source: trunk/kernel/kern/chdev.c @ 503

Last change on this file since 503 was 503, checked in by viala@…, 3 years ago

Add void type on function that takes no parameters, fix invalid call.

Fix invalid calls to thread_can_yield.

In file included from kern/chdev.c:29:
kern/chdev.c: In function 'chdev_sequencial_server':
kern/chdev.c:329:21: error: too many arguments to function 'thread_can_yield'

assert( thread_can_yield( server ) , "illegal sched_yield\n" );

~

Also fixed signature of mapper_create.

File size: 19.2 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
40extern chdev_directory_t    chdev_dir;   // allocated in kernel_init.c
41
42#if (DEBUG_SYS_READ & 1)
43extern uint32_t enter_chdev_cmd_read;
44extern uint32_t exit_chdev_cmd_read;
45extern uint32_t enter_chdev_server_read;
46extern uint32_t exit_chdev_server_read;
47#endif
48
49#if (DEBUG_SYS_WRITE & 1)
50extern uint32_t enter_chdev_cmd_write;
51extern uint32_t exit_chdev_cmd_write;
52extern uint32_t enter_chdev_server_write;
53extern uint32_t exit_chdev_server_write;
54#endif
55
56////////////////////////////////////////////
57char * chdev_func_str( uint32_t func_type ) 
58{
59        if     ( func_type == DEV_FUNC_RAM ) return "RAM";
60        else if( func_type == DEV_FUNC_ROM ) return "ROM";
61        else if( func_type == DEV_FUNC_FBF ) return "FBF";
62        else if( func_type == DEV_FUNC_IOB ) return "IOB";
63        else if( func_type == DEV_FUNC_IOC ) return "IOC";
64        else if( func_type == DEV_FUNC_MMC ) return "MMC";
65        else if( func_type == DEV_FUNC_DMA ) return "DMA";
66        else if( func_type == DEV_FUNC_NIC ) return "NIC";
67        else if( func_type == DEV_FUNC_TIM ) return "TIM";
68        else if( func_type == DEV_FUNC_TXT ) return "TXT";
69        else if( func_type == DEV_FUNC_ICU ) return "ICU";
70        else if( func_type == DEV_FUNC_PIC ) return "PIC";
71    else                                 return "undefined";
72}
73
74/////////////////////////////////////////
75chdev_t * chdev_create( uint32_t    func,
76                        uint32_t    impl,
77                        uint32_t    channel,
78                        uint32_t    is_rx,
79                        xptr_t      base )
80{
81    chdev_t    * chdev;
82    kmem_req_t   req;
83
84    // allocate memory for chdev
85    req.type   = KMEM_DEVICE;
86    req.flags  = AF_ZERO;
87    chdev      = (chdev_t *)kmem_alloc( &req );
88
89    if( chdev == NULL ) return NULL;
90
91    // initialize waiting threads queue and associated lock
92    remote_spinlock_init( XPTR( local_cxy , &chdev->wait_lock ) );
93    xlist_root_init( XPTR( local_cxy , &chdev->wait_root ) );
94
95    // initialize attributes
96    chdev->func    =  func;
97    chdev->impl    =  impl;
98    chdev->channel =  channel;
99    chdev->is_rx   =  is_rx;
100    chdev->base    =  base; 
101
102    return chdev;
103
104}  // end chdev_create()
105
106///////////////////////////////////
107void chdev_print( chdev_t * chdev )
108{
109    printk("\n - func      = %s"
110           "\n - channel   = %d"
111           "\n - base      = %l"
112           "\n - cmd       = %x"
113           "\n - isr       = %x"
114           "\n - chdev     = %x\n",
115           chdev_func_str(chdev->func),
116           chdev->channel,
117           chdev->base,
118           chdev->cmd,
119           chdev->isr,
120           chdev );
121}
122
123//////////////////////////////////////////////////
124void chdev_register_command( xptr_t     chdev_xp )
125{
126    thread_t * server_ptr;    // local pointer on server thread associated to chdev
127    xptr_t     server_xp;     // extended pointer on server thread
128    core_t   * core_ptr;      // local pointer on core running the server thread
129    uint32_t   server_lid;    // core running the server thread local index
130    xptr_t     lock_xp;       // extended pointer on lock protecting the chdev queue
131    uint32_t   save_sr;       // for critical section
132
133#if (DEBUG_SYS_READ & 1)
134enter_chdev_cmd_read = (uint32_t)hal_get_cycles();
135#endif
136
137#if (DEBUG_SYS_WRITE & 1)
138enter_chdev_cmd_write = (uint32_t)hal_get_cycles();
139#endif
140
141    thread_t * this = CURRENT_THREAD;
142
143    // get chdev cluster and local pointer
144    cxy_t     chdev_cxy = GET_CXY( chdev_xp );
145    chdev_t * chdev_ptr = GET_PTR( chdev_xp );
146
147    // get local and extended pointers on server thread
148    server_ptr = (thread_t *)hal_remote_lpt( XPTR( chdev_cxy , &chdev_ptr->server) );
149    server_xp  = XPTR( chdev_cxy , server_ptr );
150
151    // get local pointer on core running the server thread
152    core_ptr   = (core_t *)hal_remote_lpt( XPTR( chdev_cxy , &server_ptr->core ) );
153
154    // get server core local index
155    server_lid = hal_remote_lw( XPTR( chdev_cxy , &core_ptr->lid ) );
156
157#if (DEBUG_CHDEV_CMD_RX || DEBUG_CHDEV_CMD_TX)
158bool_t is_rx = hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->is_rx ) );
159#endif
160   
161#if DEBUG_CHDEV_CMD_RX
162uint32_t rx_cycle = (uint32_t)hal_get_cycles();
163if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
164printk("\n[DBG] %s : client_thread %x (%s) enter for RX / server = %x / cycle %d\n",
165__FUNCTION__, this, thread_type_str(this->type) , server_ptr, rx_cycle );
166#endif
167
168#if DEBUG_CHDEV_CMD_TX
169uint32_t tx_cycle = (uint32_t)hal_get_cycles();
170if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
171printk("\n[DBG] %s : client_thread %x (%s) enter for TX / server = %x / cycle %d\n",
172__FUNCTION__, this, thread_type_str(this->type) , server_ptr, tx_cycle );
173#endif
174
175    // build extended pointer on client thread xlist
176    xptr_t  list_xp    = XPTR( local_cxy , &this->wait_list );
177
178    // build extended pointer on chdev waiting queue root
179    xptr_t  root_xp    = XPTR( chdev_cxy , &chdev_ptr->wait_root );
180
181    // build extended pointer on server thread blocked state
182    xptr_t  blocked_xp = XPTR( chdev_cxy , &server_ptr->blocked );
183
184    // build extended pointer on lock protecting chdev waiting queue
185    lock_xp = XPTR( chdev_cxy , &chdev_ptr->wait_lock );
186
187    // critical section for the following sequence:
188    // (1) take the lock protecting waiting queue
189    // (2) block the client thread
190    // (3) unblock the server thread if required
191    // (4) register client thread in server queue
192    // (5) send IPI to force server scheduling
193    // (6) release the lock protecting waiting queue
194    // (7) deschedule
195    // ... in this order
196
197    // enter critical section
198    hal_disable_irq( &save_sr );
199
200    // take the lock protecting chdev waiting queue
201    remote_spinlock_lock( lock_xp );
202
203    // block current thread
204    thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_IO );
205
206#if (DEBUG_CHDEV_CMD_TX & 1)
207if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
208printk("\n[DBG] in %s : client thread %x blocked\n", __FUNCTION__, this );
209#endif
210
211#if (DEBUG_CHDEV_CMD_RX & 1)
212if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
213printk("\n[DBG] in %s : client thread %x blocked\n", __FUNCTION__, this );
214#endif
215
216    // unblock server thread if required
217    if( hal_remote_lw( blocked_xp ) & THREAD_BLOCKED_IDLE )
218    thread_unblock( server_xp , THREAD_BLOCKED_IDLE );
219
220#if (DEBUG_CHDEV_CMD_TX & 1)
221if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
222printk("\n[DBG] in %s : TX server thread %x unblocked\n", __FUNCTION__, server_ptr );
223#endif
224
225#if (DEBUG_CHDEV_CMD_RX & 1)
226if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
227printk("\n[DBG] in %s : RX server thread %x unblocked\n", __FUNCTION__, server_ptr );
228#endif
229
230    // register client thread in waiting queue
231    xlist_add_last( root_xp , list_xp );
232
233#if (DEBUG_CHDEV_CMD_TX & 1)
234if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
235printk("\n[DBG] in %s : thread %x registered write request in chdev\n", __FUNCTION__, this );
236#endif
237 
238#if (DEBUG_CHDEV_CMD_RX & 1)
239if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
240printk("\n[DBG] in %s : thread %x registered read request in chdev\n", __FUNCTION__, this );
241#endif
242 
243    // send IPI to core running the server thread when server != client
244    if( (server_lid != this->core->lid) || (local_cxy != chdev_cxy) )
245    {
246        dev_pic_send_ipi( chdev_cxy , server_lid ); 
247
248#if (DEBUG_CHDEV_CMD_TX & 1)
249if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
250printk("\n[DBG] in %s : client thread %x sent IPI to TX server thread %x\n",
251__FUNCTION__, this, server_ptr );
252#endif
253
254#if (DEBUG_CHDEV_CMD_RX & 1)
255if( (is_rx)  && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
256printk("\n[DBG] in %s : client thread %x sent IPI to RX server thread %x\n",
257__FUNCTION__, this, server_ptr );
258#endif
259
260    }
261 
262    // release lock
263    remote_spinlock_unlock( lock_xp );
264
265    // deschedule
266    assert( thread_can_yield() , "illegal sched_yield\n" );
267    sched_yield("blocked on I/O");
268
269    // exit critical section
270    hal_restore_irq( save_sr );
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[DBG] %s : client_thread %x (%s) exit for RX / cycle %d\n",
276__FUNCTION__, this, thread_type_str(this->type) , 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[DBG] %s : client_thread %x (%s) exit for TX / cycle %d\n",
283__FUNCTION__, this, thread_type_str(this->type) , 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_sequencial_server( 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    // get root and lock on command queue
309    root_xp = XPTR( local_cxy , &chdev->wait_root );
310    lock_xp = XPTR( local_cxy , &chdev->wait_lock );
311
312        // This infinite loop is executed by the DEV thread
313    // to handle commands registered in the chdev queue.
314    while( 1 )
315    {
316        // get the lock protecting the waiting queue
317        remote_spinlock_lock( lock_xp );
318
319        // check waiting queue state
320        if( xlist_is_empty( root_xp ) ) // waiting queue empty
321        {
322            // release lock
323            remote_spinlock_unlock( lock_xp );
324
325            // block
326            thread_block( XPTR( local_cxy , server ) , THREAD_BLOCKED_IDLE ); 
327
328            // deschedule
329            assert( thread_can_yield( server ) , "illegal sched_yield\n" );
330            sched_yield("I/O queue empty");
331        } 
332        else                            // waiting queue not empty
333        {
334            // get extended pointer on first client thread
335            client_xp = XLIST_FIRST_ELEMENT( root_xp , thread_t , wait_list );
336
337            // get client thread cluster and local pointer
338            client_cxy = GET_CXY( client_xp );
339            client_ptr = GET_PTR( client_xp );
340
341            // remove this first client thread from waiting queue
342            xlist_unlink( XPTR( client_cxy , &client_ptr->wait_list ) );
343
344            // release lock
345            remote_spinlock_unlock( lock_xp );
346
347#if DEBUG_CHDEV_SERVER_RX
348uint32_t rx_cycle = (uint32_t)hal_get_cycles();
349if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
350printk("\n[DBG] %s : server_thread %x start RX / client %x / cycle %d\n",
351__FUNCTION__ , server , client_ptr , rx_cycle );
352#endif
353
354#if DEBUG_CHDEV_SERVER_TX
355uint32_t tx_cycle = (uint32_t)hal_get_cycles();
356if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
357printk("\n[DBG] %s : server_thread %x start TX / client %x / cycle %d\n",
358__FUNCTION__ , server , client_ptr , tx_cycle );
359#endif
360
361#if (DEBUG_SYS_READ & 1)
362enter_chdev_server_read = (uint32_t)hal_get_cycles();
363#endif
364
365#if (DEBUG_SYS_WRITE & 1)
366enter_chdev_server_write = (uint32_t)hal_get_cycles();
367#endif
368
369            // call driver command function to execute I/O operation
370            chdev->cmd( client_xp );
371       
372            // unblock client thread
373            thread_unblock( client_xp , THREAD_BLOCKED_IO );
374
375#if DEBUG_CHDEV_SERVER_RX
376rx_cycle = (uint32_t)hal_get_cycles();
377if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
378printk("\n[DBG] %s : server_thread %x completes RX / client %x / cycle %d\n",
379__FUNCTION__ , server , client_ptr , rx_cycle );
380#endif
381
382#if DEBUG_CHDEV_SERVER_TX
383tx_cycle = (uint32_t)hal_get_cycles();
384if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
385printk("\n[DBG] %s : server_thread %x completes TX / client %x / cycle %d\n",
386__FUNCTION__ , server , client_ptr , tx_cycle );
387#endif
388
389#if (DEBUG_SYS_READ & 1)
390exit_chdev_server_read = (uint32_t)hal_get_cycles();
391#endif
392
393#if (DEBUG_SYS_WRITE & 1)
394exit_chdev_server_write = (uint32_t)hal_get_cycles();
395#endif
396
397        }
398    }  // end while
399}  // end chdev_sequencial_server()
400
401////////////////////////////////////////
402xptr_t chdev_from_file( xptr_t file_xp )
403{
404    cxy_t         file_cxy;
405    vfs_file_t  * file_ptr;
406    uint32_t      inode_type;
407    vfs_inode_t * inode_ptr;
408    chdev_t     * chdev_ptr;
409
410    assert( (file_xp != XPTR_NULL) ,
411    "file_xp == XPTR_NULL\n" );
412
413    // get cluster and local pointer on remote file descriptor
414    // associated inode and chdev are stored in same cluster as the file desc.
415    file_cxy  = GET_CXY( file_xp );
416    file_ptr  = (vfs_file_t *)GET_PTR( file_xp );
417
418    // get inode type from file descriptor
419    inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) );
420    inode_ptr  = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
421
422    assert( (inode_type == INODE_TYPE_DEV) ,
423    "inode type %d is not INODE_TYPE_DEV\n", inode_type );
424
425    // get chdev local pointer from inode extension
426    chdev_ptr = (chdev_t *)hal_remote_lpt( XPTR( file_cxy , &inode_ptr->extend ) );
427
428    return XPTR( file_cxy , chdev_ptr );
429
430}  // end chdev_from_file()
431
432////////////////////////
433void chdev_dir_display( void )
434{
435    uint32_t  i;
436    cxy_t     cxy;
437    chdev_t * ptr;
438    uint32_t  base;
439    reg_t     save_sr;
440
441    // get pointers on TXT0 chdev
442    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
443    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
444    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
445
446    // get extended pointer on remote TXT0 chdev lock
447    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
448
449    // get TXT0 lock in busy waiting mode
450    remote_spinlock_lock_busy( lock_xp , &save_sr );
451
452    // header
453    nolock_printk("\n***** external chdevs directory *****\n");
454
455    // IOB
456    cxy  = GET_CXY( chdev_dir.iob );
457    ptr  = GET_PTR( chdev_dir.iob );
458    base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
459    nolock_printk("  - iob       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
460
461    // PIC
462    cxy  = GET_CXY( chdev_dir.pic );
463    ptr  = GET_PTR( chdev_dir.pic );
464    base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
465    nolock_printk("  - pic       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
466
467    // TXT
468    for( i = 0 ; i < LOCAL_CLUSTER->nb_txt_channels ; i++ )
469    {
470        cxy = GET_CXY( chdev_dir.txt_rx[i] );
471        ptr = GET_PTR( chdev_dir.txt_rx[i] );
472        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
473        nolock_printk("  - txt_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
474
475        cxy = GET_CXY( chdev_dir.txt_tx[i] );
476        ptr = GET_PTR( chdev_dir.txt_tx[i] );
477        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
478        nolock_printk("  - txt_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
479    }
480
481    // IOC
482    for( i = 0 ; i < LOCAL_CLUSTER->nb_ioc_channels ; i++ )
483    {
484        cxy = GET_CXY( chdev_dir.ioc[i] );
485        ptr = GET_PTR( chdev_dir.ioc[i] );
486        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
487        nolock_printk("  - ioc[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
488    }
489
490    // FBF
491    for( i = 0 ; i < LOCAL_CLUSTER->nb_fbf_channels ; i++ )
492    {
493        cxy  = GET_CXY( chdev_dir.fbf[i] );
494        ptr  = GET_PTR( chdev_dir.fbf[i] );
495        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
496        nolock_printk("  - fbf[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
497    }
498
499    // NIC
500    for( i = 0 ; i < LOCAL_CLUSTER->nb_nic_channels ; i++ )
501    {
502        cxy = GET_CXY( chdev_dir.nic_rx[i] );
503        ptr = GET_PTR( chdev_dir.nic_rx[i] );
504        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
505        nolock_printk("  - nic_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
506
507        cxy = GET_CXY( chdev_dir.nic_tx[i] );
508        ptr = GET_PTR( chdev_dir.nic_tx[i] );
509        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
510        nolock_printk("  - nic_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
511    }
512
513    // release lock
514    remote_spinlock_unlock_busy( lock_xp , save_sr );
515
516}  // end chdev_dir_display()
517
518///////////////////////////////////////////
519void chdev_queue_display( xptr_t chdev_xp )
520{
521    cxy_t       chdev_cxy;          // chdev cluster
522    chdev_t   * chdev_ptr;          // chdev local pointer
523    xptr_t      root_xp;            // extended pointer on waiting queuue root
524    char        name[16];           // local copie of chdev name
525    xptr_t      iter_xp;            // extended pointer on xlist_t field in waiting thread
526    xptr_t      thread_xp;          // extended pointer on thread registered in queue
527    cxy_t       thread_cxy;         // cluster identifier for waiting thread
528    thread_t  * thread_ptr;         // local pointer on waiting thread
529    trdid_t     trdid;              // waiting thread identifier
530    process_t * process;            // waiting thread process descriptor
531    pid_t       pid;                // waiting thread process identifier
532
533    // get cluster and local pointer on chdev
534    chdev_cxy = GET_CXY( chdev_xp );
535    chdev_ptr = GET_PTR( chdev_xp );
536
537    // get extended pointer on root of requests queue
538    root_xp = XPTR( chdev_cxy , &chdev_ptr->wait_root );
539
540    // get chdev name
541    hal_remote_strcpy( XPTR( local_cxy , name ), XPTR( chdev_cxy , chdev_ptr->name ) );
542
543    // check queue empty
544    if( xlist_is_empty( root_xp ) )
545    {
546        printk("\n***** Waiting queue empty for chdev %s\n", name ); 
547    }
548    else
549    {
550        printk("\n***** Waiting queue for chdev %s\n", name ); 
551
552        // scan the waiting queue
553        XLIST_FOREACH( root_xp , iter_xp )
554        {
555            thread_xp  = XLIST_ELEMENT( iter_xp , thread_t , wait_list );
556            thread_cxy = GET_CXY( thread_xp );
557            thread_ptr = GET_PTR( thread_xp );
558            trdid      = hal_remote_lw ( XPTR( thread_cxy , &thread_ptr->trdid   ) );
559            process    = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->process ) );
560                        pid        = hal_remote_lw ( XPTR( thread_cxy , &process->pid        ) );
561
562            printk("- thread %X / cluster %X / trdid %X / pid %X\n",
563            thread_ptr, thread_cxy, trdid, pid );
564        }
565    }
566}  // end chdev_queue_display()
567
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