void shutdown_fbfront(struct fbfront_dev *dev)
{
char* err;
char *nodename = dev->nodename;
char path[strlen(dev->backend) + 1 + 5 + 1];
printk("close fb: backend at %s\n",dev->backend);
snprintf(path, sizeof(path), "%s/state", dev->backend);
err = xenbus_printf(XBT_NIL, nodename, "state", "%u", 5); /* closing */
xenbus_wait_for_value(path, "5", &dev->events);
err = xenbus_printf(XBT_NIL, nodename, "state", "%u", 6);
xenbus_wait_for_value(path, "6", &dev->events);
err = xenbus_printf(XBT_NIL, nodename, "state", "%u", 1);
// does not work yet
//xenbus_wait_for_value(path, "2", &dev->events);
xenbus_unwatch_path(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/page-ref", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/event-channel", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/protocol", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/feature-update", nodename);
xenbus_rm(XBT_NIL, path);
unbind_evtchn(dev->evtchn);
free_fbfront(dev);
}
void shutdown_fbfront(struct fbfront_dev *dev)
{
char* err = NULL;
XenbusState state;
char path[strlen(dev->backend) + 1 + 5 + 1];
char nodename[strlen(dev->nodename) + 1 + 5 + 1];
printk("close fb: backend at %s\n",dev->backend);
snprintf(path, sizeof(path), "%s/state", dev->backend);
snprintf(nodename, sizeof(nodename), "%s/state", dev->nodename);
if ((err = xenbus_switch_state(XBT_NIL, nodename, XenbusStateClosing)) != NULL) {
printk("shutdown_fbfront: error changing state to %d: %s\n",
XenbusStateClosing, err);
goto close_fbfront;
}
state = xenbus_read_integer(path);
while (err == NULL && state < XenbusStateClosing)
err = xenbus_wait_for_state_change(path, &state, &dev->events);
if (err) free(err);
if ((err = xenbus_switch_state(XBT_NIL, nodename, XenbusStateClosed)) != NULL) {
printk("shutdown_fbfront: error changing state to %d: %s\n",
XenbusStateClosed, err);
goto close_fbfront;
}
state = xenbus_read_integer(path);
if (state < XenbusStateClosed) {
xenbus_wait_for_state_change(path, &state, &dev->events);
if (err) free(err);
}
if ((err = xenbus_switch_state(XBT_NIL, nodename, XenbusStateInitialising)) != NULL) {
printk("shutdown_fbfront: error changing state to %d: %s\n",
XenbusStateInitialising, err);
goto close_fbfront;
}
err = NULL;
state = xenbus_read_integer(path);
while (err == NULL && (state < XenbusStateInitWait || state >= XenbusStateClosed))
err = xenbus_wait_for_state_change(path, &state, &dev->events);
close_fbfront:
if (err) free(err);
xenbus_unwatch_path_token(XBT_NIL, path, path);
snprintf(path, sizeof(path), "%s/page-ref", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/event-channel", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/protocol", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/feature-update", nodename);
xenbus_rm(XBT_NIL, path);
if (!err)
free_fbfront(dev);
}
struct fbfront_dev *init_fbfront(char *_nodename, unsigned long *mfns, int width, int height, int depth, int stride, int n)
{
xenbus_transaction_t xbt;
char* err;
char* message=NULL;
struct xenfb_page *s;
int retry=0;
char* msg=NULL;
int i, j;
struct fbfront_dev *dev;
int max_pd;
unsigned long mapped;
char* nodename = _nodename ? _nodename : "device/vfb/0";
char path[strlen(nodename) + 1 + 10 + 1];
printk("******************* FBFRONT for %s **********\n\n\n", nodename);
dev = malloc(sizeof(*dev));
memset(dev, 0, sizeof(*dev));
dev->nodename = strdup(nodename);
#ifdef HAVE_LIBC
dev->fd = -1;
#endif
snprintf(path, sizeof(path), "%s/backend-id", nodename);
dev->dom = xenbus_read_integer(path);
evtchn_alloc_unbound(dev->dom, fbfront_handler, dev, &dev->evtchn);
dev->page = s = (struct xenfb_page*) alloc_page();
memset(s,0,PAGE_SIZE);
s->in_cons = s->in_prod = 0;
s->out_cons = s->out_prod = 0;
dev->width = s->width = width;
dev->height = s->height = height;
dev->depth = s->depth = depth;
dev->stride = s->line_length = stride;
dev->mem_length = s->mem_length = n * PAGE_SIZE;
dev->offset = 0;
dev->events = NULL;
max_pd = sizeof(s->pd) / sizeof(s->pd[0]);
mapped = 0;
for (i = 0; mapped < n && i < max_pd; i++) {
unsigned long *pd = (unsigned long *) alloc_page();
for (j = 0; mapped < n && j < PAGE_SIZE / sizeof(unsigned long); j++)
pd[j] = mfns[mapped++];
for ( ; j < PAGE_SIZE / sizeof(unsigned long); j++)
pd[j] = 0;
s->pd[i] = virt_to_mfn(pd);
}
for ( ; i < max_pd; i++)
s->pd[i] = 0;
again:
err = xenbus_transaction_start(&xbt);
if (err) {
printk("starting transaction\n");
free(err);
}
err = xenbus_printf(xbt, nodename, "page-ref","%lu", virt_to_mfn(s));
if (err) {
message = "writing page-ref";
goto abort_transaction;
}
err = xenbus_printf(xbt, nodename, "event-channel", "%u", dev->evtchn);
if (err) {
message = "writing event-channel";
goto abort_transaction;
}
err = xenbus_printf(xbt, nodename, "protocol", "%s",
XEN_IO_PROTO_ABI_NATIVE);
if (err) {
message = "writing event-channel";
goto abort_transaction;
}
err = xenbus_printf(xbt, nodename, "feature-update", "1");
if (err) {
message = "writing event-channel";
goto abort_transaction;
}
snprintf(path, sizeof(path), "%s/state", nodename);
err = xenbus_switch_state(xbt, path, XenbusStateInitialised);
if (err) {
message = "switching state";
goto abort_transaction;
}
err = xenbus_transaction_end(xbt, 0, &retry);
free(err);
if (retry) {
goto again;
printk("completing transaction\n");
}
goto done;
abort_transaction:
free(err);
err = xenbus_transaction_end(xbt, 1, &retry);
printk("Abort transaction %s\n", message);
goto error;
done:
snprintf(path, sizeof(path), "%s/backend", nodename);
msg = xenbus_read(XBT_NIL, path, &dev->backend);
if (msg) {
printk("Error %s when reading the backend path %s\n", msg, path);
goto error;
}
printk("backend at %s\n", dev->backend);
{
XenbusState state;
char path[strlen(dev->backend) + strlen("/request-update") + 1];
char frontpath[strlen(nodename) + strlen("/state") + 1];
snprintf(path, sizeof(path), "%s/state", dev->backend);
xenbus_watch_path_token(XBT_NIL, path, path, &dev->events);
err = NULL;
state = xenbus_read_integer(path);
while (err == NULL && state < XenbusStateConnected)
err = xenbus_wait_for_state_change(path, &state, &dev->events);
if (state != XenbusStateConnected) {
printk("backend not available, state=%d\n", state);
free(err);
err = xenbus_unwatch_path_token(XBT_NIL, path, path);
goto error;
}
printk("%s connected\n", dev->backend);
snprintf(path, sizeof(path), "%s/request-update", dev->backend);
dev->request_update = xenbus_read_integer(path);
snprintf(frontpath, sizeof(frontpath), "%s/state", nodename);
if ((err = xenbus_switch_state(XBT_NIL, frontpath, XenbusStateConnected))
!= NULL) {
printk("error switching state: %s\n", err);
free(err);
err = xenbus_unwatch_path_token(XBT_NIL, path, path);
goto error;
}
}
unmask_evtchn(dev->evtchn);
printk("************************** FBFRONT\n");
return dev;
error:
free(msg);
free(err);
free_fbfront(dev);
return NULL;
}
