source: trunk/kernel/devices/dev_ioc.c @ 211

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[1]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
[14]24#include <kernel_config.h>
[1]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>
[3]34#include <chdev.h>
[1]35#include <dev_ioc.h>
36
37/////////////////////////////////////////////////////////////////////////////////////////
38// Extern global variables
39/////////////////////////////////////////////////////////////////////////////////////////
40
[188]41extern chdev_directory_t  chdev_dir;     // allocated in kernel_init.c
[1]42
[188]43//////////////////////////////////
44void dev_ioc_init( chdev_t * ioc )
[1]45{
[188]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;
[1]49
[188]50    assert( (pic_xp != XPTR_NULL) , __FUNCTION__ , "PIC not initialised before IOC" );
51
[3]52    // get implementation and channel from chdev descriptor
[188]53    uint32_t  impl    = ioc->impl;
54    uint32_t  channel = ioc->channel;
[1]55
[23]56    // set chdev name
[188]57    snprintf( ioc->name , 16 , "ioc_%d" , channel );
[23]58
[211]59    // call driver init function
[1]60    if( impl == IMPL_IOC_BDV )
61    {
[188]62        soclib_bdv_init( ioc );
[1]63    }
64    else if( impl == IMPL_IOC_HBA )
65    {
[188]66        soclib_hba_init( ioc );
[1]67    }
68    else
69    {
[3]70        assert( false , __FUNCTION__ , "undefined IOC device implementation" );
[1]71    }
72
[188]73    // select a core to execute the IOC server thread
[3]74    lid_t lid = cluster_select_local_core();
75
[188]76    // bind the IOC IRQ to the selected core
77    dev_pic_bind_irq( lid , ioc );
[3]78
[188]79    // enable IRQ
80    dev_pic_enable_irq( lid ,ioc );
[3]81
[1]82    // create server thread
[3]83    thread_t * new_thread;
[1]84    error_t    error;
85
[3]86    error = thread_kernel_create( &new_thread,
87                                  THREAD_DEV,
88                                  &chdev_sequencial_server,
[188]89                                  ioc,
[3]90                                  lid ); 
[188]91
[3]92    assert( (error == 0) , __FUNCTION__ , "cannot create server thread" );
[1]93
[188]94    // set "server" field in ioc descriptor
95    ioc->server = new_thread;
[1]96   
97    // start server thread
[3]98    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
[1]99 
100}  // end dev_ioc_init()
101
102//////////////////////////////////////////////////////////////////////////////////
103// This static function is called by dev_ioc_read() & dev_ioc_write() functions.
[23]104// It builds and registers the command in the calling thread descriptor.
[3]105// Then, it registers the calling thead in chdev waiting queue.
[1]106// Finally it blocks on the THREAD_BLOCKED_DEV condition and deschedule.
107////////////////////////////////////i/////////////////////////////////////////////
[23]108static error_t dev_ioc_access( uint32_t   cmd_type,
109                               uint8_t  * buffer,
110                               uint32_t   lba,
111                               uint32_t   count )
[1]112{
[3]113    thread_t * this = CURRENT_THREAD;              // pointer on client thread
[1]114
115    ioc_dmsg("\n[INFO] in %s : thread %x in process %x"
[23]116             " for lba = %x / buffer = %x / at cycle %d\n", 
[1]117             __FUNCTION__ , this->trdid , this->process->pid , 
[101]118             lba , (intptr_t)buffer , hal_get_cycles() );
[1]119
[68]120    // software L2/L3 cache coherence for memory buffer
121    if( chdev_dir.iob ) 
122    {
123        if ( cmd_type == IOC_READ ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
124        else                        dev_mmc_sync ( XPTR( local_cxy , buffer ) , count<<9 );
125    }
[1]126
[3]127    // get extended pointer on IOC chdev descriptor
128    xptr_t  dev_xp = chdev_dir.ioc[0];
[1]129
[3]130    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined IOC chdev descriptor" );
[1]131
[3]132    // register command in calling thread descriptor
133    this->command.ioc.dev_xp    = dev_xp;
[23]134    this->command.ioc.type      = cmd_type;
[3]135    this->command.ioc.buf_xp    = XPTR( local_cxy , buffer );
136    this->command.ioc.lba       = lba;
137    this->command.ioc.count     = count;
[1]138
[3]139    // register client thread in IOC chdev waiting queue, activate server thread,
[1]140    // block client thread on THREAD_BLOCKED_IO and deschedule.
141    // it is re-activated by the ISR signaling IO operation completion.
[3]142    chdev_register_command( dev_xp , this );
[1]143
[3]144    ioc_dmsg("\n[INFO] in %s : thread %x in process %x"
145             " completes / error = %d / at cycle %d\n", 
146             __FUNCTION__ , this->trdid , this->process->pid ,
[101]147             this->command.ioc.error , hal_get_cycles() );
[1]148
149    // return I/O operation status
[3]150    return this->command.ioc.error; 
[1]151
152}  // end dev_ioc_access()
153
154////////////////////////////////////////////
[23]155error_t dev_ioc_read( uint8_t      * buffer,
[1]156                      uint32_t       lba,
157                      uint32_t       count )
158{
[23]159    return dev_ioc_access( IOC_READ , buffer , lba , count ); 
[1]160} 
161
162////////////////////////////////////////////
[23]163error_t dev_ioc_write( uint8_t     * buffer,
164                       uint32_t      lba,
165                       uint32_t      count )
[1]166{
[23]167    return dev_ioc_access( IOC_WRITE , buffer , lba , count ); 
[1]168}
[23]169
170/////////////////////////////////////////////
171error_t dev_ioc_sync_read( uint8_t  * buffer,
172                           uint32_t   lba,
173                           uint32_t   count )
174{
175    // get pointer on calling thread
176    thread_t * this = CURRENT_THREAD;
177
[68]178    // software L2/L3 cache coherence for memory buffer
179    if( chdev_dir.iob ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
[23]180
181    // get extended pointer on IOC[0] chdev
182    xptr_t  dev_xp = chdev_dir.ioc[0];
183
184    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined IOC chdev descriptor" );
185
186    // register command in calling thread descriptor
187    this->command.ioc.dev_xp    = dev_xp;
188    this->command.ioc.type      = IOC_SYNC_READ;
189    this->command.ioc.buf_xp    = XPTR( local_cxy , buffer );
190    this->command.ioc.lba       = lba;
191    this->command.ioc.count     = count;
192
193    // get driver command function
194    cxy_t       dev_cxy = GET_CXY( dev_xp );
195    chdev_t   * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
196    dev_cmd_t * cmd = (dev_cmd_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->cmd ) );
197
[207]198    // mask the IRQ
199    thread_t * server = (thread_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->server ) );
200    core_t   * core = (core_t *)hal_remote_lpt( XPTR( dev_cxy , &server->core ) );
201    lid_t      lid = (lid_t)hal_remote_lw( XPTR( dev_cxy , &core->lid ) );
202    dev_pic_disable_irq( lid , dev_xp );
203
[23]204    // call directly driver command
205    cmd( XPTR( local_cxy , this ) );
206
[207]207    // unmask the IRQ
208    dev_pic_enable_irq( lid , dev_xp );
209
[23]210    // return I/O operation status from calling thread descriptor
211    return this->command.ioc.error;
212}
213
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