source: trunk/kernel/devices/dev_ioc.c @ 411

Last change on this file since 411 was 408, checked in by alain, 5 years ago

Fix several bugs in the fork() syscall.

File size: 7.5 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-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 <thread.h>
29#include <printk.h>
30#include <chdev.h>
31#include <dev_ioc.h>
32
33/////////////////////////////////////////////////////////////////////////////////////////
34// Extern global variables
35/////////////////////////////////////////////////////////////////////////////////////////
36
37extern chdev_directory_t  chdev_dir;     // allocated in kernel_init.c
38
39//////////////////////////////////
40void dev_ioc_init( chdev_t * ioc )
41{
42    // the PIC chdev must be initialized before the IOC chdev, because
43    // the IOC chdev initialisation requires the routing of an external IRQ
44    xptr_t  pic_xp  = chdev_dir.pic;
45
46    assert( (pic_xp != XPTR_NULL) , __FUNCTION__ , "PIC not initialised before IOC" );
47
48    // get implementation and channel from chdev descriptor
49    uint32_t  impl    = ioc->impl;
50    uint32_t  channel = ioc->channel;
51
52    // set chdev name
53    snprintf( ioc->name , 16 , "ioc%d" , channel );
54
55    // call driver init function
56    hal_drivers_ioc_init( ioc, impl );
57
58    // select a core to execute the IOC server thread
59    lid_t lid = cluster_select_local_core();
60
61    // bind the IOC IRQ to the selected core
62    dev_pic_bind_irq( lid , ioc );
63
64    // enable IRQ
65    dev_pic_enable_irq( lid , XPTR( local_cxy , ioc ) );
66
67    // create server thread
68    thread_t * new_thread;
69    error_t    error;
70
71    error = thread_kernel_create( &new_thread,
72                                  THREAD_DEV,
73                                  &chdev_sequencial_server,
74                                  ioc,
75                                  lid );
76
77    assert( (error == 0) , __FUNCTION__ , "cannot create server thread" );
78
79    // set "server" field in chdev descriptor
80    ioc->server = new_thread;
81
82    // set "chdev field in thread descriptor
83    new_thread->chdev = ioc;
84
85    // unblock server thread
86    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
87
88}  // end dev_ioc_init()
89
90//////////////////////////////////////////////////////////////////////////////////
91// This static function is called by dev_ioc_read() & dev_ioc_write() functions.
92// It builds and registers the command in the calling thread descriptor.
93// Then, it registers the calling thead in chdev waiting queue.
94// Finally it blocks on the THREAD_BLOCKED_IO condition and deschedule.
95////////////////////////////////////i/////////////////////////////////////////////
96static error_t dev_ioc_access( uint32_t   cmd_type,
97                               uint8_t  * buffer,
98                               uint32_t   lba,
99                               uint32_t   count )
100{
101    thread_t * this = CURRENT_THREAD;              // pointer on client thread
102
103    ioc_dmsg("\n[DBG] %s : thread %x in process %x"
104             " for lba = %x / buffer = %x / at cycle %d\n",
105             __FUNCTION__ , this->trdid , this->process->pid ,
106             lba , (intptr_t)buffer , hal_get_cycles() );
107
108    // software L2/L3 cache coherence for memory buffer
109    if( chdev_dir.iob )
110    {
111        if ( cmd_type == IOC_READ ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
112        else                        dev_mmc_sync ( XPTR( local_cxy , buffer ) , count<<9 );
113    }
114
115    // get extended pointer on IOC chdev descriptor
116    xptr_t  dev_xp = chdev_dir.ioc[0];
117
118    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined IOC chdev descriptor" );
119
120    // register command in calling thread descriptor
121    this->ioc_cmd.dev_xp    = dev_xp;
122    this->ioc_cmd.type      = cmd_type;
123    this->ioc_cmd.buf_xp    = XPTR( local_cxy , buffer );
124    this->ioc_cmd.lba       = lba;
125    this->ioc_cmd.count     = count;
126
127    // register client thread in IOC chdev waiting queue, activate server thread,
128    // block client thread on THREAD_BLOCKED_IO and deschedule.
129    // it is re-activated by the ISR signaling IO operation completion.
130    chdev_register_command( dev_xp );
131
132    ioc_dmsg("\n[DBG] in %s : thread %x in process %x"
133             " completes / error = %d / at cycle %d\n",
134             __FUNCTION__ , this->trdid , this->process->pid ,
135             this->ioc_cmd.error , hal_get_cycles() );
136
137    // return I/O operation status
138    return this->ioc_cmd.error;
139
140}  // end dev_ioc_access()
141
142////////////////////////////////////////////
143error_t dev_ioc_read( uint8_t      * buffer,
144                      uint32_t       lba,
145                      uint32_t       count )
146{
147    return dev_ioc_access( IOC_READ , buffer , lba , count );
148}
149
150////////////////////////////////////////////
151error_t dev_ioc_write( uint8_t     * buffer,
152                       uint32_t      lba,
153                       uint32_t      count )
154{
155    return dev_ioc_access( IOC_WRITE , buffer , lba , count );
156}
157
158/////////////////////////////////////////////
159error_t dev_ioc_sync_read( uint8_t  * buffer,
160                           uint32_t   lba,
161                           uint32_t   count )
162{
163    // get pointer on calling thread
164    thread_t * this = CURRENT_THREAD;
165
166    ioc_dmsg("\n[DBG] %s : core[%x,%d] enter for %d blocks / lba = %x / cycle %d\n",
167    __FUNCTION__ , local_cxy , this->core->lid , count , lba , hal_time_stamp() );
168
169    // software L2/L3 cache coherence for memory buffer
170    if( chdev_dir.iob ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
171
172    // get extended pointer on IOC[0] chdev
173    xptr_t  ioc_xp = chdev_dir.ioc[0];
174
175    assert( (ioc_xp != XPTR_NULL) , __FUNCTION__ , "undefined IOC chdev descriptor" );
176
177    // register command in calling thread descriptor
178    this->ioc_cmd.dev_xp    = ioc_xp;
179    this->ioc_cmd.type      = IOC_SYNC_READ;
180    this->ioc_cmd.buf_xp    = XPTR( local_cxy , buffer );
181    this->ioc_cmd.lba       = lba;
182    this->ioc_cmd.count     = count;
183
184    // get driver command function
185    cxy_t       ioc_cxy = GET_CXY( ioc_xp );
186    chdev_t   * ioc_ptr = (chdev_t *)GET_PTR( ioc_xp );
187    dev_cmd_t * cmd = (dev_cmd_t *)hal_remote_lpt( XPTR( ioc_cxy , &ioc_ptr->cmd ) );
188
189    // get core local index for the core handling the IOC IRQ
190    thread_t * server = (thread_t *)hal_remote_lpt( XPTR( ioc_cxy , &ioc_ptr->server ) );
191    core_t   * core   = (core_t *)hal_remote_lpt( XPTR( ioc_cxy , &server->core ) );
192    lid_t      lid    = (lid_t)hal_remote_lw( XPTR( ioc_cxy , &core->lid ) );
193
194    // mask the IRQ
195    dev_pic_disable_irq( lid , ioc_xp );
196
197    // call driver function
198    cmd( XPTR( local_cxy , this ) );
199
200    // unmask the IRQ
201    dev_pic_enable_irq( lid , ioc_xp );
202
203    ioc_dmsg("\n[DBG] %s : core[%x,%d] exit / error = %d / cycle %d\n",
204    __FUNCTION__ , local_cxy , this->core->lid , this->ioc_cmd.error , hal_time_stamp() );
205
206    // return I/O operation status from calling thread descriptor
207    return this->ioc_cmd.error;
208
209}  // end ioc_sync_read()
210
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