source: trunk/kernel/devices/dev_ioc.c @ 207

Last change on this file since 207 was 207, checked in by max@…, 5 years ago

mask/unmask the IRQ

File size: 7.6 KB
Line 
1/*
2 * dev_ioc.c - IOC (Block Device Controler) generic device API implementation.
3 *
4 * Author  Alain Greiner    (2016)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MK
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-kernel; 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_gpt.h>
27#include <soclib_bdv.h>
28#include <soclib_hba.h>
29//#include <soclib_sdc.h>
30//#include <soclib_spi.h>
31//#include <soclib_rdk.h>
32#include <thread.h>
33#include <printk.h>
34#include <chdev.h>
35#include <dev_ioc.h>
36
37/////////////////////////////////////////////////////////////////////////////////////////
38// Extern global variables
39/////////////////////////////////////////////////////////////////////////////////////////
40
41extern chdev_directory_t  chdev_dir;     // allocated in kernel_init.c
42
43//////////////////////////////////
44void dev_ioc_init( chdev_t * ioc )
45{
46    // the PIC chdev must be initialized before the IOC chdev, because
47    // the IOC chdev initialisation requires the routing of an external IRQ
48    xptr_t  pic_xp  = chdev_dir.pic;
49
50    assert( (pic_xp != XPTR_NULL) , __FUNCTION__ , "PIC not initialised before IOC" );
51
52    // get implementation and channel from chdev descriptor
53    uint32_t  impl    = ioc->impl;
54    uint32_t  channel = ioc->channel;
55
56    // set chdev name
57    snprintf( ioc->name , 16 , "ioc_%d" , channel );
58
59    // set driver specific fields in chdev descriptor and call driver init function
60    if( impl == IMPL_IOC_BDV )
61    {
62        ioc->cmd = &soclib_bdv_cmd;
63        ioc->isr = &soclib_bdv_isr;
64        soclib_bdv_init( ioc );
65    }
66    else if( impl == IMPL_IOC_HBA )
67    {
68        ioc->cmd = &soclib_hba_cmd;
69        ioc->isr = &soclib_hba_isr;
70        soclib_hba_init( ioc );
71    }
72    else
73    {
74        assert( false , __FUNCTION__ , "undefined IOC device implementation" );
75    }
76
77    // select a core to execute the IOC server thread
78    lid_t lid = cluster_select_local_core();
79
80    // bind the IOC IRQ to the selected core
81    dev_pic_bind_irq( lid , ioc );
82
83    // enable IRQ
84    dev_pic_enable_irq( lid ,ioc );
85
86    // create server thread
87    thread_t * new_thread;
88    error_t    error;
89
90    error = thread_kernel_create( &new_thread,
91                                  THREAD_DEV,
92                                  &chdev_sequencial_server,
93                                  ioc,
94                                  lid ); 
95
96    assert( (error == 0) , __FUNCTION__ , "cannot create server thread" );
97
98    // set "server" field in ioc descriptor
99    ioc->server = new_thread;
100   
101    // start server thread
102    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
103 
104}  // end dev_ioc_init()
105
106//////////////////////////////////////////////////////////////////////////////////
107// This static function is called by dev_ioc_read() & dev_ioc_write() functions.
108// It builds and registers the command in the calling thread descriptor.
109// Then, it registers the calling thead in chdev waiting queue.
110// Finally it blocks on the THREAD_BLOCKED_DEV condition and deschedule.
111////////////////////////////////////i/////////////////////////////////////////////
112static error_t dev_ioc_access( uint32_t   cmd_type,
113                               uint8_t  * buffer,
114                               uint32_t   lba,
115                               uint32_t   count )
116{
117    thread_t * this = CURRENT_THREAD;              // pointer on client thread
118
119    ioc_dmsg("\n[INFO] in %s : thread %x in process %x"
120             " for lba = %x / buffer = %x / at cycle %d\n", 
121             __FUNCTION__ , this->trdid , this->process->pid , 
122             lba , (intptr_t)buffer , hal_get_cycles() );
123
124    // software L2/L3 cache coherence for memory buffer
125    if( chdev_dir.iob ) 
126    {
127        if ( cmd_type == IOC_READ ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
128        else                        dev_mmc_sync ( XPTR( local_cxy , buffer ) , count<<9 );
129    }
130
131    // get extended pointer on IOC chdev descriptor
132    xptr_t  dev_xp = chdev_dir.ioc[0];
133
134    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined IOC chdev descriptor" );
135
136    // register command in calling thread descriptor
137    this->command.ioc.dev_xp    = dev_xp;
138    this->command.ioc.type      = cmd_type;
139    this->command.ioc.buf_xp    = XPTR( local_cxy , buffer );
140    this->command.ioc.lba       = lba;
141    this->command.ioc.count     = count;
142
143    // register client thread in IOC chdev waiting queue, activate server thread,
144    // block client thread on THREAD_BLOCKED_IO and deschedule.
145    // it is re-activated by the ISR signaling IO operation completion.
146    chdev_register_command( dev_xp , this );
147
148    ioc_dmsg("\n[INFO] in %s : thread %x in process %x"
149             " completes / error = %d / at cycle %d\n", 
150             __FUNCTION__ , this->trdid , this->process->pid ,
151             this->command.ioc.error , hal_get_cycles() );
152
153    // return I/O operation status
154    return this->command.ioc.error; 
155
156}  // end dev_ioc_access()
157
158////////////////////////////////////////////
159error_t dev_ioc_read( uint8_t      * buffer,
160                      uint32_t       lba,
161                      uint32_t       count )
162{
163    return dev_ioc_access( IOC_READ , buffer , lba , count ); 
164} 
165
166////////////////////////////////////////////
167error_t dev_ioc_write( uint8_t     * buffer,
168                       uint32_t      lba,
169                       uint32_t      count )
170{
171    return dev_ioc_access( IOC_WRITE , buffer , lba , count ); 
172}
173
174/////////////////////////////////////////////
175error_t dev_ioc_sync_read( uint8_t  * buffer,
176                           uint32_t   lba,
177                           uint32_t   count )
178{
179    // get pointer on calling thread
180    thread_t * this = CURRENT_THREAD;
181
182    // software L2/L3 cache coherence for memory buffer
183    if( chdev_dir.iob ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
184
185    // get extended pointer on IOC[0] chdev
186    xptr_t  dev_xp = chdev_dir.ioc[0];
187
188    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined IOC chdev descriptor" );
189
190    // register command in calling thread descriptor
191    this->command.ioc.dev_xp    = dev_xp;
192    this->command.ioc.type      = IOC_SYNC_READ;
193    this->command.ioc.buf_xp    = XPTR( local_cxy , buffer );
194    this->command.ioc.lba       = lba;
195    this->command.ioc.count     = count;
196
197    // get driver command function
198    cxy_t       dev_cxy = GET_CXY( dev_xp );
199    chdev_t   * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
200    dev_cmd_t * cmd = (dev_cmd_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->cmd ) );
201
202    // mask the IRQ
203    thread_t * server = (thread_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->server ) );
204    core_t   * core = (core_t *)hal_remote_lpt( XPTR( dev_cxy , &server->core ) );
205    lid_t      lid = (lid_t)hal_remote_lw( XPTR( dev_cxy , &core->lid ) );
206    dev_pic_disable_irq( lid , dev_xp );
207
208    // call directly driver command
209    cmd( XPTR( local_cxy , this ) );
210
211    // unmask the IRQ
212    dev_pic_enable_irq( lid , dev_xp );
213
214    // return I/O operation status from calling thread descriptor
215    return this->command.ioc.error;
216}
217
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