source: trunk/kernel/kern/chdev.c @ 617

Last change on this file since 617 was 601, checked in by alain, 6 years ago

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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[%s] client[%x,%x] enter for RX / server[%x,%x] / cycle %d\n",
177__FUNCTION__, this->process->pid, this->trdid, 
178server_ptr->process->pid, server_ptr->trdid, rx_cycle );
179#endif
180
181#if DEBUG_CHDEV_CMD_TX
182uint32_t tx_cycle = (uint32_t)hal_get_cycles();
183if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
184printk("\n[%s] client[%x,%x] enter for TX / server[%x,%x] / cycle %d\n",
185__FUNCTION__, this->process->pid, this->trdid, 
186server_ptr->process->pid, server_ptr->trdid, tx_cycle );
187#endif
188
189    // build extended pointer on client thread xlist
190    xptr_t  list_xp    = XPTR( local_cxy , &this->wait_list );
191
192    // build extended pointer on chdev waiting queue root
193    xptr_t  root_xp    = XPTR( chdev_cxy , &chdev_ptr->wait_root );
194
195    // build extended pointer on server thread blocked state
196    xptr_t  blocked_xp = XPTR( chdev_cxy , &server_ptr->blocked );
197
198    // build extended pointer on lock protecting chdev waiting queue
199    lock_xp            = XPTR( chdev_cxy , &chdev_ptr->wait_lock );
200
201    // TODO the hal_disable_irq() / hal_restore_irq()
202    // in the sequence below is probably useless, as it is
203    // already done by the busylock_acquire() / busylock_release()
204    // => remove it [AG] october 2018
205
206    // critical section for the following sequence:
207    // (1) take the lock protecting the chdev state
208    // (2) block the client thread
209    // (3) unblock the server thread if required
210    // (4) register client thread in server queue
211    // (5) send IPI to force server scheduling
212    // (6) release the lock protecting waiting queue
213    // (7) deschedule
214
215    // enter critical section
216    hal_disable_irq( &save_sr );
217
218    // take the lock protecting chdev queue
219    remote_busylock_acquire( lock_xp );
220
221    // block current thread
222    thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_IO );
223
224#if (DEBUG_CHDEV_CMD_TX & 1)
225if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
226printk("\n[%s] client thread[%x,%x] blocked\n",
227__FUNCTION__, this->process->pid, this->trdid );
228#endif
229
230#if (DEBUG_CHDEV_CMD_RX & 1)
231if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
232printk("\n[%s] client thread[%x,%x] blocked\n",
233__FUNCTION__, this->process_pid, this->trdid );
234#endif
235
236    // unblock server thread if required
237    if( hal_remote_l32( blocked_xp ) & THREAD_BLOCKED_IDLE )
238    thread_unblock( server_xp , THREAD_BLOCKED_IDLE );
239
240#if (DEBUG_CHDEV_CMD_TX & 1)
241if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
242printk("\n[%s] TX server thread[%x,%x] unblocked\n",
243__FUNCTION__, server_ptr->process->pid, server_ptr->trdid );
244#endif
245
246#if (DEBUG_CHDEV_CMD_RX & 1)
247if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
248printk("\n[%s] RX server thread[%x,%x] unblocked\n",
249__FUNCTION__, server_ptr->process->pid, server_ptr->trdid );
250#endif
251
252    // register client thread in waiting queue
253    xlist_add_last( root_xp , list_xp );
254
255#if (DEBUG_CHDEV_CMD_TX & 1)
256if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
257printk("\n[%s] client thread[%x,%x] registered write request in chdev\n",
258__FUNCTION__, this->process->pid, this->trdid );
259#endif
260 
261#if (DEBUG_CHDEV_CMD_RX & 1)
262if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
263printk("\n[%s] client thread[%x,%x] registered read request in chdev\n",
264__FUNCTION__, this->process->pid, this->trdid );
265#endif
266 
267    // send IPI to core running the server thread when server core != client core
268    if( (server_lid != this->core->lid) || (local_cxy != chdev_cxy) )
269    {
270        dev_pic_send_ipi( chdev_cxy , server_lid ); 
271
272#if (DEBUG_CHDEV_CMD_TX & 1)
273if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
274printk("\n[%s] client thread[%x,%x] sent IPI to TX server thread[%x,%x]\n",
275__FUNCTION__, this->process->pid, this->trdid, server_ptr->process->pid, server_ptr->trdid );
276#endif
277
278#if (DEBUG_CHDEV_CMD_RX & 1)
279if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
280printk("\n[%s] client thread[%x,%x] sent IPI to RX server thread[%x,%x]\n",
281__FUNCTION__, this->process->pid, this->trdid, server_ptr->process->pid, server_ptr->trdid );
282#endif
283
284    }
285 
286    // release lock protecting chdev queue
287    remote_busylock_release( lock_xp );
288
289    // deschedule
290    sched_yield("blocked on I/O");
291
292    // exit critical section
293    hal_restore_irq( save_sr );
294
295#if DEBUG_CHDEV_CMD_RX
296rx_cycle = (uint32_t)hal_get_cycles();
297if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
298printk("\n[%s] client_thread[%x,%x] exit for RX / cycle %d\n",
299__FUNCTION__, this->process->pid, this->trdid, rx_cycle );
300#endif
301
302#if DEBUG_CHDEV_CMD_TX
303tx_cycle = (uint32_t)hal_get_cycles();
304if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
305printk("\n[%s] client_thread[%x,%x] exit for TX / cycle %d\n",
306__FUNCTION__, this->process->pid, this->trdid, tx_cycle );
307#endif
308
309#if (DEBUG_SYS_READ & 1)
310exit_chdev_cmd_read = (uint32_t)hal_get_cycles();
311#endif
312
313#if (DEBUG_SYS_WRITE & 1)
314exit_chdev_cmd_write = (uint32_t)hal_get_cycles();
315#endif
316
317}  // end chdev_register_command()
318
319///////////////////////////////////////////////
320void chdev_sequencial_server( chdev_t * chdev )
321{
322    xptr_t          client_xp;    // extended pointer on waiting thread
323    cxy_t           client_cxy;   // cluster of client thread
324    thread_t      * client_ptr;   // local pointer on client thread
325    thread_t      * server;       // local pointer on server thread
326    xptr_t          root_xp;      // extended pointer on device waiting queue root
327    xptr_t          lock_xp;      // extended pointer on lock ptotecting chdev queue
328
329    server = CURRENT_THREAD;
330
331    // build extended pointer on root of client threads queue
332    root_xp = XPTR( local_cxy , &chdev->wait_root );
333
334    // build extended pointer on lock protecting client threads queue
335    lock_xp = XPTR( local_cxy , &chdev->wait_lock );
336
337        // This infinite loop is executed by the DEV thread
338    // to handle commands registered in the chdev queue.
339    while( 1 )
340    {
341
342#if DEBUG_CHDEV_SERVER_RX
343uint32_t rx_cycle = (uint32_t)hal_get_cycles();
344if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
345printk("\n[%s] thread[%x,%x] start RX / cycle %d\n",
346__FUNCTION__ , server->process->pid, server->trdid, rx_cycle );
347#endif
348
349#if DEBUG_CHDEV_SERVER_TX
350uint32_t tx_cycle = (uint32_t)hal_get_cycles();
351if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
352printk("\n[%s] thread[%x,%x] start TX / cycle %d\n",
353__FUNCTION__ , server->process->pid, server->trdid, tx_cycle );
354#endif
355
356        // check server thread can yield
357        thread_assert_can_yield( server , __FUNCTION__ );
358
359        // get the lock protecting the waiting queue
360        remote_busylock_acquire( lock_xp );
361
362        // check waiting queue state
363        if( xlist_is_empty( root_xp ) ) // waiting queue empty
364        {
365            // release lock protecting the waiting queue
366            remote_busylock_release( lock_xp );
367
368#if DEBUG_CHDEV_SERVER_RX
369rx_cycle = (uint32_t)hal_get_cycles();
370if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
371printk("\n[%s] thread[%x,%x] found RX queue empty => blocks / cycle %d\n",
372__FUNCTION__ , server->process->pid, server->trdid, rx_cycle );
373#endif
374
375#if DEBUG_CHDEV_SERVER_TX
376tx_cycle = (uint32_t)hal_get_cycles();
377if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
378printk("\n[%s] thread[%x,%x] found TX queue empty => blocks / cycle %d\n",
379__FUNCTION__ , server->process->pid, server->trdid, tx_cycle );
380#endif
381            // block
382            thread_block( XPTR( local_cxy , server ) , THREAD_BLOCKED_IDLE ); 
383
384            // deschedule
385            sched_yield("I/O queue empty");
386        } 
387        else                            // waiting queue not empty
388        {
389            // release lock protecting the waiting queue
390            remote_busylock_release( lock_xp );
391
392            // get extended pointer on first client thread
393            client_xp = XLIST_FIRST( root_xp , thread_t , wait_list );
394
395            // get client thread cluster and local pointer
396            client_cxy = GET_CXY( client_xp );
397            client_ptr = GET_PTR( client_xp );
398
399#if( DDEBUG_CHDEV_SERVER_TX || DEBUG_CHDEV_SERVER_RX )
400process_t * process      = hal_remote_lpt( XPTR( client_cxy , &client_ptr->process ) );
401pid_t       client_pid   = hal_remote_l32( XPTR( client_cxy , &process->pid ) );
402process_t   client_trdid = hal_remote_l32( XPTR( client_cxy , &client_ptr->trdid ) );
403#endif
404
405#if DEBUG_CHDEV_SERVER_RX
406rx_cycle = (uint32_t)hal_get_cycles();
407if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
408printk("\n[%s] thread[%x,%x] for RX get client thread[%x,%x] / cycle %d\n",
409__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, cycle );
410#endif
411
412#if DEBUG_CHDEV_SERVER_TX
413tx_cycle = (uint32_t)hal_get_cycles();
414if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
415printk("\n[%s] thread[%x,%x] for TX get client thread[%x,%x] / cycle %d\n",
416__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, cycle );
417#endif
418
419#if (DEBUG_SYS_READ & 1)
420enter_chdev_server_read = (uint32_t)hal_get_cycles();
421#endif
422
423#if (DEBUG_SYS_WRITE & 1)
424enter_chdev_server_write = (uint32_t)hal_get_cycles();
425#endif
426
427            // call the (blocking) driver command function
428            // to launch I/O operation AND wait completion
429            chdev->cmd( client_xp );
430       
431            // unblock client thread when driver returns
432            thread_unblock( client_xp , THREAD_BLOCKED_IO );
433
434            // get the lock protecting the waiting queue
435            remote_busylock_acquire( lock_xp );
436
437            // remove this client thread from chdev waiting queue
438            xlist_unlink( XPTR( client_cxy , &client_ptr->wait_list ) );
439
440            // release lock protecting the waiting queue
441            remote_busylock_release( lock_xp );
442
443#if DEBUG_CHDEV_SERVER_RX
444rx_cycle = (uint32_t)hal_get_cycles();
445if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
446printk("\n[%s] thread[%x,%x] completes RX for client thread[%x,%x] / cycle %d\n",
447__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, cycle );
448#endif
449
450#if DEBUG_CHDEV_SERVER_TX
451tx_cycle = (uint32_t)hal_get_cycles();
452if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
453printk("\n[%s] thread[%x,%x] completes TX for client thread[%x,%x] / cycle %d\n",
454__FUNCTION__, server->process->pid, server->trdid, client_pid, client_trdid, cycle );
455#endif
456
457#if (DEBUG_SYS_READ & 1)
458exit_chdev_server_read = (uint32_t)hal_get_cycles();
459#endif
460
461#if (DEBUG_SYS_WRITE & 1)
462exit_chdev_server_write = (uint32_t)hal_get_cycles();
463#endif
464
465        }
466    }  // end while
467}  // end chdev_sequencial_server()
468
469////////////////////////////////////////
470xptr_t chdev_from_file( xptr_t file_xp )
471{
472    cxy_t         file_cxy;
473    vfs_file_t  * file_ptr;
474    uint32_t      inode_type;
475    vfs_inode_t * inode_ptr;
476    chdev_t     * chdev_ptr;
477
478    assert( (file_xp != XPTR_NULL) ,
479    "file_xp == XPTR_NULL\n" );
480
481    // get cluster and local pointer on remote file descriptor
482    // associated inode and chdev are stored in same cluster as the file desc.
483    file_cxy  = GET_CXY( file_xp );
484    file_ptr  = (vfs_file_t *)GET_PTR( file_xp );
485
486    // get inode type from file descriptor
487    inode_type = hal_remote_l32( XPTR( file_cxy , &file_ptr->type ) );
488    inode_ptr  = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
489
490    assert( (inode_type == INODE_TYPE_DEV) ,
491    "inode type %d is not INODE_TYPE_DEV\n", inode_type );
492
493    // get chdev local pointer from inode extension
494    chdev_ptr = (chdev_t *)hal_remote_lpt( XPTR( file_cxy , &inode_ptr->extend ) );
495
496    return XPTR( file_cxy , chdev_ptr );
497
498}  // end chdev_from_file()
499
500//////////////////////////////
501void chdev_dir_display( void )
502{
503    uint32_t  i;
504    cxy_t     cxy;
505    chdev_t * ptr;
506    uint32_t  base;
507
508    // get pointers on TXT0 chdev
509    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
510    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
511    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
512
513    // get extended pointer on TXT0 lock
514    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
515
516    // get TXT0 lock
517    remote_busylock_acquire( lock_xp );
518
519    // header
520    nolock_printk("\n***** external chdevs directory *****\n");
521
522    // IOB
523    if (chdev_dir.iob != XPTR_NULL )
524    {
525        cxy  = GET_CXY( chdev_dir.iob );
526        ptr  = GET_PTR( chdev_dir.iob );
527        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
528        nolock_printk("  - iob       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
529    }
530
531    // PIC
532    cxy  = GET_CXY( chdev_dir.pic );
533    ptr  = GET_PTR( chdev_dir.pic );
534    base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
535    nolock_printk("  - pic       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
536
537    // TXT
538    for( i = 0 ; i < LOCAL_CLUSTER->nb_txt_channels ; i++ )
539    {
540        cxy = GET_CXY( chdev_dir.txt_rx[i] );
541        ptr = GET_PTR( chdev_dir.txt_rx[i] );
542        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
543        nolock_printk("  - txt_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
544
545        cxy = GET_CXY( chdev_dir.txt_tx[i] );
546        ptr = GET_PTR( chdev_dir.txt_tx[i] );
547        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
548        nolock_printk("  - txt_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
549    }
550
551    // IOC
552    for( i = 0 ; i < LOCAL_CLUSTER->nb_ioc_channels ; i++ )
553    {
554        cxy = GET_CXY( chdev_dir.ioc[i] );
555        ptr = GET_PTR( chdev_dir.ioc[i] );
556        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
557        nolock_printk("  - ioc[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
558    }
559
560    // FBF
561    for( i = 0 ; i < LOCAL_CLUSTER->nb_fbf_channels ; i++ )
562    {
563        cxy  = GET_CXY( chdev_dir.fbf[i] );
564        ptr  = GET_PTR( chdev_dir.fbf[i] );
565        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
566        nolock_printk("  - fbf[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
567    }
568
569    // NIC
570    for( i = 0 ; i < LOCAL_CLUSTER->nb_nic_channels ; i++ )
571    {
572        cxy = GET_CXY( chdev_dir.nic_rx[i] );
573        ptr = GET_PTR( chdev_dir.nic_rx[i] );
574        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
575        nolock_printk("  - nic_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
576
577        cxy = GET_CXY( chdev_dir.nic_tx[i] );
578        ptr = GET_PTR( chdev_dir.nic_tx[i] );
579        base = (uint32_t)hal_remote_l64( XPTR( cxy , &ptr->base ) );
580        nolock_printk("  - nic_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
581    }
582
583    // release lock
584    remote_busylock_release( lock_xp );
585
586}  // end chdev_dir_display()
587
588///////////////////////////////////////////
589void chdev_queue_display( xptr_t chdev_xp )
590{
591    cxy_t       chdev_cxy;          // chdev cluster
592    chdev_t   * chdev_ptr;          // chdev local pointer
593    xptr_t      root_xp;            // extended pointer on waiting queuue root
594    char        name[16];           // local copie of chdev name
595    xptr_t      iter_xp;            // extended pointer on xlist_t field in waiting thread
596    xptr_t      thread_xp;          // extended pointer on thread registered in queue
597    cxy_t       thread_cxy;         // cluster identifier for waiting thread
598    thread_t  * thread_ptr;         // local pointer on waiting thread
599    trdid_t     trdid;              // waiting thread identifier
600    process_t * process;            // waiting thread process descriptor
601    pid_t       pid;                // waiting thread process identifier
602
603    // get cluster and local pointer on chdev
604    chdev_cxy = GET_CXY( chdev_xp );
605    chdev_ptr = GET_PTR( chdev_xp );
606
607    // get extended pointer on root of requests queue
608    root_xp = XPTR( chdev_cxy , &chdev_ptr->wait_root );
609
610    // get chdev name
611    hal_remote_strcpy( XPTR( local_cxy , name ), XPTR( chdev_cxy , chdev_ptr->name ) );
612
613    // get pointers on TXT0 chdev
614    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
615    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
616    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
617
618    // get extended pointer on TXT0 lock
619    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
620
621    // get TXT0 lock
622    remote_busylock_acquire( lock_xp );
623
624    // check queue empty
625    if( xlist_is_empty( root_xp ) )
626    {
627        nolock_printk("\n***** Waiting queue empty for chdev %s\n", name ); 
628    }
629    else
630    {
631        nolock_printk("\n***** Waiting queue for chdev %s\n", name ); 
632
633        // scan the waiting queue
634        XLIST_FOREACH( root_xp , iter_xp )
635        {
636            thread_xp  = XLIST_ELEMENT( iter_xp , thread_t , wait_list );
637            thread_cxy = GET_CXY( thread_xp );
638            thread_ptr = GET_PTR( thread_xp );
639            trdid      = hal_remote_l32 ( XPTR( thread_cxy , &thread_ptr->trdid   ) );
640            process    = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->process ) );
641                        pid        = hal_remote_l32 ( XPTR( thread_cxy , &process->pid        ) );
642
643            nolock_printk("- thread[%x,%x]\n", pid, trdid );
644        }
645    }
646
647    // release TXT0 lock
648    remote_busylock_release( lock_xp );
649
650}  // end chdev_queue_display()
651
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