ref: a5db044fd3ccb8f021d4deb07b3dc732ed41d699
dir: /sys/src/9/port/sdscsi.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "ureg.h"
#include "../port/error.h"
#include "../port/sd.h"
static int
scsitest(SDreq* r)
{
r->write = 0;
memset(r->cmd, 0, sizeof(r->cmd));
r->cmd[1] = r->lun<<5;
r->clen = 6;
r->data = nil;
r->dlen = 0;
r->flags = 0;
r->status = ~0;
return r->unit->dev->ifc->rio(r);
}
int
scsiverify(SDunit* unit)
{
SDreq *r;
int i, status;
uchar *inquiry;
if((r = malloc(sizeof(SDreq))) == nil)
return 0;
if((inquiry = sdmalloc(sizeof(unit->inquiry))) == nil){
free(r);
return 0;
}
r->unit = unit;
r->lun = 0; /* ??? */
memset(unit->inquiry, 0, sizeof(unit->inquiry));
r->write = 0;
r->cmd[0] = 0x12;
r->cmd[1] = r->lun<<5;
r->cmd[4] = 36;
r->clen = 6;
r->data = inquiry;
r->dlen = 36;
r->flags = 0;
r->status = ~0;
if(unit->dev->ifc->rio(r) != SDok){
free(r);
return 0;
}
memmove(unit->inquiry, inquiry, r->dlen);
free(inquiry);
SET(status);
for(i = 0; i < 3; i++){
while((status = scsitest(r)) == SDbusy)
;
if(status == SDok || status != SDcheck)
break;
if(!(r->flags & SDvalidsense))
break;
if((r->sense[2] & 0x0F) != 0x02)
continue;
/*
* Unit is 'not ready'.
* If it is in the process of becoming ready or needs
* an initialising command, set status so it will be spun-up
* below.
* If there's no medium, that's OK too, but don't
* try to spin it up.
*/
if(r->sense[12] == 0x04){
if(r->sense[13] == 0x02 || r->sense[13] == 0x01){
status = SDok;
break;
}
}
if(r->sense[12] == 0x3A)
break;
}
if(status == SDok){
/*
* Try to ensure a direct-access device is spinning.
* Don't wait for completion, ignore the result.
*/
if((unit->inquiry[0] & 0x1F) == 0){
memset(r->cmd, 0, sizeof(r->cmd));
r->write = 0;
r->cmd[0] = 0x1B;
r->cmd[1] = (r->lun<<5)|0x01;
r->cmd[4] = 1;
r->clen = 6;
r->data = nil;
r->dlen = 0;
r->flags = 0;
r->status = ~0;
unit->dev->ifc->rio(r);
}
}
free(r);
if(status == SDok || status == SDcheck)
return 1;
return 0;
}
static int
scsirio(SDreq* r)
{
/*
* Perform an I/O request, returning
* -1 failure
* 0 ok
* 1 no medium present
* 2 retry
* The contents of r may be altered so the
* caller should re-initialise if necesary.
*/
r->status = ~0;
switch(r->unit->dev->ifc->rio(r)){
default:
break;
case SDcheck:
if(!(r->flags & SDvalidsense))
break;
switch(r->sense[2] & 0x0F){
case 0x00: /* no sense */
case 0x01: /* recovered error */
return 2;
case 0x06: /* check condition */
/*
* 0x28 - not ready to ready transition,
* medium may have changed.
* 0x29 - power on or some type of reset.
*/
if(r->sense[12] == 0x28 && r->sense[13] == 0)
return 2;
if(r->sense[12] == 0x29)
return 2;
break;
case 0x02: /* not ready */
/*
* If no medium present, bail out.
* If unit is becoming ready, rather than not
* not ready, wait a little then poke it again.
*/
if(r->sense[12] == 0x3A)
break;
if(r->sense[12] != 0x04 || r->sense[13] != 0x01)
break;
while(waserror())
;
tsleep(&up->sleep, return0, 0, 500);
poperror();
scsitest(r);
return 2;
default:
break;
}
break;
case SDok:
return 0;
}
return -1;
}
static void
cap10(SDreq *r)
{
r->cmd[0] = 0x25;
r->cmd[1] = r->lun<<5;
r->clen = 10;
r->dlen = 8;
}
static void
cap16(SDreq *r)
{
uint i;
i = 32;
r->cmd[0] = 0x9e;
r->cmd[1] = 0x10;
r->cmd[10] = i>>24;
r->cmd[11] = i>>16;
r->cmd[12] = i>>8;
r->cmd[13] = i;
r->clen = 16;
r->dlen = i;
}
static uint
belong(uchar *u)
{
return u[0]<<24 | u[1]<<16 | u[2]<<8 | u[3];
}
static uvlong
capreply(SDreq *r, ulong *secsize)
{
uchar *u;
ulong ss;
uvlong s;
u = r->data;
if(r->clen == 16){
s = (uvlong)belong(u)<<32 | belong(u + 4);
ss = belong(u + 8);
}else{
s = belong(u);
ss = belong(u + 4);
}
if(secsize)
*secsize = ss;
return s;
}
int
scsionline(SDunit* unit)
{
SDreq *r;
uchar *p;
ulong ss;
uvlong s;
int ok, retries;
void (*cap)(SDreq*);
if((r = malloc(sizeof *r)) == nil)
return 0;
if((p = sdmalloc(32)) == nil){
free(r);
return 0;
}
ok = 0;
cap = cap10;
r->unit = unit;
r->lun = 0; /* ??? */
for(retries = 0; retries < 10; retries++){
/*
* Read-capacity is mandatory for DA, WORM, CD-ROM and
* MO. It may return 'not ready' if type DA is not
* spun up, type MO or type CD-ROM are not loaded or just
* plain slow getting their act together after a reset.
*/
r->write = 0;
r->data = p;
r->flags = 0;
memset(r->cmd, 0, sizeof r->cmd);
cap(r);
switch(scsirio(r)){
default:
/*
* ATAPI returns error and no sense information
* on media change / no media present.
* count as retries.
*/
if(retries < 4)
continue;
break;
case 0:
s = capreply(r, &ss);
if(s == 0xffffffff && cap == cap10){
cap = cap16;
continue;
}
if(s == 0xffffffffffffffffLL)
s = 0;
/*
* Some ATAPI CD readers lie about the block size.
* Since we don't read audio via this interface
* it's okay to always fudge this.
*/
if(ss == 2352)
ss = 2048;
/*
* Devices with removable media may return 0 sectors
* when they have empty media (e.g. sata dvd writers);
* if so, keep the count zero.
*
* Read-capacity returns the LBA of the last sector,
* therefore the number of sectors must be incremented.
*/
if(s != 0)
s++;
ok = (unit->sectors != s) ? 2 : 1;
unit->sectors = s;
unit->secsize = ss;
break;
case 1:
ok = (unit->sectors != 0) ? 2 : 1;
unit->sectors = 0;
break;
case 2:
continue;
}
break;
}
free(p);
free(r);
/*
print("scsionline: %s: ok=%d retries=%d sectors=%llud secsize=%lud\n",
unit->name, ok, retries, unit->sectors, unit->secsize);
*/
if(ok)
return ok+retries;
else
return 0;
}
static void
scsifmt10(SDreq *r, int write, int lun, ulong nb, uvlong bno)
{
uchar *c;
c = r->cmd;
if(write == 0)
c[0] = 0x28;
else
c[0] = 0x2A;
c[1] = lun<<5;
c[2] = bno>>24;
c[3] = bno>>16;
c[4] = bno>>8;
c[5] = bno;
c[6] = 0;
c[7] = nb>>8;
c[8] = nb;
c[9] = 0;
r->clen = 10;
}
static void
scsifmt16(SDreq *r, int write, int lun, ulong nb, uvlong bno)
{
uchar *c;
c = r->cmd;
if(write == 0)
c[0] = 0x88;
else
c[0] = 0x8A;
c[1] = lun<<5; /* so wrong */
c[2] = bno>>56;
c[3] = bno>>48;
c[4] = bno>>40;
c[5] = bno>>32;
c[6] = bno>>24;
c[7] = bno>>16;
c[8] = bno>>8;
c[9] = bno;
c[10] = nb>>24;
c[11] = nb>>16;
c[12] = nb>>8;
c[13] = nb;
c[14] = 0;
c[15] = 0;
r->clen = 16;
}
long
scsibio(SDunit* unit, int lun, int write, void* data, long nb, uvlong bno)
{
SDreq *r;
long rlen;
r = smalloc(sizeof(SDreq));
r->unit = unit;
r->lun = lun;
again:
r->write = write;
if(bno > 0xffffffff)
scsifmt16(r, write, lun, nb, bno);
else
scsifmt10(r, write, lun, nb, bno);
r->data = data;
r->dlen = nb*unit->secsize;
r->flags = 0;
r->status = ~0;
switch(scsirio(r)){
default:
rlen = -1;
break;
case 0:
/*
* scsi allows commands to return successfully
* but return sense data, indicating that the
* operation didn't proceed as expected.
* (confusing, no). this allows the raw commands
* to successfully return errors. but any sense
* data bio sees must be an error. bomb out.
*/
if(r->status == SDok && r->rlen > 0
&& ((r->flags & SDvalidsense) == 0 || r->sense[2] == 0)){
rlen = r->rlen;
break;
}
case 2:
rlen = -1;
if(!(r->flags & SDvalidsense))
break;
switch(r->sense[2] & 0x0F){
default:
break;
case 0x01: /* recovered error */
print("%s: recovered error at sector %llud\n",
unit->name, bno);
rlen = r->rlen;
break;
case 0x06: /* check condition */
/*
* Check for a removeable media change.
* If so, mark it by zapping the geometry info
* to force an online request.
*/
if(r->sense[12] != 0x28 || r->sense[13] != 0)
break;
if(unit->inquiry[1] & 0x80)
unit->sectors = 0;
break;
case 0x02: /* not ready */
/*
* If unit is becoming ready,
* rather than not not ready, try again.
*/
if(r->sense[12] == 0x04 && r->sense[13] == 0x01)
goto again;
break;
}
snprint(up->genbuf, sizeof up->genbuf, "%s %.2ux%.2ux%.2ux %lld",
Eio, r->sense[2], r->sense[12], r->sense[13], bno);
free(r);
error(up->genbuf);
break;
}
free(r);
return rlen;
}