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source: trunk/kernel/vfs/devfs.c @ 40

Last change on this file since 40 was 23, checked in by alain, 7 years ago
Introduce syscalls.
File size: 20.1 KB

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1	/*
2	* devfs.c - DEVFS File system API implementation.
3	*
4	* Author Mohamed Lamine Karaoui (2014,2015)
5	* Alain Greiner (2016,2017)
6	*
7	* Copyright (c) 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 <hal_types.h>
26	#include <hal_special.h>
27	#include <printk.h>
28	#include <kmem.h>
29	#include <string.h>
30	#include <chdev.h>
31	#include <core.h>
32	#include <thread.h>
33	#include <vfs.h>
34	#include <errno.h>
35	#include <devfs.h>
36	#include <rpc.h>
37
38
39	//////////////////////////////////////////////////////////////////////////////////////////
40	// Extern variables
41	//////////////////////////////////////////////////////////////////////////////////////////
42
43	extern vfs_ctx_t fs_context[FS_TYPES_NR]; // allocated in vfs.c file
44
45	extern remote_barrier_t global_barrier; // allocated in kernel_init.c
46
47	extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
48
49	////////////////////////////////////////////////////////////////////////////////////////
50	// DEVFS private functions
51	////////////////////////////////////////////////////////////////////////////////////////
52
53	////////////////////////////////////////////////////////////////////////////////////////
54	// This function creates in the local cluster the dentry and the associated inode,
55	// for a DEVFS directory (level 0 or level 1 in DEVFS tree).
56	////////////////////////////////////////////////////////////////////////////////////////
57	// @ name : directory entry name.
58	// @ parent_xp : extended pointer on parent inode.
59	// @ inode_xp : [out] buffer for extended pointer on created inode.
60	////////////////////////////////////////////////////////////////////////////////////////
61	static void devfs_create_directory( char * name,
62	xptr_t parent_xp,
63	xptr_t * inode_xp )
64	{
65	error_t error;
66	xptr_t new_dentry_xp; // extended pointer on created dentry
67	xptr_t new_inode_xp; // extended pointer on created inode
68
69	// get parent inode cluster and local pointer
70	cxy_t parent_cxy = GET_CXY( parent_xp );
71	vfs_inode_t * parent_ptr = (vfs_inode_t *)GET_PTR( parent_xp );
72
73	// create vfs_dentry in cluster containing the parent inode
74	if( parent_cxy == local_cxy )
75	{
76	error = vfs_dentry_create( FS_TYPE_DEVFS,
77	name,
78	parent_ptr,
79	&new_dentry_xp );
80	}
81	else
82	{
83	rpc_vfs_dentry_create_client( parent_cxy,
84	FS_TYPE_DEVFS,
85	name,
86	parent_ptr,
87	&new_dentry_xp,
88	&error );
89	}
90
91	if ( error )
92	{
93	printk("\n[PANIC] in %s : cannot create dentry for %s in cluster %x/n",
94	__FUNCTION__ , name , local_cxy );
95	hal_core_sleep();
96	}
97
98	// create vfs_inode in local cluster TODO define the 4 arguments below [AG]
99	uint32_t attr = 0;
100	uint32_t rights = 0;
101	uid_t uid = 0;
102	gid_t gid = 0;
103	error = vfs_inode_create( new_dentry_xp,
104	FS_TYPE_DEVFS,
105	INODE_TYPE_DIR,
106	attr,
107	rights,
108	uid,
109	gid,
110	&new_inode_xp );
111	if( error )
112	{
113	printk("\n[PANIC] in %s : cannot create inode for %s in cluster %x/n",
114	__FUNCTION__ , name , local_cxy );
115	hal_core_sleep();
116	}
117
118	// return extended pointer on directory inode
119	*inode_xp = new_inode_xp;
120
121	} // end devfs_create_directory()
122
123	////////////////////////////////////////////////////////////////////////////////////////
124	// This function creates in the local cluster the dentry and the associated inode,
125	// for a chdev (level 2 in DEVFS tree).
126	////////////////////////////////////////////////////////////////////////////////////////
127	// @ chdev : local pointer on local chdev.
128	// @ name : directory entry name.
129	// @ parent : local pointer on local parent inode.
130	// @ inode_xp : [out] buffer for extended pointer on created inode.
131	////////////////////////////////////////////////////////////////////////////////////////
132	static void devfs_register_chdev( chdev_t * chdev,
133	char * name,
134	vfs_inode_t * parent,
135	xptr_t * inode_xp )
136	{
137	error_t error;
138	xptr_t new_dentry_xp;
139	xptr_t new_inode_xp;
140
141	printk("\n @@@ devfs_chdev : 0 / name = %s\n", name );
142
143	// create vfs_dentry in local cluster
144	error = vfs_dentry_create( FS_TYPE_DEVFS,
145	name,
146	parent,
147	&new_dentry_xp );
148
149	printk("\n @@@ devfs_chdev : 1 / name = %s\n", name );
150
151	if ( error )
152	{
153	printk("\n[PANIC] in %s : cannot create dentry for %s in cluster %x/n",
154	__FUNCTION__ , name , local_cxy );
155	hal_core_sleep();
156	}
157
158	printk("\n @@@ devfs_chdev : 2 / name = %s\n", name );
159
160	// create vfs_inode in local cluster
161	uint32_t attr = 0;
162	uint32_t rights = 0;
163	uid_t uid = 0;
164	gid_t gid = 0;
165	error = vfs_inode_create( new_dentry_xp,
166	FS_TYPE_DEVFS,
167	INODE_TYPE_DEV,
168	attr,
169	rights,
170	uid,
171	gid,
172	&new_inode_xp );
173
174	printk("\n @@@ devfs_chdev : 3 / name = %s\n", name );
175
176	if( error )
177	{
178	printk("\n[PANIC] in %s : cannot create inode for %s in cluster %x/n",
179	__FUNCTION__ , name , local_cxy );
180	hal_core_sleep();
181	}
182
183	// return extended pointer on chdev inode
184	*inode_xp = new_inode_xp;
185
186	} // end devfs_register_chdev()
187
188
189
190	///////////////////////////////////////////////////////////////////////////////////////
191	// Generic API : the following functions are called by the VFS,
192	// and must be defined by all supported file systems.
193	///////////////////////////////////////////////////////////////////////////////////////
194
195	////////////////////////////////////////////
196
197	////////////////////////////////////////////
198	error_t devfs_mount( xptr_t parent_inode_xp,
199	char * devfs_root_name )
200	{
201	assert( (CURRENT_CORE->lid == 0) , __FUNCTION__ , "only CP0 should do it" );
202
203	vfs_inode_t * parent_inode_ptr;
204	cxy_t parent_inode_cxy;
205	vfs_ctx_t * vfs_ctx;
206
207	char node_name[16];
208	uint32_t channel;
209
210	xptr_t root_inode_xp;
211	xptr_t external_inode_xp;
212	xptr_t internal_inode_xp;
213	xptr_t chdev_inode_xp;
214
215	chdev_t * chdev_ptr;
216
217	// get number of kernel instances and extended pointer on global barrier
218	cluster_t * cluster = LOCAL_CLUSTER;
219	uint32_t nb_clusters = cluster->x_size * cluster->y_size;
220	xptr_t barrier_xp = XPTR( cluster->io_cxy , &global_barrier );
221
222	// get VFS root inode cluster and local pointer
223	parent_inode_cxy = GET_CXY( parent_inode_xp );
224	parent_inode_ptr = (vfs_inode_t *)GET_PTR( parent_inode_xp );
225
226	// get local pointer on VFS context for DEVFS
227	vfs_ctx = &fs_context[FS_TYPE_DEVFS];
228
229	///// step 1 : all clusters initialize local DEVFS context /////
230
231	printk("\n @@@ devfs_mount : 0 / name = %s\n", devfs_root_name );
232
233	devfs_ctx_init( vfs_ctx , parent_inode_xp );
234
235	///// step 2 : cluster_0 creates DEVFS root /////
236
237	printk("\n @@@ devfs_mount : 1 / name = %s\n", devfs_root_name );
238
239	if( local_cxy == 0 )
240	{
241	devfs_create_directory( devfs_root_name,
242	parent_inode_xp,
243	&root_inode_xp );
244	printk("\n @@@ devfs_mount : 2\n");
245
246	}
247
248	// synchronize all clusters
249	remote_barrier( barrier_xp , nb_clusters );
250
251	///// step 3 : all clusters create "internal" directory and chdevs /////
252
253	printk("\n @@@ devfs_mount : 3 / name = %s\n", devfs_root_name );
254
255	snprintf( node_name , 16 , "internal_%x" , local_cxy );
256
257	printk("\n @@@ devfs_mount : 4 / name = %s\n", devfs_root_name );
258
259	devfs_create_directory( node_name,
260	root_inode_xp,
261	&internal_inode_xp );
262
263	printk("\n @@@ devfs_mount : 5 / name = %s\n", devfs_root_name );
264
265	// create ICU chdev inode
266	chdev_ptr = (chdev_t *)GET_PTR( chdev_dir.icu[local_cxy] );
267	devfs_register_chdev( chdev_ptr,
268	"icu",
269	(vfs_inode_t *)GET_PTR( internal_inode_xp ),
270	&chdev_inode_xp );
271
272	printk("\n @@@ devfs_mount : 6 / name = %s\n", devfs_root_name );
273
274	// create MMC chdev inode
275	chdev_ptr = (chdev_t *)GET_PTR( chdev_dir.mmc[local_cxy] );
276	devfs_register_chdev( chdev_ptr,
277	"mmc",
278	(vfs_inode_t *)GET_PTR( internal_inode_xp ),
279	&chdev_inode_xp );
280
281	printk("\n @@@ devfs_mount : 7 / name = %s\n", devfs_root_name );
282
283	// create DMA chdev inodes (one DMA channel per core)
284	for( channel = 0 ; channel < cluster->cores_nr ; channel++ )
285	{
286	chdev_ptr = (chdev_t *)GET_PTR( chdev_dir.dma[channel] );
287	snprintf( node_name , 16 , "dma_%d" , channel );
288	devfs_register_chdev( chdev_ptr,
289	node_name,
290	(vfs_inode_t *)GET_PTR( internal_inode_xp ),
291	&chdev_inode_xp );
292
293	printk("\n @@@ devfs_mount : 8 / name = %s\n", devfs_root_name );
294
295	}
296
297	///// step 4 : cluster_io creates "external" directory and chdevs /////
298
299	if( local_cxy == cluster->io_cxy )
300	{
301	devfs_create_directory( "external",
302	root_inode_xp,
303	&external_inode_xp );
304
305	printk("\n @@@ devfs_mount : 9 / name = %s\n", devfs_root_name );
306
307	// create IOB chdev inode
308	chdev_ptr = (chdev_t *)GET_PTR( chdev_dir.iob );
309	devfs_register_chdev( chdev_ptr,
310	"iob",
311	(vfs_inode_t *)GET_PTR( external_inode_xp ),
312	&chdev_inode_xp );
313
314	printk("\n @@@ devfs_mount : 10 / name = %s\n", devfs_root_name );
315
316	// create PIC chdev inode
317	chdev_ptr = (chdev_t *)GET_PTR( chdev_dir.pic );
318	devfs_register_chdev( chdev_ptr,
319	"pic",
320	(vfs_inode_t *)GET_PTR( external_inode_xp ),
321	&chdev_inode_xp );
322
323	// create TXT chdev inodes
324	for( channel = 0 ; channel < CONFIG_MAX_TXT_CHANNELS ; channel++ )
325	{
326	chdev_ptr = (chdev_t *)GET_PTR( chdev_dir.txt[channel] );
327	snprintf( node_name , 16 , "txt_%d" , channel );
328	devfs_register_chdev( chdev_ptr,
329	node_name,
330	(vfs_inode_t *)GET_PTR( external_inode_xp ),
331	&chdev_inode_xp );
332	}
333
334	// create IOC chdev inodes
335	for( channel = 0 ; channel < CONFIG_MAX_IOC_CHANNELS ; channel++ )
336	{
337	chdev_ptr = (chdev_t *)GET_PTR( chdev_dir.ioc[channel] );
338	snprintf( node_name , 16 , "ioc_%d" , channel );
339	devfs_register_chdev( chdev_ptr,
340	node_name,
341	(vfs_inode_t *)GET_PTR( external_inode_xp ),
342	&chdev_inode_xp );
343	}
344
345	// create FBF chdev inodes
346	for( channel = 0 ; channel < CONFIG_MAX_IOC_CHANNELS ; channel++ )
347	{
348	chdev_ptr = (chdev_t *)GET_PTR( chdev_dir.ioc[channel] );
349	snprintf( node_name , 16 , "fbf_%d" , channel );
350	devfs_register_chdev( chdev_ptr,
351	node_name,
352	(vfs_inode_t *)GET_PTR( external_inode_xp ),
353	&chdev_inode_xp );
354	}
355
356	// create NIC_RX chdevs
357	for( channel = 0 ; channel < CONFIG_MAX_NIC_CHANNELS ; channel++ )
358	{
359	chdev_ptr = (chdev_t *)GET_PTR( chdev_dir.nic_rx[channel] );
360	snprintf( node_name , 16 , "nic_rx_%d" , channel );
361	devfs_register_chdev( chdev_ptr,
362	node_name,
363	(vfs_inode_t *)GET_PTR( external_inode_xp ),
364	&chdev_inode_xp );
365	}
366
367	// create NIC_TX chdev inodes
368	for( channel = 0 ; channel < CONFIG_MAX_NIC_CHANNELS ; channel++ )
369	{
370	chdev_ptr = (chdev_t *)GET_PTR( chdev_dir.nic_tx[channel] );
371	snprintf( node_name , 16 , "nic_tx_%d" , channel );
372	devfs_register_chdev( chdev_ptr,
373	node_name,
374	(vfs_inode_t *)GET_PTR( external_inode_xp ),
375	&chdev_inode_xp );
376	printk("\n @@@ devfs_mount : 11 / name = %s\n", devfs_root_name );
377
378	}
379	}
380
381	// synchronize all clusters
382	remote_barrier( barrier_xp , nb_clusters );
383
384	return 0;
385
386	} // end devfs_init()
387
388
389	////////////////////////////////////////////
390	error_t devfs_ctx_init( vfs_ctx_t * vfs_ctx,
391	xptr_t root_inode_xp )
392	{
393	vfs_ctx->type = FS_TYPE_DEVFS;
394	vfs_ctx->attr = 0; // not READ_ONLY / not SYNC
395	vfs_ctx->count = 0; // unused for DEVFS
396	vfs_ctx->blksize = 0; // unused for DEVFS
397	vfs_ctx->root_xp = root_inode_xp;
398	vfs_ctx->extend = NULL; // unused for DEVFS
399
400	spinlock_init( &vfs_ctx->lock );
401
402	bitmap_init( vfs_ctx->bitmap , CONFIG_VFS_MAX_INODES );
403
404	return 0;
405	}
406
407
408	////////////////////////////////////////////////////
409	error_t devfs_inode_create( vfs_inode_t * vfs_inode,
410	chdev_t * chdev )
411	{
412	kmem_req_t req;
413	devfs_inode_t * devfs_inode;
414
415	// allocate memory for FATFS inode extension
416	req.type = KMEM_DEVFS_INODE;
417	req.size = sizeof(devfs_inode_t);
418	req.flags = AF_KERNEL \| AF_ZERO;
419	devfs_inode = (devfs_inode_t *)kmem_alloc( &req );
420
421	if( devfs_inode == NULL ) return ENOMEM;
422
423	// link DEVFS inode to VFS inode
424	vfs_inode->extend = devfs_inode;
425
426	// initialise DEVFS inode
427	devfs_inode->chdev = chdev;
428
429	return 0;
430	}
431
432	///////////////////////////////////////////////////
433	void devfs_inode_destroy( vfs_inode_t * vfs_inode )
434	{
435	kmem_req_t req;
436	devfs_inode_t * devfs_inode;
437
438	// get pointer on DEVFS inode
439	devfs_inode = (devfs_inode_t *)vfs_inode->extend;
440
441	req.type = KMEM_DEVFS_INODE;
442	req.ptr = devfs_inode;
443	kmem_free( &req );
444
445	vfs_inode->extend = NULL;
446	}
447
448
449	/* deprecated [AG]
450
451	error_t devfs_open_file( vfs_file_t * file,
452	void * extend );
453	{
454	error_t err;
455	register struct devfs_context_s *ctx;
456	register struct devfs_file_s *info;
457	chdev_t * chdev;
458	vfs_inode_t * inode;
459	dev_request_t rq;
460	kmem_req_t req;
461
462	inode = file->inode;
463
464	info = file->fr_pv;
465	ctx = (struct devfs_context_s *)&inode->i_ctx->ctx_devfs;
466
467	if(!(inode->i_attr & VFS_DIR))
468	{
469	dev = (struct device_s*)inode->i_pv;
470
471	if(dev->type == DEV_INTERNAL)
472	return EPERM;
473
474	if(dev->type == DEV_BLK)
475	VFS_SET(inode->i_attr,VFS_DEV_BLK);
476	else
477	VFS_SET(inode->i_attr,VFS_DEV_CHR);
478
479	if(dev->op.dev.open != NULL)
480	{
481	rq.fremote = file;
482	if((err=dev->op.dev.open(dev, &rq)))
483	return err;
484	}
485
486	priv->dev = (void*)dev;
487
488	return 0;
489	}
490
491	if(info == NULL)
492	{
493	req.type = KMEM_DEVFS_FILE;
494	req.size = sizeof(*info);
495	req.flags = AF_KERNEL;
496	info = kmem_alloc(&req);
497	}
498
499	if(info == NULL) return ENOMEM;
500
501	metafs_iter_init(&devfs_db.root, &info->iter);
502	info->ctx = ctx;
503	file->fr_pv = info;
504
505	metafs_print(&devfs_db.root);
506	return 0;
507	}
508
509	#define TMP_BUFF_SZ 512
510
511	//FIXME:
512	//add a "while" loop for the case where the
513	//buffer TMP_BUFF_SZ is smaller than
514	//buffer->size
515	//////////////////////////////
516	devfs_read( vfs_file_t * file,
517	char * buffer )
518	{
519	chdev_t * chdev;
520	dev_request_t rq;
521	uint32_t count;
522	uint8_t buff[TMP_BUFF_SZ];
523
524	// get pointer on chdev
525	chdev = (chdev_t *)file->extend;
526
527	if( chdev->func == DEV_FUNC_TXT )
528	{
529	}
530	if( chdev->func == DEV_FUNC_IOC )
531	{
532	}
533	else
534	{
535	printk("\n[PANIC] in %s : illegal device functionnal type
536
537	rq.dst = &buff[0];
538	rq.count = TMP_BUFF_SZ;
539	rq.flags = 0;
540	rq.file = file;
541
542	if((count = dev->op.dev.read(dev, &rq)) < 0)
543	return count;
544
545	buffer->scpy_to_buff(buffer, &buff[0], count);
546	return count;
547	}
548
549	//FIXME: To improve this an avoid the extra copy,
550	//we could set along with the buffer(src and dest)
551	//the functions to manipulate them, such as in
552	//do_exec.c
553	///////////////////////////////
554	devfs_write( vfs_file_t * file,
555	char * buffer )
556	{
557	register struct device_s *dev;
558	uint8_t buff[TMP_BUFF_SZ];
559	dev_request_t rq;
560
561	dev = (struct device_s*)file->f_private.dev;
562
563	//FIXME avoid the extra copy ?
564	buffer->scpy_from_buff(buffer, (void*)&buff[0], TMP_BUFF_SZ);
565	rq.src = (void*)&buff[0];
566	rq.count = buffer->size;
567	rq.flags = 0;
568	rq.file = file;
569
570	return dev->op.dev.write(dev, &rq);
571	}
572
573	VFS_LSEEK_FILE(devfs_lseek)
574	{
575	register struct device_s *dev;
576	dev_request_t rq;
577
578	dev = (struct device_s*)file->fr_inode->i_pv;
579
580	if(dev->op.dev.lseek == NULL)
581	return VFS_ENOTUSED;
582
583	rq.fremote = file;
584	return dev->op.dev.lseek(dev, &rq);
585	}
586
587	VFS_CLOSE_FILE(devfs_close)
588	{
589	register struct device_s *dev;
590	dev_request_t rq;
591
592	if(file->fr_inode->i_attr & VFS_DIR)
593	return 0;
594
595	dev = (struct device_s*)file->fr_inode->i_pv;
596
597	if(dev->op.dev.close == NULL)
598	return 0;
599
600	rq.fremote = file;
601	return dev->op.dev.close(dev, &rq);
602	}
603
604	VFS_RELEASE_FILE(devfs_release)
605	{
606	kmem_req_t req;
607
608	if(file->fr_pv == NULL)
609	return 0;
610
611	req.type = KMEM_DEVFS_FILE;
612	req.ptr = file->fr_pv;
613	kmem_free(&req);
614
615	file->fr_pv = NULL;
616	return 0;
617	}
618
619	VFS_READ_DIR(devfs_readdir)
620	{
621	register struct devfs_file_s *info;
622	register struct metafs_s *current;
623	register struct device_s *current_dev;
624
625	info = file->fr_pv;
626
627	if(file->fr_pv == NULL)
628	return ENOTDIR;
629
630	if((current = metafs_lookup_next(&devfs_db.root, &info->iter)) == NULL)
631	return EEODIR;
632
633	current_dev = metafs_container(current, struct device_s, node);
634	dirent->u_attr = (current_dev->type == DEV_BLK) ? VFS_DEV_BLK : VFS_DEV_CHR;
635
636	strcpy((char*)dirent->u_name, metafs_get_name(current));
637
638	dirent->u_ino = (uint_t) current_dev->base_paddr;
639
640	return 0;
641	}
642
643	VFS_MMAP_FILE(devfs_mmap)
644	{
645	register struct device_s *dev;
646	dev_request_t rq;
647
648	dev = (struct device_s*)file->f_private.dev;
649
650	if(dev->op.dev.mmap == NULL)
651	return ENODEV;
652
653	rq.flags = 0;
654	rq.file = file;
655	rq.region = region;
656
657	return dev->op.dev.mmap(dev, &rq);
658	}
659
660	VFS_MMAP_FILE(devfs_munmap)
661	{
662	register struct device_s *dev;
663	dev_request_t rq;
664
665	dev = (struct device_s*)file->f_private.dev;
666
667	if(dev->op.dev.munmap == NULL)
668	return ENODEV;
669
670	rq.flags = 0;
671	rq.file = file;
672	rq.region = region;
673
674	return dev->op.dev.munmap(dev, &rq);
675	}
676
677
678	const struct vfs_file_op_s devfs_f_op =
679	{
680	.open = devfs_open,
681	.read = devfs_read,
682	.write = devfs_write,
683	.lseek = devfs_lseek,
684	.mmap = devfs_mmap,
685	.munmap = devfs_munmap,
686	.readdir = devfs_readdir,
687	.close = devfs_close,
688	.release = devfs_release
689	};
690
691	*/
692
693

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