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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- /*
- * usb/disk - usb mass storage file server
- *
- * supports only the scsi command interface, not ata.
- */
- #include <u.h>
- #include <libc.h>
- #include <ctype.h>
- #include <fcall.h>
- #include <thread.h>
- #include <disk.h>
- #include <usb/scsireq.h>
- #include <usb/usb.h>
- #include <usb/usbfs.h>
- #include <usb/ums.h>
- enum
- {
- Qdir = 0,
- Qctl,
- Qraw,
- Qdata,
- Qmax,
- };
- typedef struct Dirtab Dirtab;
- struct Dirtab
- {
- char *name;
- int mode;
- };
- static Dirtab dirtab[] =
- {
- [Qdir] = "/", DMDIR|0555,
- [Qctl] = "ctl", 0664, /* nothing secret here */
- [Qraw] = "raw", 0640,
- [Qdata] = "data", 0640,
- };
- /*
- * These are used by scuzz scsireq
- */
- int exabyte, force6bytecmds;
- int diskdebug;
- static int
- getmaxlun(Dev *dev)
- {
- uint8_t max;
- int r;
- max = 0;
- r = Rd2h|Rclass|Riface;
- if(usbcmd(dev, r, Getmaxlun, 0, 0, &max, 1) < 0){
- dprint(2, "disk: %s: getmaxlun failed: %r\n", dev->dir);
- }else{
- max &= 017; /* 15 is the max. allowed */
- dprint(2, "disk: %s: maxlun %d\n", dev->dir, max);
- }
- return max;
- }
- static int
- umsreset(Ums *ums)
- {
- int r;
- r = Rh2d|Rclass|Riface;
- if(usbcmd(ums->dev, r, Umsreset, 0, 0, nil, 0) < 0){
- fprint(2, "disk: reset: %r\n");
- return -1;
- }
- return 0;
- }
- static int
- umsrecover(Ums *ums)
- {
- if(umsreset(ums) < 0)
- return -1;
- if(unstall(ums->dev, ums->epin, Ein) < 0)
- dprint(2, "disk: unstall epin: %r\n");
- /* do we need this when epin == epout? */
- if(unstall(ums->dev, ums->epout, Eout) < 0)
- dprint(2, "disk: unstall epout: %r\n");
- return 0;
- }
- static void
- umsfatal(Ums *ums)
- {
- int i;
- devctl(ums->dev, "detach");
- for(i = 0; i < ums->maxlun; i++)
- usbfsdel(&ums->lun[i].fs);
- }
- static int
- ispow2(uint64_t ul)
- {
- return (ul & (ul - 1)) == 0;
- }
- /*
- * return smallest power of 2 >= n
- */
- static int
- log2(int n)
- {
- int i;
- for(i = 0; (1 << i) < n; i++)
- ;
- return i;
- }
- static int
- umscapacity(Umsc *lun)
- {
- uint8_t data[32];
- lun->blocks = 0;
- lun->capacity = 0;
- lun->ScsiReq.lbsize = 0;
- memset(data, 0, sizeof data);
- if(SRrcapacity(&lun->ScsiReq, data) < 0 && SRrcapacity(&lun->ScsiReq, data) < 0)
- return -1;
- lun->blocks = GETBELONG(data);
- lun->ScsiReq.lbsize = GETBELONG(data+4);
- if(lun->blocks == 0xFFFFFFFF){
- if(SRrcapacity16(&lun->ScsiReq, data) < 0){
- lun->ScsiReq.lbsize = 0;
- lun->blocks = 0;
- return -1;
- }else{
- lun->ScsiReq.lbsize = GETBELONG(data + 8);
- lun->blocks = (uint64_t)GETBELONG(data)<<32 |
- GETBELONG(data + 4);
- }
- }
- lun->blocks++; /* SRcapacity returns LBA of last block */
- lun->capacity = (int64_t)lun->blocks * lun->ScsiReq.lbsize;
- if(diskdebug)
- fprint(2, "disk: logical block size %lu, # blocks %llu\n",
- lun->ScsiReq.lbsize, lun->blocks);
- return 0;
- }
- static int
- umsinit(Ums *ums)
- {
- uint8_t i;
- Umsc *lun;
- int some;
- umsreset(ums);
- ums->maxlun = getmaxlun(ums->dev);
- ums->lun = mallocz((ums->maxlun+1) * sizeof(*ums->lun), 1);
- some = 0;
- for(i = 0; i <= ums->maxlun; i++){
- lun = &ums->lun[i];
- lun->ums = ums;
- lun->ScsiReq.umsc = lun;
- lun->ScsiReq.lun = i;
- lun->ScsiReq.flags = Fopen | Fusb | Frw10;
- if(SRinquiry(&lun->ScsiReq) < 0 && SRinquiry(&lun->ScsiReq) < 0){
- dprint(2, "disk: lun %d inquiry failed\n", i);
- continue;
- }
- switch(lun->ScsiReq.inquiry[0]){
- case Devdir:
- case Devworm: /* a little different than the others */
- case Devcd:
- case Devmo:
- break;
- default:
- fprint(2, "disk: lun %d is not a disk (type %#02x)\n",
- i, lun->ScsiReq.inquiry[0]);
- continue;
- }
- SRstart(&lun->ScsiReq, 1);
- /*
- * we ignore the device type reported by inquiry.
- * Some devices return a wrong value but would still work.
- */
- some++;
- lun->inq = smprint("%.48s", (char *)lun->ScsiReq.inquiry+8);
- umscapacity(lun);
- }
- if(some == 0){
- dprint(2, "disk: all luns failed\n");
- devctl(ums->dev, "detach");
- return -1;
- }
- return 0;
- }
- /*
- * called by SR*() commands provided by scuzz's scsireq
- */
- int32_t
- umsrequest(Umsc *umsc, ScsiPtr *cmd, ScsiPtr *data, int *status)
- {
- Cbw cbw;
- Csw csw;
- int n, nio, left;
- Ums *ums;
- ums = umsc->ums;
- memcpy(cbw.signature, "USBC", 4);
- cbw.tag = ++ums->seq;
- cbw.datalen = data->count;
- cbw.flags = data->write? CbwDataOut: CbwDataIn;
- cbw.lun = umsc->ScsiReq.lun;
- if(cmd->count < 1 || cmd->count > 16)
- fprint(2, "disk: umsrequest: bad cmd count: %ld\n", cmd->count);
- cbw.len = cmd->count;
- assert(cmd->count <= sizeof(cbw.command));
- memcpy(cbw.command, cmd->p, cmd->count);
- memset(cbw.command + cmd->count, 0, sizeof(cbw.command) - cmd->count);
- werrstr(""); /* we use %r later even for n == 0 */
- if(diskdebug){
- fprint(2, "disk: cmd: tag %#lx: ", cbw.tag);
- for(n = 0; n < cbw.len; n++)
- fprint(2, " %2.2x", cbw.command[n]&0xFF);
- fprint(2, " datalen: %ld\n", cbw.datalen);
- }
- /* issue tunnelled scsi command */
- if(write(ums->epout->dfd, &cbw, CbwLen) != CbwLen){
- fprint(2, "disk: cmd: %r\n");
- goto Fail;
- }
- /* transfer the data */
- nio = data->count;
- if(nio != 0){
- if(data->write)
- n = write(ums->epout->dfd, data->p, nio);
- else{
- n = read(ums->epin->dfd, data->p, nio);
- left = nio - n;
- if (n >= 0 && left > 0) /* didn't fill data->p? */
- memset(data->p + n, 0, left);
- }
- nio = n;
- if(diskdebug)
- if(n < 0)
- fprint(2, "disk: data: %r\n");
- else
- fprint(2, "disk: data: %d bytes\n", n);
- if(n <= 0)
- if(data->write == 0)
- unstall(ums->dev, ums->epin, Ein);
- }
- /* read the transfer's status */
- n = read(ums->epin->dfd, &csw, CswLen);
- if(n <= 0){
- /* n == 0 means "stalled" */
- unstall(ums->dev, ums->epin, Ein);
- n = read(ums->epin->dfd, &csw, CswLen);
- }
- if(n != CswLen || strncmp(csw.signature, "USBS", 4) != 0){
- dprint(2, "disk: read n=%d: status: %r\n", n);
- goto Fail;
- }
- if(csw.tag != cbw.tag){
- dprint(2, "disk: status tag mismatch\n");
- goto Fail;
- }
- if(csw.status >= CswPhaseErr){
- dprint(2, "disk: phase error\n");
- goto Fail;
- }
- if(csw.dataresidue == 0 || ums->wrongresidues)
- csw.dataresidue = data->count - nio;
- if(diskdebug){
- fprint(2, "disk: status: %2.2x residue: %ld\n",
- csw.status, csw.dataresidue);
- if(cbw.command[0] == ScmdRsense){
- fprint(2, "sense data:");
- for(n = 0; n < data->count - csw.dataresidue; n++)
- fprint(2, " %2.2x", data->p[n]);
- fprint(2, "\n");
- }
- }
- switch(csw.status){
- case CswOk:
- *status = STok;
- break;
- case CswFailed:
- *status = STcheck;
- break;
- default:
- dprint(2, "disk: phase error\n");
- goto Fail;
- }
- ums->nerrs = 0;
- return data->count - csw.dataresidue;
- Fail:
- *status = STharderr;
- if(ums->nerrs++ > 15){
- fprint(2, "disk: %s: too many errors: device detached\n", ums->dev->dir);
- umsfatal(ums);
- }else
- umsrecover(ums);
- return -1;
- }
- static int
- dwalk(Usbfs *fs, Fid *fid, char *name)
- {
- int i;
- Qid qid;
- qid = fid->qid;
- if((qid.type & QTDIR) == 0){
- werrstr("walk in non-directory");
- return -1;
- }
- if(strcmp(name, "..") == 0)
- return 0;
- for(i = 1; i < nelem(dirtab); i++)
- if(strcmp(name, dirtab[i].name) == 0){
- qid.path = i | fs->qid;
- qid.vers = 0;
- qid.type = dirtab[i].mode >> 24;
- fid->qid = qid;
- return 0;
- }
- werrstr(Enotfound);
- return -1;
- }
- static void
- dostat(Usbfs *fs, int path, Dir *d)
- {
- Dirtab *t;
- Umsc *lun;
- t = &dirtab[path];
- d->qid.path = path;
- d->qid.type = t->mode >> 24;
- d->mode = t->mode;
- d->name = t->name;
- lun = fs->aux;
- if(path == Qdata)
- d->length = lun->capacity;
- else
- d->length = 0;
- }
- static int
- dirgen(Usbfs *fs, Qid _1, int i, Dir *d, void*_2)
- {
- i++; /* skip dir */
- if(i >= Qmax)
- return -1;
- else{
- dostat(fs, i, d);
- d->qid.path |= fs->qid;
- return 0;
- }
- }
- static int
- dstat(Usbfs *fs, Qid qid, Dir *d)
- {
- int path;
- path = qid.path & ~fs->qid;
- dostat(fs, path, d);
- d->qid.path |= fs->qid;
- return 0;
- }
- static int
- dopen(Usbfs *fs, Fid *fid, int _1)
- {
- uint32_t path;
- Umsc *lun;
- path = fid->qid.path & ~fs->qid;
- lun = fs->aux;
- switch(path){
- case Qraw:
- lun->phase = Pcmd;
- break;
- }
- return 0;
- }
- /*
- * check i/o parameters and compute values needed later.
- * we shift & mask manually to avoid run-time calls to _divv and _modv,
- * since we don't need general division nor its cost.
- */
- static int
- setup(Umsc *lun, char *data, int count, int64_t offset)
- {
- int32_t nb, lbsize, lbshift, lbmask;
- uint64_t bno;
- if(count < 0 || lun->ScsiReq.lbsize <= 0 && umscapacity(lun) < 0 ||
- lun->ScsiReq.lbsize == 0)
- return -1;
- lbsize = lun->ScsiReq.lbsize;
- assert(ispow2(lbsize));
- lbshift = log2(lbsize);
- lbmask = lbsize - 1;
- bno = offset >> lbshift; /* offset / lbsize */
- nb = ((offset + count + lbsize - 1) >> lbshift) - bno;
- if(bno + nb > lun->blocks) /* past end of device? */
- nb = lun->blocks - bno;
- if(nb * lbsize > Maxiosize)
- nb = Maxiosize / lbsize;
- lun->nb = nb;
- if(bno >= lun->blocks || nb == 0)
- return 0;
- lun->ScsiReq.offset = bno;
- lun->off = offset & lbmask; /* offset % lbsize */
- if(lun->off == 0 && (count & lbmask) == 0)
- lun->bufp = data;
- else
- /* not transferring full, aligned blocks; need intermediary */
- lun->bufp = lun->buf;
- return count;
- }
- /*
- * Upon SRread/SRwrite errors we assume the medium may have changed,
- * and ask again for the capacity of the media.
- * BUG: How to proceed to avoid confusing dossrv??
- *
- * ctl reads must match the format documented in sd(3) exactly
- * to interoperate with the rest of the system.
- */
- static int32_t
- dread(Usbfs *fs, Fid *fid, void *data, int32_t count, int64_t offset)
- {
- int32_t n;
- uint32_t path;
- char buf[1024];
- char *s, *e;
- Umsc *lun;
- Ums *ums;
- Qid q;
- q = fid->qid;
- path = fid->qid.path & ~fs->qid;
- ums = fs->dev->aux;
- lun = fs->aux;
- qlock(&ums->QLock);
- switch(path){
- case Qdir:
- count = usbdirread(fs, q, data, count, offset, dirgen, nil);
- break;
- case Qctl:
- /*
- * Some usb disks need an extra opportunity to divulge their
- * capacity (e.g. M-Systems/SanDisk 1GB flash drive).
- */
- if(lun->ScsiReq.lbsize <= 0)
- umscapacity(lun);
- s = buf;
- e = buf + sizeof(buf);
- if(lun->ScsiReq.flags & Finqok)
- s = seprint(s, e, "inquiry %s lun %ld: %s\n",
- fs->dev->dir, lun - &ums->lun[0], lun->inq);
- if(lun->blocks > 0)
- s = seprint(s, e, "geometry %llu %ld\n",
- lun->blocks, lun->ScsiReq.lbsize);
- count = usbreadbuf(data, count, offset, buf, s - buf);
- break;
- case Qraw:
- if(lun->ScsiReq.lbsize <= 0 && umscapacity(lun) < 0){
- count = -1;
- break;
- }
- switch(lun->phase){
- case Pcmd:
- qunlock(&ums->QLock);
- werrstr("phase error");
- return -1;
- case Pdata:
- lun->ScsiReq.data.p = data;
- lun->ScsiReq.data.count = count;
- lun->ScsiReq.data.write = 0;
- count = umsrequest(lun,&lun->ScsiReq.cmd,&lun->ScsiReq.data,&lun->ScsiReq.status);
- lun->phase = Pstatus;
- if(count < 0)
- lun->ScsiReq.lbsize = 0; /* medium may have changed */
- break;
- case Pstatus:
- n = snprint(buf, sizeof buf, "%11.0u ", lun->ScsiReq.status);
- count = usbreadbuf(data, count, 0LL, buf, n);
- lun->phase = Pcmd;
- break;
- }
- break;
- case Qdata:
- count = setup(lun, data, count, offset);
- if (count <= 0)
- break;
- n = SRread(&lun->ScsiReq, lun->bufp, lun->nb * lun->ScsiReq.lbsize);
- if(n < 0){
- lun->ScsiReq.lbsize = 0; /* medium may have changed */
- count = -1;
- } else if (lun->bufp == data)
- count = n;
- else{
- /*
- * if n == lun->nb*lun->lbsize (as expected),
- * just copy count bytes.
- */
- if(lun->off + count > n)
- count = n - lun->off; /* short read */
- if(count > 0)
- memmove(data, lun->bufp + lun->off, count);
- }
- break;
- }
- qunlock(&ums->QLock);
- return count;
- }
- static int32_t
- dwrite(Usbfs *fs, Fid *fid, void *data, int32_t count, int64_t offset)
- {
- int32_t len, ocount;
- uint32_t path;
- uint64_t bno;
- Ums *ums;
- Umsc *lun;
- ums = fs->dev->aux;
- lun = fs->aux;
- path = fid->qid.path & ~fs->qid;
- qlock(&ums->QLock);
- switch(path){
- default:
- werrstr(Eperm);
- count = -1;
- break;
- case Qctl:
- dprint(2, "usb/disk: ctl ignored\n");
- break;
- case Qraw:
- if(lun->ScsiReq.lbsize <= 0 && umscapacity(lun) < 0){
- count = -1;
- break;
- }
- switch(lun->phase){
- case Pcmd:
- if(count != 6 && count != 10){
- qunlock(&ums->QLock);
- werrstr("bad command length");
- return -1;
- }
- memmove(lun->rawcmd, data, count);
- lun->ScsiReq.cmd.p = lun->rawcmd;
- lun->ScsiReq.cmd.count = count;
- lun->ScsiReq.cmd.write = 1;
- lun->phase = Pdata;
- break;
- case Pdata:
- lun->ScsiReq.data.p = data;
- lun->ScsiReq.data.count = count;
- lun->ScsiReq.data.write = 1;
- count = umsrequest(lun,&lun->ScsiReq.cmd,&lun->ScsiReq.data,&lun->ScsiReq.status);
- lun->phase = Pstatus;
- if(count < 0)
- lun->ScsiReq.lbsize = 0; /* medium may have changed */
- break;
- case Pstatus:
- lun->phase = Pcmd;
- werrstr("phase error");
- count = -1;
- break;
- }
- break;
- case Qdata:
- len = ocount = count;
- count = setup(lun, data, count, offset);
- if (count <= 0)
- break;
- bno = lun->ScsiReq.offset;
- if (lun->bufp == lun->buf) {
- count = SRread(&lun->ScsiReq, lun->bufp, lun->nb * lun->ScsiReq.lbsize);
- if(count < 0) {
- lun->ScsiReq.lbsize = 0; /* medium may have changed */
- break;
- }
- /*
- * if count == lun->nb*lun->lbsize, as expected, just
- * copy len (the original count) bytes of user data.
- */
- if(lun->off + len > count)
- len = count - lun->off; /* short read */
- if(len > 0)
- memmove(lun->bufp + lun->off, data, len);
- }
- lun->ScsiReq.offset = bno;
- count = SRwrite(&lun->ScsiReq, lun->bufp, lun->nb * lun->ScsiReq.lbsize);
- if(count < 0)
- lun->ScsiReq.lbsize = 0; /* medium may have changed */
- else{
- if(lun->off + len > count)
- count -= lun->off; /* short write */
- /* never report more bytes written than requested */
- if(count < 0)
- count = 0;
- else if(count > ocount)
- count = ocount;
- }
- break;
- }
- qunlock(&ums->QLock);
- return count;
- }
- int
- findendpoints(Ums *ums)
- {
- Ep *ep;
- Usbdev *ud;
- uint32_t csp, sc;
- int i, epin, epout;
- epin = epout = -1;
- ud = ums->dev->usb;
- for(i = 0; i < nelem(ud->ep); i++){
- if((ep = ud->ep[i]) == nil)
- continue;
- csp = ep->iface->csp;
- sc = Subclass(csp);
- if(!(Class(csp) == Clstorage && (Proto(csp) == Protobulk)))
- continue;
- if(sc != Subatapi && sc != Sub8070 && sc != Subscsi)
- fprint(2, "disk: subclass %#lx not supported. trying anyway\n", sc);
- if(ep->type == Ebulk){
- if(ep->dir == Eboth || ep->dir == Ein)
- if(epin == -1)
- epin = ep->id;
- if(ep->dir == Eboth || ep->dir == Eout)
- if(epout == -1)
- epout = ep->id;
- }
- }
- dprint(2, "disk: ep ids: in %d out %d\n", epin, epout);
- if(epin == -1 || epout == -1)
- return -1;
- ums->epin = openep(ums->dev, epin);
- if(ums->epin == nil){
- fprint(2, "disk: openep %d: %r\n", epin);
- return -1;
- }
- if(epout == epin){
- incref(&ums->epin->Ref);
- ums->epout = ums->epin;
- }else
- ums->epout = openep(ums->dev, epout);
- if(ums->epout == nil){
- fprint(2, "disk: openep %d: %r\n", epout);
- closedev(ums->epin);
- return -1;
- }
- if(ums->epin == ums->epout)
- opendevdata(ums->epin, ORDWR);
- else{
- opendevdata(ums->epin, OREAD);
- opendevdata(ums->epout, OWRITE);
- }
- if(ums->epin->dfd < 0 || ums->epout->dfd < 0){
- fprint(2, "disk: open i/o ep data: %r\n");
- closedev(ums->epin);
- closedev(ums->epout);
- return -1;
- }
- dprint(2, "disk: ep in %s out %s\n", ums->epin->dir, ums->epout->dir);
- devctl(ums->epin, "timeout 2000");
- devctl(ums->epout, "timeout 2000");
- if(usbdebug > 1 || diskdebug > 2){
- devctl(ums->epin, "debug 1");
- devctl(ums->epout, "debug 1");
- devctl(ums->dev, "debug 1");
- }
- return 0;
- }
- static int
- usage(void)
- {
- werrstr("usage: usb/disk [-d] [-N nb]");
- return -1;
- }
- static void
- umsdevfree(void *a)
- {
- Ums *ums = a;
- if(ums == nil)
- return;
- closedev(ums->epin);
- closedev(ums->epout);
- ums->epin = ums->epout = nil;
- free(ums->lun);
- free(ums);
- }
- static Usbfs diskfs = {
- .walk = dwalk,
- .open = dopen,
- .read = dread,
- .write = dwrite,
- .stat = dstat,
- };
- int
- diskmain(Dev *dev, int argc, char **argv)
- {
- Ums *ums;
- Umsc *lun;
- int i, devid;
- devid = dev->id;
- ARGBEGIN{
- case 'd':
- scsidebug(diskdebug);
- diskdebug++;
- break;
- case 'N':
- devid = atoi(EARGF(usage()));
- break;
- default:
- return usage();
- }ARGEND
- if(argc != 0) {
- return usage();
- }
- // notify(ding);
- ums = dev->aux = emallocz(sizeof(Ums), 1);
- ums->maxlun = -1;
- ums->dev = dev;
- dev->free = umsdevfree;
- if(findendpoints(ums) < 0){
- werrstr("disk: endpoints not found");
- return -1;
- }
- /*
- * SanDISK 512M gets residues wrong.
- */
- if(dev->usb->vid == 0x0781 && dev->usb->did == 0x5150)
- ums->wrongresidues = 1;
- if(umsinit(ums) < 0){
- dprint(2, "disk: umsinit: %r\n");
- return -1;
- }
- for(i = 0; i <= ums->maxlun; i++){
- lun = &ums->lun[i];
- lun->fs = diskfs;
- snprint(lun->fs.name, sizeof(lun->fs.name), "sdU%d.%d", devid, i);
- lun->fs.dev = dev;
- incref(&dev->Ref);
- lun->fs.aux = lun;
- usbfsadd(&lun->fs);
- }
- return 0;
- }
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