source: trunk/kernel/kern/chdev.c @ 635

Last change on this file since 635 was 635, checked in by alain, 5 years ago

This version is a major evolution: The physical memory allocators,
defined in the kmem.c, ppm.c, and kcm.c files have been modified
to support remote accesses. The RPCs that were previously user
to allocate physical memory in a remote cluster have been removed.
This has been done to cure a dead-lock in case of concurrent page-faults.

This version 2.2 has been tested on a (4 clusters / 2 cores per cluster)
TSAR architecture, for both the "sort" and the "fft" applications.
File size: 21.7 KB
Line 
1/*
2 * chdev.c - channel device descriptor operations implementation.
3 *
4 * Authors  Alain Greiner   (2016)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH.is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH.is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH.; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <kernel_config.h>
25#include <hal_kernel_types.h>
26#include <hal_special.h>
27#include <hal_remote.h>
28#include <hal_irqmask.h>
29#include <printk.h>
30#include <boot_info.h>
31#include <xlist.h>
32#include <kmem.h>
33#include <scheduler.h>
34#include <thread.h>
35#include <rpc.h>
36#include <chdev.h>
37#include <devfs.h>
38
39//////////////////////////////////////////////////////////////////////////////////////
40// Extern global variables
41//////////////////////////////////////////////////////////////////////////////////////
42
43extern chdev_directory_t    chdev_dir;         // allocated in kernel_init.c
44
45
46#if (DEBUG_SYS_READ & 1)
47extern uint32_t enter_chdev_cmd_read;
48extern uint32_t exit_chdev_cmd_read;
49extern uint32_t enter_chdev_server_read;
50extern uint32_t exit_chdev_server_read;
51#endif
52
53#if (DEBUG_SYS_WRITE & 1)
54extern uint32_t enter_chdev_cmd_write;
55extern uint32_t exit_chdev_cmd_write;
56extern uint32_t enter_chdev_server_write;
57extern uint32_t exit_chdev_server_write;
58#endif
59
60////////////////////////////////////////////
61char * chdev_func_str( uint32_t func_type ) 
62{
63    switch ( func_type ) 
64    {
65        case DEV_FUNC_RAM: return "RAM";
66        case DEV_FUNC_ROM: return "ROM";
67        case DEV_FUNC_FBF: return "FBF";
68        case DEV_FUNC_IOB: return "IOB";
69        case DEV_FUNC_IOC: return "IOC";
70        case DEV_FUNC_MMC: return "MMC";
71        case DEV_FUNC_DMA: return "DMA";
72        case DEV_FUNC_NIC: return "NIC";
73        case DEV_FUNC_TIM: return "TIM";
74        case DEV_FUNC_TXT: return "TXT";
75        case DEV_FUNC_ICU: return "ICU";
76        case DEV_FUNC_PIC: return "PIC";
77        default:           return "undefined";
78    }
79}
80
81/////////////////////////////////////////
82chdev_t * chdev_create( uint32_t    func,
83                        uint32_t    impl,
84                        uint32_t    channel,
85                        uint32_t    is_rx,
86                        xptr_t      base )
87{
88    chdev_t    * chdev;
89    kmem_req_t   req;
90
91    // allocate memory for chdev
92    req.type   = KMEM_KCM;
93    req.order  = bits_log2( sizeof(chdev_t) );
94    req.flags  = AF_ZERO | AF_KERNEL;
95    chdev      = kmem_alloc( &req );
96
97    if( chdev == NULL ) return NULL;
98
99    // initialize lock
100    remote_busylock_init( XPTR( local_cxy , &chdev->wait_lock ), LOCK_CHDEV_QUEUE );
101
102    // initialise waiting queue
103    xlist_root_init( XPTR( local_cxy , &chdev->wait_root ) );
104
105    // initialize attributes
106    chdev->func    =  func;
107    chdev->impl    =  impl;
108    chdev->channel =  channel;
109    chdev->is_rx   =  is_rx;
110    chdev->base    =  base; 
111
112    return chdev;
113
114}  // end chdev_create()
115
116///////////////////////////////////
117void chdev_print( chdev_t * chdev )
118{
119    printk("\n - func      = %s"
120           "\n - channel   = %d"
121           "\n - base      = %l"
122           "\n - cmd       = %x"
123           "\n - isr       = %x"
124           "\n - chdev     = %x\n",
125           chdev_func_str(chdev->func),
126           chdev->channel,
127           chdev->base,
128           chdev->cmd,
129           chdev->isr,
130           chdev );
131}
132
133//////////////////////////////////////////////////
134void chdev_register_command( xptr_t     chdev_xp )
135{
136    thread_t * server_ptr;    // local pointer on server thread associated to chdev
137    xptr_t     server_xp;     // extended pointer on server thread
138    core_t   * core_ptr;      // local pointer on core running the server thread
139    uint32_t   server_lid;    // core running the server thread local index
140    xptr_t     lock_xp;       // extended pointer on lock protecting the chdev state
141
142#if (DEBUG_SYS_READ & 1)
143enter_chdev_cmd_read = (uint32_t)hal_get_cycles();
144#endif
145
146#if (DEBUG_SYS_WRITE & 1)
147enter_chdev_cmd_write = (uint32_t)hal_get_cycles();
148#endif
149
150    thread_t * this = CURRENT_THREAD;
151
152    // get chdev cluster and local pointer
153    cxy_t     chdev_cxy = GET_CXY( chdev_xp );
154    chdev_t * chdev_ptr = GET_PTR( chdev_xp );
155
156    // check calling thread can yield
157    thread_assert_can_yield( this , __FUNCTION__ );
158
159    // get local and extended pointers on server thread
160    server_ptr = (thread_t *)hal_remote_lpt( XPTR( chdev_cxy , &chdev_ptr->server) );
161    server_xp  = XPTR( chdev_cxy , server_ptr );
162
163    // get local pointer on core running the server thread
164    core_ptr   = (core_t *)hal_remote_lpt( XPTR( chdev_cxy , &server_ptr->core ) );
165
166    // get server core local index
167    server_lid = hal_remote_l32( XPTR( chdev_cxy , &core_ptr->lid ) );
168
169#if (DEBUG_CHDEV_CMD_RX || DEBUG_CHDEV_CMD_TX)
170bool_t      is_rx        = hal_remote_l32( XPTR( chdev_cxy , &chdev_ptr->is_rx ) );
171trdid_t     server_trdid = hal_remote_l32( XPTR( chdev_cxy , &server_ptr->trdid ) ); 
172process_t * process_ptr  = hal_remote_lpt( XPTR( chdev_cxy , &server_ptr->process ) );
173pid_t       server_pid   = hal_remote_l32( XPTR( chdev_cxy , &process_ptr->pid ) );
174#endif
175   
176#if DEBUG_CHDEV_CMD_RX
177uint32_t rx_cycle = (uint32_t)hal_get_cycles();
178if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
179printk("\n[%s] client thread[%x,%x] enter for RX / server[%x,%x] / cycle %d\n",
180__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid, rx_cycle );
181#endif
182
183#if DEBUG_CHDEV_CMD_TX
184uint32_t tx_cycle = (uint32_t)hal_get_cycles();
185if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
186printk("\n[%s] client thread[%x,%x] enter for TX / server[%x,%x] / cycle %d\n",
187__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid, tx_cycle );
188#endif
189
190    // build extended pointer on client thread xlist
191    xptr_t  list_xp    = XPTR( local_cxy , &this->wait_list );
192
193    // build extended pointer on chdev waiting queue root
194    xptr_t  root_xp    = XPTR( chdev_cxy , &chdev_ptr->wait_root );
195
196    // build extended pointer on lock protecting chdev waiting queue
197    lock_xp            = XPTR( chdev_cxy , &chdev_ptr->wait_lock );
198
199    // The following actions execute in critical section,
200    // because the lock_acquire / lock_release :
201    // (1) take the lock protecting the chdev state
202    // (2) register client thread in server queue
203    // (3) unblock the server thread and block client thread
204    // (4) send IPI to force server scheduling
205    // (5) release the lock protecting waiting queue
206
207    // 1. take the lock protecting chdev queue
208    remote_busylock_acquire( lock_xp );
209
210    // 2. register client thread in waiting queue
211    xlist_add_last( root_xp , list_xp );
212
213#if (DEBUG_CHDEV_CMD_TX & 1)
214if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
215printk("\n[%s] client thread[%x,%x] registered write request in chdev\n",
216__FUNCTION__, this->process->pid, this->trdid );
217#endif
218 
219#if (DEBUG_CHDEV_CMD_RX & 1)
220if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
221printk("\n[%s] client thread[%x,%x] registered read request in chdev\n",
222__FUNCTION__, this->process->pid, this->trdid );
223#endif
224 
225    // 3. client thread unblocks server thread and blocks itself
226    thread_unblock( server_xp , THREAD_BLOCKED_IDLE );
227    thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_IO );
228
229#if (DEBUG_CHDEV_CMD_TX & 1)
230if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
231printk("\n[%s] client thread[%x,%x] unblock server thread[%x,%x] and block itsef\n",
232__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid );
233#endif
234
235#if (DEBUG_CHDEV_CMD_RX & 1)
236if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
237printk("\n[%s] client thread[%x,%x] unblock server thread[%x,%x] and block itsef\n",
238__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid );
239#endif
240
241    // 4. send IPI to core running the server thread when server core != client core
242    if( (server_lid != this->core->lid) || (local_cxy != chdev_cxy) )
243    {
244        dev_pic_send_ipi( chdev_cxy , server_lid ); 
245
246#if (DEBUG_CHDEV_CMD_TX & 1)
247if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
248printk("\n[%s] client thread[%x,%x] sent IPI to TX server thread[%x,%x]\n",
249__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid );
250#endif
251
252#if (DEBUG_CHDEV_CMD_RX & 1)
253if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
254printk("\n[%s] client thread[%x,%x] sent IPI to RX server thread[%x,%x]\n",
255__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid );
256#endif
257
258    }
259 
260    // 5. release lock protecting chdev queue
261    remote_busylock_release( lock_xp );
262
263    // deschedule
264    sched_yield("blocked on I/O");
265
266#if DEBUG_CHDEV_CMD_RX
267rx_cycle = (uint32_t)hal_get_cycles();
268if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
269printk("\n[%s] client thread[%x,%x] exit for RX / cycle %d\n",
270__FUNCTION__, this->process->pid, this->trdid, rx_cycle );
271#endif
272
273#if DEBUG_CHDEV_CMD_TX
274tx_cycle = (uint32_t)hal_get_cycles();
275if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
276printk("\n[%s] client thread[%x,%x] exit for TX / cycle %d\n",
277__FUNCTION__, this->process->pid, this->trdid, tx_cycle );
278#endif
279
280#if (DEBUG_SYS_READ & 1)
281exit_chdev_cmd_read = (uint32_t)hal_get_cycles();
282#endif
283
284#if (DEBUG_SYS_WRITE & 1)
285exit_chdev_cmd_write = (uint32_t)hal_get_cycles();
286#endif
287
288}  // end chdev_register_command()
289
290/////////////////////////////////////////
291void chdev_server_func( chdev_t * chdev )
292{
293    xptr_t          client_xp;    // extended pointer on waiting thread
294    cxy_t           client_cxy;   // cluster of client thread
295    thread_t      * client_ptr;   // local pointer on client thread
296    thread_t      * server;       // local pointer on server thread
297    xptr_t          root_xp;      // extended pointer on device waiting queue root
298    xptr_t          lock_xp;      // extended pointer on lock ptotecting chdev queue
299
300    server = CURRENT_THREAD;
301
302    // build extended pointer on root of client threads queue
303    root_xp = XPTR( local_cxy , &chdev->wait_root );
304
305    // build extended pointer on lock protecting client threads queue
306    lock_xp = XPTR( local_cxy , &chdev->wait_lock );
307
308        // This infinite loop is executed by the DEV thread
309    // to handle commands registered in the chdev queue.
310    while( 1 )
311    {
312
313#if( DEBUG_CHDEV_SERVER_RX || DEBUG_CHDEV_SERVER_TX )
314uint32_t rx_cycle = (uint32_t)hal_get_cycles();
315if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
316printk("\n[%s] server thread[%x,%x] check TXT_RX channel %d / cycle %d\n",
317__FUNCTION__ , server->process->pid, server->trdid, chdev->channel, rx_cycle );
318#endif
319
320#if DEBUG_CHDEV_SERVER_TX
321uint32_t tx_cycle = (uint32_t)hal_get_cycles();
322if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
323printk("\n[%s] thread[%x,%x] check TXT_TX channel %d / cycle %d\n",
324__FUNCTION__ , server->process->pid, server->trdid, chdev->channel, tx_cycle );
325#endif
326
327        // check server thread can yield
328        thread_assert_can_yield( server , __FUNCTION__ );
329
330        // get the lock protecting the waiting queue
331        remote_busylock_acquire( lock_xp );
332
333        // check waiting queue state
334        if( xlist_is_empty( root_xp ) ) // waiting queue empty
335        {
336            // release lock protecting the waiting queue
337            remote_busylock_release( lock_xp );
338
339#if DEBUG_CHDEV_SERVER_RX
340rx_cycle = (uint32_t)hal_get_cycles();
341if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
342printk("\n[%s] server thread[%x,%x] found RX queue empty => blocks / cycle %d\n",
343__FUNCTION__ , server->process->pid, server->trdid, rx_cycle );
344#endif
345
346#if DEBUG_CHDEV_SERVER_TX
347tx_cycle = (uint32_t)hal_get_cycles();
348if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
349printk("\n[%s] server thread[%x,%x] found TX queue empty => blocks / cycle %d\n",
350__FUNCTION__ , server->process->pid, server->trdid, tx_cycle );
351#endif
352            // block
353            thread_block( XPTR( local_cxy , server ) , THREAD_BLOCKED_IDLE ); 
354
355            // deschedule
356            sched_yield("I/O queue empty");
357        } 
358        else                            // waiting queue not empty
359        {
360            // release lock protecting the waiting queue
361            remote_busylock_release( lock_xp );
362
363            // get extended pointer on first client thread
364            client_xp = XLIST_FIRST( root_xp , thread_t , wait_list );
365
366            // get client thread cluster and local pointer
367            client_cxy = GET_CXY( client_xp );
368            client_ptr = GET_PTR( client_xp );
369
370#if( DEBUG_CHDEV_SERVER_TX || DEBUG_CHDEV_SERVER_RX )
371process_t * process      = hal_remote_lpt( XPTR( client_cxy , &client_ptr->process ) );
372pid_t       client_pid   = hal_remote_l32( XPTR( client_cxy , &process->pid ) );
373trdid_t     client_trdid = hal_remote_l32( XPTR( client_cxy , &client_ptr->trdid ) );
374#endif
375
376#if DEBUG_CHDEV_SERVER_RX
377rx_cycle = (uint32_t)hal_get_cycles();
378if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
379printk("\n[%s] server thread[%x,%x] get command from client thread[%x,%x] / cycle %d\n",
380__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, rx_cycle );
381#endif
382
383#if DEBUG_CHDEV_SERVER_TX
384tx_cycle = (uint32_t)hal_get_cycles();
385if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
386printk("\n[%s] server thread[%x,%x] get command from client thread[%x,%x] / cycle %d\n",
387__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, tx_cycle );
388#endif
389
390#if (DEBUG_SYS_READ & 1)
391enter_chdev_server_read = (uint32_t)hal_get_cycles();
392#endif
393
394#if (DEBUG_SYS_WRITE & 1)
395enter_chdev_server_write = (uint32_t)hal_get_cycles();
396#endif
397
398            // call the (blocking) driver command function
399            // to launch I/O operation AND wait completion
400            chdev->cmd( client_xp );
401       
402            // unblock client thread when driver returns
403            thread_unblock( client_xp , THREAD_BLOCKED_IO );
404
405            // get the lock protecting the waiting queue
406            remote_busylock_acquire( lock_xp );
407
408            // remove this client thread from chdev waiting queue
409            xlist_unlink( XPTR( client_cxy , &client_ptr->wait_list ) );
410
411            // release lock protecting the waiting queue
412            remote_busylock_release( lock_xp );
413
414#if DEBUG_CHDEV_SERVER_RX
415rx_cycle = (uint32_t)hal_get_cycles();
416if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
417printk("\n[%s] thread[%x,%x] completes command for client thread[%x,%x] / cycle %d\n",
418__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, rx_cycle );
419#endif
420
421#if DEBUG_CHDEV_SERVER_TX
422tx_cycle = (uint32_t)hal_get_cycles();
423if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
424printk("\n[%s] thread[%x,%x] completes command for client thread[%x,%x] / cycle %d\n",
425__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, tX_cycle );
426#endif
427
428#if (DEBUG_SYS_READ & 1)
429exit_chdev_server_read = (uint32_t)hal_get_cycles();
430#endif
431
432#if (DEBUG_SYS_WRITE & 1)
433exit_chdev_server_write = (uint32_t)hal_get_cycles();
434#endif
435
436        }
437    }  // end while
438}  // end chdev_server_func()
439
440////////////////////////////////////////
441xptr_t chdev_from_file( xptr_t file_xp )
442{
443    cxy_t         file_cxy;
444    vfs_file_t  * file_ptr;
445    uint32_t      inode_type;
446    vfs_inode_t * inode_ptr;
447    chdev_t     * chdev_ptr;
448
449    assert( (file_xp != XPTR_NULL) ,
450    "file_xp == XPTR_NULL\n" );
451
452    // get cluster and local pointer on remote file descriptor
453    // associated inode and chdev are stored in same cluster as the file desc.
454    file_cxy  = GET_CXY( file_xp );
455    file_ptr  = (vfs_file_t *)GET_PTR( file_xp );
456
457    // get inode type from file descriptor
458    inode_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) );
459    inode_ptr  = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
460
461    assert( (inode_type == INODE_TYPE_DEV) ,
462    "inode type %d is not INODE_TYPE_DEV\n", inode_type );
463
464    // get chdev local pointer from inode extension
465    chdev_ptr = (chdev_t *)hal_remote_lpt( XPTR( file_cxy , &inode_ptr->extend ) );
466
467    return XPTR( file_cxy , chdev_ptr );
468
469}  // end chdev_from_file()
470
471//////////////////////////////
472void chdev_dir_display( void )
473{
474    uint32_t  i;
475    cxy_t     cxy;
476    chdev_t * ptr;
477    uint32_t  base;
478
479    // get pointers on TXT0 chdev
480    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
481    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
482    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
483
484    // get extended pointer on TXT0 lock
485    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
486
487    // get TXT0 lock
488    remote_busylock_acquire( lock_xp );
489
490    // header
491    nolock_printk("\n***** external chdevs directory *****\n");
492
493    // IOB
494    if (chdev_dir.iob != XPTR_NULL )
495    {
496        cxy  = GET_CXY( chdev_dir.iob );
497        ptr  = GET_PTR( chdev_dir.iob );
498        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
499        nolock_printk("  - iob       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
500    }
501
502    // PIC
503    cxy  = GET_CXY( chdev_dir.pic );
504    ptr  = GET_PTR( chdev_dir.pic );
505    base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
506    nolock_printk("  - pic       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
507
508    // TXT
509    for( i = 0 ; i < LOCAL_CLUSTER->nb_txt_channels ; i++ )
510    {
511        cxy = GET_CXY( chdev_dir.txt_rx[i] );
512        ptr = GET_PTR( chdev_dir.txt_rx[i] );
513        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
514        nolock_printk("  - txt_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
515
516        cxy = GET_CXY( chdev_dir.txt_tx[i] );
517        ptr = GET_PTR( chdev_dir.txt_tx[i] );
518        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
519        nolock_printk("  - txt_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
520    }
521
522    // IOC
523    for( i = 0 ; i < LOCAL_CLUSTER->nb_ioc_channels ; i++ )
524    {
525        cxy = GET_CXY( chdev_dir.ioc[i] );
526        ptr = GET_PTR( chdev_dir.ioc[i] );
527        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
528        nolock_printk("  - ioc[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
529    }
530
531    // FBF
532    for( i = 0 ; i < LOCAL_CLUSTER->nb_fbf_channels ; i++ )
533    {
534        cxy  = GET_CXY( chdev_dir.fbf[i] );
535        ptr  = GET_PTR( chdev_dir.fbf[i] );
536        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
537        nolock_printk("  - fbf[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
538    }
539
540    // NIC
541    for( i = 0 ; i < LOCAL_CLUSTER->nb_nic_channels ; i++ )
542    {
543        cxy = GET_CXY( chdev_dir.nic_rx[i] );
544        ptr = GET_PTR( chdev_dir.nic_rx[i] );
545        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
546        nolock_printk("  - nic_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
547
548        cxy = GET_CXY( chdev_dir.nic_tx[i] );
549        ptr = GET_PTR( chdev_dir.nic_tx[i] );
550        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
551        nolock_printk("  - nic_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
552    }
553
554    // release lock
555    remote_busylock_release( lock_xp );
556
557}  // end chdev_dir_display()
558
559///////////////////////////////////////////
560void chdev_queue_display( xptr_t chdev_xp )
561{
562    cxy_t       chdev_cxy;          // chdev cluster
563    chdev_t   * chdev_ptr;          // chdev local pointer
564    xptr_t      root_xp;            // extended pointer on waiting queuue root
565    char        name[16];           // local copie of chdev name
566    xptr_t      iter_xp;            // extended pointer on xlist_t field in waiting thread
567    xptr_t      thread_xp;          // extended pointer on thread registered in queue
568    cxy_t       thread_cxy;         // cluster identifier for waiting thread
569    thread_t  * thread_ptr;         // local pointer on waiting thread
570    trdid_t     trdid;              // waiting thread identifier
571    process_t * process;            // waiting thread process descriptor
572    pid_t       pid;                // waiting thread process identifier
573
574    // get cluster and local pointer on chdev
575    chdev_cxy = GET_CXY( chdev_xp );
576    chdev_ptr = GET_PTR( chdev_xp );
577
578    // get extended pointer on root of requests queue
579    root_xp = XPTR( chdev_cxy , &chdev_ptr->wait_root );
580
581    // get chdev name
582    hal_remote_strcpy( XPTR( local_cxy , name ), XPTR( chdev_cxy , chdev_ptr->name ) );
583
584    // get pointers on TXT0 chdev
585    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
586    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
587    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
588
589    // get extended pointer on TXT0 lock
590    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
591
592    // get TXT0 lock
593    remote_busylock_acquire( lock_xp );
594
595    // check queue empty
596    if( xlist_is_empty( root_xp ) )
597    {
598        nolock_printk("\n***** Waiting queue empty for chdev %s\n", name ); 
599    }
600    else
601    {
602        nolock_printk("\n***** Waiting queue for chdev %s\n", name ); 
603
604        // scan the waiting queue
605        XLIST_FOREACH( root_xp , iter_xp )
606        {
607            thread_xp  = XLIST_ELEMENT( iter_xp , thread_t , wait_list );
608            thread_cxy = GET_CXY( thread_xp );
609            thread_ptr = GET_PTR( thread_xp );
610            trdid      = hal_remote_l32 ( XPTR( thread_cxy , &thread_ptr->trdid   ) );
611            process    = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->process ) );
612                        pid        = hal_remote_l32 ( XPTR( thread_cxy , &process->pid        ) );
613
614            nolock_printk("- thread[%x,%x]\n", pid, trdid );
615        }
616    }
617
618    // release TXT0 lock
619    remote_busylock_release( lock_xp );
620
621}  // end chdev_queue_display()
622
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