ClabureDB: Classified Bug-Reports Database

   /*
   ** -----------------------------------------------------------------------------
   **
   **  Perle Specialix driver for Linux
   **  Ported from existing RIO Driver for SCO sources.
    *
    *  (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.
    *
    *      This program is free software; you can redistribute it and/or modify
   *      it under the terms of the GNU General Public License as published by
   *      the Free Software Foundation; either version 2 of the License, or
   *      (at your option) any later version.
   *
   *      This program is distributed in the hope that it will be useful,
   *      but WITHOUT ANY WARRANTY; without even the implied warranty of
   *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *      GNU General Public License for more details.
   *
   *      You should have received a copy of the GNU General Public License
   *      along with this program; if not, write to the Free Software
   *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  **
  **        Module                : rioroute.c
  **        SID                : 1.3
  **        Last Modified        : 11/6/98 10:33:46
  **        Retrieved        : 11/6/98 10:33:50
  **
  **  ident @(#)rioroute.c        1.3
  **
  ** -----------------------------------------------------------------------------
  */
  
  #include <linux/module.h>
  #include <linux/slab.h>
  #include <linux/errno.h>
  #include <asm/io.h>
  #include <asm/system.h>
  #include <asm/string.h>
  #include <asm/uaccess.h>
  
  #include <linux/termios.h>
  #include <linux/serial.h>
  
  #include <linux/generic_serial.h>
  
  
  #include "linux_compat.h"
  #include "rio_linux.h"
  #include "pkt.h"
  #include "daemon.h"
  #include "rio.h"
  #include "riospace.h"
  #include "cmdpkt.h"
  #include "map.h"
  #include "rup.h"
  #include "port.h"
  #include "riodrvr.h"
  #include "rioinfo.h"
  #include "func.h"
  #include "errors.h"
  #include "pci.h"
  
  #include "parmmap.h"
  #include "unixrup.h"
  #include "board.h"
  #include "host.h"
  #include "phb.h"
  #include "link.h"
  #include "cmdblk.h"
  #include "route.h"
  #include "cirrus.h"
  #include "rioioctl.h"
  #include "param.h"
  
  static int RIOCheckIsolated(struct rio_info *, struct Host *, unsigned int);
  static int RIOIsolate(struct rio_info *, struct Host *, unsigned int);
  static int RIOCheck(struct Host *, unsigned int);
  static void RIOConCon(struct rio_info *, struct Host *, unsigned int, unsigned int, unsigned int, unsigned int, int);
  
  
  /*
  ** Incoming on the ROUTE_RUP
  ** I wrote this while I was tired. Forgive me.
  */
  int RIORouteRup(struct rio_info *p, unsigned int Rup, struct Host *HostP, struct PKT __iomem * PacketP)
  {
          struct PktCmd __iomem *PktCmdP = (struct PktCmd __iomem *) PacketP->data;
          struct PktCmd_M *PktReplyP;
          struct CmdBlk *CmdBlkP;
          struct Port *PortP;
          struct Map *MapP;
          struct Top *TopP;
          int ThisLink, ThisLinkMin, ThisLinkMax;
          int port;
          int Mod, Mod1, Mod2;
          unsigned short RtaType;
          unsigned int RtaUniq;
          unsigned int ThisUnit, ThisUnit2;        /* 2 ids to accommodate 16 port RTA */
          unsigned int OldUnit, NewUnit, OldLink, NewLink;
         char *MyType, *MyName;
         int Lies;
         unsigned long flags;
 
         /*
          ** Is this unit telling us it's current link topology?
          */
         if (readb(&PktCmdP->Command) == ROUTE_TOPOLOGY) {
                 MapP = HostP->Mapping;
 
                 /*
                  ** The packet can be sent either by the host or by an RTA.
                  ** If it comes from the host, then we need to fill in the
                  ** Topology array in the host structure. If it came in
                  ** from an RTA then we need to fill in the Mapping structure's
                  ** Topology array for the unit.
                  */
                 if (Rup >= (unsigned short) MAX_RUP) {
                         ThisUnit = HOST_ID;
                         TopP = HostP->Topology;
                         MyType = "Host";
                         MyName = HostP->Name;
                         ThisLinkMin = ThisLinkMax = Rup - MAX_RUP;
                 } else {
                         ThisUnit = Rup + 1;
                         TopP = HostP->Mapping[Rup].Topology;
                         MyType = "RTA";
                         MyName = HostP->Mapping[Rup].Name;
                         ThisLinkMin = 0;
                         ThisLinkMax = LINKS_PER_UNIT - 1;
                 }
 
                 /*
                  ** Lies will not be tolerated.
                  ** If any pair of links claim to be connected to the same
                  ** place, then ignore this packet completely.
                  */
                 Lies = 0;
                 for (ThisLink = ThisLinkMin + 1; ThisLink <= ThisLinkMax; ThisLink++) {
                         /*
                          ** it won't lie about network interconnect, total disconnects
                          ** and no-IDs. (or at least, it doesn't *matter* if it does)
                          */
                         if (readb(&PktCmdP->RouteTopology[ThisLink].Unit) > (unsigned short) MAX_RUP)
                                 continue;
 
                         for (NewLink = ThisLinkMin; NewLink < ThisLink; NewLink++) {
                                 if ((readb(&PktCmdP->RouteTopology[ThisLink].Unit) == readb(&PktCmdP->RouteTopology[NewLink].Unit)) && (readb(&PktCmdP->RouteTopology[ThisLink].Link) == readb(&PktCmdP->RouteTopology[NewLink].Link))) {
                                         Lies++;
                                 }
                         }
                 }
 
                 if (Lies) {
                         rio_dprintk(RIO_DEBUG_ROUTE, "LIES! DAMN LIES! %d LIES!\n", Lies);
                         rio_dprintk(RIO_DEBUG_ROUTE, "%d:%c %d:%c %d:%c %d:%c\n",
                                     readb(&PktCmdP->RouteTopology[0].Unit),
                                     'A' + readb(&PktCmdP->RouteTopology[0].Link),
                                     readb(&PktCmdP->RouteTopology[1].Unit),
                                     'A' + readb(&PktCmdP->RouteTopology[1].Link), readb(&PktCmdP->RouteTopology[2].Unit), 'A' + readb(&PktCmdP->RouteTopology[2].Link), readb(&PktCmdP->RouteTopology[3].Unit), 'A' + readb(&PktCmdP->RouteTopology[3].Link));
                         return 1;
                 }
 
                 /*
                  ** now, process each link.
                  */
                 for (ThisLink = ThisLinkMin; ThisLink <= ThisLinkMax; ThisLink++) {
                         /*
                          ** this is what it was connected to
                          */
                         OldUnit = TopP[ThisLink].Unit;
                         OldLink = TopP[ThisLink].Link;
 
                         /*
                          ** this is what it is now connected to
                          */
                         NewUnit = readb(&PktCmdP->RouteTopology[ThisLink].Unit);
                         NewLink = readb(&PktCmdP->RouteTopology[ThisLink].Link);
 
                         if (OldUnit != NewUnit || OldLink != NewLink) {
                                 /*
                                  ** something has changed!
                                  */
 
                                 if (NewUnit > MAX_RUP && NewUnit != ROUTE_DISCONNECT && NewUnit != ROUTE_NO_ID && NewUnit != ROUTE_INTERCONNECT) {
                                         rio_dprintk(RIO_DEBUG_ROUTE, "I have a link from %s %s to unit %d:%d - I don't like it.\n", MyType, MyName, NewUnit, NewLink);
                                 } else {
                                         /*
                                          ** put the new values in
                                          */
                                         TopP[ThisLink].Unit = NewUnit;
                                         TopP[ThisLink].Link = NewLink;
 
                                         RIOSetChange(p);
 
                                         if (OldUnit <= MAX_RUP) {
                                                 /*
                                                  ** If something has become bust, then re-enable them messages
                                                  */
                                                 if (!p->RIONoMessage)
                                                         RIOConCon(p, HostP, ThisUnit, ThisLink, OldUnit, OldLink, DISCONNECT);
                                         }
 
                                         if ((NewUnit <= MAX_RUP) && !p->RIONoMessage)
                                                 RIOConCon(p, HostP, ThisUnit, ThisLink, NewUnit, NewLink, CONNECT);
 
                                         if (NewUnit == ROUTE_NO_ID)
                                                 rio_dprintk(RIO_DEBUG_ROUTE, "%s %s (%c) is connected to an unconfigured unit.\n", MyType, MyName, 'A' + ThisLink);
 
                                         if (NewUnit == ROUTE_INTERCONNECT) {
                                                 if (!p->RIONoMessage)
                                                         printk(KERN_DEBUG "rio: %s '%s' (%c) is connected to another network.\n", MyType, MyName, 'A' + ThisLink);
                                         }
 
                                         /*
                                          ** perform an update for 'the other end', so that these messages
                                          ** only appears once. Only disconnect the other end if it is pointing
                                          ** at us!
                                          */
                                         if (OldUnit == HOST_ID) {
                                                 if (HostP->Topology[OldLink].Unit == ThisUnit && HostP->Topology[OldLink].Link == ThisLink) {
                                                         rio_dprintk(RIO_DEBUG_ROUTE, "SETTING HOST (%c) TO DISCONNECTED!\n", OldLink + 'A');
                                                         HostP->Topology[OldLink].Unit = ROUTE_DISCONNECT;
                                                         HostP->Topology[OldLink].Link = NO_LINK;
                                                 } else {
                                                         rio_dprintk(RIO_DEBUG_ROUTE, "HOST(%c) WAS NOT CONNECTED TO %s (%c)!\n", OldLink + 'A', HostP->Mapping[ThisUnit - 1].Name, ThisLink + 'A');
                                                 }
                                         } else if (OldUnit <= MAX_RUP) {
                                                 if (HostP->Mapping[OldUnit - 1].Topology[OldLink].Unit == ThisUnit && HostP->Mapping[OldUnit - 1].Topology[OldLink].Link == ThisLink) {
                                                         rio_dprintk(RIO_DEBUG_ROUTE, "SETTING RTA %s (%c) TO DISCONNECTED!\n", HostP->Mapping[OldUnit - 1].Name, OldLink + 'A');
                                                         HostP->Mapping[OldUnit - 1].Topology[OldLink].Unit = ROUTE_DISCONNECT;
                                                         HostP->Mapping[OldUnit - 1].Topology[OldLink].Link = NO_LINK;
                                                 } else {
                                                         rio_dprintk(RIO_DEBUG_ROUTE, "RTA %s (%c) WAS NOT CONNECTED TO %s (%c)\n", HostP->Mapping[OldUnit - 1].Name, OldLink + 'A', HostP->Mapping[ThisUnit - 1].Name, ThisLink + 'A');
                                                 }
                                         }
                                         if (NewUnit == HOST_ID) {
                                                 rio_dprintk(RIO_DEBUG_ROUTE, "MARKING HOST (%c) CONNECTED TO %s (%c)\n", NewLink + 'A', MyName, ThisLink + 'A');
                                                 HostP->Topology[NewLink].Unit = ThisUnit;
                                                 HostP->Topology[NewLink].Link = ThisLink;
                                         } else if (NewUnit <= MAX_RUP) {
                                                 rio_dprintk(RIO_DEBUG_ROUTE, "MARKING RTA %s (%c) CONNECTED TO %s (%c)\n", HostP->Mapping[NewUnit - 1].Name, NewLink + 'A', MyName, ThisLink + 'A');
                                                 HostP->Mapping[NewUnit - 1].Topology[NewLink].Unit = ThisUnit;
                                                 HostP->Mapping[NewUnit - 1].Topology[NewLink].Link = ThisLink;
                                         }
                                 }
                                 RIOSetChange(p);
                                 RIOCheckIsolated(p, HostP, OldUnit);
                         }
                 }
                 return 1;
         }
 
         /*
          ** The only other command we recognise is a route_request command
          */
         if (readb(&PktCmdP->Command) != ROUTE_REQUEST) {
                 rio_dprintk(RIO_DEBUG_ROUTE, "Unknown command %d received on rup %d host %p ROUTE_RUP\n", readb(&PktCmdP->Command), Rup, HostP);
                 return 1;
         }
 
         RtaUniq = (readb(&PktCmdP->UniqNum[0])) + (readb(&PktCmdP->UniqNum[1]) << 8) + (readb(&PktCmdP->UniqNum[2]) << 16) + (readb(&PktCmdP->UniqNum[3]) << 24);
 
         /*
          ** Determine if 8 or 16 port RTA
          */
         RtaType = GetUnitType(RtaUniq);
 
         rio_dprintk(RIO_DEBUG_ROUTE, "Received a request for an ID for serial number %x\n", RtaUniq);
 
         Mod = readb(&PktCmdP->ModuleTypes);
         Mod1 = LONYBLE(Mod);
         if (RtaType == TYPE_RTA16) {
                 /*
                  ** Only one ident is set for a 16 port RTA. To make compatible
                  ** with 8 port, set 2nd ident in Mod2 to the same as Mod1.
                  */
                 Mod2 = Mod1;
                 rio_dprintk(RIO_DEBUG_ROUTE, "Backplane type is %s (all ports)\n", p->RIOModuleTypes[Mod1].Name);
         } else {
                 Mod2 = HINYBLE(Mod);
                 rio_dprintk(RIO_DEBUG_ROUTE, "Module types are %s (ports 0-3) and %s (ports 4-7)\n", p->RIOModuleTypes[Mod1].Name, p->RIOModuleTypes[Mod2].Name);
         }
 
         /*
          ** try to unhook a command block from the command free list.
          */
         if (!(CmdBlkP = RIOGetCmdBlk())) {
                 rio_dprintk(RIO_DEBUG_ROUTE, "No command blocks to route RTA! come back later.\n");
                 return 0;
         }
 
         /*
          ** Fill in the default info on the command block
          */
         CmdBlkP->Packet.dest_unit = Rup;
         CmdBlkP->Packet.dest_port = ROUTE_RUP;
         CmdBlkP->Packet.src_unit = HOST_ID;
         CmdBlkP->Packet.src_port = ROUTE_RUP;
         CmdBlkP->Packet.len = PKT_CMD_BIT | 1;
         CmdBlkP->PreFuncP = CmdBlkP->PostFuncP = NULL;
         PktReplyP = (struct PktCmd_M *) CmdBlkP->Packet.data;
 
         if (!RIOBootOk(p, HostP, RtaUniq)) {
                 rio_dprintk(RIO_DEBUG_ROUTE, "RTA %x tried to get an ID, but does not belong - FOAD it!\n", RtaUniq);
                 PktReplyP->Command = ROUTE_FOAD;
                 memcpy(PktReplyP->CommandText, "RT_FOAD", 7);
                 RIOQueueCmdBlk(HostP, Rup, CmdBlkP);
                 return 1;
         }
 
         /*
          ** Check to see if the RTA is configured for this host
          */
         for (ThisUnit = 0; ThisUnit < MAX_RUP; ThisUnit++) {
                 rio_dprintk(RIO_DEBUG_ROUTE, "Entry %d Flags=%s %s UniqueNum=0x%x\n",
                             ThisUnit, HostP->Mapping[ThisUnit].Flags & SLOT_IN_USE ? "Slot-In-Use" : "Not In Use", HostP->Mapping[ThisUnit].Flags & SLOT_TENTATIVE ? "Slot-Tentative" : "Not Tentative", HostP->Mapping[ThisUnit].RtaUniqueNum);
 
                 /*
                  ** We have an entry for it.
                  */
                 if ((HostP->Mapping[ThisUnit].Flags & (SLOT_IN_USE | SLOT_TENTATIVE)) && (HostP->Mapping[ThisUnit].RtaUniqueNum == RtaUniq)) {
                         if (RtaType == TYPE_RTA16) {
                                 ThisUnit2 = HostP->Mapping[ThisUnit].ID2 - 1;
                                 rio_dprintk(RIO_DEBUG_ROUTE, "Found unit 0x%x at slots %d+%d\n", RtaUniq, ThisUnit, ThisUnit2);
                         } else
                                 rio_dprintk(RIO_DEBUG_ROUTE, "Found unit 0x%x at slot %d\n", RtaUniq, ThisUnit);
                         /*
                          ** If we have no knowledge of booting it, then the host has
                          ** been re-booted, and so we must kill the RTA, so that it
                          ** will be booted again (potentially with new bins)
                          ** and it will then re-ask for an ID, which we will service.
                          */
                         if ((HostP->Mapping[ThisUnit].Flags & SLOT_IN_USE) && !(HostP->Mapping[ThisUnit].Flags & RTA_BOOTED)) {
                                 if (!(HostP->Mapping[ThisUnit].Flags & MSG_DONE)) {
                                         if (!p->RIONoMessage)
                                                 printk(KERN_DEBUG "rio: RTA '%s' is being updated.\n", HostP->Mapping[ThisUnit].Name);
                                         HostP->Mapping[ThisUnit].Flags |= MSG_DONE;
                                 }
                                 PktReplyP->Command = ROUTE_FOAD;
                                 memcpy(PktReplyP->CommandText, "RT_FOAD", 7);
                                 RIOQueueCmdBlk(HostP, Rup, CmdBlkP);
                                 return 1;
                         }
 
                         /*
                          ** Send the ID (entry) to this RTA. The ID number is implicit as
                          ** the offset into the table. It is worth noting at this stage
                          ** that offset zero in the table contains the entries for the
                          ** RTA with ID 1!!!!
                          */
                         PktReplyP->Command = ROUTE_ALLOCATE;
                         PktReplyP->IDNum = ThisUnit + 1;
                         if (RtaType == TYPE_RTA16) {
                                 if (HostP->Mapping[ThisUnit].Flags & SLOT_IN_USE)
                                         /*
                                          ** Adjust the phb and tx pkt dest_units for 2nd block of 8
                                          ** only if the RTA has ports associated (SLOT_IN_USE)
                                          */
                                         RIOFixPhbs(p, HostP, ThisUnit2);
                                 PktReplyP->IDNum2 = ThisUnit2 + 1;
                                 rio_dprintk(RIO_DEBUG_ROUTE, "RTA '%s' has been allocated IDs %d+%d\n", HostP->Mapping[ThisUnit].Name, PktReplyP->IDNum, PktReplyP->IDNum2);
                         } else {
                                 PktReplyP->IDNum2 = ROUTE_NO_ID;
                                 rio_dprintk(RIO_DEBUG_ROUTE, "RTA '%s' has been allocated ID %d\n", HostP->Mapping[ThisUnit].Name, PktReplyP->IDNum);
                         }
                         memcpy(PktReplyP->CommandText, "RT_ALLOCAT", 10);
 
                         RIOQueueCmdBlk(HostP, Rup, CmdBlkP);
 
                         /*
                          ** If this is a freshly booted RTA, then we need to re-open
                          ** the ports, if any where open, so that data may once more
                          ** flow around the system!
                          */
                         if ((HostP->Mapping[ThisUnit].Flags & RTA_NEWBOOT) && (HostP->Mapping[ThisUnit].SysPort != NO_PORT)) {
                                 /*
                                  ** look at the ports associated with this beast and
                                  ** see if any where open. If they was, then re-open
                                  ** them, using the info from the tty flags.
                                  */
                                 for (port = 0; port < PORTS_PER_RTA; port++) {
                                         PortP = p->RIOPortp[port + HostP->Mapping[ThisUnit].SysPort];
                                         if (PortP->State & (RIO_MOPEN | RIO_LOPEN)) {
                                                 rio_dprintk(RIO_DEBUG_ROUTE, "Re-opened this port\n");
                                                 rio_spin_lock_irqsave(&PortP->portSem, flags);
                                                 PortP->MagicFlags |= MAGIC_REBOOT;
                                                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
                                         }
                                 }
                                 if (RtaType == TYPE_RTA16) {
                                         for (port = 0; port < PORTS_PER_RTA; port++) {
                                                 PortP = p->RIOPortp[port + HostP->Mapping[ThisUnit2].SysPort];
                                                 if (PortP->State & (RIO_MOPEN | RIO_LOPEN)) {
                                                         rio_dprintk(RIO_DEBUG_ROUTE, "Re-opened this port\n");
                                                         rio_spin_lock_irqsave(&PortP->portSem, flags);
                                                         PortP->MagicFlags |= MAGIC_REBOOT;
                                                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
                                                 }
                                         }
                                 }
                         }
 
                         /*
                          ** keep a copy of the module types!
                          */
                         HostP->UnixRups[ThisUnit].ModTypes = Mod;
                         if (RtaType == TYPE_RTA16)
                                 HostP->UnixRups[ThisUnit2].ModTypes = Mod;
 
                         /*
                          ** If either of the modules on this unit is read-only or write-only
                          ** or none-xprint, then we need to transfer that info over to the
                          ** relevant ports.
                          */
                         if (HostP->Mapping[ThisUnit].SysPort != NO_PORT) {
                                 for (port = 0; port < PORTS_PER_MODULE; port++) {
                                         p->RIOPortp[port + HostP->Mapping[ThisUnit].SysPort]->Config &= ~RIO_NOMASK;
                                         p->RIOPortp[port + HostP->Mapping[ThisUnit].SysPort]->Config |= p->RIOModuleTypes[Mod1].Flags[port];
                                         p->RIOPortp[port + PORTS_PER_MODULE + HostP->Mapping[ThisUnit].SysPort]->Config &= ~RIO_NOMASK;
                                         p->RIOPortp[port + PORTS_PER_MODULE + HostP->Mapping[ThisUnit].SysPort]->Config |= p->RIOModuleTypes[Mod2].Flags[port];
                                 }
                                 if (RtaType == TYPE_RTA16) {
                                         for (port = 0; port < PORTS_PER_MODULE; port++) {
                                                 p->RIOPortp[port + HostP->Mapping[ThisUnit2].SysPort]->Config &= ~RIO_NOMASK;
                                                 p->RIOPortp[port + HostP->Mapping[ThisUnit2].SysPort]->Config |= p->RIOModuleTypes[Mod1].Flags[port];
                                                 p->RIOPortp[port + PORTS_PER_MODULE + HostP->Mapping[ThisUnit2].SysPort]->Config &= ~RIO_NOMASK;
                                                 p->RIOPortp[port + PORTS_PER_MODULE + HostP->Mapping[ThisUnit2].SysPort]->Config |= p->RIOModuleTypes[Mod2].Flags[port];
                                         }
                                 }
                         }
 
                         /*
                          ** Job done, get on with the interrupts!
                          */
                         return 1;
                 }
         }
         /*
          ** There is no table entry for this RTA at all.
          **
          ** Lets check to see if we actually booted this unit - if not,
          ** then we reset it and it will go round the loop of being booted
          ** we can then worry about trying to fit it into the table.
          */
         for (ThisUnit = 0; ThisUnit < HostP->NumExtraBooted; ThisUnit++)
                 if (HostP->ExtraUnits[ThisUnit] == RtaUniq)
                         break;
         if (ThisUnit == HostP->NumExtraBooted && ThisUnit != MAX_EXTRA_UNITS) {
                 /*
                  ** if the unit wasn't in the table, and the table wasn't full, then
                  ** we reset the unit, because we didn't boot it.
                  ** However, if the table is full, it could be that we did boot
                  ** this unit, and so we won't reboot it, because it isn't really
                  ** all that disasterous to keep the old bins in most cases. This
                  ** is a rather tacky feature, but we are on the edge of reallity
                  ** here, because the implication is that someone has connected
                  ** 16+MAX_EXTRA_UNITS onto one host.
                  */
                 static int UnknownMesgDone = 0;
 
                 if (!UnknownMesgDone) {
                         if (!p->RIONoMessage)
                                 printk(KERN_DEBUG "rio: One or more unknown RTAs are being updated.\n");
                         UnknownMesgDone = 1;
                 }
 
                 PktReplyP->Command = ROUTE_FOAD;
                 memcpy(PktReplyP->CommandText, "RT_FOAD", 7);
         } else {
                 /*
                  ** we did boot it (as an extra), and there may now be a table
                  ** slot free (because of a delete), so we will try to make
                  ** a tentative entry for it, so that the configurator can see it
                  ** and fill in the details for us.
                  */
                 if (RtaType == TYPE_RTA16) {
                         if (RIOFindFreeID(p, HostP, &ThisUnit, &ThisUnit2) == 0) {
                                 RIODefaultName(p, HostP, ThisUnit);
                                 rio_fill_host_slot(ThisUnit, ThisUnit2, RtaUniq, HostP);
                         }
                 } else {
                         if (RIOFindFreeID(p, HostP, &ThisUnit, NULL) == 0) {
                                 RIODefaultName(p, HostP, ThisUnit);
                                 rio_fill_host_slot(ThisUnit, 0, RtaUniq, HostP);
                         }
                 }
                 PktReplyP->Command = ROUTE_USED;
                 memcpy(PktReplyP->CommandText, "RT_USED", 7);
         }
         RIOQueueCmdBlk(HostP, Rup, CmdBlkP);
         return 1;
 }
 
 
 void RIOFixPhbs(struct rio_info *p, struct Host *HostP, unsigned int unit)
 {
         unsigned short link, port;
         struct Port *PortP;
         unsigned long flags;
         int PortN = HostP->Mapping[unit].SysPort;
 
         rio_dprintk(RIO_DEBUG_ROUTE, "RIOFixPhbs unit %d sysport %d\n", unit, PortN);
 
         if (PortN != -1) {
                 unsigned short dest_unit = HostP->Mapping[unit].ID2;
 
                 /*
                  ** Get the link number used for the 1st 8 phbs on this unit.
                  */
                 PortP = p->RIOPortp[HostP->Mapping[dest_unit - 1].SysPort];
 
                 link = readw(&PortP->PhbP->link);
 
                 for (port = 0; port < PORTS_PER_RTA; port++, PortN++) {
                         unsigned short dest_port = port + 8;
                         u16 __iomem *TxPktP;
                         struct PKT __iomem *Pkt;
 
                         PortP = p->RIOPortp[PortN];
 
                         rio_spin_lock_irqsave(&PortP->portSem, flags);
                         /*
                          ** If RTA is not powered on, the tx packets will be
                          ** unset, so go no further.
                          */
                         if (!PortP->TxStart) {
                                 rio_dprintk(RIO_DEBUG_ROUTE, "Tx pkts not set up yet\n");
                                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
                                 break;
                         }
 
                         /*
                          ** For the second slot of a 16 port RTA, the driver needs to
                          ** sort out the phb to port mappings. The dest_unit for this
                          ** group of 8 phbs is set to the dest_unit of the accompanying
                          ** 8 port block. The dest_port of the second unit is set to
                          ** be in the range 8-15 (i.e. 8 is added). Thus, for a 16 port
                          ** RTA with IDs 5 and 6, traffic bound for port 6 of unit 6
                          ** (being the second map ID) will be sent to dest_unit 5, port
                          ** 14. When this RTA is deleted, dest_unit for ID 6 will be
                          ** restored, and the dest_port will be reduced by 8.
                          ** Transmit packets also have a destination field which needs
                          ** adjusting in the same manner.
                          ** Note that the unit/port bytes in 'dest' are swapped.
                          ** We also need to adjust the phb and rup link numbers for the
                          ** second block of 8 ttys.
                          */
                         for (TxPktP = PortP->TxStart; TxPktP <= PortP->TxEnd; TxPktP++) {
                                 /*
                                  ** *TxPktP is the pointer to the transmit packet on the host
                                  ** card. This needs to be translated into a 32 bit pointer
                                  ** so it can be accessed from the driver.
                                  */
                                 Pkt = (struct PKT __iomem *) RIO_PTR(HostP->Caddr, readw(TxPktP));
 
                                 /*
                                  ** If the packet is used, reset it.
                                  */
                                 Pkt = (struct PKT __iomem *) ((unsigned long) Pkt & ~PKT_IN_USE);
                                 writeb(dest_unit, &Pkt->dest_unit);
                                 writeb(dest_port, &Pkt->dest_port);
                         }
                         rio_dprintk(RIO_DEBUG_ROUTE, "phb dest: Old %x:%x New %x:%x\n", readw(&PortP->PhbP->destination) & 0xff, (readw(&PortP->PhbP->destination) >> 8) & 0xff, dest_unit, dest_port);
                         writew(dest_unit + (dest_port << 8), &PortP->PhbP->destination);
                         writew(link, &PortP->PhbP->link);
 
                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
                 }
                 /*
                  ** Now make sure the range of ports to be serviced includes
                  ** the 2nd 8 on this 16 port RTA.
                  */
                 if (link > 3)
                         return;
                 if (((unit * 8) + 7) > readw(&HostP->LinkStrP[link].last_port)) {
                         rio_dprintk(RIO_DEBUG_ROUTE, "last port on host link %d: %d\n", link, (unit * 8) + 7);
                         writew((unit * 8) + 7, &HostP->LinkStrP[link].last_port);
                 }
         }
 }
 
 /*
 ** Check to see if the new disconnection has isolated this unit.
 ** If it has, then invalidate all its link information, and tell
 ** the world about it. This is done to ensure that the configurator
 ** only gets up-to-date information about what is going on.
 */
 static int RIOCheckIsolated(struct rio_info *p, struct Host *HostP, unsigned int UnitId)
 {
         unsigned long flags;
         rio_spin_lock_irqsave(&HostP->HostLock, flags);
 
         if (RIOCheck(HostP, UnitId)) {
                 rio_dprintk(RIO_DEBUG_ROUTE, "Unit %d is NOT isolated\n", UnitId);
                 rio_spin_unlock_irqrestore(&HostP->HostLock, flags);
                 return (0);
         }
 
         RIOIsolate(p, HostP, UnitId);
         RIOSetChange(p);
         rio_spin_unlock_irqrestore(&HostP->HostLock, flags);
         return 1;
 }
 
 /*
 ** Invalidate all the link interconnectivity of this unit, and of
 ** all the units attached to it. This will mean that the entire
 ** subnet will re-introduce itself.
 */
 static int RIOIsolate(struct rio_info *p, struct Host *HostP, unsigned int UnitId)
 {
         unsigned int link, unit;
 
         UnitId--;                /* this trick relies on the Unit Id being UNSIGNED! */
 
         if (UnitId >= MAX_RUP)        /* dontcha just lurv unsigned maths! */
                 return (0);
 
         if (HostP->Mapping[UnitId].Flags & BEEN_HERE)
                 return (0);
 
         HostP->Mapping[UnitId].Flags |= BEEN_HERE;
 
         if (p->RIOPrintDisabled == DO_PRINT)
                 rio_dprintk(RIO_DEBUG_ROUTE, "RIOMesgIsolated %s", HostP->Mapping[UnitId].Name);
 
         for (link = 0; link < LINKS_PER_UNIT; link++) {
                 unit = HostP->Mapping[UnitId].Topology[link].Unit;
                 HostP->Mapping[UnitId].Topology[link].Unit = ROUTE_DISCONNECT;
                 HostP->Mapping[UnitId].Topology[link].Link = NO_LINK;
                 RIOIsolate(p, HostP, unit);
         }
         HostP->Mapping[UnitId].Flags &= ~BEEN_HERE;
         return 1;
 }
 
 static int RIOCheck(struct Host *HostP, unsigned int UnitId)
 {
         unsigned char link;
 
 /*         rio_dprint(RIO_DEBUG_ROUTE, ("Check to see if unit %d has a route to the host\n",UnitId)); */
         rio_dprintk(RIO_DEBUG_ROUTE, "RIOCheck : UnitID = %d\n", UnitId);
 
         if (UnitId == HOST_ID) {
                 /* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d is NOT isolated - it IS the host!\n", UnitId)); */
                 return 1;
         }
 
         UnitId--;
 
         if (UnitId >= MAX_RUP) {
                 /* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d - ignored.\n", UnitId)); */
                 return 0;
         }
 
         for (link = 0; link < LINKS_PER_UNIT; link++) {
                 if (HostP->Mapping[UnitId].Topology[link].Unit == HOST_ID) {
                         /* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d is connected directly to host via link (%c).\n", 
                            UnitId, 'A'+link)); */
                         return 1;
                 }
         }
 
         if (HostP->Mapping[UnitId].Flags & BEEN_HERE) {
                 /* rio_dprint(RIO_DEBUG_ROUTE, ("Been to Unit %d before - ignoring\n", UnitId)); */
                 return 0;
         }
 
         HostP->Mapping[UnitId].Flags |= BEEN_HERE;
 
         for (link = 0; link < LINKS_PER_UNIT; link++) {
                 /* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d check link (%c)\n", UnitId,'A'+link)); */
                 if (RIOCheck(HostP, HostP->Mapping[UnitId].Topology[link].Unit)) {
                         /* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d is connected to something that knows the host via link (%c)\n", UnitId,link+'A')); */
                         HostP->Mapping[UnitId].Flags &= ~BEEN_HERE;
                         return 1;
                 }
         }
 
         HostP->Mapping[UnitId].Flags &= ~BEEN_HERE;
 
         /* rio_dprint(RIO_DEBUG_ROUTE, ("Unit %d DOESNT KNOW THE HOST!\n", UnitId)); */
 
         return 0;
 }
 
 /*
 ** Returns the type of unit (host, 16/8 port RTA)
 */
 
 unsigned int GetUnitType(unsigned int Uniq)
 {
         switch ((Uniq >> 28) & 0xf) {
         case RIO_AT:
         case RIO_MCA:
         case RIO_EISA:
         case RIO_PCI:
                 rio_dprintk(RIO_DEBUG_ROUTE, "Unit type: Host\n");
                 return (TYPE_HOST);
         case RIO_RTA_16:
                 rio_dprintk(RIO_DEBUG_ROUTE, "Unit type: 16 port RTA\n");
                 return (TYPE_RTA16);
         case RIO_RTA:
                 rio_dprintk(RIO_DEBUG_ROUTE, "Unit type: 8 port RTA\n");
                 return (TYPE_RTA8);
         default:
                 rio_dprintk(RIO_DEBUG_ROUTE, "Unit type: Unrecognised\n");
                 return (99);
         }
 }
 
 int RIOSetChange(struct rio_info *p)
 {
         if (p->RIOQuickCheck != NOT_CHANGED)
                 return (0);
         p->RIOQuickCheck = CHANGED;
         if (p->RIOSignalProcess) {
                 rio_dprintk(RIO_DEBUG_ROUTE, "Send SIG-HUP");
                 /*
                    psignal( RIOSignalProcess, SIGHUP );
                  */
         }
         return (0);
 }
 
 static void RIOConCon(struct rio_info *p,
                       struct Host *HostP,
                       unsigned int FromId,
                       unsigned int FromLink,
                       unsigned int ToId,
                       unsigned int ToLink,
                       int Change)
 {
         char *FromName;
         char *FromType;
         char *ToName;
         char *ToType;
         unsigned int tp;
 
 /*
 ** 15.10.1998 ARG - ESIL 0759
 ** (Part) fix for port being trashed when opened whilst RTA "disconnected"
 **
 ** What's this doing in here anyway ?
 ** It was causing the port to be 'unmapped' if opened whilst RTA "disconnected"
 **
 ** 09.12.1998 ARG - ESIL 0776 - part fix
 ** Okay, We've found out what this was all about now !
 ** Someone had botched this to use RIOHalted to indicated the number of RTAs
 ** 'disconnected'. The value in RIOHalted was then being used in the
 ** 'RIO_QUICK_CHECK' ioctl. A none zero value indicating that a least one RTA
 ** is 'disconnected'. The change was put in to satisfy a customer's needs.
 ** Having taken this bit of code out 'RIO_QUICK_CHECK' now no longer works for
 ** the customer.
 **
     if (Change == CONNECT) {
                 if (p->RIOHalted) p->RIOHalted --;
          }
          else {
                 p->RIOHalted ++;
          }
 **
 ** So - we need to implement it slightly differently - a new member of the
 ** rio_info struct - RIORtaDisCons (RIO RTA connections) keeps track of RTA
 ** connections and disconnections. 
 */
         if (Change == CONNECT) {
                 if (p->RIORtaDisCons)
                         p->RIORtaDisCons--;
         } else {
                 p->RIORtaDisCons++;
         }
 
         if (p->RIOPrintDisabled == DONT_PRINT)
                 return;
 
         if (FromId > ToId) {
                 tp = FromId;
                 FromId = ToId;
                 ToId = tp;
                 tp = FromLink;
                 FromLink = ToLink;
                 ToLink = tp;
         }
 
         FromName = FromId ? HostP->Mapping[FromId - 1].Name : HostP->Name;
         FromType = FromId ? "RTA" : "HOST";
         ToName = ToId ? HostP->Mapping[ToId - 1].Name : HostP->Name;
         ToType = ToId ? "RTA" : "HOST";
 
         rio_dprintk(RIO_DEBUG_ROUTE, "Link between %s '%s' (%c) and %s '%s' (%c) %s.\n", FromType, FromName, 'A' + FromLink, ToType, ToName, 'A' + ToLink, (Change == CONNECT) ? "established" : "disconnected");
         printk(KERN_DEBUG "rio: Link between %s '%s' (%c) and %s '%s' (%c) %s.\n", FromType, FromName, 'A' + FromLink, ToType, ToName, 'A' + ToLink, (Change == CONNECT) ? "established" : "disconnected");
 }
 
 /*
 ** RIORemoveFromSavedTable :
 **
 ** Delete and RTA entry from the saved table given to us
 ** by the configuration program.
 */
 static int RIORemoveFromSavedTable(struct rio_info *p, struct Map *pMap)
 {
         int entry;
 
         /*
          ** We loop for all entries even after finding an entry and
          ** zeroing it because we may have two entries to delete if
          ** it's a 16 port RTA.
          */
         for (entry = 0; entry < TOTAL_MAP_ENTRIES; entry++) {
                 if (p->RIOSavedTable[entry].RtaUniqueNum == pMap->RtaUniqueNum) {
                         memset(&p->RIOSavedTable[entry], 0, sizeof(struct Map));
                 }
         }
         return 0;
 }
 
 
 /*
 ** RIOCheckDisconnected :
 **
 ** Scan the unit links to and return zero if the unit is completely
 ** disconnected.
 */
 static int RIOFreeDisconnected(struct rio_info *p, struct Host *HostP, int unit)
 {
         int link;
 
 
         rio_dprintk(RIO_DEBUG_ROUTE, "RIOFreeDisconnect unit %d\n", unit);
         /*
          ** If the slot is tentative and does not belong to the
          ** second half of a 16 port RTA then scan to see if
          ** is disconnected.
          */
         for (link = 0; link < LINKS_PER_UNIT; link++) {
                 if (HostP->Mapping[unit].Topology[link].Unit != ROUTE_DISCONNECT)
                         break;
         }
 
         /*
          ** If not all links are disconnected then we can forget about it.
          */
         if (link < LINKS_PER_UNIT)
                 return 1;
 
 #ifdef NEED_TO_FIX_THIS
         /* Ok so all the links are disconnected. But we may have only just
          ** made this slot tentative and not yet received a topology update.
          ** Lets check how long ago we made it tentative.
          */
         rio_dprintk(RIO_DEBUG_ROUTE, "Just about to check LBOLT on entry %d\n", unit);
         if (drv_getparm(LBOLT, (ulong_t *) & current_time))
                 rio_dprintk(RIO_DEBUG_ROUTE, "drv_getparm(LBOLT,....) Failed.\n");
 
         elapse_time = current_time - TentTime[unit];
         rio_dprintk(RIO_DEBUG_ROUTE, "elapse %d = current %d - tent %d (%d usec)\n", elapse_time, current_time, TentTime[unit], drv_hztousec(elapse_time));
         if (drv_hztousec(elapse_time) < WAIT_TO_FINISH) {
                 rio_dprintk(RIO_DEBUG_ROUTE, "Skipping slot %d, not timed out yet %d\n", unit, drv_hztousec(elapse_time));
                 return 1;
         }
 #endif
 
         /*
          ** We have found an usable slot.
          ** If it is half of a 16 port RTA then delete the other half.
          */
         if (HostP->Mapping[unit].ID2 != 0) {
                 int nOther = (HostP->Mapping[unit].ID2) - 1;
 
                 rio_dprintk(RIO_DEBUG_ROUTE, "RioFreedis second slot %d.\n", nOther);
                 memset(&HostP->Mapping[nOther], 0, sizeof(struct Map));
         }
         RIORemoveFromSavedTable(p, &HostP->Mapping[unit]);
 
         return 0;
 }
 
 
 /*
 ** RIOFindFreeID :
 **
 ** This function scans the given host table for either one
 ** or two free unit ID's.
 */
 
 int RIOFindFreeID(struct rio_info *p, struct Host *HostP, unsigned int * pID1, unsigned int * pID2)
 {
         int unit, tempID;
 
         /*
          ** Initialise the ID's to MAX_RUP.
          ** We do this to make the loop for setting the ID's as simple as
          ** possible.
          */
         *pID1 = MAX_RUP;
         if (pID2 != NULL)
                 *pID2 = MAX_RUP;
 
         /*
          ** Scan all entries of the host mapping table for free slots.
          ** We scan for free slots first and then if that is not successful
          ** we start all over again looking for tentative slots we can re-use.
          */
         for (unit = 0; unit < MAX_RUP; unit++) {
                 rio_dprintk(RIO_DEBUG_ROUTE, "Scanning unit %d\n", unit);
                 /*
                  ** If the flags are zero then the slot is empty.
                  */
                 if (HostP->Mapping[unit].Flags == 0) {
                         rio_dprintk(RIO_DEBUG_ROUTE, "      This slot is empty.\n");
                         /*
                          ** If we haven't allocated the first ID then do it now.
                          */
                         if (*pID1 == MAX_RUP) {
                                 rio_dprintk(RIO_DEBUG_ROUTE, "Make tentative entry for first unit %d\n", unit);
                                 *pID1 = unit;
 
                                 /*
                                  ** If the second ID is not needed then we can return
                                  ** now.
                                  */
                                 if (pID2 == NULL)
                                         return 0;
                         } else {
                                 /*
                                  ** Allocate the second slot and return.
                                  */
                                 rio_dprintk(RIO_DEBUG_ROUTE, "Make tentative entry for second unit %d\n", unit);
                                 *pID2 = unit;
                                 return 0;
                         }
                 }
         }
 
         /*
          ** If we manage to come out of the free slot loop then we
          ** need to start all over again looking for tentative slots
          ** that we can re-use.
          */
         rio_dprintk(RIO_DEBUG_ROUTE, "Starting to scan for tentative slots\n");
         for (unit = 0; unit < MAX_RUP; unit++) {
                 if (((HostP->Mapping[unit].Flags & SLOT_TENTATIVE) || (HostP->Mapping[unit].Flags == 0)) && !(HostP->Mapping[unit].Flags & RTA16_SECOND_SLOT)) {
                         rio_dprintk(RIO_DEBUG_ROUTE, "    Slot %d looks promising.\n", unit);
 
                         if (unit == *pID1) {
                                 rio_dprintk(RIO_DEBUG_ROUTE, "    No it isn't, its the 1st half\n");
                                 continue;
                         }
 
                         /*
                          ** Slot is Tentative or Empty, but not a tentative second
                          ** slot of a 16 porter.
                          ** Attempt to free up this slot (and its parnter if
                          ** it is a 16 port slot. The second slot will become
                          ** empty after a call to RIOFreeDisconnected so thats why
                          ** we look for empty slots above  as well).
                          */
                         if (HostP->Mapping[unit].Flags != 0)
                                 if (RIOFreeDisconnected(p, HostP, unit) != 0)
                                         continue;
                         /*
                          ** If we haven't allocated the first ID then do it now.
                          */
                         if (*pID1 == MAX_RUP) {
                                 rio_dprintk(RIO_DEBUG_ROUTE, "Grab tentative entry for first unit %d\n", unit);
                                 *pID1 = unit;
 
                                 /*
                                  ** Clear out this slot now that we intend to use it.
                                  */
                                 memset(&HostP->Mapping[unit], 0, sizeof(struct Map));
 
                                 /*
                                  ** If the second ID is not needed then we can return
                                  ** now.
                                  */
                                 if (pID2 == NULL)
                                         return 0;
                         } else {
                                 /*
                                  ** Allocate the second slot and return.
                                  */
                                 rio_dprintk(RIO_DEBUG_ROUTE, "Grab tentative/empty  entry for second unit %d\n", unit);
                                 *pID2 = unit;
 
                                 /*
                                  ** Clear out this slot now that we intend to use it.
                                  */
                                 memset(&HostP->Mapping[unit], 0, sizeof(struct Map));
 
                                 /* At this point under the right(wrong?) conditions
                                  ** we may have a first unit ID being higher than the
                                  ** second unit ID. This is a bad idea if we are about
                                  ** to fill the slots with a 16 port RTA.
                                  ** Better check and swap them over.
                                  */
 
                                 if (*pID1 > *pID2) {
                                        rio_dprintk(RIO_DEBUG_ROUTE, "Swapping IDS %d %d\n", *pID1, *pID2);
                                        tempID = *pID1;
                                        *pID1 = *pID2;
                                        *pID2 = tempID;
                                }
                                return 0;
                        }
                }
        }

        /*
         ** If we manage to get to the end of the second loop then we
         ** can give up and return a failure.
         */
        return 1;
}


/*
** The link switch scenario.
**
** Rta Wun (A) is connected to Tuw (A).
** The tables are all up to date, and the system is OK.
**
** If Wun (A) is now moved to Wun (B) before Wun (A) can
** become disconnected, then the follow happens:
**
** Tuw (A) spots the change of unit:link at the other end
** of its link and Tuw sends a topology packet reflecting
** the change: Tuw (A) now disconnected from Wun (A), and
** this is closely followed by a packet indicating that 
** Tuw (A) is now connected to Wun (B).
**
** Wun (B) will spot that it has now become connected, and
** Wun will send a topology packet, which indicates that
** both Wun (A) and Wun (B) is connected to Tuw (A).
**
** Eventually Wun (A) realises that it is now disconnected
** and Wun will send out a topology packet indicating that
** Wun (A) is now disconnected.
*/