FreeBSD/Linux Kernel Cross Reference
sys/norma/ipc_net.c

     /* 
      * Mach Operating System
      * Copyright (c) 1991,1992 Carnegie Mellon University
      * All Rights Reserved.
      * 
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
      * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /*
     * HISTORY
     * $Log:        ipc_net.c,v $
     * Revision 2.12  93/01/14  17:53:58  danner
     *      64bit cleanup. Proper spl typing.
     *      [92/12/01            af]
     * 
     * Revision 2.11  92/03/10  16:27:47  jsb
     *      Merged in norma branch changes as of NORMA_MK7.
     *      [92/03/09  12:49:32  jsb]
     * 
     * Revision 2.10.2.5  92/02/21  11:24:34  jsb
     *      Moved spl{on,off} definitions earlier in the file (before all uses).
     *      [92/02/18  08:03:01  jsb]
     * 
     *      Removed accidently included lint declarations of panic, etc.
     *      [92/02/16  11:17:48  jsb]
     * 
     *      Eliminated netipc_thread_wakeup/netipc_replenish race.
     *      [92/02/09  14:16:24  jsb]
     * 
     * Revision 2.10.2.4  92/02/18  19:14:43  jeffreyh
     *      [intel] added support for callhere debug option of iPSC.
     *      [92/02/13  13:02:21  jeffreyh]
     * 
     * Revision 2.10.2.3  92/01/21  21:51:30  jsb
     *      From sjs@osf.org: moved node_incarnation declaration here from
     *      ipc_ether.c.
     *      [92/01/17  14:37:03  jsb]
     * 
     *      New implementation of netipc lock routines which uses sploff/splon
     *      and which releases spl before calling interrupt handlers (but after
     *      taking netipc lock).
     *      [92/01/16  22:20:30  jsb]
     * 
     *      Removed panic in netipc_copy_grab: callers can now deal with failure.
     *      [92/01/14  21:59:10  jsb]
     * 
     *      In netipc_drain_intr_request, decrement request counts before calling
     *      interrupt routines, not after. This preserves assertion that there is
     *      at most one outstanding send or receive interrupt.
     *      [92/01/13  20:17:18  jsb]
     * 
     *      De-linted.
     *      [92/01/13  10:15:50  jsb]
     * 
     *      Now contains locking, allocation, and debugging printf routines.
     *      Purged log.
     *      [92/01/11  17:38:28  jsb]
     * 
     */ 
    /*
     *      File:   norma/ipc_net.c
     *      Author: Joseph S. Barrera III
     *      Date:   1991
     *
     *      Routines for reliable delivery and flow control for NORMA_IPC.
     */
    
    #include <norma/ipc_net.h>
    
    #if     i386 || i860
    #else
    #define sploff()        splhigh()
    #define splon(s)        splx(s)
    #endif
    
    /*
     * Not proven to be multiprocessor-safe
     */
    
    unsigned long node_incarnation = 1;             /* should never be zero */
    
    decl_simple_lock_data(,netipc_lock)
   
   thread_t netipc_lock_owner = THREAD_NULL;
   #define THREAD_INTR     ((thread_t) 1)
   
   int send_intr_request = 0;
   int recv_intr_request = 0;
   int timeout_intr_request = 0;
   
   #if     iPSC386 || iPSC860
   extern void     netipc_called_here();
   #endif  iPSC386 || iPSC860
   
   /*
    * Called with interrupts not explicitly disabled but with lock held.
    * Returns with interrupts as they were and with lock released.
    */
   int
   netipc_drain_intr_request()
   {
           spl_t   s;
   
           s = sploff();
   #if     iPSC386 || iPSC860
           netipc_called_here(__FILE__, __LINE__, "netipc_drain_intr_request");
   #endif  iPSC836 || iPSC860
           assert(netipc_lock_owner != THREAD_NULL);
           while (send_intr_request > 0 ||
                  recv_intr_request > 0 ||
                  timeout_intr_request > 0) {
                   /*
                    * Send and receive interrupts are counting interrupts.
                    * Many timeout interrupts map into one.
                    */
                   netipc_lock_owner = THREAD_INTR;
                   if (send_intr_request > 0) {
                           send_intr_request--;
                           splon(s);
   #if     iPSC386 || iPSC860
                           { int spl = spldcm();
   #endif  iPSC836 || iPSC860
                           _netipc_send_intr();
   #if     iPSC386 || iPSC860
                           splx(spl);}
   #endif  iPSC836 || iPSC860
                           s = sploff();
                   } else if (recv_intr_request > 0) {
                           recv_intr_request--;
                           splon(s);
   #if     iPSC386 || iPSC860
                           { int spl = spldcm();
   #endif  iPSC836 || iPSC860
                           _netipc_recv_intr();
   #if     iPSC386 || iPSC860
                           splx(spl);}
   #endif  iPSC836 || iPSC860
                           s = sploff();
                   } else {
                           assert(timeout_intr_request > 0);
                           timeout_intr_request = 0;
                           splon(s);
   #if     iPSC386 || iPSC860
                           { int spl = splclock();
   #endif  iPSC836 || iPSC860
                           _netipc_timeout_intr();
   #if     iPSC386 || iPSC860
                           splx(spl);}
   #endif  iPSC836 || iPSC860
                           s = sploff();
                   }
           }
           netipc_lock_owner = THREAD_NULL;
           splon(s);
   }
   
   /*
    * XXX
    * These testing functions should have spls.
    */
   
   boolean_t
   netipc_thread_locked()
   {
           return (netipc_lock_owner == current_thread());
   }
   
   boolean_t
   netipc_intr_locked()
   {
           return (netipc_lock_owner == THREAD_INTR);
   }
   
   boolean_t
   netipc_locked()
   {
           return (netipc_lock_owner != THREAD_NULL);
   }
   
   boolean_t
   netipc_unlocked()
   {
           return (netipc_lock_owner == THREAD_NULL);
   }
   
   void
   netipc_thread_lock()
   {
           spl_t s;
   
           /*
            * Threads fight among themselves.
            */
           simple_lock(&netipc_lock);
   
           /*
            * A single thread fights against interrupt handler.
            */
           s = sploff();
           assert(netipc_unlocked());
           netipc_lock_owner = current_thread();
           splon(s);
   }
   
   void
   netipc_thread_unlock()
   {
           assert(netipc_thread_locked());
   
           /*
            * Process queued interrupts, and release simple lock.
            */
           netipc_drain_intr_request();
           simple_unlock(&netipc_lock);
   }
   
   netipc_send_intr()
   {
           spl_t   s;
   
           s = sploff();
           if (netipc_lock_owner == THREAD_NULL) {
                   netipc_lock_owner = THREAD_INTR;
                   splon(s);
   #if     iPSC386 || iPSC860
                   { int spl = spldcm();
   #endif  iPSC836 || iPSC860
                   _netipc_send_intr();
   #if     iPSC386 || iPSC860
                   splx(spl);}
   #endif  iPSC836 || iPSC860
                   netipc_drain_intr_request();
           } else {
                   assert(send_intr_request == 0);
                   send_intr_request++;
                   splon(s);
           }
   }
   
   netipc_recv_intr()
   {
           spl_t s;
   
           s = sploff();
           if (netipc_lock_owner == THREAD_NULL) {
                   netipc_lock_owner = THREAD_INTR;
                   splon(s);
   #if     iPSC386 || iPSC860
                   { int spl = spldcm();
   #endif  iPSC836 || iPSC860
                   _netipc_recv_intr();
   #if     iPSC386 || iPSC860
                   splx(spl);}
   #endif  iPSC836 || iPSC860
                   netipc_drain_intr_request();
           } else {
                   assert(recv_intr_request == 0);
                   recv_intr_request++;
                   splon(s);
           }
   }
   
   netipc_timeout_intr()
   {
           spl_t s;
   
           s = sploff();
           if (netipc_lock_owner == THREAD_NULL) {
                   netipc_lock_owner = THREAD_INTR;
                   splon(s);
   #if     iPSC386 || iPSC860
                   { int spl = splclock();
   #endif  iPSC836 || iPSC860
                   _netipc_timeout_intr();
   #if     iPSC386 || iPSC860
                   splx(spl);}
   #endif  iPSC836 || iPSC860
                   netipc_drain_intr_request();
           } else {
                   timeout_intr_request = 1;
                   splon(s);
           }
   }
   
   extern int      netipc_self_stopped;
   
   boolean_t       netipc_thread_awake = FALSE;
   boolean_t       netipc_thread_reawaken = FALSE;
   int             netipc_thread_awaken = 0;
   vm_page_t       netipc_page_list = VM_PAGE_NULL;
   int             netipc_page_list_count = 0;
   int             netipc_page_list_low = 20;
   int             netipc_page_list_high = 30;
   
   extern zone_t   vm_map_copy_zone;
   vm_map_copy_t   netipc_vm_map_copy_list = VM_MAP_COPY_NULL;
   int             netipc_vm_map_copy_count = 0;
   
   netipc_page_put(m)
           vm_page_t m;
   {
           assert(netipc_locked());
   
           * (vm_page_t *) &m->pageq.next = netipc_page_list;
           netipc_page_list = m;
           netipc_page_list_count++;
           if (netipc_self_stopped) {
                   netipc_self_unstop();
           }
   }
   
   vm_map_copy_t
   netipc_copy_grab()
   {
           vm_map_copy_t copy;
   
           assert(netipc_locked());
           copy = netipc_vm_map_copy_list;
           if (copy != VM_MAP_COPY_NULL) {
                   netipc_vm_map_copy_list = (vm_map_copy_t) copy->type;
                   netipc_vm_map_copy_count--;
                   copy->type = VM_MAP_COPY_PAGE_LIST;
           }
           return copy;
   }
   
   void
   netipc_copy_ungrab(copy)
           vm_map_copy_t copy;
   {
           assert(netipc_locked());
           copy->type = (int) netipc_vm_map_copy_list;
           netipc_vm_map_copy_list = copy;
           netipc_vm_map_copy_count++;
   }
   
   netipc_thread_wakeup()
   {
           assert(netipc_locked());
           if (netipc_thread_awake) {
                   netipc_thread_reawaken = TRUE;
           } else {
                   thread_wakeup((vm_offset_t) &netipc_thread_awake);
           }
   }
   
   /*
    * XXX
    * The wakeup protocol for this loop is not quite correct...
    *
    * XXX
    * We should move the lists out all at once, not one elt at a time.
    *
    * XXX
    * The locking here is farcical.
    */
   netipc_replenish(always)
           boolean_t always;
   {
           vm_page_t m;
   
           assert(netipc_unlocked());
           netipc_output_replenish();      /* XXX move somewhere else */
           while (netipc_vm_map_copy_count < 300) {
                   vm_map_copy_t copy;
   
                   copy = (vm_map_copy_t) zalloc(vm_map_copy_zone);
                   netipc_thread_lock();
                   copy->type = (int) netipc_vm_map_copy_list;
                   netipc_vm_map_copy_list = copy;
                   netipc_vm_map_copy_count++;
                   netipc_thread_unlock();
           }
           if (current_thread()->vm_privilege) {
                   return; /* we might allocate from the reserved pool */
           }
           while (netipc_page_list_count < netipc_page_list_high) {
                   m = vm_page_grab();
                   if (m == VM_PAGE_NULL) {
                           break;
                   }
                   m->tabled = FALSE;
                   vm_page_init(m, m->phys_addr);
   
                   netipc_thread_lock();
                   * (vm_page_t *) &m->pageq.next = netipc_page_list;
                   netipc_page_list = m;
                   netipc_page_list_count++;
                   if (netipc_self_stopped) {
                           netipc_self_unstop();
                   }
                   netipc_thread_unlock();
           }
           while (always && netipc_page_list_count < netipc_page_list_low) {
                   while ((m = vm_page_grab()) == VM_PAGE_NULL) {
                           vm_page_wait(0);
                   }
                   m->tabled = FALSE;
                   vm_page_init(m, m->phys_addr);
   
                   netipc_thread_lock();
                   * (vm_page_t *) &m->pageq.next = netipc_page_list;
                   netipc_page_list = m;
                   netipc_page_list_count++;
                   if (netipc_self_stopped) {
                           netipc_self_unstop();
                   }
                   netipc_thread_unlock();
           }
   }
   
   /*
    * Grab a vm_page_t at interrupt level. May return VM_PAGE_NULL.
    */
   vm_page_t
   netipc_page_grab()
   {
           vm_page_t m;
   
           assert(netipc_locked());
           if ((m = netipc_page_list) != VM_PAGE_NULL) {
                   netipc_page_list = (vm_page_t) m->pageq.next;
                   netipc_page_list_count--;
           } else {
                   netipc_thread_wakeup();
           }
           return m;
   }
   
   void
   netipc_thread_continue()
   {
           netipc_thread_lock();
           for (;;) {
                   /*
                    * Record that we are awake.
                    * Look out for new awaken requests while we are out working.
                    */
                   netipc_thread_awaken++;
                   netipc_thread_awake = TRUE;
                   netipc_thread_reawaken = FALSE;
   
                   /*
                    * Call netipc_replenish with netipc lock unlocked.
                    */
                   netipc_thread_unlock();
                   netipc_replenish(TRUE);
                   netipc_thread_lock();
   
                   /*
                    * If we don't yet have enough pages, or someone
                    * came up with something new for us to do, then
                    * do more work before going to sleep.
                    */
                   if (netipc_page_list_count < netipc_page_list_low ||
                       netipc_thread_reawaken) {
                           continue;
                   }
   
                   /*
                    * Nothing left for us to do right now.  Go to sleep.
                    */
                   netipc_thread_awake = FALSE;
                   assert_wait((vm_offset_t) &netipc_thread_awake, FALSE);
                   (void) netipc_thread_unlock();
                   thread_block(netipc_thread_continue);
                   netipc_thread_lock();
           }
   }
   
   void
   netipc_thread()
   {
           thread_set_own_priority(0);     /* high priority */
           netipc_thread_continue();
   }
   
   int Noise0 = 0; /* print netipc packets */      
   int Noise1 = 0; /* notification and migration debugging */
   int Noise2 = 0; /* synch and timeout printfs */
   int Noise3 = 0; /* copy object continuation debugging */
   int Noise4 = 0; /* multiple out-of-line section debugging */
   int Noise5 = 0; /* obsolete acks */
   int Noise6 = 0; /* short print of rcvd packets, including msgh_id */
   
   extern cnputc();
   
   /* VARARGS */
   printf1(fmt, va_alist)
           char* fmt;
           va_dcl
   {
           va_list listp;
   
           if (Noise1) {
                   va_start(listp);
                   _doprnt(fmt, &listp, cnputc, 0);
                   va_end(listp);
           }
   }
   
   /* VARARGS */
   printf2(fmt, va_alist)
           char* fmt;
           va_dcl
   {
           va_list listp;
   
           if (Noise2) {
                   va_start(listp);
                   _doprnt(fmt, &listp, cnputc, 0);
                   va_end(listp);
           }
   }
   
   /* VARARGS */
   printf3(fmt, va_alist)
           char* fmt;
           va_dcl
   {
           va_list listp;
   
           if (Noise3) {
                   va_start(listp);
                   _doprnt(fmt, &listp, cnputc, 0);
                   va_end(listp);
           }
   }
   
   /* VARARGS */
   printf4(fmt, va_alist)
           char* fmt;
           va_dcl
   {
           va_list listp;
   
           if (Noise4) {
                   va_start(listp);
                   _doprnt(fmt, &listp, cnputc, 0);
                   va_end(listp);
           }
   }
   
   /* VARARGS */
   printf5(fmt, va_alist)
           char* fmt;
           va_dcl
   {
           va_list listp;
   
           if (Noise5) {
                   va_start(listp);
                   _doprnt(fmt, &listp, cnputc, 0);
                   va_end(listp);
           }
   }
   
   /* VARARGS */
   printf6(fmt, va_alist)
           char* fmt;
           va_dcl
   {
           va_list listp;
   
           if (Noise6) {
                   va_start(listp);
                   _doprnt(fmt, &listp, cnputc, 0);
                   va_end(listp);
           }
   }
   
   #if     iPSC386 || iPSC860
   #define MAX_CALLS       256
   char    *called_here_filename_buffer[MAX_CALLS];
   char    *called_here_notation_buffer[MAX_CALLS];
   int     called_here_line_buffer[MAX_CALLS];
   int     called_here_next = 0;
   
   void netipc_called_here(filename, line, notation)
           char    *filename, *notation;
           int     line;
   {
           spl_t   s;
           int     i;
   
           s = sploff();
           i = called_here_next++;
           if (called_here_next >= MAX_CALLS) {
                   called_here_next = 0;
           }
           called_here_filename_buffer[called_here_next] = 0;
           called_here_filename_buffer[i] = filename;
           called_here_notation_buffer[i] = notation;
           called_here_line_buffer[i] = line;
           splon(s);
   }
   
   
   void db_show_netipc_called_here()
   {
           int     i, j;
           char    *s, *slash;
   
           kdbprintf(" #   Line File\n");
           j = called_here_next - 1;
           for (i = 0; i < MAX_CALLS; i++) {
                   if (j < 0) {
                           j = MAX_CALLS - 1;
                   }
                   if (called_here_filename_buffer[j]) {
                           slash = 0;
                           for (s = called_here_filename_buffer[j]; *s; s++) {
                                   if (*s == '/')
                                           slash = s + 1;
                           }
                           kdbprintf("%3d %5d %s\t\t%s\n", j,
                                   called_here_line_buffer[j],
                                   slash ? slash : called_here_filename_buffer[j],
                                   called_here_notation_buffer[j]);
                           j--;
                   } else {
                           return;
                   }
           }
   }
   
   #endif  iPSC386 || iPSC860

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