source: trunk/kernel/kern/chdev.c @ 590

Last change on this file since 590 was 583, checked in by alain, 5 years ago

Improve signals.
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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_DEVICE;
93    req.flags  = AF_ZERO;
94    chdev      = (chdev_t *)kmem_alloc( &req );
95
96    if( chdev == NULL ) return NULL;
97
98    // initialize lock
99    remote_busylock_init( XPTR( local_cxy , &chdev->wait_lock ), LOCK_CHDEV_QUEUE );
100
101    // initialise waiting queue
102    xlist_root_init( XPTR( local_cxy , &chdev->wait_root ) );
103
104    // initialize attributes
105    chdev->func    =  func;
106    chdev->impl    =  impl;
107    chdev->channel =  channel;
108    chdev->is_rx   =  is_rx;
109    chdev->base    =  base; 
110
111    return chdev;
112
113}  // end chdev_create()
114
115///////////////////////////////////
116void chdev_print( chdev_t * chdev )
117{
118    printk("\n - func      = %s"
119           "\n - channel   = %d"
120           "\n - base      = %l"
121           "\n - cmd       = %x"
122           "\n - isr       = %x"
123           "\n - chdev     = %x\n",
124           chdev_func_str(chdev->func),
125           chdev->channel,
126           chdev->base,
127           chdev->cmd,
128           chdev->isr,
129           chdev );
130}
131
132//////////////////////////////////////////////////
133void chdev_register_command( xptr_t     chdev_xp )
134{
135    thread_t * server_ptr;    // local pointer on server thread associated to chdev
136    xptr_t     server_xp;     // extended pointer on server thread
137    core_t   * core_ptr;      // local pointer on core running the server thread
138    uint32_t   server_lid;    // core running the server thread local index
139    xptr_t     lock_xp;       // extended pointer on lock protecting the chdev state
140    uint32_t   save_sr;       // for critical section
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 ) );
171#endif
172   
173#if DEBUG_CHDEV_CMD_RX
174uint32_t rx_cycle = (uint32_t)hal_get_cycles();
175if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
176printk("\n[DBG] %s : client_thread %x (%s) enter for RX / server = %x / cycle %d\n",
177__FUNCTION__, this, thread_type_str(this->type) , server_ptr, rx_cycle );
178#endif
179
180#if DEBUG_CHDEV_CMD_TX
181uint32_t tx_cycle = (uint32_t)hal_get_cycles();
182if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
183printk("\n[DBG] %s : client_thread %x (%s) enter for TX / server = %x / cycle %d\n",
184__FUNCTION__, this, thread_type_str(this->type) , server_ptr, tx_cycle );
185#endif
186
187    // build extended pointer on client thread xlist
188    xptr_t  list_xp    = XPTR( local_cxy , &this->wait_list );
189
190    // build extended pointer on chdev waiting queue root
191    xptr_t  root_xp    = XPTR( chdev_cxy , &chdev_ptr->wait_root );
192
193    // build extended pointer on server thread blocked state
194    xptr_t  blocked_xp = XPTR( chdev_cxy , &server_ptr->blocked );
195
196    // build extended pointer on lock protecting chdev waiting queue
197    lock_xp            = XPTR( chdev_cxy , &chdev_ptr->wait_lock );
198
199    // TODO the hal_disable_irq() / hal_restore_irq()
200    // in the sequence below is probably useless, as it is
201    // already done by the busylock_acquire() / busylock_release()
202    // => remove it [AG] october 2018
203
204    // critical section for the following sequence:
205    // (1) take the lock protecting the chdev state
206    // (2) block the client thread
207    // (3) unblock the server thread if required
208    // (4) register client thread in server queue
209    // (5) send IPI to force server scheduling
210    // (6) release the lock protecting waiting queue
211    // (7) deschedule
212
213    // enter critical section
214    hal_disable_irq( &save_sr );
215
216    // take the lock protecting chdev queue
217    remote_busylock_acquire( lock_xp );
218
219    // block current thread
220    thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_IO );
221
222#if (DEBUG_CHDEV_CMD_TX & 1)
223if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
224printk("\n[DBG] in %s : client thread %x blocked\n", __FUNCTION__, this );
225#endif
226
227#if (DEBUG_CHDEV_CMD_RX & 1)
228if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
229printk("\n[DBG] in %s : client thread %x blocked\n", __FUNCTION__, this );
230#endif
231
232    // unblock server thread if required
233    if( hal_remote_l32( blocked_xp ) & THREAD_BLOCKED_IDLE )
234    thread_unblock( server_xp , THREAD_BLOCKED_IDLE );
235
236#if (DEBUG_CHDEV_CMD_TX & 1)
237if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
238printk("\n[DBG] in %s : TX server thread %x unblocked\n", __FUNCTION__, server_ptr );
239#endif
240
241#if (DEBUG_CHDEV_CMD_RX & 1)
242if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
243printk("\n[DBG] in %s : RX server thread %x unblocked\n", __FUNCTION__, server_ptr );
244#endif
245
246    // register client thread in waiting queue
247    xlist_add_last( root_xp , list_xp );
248
249#if (DEBUG_CHDEV_CMD_TX & 1)
250if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
251printk("\n[DBG] in %s : thread %x registered write request in chdev\n", __FUNCTION__, this );
252#endif
253 
254#if (DEBUG_CHDEV_CMD_RX & 1)
255if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
256printk("\n[DBG] in %s : thread %x registered read request in chdev\n", __FUNCTION__, this );
257#endif
258 
259    // send IPI to core running the server thread when server core != client core
260    if( (server_lid != this->core->lid) || (local_cxy != chdev_cxy) )
261    {
262        dev_pic_send_ipi( chdev_cxy , server_lid ); 
263
264#if (DEBUG_CHDEV_CMD_TX & 1)
265if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
266printk("\n[DBG] in %s : client thread %x sent IPI to TX server thread %x\n",
267__FUNCTION__, this, server_ptr );
268#endif
269
270#if (DEBUG_CHDEV_CMD_RX & 1)
271if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
272printk("\n[DBG] in %s : client thread %x sent IPI to RX server thread %x\n",
273__FUNCTION__, this, server_ptr );
274#endif
275
276    }
277 
278    // release lock protecting chdev queue
279    remote_busylock_release( lock_xp );
280
281    // deschedule
282    sched_yield("blocked on I/O");
283
284    // exit critical section
285    hal_restore_irq( save_sr );
286
287#if DEBUG_CHDEV_CMD_RX
288rx_cycle = (uint32_t)hal_get_cycles();
289if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
290printk("\n[DBG] %s : client_thread %x (%s) exit for RX / cycle %d\n",
291__FUNCTION__, this, thread_type_str(this->type) , rx_cycle );
292#endif
293
294#if DEBUG_CHDEV_CMD_TX
295tx_cycle = (uint32_t)hal_get_cycles();
296if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
297printk("\n[DBG] %s : client_thread %x (%s) exit for TX / cycle %d\n",
298__FUNCTION__, this, thread_type_str(this->type) , tx_cycle );
299#endif
300
301#if (DEBUG_SYS_READ & 1)
302exit_chdev_cmd_read = (uint32_t)hal_get_cycles();
303#endif
304
305#if (DEBUG_SYS_WRITE & 1)
306exit_chdev_cmd_write = (uint32_t)hal_get_cycles();
307#endif
308
309}  // end chdev_register_command()
310
311///////////////////////////////////////////////
312void chdev_sequencial_server( chdev_t * chdev )
313{
314    xptr_t          client_xp;    // extended pointer on waiting thread
315    cxy_t           client_cxy;   // cluster of client thread
316    thread_t      * client_ptr;   // local pointer on client thread
317    thread_t      * server;       // local pointer on server thread
318    xptr_t          root_xp;      // extended pointer on device waiting queue root
319    xptr_t          lock_xp;      // extended pointer on lock ptotecting chdev queue
320
321    server = CURRENT_THREAD;
322
323    // build extended pointer on root of client threads queue
324    root_xp = XPTR( local_cxy , &chdev->wait_root );
325
326    // build extended pointer on lock protecting client threads queue
327    lock_xp = XPTR( local_cxy , &chdev->wait_lock );
328
329        // This infinite loop is executed by the DEV thread
330    // to handle commands registered in the chdev queue.
331    while( 1 )
332    {
333
334#if DEBUG_CHDEV_SERVER_RX
335uint32_t rx_cycle = (uint32_t)hal_get_cycles();
336if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
337printk("\n[DBG] %s : dev_thread %x start RX / cycle %d\n",
338__FUNCTION__ , server->trdid , rx_cycle );
339#endif
340
341#if DEBUG_CHDEV_SERVER_TX
342uint32_t tx_cycle = (uint32_t)hal_get_cycles();
343if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
344printk("\n[DBG] %s : dev_thread %x start TX / cycle %d\n",
345__FUNCTION__ , server->trdid , tx_cycle );
346#endif
347
348        // get the lock protecting the waiting queue
349        remote_busylock_acquire( lock_xp );
350
351        // check waiting queue state
352        if( xlist_is_empty( root_xp ) ) // waiting queue empty
353        {
354
355#if DEBUG_CHDEV_SERVER_RX
356rx_cycle = (uint32_t)hal_get_cycles();
357if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
358printk("\n[DBG] %s : dev_thread %x found RX queue empty => blocks / cycle %d\n",
359__FUNCTION__ , server->trdid , rx_cycle );
360#endif
361
362#if DEBUG_CHDEV_SERVER_TX
363tx_cycle = (uint32_t)hal_get_cycles();
364if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
365printk("\n[DBG] %s : dev_thread %x found TX queue empty => blocks / cycle %d\n",
366__FUNCTION__ , server->trdid , tx_cycle );
367#endif
368
369            // release lock
370            remote_busylock_release( lock_xp );
371
372            // block
373            thread_block( XPTR( local_cxy , server ) , THREAD_BLOCKED_IDLE ); 
374
375// check server thread can yield
376assert( (server->busylocks == 0),
377"cannot yield : busylocks = %d\n", server->busylocks );
378
379            // deschedule
380            sched_yield("I/O queue empty");
381        } 
382        else                            // waiting queue not empty
383        {
384            // get extended pointer on first client thread
385            client_xp = XLIST_FIRST( root_xp , thread_t , wait_list );
386
387            // get client thread cluster and local pointer
388            client_cxy = GET_CXY( client_xp );
389            client_ptr = GET_PTR( client_xp );
390
391            // remove this first client thread from waiting queue
392            xlist_unlink( XPTR( client_cxy , &client_ptr->wait_list ) );
393
394            // release lock
395            remote_busylock_release( lock_xp );
396
397#if DEBUG_CHDEV_SERVER_RX
398rx_cycle = (uint32_t)hal_get_cycles();
399if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
400printk("\n[DBG] %s : dev_thread %x for RX found client thread %x in process %x / cycle %d\n",
401__FUNCTION__, server->trdid ,client_ptr->trdid ,client_ptr->process->pid, rx_cycle );
402#endif
403
404#if DEBUG_CHDEV_SERVER_TX
405tx_cycle = (uint32_t)hal_get_cycles();
406if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
407printk("\n[DBG] %s : dev_thread %x for TX found client thread %x in process %x / cycle %d\n",
408__FUNCTION__, server->trdid ,client_ptr->trdid ,client_ptr->process->pid, tx_cycle );
409#endif
410
411#if (DEBUG_SYS_READ & 1)
412enter_chdev_server_read = (uint32_t)hal_get_cycles();
413#endif
414
415#if (DEBUG_SYS_WRITE & 1)
416enter_chdev_server_write = (uint32_t)hal_get_cycles();
417#endif
418
419            // call driver command function to execute I/O operation
420            chdev->cmd( client_xp );
421       
422            // unblock client thread
423            thread_unblock( client_xp , THREAD_BLOCKED_IO );
424
425#if DEBUG_CHDEV_SERVER_RX
426rx_cycle = (uint32_t)hal_get_cycles();
427if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
428printk("\n[DBG] %s : dev_thread %x completes RX for client %x in process %x / cycle %d\n",
429__FUNCTION__, server->trdid, client_ptr->trdid, client_ptr->process->pid, rx_cycle );
430#endif
431
432#if DEBUG_CHDEV_SERVER_TX
433tx_cycle = (uint32_t)hal_get_cycles();
434if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
435printk("\n[DBG] %s : dev_thread %x completes TX for client %x in process %x / cycle %d\n",
436__FUNCTION__, server->trdid, client_ptr->trdid, client_ptr->process->pid, tx_cycle );
437#endif
438
439#if (DEBUG_SYS_READ & 1)
440exit_chdev_server_read = (uint32_t)hal_get_cycles();
441#endif
442
443#if (DEBUG_SYS_WRITE & 1)
444exit_chdev_server_write = (uint32_t)hal_get_cycles();
445#endif
446
447        }
448    }  // end while
449}  // end chdev_sequencial_server()
450
451////////////////////////////////////////
452xptr_t chdev_from_file( xptr_t file_xp )
453{
454    cxy_t         file_cxy;
455    vfs_file_t  * file_ptr;
456    uint32_t      inode_type;
457    vfs_inode_t * inode_ptr;
458    chdev_t     * chdev_ptr;
459
460    assert( (file_xp != XPTR_NULL) ,
461    "file_xp == XPTR_NULL\n" );
462
463    // get cluster and local pointer on remote file descriptor
464    // associated inode and chdev are stored in same cluster as the file desc.
465    file_cxy  = GET_CXY( file_xp );
466    file_ptr  = (vfs_file_t *)GET_PTR( file_xp );
467
468    // get inode type from file descriptor
469    inode_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) );
470    inode_ptr  = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
471
472    assert( (inode_type == INODE_TYPE_DEV) ,
473    "inode type %d is not INODE_TYPE_DEV\n", inode_type );
474
475    // get chdev local pointer from inode extension
476    chdev_ptr = (chdev_t *)hal_remote_lpt( XPTR( file_cxy , &inode_ptr->extend ) );
477
478    return XPTR( file_cxy , chdev_ptr );
479
480}  // end chdev_from_file()
481
482//////////////////////////////
483void chdev_dir_display( void )
484{
485    uint32_t  i;
486    cxy_t     cxy;
487    chdev_t * ptr;
488    uint32_t  base;
489
490    // get pointers on TXT0 chdev
491    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
492    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
493    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
494
495    // get extended pointer on TXT0 lock
496    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
497
498    // get TXT0 lock
499    remote_busylock_acquire( lock_xp );
500
501    // header
502    nolock_printk("\n***** external chdevs directory *****\n");
503
504    // IOB
505    if (chdev_dir.iob != XPTR_NULL )
506    {
507        cxy  = GET_CXY( chdev_dir.iob );
508        ptr  = GET_PTR( chdev_dir.iob );
509        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
510        nolock_printk("  - iob       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
511    }
512
513    // PIC
514    cxy  = GET_CXY( chdev_dir.pic );
515    ptr  = GET_PTR( chdev_dir.pic );
516    base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
517    nolock_printk("  - pic       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
518
519    // TXT
520    for( i = 0 ; i < LOCAL_CLUSTER->nb_txt_channels ; i++ )
521    {
522        cxy = GET_CXY( chdev_dir.txt_rx[i] );
523        ptr = GET_PTR( chdev_dir.txt_rx[i] );
524        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
525        nolock_printk("  - txt_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
526
527        cxy = GET_CXY( chdev_dir.txt_tx[i] );
528        ptr = GET_PTR( chdev_dir.txt_tx[i] );
529        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
530        nolock_printk("  - txt_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
531    }
532
533    // IOC
534    for( i = 0 ; i < LOCAL_CLUSTER->nb_ioc_channels ; i++ )
535    {
536        cxy = GET_CXY( chdev_dir.ioc[i] );
537        ptr = GET_PTR( chdev_dir.ioc[i] );
538        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
539        nolock_printk("  - ioc[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
540    }
541
542    // FBF
543    for( i = 0 ; i < LOCAL_CLUSTER->nb_fbf_channels ; i++ )
544    {
545        cxy  = GET_CXY( chdev_dir.fbf[i] );
546        ptr  = GET_PTR( chdev_dir.fbf[i] );
547        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
548        nolock_printk("  - fbf[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
549    }
550
551    // NIC
552    for( i = 0 ; i < LOCAL_CLUSTER->nb_nic_channels ; i++ )
553    {
554        cxy = GET_CXY( chdev_dir.nic_rx[i] );
555        ptr = GET_PTR( chdev_dir.nic_rx[i] );
556        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
557        nolock_printk("  - nic_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
558
559        cxy = GET_CXY( chdev_dir.nic_tx[i] );
560        ptr = GET_PTR( chdev_dir.nic_tx[i] );
561        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
562        nolock_printk("  - nic_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
563    }
564
565    // release lock
566    remote_busylock_release( lock_xp );
567
568}  // end chdev_dir_display()
569
570///////////////////////////////////////////
571void chdev_queue_display( xptr_t chdev_xp )
572{
573    cxy_t       chdev_cxy;          // chdev cluster
574    chdev_t   * chdev_ptr;          // chdev local pointer
575    xptr_t      root_xp;            // extended pointer on waiting queuue root
576    char        name[16];           // local copie of chdev name
577    xptr_t      iter_xp;            // extended pointer on xlist_t field in waiting thread
578    xptr_t      thread_xp;          // extended pointer on thread registered in queue
579    cxy_t       thread_cxy;         // cluster identifier for waiting thread
580    thread_t  * thread_ptr;         // local pointer on waiting thread
581    trdid_t     trdid;              // waiting thread identifier
582    process_t * process;            // waiting thread process descriptor
583    pid_t       pid;                // waiting thread process identifier
584
585    // get cluster and local pointer on chdev
586    chdev_cxy = GET_CXY( chdev_xp );
587    chdev_ptr = GET_PTR( chdev_xp );
588
589    // get extended pointer on root of requests queue
590    root_xp = XPTR( chdev_cxy , &chdev_ptr->wait_root );
591
592    // get chdev name
593    hal_remote_strcpy( XPTR( local_cxy , name ), XPTR( chdev_cxy , chdev_ptr->name ) );
594
595    // get pointers on TXT0 chdev
596    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
597    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
598    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
599
600    // get extended pointer on TXT0 lock
601    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
602
603    // get TXT0 lock
604    remote_busylock_acquire( lock_xp );
605
606    // check queue empty
607    if( xlist_is_empty( root_xp ) )
608    {
609        nolock_printk("\n***** Waiting queue empty for chdev %s\n", name ); 
610    }
611    else
612    {
613        nolock_printk("\n***** Waiting queue for chdev %s\n", name ); 
614
615        // scan the waiting queue
616        XLIST_FOREACH( root_xp , iter_xp )
617        {
618            thread_xp  = XLIST_ELEMENT( iter_xp , thread_t , wait_list );
619            thread_cxy = GET_CXY( thread_xp );
620            thread_ptr = GET_PTR( thread_xp );
621            trdid      = hal_remote_l32 ( XPTR( thread_cxy , &thread_ptr->trdid   ) );
622            process    = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->process ) );
623                        pid        = hal_remote_l32 ( XPTR( thread_cxy , &process->pid        ) );
624
625            nolock_printk("- thread %X / cluster %X / trdid %X / pid %X\n",
626            thread_ptr, thread_cxy, trdid, pid );
627        }
628    }
629
630    // release TXT0 lock
631    remote_busylock_release( lock_xp );
632
633}  // end chdev_queue_display()
634
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