source: trunk/kernel/mm/ppm.c @ 614

Last change on this file since 614 was 611, checked in by alain, 3 years ago

Introduce sigificant modifs in VFS to support the <ls> command,
and the . and .. directories entries.

File size: 17.5 KB
Line 
1/*
2 * ppm.c - Per-cluster Physical Pages Manager implementation
3 *
4 * Authors  Ghassan Almaless (2008,2009,2010,2011,2012)
5 *          Alain Greiner    (2016,2017,2018)
6 *
7 * Copyright (c) UPMC Sorbonne Universites
8 *
9 * This file is part of ALMOS-MKH.
10 *
11 * ALMOS-MKH.is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2.0 of the License.
14 *
15 * ALMOS-MKH.is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with ALMOS-MKH.; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#include <kernel_config.h>
26#include <hal_kernel_types.h>
27#include <hal_special.h>
28#include <printk.h>
29#include <list.h>
30#include <bits.h>
31#include <page.h>
32#include <dqdt.h>
33#include <busylock.h>
34#include <queuelock.h>
35#include <thread.h>
36#include <cluster.h>
37#include <kmem.h>
38#include <process.h>
39#include <mapper.h>
40#include <ppm.h>
41#include <vfs.h>
42
43////////////////////////////////////////////////////////////////////////////////////////
44//     functions to  translate [ page <-> base <-> ppn ]
45////////////////////////////////////////////////////////////////////////////////////////
46
47////////////////////////////////////////////////
48inline bool_t ppm_page_is_valid( page_t * page )
49{
50        ppm_t    * ppm  = &LOCAL_CLUSTER->ppm;
51        uint32_t   pgnr = (uint32_t)( page - ppm->pages_tbl );
52        return (pgnr <= ppm->pages_nr);
53}
54
55/////////////////////////////////////////////
56inline xptr_t ppm_page2base( xptr_t page_xp )
57{
58        ppm_t  * ppm      = &LOCAL_CLUSTER->ppm;
59
60    cxy_t    page_cxy = GET_CXY( page_xp );
61    page_t * page_ptr = GET_PTR( page_xp );
62
63   void   * base_ptr = ppm->vaddr_base + 
64                       ((page_ptr - ppm->pages_tbl)<<CONFIG_PPM_PAGE_SHIFT);
65
66        return XPTR( page_cxy , base_ptr );
67
68} // end ppm_page2base()
69
70/////////////////////////////////////////////
71inline xptr_t ppm_base2page( xptr_t base_xp )
72{
73        ppm_t  * ppm = &LOCAL_CLUSTER->ppm;
74
75    cxy_t    base_cxy = GET_CXY( base_xp );
76    void   * base_ptr = GET_PTR( base_xp );
77
78        page_t * page_ptr = ppm->pages_tbl + 
79                        ((base_ptr - ppm->vaddr_base)>>CONFIG_PPM_PAGE_SHIFT);
80
81        return XPTR( base_cxy , page_ptr );
82
83}  // end ppm_base2page()
84
85
86
87///////////////////////////////////////////
88inline ppn_t ppm_page2ppn( xptr_t page_xp )
89{
90        ppm_t  * ppm      = &LOCAL_CLUSTER->ppm;
91
92    cxy_t    page_cxy = GET_CXY( page_xp );
93    page_t * page_ptr = GET_PTR( page_xp );
94
95    paddr_t  paddr    = PADDR( page_cxy , (page_ptr - ppm->pages_tbl)<<CONFIG_PPM_PAGE_SHIFT );
96
97    return (ppn_t)(paddr >> CONFIG_PPM_PAGE_SHIFT);
98
99}  // end hal_page2ppn()
100
101///////////////////////////////////////
102inline xptr_t ppm_ppn2page( ppn_t ppn )
103{
104        ppm_t   * ppm  = &LOCAL_CLUSTER->ppm;
105
106    paddr_t  paddr = ((paddr_t)ppn) << CONFIG_PPM_PAGE_SHIFT;
107
108    cxy_t    cxy   = CXY_FROM_PADDR( paddr );
109    lpa_t    lpa   = LPA_FROM_PADDR( paddr );
110
111    return XPTR( cxy , &ppm->pages_tbl[lpa>>CONFIG_PPM_PAGE_SHIFT] );
112
113}  // end hal_ppn2page
114
115
116
117///////////////////////////////////////
118inline xptr_t ppm_ppn2base( ppn_t ppn )
119{
120        ppm_t  * ppm   = &LOCAL_CLUSTER->ppm;
121   
122    paddr_t  paddr = ((paddr_t)ppn) << CONFIG_PPM_PAGE_SHIFT;
123
124    cxy_t    cxy   = CXY_FROM_PADDR( paddr );
125    lpa_t    lpa   = LPA_FROM_PADDR( paddr );
126
127        return XPTR( cxy , (void *)ppm->vaddr_base + lpa );
128
129}  // end ppm_ppn2base()
130
131///////////////////////////////////////////
132inline ppn_t ppm_base2ppn( xptr_t base_xp )
133{
134        ppm_t  * ppm      = &LOCAL_CLUSTER->ppm;
135
136    cxy_t    base_cxy = GET_CXY( base_xp );
137    void   * base_ptr = GET_PTR( base_xp );
138
139    paddr_t  paddr    = PADDR( base_cxy , (base_ptr - ppm->vaddr_base) );
140
141    return (ppn_t)(paddr >> CONFIG_PPM_PAGE_SHIFT);
142
143}  // end ppm_base2ppn()
144
145
146////////////////////////////////////////////////////////////////////////////////////////
147//     functions to  allocate / release  physical pages
148////////////////////////////////////////////////////////////////////////////////////////
149
150///////////////////////////////////////////
151void ppm_free_pages_nolock( page_t * page )
152{
153        page_t   * buddy;            // searched buddy page descriptor
154        uint32_t   buddy_index;      // buddy page index
155        page_t   * current;          // current (merged) page descriptor
156        uint32_t   current_index;    // current (merged) page index
157        uint32_t   current_order;    // current (merged) page order
158
159        ppm_t    * ppm         = &LOCAL_CLUSTER->ppm;
160        page_t   * pages_tbl   = ppm->pages_tbl;
161
162        assert( !page_is_flag( page , PG_FREE ) ,
163    "page already released : ppn = %x\n" , ppm_page2ppn(XPTR(local_cxy,page)) );
164
165        assert( !page_is_flag( page , PG_RESERVED ) ,
166    "reserved page : ppn = %x\n" , ppm_page2ppn(XPTR(local_cxy,page)) );
167
168        // update released page descriptor flags
169        page_set_flag( page , PG_FREE );
170
171        // search the buddy page descriptor
172        // - merge with current page descriptor if found
173        // - exit to release the current page descriptor if not found
174        current       = page ,
175        current_index = (uint32_t)(page - ppm->pages_tbl);
176        for( current_order = page->order ;
177             current_order < CONFIG_PPM_MAX_ORDER ;
178             current_order++ )
179        {
180                buddy_index = current_index ^ (1 << current_order);
181                buddy       = pages_tbl + buddy_index;
182
183                if( !page_is_flag( buddy , PG_FREE ) || (buddy->order != current_order) ) break;
184
185                // remove buddy from free list
186                list_unlink( &buddy->list );
187                ppm->free_pages_nr[current_order] --;
188
189                // merge buddy with current
190                buddy->order = 0;
191                current_index &= buddy_index;
192        }
193
194        // update merged page descriptor order
195        current        = pages_tbl + current_index;
196        current->order = current_order;
197
198        // insert current in free list
199        list_add_first( &ppm->free_pages_root[current_order] , &current->list );
200        ppm->free_pages_nr[current_order] ++;
201
202}  // end ppm_free_pages_nolock()
203
204////////////////////////////////////////////
205page_t * ppm_alloc_pages( uint32_t   order )
206{
207        uint32_t   current_order;
208        page_t   * remaining_block;
209        uint32_t   current_size;
210
211#if DEBUG_PPM_ALLOC_PAGES
212thread_t * this = CURRENT_THREAD;
213uint32_t cycle = (uint32_t)hal_get_cycles();
214if( DEBUG_PPM_ALLOC_PAGES < cycle )
215printk("\n[%s] thread[%x,%x] enter for %d page(s) / cycle %d\n",
216__FUNCTION__, this->process->pid, this->trdid, 1<<order, cycle );
217#endif
218
219#if(DEBUG_PPM_ALLOC_PAGES & 0x1)
220if( DEBUG_PPM_ALLOC_PAGES < cycle )
221ppm_print("enter ppm_alloc_pages");
222#endif
223
224        ppm_t    * ppm = &LOCAL_CLUSTER->ppm;
225
226// check order
227assert( (order < CONFIG_PPM_MAX_ORDER) , "illegal order argument = %d\n" , order );
228
229        page_t * block = NULL; 
230
231        // take lock protecting free lists
232        busylock_acquire( &ppm->free_lock );
233
234        // find a free block equal or larger to requested size
235        for( current_order = order ; current_order < CONFIG_PPM_MAX_ORDER ; current_order ++ )
236        {
237                if( !list_is_empty( &ppm->free_pages_root[current_order] ) )
238                {
239                        block = LIST_FIRST( &ppm->free_pages_root[current_order] , page_t , list );
240                        list_unlink( &block->list );
241                        break;
242                }
243        }
244
245        if( block == NULL ) // return failure
246        {
247                // release lock protecting free lists
248                busylock_release( &ppm->free_lock );
249
250#if DEBUG_PPM_ALLOC_PAGES
251cycle = (uint32_t)hal_get_cycles();
252if( DEBUG_PPM_ALLOC_PAGES < cycle )
253printk("\n[%s] thread[%x,%x] cannot allocate %d page(s) / cycle %d\n",
254__FUNCTION__, this->process->pid, this->trdid, 1<<order, cycle );
255#endif
256
257                return NULL;
258        }
259
260        // update free-lists after removing a block
261        ppm->free_pages_nr[current_order] --;
262        current_size = (1 << current_order);
263
264        // split the removed block in smaller sub-blocks if required
265        // and update the free-lists accordingly
266        while( current_order > order )
267        {
268                current_order --;
269                current_size >>= 1;
270
271                remaining_block = block + current_size;
272                remaining_block->order = current_order;
273
274                list_add_first( &ppm->free_pages_root[current_order] , &remaining_block->list );
275                ppm->free_pages_nr[current_order] ++;
276        }
277
278        // update page descriptor
279        page_clear_flag( block , PG_FREE );
280        page_refcount_up( block );
281        block->order = order;
282
283        // release lock protecting free lists
284        busylock_release( &ppm->free_lock );
285
286    // update DQDT
287    dqdt_increment_pages( order );
288
289#if DEBUG_PPM_ALLOC_PAGES
290cycle = (uint32_t)hal_get_cycles();
291if( DEBUG_PPM_ALLOC_PAGES < cycle )
292printk("\n[%s] thread[%x,%x] exit for %d page(s) / ppn = %x / cycle %d\n",
293__FUNCTION__, this->process->pid, this->trdid, 
2941<<order, ppm_page2ppn(XPTR( local_cxy , block )), cycle );
295#endif
296
297#if(DEBUG_PPM_ALLOC_PAGES & 0x1)
298if( DEBUG_PPM_ALLOC_PAGES < cycle )
299ppm_print("exit ppm_alloc_pages");
300#endif
301
302        return block;
303
304}  // end ppm_alloc_pages()
305
306
307////////////////////////////////////
308void ppm_free_pages( page_t * page )
309{
310        ppm_t * ppm = &LOCAL_CLUSTER->ppm;
311
312#if DEBUG_PPM_FREE_PAGES
313uint32_t cycle = (uint32_t)hal_get_cycles();
314if( DEBUG_PPM_FREE_PAGES < cycle )
315printk("\n[%s] thread[%x,%x] enter for %d page(s) / ppn %x / cycle %d\n",
316__FUNCTION__, this->process->pid, this->trdid, 
3171<<page->order, ppm_page2ppn(XPTR(local_cxy , page)), cycle );
318#endif
319
320#if(DEBUG_PPM_FREE_PAGES & 0x1)
321if( DEBUG_PPM_FREE_PAGES < cycle )
322ppm_print("enter ppm_free_pages");
323#endif
324
325        // get lock protecting free_pages[] array
326        busylock_acquire( &ppm->free_lock );
327
328        ppm_free_pages_nolock( page );
329
330        // release lock protecting free_pages[] array
331        busylock_release( &ppm->free_lock );
332
333    // update DQDT
334    dqdt_decrement_pages( page->order );
335
336#if DEBUG_PPM_FREE_PAGES
337cycle = (uint32_t)hal_get_cycles();
338if( DEBUG_PPM_FREE_PAGES < cycle )
339printk("\n[%s] thread[%x,%x] exit for %d page(s) / ppn %x / cycle %d\n",
340__FUNCTION__, this->process->pid, this->trdid, 
3411<<page->order, ppm_page2ppn(XPTR(local_cxy , page)), cycle );
342#endif
343
344#if(DEBUG_PPM_FREE_PAGES & 0x1)
345if( DEBUG_PPM_FREE_PAGES < cycle )
346ppm_print("exit ppm_free_pages");
347#endif
348
349}  // end ppm_free_pages()
350
351///////////////////////////////
352void ppm_print( char * string )
353{
354        uint32_t       order;
355        list_entry_t * iter;
356        page_t       * page;
357
358    ppm_t * ppm = &LOCAL_CLUSTER->ppm;
359
360        // get lock protecting free lists
361        busylock_acquire( &ppm->free_lock );
362
363        printk("\n***  PPM in cluster %x / %s / %d pages ***\n",
364    local_cxy , string, ppm->pages_nr );
365
366        for( order = 0 ; order < CONFIG_PPM_MAX_ORDER ; order++ )
367        {
368                printk("- order = %d / free_pages = %d\t: ",
369                       order , ppm->free_pages_nr[order] );
370
371                LIST_FOREACH( &ppm->free_pages_root[order] , iter )
372                {
373                        page = LIST_ELEMENT( iter , page_t , list );
374                        printk("%x," , page - ppm->pages_tbl );
375                }
376
377                printk("\n");
378        }
379
380        // release lock protecting free lists
381        busylock_release( &ppm->free_lock );
382}
383
384///////////////////////////////////////
385error_t ppm_assert_order( ppm_t * ppm )
386{
387        uint32_t       order;
388        list_entry_t * iter;
389        page_t       * page;
390
391        for( order=0 ; order < CONFIG_PPM_MAX_ORDER ; order++ )
392        {
393                if( list_is_empty( &ppm->free_pages_root[order] ) ) continue;
394
395                LIST_FOREACH( &ppm->free_pages_root[order] , iter )
396                {
397                        page = LIST_ELEMENT( iter , page_t , list );
398                        if( page->order != order )  return -1;
399                }
400        }
401
402        return 0;
403}
404
405
406//////////////////////////////////////////////////////////////////////////////////////
407//     functions to handle  dirty physical pages
408//////////////////////////////////////////////////////////////////////////////////////
409
410//////////////////////////////////////////
411bool_t ppm_page_do_dirty( xptr_t page_xp )
412{
413        bool_t done = false;
414
415    // get page cluster and local pointer
416    page_t * page_ptr = GET_PTR( page_xp );
417    cxy_t    page_cxy = GET_CXY( page_xp );
418
419    // get local pointer on PPM (same in all clusters)
420        ppm_t * ppm = &LOCAL_CLUSTER->ppm;
421
422    // build extended pointers on page lock, page flags, and PPM dirty list lock
423    xptr_t page_lock_xp  = XPTR( page_cxy , &page_ptr->lock  );   
424    xptr_t page_flags_xp = XPTR( page_cxy , &page_ptr->flags );
425    xptr_t dirty_lock_xp = XPTR( page_cxy , &ppm->dirty_lock );
426           
427        // lock the remote PPM dirty_list
428        remote_queuelock_acquire( dirty_lock_xp );
429
430    // lock the remote page
431    remote_busylock_acquire( page_lock_xp );
432
433    // get remote page flags
434    uint32_t flags = hal_remote_l32( page_flags_xp );
435
436        if( (flags & PG_DIRTY) == 0 )
437        {
438                // set dirty flag in page descriptor
439        hal_remote_s32( page_flags_xp , flags | PG_DIRTY );
440
441                // The PPM dirty list is a LOCAL list !!!
442        // We must update 4 pointers to insert a new page in this list.
443        // We can use the standard LIST API when the page is local,
444        // but we cannot use the standard API if the page is remote...
445
446        if( page_cxy == local_cxy )         // locally update the PPM dirty list
447        {
448            list_add_first( &ppm->dirty_root , &page_ptr->list );
449        } 
450        else                                // remotely update the PPM dirty list
451        {
452            // get local and remote pointers on "root" list entry
453            list_entry_t * root    = &ppm->dirty_root;
454            xptr_t         root_xp = XPTR( page_cxy , root );
455
456            // get local and remote pointers on "page" list entry
457            list_entry_t * list    = &page_ptr->list;
458            xptr_t         list_xp = XPTR( page_cxy , list );
459
460            // get local and remote pointers on first dirty page
461            list_entry_t * dirt    = hal_remote_lpt( XPTR( page_cxy, &root->next ) );
462            xptr_t         dirt_xp = XPTR( page_cxy , dirt );
463
464            // set root.next, list.next, list pred, curr.pred in remote cluster
465            hal_remote_spt( root_xp                    , list );
466            hal_remote_spt( list_xp                    , dirt );
467            hal_remote_spt( list_xp + sizeof(intptr_t) , root );
468            hal_remote_spt( dirt_xp + sizeof(intptr_t) , list );
469        }
470
471                done = true;
472        }
473
474    // unlock the remote page
475    remote_busylock_release( page_lock_xp );
476
477        // unlock the remote PPM dirty_list
478        remote_queuelock_release( dirty_lock_xp );
479
480        return done;
481
482} // end ppm_page_do_dirty()
483
484////////////////////////////////////////////
485bool_t ppm_page_undo_dirty( xptr_t page_xp )
486{
487        bool_t done = false;
488
489    // get page cluster and local pointer
490    page_t * page_ptr = GET_PTR( page_xp );
491    cxy_t    page_cxy = GET_CXY( page_xp );
492
493    // get local pointer on PPM (same in all clusters)
494        ppm_t * ppm = &LOCAL_CLUSTER->ppm;
495
496    // build extended pointers on page lock, page flags, and PPM dirty list lock
497    xptr_t page_lock_xp  = XPTR( page_cxy , &page_ptr->lock  );
498    xptr_t page_flags_xp = XPTR( page_cxy , &page_ptr->flags );
499    xptr_t dirty_lock_xp = XPTR( page_cxy , &ppm->dirty_lock );
500           
501        // lock the remote PPM dirty_list
502        remote_queuelock_acquire( XPTR( page_cxy , &ppm->dirty_lock ) );
503
504    // lock the remote page
505    remote_busylock_acquire( page_lock_xp );
506
507    // get remote page flags
508    uint32_t flags = hal_remote_l32( page_flags_xp );
509
510        if( (flags & PG_DIRTY) )  // page is dirty
511        {
512                // reset dirty flag in page descriptor
513        hal_remote_s32( page_flags_xp , flags & (~PG_DIRTY) );
514
515                // The PPM dirty list is a LOCAL list !!!
516        // We must update 4 pointers to remove a page from this list.
517        // we can use the standard LIST API when the page is local,
518        // but we cannot use the standard API if the page is remote...
519
520        if( page_cxy == local_cxy )         // locally update the PPM dirty list
521        {
522            list_unlink( &page_ptr->list );
523        } 
524        else                                // remotely update the PPM dirty list
525        {
526            // get local and remote pointers on "page" list entry
527            list_entry_t * list    = &page_ptr->list;
528            xptr_t         list_xp = XPTR( page_cxy , list );
529
530            // get local and remote pointers on "next" page list entry
531            list_entry_t * next    = hal_remote_lpt( list_xp );
532            xptr_t         next_xp = XPTR( page_cxy , next );
533
534            // get local and remote pointers on "pred" page list entry
535            list_entry_t * pred    = hal_remote_lpt( list_xp + sizeof(intptr_t) );
536            xptr_t         pred_xp = XPTR( page_cxy , pred );
537
538            // set root.next, list.next, list pred, curr.pred in remote cluster
539            hal_remote_spt( pred_xp                    , next );
540            hal_remote_spt( list_xp                    , NULL );
541            hal_remote_spt( list_xp + sizeof(intptr_t) , NULL );
542            hal_remote_spt( next_xp + sizeof(intptr_t) , pred );
543        }
544
545                done = true;
546        }
547
548    // unlock the remote page
549    remote_busylock_release( page_lock_xp );
550
551        // unlock the remote PPM dirty_list
552        remote_queuelock_release( dirty_lock_xp );
553
554        return done;
555
556}  // end ppm_page_undo_dirty()
557
558/////////////////////////////////
559void ppm_sync_dirty_pages( void )
560{
561        ppm_t * ppm = &LOCAL_CLUSTER->ppm;
562
563    // get local pointer on PPM dirty_root
564    list_entry_t * dirty_root = &ppm->dirty_root;
565
566    // build extended pointer on PPM dirty_lock
567    xptr_t dirty_lock_xp = XPTR( local_cxy , &ppm->dirty_lock );
568
569        // get the PPM dirty_list lock
570        remote_queuelock_acquire( dirty_lock_xp );
571
572        while( !list_is_empty( &ppm->dirty_root ) )
573        {
574                page_t * page = LIST_FIRST( dirty_root ,  page_t , list );
575        xptr_t   page_xp = XPTR( local_cxy , page );
576
577        // build extended pointer on page lock
578        xptr_t page_lock_xp = XPTR( local_cxy , &page->lock );
579
580                // get the page lock
581                remote_busylock_acquire( page_lock_xp );
582
583                // sync the page
584                vfs_fs_move_page( page_xp , false );  // from mapper to device
585
586                // release the page lock
587                remote_busylock_release( page_lock_xp );
588        }
589
590        // release the PPM dirty_list lock
591        remote_queuelock_release( dirty_lock_xp );
592
593}  // end ppm_sync_dirty_pages()
594
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