source: trunk/kernel/devices/dev_ioc.c @ 216

Last change on this file since 216 was 216, checked in by max@…, 5 years ago

dispatch 'impl' in the hal

File size: 7.0 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 ,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 ioc descriptor
80    ioc->server = new_thread;
81
82    // start server thread
83    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
84
85}  // end dev_ioc_init()
86
87//////////////////////////////////////////////////////////////////////////////////
88// This static function is called by dev_ioc_read() & dev_ioc_write() functions.
89// It builds and registers the command in the calling thread descriptor.
90// Then, it registers the calling thead in chdev waiting queue.
91// Finally it blocks on the THREAD_BLOCKED_DEV condition and deschedule.
92////////////////////////////////////i/////////////////////////////////////////////
93static error_t dev_ioc_access( uint32_t   cmd_type,
94                               uint8_t  * buffer,
95                               uint32_t   lba,
96                               uint32_t   count )
97{
98    thread_t * this = CURRENT_THREAD;              // pointer on client thread
99
100    ioc_dmsg("\n[INFO] in %s : thread %x in process %x"
101             " for lba = %x / buffer = %x / at cycle %d\n",
102             __FUNCTION__ , this->trdid , this->process->pid ,
103             lba , (intptr_t)buffer , hal_get_cycles() );
104
105    // software L2/L3 cache coherence for memory buffer
106    if( chdev_dir.iob )
107    {
108        if ( cmd_type == IOC_READ ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
109        else                        dev_mmc_sync ( XPTR( local_cxy , buffer ) , count<<9 );
110    }
111
112    // get extended pointer on IOC chdev descriptor
113    xptr_t  dev_xp = chdev_dir.ioc[0];
114
115    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined IOC chdev descriptor" );
116
117    // register command in calling thread descriptor
118    this->command.ioc.dev_xp    = dev_xp;
119    this->command.ioc.type      = cmd_type;
120    this->command.ioc.buf_xp    = XPTR( local_cxy , buffer );
121    this->command.ioc.lba       = lba;
122    this->command.ioc.count     = count;
123
124    // register client thread in IOC chdev waiting queue, activate server thread,
125    // block client thread on THREAD_BLOCKED_IO and deschedule.
126    // it is re-activated by the ISR signaling IO operation completion.
127    chdev_register_command( dev_xp , this );
128
129    ioc_dmsg("\n[INFO] in %s : thread %x in process %x"
130             " completes / error = %d / at cycle %d\n",
131             __FUNCTION__ , this->trdid , this->process->pid ,
132             this->command.ioc.error , hal_get_cycles() );
133
134    // return I/O operation status
135    return this->command.ioc.error;
136
137}  // end dev_ioc_access()
138
139////////////////////////////////////////////
140error_t dev_ioc_read( uint8_t      * buffer,
141                      uint32_t       lba,
142                      uint32_t       count )
143{
144    return dev_ioc_access( IOC_READ , buffer , lba , count );
145}
146
147////////////////////////////////////////////
148error_t dev_ioc_write( uint8_t     * buffer,
149                       uint32_t      lba,
150                       uint32_t      count )
151{
152    return dev_ioc_access( IOC_WRITE , buffer , lba , count );
153}
154
155/////////////////////////////////////////////
156error_t dev_ioc_sync_read( uint8_t  * buffer,
157                           uint32_t   lba,
158                           uint32_t   count )
159{
160    // get pointer on calling thread
161    thread_t * this = CURRENT_THREAD;
162
163    // software L2/L3 cache coherence for memory buffer
164    if( chdev_dir.iob ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
165
166    // get extended pointer on IOC[0] chdev
167    xptr_t  dev_xp = chdev_dir.ioc[0];
168
169    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined IOC chdev descriptor" );
170
171    // register command in calling thread descriptor
172    this->command.ioc.dev_xp    = dev_xp;
173    this->command.ioc.type      = IOC_SYNC_READ;
174    this->command.ioc.buf_xp    = XPTR( local_cxy , buffer );
175    this->command.ioc.lba       = lba;
176    this->command.ioc.count     = count;
177
178    // get driver command function
179    cxy_t       dev_cxy = GET_CXY( dev_xp );
180    chdev_t   * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
181    dev_cmd_t * cmd = (dev_cmd_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->cmd ) );
182
183    // mask the IRQ
184    thread_t * server = (thread_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->server ) );
185    core_t   * core = (core_t *)hal_remote_lpt( XPTR( dev_cxy , &server->core ) );
186    lid_t      lid = (lid_t)hal_remote_lw( XPTR( dev_cxy , &core->lid ) );
187    dev_pic_disable_irq( lid , dev_xp );
188
189    // call directly driver command
190    cmd( XPTR( local_cxy , this ) );
191
192    // unmask the IRQ
193    dev_pic_enable_irq( lid , dev_xp );
194
195    // return I/O operation status from calling thread descriptor
196    return this->command.ioc.error;
197}
198
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