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NetBSD/sys/dev/scsipi/scsi_base.c

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/*
* Written by Julian Elischer (julian@dialix.oz.au)
* $Id: scsi_base.c,v 1.8 1994/02/16 00:47:35 mycroft Exp $
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <scsi/scsi_all.h>
#include <scsi/scsi_disk.h>
#include <scsi/scsiconf.h>
#ifdef DDB
int Debugger();
#else /* DDB */
#define Debugger()
#endif /* DDB */
void sc_print_addr __P((struct scsi_link *sc_link));
struct scsi_xfer *next_free_xs;
/*
* Get a scsi transfer structure for the caller. Charge the structure
* to the device that is referenced by the sc_link structure. If the
* sc_link structure has no 'credits' then the device already has the
* maximum number or outstanding operations under way. In this stage,
* wait on the structure so that when one is freed, we are awoken again
* If the SCSI_NOSLEEP flag is set, then do not wait, but rather, return
* a NULL pointer, signifying that no slots were available
* Note in the link structure, that we are waiting on it.
*/
struct scsi_xfer *
get_xs(sc_link, flags)
struct scsi_link *sc_link; /* who to charge the xs to */
u_int32 flags; /* if this call can sleep */
{
struct scsi_xfer *xs;
u_int32 s;
SC_DEBUG(sc_link, SDEV_DB3, ("get_xs\n"));
s = splbio();
while (!sc_link->opennings) {
SC_DEBUG(sc_link, SDEV_DB3, ("sleeping\n"));
if (flags & SCSI_NOSLEEP) {
splx(s);
return 0;
}
sc_link->flags |= SDEV_WAITING;
(void) tsleep(sc_link, PRIBIO, "get_xs", 0);
}
sc_link->opennings--;
if (xs = next_free_xs) {
next_free_xs = xs->next;
splx(s);
} else {
splx(s);
SC_DEBUG(sc_link, SDEV_DB3, ("making\n"));
xs = malloc(sizeof(*xs), M_TEMP,
((flags & SCSI_NOSLEEP) ? M_NOWAIT : M_WAITOK));
if (xs == NULL) {
sc_print_addr(sc_link);
printf("cannot allocate scsi xs\n");
return (NULL);
}
}
SC_DEBUG(sc_link, SDEV_DB3, ("returning\n"));
xs->sc_link = sc_link;
return (xs);
}
/*
* Given a scsi_xfer struct, and a device (referenced through sc_link)
* return the struct to the free pool and credit the device with it
* If another process is waiting for an xs, do a wakeup, let it proceed
*/
void
free_xs(xs, sc_link, flags)
struct scsi_xfer *xs;
struct scsi_link *sc_link; /* who to credit for returning it */
u_int32 flags;
{
xs->next = next_free_xs;
next_free_xs = xs;
SC_DEBUG(sc_link, SDEV_DB3, ("free_xs\n"));
/* if was 0 and someone waits, wake them up */
if ((!sc_link->opennings++) && (sc_link->flags & SDEV_WAITING)) {
sc_link->flags &= ~SDEV_WAITING;
wakeup(sc_link); /* remember, it wakes them ALL up */
} else {
if (sc_link->device->start) {
SC_DEBUG(sc_link, SDEV_DB2, ("calling private start()\n"));
(*(sc_link->device->start)) (sc_link->dev_unit);
}
}
}
/*
* Find out from the device what its capacity is.
*/
u_int32
scsi_size(sc_link, flags)
struct scsi_link *sc_link;
u_int32 flags;
{
struct scsi_read_cap_data rdcap;
struct scsi_read_capacity scsi_cmd;
u_int32 size;
/*
* 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),
2, 20000, NULL, flags | SCSI_DATA_IN) != 0) {
sc_print_addr(sc_link);
printf("could not get size\n");
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);
}
/*
* Get scsi driver to send a "are you ready?" command
*/
int
scsi_test_unit_ready(sc_link, flags)
struct scsi_link *sc_link;
u_int32 flags;
{
struct scsi_test_unit_ready scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = TEST_UNIT_READY;
return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd), 0, 0, 2, 100000, NULL, flags);
}
/*
* Do a scsi operation, asking a device to run as SCSI-II if it can.
*/
int
scsi_change_def(sc_link, flags)
struct scsi_link *sc_link;
u_int32 flags;
{
struct scsi_changedef scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = CHANGE_DEFINITION;
scsi_cmd.how = SC_SCSI_2;
return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd), 0, 0, 2, 100000, NULL, flags);
}
/*
* Do a scsi operation asking a device what it is
* Use the scsi_cmd routine in the switch table.
*/
int
scsi_inquire(sc_link, inqbuf, flags)
struct scsi_link *sc_link;
struct scsi_inquiry_data *inqbuf;
u_int32 flags;
{
struct scsi_inquiry scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = INQUIRY;
scsi_cmd.length = sizeof(struct scsi_inquiry_data);
return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd), (u_char *) inqbuf,
sizeof(struct scsi_inquiry_data), 2, 100000, NULL,
SCSI_DATA_IN | flags);
}
/*
* Prevent or allow the user to remove the media
*/
int
scsi_prevent(sc_link, type, flags)
struct scsi_link *sc_link;
u_int32 type, flags;
{
struct scsi_prevent scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = PREVENT_ALLOW;
scsi_cmd.how = type;
return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd), 0, 0, 2, 5000, NULL, flags);
}
/*
* Get scsi driver to send a "start up" command
*/
int
scsi_start_unit(sc_link, flags)
struct scsi_link *sc_link;
u_int32 flags;
{
struct scsi_start_stop scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = START_STOP;
scsi_cmd.how = SSS_START;
return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd), 0, 0, 2, 6000, NULL, flags);
}
/*
* Get scsi driver to send a "stop" command
*/
int
scsi_stop_unit(sc_link, eject, flags)
struct scsi_link *sc_link;
u_int32 eject;
u_int32 flags;
{
struct scsi_start_stop scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = START_STOP;
if (eject)
scsi_cmd.how = SSS_LOEJ;
else
scsi_cmd.how = SSS_STOP;
return scsi_scsi_cmd(sc_link, (struct scsi_generic *) &scsi_cmd,
sizeof(scsi_cmd), 0, 0, 2, 2000, NULL, flags);
}
/*
* This routine is called by the scsi interrupt when the transfer is complete.
*/
void
scsi_done(xs)
struct scsi_xfer *xs;
{
struct scsi_link *sc_link = xs->sc_link;
struct buf *bp = xs->bp;
int retval;
SC_DEBUG(sc_link, SDEV_DB2, ("scsi_done\n"));
#ifdef SCSIDEBUG
if (sc_link->flags & SDEV_DB1)
show_scsi_cmd(xs);
#endif /*SCSIDEBUG */
/*
* If it's a user level request, bypass all usual completion processing,
* let the user work it out.. We take reponsibility for freeing the
* xs when the user returns. (and restarting the device's queue).
*/
if (xs->flags & SCSI_USER) {
biodone(xs->bp);
#ifdef NOTNOW
SC_DEBUG(sc_link, SDEV_DB3, ("calling user done()\n"));
scsi_user_done(xs); /* to take a copy of the sense etc. */
SC_DEBUG(sc_link, SDEV_DB3, ("returned from user done()\n "));
#endif
free_xs(xs, sc_link, SCSI_NOSLEEP); /* restarts queue too */
SC_DEBUG(sc_link, SDEV_DB3, ("returning to adapter\n"));
return;
}
/*
* If the device has it's own done routine, call it first.
* If it returns a legit error value, return that, otherwise
* it wants us to continue with normal processing.
*/
if (sc_link->device->done) {
SC_DEBUG(sc_link, SDEV_DB2, ("calling private done()\n"));
retval = (*sc_link->device->done) (xs);
if (retval == -1) {
free_xs(xs, sc_link, SCSI_NOSLEEP); /*XXX */
return; /* it did it all, finish up */
}
if (retval == -2)
return; /* it did it all, finish up */
SC_DEBUG(sc_link, SDEV_DB3, ("continuing with generic done()\n"));
}
if ((bp = xs->bp) == NULL) {
/*
* if it's a normal upper level request, then ask
* the upper level code to handle error checking
* rather than doing it here at interrupt time
*/
wakeup(xs);
return;
}
/*
* Go and handle errors now.
* If it returns -1 then we should RETRY
*/
if ((retval = sc_err1(xs)) == -1) {
if ((*(sc_link->adapter->scsi_cmd)) (xs)
== SUCCESSFULLY_QUEUED) /* don't wake the job, ok? */
return;
xs->flags |= ITSDONE;
}
free_xs(xs, sc_link, SCSI_NOSLEEP); /* does a start if needed */
biodone(bp);
}
/*
* ask the scsi driver to perform a command for us.
* tell it where to read/write the data, and how
* long the data is supposed to be. If we have a buf
* to associate with the transfer, we need that too.
*/
int
scsi_scsi_cmd(sc_link, scsi_cmd, cmdlen, data_addr, datalen,
retries, timeout, bp, flags)
struct scsi_link *sc_link;
struct scsi_generic *scsi_cmd;
u_int32 cmdlen;
u_char *data_addr;
u_int32 datalen;
u_int32 retries;
u_int32 timeout;
struct buf *bp;
u_int32 flags;
{
struct scsi_xfer *xs;
int retval;
u_int32 s;
if (bp)
flags |= SCSI_NOSLEEP;
SC_DEBUG(sc_link, SDEV_DB2, ("scsi_cmd\n"));
xs = get_xs(sc_link, flags); /* should wait unless booting */
if (!xs)
return (ENOMEM);
/*
* Fill out the scsi_xfer structure. We don't know whose context
* the cmd is in, so copy it.
*/
bcopy(scsi_cmd, &(xs->cmdstore), cmdlen);
xs->flags = INUSE | flags;
xs->sc_link = sc_link;
xs->retries = retries;
xs->timeout = timeout;
xs->cmd = &xs->cmdstore;
xs->cmdlen = cmdlen;
xs->data = data_addr;
xs->datalen = datalen;
xs->resid = datalen;
xs->bp = bp;
/*XXX*/ /*use constant not magic number */
if (datalen && ((caddr_t) data_addr < (caddr_t) KERNBASE)) {
if (bp) {
printf("Data buffered space not in kernel context\n");
#ifdef SCSIDEBUG
show_scsi_cmd(xs);
#endif /* SCSIDEBUG */
retval = EFAULT;
goto bad;
}
xs->data = malloc(datalen, M_TEMP, M_WAITOK);
/* I think waiting is ok *//*XXX */
switch (flags & (SCSI_DATA_IN | SCSI_DATA_OUT)) {
case 0:
printf("No direction flags, assuming both\n");
#ifdef SCSIDEBUG
show_scsi_cmd(xs);
#endif /* SCSIDEBUG */
case SCSI_DATA_IN | SCSI_DATA_OUT: /* weird */
case SCSI_DATA_OUT:
bcopy(data_addr, xs->data, datalen);
break;
case SCSI_DATA_IN:
bzero(xs->data, datalen);
}
}
retry:
xs->error = XS_NOERROR;
#ifdef DIAGNOSTIC
if (datalen && ((caddr_t) xs->data < (caddr_t) KERNBASE))
printf("It's still wrong!\n");
#endif /* DIAGNOSTIC */
#ifdef SCSIDEBUG
if (sc_link->flags & SDEV_DB3)
show_scsi_xs(xs);
#endif /* SCSIDEBUG */
/*
* Do the transfer. If we are polling we will return:
* COMPLETE, Was poll, and scsi_done has been called
* TRY_AGAIN_LATER, Adapter short resources, try again
*
* if under full steam (interrupts) it will return:
* SUCCESSFULLY_QUEUED, will do a wakeup when complete
* TRY_AGAIN_LATER, (as for polling)
* After the wakeup, we must still check if it succeeded
*
* If we have a bp however, all the error proccessing
* and the buffer code both expect us to return straight
* to them, so as soon as the command is queued, return
*/
retval = (*(sc_link->adapter->scsi_cmd)) (xs);
switch (retval) {
case SUCCESSFULLY_QUEUED:
if (bp)
return retval; /* will sleep (or not) elsewhere */
s = splbio();
while (!(xs->flags & ITSDONE))
tsleep(xs, PRIBIO + 1, "scsi_scsi_cmd", 0);
splx(s);
/* fall through to check success of completed command */
case COMPLETE: /* Polling command completed ok */
/*XXX*/ case HAD_ERROR: /* Polling command completed with error */
SC_DEBUG(sc_link, SDEV_DB3, ("back in cmd()\n"));
if ((retval = sc_err1(xs)) == -1)
goto retry;
break;
case TRY_AGAIN_LATER: /* adapter resource shortage */
SC_DEBUG(sc_link, SDEV_DB3, ("will try again \n"));
/* should sleep 1 sec here */
if (xs->retries--) {
xs->flags &= ~ITSDONE;
goto retry;
}
default:
retval = EIO;
}
/*
* If we had to copy the data out of the user's context,
* then do the other half (copy it back or whatever)
* and free the memory buffer
*/
if (datalen && (xs->data != data_addr)) {
switch (flags & (SCSI_DATA_IN | SCSI_DATA_OUT)) {
case 0:
case SCSI_DATA_IN | SCSI_DATA_OUT: /* weird */
case SCSI_DATA_IN:
bcopy(xs->data, data_addr, datalen);
break;
}
free(xs->data, M_TEMP);
}
/*
* we have finished with the xfer stuct, free it and
* check if anyone else needs to be started up.
*/
bad:
free_xs(xs, sc_link, flags); /* includes the 'start' op */
if (bp && retval) {
bp->b_error = retval;
bp->b_flags |= B_ERROR;
biodone(bp);
}
return (retval);
}
int
sc_err1(xs)
struct scsi_xfer *xs;
{
struct buf *bp = xs->bp;
int retval;
SC_DEBUG(xs->sc_link, SDEV_DB3, ("sc_err1,err = 0x%x \n", xs->error));
/*
* If it has a buf, we might be working with
* a request from the buffer cache or some other
* piece of code that requires us to process
* errors at inetrrupt time. We have probably
* been called by scsi_done()
*/
switch (xs->error) {
case XS_NOERROR: /* nearly always hit this one */
retval = 0;
if (bp) {
bp->b_error = 0;
bp->b_resid = 0;
}
break;
case XS_SENSE:
if (bp) {
bp->b_error = 0;
bp->b_resid = 0;
if (retval = (scsi_interpret_sense(xs))) {
bp->b_flags |= B_ERROR;
bp->b_error = retval;
bp->b_resid = bp->b_bcount;
}
SC_DEBUG(xs->sc_link, SDEV_DB3,
("scsi_interpret_sense (bp) returned %d\n", retval));
} else {
retval = (scsi_interpret_sense(xs));
SC_DEBUG(xs->sc_link, SDEV_DB3,
("scsi_interpret_sense (no bp) returned %d\n", retval));
}
break;
case XS_BUSY:
/*should somehow arange for a 1 sec delay here (how?) */
case XS_TIMEOUT:
/*
* If we can, resubmit it to the adapter.
*/
if (xs->retries--) {
xs->error = XS_NOERROR;
xs->flags &= ~ITSDONE;
goto retry;
}
/* fall through */
case XS_DRIVER_STUFFUP:
if (bp) {
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
}
retval = EIO;
break;
default:
retval = EIO;
sc_print_addr(xs->sc_link);
printf("unknown error category from scsi driver\n");
}
return retval;
retry:
return (-1);
}
/*
* Look at the returned sense and act on the error, determining
* the unix error number to pass back. (0 = report no error)
*
* THIS IS THE DEFAULT ERROR HANDLER
*/
int
scsi_interpret_sense(xs)
struct scsi_xfer *xs;
{
struct scsi_sense_data *sense;
struct scsi_link *sc_link = xs->sc_link;
u_int32 key;
u_int32 silent;
u_int32 info;
int error;
static char *error_mes[] =
{"soft error (corrected)",
"not ready", "medium error",
"non-media hardware failure", "illegal request",
"unit attention", "readonly device",
"no data found", "vendor unique",
"copy aborted", "command aborted",
"search returned equal", "volume overflow",
"verify miscompare", "unknown error key"
};
/*
* If the flags say errs are ok, then always return ok.
*/
if (xs->flags & SCSI_ERR_OK)
return (0);
sense = &(xs->sense);
#ifdef SCSIDEBUG
if (sc_link->flags & SDEV_DB1) {
u_int32 count = 0;
printf("code%x valid%x ",
sense->error_code & SSD_ERRCODE,
sense->error_code & SSD_ERRCODE_VALID ? 1 : 0);
printf("seg%x key%x ili%x eom%x fmark%x\n",
sense->ext.extended.segment,
sense->ext.extended.flags & SSD_KEY,
sense->ext.extended.flags & SSD_ILI ? 1 : 0,
sense->ext.extended.flags & SSD_EOM ? 1 : 0,
sense->ext.extended.flags & SSD_FILEMARK ? 1 : 0);
printf("info: %x %x %x %x followed by %d extra bytes\n",
sense->ext.extended.info[0],
sense->ext.extended.info[1],
sense->ext.extended.info[2],
sense->ext.extended.info[3],
sense->ext.extended.extra_len);
printf("extra: ");
while (count < sense->ext.extended.extra_len)
printf("%x ", sense->ext.extended.extra_bytes[count++]);
printf("\n");
}
#endif /*SCSIDEBUG */
/*
* If the device has it's own error handler, call it first.
* If it returns a legit error value, return that, otherwise
* it wants us to continue with normal error processing.
*/
if (sc_link->device->err_handler) {
SC_DEBUG(sc_link, SDEV_DB2, ("calling private err_handler()\n"));
error = (*sc_link->device->err_handler) (xs);
if (error != -1)
return error; /* error >= 0 better ? */
}
/* otherwise use the default */
silent = (xs->flags & SCSI_SILENT);
switch (sense->error_code & SSD_ERRCODE) {
/*
* If it's code 70, use the extended stuff and interpret the key
*/
case 0x71: /* delayed error */
sc_print_addr(sc_link);
key = sense->ext.extended.flags & SSD_KEY;
printf(" DELAYED ERROR, key = 0x%x\n", key);
case 0x70:
if (sense->error_code & SSD_ERRCODE_VALID)
info = ntohl(*((long *) sense->ext.extended.info));
else
info = 0;
key = sense->ext.extended.flags & SSD_KEY;
if (key && !silent) {
sc_print_addr(sc_link);
printf("%s", error_mes[key - 1]);
if (sense->error_code & SSD_ERRCODE_VALID) {
switch (key) {
case 0x2: /* NOT READY */
case 0x5: /* ILLEGAL REQUEST */
case 0x6: /* UNIT ATTENTION */
case 0x7: /* DATA PROTECT */
break;
case 0x8: /* BLANK CHECK */
printf(", requested size: %d (decimal)",
info);
break;
default:
printf(", info = %d (decimal)", info);
}
}
printf("\n");
}
switch (key) {
case 0x0: /* NO SENSE */
case 0x1: /* RECOVERED ERROR */
if (xs->resid == xs->datalen)
xs->resid = 0; /* not short read */
case 0xc: /* EQUAL */
return (0);
case 0x2: /* NOT READY */
sc_link->flags &= ~SDEV_MEDIA_LOADED;
return (EBUSY);
case 0x5: /* ILLEGAL REQUEST */
return (EINVAL);
case 0x6: /* UNIT ATTENTION */
sc_link->flags &= ~SDEV_MEDIA_LOADED;
if (sc_link->flags & SDEV_OPEN)
return (EIO);
else
return 0;
case 0x7: /* DATA PROTECT */
return (EACCES);
case 0xd: /* VOLUME OVERFLOW */
return (ENOSPC);
case 0x8: /* BLANK CHECK */
return (0);
default:
return (EIO);
}
/*
* Not code 70, just report it
*/
default:
if (!silent) {
sc_print_addr(sc_link);
printf("error code %d",
sense->error_code & SSD_ERRCODE);
if (sense->error_code & SSD_ERRCODE_VALID) {
printf(" at block no. %d (decimal)",
(sense->ext.unextended.blockhi << 16) +
(sense->ext.unextended.blockmed << 8) +
(sense->ext.unextended.blocklow));
}
printf("\n");
}
return (EIO);
}
}
/*
* Utility routines often used in SCSI stuff
*/
/*
* convert a physical address to 3 bytes,
* MSB at the lowest address,
* LSB at the highest.
*/
void
lto3b(val, bytes)
int val;
u_char *bytes;
{
*bytes++ = (val & 0xff0000) >> 16;
*bytes++ = (val & 0xff00) >> 8;
*bytes = val & 0xff;
}
/*
* The reverse of lto3b
*/
int
_3btol(bytes)
u_char *bytes;
{
u_int32 rc;
rc = (*bytes++ << 16);
rc += (*bytes++ << 8);
rc += *bytes;
return ((int) rc);
}
/*
* Print out the scsi_link structure's address info.
*/
void
sc_print_addr(sc_link)
struct scsi_link *sc_link;
{
printf("%s%d(%s:%d:%d): ",
sc_link->device->name, sc_link->dev_unit,
((struct device *)sc_link->adapter_softc)->dv_xname,
sc_link->target, sc_link->lun);
}
#ifdef SCSIDEBUG
/*
* Given a scsi_xfer, dump the request, in all it's glory
*/
void
show_scsi_xs(xs)
struct scsi_xfer *xs;
{
printf("xs(0x%x): ", xs);
printf("flg(0x%x)", xs->flags);
printf("sc_link(0x%x)", xs->sc_link);
printf("retr(0x%x)", xs->retries);
printf("timo(0x%x)", xs->timeout);
printf("cmd(0x%x)", xs->cmd);
printf("len(0x%x)", xs->cmdlen);
printf("data(0x%x)", xs->data);
printf("len(0x%x)", xs->datalen);
printf("res(0x%x)", xs->resid);
printf("err(0x%x)", xs->error);
printf("bp(0x%x)", xs->bp);
show_scsi_cmd(xs);
}
void
show_scsi_cmd(struct scsi_xfer *xs)
{
u_char *b = (u_char *) xs->cmd;
int i = 0;
sc_print_addr(xs->sc_link);
printf("command: ");
if (!(xs->flags & SCSI_RESET)) {
while (i < xs->cmdlen) {
if (i)
printf(",");
printf("%x", b[i++]);
}
printf("-[%d bytes]\n", xs->datalen);
if (xs->datalen)
show_mem(xs->data, min(64, xs->datalen));
} else
printf("-RESET-\n");
}
void
show_mem(address, num)
unsigned char *address;
u_int32 num;
{
u_int32 x, y;
printf("------------------------------");
for (y = 0; y < num; y += 1) {
if (!(y % 16))
printf("\n%03d: ", y);
printf("%02x ", *address++);
}
printf("\n------------------------------\n");
}
#endif /*SCSIDEBUG */
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