source: trunk/kernel/kern/chdev.c @ 619

Last change on this file since 619 was 619, checked in by alain, 3 years ago

1) Fix a bug in KSH : after the "load" command,

the [ksh] prompt is now printed after completion
of the loaded application.

2) Fix a bug in vmm_handle_cow() : the copy-on-write

use now a hal_remote_memcpy() to replicate the page content.


File size: 22.4 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_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 ) );
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[%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[%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 server thread blocked state
197    xptr_t  blocked_xp = XPTR( chdev_cxy , &server_ptr->blocked );
198
199    // build extended pointer on lock protecting chdev waiting queue
200    lock_xp            = XPTR( chdev_cxy , &chdev_ptr->wait_lock );
201
202    // TODO the hal_disable_irq() / hal_restore_irq()
203    // in the sequence below is probably useless, as it is
204    // already done by the busylock_acquire() / busylock_release()
205    // => remove it [AG] october 2018
206
207    // critical section for the following sequence:
208    // (1) take the lock protecting the chdev state
209    // (2) block the client thread
210    // (3) unblock the server thread if required
211    // (4) register client thread in server queue
212    // (5) send IPI to force server scheduling
213    // (6) release the lock protecting waiting queue
214    // (7) deschedule
215
216    // enter critical section
217    hal_disable_irq( &save_sr );
218
219    // take the lock protecting chdev queue
220    remote_busylock_acquire( lock_xp );
221
222    // block current thread
223    thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_IO );
224
225#if (DEBUG_CHDEV_CMD_TX & 1)
226if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
227printk("\n[%s] client thread[%x,%x] blocked\n",
228__FUNCTION__, this->process->pid, this->trdid );
229#endif
230
231#if (DEBUG_CHDEV_CMD_RX & 1)
232if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
233printk("\n[%s] client thread[%x,%x] blocked\n",
234__FUNCTION__, this->process_pid, this->trdid );
235#endif
236
237    // unblock server thread if required
238    if( hal_remote_l32( blocked_xp ) & THREAD_BLOCKED_IDLE )
239    thread_unblock( server_xp , THREAD_BLOCKED_IDLE );
240
241#if (DEBUG_CHDEV_CMD_TX & 1)
242if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
243printk("\n[%s] TX server thread[%x,%x] unblocked\n",
244__FUNCTION__, server_pid, server_trdid );
245#endif
246
247#if (DEBUG_CHDEV_CMD_RX & 1)
248if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
249printk("\n[%s] RX server thread[%x,%x] unblocked\n",
250__FUNCTION__, server_pid, server_trdid );
251#endif
252
253    // register client thread in waiting queue
254    xlist_add_last( root_xp , list_xp );
255
256#if (DEBUG_CHDEV_CMD_TX & 1)
257if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
258printk("\n[%s] client thread[%x,%x] registered write request in chdev\n",
259__FUNCTION__, this->process->pid, this->trdid );
260#endif
261 
262#if (DEBUG_CHDEV_CMD_RX & 1)
263if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
264printk("\n[%s] client thread[%x,%x] registered read request in chdev\n",
265__FUNCTION__, this->process->pid, this->trdid );
266#endif
267 
268    // send IPI to core running the server thread when server core != client core
269    if( (server_lid != this->core->lid) || (local_cxy != chdev_cxy) )
270    {
271        dev_pic_send_ipi( chdev_cxy , server_lid ); 
272
273#if (DEBUG_CHDEV_CMD_TX & 1)
274if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
275printk("\n[%s] client thread[%x,%x] sent IPI to TX server thread[%x,%x]\n",
276__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid );
277#endif
278
279#if (DEBUG_CHDEV_CMD_RX & 1)
280if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
281printk("\n[%s] client thread[%x,%x] sent IPI to RX server thread[%x,%x]\n",
282__FUNCTION__, this->process->pid, this->trdid, server_pid, server_trdid );
283#endif
284
285    }
286 
287    // release lock protecting chdev queue
288    remote_busylock_release( lock_xp );
289
290    // deschedule
291    sched_yield("blocked on I/O");
292
293    // exit critical section
294    hal_restore_irq( save_sr );
295
296#if DEBUG_CHDEV_CMD_RX
297rx_cycle = (uint32_t)hal_get_cycles();
298if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
299printk("\n[%s] client_thread[%x,%x] exit for RX / cycle %d\n",
300__FUNCTION__, this->process->pid, this->trdid, rx_cycle );
301#endif
302
303#if DEBUG_CHDEV_CMD_TX
304tx_cycle = (uint32_t)hal_get_cycles();
305if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
306printk("\n[%s] client_thread[%x,%x] exit for TX / cycle %d\n",
307__FUNCTION__, this->process->pid, this->trdid, tx_cycle );
308#endif
309
310#if (DEBUG_SYS_READ & 1)
311exit_chdev_cmd_read = (uint32_t)hal_get_cycles();
312#endif
313
314#if (DEBUG_SYS_WRITE & 1)
315exit_chdev_cmd_write = (uint32_t)hal_get_cycles();
316#endif
317
318}  // end chdev_register_command()
319
320/////////////////////////////////////////
321void chdev_server_func( chdev_t * chdev )
322{
323    xptr_t          client_xp;    // extended pointer on waiting thread
324    cxy_t           client_cxy;   // cluster of client thread
325    thread_t      * client_ptr;   // local pointer on client thread
326    thread_t      * server;       // local pointer on server thread
327    xptr_t          root_xp;      // extended pointer on device waiting queue root
328    xptr_t          lock_xp;      // extended pointer on lock ptotecting chdev queue
329
330    server = CURRENT_THREAD;
331
332    // build extended pointer on root of client threads queue
333    root_xp = XPTR( local_cxy , &chdev->wait_root );
334
335    // build extended pointer on lock protecting client threads queue
336    lock_xp = XPTR( local_cxy , &chdev->wait_lock );
337
338        // This infinite loop is executed by the DEV thread
339    // to handle commands registered in the chdev queue.
340    while( 1 )
341    {
342
343#if( DEBUG_CHDEV_SERVER_RX || DEBUG_CHDEV_SERVER_TX )
344uint32_t rx_cycle = (uint32_t)hal_get_cycles();
345if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
346printk("\n[%s] DEV thread[%x,%x] check TXT_RX channel %d / cycle %d\n",
347__FUNCTION__ , server->process->pid, server->trdid, chdev->channel, rx_cycle );
348#endif
349
350#if DEBUG_CHDEV_SERVER_TX
351uint32_t tx_cycle = (uint32_t)hal_get_cycles();
352if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
353printk("\n[%s] thread[%x,%x] check TXT_TX channel %d / cycle %d\n",
354__FUNCTION__ , server->process->pid, server->trdid, chdev->channel, tx_cycle );
355#endif
356
357        // check server thread can yield
358        thread_assert_can_yield( server , __FUNCTION__ );
359
360        // get the lock protecting the waiting queue
361        remote_busylock_acquire( lock_xp );
362
363        // check waiting queue state
364        if( xlist_is_empty( root_xp ) ) // waiting queue empty
365        {
366            // release lock protecting the waiting queue
367            remote_busylock_release( lock_xp );
368
369#if DEBUG_CHDEV_SERVER_RX
370rx_cycle = (uint32_t)hal_get_cycles();
371if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
372printk("\n[%s] thread[%x,%x] found RX queue empty => blocks / cycle %d\n",
373__FUNCTION__ , server->process->pid, server->trdid, rx_cycle );
374#endif
375
376#if DEBUG_CHDEV_SERVER_TX
377tx_cycle = (uint32_t)hal_get_cycles();
378if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
379printk("\n[%s] thread[%x,%x] found TX queue empty => blocks / cycle %d\n",
380__FUNCTION__ , server->process->pid, server->trdid, tx_cycle );
381#endif
382            // block
383            thread_block( XPTR( local_cxy , server ) , THREAD_BLOCKED_IDLE ); 
384
385            // deschedule
386            sched_yield("I/O queue empty");
387        } 
388        else                            // waiting queue not empty
389        {
390            // release lock protecting the waiting queue
391            remote_busylock_release( lock_xp );
392
393            // get extended pointer on first client thread
394            client_xp = XLIST_FIRST( root_xp , thread_t , wait_list );
395
396            // get client thread cluster and local pointer
397            client_cxy = GET_CXY( client_xp );
398            client_ptr = GET_PTR( client_xp );
399
400#if( DEBUG_CHDEV_SERVER_TX || DEBUG_CHDEV_SERVER_RX )
401process_t * process      = hal_remote_lpt( XPTR( client_cxy , &client_ptr->process ) );
402pid_t       client_pid   = hal_remote_l32( XPTR( client_cxy , &process->pid ) );
403trdid_t     client_trdid = hal_remote_l32( XPTR( client_cxy , &client_ptr->trdid ) );
404#endif
405
406#if DEBUG_CHDEV_SERVER_RX
407rx_cycle = (uint32_t)hal_get_cycles();
408if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
409printk("\n[%s] thread[%x,%x] for RX get client thread[%x,%x] / cycle %d\n",
410__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, rx_cycle );
411#endif
412
413#if DEBUG_CHDEV_SERVER_TX
414tx_cycle = (uint32_t)hal_get_cycles();
415if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
416printk("\n[%s] thread[%x,%x] for TX get client thread[%x,%x] / cycle %d\n",
417__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, tx_cycle );
418#endif
419
420#if (DEBUG_SYS_READ & 1)
421enter_chdev_server_read = (uint32_t)hal_get_cycles();
422#endif
423
424#if (DEBUG_SYS_WRITE & 1)
425enter_chdev_server_write = (uint32_t)hal_get_cycles();
426#endif
427
428            // call the (blocking) driver command function
429            // to launch I/O operation AND wait completion
430            chdev->cmd( client_xp );
431       
432            // unblock client thread when driver returns
433            thread_unblock( client_xp , THREAD_BLOCKED_IO );
434
435            // get the lock protecting the waiting queue
436            remote_busylock_acquire( lock_xp );
437
438            // remove this client thread from chdev waiting queue
439            xlist_unlink( XPTR( client_cxy , &client_ptr->wait_list ) );
440
441            // release lock protecting the waiting queue
442            remote_busylock_release( lock_xp );
443
444#if DEBUG_CHDEV_SERVER_RX
445rx_cycle = (uint32_t)hal_get_cycles();
446if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
447printk("\n[%s] thread[%x,%x] completes RX for client thread[%x,%x] / cycle %d\n",
448__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, rx_cycle );
449#endif
450
451#if DEBUG_CHDEV_SERVER_TX
452tx_cycle = (uint32_t)hal_get_cycles();
453if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
454printk("\n[%s] thread[%x,%x] completes TX for client thread[%x,%x] / cycle %d\n",
455__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, tX_cycle );
456#endif
457
458#if (DEBUG_SYS_READ & 1)
459exit_chdev_server_read = (uint32_t)hal_get_cycles();
460#endif
461
462#if (DEBUG_SYS_WRITE & 1)
463exit_chdev_server_write = (uint32_t)hal_get_cycles();
464#endif
465
466        }
467    }  // end while
468}  // end chdev_server_func()
469
470////////////////////////////////////////
471xptr_t chdev_from_file( xptr_t file_xp )
472{
473    cxy_t         file_cxy;
474    vfs_file_t  * file_ptr;
475    uint32_t      inode_type;
476    vfs_inode_t * inode_ptr;
477    chdev_t     * chdev_ptr;
478
479    assert( (file_xp != XPTR_NULL) ,
480    "file_xp == XPTR_NULL\n" );
481
482    // get cluster and local pointer on remote file descriptor
483    // associated inode and chdev are stored in same cluster as the file desc.
484    file_cxy  = GET_CXY( file_xp );
485    file_ptr  = (vfs_file_t *)GET_PTR( file_xp );
486
487    // get inode type from file descriptor
488    inode_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) );
489    inode_ptr  = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
490
491    assert( (inode_type == INODE_TYPE_DEV) ,
492    "inode type %d is not INODE_TYPE_DEV\n", inode_type );
493
494    // get chdev local pointer from inode extension
495    chdev_ptr = (chdev_t *)hal_remote_lpt( XPTR( file_cxy , &inode_ptr->extend ) );
496
497    return XPTR( file_cxy , chdev_ptr );
498
499}  // end chdev_from_file()
500
501//////////////////////////////
502void chdev_dir_display( void )
503{
504    uint32_t  i;
505    cxy_t     cxy;
506    chdev_t * ptr;
507    uint32_t  base;
508
509    // get pointers on TXT0 chdev
510    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
511    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
512    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
513
514    // get extended pointer on TXT0 lock
515    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
516
517    // get TXT0 lock
518    remote_busylock_acquire( lock_xp );
519
520    // header
521    nolock_printk("\n***** external chdevs directory *****\n");
522
523    // IOB
524    if (chdev_dir.iob != XPTR_NULL )
525    {
526        cxy  = GET_CXY( chdev_dir.iob );
527        ptr  = GET_PTR( chdev_dir.iob );
528        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
529        nolock_printk("  - iob       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
530    }
531
532    // PIC
533    cxy  = GET_CXY( chdev_dir.pic );
534    ptr  = GET_PTR( chdev_dir.pic );
535    base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
536    nolock_printk("  - pic       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
537
538    // TXT
539    for( i = 0 ; i < LOCAL_CLUSTER->nb_txt_channels ; i++ )
540    {
541        cxy = GET_CXY( chdev_dir.txt_rx[i] );
542        ptr = GET_PTR( chdev_dir.txt_rx[i] );
543        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
544        nolock_printk("  - txt_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
545
546        cxy = GET_CXY( chdev_dir.txt_tx[i] );
547        ptr = GET_PTR( chdev_dir.txt_tx[i] );
548        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
549        nolock_printk("  - txt_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
550    }
551
552    // IOC
553    for( i = 0 ; i < LOCAL_CLUSTER->nb_ioc_channels ; i++ )
554    {
555        cxy = GET_CXY( chdev_dir.ioc[i] );
556        ptr = GET_PTR( chdev_dir.ioc[i] );
557        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
558        nolock_printk("  - ioc[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
559    }
560
561    // FBF
562    for( i = 0 ; i < LOCAL_CLUSTER->nb_fbf_channels ; i++ )
563    {
564        cxy  = GET_CXY( chdev_dir.fbf[i] );
565        ptr  = GET_PTR( chdev_dir.fbf[i] );
566        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
567        nolock_printk("  - fbf[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
568    }
569
570    // NIC
571    for( i = 0 ; i < LOCAL_CLUSTER->nb_nic_channels ; i++ )
572    {
573        cxy = GET_CXY( chdev_dir.nic_rx[i] );
574        ptr = GET_PTR( chdev_dir.nic_rx[i] );
575        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
576        nolock_printk("  - nic_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
577
578        cxy = GET_CXY( chdev_dir.nic_tx[i] );
579        ptr = GET_PTR( chdev_dir.nic_tx[i] );
580        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
581        nolock_printk("  - nic_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
582    }
583
584    // release lock
585    remote_busylock_release( lock_xp );
586
587}  // end chdev_dir_display()
588
589///////////////////////////////////////////
590void chdev_queue_display( xptr_t chdev_xp )
591{
592    cxy_t       chdev_cxy;          // chdev cluster
593    chdev_t   * chdev_ptr;          // chdev local pointer
594    xptr_t      root_xp;            // extended pointer on waiting queuue root
595    char        name[16];           // local copie of chdev name
596    xptr_t      iter_xp;            // extended pointer on xlist_t field in waiting thread
597    xptr_t      thread_xp;          // extended pointer on thread registered in queue
598    cxy_t       thread_cxy;         // cluster identifier for waiting thread
599    thread_t  * thread_ptr;         // local pointer on waiting thread
600    trdid_t     trdid;              // waiting thread identifier
601    process_t * process;            // waiting thread process descriptor
602    pid_t       pid;                // waiting thread process identifier
603
604    // get cluster and local pointer on chdev
605    chdev_cxy = GET_CXY( chdev_xp );
606    chdev_ptr = GET_PTR( chdev_xp );
607
608    // get extended pointer on root of requests queue
609    root_xp = XPTR( chdev_cxy , &chdev_ptr->wait_root );
610
611    // get chdev name
612    hal_remote_strcpy( XPTR( local_cxy , name ), XPTR( chdev_cxy , chdev_ptr->name ) );
613
614    // get pointers on TXT0 chdev
615    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
616    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
617    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
618
619    // get extended pointer on TXT0 lock
620    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
621
622    // get TXT0 lock
623    remote_busylock_acquire( lock_xp );
624
625    // check queue empty
626    if( xlist_is_empty( root_xp ) )
627    {
628        nolock_printk("\n***** Waiting queue empty for chdev %s\n", name ); 
629    }
630    else
631    {
632        nolock_printk("\n***** Waiting queue for chdev %s\n", name ); 
633
634        // scan the waiting queue
635        XLIST_FOREACH( root_xp , iter_xp )
636        {
637            thread_xp  = XLIST_ELEMENT( iter_xp , thread_t , wait_list );
638            thread_cxy = GET_CXY( thread_xp );
639            thread_ptr = GET_PTR( thread_xp );
640            trdid      = hal_remote_l32 ( XPTR( thread_cxy , &thread_ptr->trdid   ) );
641            process    = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->process ) );
642                        pid        = hal_remote_l32 ( XPTR( thread_cxy , &process->pid        ) );
643
644            nolock_printk("- thread[%x,%x]\n", pid, trdid );
645        }
646    }
647
648    // release TXT0 lock
649    remote_busylock_release( lock_xp );
650
651}  // end chdev_queue_display()
652
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