ref: d1540c7f666e3c5d636b48c956b444205b50502d
dir: /os/boot/pc/sdaoe.c/
/*
* aoe sd bootstrap driver, copyright © 2007 coraid
*/
#include "u.h"
#include "mem.h"
#include "lib.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "sd.h"
#include "aoe.h"
enum {
Nctlr = 4,
};
enum {
/* sync with ahci.h */
Dllba = 1<<0,
Dsmart = 1<<1,
Dpower = 1<<2,
Dnop = 1<<3,
Datapi = 1<<4,
Datapi16= 1<<5,
};
enum {
Tfree = -1,
Tmgmt,
};
typedef struct Ctlr Ctlr;
struct Ctlr{
Ctlr *next;
SDunit *unit;
int ctlrno;
int major;
int minor;
uchar ea[Eaddrlen];
ushort lasttag;
ulong vers;
uchar mediachange;
uchar flag;
uchar smart;
uchar smartrs;
uchar feat;
uvlong sectors;
char serial[20+1];
char firmware[8+1];
char model[40+1];
char ident[0x100];
};
static Ctlr *head;
static Ctlr *tail;
static int aoeether[10];
SDifc sdaoeifc;
static void
hnputs(uchar *p, ushort i)
{
p[0] = i >> 8;
p[1] = i;
}
static void
hnputl(uchar *p, ulong i)
{
p[0] = i >> 24;
p[1] = i >> 16;
p[2] = i >> 8;
p[3] = i;
}
static ushort
nhgets(uchar *p)
{
return *p<<8 | p[1];
}
static ulong
nhgetl(uchar *p)
{
return p[0]<<24 | p[1]<<16 | p[2]<<8 | p[3];
}
static int
newtag(Ctlr *d)
{
int t;
for(;;){
t = ++d->lasttag << 16;
t |= m->ticks & 0xffff;
switch(t) {
case Tfree:
case Tmgmt:
break;
default:
return t;
}
}
}
static int
hset(Ctlr *d, Aoehdr *h, int cmd)
{
int tag;
memmove(h->dst, d->ea, Eaddrlen);
hnputs(h->type, Aoetype);
h->verflag = Aoever << 4;
hnputs(h->major, d->major);
h->minor = d->minor;
h->cmd = cmd;
hnputl(h->tag, tag = newtag(d));
return tag;
}
static void
idmove(char *p, ushort *a, int n)
{
int i;
char *op, *e;
op = p;
for(i = 0; i < n / 2; i++){
*p++ = a[i] >> 8;
*p++ = a[i];
}
*p = 0;
while(p > op && *--p == ' ')
*p = 0;
e = p;
p = op;
while(*p == ' ')
p++;
memmove(op, p, n - (e - p));
}
static ushort
gbit16(void *a)
{
uchar *i;
i = a;
return i[1]<<8 | i[0];
}
static ulong
gbit32(void *a)
{
uchar *i;
ulong j;
i = a;
j = i[3] << 24;
j |= i[2] << 16;
j |= i[1] << 8;
j |= i[0];
return j;
}
static uvlong
gbit64(void *a)
{
uchar *i;
i = a;
return (uvlong)gbit32(i+4) << 32 | gbit32(a);
}
static int
ataidentify(Ctlr *c, ushort *id)
{
vlong s;
int i;
i = gbit16(id+83) | gbit16(id+86);
if(i & (1 << 10)){
c->feat |= Dllba;
s = gbit64(id+100);
}else
s = gbit32(id+60);
idmove(c->serial, id+10, 20);
idmove(c->firmware, id+23, 8);
idmove(c->model, id+27, 40);
print("aoe discovers %d.%d: %s %s\n", c->major, c->minor, c->model, c->serial);
c->sectors = s;
c->mediachange = 1;
return 0;
}
static void
identifydump(Aoeata *a)
{
print("%E %E type=%.4ux verflag=%x error=%x %d.%d cmd=%d tag=%.8lux\n",
a->dst, a->src, nhgets(a->type), a->verflag, a->error,
nhgets(a->major), a->minor, a->cmd, nhgetl(a->tag));
print(" aflag=%x errfeat=%ux scnt=%d cmdstat=%ux, lba=%d? res=%.4ux\n",
a->aflag, a->errfeat, a->scnt, a->cmdstat, 0, nhgets(a->res));
}
static int
idpkt(Ctlr *c, Aoeata *a)
{
memset(a, 0, sizeof *a);
a->cmdstat = Cid;
a->scnt = 1;
a->lba[3] = 0xa0;
return hset(c, a, ACata);
}
static int
chktag(int *out, int nout, int tag)
{
int j;
for(j = 0; j <= nout; j++)
if(out[j] == tag)
return 0;
print("wrong tag\n");
for(j = 0; j <= nout; j++)
print("%.8ux != %.8ux\n", out[j], tag);
return -1;
}
/*
* ignore the tag for identify. better than ignoring
* a response to the wrong identify request
*/
static int
identify(Ctlr *c)
{
int tag[5], i, n;
Aoeata *a;
Etherpkt p;
memset(&p, 0, sizeof p);
a = (Aoeata*)&p;
i = 0;
do {
if(i == 5){
print("aoe: identify timeout\n");
return -1;
}
tag[i] = idpkt(c, a);
ethertxpkt(c->ctlrno, &p, sizeof *a, 0);
memset(&p, 0, sizeof p);
next:
n = etherrxpkt(c->ctlrno, &p, 125);
if(n == 0){
i++;
continue;
}
if(nhgets(a->type) != Aoetype)
goto next;
if(nhgets(a->major) != c->major || a->minor != c->minor){
print("wrong device %d.%d want %d.%d; %d\n",
nhgets(a->major), a->minor,
c->major, c->minor, n);
goto next;
}
if(chktag(tag, i, nhgetl(a->tag)) == -1)
goto next;
if(a->cmdstat & 0xa9){
print("aoe: ata error on identify: %2ux\n", a->cmdstat);
return -1;
}
} while (a->scnt != 1);
c->feat = 0;
ataidentify(c, (ushort*)(a+1));
return 0;
}
static Ctlr*
ctlrlookup(int major, int minor)
{
Ctlr *c;
for(c = head; c; c = c->next)
if(c->major == major && c->minor == minor)
break;
return c;
}
static Ctlr*
newctlr(Etherpkt *p)
{
int major, minor;
Aoeqc *q;
Ctlr *c;
q = (Aoeqc*)p;
if(nhgets(q->type) != Aoetype)
return 0;
major = nhgets(q->major);
minor = q->minor;
if(major == 0xffff || minor == 0xff)
return 0;
if(ctlrlookup(major, minor)){
print("duplicate shelf.slot\n");
return 0;
}
if((c = malloc(sizeof *c)) == 0)
return 0;
c->major = major;
c->minor = minor;
memmove(c->ea, q->src, Eaddrlen);
if(head != 0)
tail->next = c;
else
head = c;
tail = c;
return c;
}
static void
discover(int major, int minor)
{
int i;
Aoehdr *h;
Etherpkt p;
for(i = 0; i < nelem(aoeether); i++){
if(aoeether[i] == 0)
continue;
memset(&p, 0, ETHERMINTU);
h = (Aoehdr*)&p;
memset(h->dst, 0xff, sizeof h->dst);
hnputs(h->type, Aoetype);
h->verflag = Aoever << 4;
hnputs(h->major, major);
h->minor = minor;
h->cmd = ACconfig;
ethertxpkt(i, &p, ETHERMINTU, 0);
}
}
static int
rxany(Etherpkt *p, int t)
{
int i, n;
for(i = 0; i < nelem(aoeether); i++){
if(aoeether[i] == 0)
continue;
while ((n = etherrxpkt(i, p, t)) != 0)
if(nhgets(p->type) == Aoetype)
return n;
}
return 0;
}
static int
aoeprobe(int major, int minor, SDev *s)
{
Ctlr *ctlr;
Etherpkt p;
int n, i;
for(i = 0;; i += 200){
if(i > 8000)
return -1;
discover(major, minor);
again:
n = rxany(&p, 100);
if(n > 0 && (ctlr = newctlr(&p)))
break;
if(n > 0)
goto again;
}
s->ctlr = ctlr;
s->ifc = &sdaoeifc;
s->nunit = 1;
return 0;
}
static char *probef[32];
static int nprobe;
int
pnpprobeid(char *s)
{
int id;
if(strlen(s) < 2)
return 0;
id = 'e';
if(s[1] == '!')
id = s[0];
return id;
}
int
tokenize(char *s, char **args, int maxargs)
{
int nargs;
for(nargs = 0; nargs < maxargs; nargs++){
while(*s != '\0' && strchr("\t\n ", *s) != nil)
s++;
if(*s == '\0')
break;
args[nargs] = s;
while(*s != '\0' && strchr("\t\n ", *s) == nil)
s++;
if(*s != '\0')
*s++ = 0;
}
return nargs;
}
int
aoepnp0(void)
{
int i;
char *p, c;
if((p = getconf("aoeif")) == nil)
return 0;
print("aoeif = %s\n", p);
nprobe = tokenize(p, probef, nelem(probef));
for(i = 0; i < nprobe; i++){
if(strncmp(probef[i], "ether", 5) != 0)
continue;
c = probef[i][5];
if(c > '9' || c < '0')
continue;
aoeether[c - '0'] = 1;
}
if((p = getconf("aoedev")) == nil)
return 0;
return nprobe = tokenize(p, probef, nelem(probef));
}
int
probeshelf(char *s, int *shelf, int *slot)
{
int a, b;
char *r;
for(r = s + strlen(s) - 1; r > s; r--)
if((*r < '0' || *r > '9') && *r != '.'){
r++;
break;
}
a = strtoul(r, &r, 10);
if(*r++ != '.')
return -1;
b = strtoul(r, 0, 10);
*shelf = a;
*slot = b;
print(" shelf=%d.%d\n", a, b);
return 0;
}
Ctlr*
pnpprobe(SDev *sd)
{
int shelf, slot;
char *p;
static int i;
if(i >= nprobe)
return 0;
p = probef[i++];
if(strlen(p) < 2)
return 0;
if(p[1] == '!'){
sd->idno = p[0];
p += 2;
}
if(probeshelf(p, &shelf, &slot) == -1 ||
aoeprobe(shelf, slot, sd) == -1 ||
identify(sd->ctlr) == -1)
return 0;
return sd->ctlr;
}
/*
* we may need to pretend we found something
*/
SDev*
aoepnp(void)
{
int n, i, id;
char *p;
SDev *h, *t, *s;
p = getconf("aoeif");
if (p)
print("aoepnp: aoeif=%s\n", p);
if((n = aoepnp0()) == 0)
n = 2;
t = h = 0;
for(i = 0; i < n; i++){
id = 'e';
s = malloc(sizeof *s);
if(s == 0)
break;
s->ctlr = 0;
s->idno = id;
s->ifc = &sdaoeifc;
s->nunit = 1;
pnpprobe(s);
if(h)
t->next = s;
else
h = s;
t = s;
}
return h;
}
static int
aoeverify(SDunit *u)
{
Ctlr *c;
SDev *s;
s = u->dev;
c = s->ctlr;
if(c == 0){
aoepnp0();
if((s->ctlr = c = pnpprobe(s)) == nil)
return 0;
}
c->mediachange = 1;
return 1;
}
static int
aoeonline(SDunit *u)
{
int r;
Ctlr *c;
c = u->dev->ctlr;
if(c->mediachange){
r = 2;
c->mediachange = 0;
u->sectors = c->sectors;
u->secsize = 512;
} else
r = 1;
return r;
}
static int
rio(Ctlr *c, Aoeata *a, int n, int scnt)
{
int i, tag, cmd;
for(i = 0; i < 5; i++){
tag = hset(c, a, ACata);
cmd = a->cmdstat;
ethertxpkt(c->ctlrno, (Etherpkt*)a, n, 0);
memset(a, 0, sizeof *a);
again:
n = etherrxpkt(c->ctlrno, (Etherpkt*)a, 125);
if(n == 0)
continue;
if(nhgets(a->type) != Aoetype || nhgetl(a->tag) != tag ||
nhgets(a->major) != c->major || a->minor != c->minor)
goto again;
if(a->cmdstat & 0xa9){
print("aoe: ata rio error: %2ux\n", a->cmdstat);
return 0;
}
switch(cmd){
case Crd:
case Crdext:
if(n - sizeof *a < scnt * 512){
print("aoe: runt expect %d got %d\n",
scnt*512 + sizeof *a, n);
return 0;
}
return n - sizeof *a;
case Cwr:
case Cwrext:
return scnt * 512;
default:
print("unknown cmd %ux\n", cmd);
break;
}
}
print("aoe: rio timeout\n");
return 0;
}
static void
putlba(Aoeata *a, vlong lba)
{
uchar *c;
c = a->lba;
c[0] = lba;
c[1] = lba >> 8;
c[2] = lba >> 16;
c[3] = lba >> 24;
c[4] = lba >> 32;
c[5] = lba >> 40;
}
/*
* you'll need to loop if you want to read more than 2 sectors. for now
* i'm cheeting and not bothering with a loop.
*/
static uchar pktbuf[1024 + sizeof(Aoeata)];
static int
aoebuild(Ctlr *c, uchar *cmd, char *data, vlong lba, int scnt)
{
int n;
Aoeata *a;
memset(pktbuf, 0, sizeof pktbuf);
a = (Aoeata*)pktbuf;
hset(c, a, ACata);
putlba(a, lba);
a->cmdstat = 0x20;
if(c->flag & Dllba){
a->aflag |= AAFext;
a->cmdstat |= 4;
}else{
a->lba[3] &= 0xf;
a->lba[3] |= 0xe0; /* LBA bit+obsolete 0xa0 */
}
n = scnt;
if(n > 2)
n = 2;
a->scnt = n;
switch(*cmd){
case 0x2a:
a->aflag |= AAFwrite;
a->cmdstat |= 10;
memmove(a+1, data, n*512);
n = sizeof *a + n*512;
break;
case 0x28:
n = sizeof *a;
break;
default:
print("aoe: bad cmd 0x%.2ux\n", cmd[0]);
return -1;
}
return n;
}
static int
aoerio(SDreq *r)
{
int size, nsec, n;
vlong lba;
char *data;
uchar *cmd;
Aoeata *a;
Ctlr *c;
SDunit *unit;
unit = r->unit;
c = unit->dev->ctlr;
if(r->data == nil)
return SDok;
cmd = r->cmd;
lba = cmd[2]<<24 | cmd[3]<<16 | cmd[4]<<8 | cmd[5]; /* sic. */
nsec = cmd[7]<<8 | cmd[8];
a = (Aoeata*)pktbuf;
data = r->data;
r->rlen = 0;
for(; nsec > 0; nsec -= n){
// print("aoebuild(%2x, %p, %lld, %d)\n", *cmd, data, lba, nsec);
size = aoebuild(c, cmd, data, lba, nsec);
if(size < 0){
r->status = SDcheck;
return SDcheck;
}
n = a->scnt;
r->rlen += rio(c, a, size, n);
if(*cmd == 0x28)
memmove(r->data, a + 1, n * 512);
data += n * 512;
lba += n;
}
r->status = SDok;
return SDok;
}
SDifc sdaoeifc = {
"aoe",
aoepnp,
nil, /* legacy */
nil, /* id */
nil, /* enable */
nil, /* disable */
aoeverify,
aoeonline,
aoerio,
nil,
nil,
scsibio,
};