static void segdev_callback(struct segdev *dev, xport portno)
{
struct xseg *xseg;
struct segpriv *priv = dev->priv;
struct xseg_private *xpriv;
struct xseg_port *port;
struct segdev_signal_desc *ssd;
xseg = xsegments[portno];
if (!xseg)
return;
if (priv->segno >= nr_xsegments)
return;
xpriv = xseg->priv;
port = xseg_get_port(xseg, portno);
if (!port)
return;
ssd = xseg_get_signal_desc(xseg, port);
if (!ssd || !ssd->waitcue){
return;
}
if (xpriv->wakeup) {
xpriv->wakeup(portno);
}
return;
}
static struct posixfd_signal_desc * __get_signal_desc(struct xseg *xseg, xport portno)
{
struct xseg_port *port = xseg_get_port(xseg, portno);
if (!port)
return NULL;
struct posixfd_signal_desc *psd = xseg_get_signal_desc(xseg, port);
if (!psd)
return NULL;
return psd;
}
static int posix_cancel_wait(struct xseg *xseg, uint32_t portno)
{
struct xseg_port *port = xseg_get_port(xseg, portno);
if (!port)
return -1;
struct posix_signal_desc *psd = xseg_get_signal_desc(xseg, port);
if (!psd)
return -1;
psd->waitcue = 0;
return 0;
}
static int segdev_cancel_wait(struct xseg *xseg, uint32_t portno)
{
struct segdev_signal_desc *ssd;
struct xseg_port *port = xseg_get_port(xseg, portno);
if (!port)
return -1;
ssd = xseg_get_signal_desc(xseg, port);
if (!ssd)
return -1;
/* true/false value */
ssd->waitcue = 0;
return -0;
}
static int posix_signal(struct xseg *xseg, uint32_t portno)
{
struct xseg_port *port = xseg_get_port(xseg, portno);
if (!port)
return -1;
struct posix_signal_desc *psd = xseg_get_signal_desc(xseg, port);
if (!psd)
return -1;
pid_t cue = (pid_t)psd->waitcue;
if (!cue)
//HACKY!
return -2;
/* FIXME: Make calls to xseg_signal() check for errors */
return syscall(SYS_tkill, cue, SIGIO);
}
static int wait_reply(struct xseg *xseg, xport srcport, struct xseg_port *port,
struct xseg_request *expected_req)
{
struct xseg_request *req;
xseg_prepare_wait(xseg, srcport);
void *psd = xseg_get_signal_desc(xseg, port);
while (1) {
req = xseg_receive(xseg, srcport, X_NONBLOCK);
if (req) {
if (req != expected_req) {
archipelagolog("Unknown received request\n");
xseg_put_request(xseg, req, srcport);
} else if (!(req->state & XS_SERVED)) {
return -1;
} else {
break;
}
}
xseg_wait_signal(xseg, psd, 100000UL);
}
xseg_cancel_wait(xseg, srcport);
return 0;
}
static void xseg_request_handler(void *state)
{
BDRVArchipelagoState *s = (BDRVArchipelagoState *) state;
void *psd = xseg_get_signal_desc(s->xseg, s->port);
qemu_mutex_lock(&s->request_mutex);
while (!s->stopping) {
struct xseg_request *req;
void *data;
xseg_prepare_wait(s->xseg, s->srcport);
req = xseg_receive(s->xseg, s->srcport, X_NONBLOCK);
if (req) {
AIORequestData *reqdata;
ArchipelagoSegmentedRequest *segreq;
xseg_get_req_data(s->xseg, req, (void **)&reqdata);
switch (reqdata->op) {
case ARCHIP_OP_READ:
data = xseg_get_data(s->xseg, req);
segreq = reqdata->segreq;
segreq->count += req->serviced;
qemu_iovec_from_buf(reqdata->aio_cb->qiov, reqdata->bufidx,
data,
req->serviced);
xseg_put_request(s->xseg, req, s->srcport);
if ((__sync_add_and_fetch(&segreq->ref, -1)) == 0) {
if (!segreq->failed) {
reqdata->aio_cb->ret = segreq->count;
archipelago_finish_aiocb(reqdata);
g_free(segreq);
} else {
g_free(segreq);
g_free(reqdata);
}
} else {
g_free(reqdata);
}
break;
case ARCHIP_OP_WRITE:
case ARCHIP_OP_FLUSH:
segreq = reqdata->segreq;
segreq->count += req->serviced;
xseg_put_request(s->xseg, req, s->srcport);
if ((__sync_add_and_fetch(&segreq->ref, -1)) == 0) {
if (!segreq->failed) {
reqdata->aio_cb->ret = segreq->count;
archipelago_finish_aiocb(reqdata);
g_free(segreq);
} else {
g_free(segreq);
g_free(reqdata);
}
} else {
g_free(reqdata);
}
break;
case ARCHIP_OP_VOLINFO:
s->is_signaled = true;
qemu_cond_signal(&s->archip_cond);
break;
}
} else {
xseg_wait_signal(s->xseg, psd, 100000UL);
}
xseg_cancel_wait(s->xseg, s->srcport);
}
s->th_is_signaled = true;
qemu_cond_signal(&s->request_cond);
qemu_mutex_unlock(&s->request_mutex);
qemu_thread_exit(NULL);
}