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source: trunk/kernel/fs/devfs.c @ 411

Last change on this file since 411 was 407, checked in by alain, 7 years ago
First implementation of fork/exec.
File size: 16.6 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 <hal_uspace.h>
28	#include <printk.h>
29	#include <chdev.h>
30	#include <dev_txt.h>
31	#include <cluster.h>
32	#include <vfs.h>
33	#include <kmem.h>
34	#include <devfs.h>
35
36	/////////////////////////////////////////////////////////////////////////////////////////
37	// Extern variables
38	/////////////////////////////////////////////////////////////////////////////////////////
39
40	extern vfs_ctx_t fs_context[]; // allocated in kernel_init.c
41	extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
42
43	#if CONFIG_READ_DEBUG
44	extern uint32_t enter_devfs_move;
45	extern uint32_t exit_devfs_move;
46	#endif
47
48	///////////////////////////////
49	devfs_ctx_t * devfs_ctx_alloc()
50	{
51	kmem_req_t req;
52
53	req.type = KMEM_DEVFS_CTX;
54	req.size = sizeof(devfs_ctx_t);
55	req.flags = AF_KERNEL \| AF_ZERO;
56
57	return (devfs_ctx_t *)kmem_alloc( &req );
58	}
59
60	/////////////////////////////////////////////
61	void devfs_ctx_init( devfs_ctx_t * devfs_ctx,
62	xptr_t devfs_dev_inode_xp,
63	xptr_t devfs_external_inode_xp )
64	{
65	devfs_ctx->dev_inode_xp = devfs_dev_inode_xp;
66	devfs_ctx->external_inode_xp = devfs_external_inode_xp;
67
68	fs_context[FS_TYPE_DEVFS].extend = devfs_ctx;
69	}
70
71	/////////////////////////////////////////////////
72	void devfs_ctx_destroy( devfs_ctx_t * devfs_ctx )
73	{
74	kmem_req_t req;
75
76	req.type = KMEM_DEVFS_CTX;
77	req.ptr = devfs_ctx;
78	kmem_free( &req );
79	}
80
81	///////////////////////////////////////////////////
82	void devfs_global_init( xptr_t parent_inode_xp,
83	xptr_t * devfs_dev_inode_xp,
84	xptr_t * devfs_external_inode_xp )
85	{
86	error_t error;
87
88	devfs_dmsg("\n[DBG] %s : enter in cluster %x\n",
89	__FUNCTION__ , local_cxy );
90
91	// creates DEVFS "dev" inode in cluster IO
92	error = vfs_add_child_in_parent( LOCAL_CLUSTER->io_cxy,
93	INODE_TYPE_DIR,
94	FS_TYPE_DEVFS,
95	parent_inode_xp,
96	"dev",
97	NULL,
98	devfs_dev_inode_xp );
99
100	assert( (error == 0) , __FUNCTION__ , "cannot create <dev>\n" );
101
102	devfs_dmsg("\n[DBG] %s : <dev> created in cluster %x\n",
103	__FUNCTION__ , local_cxy );
104
105	// create DEVFS "external" inode in cluster IO
106	error = vfs_add_child_in_parent( LOCAL_CLUSTER->io_cxy,
107	INODE_TYPE_DIR,
108	FS_TYPE_DEVFS,
109	*devfs_dev_inode_xp,
110	"external",
111	NULL,
112	devfs_external_inode_xp );
113
114	assert( (error == 0) , __FUNCTION__ , "cannot create <external>\n" );
115
116	devfs_dmsg("\n[DBG] %s : <external> created in cluster %x\n",
117	__FUNCTION__ , local_cxy );
118	}
119
120	///////////////////////////////////////////////////
121	void devfs_local_init( xptr_t devfs_dev_inode_xp,
122	xptr_t devfs_external_inode_xp,
123	xptr_t * devfs_internal_inode_xp )
124	{
125	char node_name[16];
126	xptr_t chdev_xp;
127	cxy_t chdev_cxy;
128	chdev_t * chdev_ptr;
129	xptr_t inode_xp;
130	uint32_t channel;
131
132	// create "internal" directory linked to "dev"
133	snprintf( node_name , 16 , "internal_%x" , local_cxy );
134	vfs_add_child_in_parent( local_cxy,
135	INODE_TYPE_DIR,
136	FS_TYPE_DEVFS,
137	devfs_dev_inode_xp,
138	node_name,
139	NULL,
140	devfs_internal_inode_xp );
141
142	devfs_dmsg("\n[DBG] %s : created <%s> inode in cluster %x\n",
143	__FUNCTION__ , node_name , local_cxy );
144
145	// create MMC chdev inode
146	chdev_xp = chdev_dir.mmc[local_cxy];
147	if( chdev_xp != XPTR_NULL)
148	{
149	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
150	vfs_add_child_in_parent( local_cxy,
151	INODE_TYPE_DEV,
152	FS_TYPE_DEVFS,
153	*devfs_internal_inode_xp,
154	chdev_ptr->name,
155	GET_PTR( chdev_xp ),
156	&inode_xp );
157
158	devfs_dmsg("\n[DBG] %s : created <%s> inode in cluster %x\n",
159	__FUNCTION__ , chdev_ptr->name , local_cxy );
160
161	}
162
163	// create DMA chdev inodes (one DMA channel per core)
164	for( channel = 0 ; channel < LOCAL_CLUSTER->cores_nr ; channel++ )
165	{
166	chdev_xp = chdev_dir.dma[channel];
167	if( chdev_xp != XPTR_NULL)
168	{
169	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
170	vfs_add_child_in_parent( local_cxy,
171	INODE_TYPE_DEV,
172	FS_TYPE_DEVFS,
173	*devfs_internal_inode_xp,
174	chdev_ptr->name,
175	GET_PTR( chdev_xp ),
176	&inode_xp );
177
178	devfs_dmsg("\n[DBG] %s : created <%s> inode in cluster %x\n",
179	__FUNCTION__ , chdev_ptr->name , local_cxy );
180
181	}
182	}
183
184	// create an IOB inode in cluster containing IOB chdev
185	chdev_xp = chdev_dir.iob;
186	if( chdev_xp != XPTR_NULL )
187	{
188	chdev_cxy = GET_CXY( chdev_xp );
189	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
190	if( chdev_cxy == local_cxy )
191	{
192	vfs_add_child_in_parent( local_cxy,
193	INODE_TYPE_DEV,
194	FS_TYPE_DEVFS,
195	devfs_external_inode_xp,
196	chdev_ptr->name,
197	GET_PTR( chdev_xp ),
198	&inode_xp );
199
200	devfs_dmsg("\n[DBG] %s : created <%s> inode in cluster %x\n",
201	__FUNCTION__ , chdev_ptr->name , local_cxy );
202
203	}
204	}
205
206	// create a PIC inode in cluster containing PIC chdev
207	chdev_xp = chdev_dir.pic;
208	if( chdev_xp != XPTR_NULL )
209	{
210	chdev_cxy = GET_CXY( chdev_xp );
211	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
212	if( chdev_cxy == local_cxy )
213	{
214	vfs_add_child_in_parent( local_cxy,
215	INODE_TYPE_DEV,
216	FS_TYPE_DEVFS,
217	devfs_external_inode_xp,
218	chdev_ptr->name,
219	GET_PTR( chdev_xp ),
220	&inode_xp );
221
222	devfs_dmsg("\n[DBG] %s : created <%s> inode in cluster %x\n",
223	__FUNCTION__ , chdev_ptr->name , local_cxy );
224
225	}
226	}
227
228	// create a TXT_RX inode in each cluster containing a TXT_RX chdev
229	for( channel = 0 ; channel < CONFIG_MAX_TXT_CHANNELS ; channel++ )
230	{
231	chdev_xp = chdev_dir.txt_rx[channel];
232	if( chdev_xp != XPTR_NULL )
233	{
234	chdev_cxy = GET_CXY( chdev_xp );
235	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
236	if( chdev_cxy == local_cxy )
237	{
238	vfs_add_child_in_parent( local_cxy,
239	INODE_TYPE_DEV,
240	FS_TYPE_DEVFS,
241	devfs_external_inode_xp,
242	chdev_ptr->name,
243	GET_PTR( chdev_xp ),
244	&inode_xp );
245
246	devfs_dmsg("\n[DBG] %s : created <%s> inode in cluster %x\n",
247	__FUNCTION__ , chdev_ptr->name , local_cxy );
248
249	}
250	}
251	}
252
253	// create a TXT_TX inode in each cluster containing a TXT_TX chdev
254	for( channel = 0 ; channel < CONFIG_MAX_TXT_CHANNELS ; channel++ )
255	{
256	chdev_xp = chdev_dir.txt_tx[channel];
257	if( chdev_xp != XPTR_NULL )
258	{
259	chdev_cxy = GET_CXY( chdev_xp );
260	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
261	if( chdev_cxy == local_cxy )
262	{
263	vfs_add_child_in_parent( local_cxy,
264	INODE_TYPE_DEV,
265	FS_TYPE_DEVFS,
266	devfs_external_inode_xp,
267	chdev_ptr->name,
268	GET_PTR( chdev_xp ),
269	&inode_xp );
270
271	devfs_dmsg("\n[DBG] %s : created <%s> inode in cluster %x\n",
272	__FUNCTION__ , chdev_ptr->name , local_cxy );
273
274	}
275	}
276	}
277
278	// create an IOC inode in each cluster containing an IOC chdev
279	for( channel = 0 ; channel < CONFIG_MAX_IOC_CHANNELS ; channel++ )
280	{
281	chdev_xp = chdev_dir.ioc[channel];
282	if( chdev_xp != XPTR_NULL )
283	{
284	chdev_cxy = GET_CXY( chdev_xp );
285	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
286	if( chdev_cxy == local_cxy )
287	{
288	vfs_add_child_in_parent( local_cxy,
289	INODE_TYPE_DEV,
290	FS_TYPE_DEVFS,
291	devfs_external_inode_xp,
292	chdev_ptr->name,
293	GET_PTR( chdev_xp ),
294	&inode_xp );
295
296	devfs_dmsg("\n[DBG] %s : created <%s> inode in cluster %x\n",
297	__FUNCTION__ , chdev_ptr->name , local_cxy );
298
299	}
300	}
301	}
302
303	// create a FBF inode in each cluster containing a FBF chdev
304	for( channel = 0 ; channel < CONFIG_MAX_IOC_CHANNELS ; channel++ )
305	{
306	chdev_xp = chdev_dir.fbf[channel];
307	if( chdev_xp != XPTR_NULL )
308	{
309	chdev_cxy = GET_CXY( chdev_xp );
310	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
311	if( chdev_cxy == local_cxy )
312	{
313	vfs_add_child_in_parent( local_cxy,
314	INODE_TYPE_DEV,
315	FS_TYPE_DEVFS,
316	devfs_external_inode_xp,
317	chdev_ptr->name,
318	GET_PTR( chdev_xp ),
319	&inode_xp );
320
321	devfs_dmsg("\n[DBG] %s : created <%s> inode in cluster %x\n",
322	__FUNCTION__ , chdev_ptr->name , local_cxy );
323
324	}
325	}
326	}
327
328	// create a NIC_RX inode in each cluster containing a NIC_RX chdev
329	for( channel = 0 ; channel < CONFIG_MAX_NIC_CHANNELS ; channel++ )
330	{
331	chdev_xp = chdev_dir.nic_rx[channel];
332	if( chdev_xp != XPTR_NULL )
333	{
334	chdev_cxy = GET_CXY( chdev_xp );
335	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
336	if( chdev_cxy == local_cxy )
337	{
338	vfs_add_child_in_parent( local_cxy,
339	INODE_TYPE_DEV,
340	FS_TYPE_DEVFS,
341	devfs_external_inode_xp,
342	chdev_ptr->name,
343	GET_PTR( chdev_xp ),
344	&inode_xp );
345
346	devfs_dmsg("\n[DBG] %s : created <%s> inode in cluster %x\n",
347	__FUNCTION__ , chdev_ptr->name , local_cxy );
348
349	}
350	}
351	}
352
353	// create a NIC_TX inode in each cluster containing a NIC_TX chdev
354	for( channel = 0 ; channel < CONFIG_MAX_NIC_CHANNELS ; channel++ )
355	{
356	chdev_xp = chdev_dir.nic_tx[channel];
357	if( chdev_xp != XPTR_NULL )
358	{
359	chdev_cxy = GET_CXY( chdev_xp );
360	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
361	if( chdev_cxy == local_cxy )
362	{
363	vfs_add_child_in_parent( local_cxy,
364	INODE_TYPE_DEV,
365	FS_TYPE_DEVFS,
366	devfs_external_inode_xp,
367	chdev_ptr->name,
368	GET_PTR( chdev_xp ),
369	&inode_xp );
370
371	devfs_dmsg("\n[DBG] %s : created <%s> inode in cluster %x\n",
372	__FUNCTION__ , chdev_ptr->name , local_cxy );
373
374	}
375	}
376	}
377	} // end devfs_local_init()
378
379	//////////////////////////////////////////
380	int devfs_user_move( bool_t to_buffer,
381	xptr_t file_xp,
382	void * u_buf,
383	uint32_t size )
384	{
385	assert( ( file_xp != XPTR_NULL ) , __FUNCTION__ , "file_xp == XPTR_NULL" );
386
387	assert( ( size < CONFIG_TXT_KBUF_SIZE ) , __FUNCTION__ , "string size too large" );
388
389	cxy_t file_cxy; // remote file descriptor cluster
390	vfs_file_t * file_ptr; // remote file descriptor local pointer
391	vfs_inode_type_t inode_type; // associated inode type
392	vfs_inode_t * inode_ptr; // associated inode local pointer
393	chdev_t * chdev_ptr; // associated chdev type
394	uint32_t func; // chdev functionnal type
395	uint32_t channel; // chdev channel index
396	error_t error;
397
398	char k_buf[CONFIG_TXT_KBUF_SIZE]; // local kernel buffer
399
400	devfs_dmsg("\n[DBG] %s enter / cycle %d\n",
401	__FUNCTION__ , hal_time_stamp() );
402
403	#if CONFIG_READ_DEBUG
404	enter_devfs_move = hal_time_stamp();
405	#endif
406
407	// get cluster and local pointer on remote file descriptor
408	// associated inode and chdev are stored in same cluster as the file desc.
409	file_cxy = GET_CXY( file_xp );
410	file_ptr = (vfs_file_t *)GET_PTR( file_xp );
411
412	// get inode type from remote file descriptor
413	inode_type = hal_remote_lw( XPTR( file_cxy , &file_ptr->type ) );
414	inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( file_cxy , &file_ptr->inode ) );
415
416	assert( (inode_type == INODE_TYPE_DEV) , __FUNCTION__ ,
417	"inode type is not INODE_TYPE_DEV" );
418
419	// get chdev local pointer from remote inode extension
420	chdev_ptr = (chdev_t *)hal_remote_lpt( XPTR( file_cxy , &inode_ptr->extend ) );
421
422	// get chdev functionnal type and channel
423	func = hal_remote_lw( XPTR( file_cxy , &chdev_ptr->func ) );
424	channel = hal_remote_lw( XPTR( file_cxy , &chdev_ptr->channel ) );
425
426	// action depends on "func" and "to_buffer"
427	if( func == DEV_FUNC_TXT )
428	{
429	if( to_buffer ) // TXT read
430	{
431	uint32_t i;
432	for( i = 0 ; i < size ; i++ )
433	{
434	error = dev_txt_read( channel , &k_buf[i] );
435
436	if( error )
437	{
438
439	devfs_dmsg("\n[DBG] %s exit error / cycle %d\n",
440	__FUNCTION__ , hal_time_stamp() );
441
442	return -1;
443	}
444	else
445	{
446	hal_strcpy_to_uspace( u_buf , k_buf , size );
447	}
448	}
449
450	#if CONFIG_READ_DEBUG
451	exit_devfs_move = hal_time_stamp();
452	#endif
453
454	devfs_dmsg("\n[DBG] %s exit success / size = %d / cycle %d\n",
455	__FUNCTION__ , size , hal_time_stamp() );
456
457	return size;
458	}
459	else // TXT write
460	{
461	hal_strcpy_from_uspace( k_buf , u_buf , size );
462
463	error = dev_txt_write( channel , k_buf , size );
464	if( error )
465	{
466
467	devfs_dmsg("\n[DBG] %s exit error / cycle %d\n",
468	__FUNCTION__ , hal_time_stamp() );
469
470	return -1;
471	}
472	else
473	{
474
475	devfs_dmsg("\n[DBG] %s exit success / size = %d / cycle %d\n",
476	__FUNCTION__ , size , hal_time_stamp() );
477
478	return size;
479	}
480	}
481	}
482	else
483	{
484	panic("device type %s does not support direct user access", chdev_func_str(func) );
485
486	return -1;
487	}
488	} // end devfs_user_move()
489
490

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