source: trunk/kernel/kern/chdev.c @ 450

Last change on this file since 450 was 450, checked in by alain, 4 years ago

Fix a bug in function sched_handle_signal():
When the deleted user thread is the last executed thread,
the sched->u_last field must be updated to point on another user thread.

File size: 18.8 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_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   lid;           // core running the server thread local index
130    xptr_t     lock_xp;       // extended pointer on lock protecting the chdev queue
131    uint32_t   different;     // non zero if server thread core != client thread core
132    uint32_t   save_sr;       // for critical section
133
134#if (DEBUG_SYS_READ & 1)
135enter_chdev_cmd_read = (uint32_t)hal_get_cycles();
136#endif
137
138#if (DEBUG_SYS_WRITE & 1)
139enter_chdev_cmd_write = (uint32_t)hal_get_cycles();
140#endif
141
142    thread_t * this = CURRENT_THREAD;
143
144    // get chdev cluster and local pointer
145    cxy_t     chdev_cxy = GET_CXY( chdev_xp );
146    chdev_t * chdev_ptr = GET_PTR( chdev_xp );
147
148    // get local and extended pointers on server thread
149    server_ptr = (thread_t *)hal_remote_lpt( XPTR( chdev_cxy , &chdev_ptr->server) );
150    server_xp  = XPTR( chdev_cxy , server_ptr );
151
152    // get local pointer on core running the server thread
153    core_ptr   = (core_t *)hal_remote_lpt( XPTR( chdev_cxy , &server_ptr->core ) );
154
155    // get server core local index
156    lid = hal_remote_lw( XPTR( chdev_cxy , &core_ptr->lid ) );
157
158#if (DEBUG_CHDEV_CMD_RX || DEBUG_CHDEV_CMD_TX)
159bool_t is_rx = hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->is_rx ) );
160#endif
161   
162#if DEBUG_CHDEV_CMD_RX
163uint32_t rx_cycle = (uint32_t)hal_get_cycles();
164if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
165printk("\n[DBG] %s : client_thread %x (%s) enter for RX / server = %x / cycle %d\n",
166__FUNCTION__, this, thread_type_str(this->type) , server_ptr, rx_cycle );
167#endif
168
169#if DEBUG_CHDEV_CMD_TX
170uint32_t tx_cycle = (uint32_t)hal_get_cycles();
171if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
172printk("\n[DBG] %s : client_thread %x (%s) enter for TX / server = %x / cycle %d\n",
173__FUNCTION__, this, thread_type_str(this->type) , server_ptr, tx_cycle );
174#endif
175
176    // build extended pointer on client thread xlist
177    xptr_t  list_xp    = XPTR( local_cxy , &this->wait_list );
178
179    // build extended pointer on chdev waiting queue root
180    xptr_t  root_xp    = XPTR( chdev_cxy , &chdev_ptr->wait_root );
181
182    // build extended pointer on server thread blocked state
183    xptr_t  blocked_xp = XPTR( chdev_cxy , &server_ptr->blocked );
184
185    // build extended pointer on lock protecting chdev waiting queue
186    lock_xp = XPTR( chdev_cxy , &chdev_ptr->wait_lock );
187
188    // critical section for the following sequence:
189    // (1) take the lock protecting waiting queue
190    // (2) block the client thread
191    // (3) unblock the server thread if required
192    // (4) register client thread in server queue
193    // (5) send IPI to force server scheduling
194    // (6) release the lock protecting waiting queue
195    // (7) deschedule
196    // ... in this order
197
198    // enter critical section
199    hal_disable_irq( &save_sr );
200
201    // take the lock protecting chdev waiting queue
202    remote_spinlock_lock( lock_xp );
203
204    // block current thread
205    thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_IO );
206
207#if (DEBUG_CHDEV_CMD_TX & 1)
208if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
209printk("\n[DBG] in %s : client thread %x blocked\n", __FUNCTION__, this );
210#endif
211
212    // unblock server thread if required
213    if( hal_remote_lw( blocked_xp ) & THREAD_BLOCKED_IDLE )
214    thread_unblock( server_xp , THREAD_BLOCKED_IDLE );
215
216#if (DEBUG_CHDEV_CMD_TX & 1)
217if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
218{
219printk("\n[DBG] in %s : server thread %x unblocked\n", __FUNCTION__, server_ptr );
220chdev_queue_display( chdev_xp );
221}
222#endif
223
224    // register client thread in waiting queue
225    xlist_add_last( root_xp , list_xp );
226
227#if (DEBUG_CHDEV_CMD_TX & 1)
228if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
229{
230printk("\n[DBG] in %s : thread %x registered write request in chdev\n", __FUNCTION__, this );
231chdev_queue_display( chdev_xp );
232}
233#endif
234 
235    // send IPI to core running the server thread when server != client
236    different = (lid != this->core->lid) || (local_cxy != chdev_cxy);
237    if( different )
238    {
239        dev_pic_send_ipi( chdev_cxy , lid ); 
240   
241#if (DEBUG_CHDEV_CMD_TX & 1)
242if( (is_rx == 0)  && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
243printk("\n[DBG] in %s : client thread %x sent IPI to server thread %x\n",
244__FUNCTION__, this, server_ptr );
245#endif
246
247    }
248 
249    // release lock
250    remote_spinlock_unlock( lock_xp );
251
252    // deschedule
253    assert( thread_can_yield( this ) , __FUNCTION__ , "illegal sched_yield\n" );
254    sched_yield("blocked on I/O");
255
256    // exit critical section
257    hal_restore_irq( save_sr );
258
259#if DEBUG_CHDEV_CMD_RX
260rx_cycle = (uint32_t)hal_get_cycles();
261if( (is_rx) && (DEBUG_CHDEV_CMD_RX < rx_cycle) )
262printk("\n[DBG] %s : client_thread %x (%s) exit for RX / cycle %d\n",
263__FUNCTION__, this, thread_type_str(this->type) , rx_cycle );
264#endif
265
266#if DEBUG_CHDEV_CMD_TX
267tx_cycle = (uint32_t)hal_get_cycles();
268if( (is_rx == 0) && (DEBUG_CHDEV_CMD_TX < tx_cycle) )
269printk("\n[DBG] %s : client_thread %x (%s) exit for TX / cycle %d\n",
270__FUNCTION__, this, thread_type_str(this->type) , tx_cycle );
271#endif
272
273#if (DEBUG_SYS_READ & 1)
274exit_chdev_cmd_read = (uint32_t)hal_get_cycles();
275#endif
276
277#if (DEBUG_SYS_WRITE & 1)
278exit_chdev_cmd_write = (uint32_t)hal_get_cycles();
279#endif
280
281}  // end chdev_register_command()
282
283///////////////////////////////////////////////
284void chdev_sequencial_server( chdev_t * chdev )
285{
286    xptr_t          client_xp;    // extended pointer on waiting thread
287    cxy_t           client_cxy;   // cluster of client thread
288    thread_t      * client_ptr;   // local pointer on client thread
289    thread_t      * server;       // local pointer on server thread
290    xptr_t          root_xp;      // extended pointer on device waiting queue root
291    xptr_t          lock_xp;      // extended pointer on lock ptotecting chdev queue
292
293    server = CURRENT_THREAD;
294
295    // get root and lock on command queue
296    root_xp = XPTR( local_cxy , &chdev->wait_root );
297    lock_xp = XPTR( local_cxy , &chdev->wait_lock );
298
299        // This infinite loop is executed by the DEV thread
300    // to handle commands registered in the chdev queue.
301    while( 1 )
302    {
303        // get the lock protecting the waiting queue
304        remote_spinlock_lock( lock_xp );
305
306        // check waiting queue state
307        if( xlist_is_empty( root_xp ) ) // waiting queue empty
308        {
309            // release lock
310            remote_spinlock_unlock( lock_xp );
311
312            // block
313            thread_block( XPTR( local_cxy , server ) , THREAD_BLOCKED_IDLE ); 
314
315            // deschedule
316            assert( thread_can_yield( server ) , __FUNCTION__ , "illegal sched_yield\n" );
317            sched_yield("I/O queue empty");
318        } 
319        else                            // waiting queue not empty
320        {
321            // get extended pointer on first client thread
322            client_xp = XLIST_FIRST_ELEMENT( root_xp , thread_t , wait_list );
323
324            // get client thread cluster and local pointer
325            client_cxy = GET_CXY( client_xp );
326            client_ptr = GET_PTR( client_xp );
327
328            // remove this first client thread from waiting queue
329            xlist_unlink( XPTR( client_cxy , &client_ptr->wait_list ) );
330
331            // release lock
332            remote_spinlock_unlock( lock_xp );
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 : server_thread %x start RX / client %x / cycle %d\n",
338__FUNCTION__ , server , client_ptr , 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 : server_thread %x start TX / client %x / cycle %d\n",
345__FUNCTION__ , server , client_ptr , tx_cycle );
346#endif
347
348#if (DEBUG_SYS_READ & 1)
349enter_chdev_server_read = (uint32_t)hal_get_cycles();
350#endif
351
352#if (DEBUG_SYS_WRITE & 1)
353enter_chdev_server_write = (uint32_t)hal_get_cycles();
354#endif
355
356            // call driver command function to execute I/O operation
357            chdev->cmd( client_xp );
358       
359            // unblock client thread
360            thread_unblock( client_xp , THREAD_BLOCKED_IO );
361
362#if DEBUG_CHDEV_SERVER_RX
363rx_cycle = (uint32_t)hal_get_cycles();
364if( (chdev->is_rx) && (DEBUG_CHDEV_SERVER_RX < rx_cycle) )
365printk("\n[DBG] %s : server_thread %x completes RX / client %x / cycle %d\n",
366__FUNCTION__ , server , client_ptr , rx_cycle );
367#endif
368
369#if DEBUG_CHDEV_SERVER_TX
370tx_cycle = (uint32_t)hal_get_cycles();
371if( (chdev->is_rx == 0) && (DEBUG_CHDEV_SERVER_TX < tx_cycle) )
372printk("\n[DBG] %s : server_thread %x completes TX / client %x / cycle %d\n",
373__FUNCTION__ , server , client_ptr , tx_cycle );
374#endif
375
376#if (DEBUG_SYS_READ & 1)
377exit_chdev_server_read = (uint32_t)hal_get_cycles();
378#endif
379
380#if (DEBUG_SYS_WRITE & 1)
381exit_chdev_server_write = (uint32_t)hal_get_cycles();
382#endif
383
384        }
385    }  // end while
386}  // end chdev_sequencial_server()
387
388////////////////////////////////////////
389xptr_t chdev_from_file( xptr_t file_xp )
390{
391    cxy_t         file_cxy;
392    vfs_file_t  * file_ptr;
393    uint32_t      inode_type;
394    vfs_inode_t * inode_ptr;
395    chdev_t     * chdev_ptr;
396
397    assert( (file_xp != XPTR_NULL) , __FUNCTION__,
398    "file_xp == XPTR_NULL\n" );
399
400    // get cluster and local pointer on remote file descriptor
401    // associated inode and chdev are stored in same cluster as the file desc.
402    file_cxy  = GET_CXY( file_xp );
403    file_ptr  = (vfs_file_t *)GET_PTR( file_xp );
404
405    // get inode type from file descriptor
406    inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) );
407    inode_ptr  = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
408
409    assert( (inode_type == INODE_TYPE_DEV) , __FUNCTION__ ,
410    "inode type %d is not INODE_TYPE_DEV\n", inode_type );
411
412    // get chdev local pointer from inode extension
413    chdev_ptr = (chdev_t *)hal_remote_lpt( XPTR( file_cxy , &inode_ptr->extend ) );
414
415    return XPTR( file_cxy , chdev_ptr );
416
417}  // end chdev_from_file()
418
419////////////////////////
420void chdev_dir_display()
421{
422    uint32_t  i;
423    cxy_t     cxy;
424    chdev_t * ptr;
425    uint32_t  base;
426    reg_t     save_sr;
427
428    // get pointers on TXT0 chdev
429    xptr_t    txt0_xp  = chdev_dir.txt_tx[0];
430    cxy_t     txt0_cxy = GET_CXY( txt0_xp );
431    chdev_t * txt0_ptr = GET_PTR( txt0_xp );
432
433    // get extended pointer on remote TXT0 chdev lock
434    xptr_t  lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
435
436    // get TXT0 lock in busy waiting mode
437    remote_spinlock_lock_busy( lock_xp , &save_sr );
438
439    // header
440    nolock_printk("\n***** external chdevs directory *****\n");
441
442    // IOB
443    cxy  = GET_CXY( chdev_dir.iob );
444    ptr  = GET_PTR( chdev_dir.iob );
445    base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
446    nolock_printk("  - iob       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
447
448    // PIC
449    cxy  = GET_CXY( chdev_dir.pic );
450    ptr  = GET_PTR( chdev_dir.pic );
451    base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
452    nolock_printk("  - pic       : cxy = %X / ptr = %X / base = %X\n", cxy, ptr, base);
453
454    // TXT
455    for( i = 0 ; i < LOCAL_CLUSTER->nb_txt_channels ; i++ )
456    {
457        cxy = GET_CXY( chdev_dir.txt_rx[i] );
458        ptr = GET_PTR( chdev_dir.txt_rx[i] );
459        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
460        nolock_printk("  - txt_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
461
462        cxy = GET_CXY( chdev_dir.txt_tx[i] );
463        ptr = GET_PTR( chdev_dir.txt_tx[i] );
464        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
465        nolock_printk("  - txt_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
466    }
467
468    // IOC
469    for( i = 0 ; i < LOCAL_CLUSTER->nb_ioc_channels ; i++ )
470    {
471        cxy = GET_CXY( chdev_dir.ioc[i] );
472        ptr = GET_PTR( chdev_dir.ioc[i] );
473        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
474        nolock_printk("  - ioc[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
475    }
476
477    // FBF
478    for( i = 0 ; i < LOCAL_CLUSTER->nb_fbf_channels ; i++ )
479    {
480        cxy  = GET_CXY( chdev_dir.fbf[i] );
481        ptr  = GET_PTR( chdev_dir.fbf[i] );
482        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
483        nolock_printk("  - fbf[%d]    : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
484    }
485
486    // NIC
487    for( i = 0 ; i < LOCAL_CLUSTER->nb_nic_channels ; i++ )
488    {
489        cxy = GET_CXY( chdev_dir.nic_rx[i] );
490        ptr = GET_PTR( chdev_dir.nic_rx[i] );
491        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
492        nolock_printk("  - nic_rx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
493
494        cxy = GET_CXY( chdev_dir.nic_tx[i] );
495        ptr = GET_PTR( chdev_dir.nic_tx[i] );
496        base = (uint32_t)hal_remote_lwd( XPTR( cxy , &ptr->base ) );
497        nolock_printk("  - nic_tx[%d] : cxy = %X / ptr = %X / base = %X\n", i, cxy, ptr, base);
498    }
499
500    // release lock
501    remote_spinlock_unlock_busy( lock_xp , save_sr );
502
503}  // end chdev_dir_display()
504
505///////////////////////////////////////////
506void chdev_queue_display( xptr_t chdev_xp )
507{
508    cxy_t       chdev_cxy;          // chdev cluster
509    chdev_t   * chdev_ptr;          // chdev local pointer
510    xptr_t      root_xp;            // extended pointer on waiting queuue root
511    char        name[16];           // local copie of chdev name
512    xptr_t      iter_xp;            // extended pointer on xlist_t field in waiting thread
513    xptr_t      thread_xp;          // extended pointer on thread registered in queue
514    cxy_t       thread_cxy;         // cluster identifier for waiting thread
515    thread_t  * thread_ptr;         // local pointer on waiting thread
516    trdid_t     trdid;              // waiting thread identifier
517    process_t * process;            // waiting thread process descriptor
518    pid_t       pid;                // waiting thread process identifier
519
520    // get cluster and local pointer on chdev
521    chdev_cxy = GET_CXY( chdev_xp );
522    chdev_ptr = GET_PTR( chdev_xp );
523
524    // get extended pointer on root of requests queue
525    root_xp = XPTR( chdev_cxy , &chdev_ptr->wait_root );
526
527    // get chdev name
528    hal_remote_strcpy( XPTR( local_cxy , name ), XPTR( chdev_cxy , chdev_ptr->name ) );
529
530    // check queue empty
531    if( xlist_is_empty( root_xp ) )
532    {
533        printk("\n***** Waiting queue empty for chdev %s\n", name ); 
534    }
535    else
536    {
537        printk("\n***** Waiting queue for chdev %s\n", name ); 
538
539        // scan the waiting queue
540        XLIST_FOREACH( root_xp , iter_xp )
541        {
542            thread_xp  = XLIST_ELEMENT( iter_xp , thread_t , wait_list );
543            thread_cxy = GET_CXY( thread_xp );
544            thread_ptr = GET_PTR( thread_xp );
545            trdid      = hal_remote_lw ( XPTR( thread_cxy , &thread_ptr->trdid   ) );
546            process    = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->process ) );
547                        pid        = hal_remote_lw ( XPTR( thread_cxy , &process->pid        ) );
548
549            printk("- thread %X / cluster %X / trdid %X / pid %X\n",
550            thread_ptr, thread_cxy, trdid, pid );
551        }
552    }
553}  // end chdev_queue_display()
554
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