source: trunk/kernel/devices/dev_ioc.c @ 213

Last change on this file since 213 was 213, checked in by max@…, 5 years ago

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