/*
* hub_set_piomode()
*
* Put the hub into either "PIO conveyor belt" mode or "fire-and-forget"
* mode. To do this, we have to make absolutely sure that no PIOs
* are in progress so we turn off access to all widgets for the duration
* of the function.
*
* XXX - This code should really check what kind of widget we're talking
* to. Bridges can only handle three requests, but XG will do more.
* How many can crossbow handle to widget 0? We're assuming 1.
*
* XXX - There is a bug in the crossbow that link reset PIOs do not
* return write responses. The easiest solution to this problem is to
* leave widget 0 (xbow) in fire-and-forget mode at all times. This
* only affects pio's to xbow registers, which should be rare.
*/
void
hub_set_piomode(nasid_t nasid, int conveyor)
{
hubreg_t ii_iowa;
int direct_connect;
hubii_wcr_t ii_wcr;
int prbnum;
int s, cons_lock = 0;
ASSERT(NASID_TO_COMPACT_NODEID(nasid) != INVALID_CNODEID);
if (nasid == get_console_nasid()) {
PUTBUF_LOCK(s);
cons_lock = 1;
}
ii_iowa = REMOTE_HUB_L(nasid, IIO_OUTWIDGET_ACCESS);
REMOTE_HUB_S(nasid, IIO_OUTWIDGET_ACCESS, 0);
ii_wcr.wcr_reg_value = REMOTE_HUB_L(nasid, IIO_WCR);
direct_connect = ii_wcr.iwcr_dir_con;
if (direct_connect) {
/*
* Assume a bridge here.
*/
hub_setup_prb(nasid, 0, 3, conveyor);
} else {
/*
* Assume a crossbow here.
*/
hub_setup_prb(nasid, 0, 1, conveyor);
}
for (prbnum = HUB_WIDGET_ID_MIN; prbnum <= HUB_WIDGET_ID_MAX; prbnum++) {
/*
* XXX - Here's where we should take the widget type into
* when account assigning credits.
*/
/* Always set the PRBs in fire-and-forget mode */
hub_setup_prb(nasid, prbnum, 3, conveyor);
}
#ifdef IRIX
/*
* In direct connect mode, disable access to all widgets but 0.
* Later, the prom will do this for us.
*/
if (direct_connect)
ii_iowa = 1;
#endif
REMOTE_HUB_S(nasid, IIO_OUTWIDGET_ACCESS, ii_iowa);
if (cons_lock)
PUTBUF_UNLOCK(s);
}
/* ARGSUSED */
static void
assign_widgets_to_volunteers(devfs_handle_t xswitch, devfs_handle_t hubv)
{
xswitch_info_t xswitch_info;
xswitch_vol_t xvolinfo = NULL;
xwidgetnum_t widgetnum;
int num_volunteer;
nasid_t nasid;
hubinfo_t hubinfo;
extern int iobrick_type_get_nasid(nasid_t);
hubinfo_get(hubv, &hubinfo);
nasid = hubinfo->h_nasid;
xswitch_info = xswitch_info_get(xswitch);
ASSERT(xswitch_info != NULL);
(void)hwgraph_info_get_LBL(xswitch,
INFO_LBL_XSWITCH_VOL,
(arbitrary_info_t *)&xvolinfo);
if (xvolinfo == NULL) {
return;
}
num_volunteer = xvolinfo->xswitch_volunteer_count;
ASSERT(num_volunteer > 0);
/* Assign master hub for xswitch itself. */
if (HUB_WIDGET_ID_MIN > 0) {
hubv = xvolinfo->xswitch_volunteer[0];
xswitch_info_master_assignment_set(xswitch_info, (xwidgetnum_t)0, hubv);
}
/*
* TBD: Use administrative information to alter assignment of
* widgets to hubs.
*/
for (widgetnum=HUB_WIDGET_ID_MIN; widgetnum <= HUB_WIDGET_ID_MAX; widgetnum++) {
int i;
/*
* Ignore disabled/empty ports.
*/
if (!xbow_port_io_enabled(nasid, widgetnum))
continue;
/*
* If this is the master IO board, assign it to the same
* hub that owned it in the prom.
*/
if (is_master_nasid_widget(nasid, widgetnum)) {
for (i=0; i<num_volunteer; i++) {
hubv = xvolinfo->xswitch_volunteer[i];
hubinfo_get(hubv, &hubinfo);
nasid = hubinfo->h_nasid;
if (nasid == get_console_nasid())
goto do_assignment;
}
}
/*
* Assuming that we're dual-hosted and that PCI cards
* are naturally placed left-to-right, alternate PCI
* buses across both Cbricks. For Pbricks, and Ibricks,
* io_brick_map_widget() returns the PCI bus number
* associated with the given brick type and widget number.
* For Xbricks, it returns the XIO slot number.
*/
i = 0;
if (num_volunteer > 1) {
int bt;
bt = iobrick_type_get_nasid(nasid);
if (bt >= 0) {
/*
* PXBRICK has two busses per widget so this
* algorithm wouldn't work (all busses would
* be assigned to one volunteer). Change the
* bricktype to PBRICK whose mapping is setup
* suchthat 2 of the PICs will be assigned to
* one volunteer and the other one will be
* assigned to the other volunteer.
*/
if (bt == MODULE_PXBRICK)
bt = MODULE_PBRICK;
i = io_brick_map_widget(bt, widgetnum) & 1;
}
}
hubv = xvolinfo->xswitch_volunteer[i];
do_assignment:
/*
* At this point, we want to make hubv the master of widgetnum.
*/
xswitch_info_master_assignment_set(xswitch_info, widgetnum, hubv);
}
xswitch_volunteer_delete(xswitch);
}
/* ARGSUSED */
static void
assign_widgets_to_volunteers(devfs_handle_t xswitch, devfs_handle_t hubv)
{
int curr_volunteer, num_volunteer;
xwidgetnum_t widgetnum;
xswitch_info_t xswitch_info;
xswitch_vol_t xvolinfo = NULL;
nasid_t nasid;
hubinfo_t hubinfo;
hubinfo_get(hubv, &hubinfo);
nasid = hubinfo->h_nasid;
xswitch_info = xswitch_info_get(xswitch);
ASSERT(xswitch_info != NULL);
(void)hwgraph_info_get_LBL(xswitch,
INFO_LBL_XSWITCH_VOL,
(arbitrary_info_t *)&xvolinfo);
if (xvolinfo == NULL) {
#ifdef LATER
if (!is_headless_node_vertex(hubv)) {
#if defined(SUPPORT_PRINTING_V_FORMAT)
printk(KERN_WARNING "assign_widgets_to_volunteers:vertex %v has "
" no info label",
xswitch);
#else
printk(KERN_WARNING "assign_widgets_to_volunteers:vertex 0x%x has "
" no info label",
xswitch);
#endif
}
#endif /* LATER */
return;
}
num_volunteer = xvolinfo->xswitch_volunteer_count;
ASSERT(num_volunteer > 0);
curr_volunteer = 0;
/* Assign master hub for xswitch itself. */
if (HUB_WIDGET_ID_MIN > 0) {
hubv = xvolinfo->xswitch_volunteer[0];
xswitch_info_master_assignment_set(xswitch_info, (xwidgetnum_t)0, hubv);
}
/*
* TBD: Use administrative information to alter assignment of
* widgets to hubs.
*/
for (widgetnum=HUB_WIDGET_ID_MIN; widgetnum <= HUB_WIDGET_ID_MAX; widgetnum++) {
/*
* Ignore disabled/empty ports.
*/
if (!xbow_port_io_enabled(nasid, widgetnum))
continue;
/*
* If this is the master IO board, assign it to the same
* hub that owned it in the prom.
*/
if (is_master_nasid_widget(nasid, widgetnum)) {
int i;
for (i=0; i<num_volunteer; i++) {
hubv = xvolinfo->xswitch_volunteer[i];
hubinfo_get(hubv, &hubinfo);
nasid = hubinfo->h_nasid;
if (nasid == get_console_nasid())
goto do_assignment;
}
#ifdef LATER
PRINT_PANIC("Nasid == %d, console nasid == %d",
nasid, get_console_nasid());
#endif
}
/*
* Do a round-robin assignment among the volunteer nodes.
*/
hubv = xvolinfo->xswitch_volunteer[curr_volunteer];
curr_volunteer = (curr_volunteer + 1) % num_volunteer;
/* fall through */
do_assignment:
/*
* At this point, we want to make hubv the master of widgetnum.
*/
xswitch_info_master_assignment_set(xswitch_info, widgetnum, hubv);
}
xswitch_volunteer_delete(xswitch);
}
