32_t sdstrats, sdqueues; #define SECSIZE 512 #ifdef PC98 #define SDOUTSTANDING 2 #else #define SDOUTSTANDING 4 #endif #define SD_RETRIES 4 #define MAXTRANSFER 8 /* 1 page at a time */ #define PARTITION(dev) dkpart(dev) #define SDUNIT(dev) dkunit(dev) /* XXX introduce a dkmodunit() macro for this. */ #define SDSETUNIT(DEV, U) \ makedev(major(DEV), dkmakeminor((U), dkslice(DEV), dkpart(DEV))) static errval sd_get_parms __P((int unit, int flags)); static errval sd_reassign_blocks __P((int unit, int block)); static u_int32_t sd_size __P((int unit, int flags)); static void sdstrategy1 __P((struct buf *)); static int sd_sense_handler __P((struct scsi_xfer *)); static void sdstart __P((u_int32_t, u_int32_t)); struct scsi_data { u_int32_t flags; #define SDINIT 0x04 /* device has been init'd */ struct disk_parms { u_char heads; /* Number of heads */ u_int16_t cyls; /* Number of cylinders */ u_char sectors; /*dubious *//* Number of sectors/track */ u_int16_t secsiz; /* Number of bytes/sector */ u_int32_t disksize; /* total number sectors */ } params; struct diskslices *dk_slices; /* virtual drives */ struct buf_queue_head buf_queue; int dkunit; /* disk stats unit number */ #ifdef DEVFS void *b_devfs_token; void *c_devfs_token; void *ctl_devfs_token; #endif }; static int sdunit(dev_t dev) { return SDUNIT(dev); } static dev_t sdsetunit(dev_t dev, int unit) { return SDSETUNIT(dev, unit); } static errval sd_open __P((dev_t dev, int mode, int fmt, struct proc *p, struct scsi_link *sc_link)); static errval sd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p, struct scsi_link *sc_link); static errval sd_close __P((dev_t dev, int fflag, int fmt, struct proc *p, struct scsi_link *sc_link)); static void sd_strategy(struct buf *bp, struct scsi_link *sc_link); static d_open_t sdopen; static d_close_t sdclose; static d_ioctl_t sdioctl; static d_dump_t sddump; static d_psize_t sdsize; static d_strategy_t sdstrategy; #define CDEV_MAJOR 13 #define BDEV_MAJOR 4 static struct cdevsw sd_cdevsw; static struct bdevsw sd_bdevsw = { sdopen, sdclose, sdstrategy, sdioctl, /*4*/ sddump, sdsize, D_DISK, "sd", &sd_cdevsw, -1 }; SCSI_DEVICE_ENTRIES(sd) static struct scsi_device sd_switch = { sd_sense_handler, sdstart, /* have a queue, served by this */ NULL, /* have no async handler */ NULL, /* Use default 'done' routine */ "sd", 0, {0, 0}, 0, /* Link flags */ sdattach, "Direct-Access", sdopen, sizeof(struct scsi_data), T_DIRECT, sdunit, sdsetunit, sd_open, sd_ioctl, sd_close, sd_strategy, }; static struct scsi_xfer sx; static inline void sd_registerdev(int unit) { if(dk_ndrive < DK_NDRIVE) { sprintf(dk_names[dk_ndrive], "sd%d", unit); dk_wpms[dk_ndrive] = (8*1024*1024/2); SCSI_DATA(&sd_switch, unit)->dkunit = dk_ndrive++; } else { SCSI_DATA(&sd_switch, unit)->dkunit = -1; } } /* * The routine called by the low level scsi routine when it discovers * a device suitable for this driver. */ static errval sdattach(struct scsi_link *sc_link) { u_int32_t unit; struct disk_parms *dp; #ifdef DEVFS int mynor; #endif struct scsi_data *sd = sc_link->sd; unit = sc_link->dev_unit; dp = &(sd->params); if (sc_link->opennings > SDOUTSTANDING) sc_link->opennings = SDOUTSTANDING; TAILQ_INIT(&sd->buf_queue); /* * Use the subdriver to request information regarding * the drive. We cannot use interrupts yet, so the * request must specify this. */ sd_get_parms(unit, SCSI_NOSLEEP | SCSI_NOMASK); /* * if we don't have actual parameters, assume 512 bytes/sec * (could happen on removable media - MOD) * -- this avoids the division below from falling over */ if(dp->secsiz == 0) dp->secsiz = SECSIZE; printf("%ldMB (%ld %d byte sectors)", dp->disksize / ((1024L * 1024L) / dp->secsiz), dp->disksize, dp->secsiz); #ifndef SCSI_REPORT_GEOMETRY if ( (sc_link->flags & SDEV_BOOTVERBOSE) ) #endif { sc_print_addr(sc_link); printf("with %d cyls, %d heads, and an average %d sectors/track", dp->cyls, dp->heads, dp->sectors); } sd->flags |= SDINIT; sd_registerdev(unit); #ifdef DEVFS mynor = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); sd->b_devfs_token = devfs_add_devswf(&sd_bdevsw, mynor, DV_BLK, UID_ROOT, GID_OPERATOR, 0640, "sd%d", unit); sd->c_devfs_token = devfs_add_devswf(&sd_cdevsw, mynor, DV_CHR, UID_ROOT, GID_OPERATOR, 0640, "rsd%d", unit); mynor = dkmakeminor(unit, 0, 0); /* XXX */ sd->ctl_devfs_token = devfs_add_devswf(&sd_cdevsw, mynor | SCSI_CONTROL_MASK, DV_CHR, UID_ROOT, GID_WHEEL, 0600, "rsd%d.ctl", unit); #endif return 0; } /* * open the device. Make sure the partition info is a up-to-date as can be. */ static errval sd_open(dev, mode, fmt, p, sc_link) dev_t dev; int mode; int fmt; struct proc *p; struct scsi_link *sc_link; { errval errcode = 0; u_int32_t unit; struct disklabel label; struct scsi_data *sd; unit = SDUNIT(dev); sd = sc_link->sd; /* * Make sure the disk has been initialised * At some point in the future, get the scsi driver * to look for a new device if we are not initted */ if ((!sd) || (!(sd->flags & SDINIT))) { return (ENXIO); } SC_DEBUG(sc_link, SDEV_DB1, ("sd_open: dev=0x%lx (unit %ld, partition %d)\n", dev, unit, PARTITION(dev))); /* * "unit attention" errors should occur here if the * drive has been restarted or the pack changed. * just ingnore the result, it's a decoy instruction * The error handlers will act on the error though * and invalidate any media information we had. */ scsi_test_unit_ready(sc_link, 0); errcode = scsi_device_lock(sc_link); if (errcode) return errcode; /* * If it's been invalidated, then forget the label */ sc_link->flags |= SDEV_OPEN; /* unit attn becomes an err now */ if (!(sc_link->flags & SDEV_MEDIA_LOADED) && sd->dk_slices != NULL) { /* * If somebody still has it open, then forbid re-entry. */ if (dsisopen(sd->dk_slices)) { errcode = ENXIO; goto bad; } dsgone(&sd->dk_slices); } /* * In case it is a funny one, tell it to start * not needed for most hard drives (ignore failure) */ scsi_start_unit(sc_link, SCSI_ERR_OK | SCSI_SILENT); /* * Check that it is still responding and ok. */ if (scsi_test_unit_ready(sc_link, 0)) { SC_DEBUG(sc_link, SDEV_DB3, ("device not reponding\n")); errcode = ENXIO; goto bad; } SC_DEBUG(sc_link, SDEV_DB3, ("device ok\n")); /* * Load the physical device parameters */ if(errcode = sd_get_parms(unit, 0)) /* sets SDEV_MEDIA_LOADED */ goto bad; switch (sd->params.secsiz) { case 512: case 1024: case 2048: break; default: printf("sd%ld: Can't deal with %d bytes logical blocks\n", unit, sd->params.secsiz); Debugger("sd"); errcode = ENXIO; goto bad; } SC_DEBUG(sc_link, SDEV_DB3, ("Params loaded ")); /* Lock the pack in. */ scsi_prevent(sc_link, PR_PREVENT, SCSI_ERR_OK | SCSI_SILENT); /* Build label for whole disk. */ bzero(&label, sizeof label); label.d_secsize = sd->params.secsiz; label.d_nsectors = sd->params.sectors; label.d_ntracks = sd->params.heads; label.d_ncylinders = sd->params.cyls; label.d_secpercyl = sd->params.heads * sd->params.sectors; if (label.d_secpercyl == 0) label.d_secpercyl = 100; /* XXX as long as it's not 0 - readdisklabel divides by it (?) */ label.d_secperunit = sd->params.disksize; /* Initialize slice tables. */ errcode = dsopen("sd", dev, fmt, &sd->dk_slices, &label, sdstrategy1, (ds_setgeom_t *)NULL, &sd_bdevsw, &sd_cdevsw); if (errcode != 0) goto bad; SC_DEBUG(sc_link, SDEV_DB3, ("Slice tables initialized ")); SC_DEBUG(sc_link, SDEV_DB3, ("open %ld %ld\n", sdstrats, sdqueues)); scsi_device_unlock(sc_link); return 0; bad: if (!dsisopen(sd->dk_slices)) { scsi_prevent(sc_link, PR_ALLOW, SCSI_ERR_OK | SCSI_SILENT); sc_link->flags &= ~SDEV_OPEN; } scsi_device_unlock(sc_link); return errcode; } /* * close the device.. only called if we are the LAST occurence of an open * device. Convenient now but usually a pain. */ static errval sd_close(dev, fflag, fmt, p, sc_link) dev_t dev; int fflag; int fmt; struct proc *p; struct scsi_link *sc_link; { struct scsi_data *sd; errval errcode; sd = sc_link->sd; errcode = scsi_device_lock(sc_link); if (errcode) return errcode; dsclose(dev, fmt, sd->dk_slices); if (!dsisopen(sd->dk_slices)) { scsi_prevent(sc_link, PR_ALLOW, SCSI_SILENT | SCSI_ERR_OK); sc_link->flags &= ~SDEV_OPEN; } scsi_device_unlock(sc_link); return (0); } /* * Actually translate the requested transfer into one the physical driver * can understand. The transfer is described by a buf and will include * only one physical transfer. */ static void sd_strategy(struct buf *bp, struct scsi_link *sc_link) { u_int32_t opri; struct scsi_data *sd; u_int32_t unit, secsize; sdstrats++; unit = SDUNIT((bp->b_dev)); sd = sc_link->sd; /* * If the device has been made invalid, error out */ if (!(sc_link->flags & SDEV_MEDIA_LOADED)) { bp->b_error = EIO; goto bad; } /* * check it's not too big a transfer for our adapter */ scsi_minphys(bp,&sd_switch); /* * Odd number of bytes or negative offset */ if (bp->b_blkno < 0 ) { bp->b_error = EINVAL; printf("sd_strategy: Negative block number: 0x%x\n", bp->b_blkno); goto bad; } secsize = sd->params.secsiz; /* make sure the blkno is scalable */ if( (bp->b_blkno % (secsize/DEV_BSIZE)) != 0 ) { bp->b_error = EINVAL; printf("sd_strategy: Block number is not multiple of sector size (2): 0x%x\n", bp->b_blkno); goto bad; } /* make sure that the transfer size is a multiple of the sector size */ if( (bp->b_bcount % secsize) != 0 ) { bp->b_error = EINVAL; printf("sd_strategy: Invalid b_bcount %d at block number: 0x%x\n", bp->b_bcount, bp->b_blkno); goto bad; } /* * Do bounds checking, adjust transfer, set b_cylin and b_pbklno. */ { int status; int sec_blk_ratio = secsize/DEV_BSIZE; /* save original block number and size */ int b_blkno = bp->b_blkno; int b_bcount = bp->b_bcount; /* replace with scaled values */ bp->b_blkno /= sec_blk_ratio; bp->b_bcount /= sec_blk_ratio; /* enforce limits and map to physical block number */ status = dscheck(bp, sd->dk_slices); /* prevent bad side effects in block system */ bp->b_blkno = b_blkno; bp->b_bcount = b_bcount; /* scale resid */ bp->b_resid *= sec_blk_ratio; /* see if the mapping failed */ if (status <= 0) goto done; /* XXX check b_resid */ } opri = SPLSD(); /* * Use a bounce buffer if necessary */ #ifdef BOUNCE_BUFFERS if (sc_link->flags & SDEV_BOUNCE) vm_bounce_alloc(bp); #endif /* * Place it in the queue of disk activities for this disk */ #ifdef SDDISKSORT tqdisksort(&sd->buf_queue, bp); #else TAILQ_INSERT_TAIL(&sd->buf_queue, bp, b_act); #endif /* * Tell the device to get going on the transfer if it's * not doing anything, otherwise just wait for completion */ sdstart(unit, 0); splx(opri); return /*0*/; bad: bp->b_flags |= B_ERROR; done: /* * Correctly set the buf to indicate a completed xfer */ bp->b_resid = bp->b_bcount; biodone(bp); return /*0*/; } static void sdstrategy1(struct buf *bp) { /* * XXX - do something to make sdstrategy() but not this block while * we're doing dsinit() and dsioctl(). */ sdstrategy(bp); } /* * sdstart looks to see if there is a buf waiting for the device * and that the device is not already busy. If both are true, * It dequeues the buf and creates a scsi command to perform the * transfer in the buf. The transfer request will call scsi_done * on completion, which will in turn call this routine again * so that the next queued transfer is performed. * The bufs are queued by the strategy routine (sdstrategy) * * This routine is also called after other non-queued requests * have been made of the scsi driver, to ensure that the queue * continues to be drained. * * must be called at the correct (highish) spl level * sdstart() is called at SPLSD from sdstrategy and scsi_done */ static void sdstart(u_int32_t unit, u_int32_t flags) { register struct scsi_link *sc_link = SCSI_LINK(&sd_switch, unit); register struct scsi_data *sd = sc_link->sd; struct buf *bp = NULL; struct scsi_rw_big cmd; u_int32_t blkno, nblk, secsize; SC_DEBUG(sc_link, SDEV_DB2, ("sdstart ")); /* * Check if the device has room for another command */ while (sc_link->opennings) { /* * there is excess capacity, but a special waits * It'll need the adapter as soon as we clear out of the * way and let it run (user level wait). */ if (sc_link->flags & SDEV_WAITING) { return; } /* * See if there is a buf with work for us to do.. */ bp = sd->buf_queue.tqh_first; if (bp == NULL) { /* yes, an assign */ return; } TAILQ_REMOVE(&sd->buf_queue, bp, b_act); /* * If the device has become invalid, abort all the * reads and writes until all files have been closed and * re-openned */ if (!(sc_link->flags & SDEV_MEDIA_LOADED)) { goto bad; } /* * We have a buf, now we know we are going to go through * With this thing.. */ secsize = sd->params.secsiz; blkno = bp->b_pblkno; if (bp->b_bcount & (secsize - 1)) { goto bad; } nblk = bp->b_bcount / secsize; /* * Fill out the scsi command */ cmd.op_code = (bp->b_flags & B_READ) ? READ_BIG : WRITE_BIG; cmd.addr_3 = (blkno & 0xff000000UL) >> 24; cmd.addr_2 = (blkno & 0xff0000) >> 16; cmd.addr_1 = (blkno & 0xff00) >> 8; cmd.addr_0 = blkno & 0xff; cmd.length2 = (nblk & 0xff00) >> 8; cmd.length1 = (nblk & 0xff); cmd.byte2 = cmd.reserved = cmd.control = 0; /* * Call the routine that chats with the adapter. * Note: we cannot sleep as we may be an interrupt */ if (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &cmd, sizeof(cmd), (u_char *) bp->b_un.b_addr, bp->b_bcount, SD_RETRIES, 10000, bp, flags | ((bp->b_flags & B_READ) ? SCSI_DATA_IN : SCSI_DATA_OUT)) == SUCCESSFULLY_QUEUED) { sdqueues++; if(sd->dkunit >= 0) { dk_xfer[sd->dkunit]++; dk_seek[sd->dkunit]++; /* don't know */ dk_wds[sd->dkunit] += bp->b_bcount >> 6; } } else { bad: printf("sd%ld: oops not queued\n", unit); bp->b_error = EIO; bp->b_flags |= B_ERROR; biodone(bp); } } } /* * Perform special action on behalf of the user * Knows about the internals of this device */ static errval sd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p, struct scsi_link *sc_link) { /* struct sd_cmd_buf *args; */ errval error; struct scsi_data *sd; /* * Find the device that the user is talking about */ sd = sc_link->sd; SC_DEBUG(sc_link, SDEV_DB1, ("sdioctl (0x%x)", cmd)); #if 0 /* Wait until we have exclusive access to the device. */ /* XXX this is how wd does it. How did we work without this? */ wdsleep(du->dk_ctrlr, "wdioct"); #endif /* * If the device is not valid.. abandon ship */ if (!(sc_link->flags & SDEV_MEDIA_LOADED)) return (EIO); if (cmd == DIOCSBAD) return (EINVAL); /* XXX */ error = scsi_device_lock(sc_link); if (error) return error; error = dsioctl("sd", dev, cmd, addr, flag, &sd->dk_slices, sdstrategy1, (ds_setgeom_t *)NULL); scsi_device_unlock(sc_link); if (error != -1) return (error); if (PARTITION(dev) != RAW_PART) return (ENOTTY); return (scsi_do_ioctl(dev, cmd, addr, flag, p, sc_link)); } /* * Find out from the device what it's capacity is */ static u_int32_t sd_size(unit, flags) int unit, flags; { struct scsi_read_cap_data rdcap; struct scsi_read_capacity scsi_cmd; u_int32_t size; struct scsi_link *sc_link = SCSI_LINK(&sd_switch, unit); /* * make up a scsi command and ask the scsi driver to do * it for you. */ bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = READ_CAPACITY; /* * If the command works, interpret the result as a 4 byte * number of blocks */ if (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), (u_char *) & rdcap, sizeof(rdcap), SD_RETRIES, 2000, NULL, flags | SCSI_DATA_IN) != 0) { printf("sd%d: could not get size\n", unit); return (0); } else { size = rdcap.addr_0 + 1; size += rdcap.addr_1 << 8; size += rdcap.addr_2 << 16; size += rdcap.addr_3 << 24; } return (size); } /* * Tell the device to map out a defective block */ static errval sd_reassign_blocks(unit, block) int unit, block; { struct scsi_reassign_blocks scsi_cmd; struct scsi_reassign_blocks_data rbdata; struct scsi_link *sc_link = SCSI_LINK(&sd_switch, unit); bzero(&scsi_cmd, sizeof(scsi_cmd)); bzero(&rbdata, sizeof(rbdata)); scsi_cmd.op_code = REASSIGN_BLOCKS; rbdata.length_msb = 0; rbdata.length_lsb = sizeof(rbdata.defect_descriptor[0]); rbdata.defect_descriptor[0].dlbaddr_3 = ((block >> 24) & 0xff); rbdata.defect_descriptor[0].dlbaddr_2 = ((block >> 16) & 0xff); rbdata.defect_descriptor[0].dlbaddr_1 = ((block >> 8) & 0xff); rbdata.defect_descriptor[0].dlbaddr_0 = ((block) & 0xff); return (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), (u_char *) & rbdata, sizeof(rbdata), SD_RETRIES, 5000, NULL, SCSI_DATA_OUT)); } #define b2tol(a) (((unsigned)(a##_1) << 8) + (unsigned)a##_0 ) /* * Get the scsi driver to send a full inquiry to the * device and use the results to fill out the disk * parameter structure. */ static errval sd_get_parms(unit, flags) int unit, flags; { struct scsi_link *sc_link = SCSI_LINK(&sd_switch, unit); struct scsi_data *sd = sc_link->sd; struct disk_parms *disk_parms = &sd->params; struct scsi_mode_sense scsi_cmd; struct scsi_mode_sense_data { struct scsi_mode_header header; struct blk_desc blk_desc; union disk_pages pages; } scsi_sense; u_int32_t sectors; /* * First check if we have it all loaded */ if (sc_link->flags & SDEV_MEDIA_LOADED) return 0; /* * do a "mode sense page 4" */ bzero(&scsi_cmd, sizeof(scsi_cmd)); scsi_cmd.op_code = MODE_SENSE; scsi_cmd.page = 4; scsi_cmd.length = 0x20; #ifdef PC98 if (sd_bios_parms(disk_parms, sc_link)) { } else #endif /* * If the command worked, use the results to fill out * the parameter structure */ if (scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd, sizeof(scsi_cmd), (u_char *) & scsi_sense, sizeof(scsi_sense), SD_RETRIES, 4000, NULL, flags | SCSI_DATA_IN) != 0) { printf("sd%d could not mode sense (4).", unit); printf(" Using ficticious geometry\n"); /* * use adaptec standard ficticious geometry * this depends on which controller (e.g. 1542C is * different. but we have to put SOMETHING here..) */ sectors = sd_size(unit, flags); disk_parms->heads = 64; disk_parms->sectors = 32; disk_parms->cyls = sectors / (64 * 32); disk_parms->secsiz = SECSIZE; disk_parms->disksize = sectors; } else { SC_DEBUG(sc_link, SDEV_DB3, ("%ld cyls, %d heads, %d precomp, %d red_write, %d land_zone\n", scsi_3btou(&scsi_sense.pages.rigid_geometry.ncyl_2), scsi_sense.pages.rigid_geometry.nheads, b2tol(scsi_sense.pages.rigid_geometry.st_cyl_wp), b2tol(scsi_sense.pages.rigid_geometry.st_cyl_rwc), b2tol(scsi_sense.pages.rigid_geometry.land_zone))); /* * KLUDGE!!(for zone recorded disks) * give a number of sectors so that sec * trks * cyls * is <= disk_size * can lead to wasted space! THINK ABOUT THIS ! */ disk_parms->heads = scsi_sense.pages.rigid_geometry.nheads; disk_parms->cyls = scsi_3btou(&scsi_sense.pages.rigid_geometry.ncyl_2); disk_parms->secsiz = scsi_3btou(scsi_sense.blk_desc.blklen); sectors = sd_size(unit, flags); disk_parms->disksize = sectors; /* Check if none of these values are zero */ if(disk_parms->heads && disk_parms->cyls) { sectors /= (disk_parms->heads * disk_parms->cyls); } else { /* set it to something reasonable */ disk_parms->heads = 64; disk_parms->cyls = sectors / (64 * 32); sectors = 32; } /* keep secsiz sane too - we may divide by it later */ if(disk_parms->secsiz == 0) disk_parms->secsiz = SECSIZE; disk_parms->sectors = sectors; /* dubious on SCSI *//*XXX */ } sc_link->flags |= SDEV_MEDIA_LOADED; return 0; } static int sdsize(dev_t dev) { struct scsi_data *sd; sd = SCSI_DATA(&sd_switch, (u_int32_t) SDUNIT(dev)); if (sd == NULL) return (-1); return (dssize(dev, &sd->dk_slices, sdopen, sdclose)); } /* * sense handler: Called to determine what to do when the * device returns a CHECK CONDITION. * * This will issue a retry when the device returns a * non-media hardware failure. The CDC-WREN IV does this * when you access it during thermal calibrarion, so the drive * is pretty useless without this. * * In general, you probably almost always would like to issue a retry * for your disk I/O. It can't hurt too much (the caller only retries * so many times) and it may save your butt. */ static int sd_sense_handler(struct scsi_xfer *xs) { struct scsi_sense_data *sense; struct scsi_inquiry_data *inqbuf; sense = &(xs->sense); /* I don't know what the heck to do with a deferred error, * so I'll just kick it back to the caller. */ if ((sense->error_code & SSD_ERRCODE) == 0x71) return SCSIRET_CONTINUE; if (((sense->error_code & SSD_ERRCODE) == 0x70) && ((sense->ext.extended.flags & SSD_KEY) == 0x05)) /* No point in retrying Illegal Requests */ return SCSIRET_CONTINUE; inqbuf = &(xs->sc_link->inqbuf); /* It is dangerous to retry on removable drives without * looking carefully at the additional sense code * and sense code qualifier and ensuring the disk hasn't changed: */ if (inqbuf->dev_qual2 & SID_REMOVABLE) return SCSIRET_CONTINUE; /* Retry all disk errors. */ scsi_sense_print(xs); if (xs->retries) printf(", retries:%d\n", xs->retries); else printf(", FAILURE\n"); return SCSIRET_DO_RETRY; } /* * dump all of physical memory into the partition specified, starting * at offset 'dumplo' into the partition. */ static errval sddump(dev_t dev) { /* dump core after a system crash */ struct disklabel *lp; register struct scsi_data *sd; /* disk unit to do the IO */ struct scsi_link *sc_link; int32_t num; /* number of sectors to write */ u_int32_t unit, part; int32_t blkoff, blknum, blkcnt = MAXTRANSFER; int32_t nblocks; char *addr; struct scsi_rw_big cmd; static int sddoingadump = 0; struct scsi_xfer *xs = &sx; errval retval; addr = (char *) 0; /* starting address */ /* toss any characters present prior to dump */ while (cncheckc() != -1) ; /* size of memory to dump */ num = Maxmem; unit = SDUNIT(dev); /* eventually support floppies? */ part = PARTITION(dev); /* file system */ sc_link = SCSI_LINK(&sd_switch, unit); if (!sc_link) return ENXIO; sd = sc_link->sd; /* was it ever initialized etc. ? */ if (!(sd->flags & SDINIT)) return (ENXIO); if ((sc_link->flags & SDEV_MEDIA_LOADED) != SDEV_MEDIA_LOADED) return (ENXIO); if (sd->dk_slices == NULL) Debugger("sddump: no slices"); if ((lp = dsgetlabel(dev, sd->dk_slices)) == NULL) return (ENXIO); /* Convert to disk sectors */ num = (u_int32_t) num * PAGE_SIZE / sd->params.secsiz; /* XXX it must be 512 */ /* check if controller active */ if (sddoingadump) return (EFAULT); nblocks = lp->d_partitions[part].p_size; blkoff = lp->d_partitions[part].p_offset; /* XXX */ blkoff += sd->dk_slices->dss_slices[dkslice(dev)].ds_offset; /* check transfer bounds against partition size */ if ((dumplo < 0) || ((dumplo + num) > nblocks)) return (EINVAL); sddoingadump = 1; blknum = dumplo + blkoff; while (num > 0) { pmap_enter(kernel_pmap, (vm_offset_t)CADDR1, trunc_page(addr), VM_PROT_READ, TRUE); /* * Fill out the scsi command */ bzero(&cmd, sizeof(cmd)); cmd.op_code = WRITE_BIG; cmd.addr_3 = (blknum & 0xff000000) >> 24; cmd.addr_2 = (blknum & 0xff0000) >> 16; cmd.addr_1 = (blknum & 0xff00) >> 8; cmd.addr_0 = blknum & 0xff; cmd.length2 = (blkcnt & 0xff00) >> 8; cmd.length1 = (blkcnt & 0xff); /* * Fill out the scsi_xfer structure * Note: we cannot sleep as we may be an interrupt * don't use scsi_scsi_cmd() as it may want * to wait for an xs. */ bzero(xs, sizeof(sx)); xs->flags |= SCSI_NOMASK | SCSI_NOSLEEP | INUSE | SCSI_DATA_OUT; xs->sc_link = sc_link; xs->retries = SD_RETRIES; xs->timeout = 10000; /* 10000 millisecs for a disk ! */ xs->cmd = (struct scsi_generic *) &cmd; xs->cmdlen = sizeof(cmd); xs->resid = 0; xs->error = XS_NOERROR; xs->bp = 0; xs->data = (u_char *) CADDR1; /* XXX use pmap_enter() */ xs->datalen = blkcnt * sd->params.secsiz; /* * Pass all this info to the scsi driver. */ retval = (*(sc_link->adapter->scsi_cmd)) (xs); switch (retval) { case SUCCESSFULLY_QUEUED: case HAD_ERROR: return (ENXIO); /* we said not to sleep! */ case COMPLETE: break; default: return (ENXIO); /* we said not to sleep! */ } /* * If we are dumping core, it may take a while. * So reassure the user and hold off any watchdogs. */ if ((unsigned)addr % (1024 * 1024) == 0) { #ifdef HW_WDOG if (wdog_tickler) (*wdog_tickler)(); #endif /* HW_WDOG */ printf("%ld ", num / 2048); } /* update block count */ num -= blkcnt; blknum += blkcnt; (int) addr += blkcnt * sd->params.secsiz; /* operator aborting dump? */ if (cncheckc() != -1) return (EINTR); } return (0); } static sd_devsw_installed = 0; static void sd_drvinit(void *unused) { if( ! sd_devsw_installed ) { bdevsw_add_generic(BDEV_MAJOR, CDEV_MAJOR, &sd_bdevsw); sd_devsw_installed = 1; } } SYSINIT(sddev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,sd_drvinit,NULL)