source: trunk/kernel/kern/chdev.c @ 687

Last change on this file since 687 was 683, checked in by alain, 4 years ago

All modifications required to support the <tcp_chat> application
including error recovery in case of packet loss.A
File size: 22.2 KB
Line 
1/*
2 * chdev.c - channel device API implementation.
3 *
4 * Authors  Alain Greiner   (2016,2017,2018,2019,2020)
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
90    // allocate memory for chdev
91    chdev = kmem_alloc( bits_log2(sizeof(chdev_t)) , AF_ZERO | AF_KERNEL );
92
93    if( chdev == NULL ) return NULL;
94
95    // initialize lock
96    remote_busylock_init( XPTR( local_cxy , &chdev->wait_lock ), LOCK_CHDEV_QUEUE );
97
98    // initialise waiting queue
99    xlist_root_init( XPTR( local_cxy , &chdev->wait_root ) );
100
101    // initialize attributes
102    chdev->func    =  func;
103    chdev->impl    =  impl;
104    chdev->channel =  channel;
105    chdev->is_rx   =  is_rx;
106    chdev->base    =  base; 
107
108    return chdev;
109
110}  // end chdev_create()
111
112/////////////////////////////////////
113void chdev_display( xptr_t chdev_xp )
114{
115    chdev_t * chdev = GET_PTR( chdev_xp );
116    cxy_t     cxy   = GET_CXY( chdev_xp );
117
118    char      name[16];
119
120    hal_remote_memcpy( XPTR( local_cxy, name ),
121                       XPTR( cxy , &chdev->name ), 16 );
122
123    printk("\n - chdev     = [%x,%x]"
124           "\n - name      = %s"
125           "\n - base      = [%x,%x]"
126           "\n - cmd       = %x"
127           "\n - isr       = %x\n",
128           cxy,
129           chdev,
130           name,
131           GET_CXY( hal_remote_l64( XPTR( cxy , &chdev->base ))),
132           GET_PTR( hal_remote_l64( XPTR( cxy , &chdev->base ))),
133           hal_remote_lpt( XPTR( cxy , &chdev->cmd )),
134           hal_remote_lpt( XPTR( cxy , &chdev->isr )) );
135
136}  // end chdev_display()
137
138//////////////////////////////////////////////////
139void chdev_register_command( xptr_t     chdev_xp )
140{
141    thread_t * server_ptr;    // local pointer on server thread associated to chdev
142    xptr_t     server_xp;     // extended pointer on server thread
143    core_t   * core_ptr;      // local pointer on core running the server thread
144    uint32_t   server_lid;    // core running the server thread local index
145    xptr_t     lock_xp;       // extended pointer on lock protecting the chdev state
146
147#if (DEBUG_SYS_READ & 1)
148enter_chdev_cmd_read = (uint32_t)hal_get_cycles();
149#endif
150
151#if (DEBUG_SYS_WRITE & 1)
152enter_chdev_cmd_write = (uint32_t)hal_get_cycles();
153#endif
154
155    thread_t * this      = CURRENT_THREAD;
156    xptr_t     client_xp = XPTR( local_cxy , this );
157
158    // get chdev cluster and local pointer
159    cxy_t     chdev_cxy = GET_CXY( chdev_xp );
160    chdev_t * chdev_ptr = GET_PTR( chdev_xp );
161
162    // check calling thread can yield
163    thread_assert_can_yield( this , __FUNCTION__ );
164
165    // get local and extended pointers on server thread
166    server_ptr = (thread_t *)hal_remote_lpt( XPTR( chdev_cxy , &chdev_ptr->server) );
167    server_xp  = XPTR( chdev_cxy , server_ptr );
168
169    // get local pointer on core running the server thread
170    core_ptr   = (core_t *)hal_remote_lpt( XPTR( chdev_cxy , &server_ptr->core ) );
171
172    // get server core local index
173    server_lid = hal_remote_l32( XPTR( chdev_cxy , &core_ptr->lid ) );
174
175#if (DEBUG_CHDEV_CMD_RX || DEBUG_CHDEV_CMD_TX)
176bool_t      is_rx        = hal_remote_l32( XPTR( chdev_cxy , &chdev_ptr->is_rx ) );
177trdid_t     server_trdid = hal_remote_l32( XPTR( chdev_cxy , &server_ptr->trdid ) ); 
178process_t * process_ptr  = hal_remote_lpt( XPTR( chdev_cxy , &server_ptr->process ) );
179pid_t       server_pid   = hal_remote_l32( XPTR( chdev_cxy , &process_ptr->pid ) );
180#endif
181   
182#if DEBUG_CHDEV_CMD_RX
183uint32_t rx_cycle = (uint32_t)hal_get_cycles();
184if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
185printk("\n[%s] client thread[%x,%x] enter for RX / server[%x,%x] / cycle %d\n",
186__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid, rx_cycle );
187#endif
188
189#if DEBUG_CHDEV_CMD_TX
190uint32_t tx_cycle = (uint32_t)hal_get_cycles();
191if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
192printk("\n[%s] client thread[%x,%x] enter for TX / server[%x,%x] / cycle %d\n",
193__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid, tx_cycle );
194#endif
195
196    // build extended pointer on client thread xlist
197    xptr_t  list_xp    = XPTR( local_cxy , &this->wait_list );
198
199    // build extended pointer on chdev waiting queue root
200    xptr_t  root_xp    = XPTR( chdev_cxy , &chdev_ptr->wait_root );
201
202    // build extended pointer on lock protecting chdev waiting queue
203    lock_xp            = XPTR( chdev_cxy , &chdev_ptr->wait_lock );
204
205    // The following actions are executed in critical section,
206    // (because the busylock_acquire / busylock_release)
207    // (1) take the lock protecting the waiting queue
208    // (2) register client thread in server queue
209    // (3) unblock the server thread and block client thread
210    // (4) send IPI to force server scheduling
211    // (5) release the lock protecting waiting queue
212
213    // 1. take the lock protecting chdev queue
214    remote_busylock_acquire( lock_xp );
215
216    // 2. register client thread in waiting queue
217    xlist_add_last( root_xp , list_xp );
218
219#if (DEBUG_CHDEV_CMD_TX & 1)
220if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
221printk("\n[%s] client thread[%x,%x] registered write request in chdev\n",
222__FUNCTION__, this->process->pid, this->trdid );
223#endif
224 
225#if (DEBUG_CHDEV_CMD_RX & 1)
226if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
227printk("\n[%s] client thread[%x,%x] registered read request in chdev\n",
228__FUNCTION__, this->process->pid, this->trdid );
229#endif
230 
231    // 3. client thread unblocks server thread and blocks itself
232    thread_unblock( server_xp , THREAD_BLOCKED_CLIENT );
233    thread_block( client_xp , THREAD_BLOCKED_IO );
234
235#if (DEBUG_CHDEV_CMD_TX & 1)
236if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_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#if (DEBUG_CHDEV_CMD_RX & 1)
242if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
243printk("\n[%s] client thread[%x,%x] unblock server thread[%x,%x] and block itsef\n",
244__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid );
245#endif
246
247    // 4. send IPI to core running the server thread when server core != client core
248    if( (server_lid != this->core->lid) || (local_cxy != chdev_cxy) )
249    {
250        dev_pic_send_ipi( chdev_cxy , server_lid ); 
251
252#if (DEBUG_CHDEV_CMD_TX & 1)
253if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
254printk("\n[%s] client thread[%x,%x] sent IPI to TX server thread[%x,%x]\n",
255__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid );
256#endif
257
258#if (DEBUG_CHDEV_CMD_RX & 1)
259if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
260printk("\n[%s] client thread[%x,%x] sent IPI to RX server thread[%x,%x]\n",
261__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid );
262#endif
263
264    }
265 
266    // 5. release lock protecting chdev queue
267    remote_busylock_release( lock_xp );
268
269    // deschedule
270    sched_yield("blocked on I/O");
271
272#if DEBUG_CHDEV_CMD_RX
273rx_cycle = (uint32_t)hal_get_cycles();
274if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
275printk("\n[%s] client thread[%x,%x] exit for RX / cycle %d\n",
276__FUNCTION__, this->process->pid, this->trdid, rx_cycle );
277#endif
278
279#if DEBUG_CHDEV_CMD_TX
280tx_cycle = (uint32_t)hal_get_cycles();
281if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
282printk("\n[%s] client thread[%x,%x] exit for TX / cycle %d\n",
283__FUNCTION__, this->process->pid, this->trdid, tx_cycle );
284#endif
285
286#if (DEBUG_SYS_READ & 1)
287exit_chdev_cmd_read = (uint32_t)hal_get_cycles();
288#endif
289
290#if (DEBUG_SYS_WRITE & 1)
291exit_chdev_cmd_write = (uint32_t)hal_get_cycles();
292#endif
293
294}  // end chdev_register_command()
295
296/////////////////////////////////////////
297void chdev_server_func( chdev_t * chdev )
298{
299    xptr_t          client_xp;    // extended pointer on waiting thread
300    cxy_t           client_cxy;   // cluster of client thread
301    thread_t      * client_ptr;   // local pointer on client thread
302    thread_t      * server;       // local pointer on server thread
303    xptr_t          root_xp;      // extended pointer on device waiting queue root
304    xptr_t          lock_xp;      // extended pointer on lock ptotecting chdev queue
305
306    server = CURRENT_THREAD;
307
308#if( DEBUG_CHDEV_SERVER_RX || DEBUG_CHDEV_SERVER_TX )
309uint32_t rx_cycle = (uint32_t)hal_get_cycles();
310if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
311printk("\n[%s] RX server thread[%x,%x] enter / channel %d / cycle %d\n",
312__FUNCTION__ , server->process->pid, server->trdid, chdev->channel, rx_cycle );
313#endif
314
315#if DEBUG_CHDEV_SERVER_TX
316uint32_t tx_cycle = (uint32_t)hal_get_cycles();
317if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
318printk("\n[%s] TX server thread[%x,%x] enter / channel %d / cycle %d\n",
319__FUNCTION__ , server->process->pid, server->trdid, chdev->channel, tx_cycle );
320#endif
321
322    // build extended pointer on root & lock of client threads queue
323    root_xp = XPTR( local_cxy , &chdev->wait_root );
324    lock_xp = XPTR( local_cxy , &chdev->wait_lock );
325
326        // This infinite loop is executed by the DEV thread
327    // to handle commands registered in the chdev queue.
328    while( 1 )
329    {
330        // check server thread can yield
331        thread_assert_can_yield( server , __FUNCTION__ );
332
333        // get the lock protecting the waiting queue
334        remote_busylock_acquire( lock_xp );
335
336        // check waiting queue state
337        if( xlist_is_empty( root_xp ) )                      // waiting queue empty
338        {
339            // release lock protecting the waiting queue
340            remote_busylock_release( lock_xp );
341
342#if DEBUG_CHDEV_SERVER_RX
343rx_cycle = (uint32_t)hal_get_cycles();
344if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
345printk("\n[%s] RX server thread[%x,%x] blocks & deschedules / cycle %d\n",
346__FUNCTION__ , server->process->pid, server->trdid, rx_cycle );
347#endif
348
349#if DEBUG_CHDEV_SERVER_TX
350tx_cycle = (uint32_t)hal_get_cycles();
351if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
352printk("\n[%s] TX server thread[%x,%x] blocks & deschedules / cycle %d\n",
353__FUNCTION__ , server->process->pid, server->trdid, tx_cycle );
354#endif
355            // block and deschedule
356            thread_block( XPTR( local_cxy , server ) , THREAD_BLOCKED_CLIENT ); 
357            sched_yield("clients queue empty");
358
359#if DEBUG_CHDEV_SERVER_RX
360rx_cycle = (uint32_t)hal_get_cycles();
361if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
362printk("\n[%s] RX server thread[%x,%x] resumes / cycle %d\n",
363__FUNCTION__ , server->process->pid, server->trdid, rx_cycle );
364#endif
365
366#if DEBUG_CHDEV_SERVER_TX
367tx_cycle = (uint32_t)hal_get_cycles();
368if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
369printk("\n[%s] TX server thread[%x,%x] resumes / cycle %d\n",
370__FUNCTION__ , server->process->pid, server->trdid, tx_cycle );
371#endif
372
373        } 
374        else                                               // waiting queue not empty
375        {
376            // get pointers on first client thread
377            client_xp  = XLIST_FIRST( root_xp , thread_t , wait_list );
378            client_cxy = GET_CXY( client_xp );
379            client_ptr = GET_PTR( client_xp );
380
381            // remove this client thread from chdev waiting queue
382            xlist_unlink( XPTR( client_cxy , &client_ptr->wait_list ) );
383
384            // release lock protecting the waiting queue
385            remote_busylock_release( lock_xp );
386
387#if( DEBUG_CHDEV_SERVER_TX || DEBUG_CHDEV_SERVER_RX )
388process_t * process      = hal_remote_lpt( XPTR( client_cxy , &client_ptr->process ) );
389pid_t       client_pid   = hal_remote_l32( XPTR( client_cxy , &process->pid ) );
390trdid_t     client_trdid = hal_remote_l32( XPTR( client_cxy , &client_ptr->trdid ) );
391#endif
392
393#if DEBUG_CHDEV_SERVER_RX
394rx_cycle = (uint32_t)hal_get_cycles();
395if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
396printk("\n[%s] server thread[%x,%x] get command from client thread[%x,%x] / cycle %d\n",
397__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, rx_cycle );
398#endif
399
400#if DEBUG_CHDEV_SERVER_TX
401tx_cycle = (uint32_t)hal_get_cycles();
402if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
403printk("\n[%s] server thread[%x,%x] get command from client thread[%x,%x] / cycle %d\n",
404__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, tx_cycle );
405#endif
406
407#if (DEBUG_SYS_READ & 1)
408enter_chdev_server_read = (uint32_t)hal_get_cycles();
409#endif
410
411#if (DEBUG_SYS_WRITE & 1)
412enter_chdev_server_write = (uint32_t)hal_get_cycles();
413#endif
414
415            // call the (blocking) driver command function
416            // to launch I/O operation AND wait completion
417            chdev->cmd( client_xp );
418       
419            // unblock client thread when driver returns
420            thread_unblock( client_xp , THREAD_BLOCKED_IO );
421
422#if DEBUG_CHDEV_SERVER_RX
423rx_cycle = (uint32_t)hal_get_cycles();
424if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
425printk("\n[%s] thread[%x,%x] completes command for client thread[%x,%x] / cycle %d\n",
426__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, rx_cycle );
427#endif
428
429#if DEBUG_CHDEV_SERVER_TX
430tx_cycle = (uint32_t)hal_get_cycles();
431if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
432printk("\n[%s] thread[%x,%x] completes command for client thread[%x,%x] / cycle %d\n",
433__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, tx_cycle );
434#endif
435
436#if (DEBUG_SYS_READ & 1)
437exit_chdev_server_read = (uint32_t)hal_get_cycles();
438#endif
439
440#if (DEBUG_SYS_WRITE & 1)
441exit_chdev_server_write = (uint32_t)hal_get_cycles();
442#endif
443
444        }
445    }  // end while
446}  // end chdev_server_func()
447
448////////////////////////////////////////
449xptr_t chdev_from_file( xptr_t file_xp )
450{
451    cxy_t         file_cxy;
452    vfs_file_t  * file_ptr;
453    uint32_t      inode_type;
454    vfs_inode_t * inode_ptr;
455    chdev_t     * chdev_ptr;
456
457assert( __FUNCTION__, (file_xp != XPTR_NULL) ,
458"file_xp == XPTR_NULL" );
459
460    // get cluster and local pointer on remote file descriptor
461    // associated inode and chdev are stored in same cluster as the file desc.
462    file_cxy  = GET_CXY( file_xp );
463    file_ptr  = (vfs_file_t *)GET_PTR( file_xp );
464
465    // get inode type from file descriptor
466    inode_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) );
467    inode_ptr  = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
468
469assert( __FUNCTION__, (inode_type == FILE_TYPE_DEV) ,
470"inode type %d is not FILE_TYPE_DEV", inode_type );
471
472    // get chdev local pointer from inode extension
473    chdev_ptr = (chdev_t *)hal_remote_lpt( XPTR( file_cxy , &inode_ptr->extend ) );
474
475    return XPTR( file_cxy , chdev_ptr );
476
477}  // end chdev_from_file()
478
479//////////////////////////////
480void chdev_dir_display( void )
481{
482    uint32_t  i;
483    cxy_t     cxy;
484    chdev_t * ptr;
485    uint32_t  base;
486
487    // get pointers on TXT0 chdev
488    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
489    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
490    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
491
492    // get extended pointer on TXT0 lock
493    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
494
495    // get TXT0 lock
496    remote_busylock_acquire( lock_xp );
497
498    // header
499    nolock_printk("\n***** external chdevs directory *****\n");
500
501    // IOB
502    if (chdev_dir.iob != XPTR_NULL )
503    {
504        cxy  = GET_CXY( chdev_dir.iob );
505        ptr  = GET_PTR( chdev_dir.iob );
506        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
507        nolock_printk("  - iob       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
508    }
509
510    // PIC
511    cxy  = GET_CXY( chdev_dir.pic );
512    ptr  = GET_PTR( chdev_dir.pic );
513    base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
514    nolock_printk("  - pic       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
515
516    // TXT
517    for( i = 0 ; i < LOCAL_CLUSTER->nb_txt_channels ; i++ )
518    {
519        cxy = GET_CXY( chdev_dir.txt_rx[i] );
520        ptr = GET_PTR( chdev_dir.txt_rx[i] );
521        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
522        nolock_printk("  - txt_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
523
524        cxy = GET_CXY( chdev_dir.txt_tx[i] );
525        ptr = GET_PTR( chdev_dir.txt_tx[i] );
526        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
527        nolock_printk("  - txt_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
528    }
529
530    // IOC
531    for( i = 0 ; i < LOCAL_CLUSTER->nb_ioc_channels ; i++ )
532    {
533        cxy = GET_CXY( chdev_dir.ioc[i] );
534        ptr = GET_PTR( chdev_dir.ioc[i] );
535        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
536        nolock_printk("  - ioc[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
537    }
538
539    // FBF
540    for( i = 0 ; i < LOCAL_CLUSTER->nb_fbf_channels ; i++ )
541    {
542        cxy  = GET_CXY( chdev_dir.fbf[i] );
543        ptr  = GET_PTR( chdev_dir.fbf[i] );
544        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
545        nolock_printk("  - fbf[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
546    }
547
548    // NIC
549    for( i = 0 ; i < LOCAL_CLUSTER->nb_nic_channels ; i++ )
550    {
551        cxy = GET_CXY( chdev_dir.nic_rx[i] );
552        ptr = GET_PTR( chdev_dir.nic_rx[i] );
553        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
554        nolock_printk("  - nic_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
555
556        cxy = GET_CXY( chdev_dir.nic_tx[i] );
557        ptr = GET_PTR( chdev_dir.nic_tx[i] );
558        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
559        nolock_printk("  - nic_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
560    }
561
562    // release lock
563    remote_busylock_release( lock_xp );
564
565}  // end chdev_dir_display()
566
567///////////////////////////////////////////
568void chdev_queue_display( xptr_t chdev_xp )
569{
570    cxy_t       chdev_cxy;          // chdev cluster
571    chdev_t   * chdev_ptr;          // chdev local pointer
572    xptr_t      root_xp;            // extended pointer on waiting queuue root
573    char        name[16];           // local copie of chdev name
574    xptr_t      iter_xp;            // extended pointer on xlist_t field in waiting thread
575    xptr_t      thread_xp;          // extended pointer on thread registered in queue
576    cxy_t       thread_cxy;         // cluster identifier for waiting thread
577    thread_t  * thread_ptr;         // local pointer on waiting thread
578    trdid_t     trdid;              // waiting thread identifier
579    process_t * process;            // waiting thread process descriptor
580    pid_t       pid;                // waiting thread process identifier
581
582    // get cluster and local pointer on chdev
583    chdev_cxy = GET_CXY( chdev_xp );
584    chdev_ptr = GET_PTR( chdev_xp );
585
586    // get extended pointer on root of requests queue
587    root_xp = XPTR( chdev_cxy , &chdev_ptr->wait_root );
588
589    // get chdev name
590    hal_remote_strcpy( XPTR( local_cxy , name ), XPTR( chdev_cxy , chdev_ptr->name ) );
591
592    // get pointers on TXT0 chdev
593    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
594    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
595    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
596
597    // get extended pointer on TXT0 lock
598    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
599
600    // get TXT0 lock
601    remote_busylock_acquire( lock_xp );
602
603    // check queue empty
604    if( xlist_is_empty( root_xp ) )
605    {
606        nolock_printk("\n***** Waiting queue empty for chdev %s\n", name ); 
607    }
608    else
609    {
610        nolock_printk("\n***** Waiting queue for chdev %s\n", name ); 
611
612        // scan the waiting queue
613        XLIST_FOREACH( root_xp , iter_xp )
614        {
615            thread_xp  = XLIST_ELEMENT( iter_xp , thread_t , wait_list );
616            thread_cxy = GET_CXY( thread_xp );
617            thread_ptr = GET_PTR( thread_xp );
618            trdid      = hal_remote_l32 ( XPTR( thread_cxy , &thread_ptr->trdid   ) );
619            process    = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->process ) );
620                        pid        = hal_remote_l32 ( XPTR( thread_cxy , &process->pid        ) );
621
622            nolock_printk("- thread[%x,%x]\n", pid, trdid );
623        }
624    }
625
626    // release TXT0 lock
627    remote_busylock_release( lock_xp );
628
629}  // end chdev_queue_display()
630
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