source: trunk/kernel/devices/dev_ioc.c @ 395

Last change on this file since 395 was 296, checked in by alain, 7 years ago

Several modifs in the generic scheduler and in the hal_context to
fix the context switch mechanism.

File size: 7.3 KB
RevLine 
[1]1/*
2 * dev_ioc.c - IOC (Block Device Controler) generic device API implementation.
[212]3 *
[1]4 * Author  Alain Greiner    (2016)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MK
9 *
[212]10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
[1]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 *
[212]14 * ALMOS-MKH is distributed in the hope that it will be useful, but
[1]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
[212]20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
[1]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>
[213]27#include <hal_drivers.h>
[1]28#include <thread.h>
29#include <printk.h>
[3]30#include <chdev.h>
[1]31#include <dev_ioc.h>
32
33/////////////////////////////////////////////////////////////////////////////////////////
34// Extern global variables
35/////////////////////////////////////////////////////////////////////////////////////////
36
[188]37extern chdev_directory_t  chdev_dir;     // allocated in kernel_init.c
[1]38
[188]39//////////////////////////////////
40void dev_ioc_init( chdev_t * ioc )
[1]41{
[188]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;
[1]45
[188]46    assert( (pic_xp != XPTR_NULL) , __FUNCTION__ , "PIC not initialised before IOC" );
47
[3]48    // get implementation and channel from chdev descriptor
[188]49    uint32_t  impl    = ioc->impl;
50    uint32_t  channel = ioc->channel;
[1]51
[23]52    // set chdev name
[188]53    snprintf( ioc->name , 16 , "ioc_%d" , channel );
[23]54
[211]55    // call driver init function
[216]56    hal_drivers_ioc_init( ioc, impl );
[1]57
[188]58    // select a core to execute the IOC server thread
[3]59    lid_t lid = cluster_select_local_core();
60
[188]61    // bind the IOC IRQ to the selected core
62    dev_pic_bind_irq( lid , ioc );
[3]63
[188]64    // enable IRQ
[238]65    dev_pic_enable_irq( lid , XPTR( local_cxy , ioc ) );
[3]66
[1]67    // create server thread
[3]68    thread_t * new_thread;
[1]69    error_t    error;
70
[3]71    error = thread_kernel_create( &new_thread,
72                                  THREAD_DEV,
73                                  &chdev_sequencial_server,
[188]74                                  ioc,
[212]75                                  lid );
[188]76
[3]77    assert( (error == 0) , __FUNCTION__ , "cannot create server thread" );
[1]78
[188]79    // set "server" field in ioc descriptor
80    ioc->server = new_thread;
[212]81
[1]82    // start server thread
[296]83    thread_block( new_thread , THREAD_BLOCKED_DEV_QUEUE );
[3]84    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
[212]85
[1]86}  // end dev_ioc_init()
87
88//////////////////////////////////////////////////////////////////////////////////
89// This static function is called by dev_ioc_read() & dev_ioc_write() functions.
[23]90// It builds and registers the command in the calling thread descriptor.
[3]91// Then, it registers the calling thead in chdev waiting queue.
[1]92// Finally it blocks on the THREAD_BLOCKED_DEV condition and deschedule.
93////////////////////////////////////i/////////////////////////////////////////////
[23]94static error_t dev_ioc_access( uint32_t   cmd_type,
95                               uint8_t  * buffer,
96                               uint32_t   lba,
97                               uint32_t   count )
[1]98{
[3]99    thread_t * this = CURRENT_THREAD;              // pointer on client thread
[1]100
101    ioc_dmsg("\n[INFO] in %s : thread %x in process %x"
[212]102             " for lba = %x / buffer = %x / at cycle %d\n",
103             __FUNCTION__ , this->trdid , this->process->pid ,
[101]104             lba , (intptr_t)buffer , hal_get_cycles() );
[1]105
[212]106    // software L2/L3 cache coherence for memory buffer
107    if( chdev_dir.iob )
[68]108    {
109        if ( cmd_type == IOC_READ ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
110        else                        dev_mmc_sync ( XPTR( local_cxy , buffer ) , count<<9 );
111    }
[1]112
[3]113    // get extended pointer on IOC chdev descriptor
114    xptr_t  dev_xp = chdev_dir.ioc[0];
[1]115
[3]116    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined IOC chdev descriptor" );
[1]117
[3]118    // register command in calling thread descriptor
[279]119    this->ioc_cmd.dev_xp    = dev_xp;
120    this->ioc_cmd.type      = cmd_type;
121    this->ioc_cmd.buf_xp    = XPTR( local_cxy , buffer );
122    this->ioc_cmd.lba       = lba;
123    this->ioc_cmd.count     = count;
[1]124
[3]125    // register client thread in IOC chdev waiting queue, activate server thread,
[1]126    // block client thread on THREAD_BLOCKED_IO and deschedule.
127    // it is re-activated by the ISR signaling IO operation completion.
[3]128    chdev_register_command( dev_xp , this );
[1]129
[3]130    ioc_dmsg("\n[INFO] in %s : thread %x in process %x"
[212]131             " completes / error = %d / at cycle %d\n",
[3]132             __FUNCTION__ , this->trdid , this->process->pid ,
[279]133             this->ioc_cmd.error , hal_get_cycles() );
[1]134
135    // return I/O operation status
[279]136    return this->ioc_cmd.error;
[1]137
138}  // end dev_ioc_access()
139
140////////////////////////////////////////////
[23]141error_t dev_ioc_read( uint8_t      * buffer,
[1]142                      uint32_t       lba,
143                      uint32_t       count )
144{
[212]145    return dev_ioc_access( IOC_READ , buffer , lba , count );
146}
[1]147
148////////////////////////////////////////////
[23]149error_t dev_ioc_write( uint8_t     * buffer,
150                       uint32_t      lba,
151                       uint32_t      count )
[1]152{
[212]153    return dev_ioc_access( IOC_WRITE , buffer , lba , count );
[1]154}
[23]155
156/////////////////////////////////////////////
157error_t dev_ioc_sync_read( uint8_t  * buffer,
158                           uint32_t   lba,
159                           uint32_t   count )
160{
[279]161    ioc_dmsg("\n[INFO] %s : enter in cluster %x\n",
162             __FUNCTION__ , local_cxy );
163
[212]164    // get pointer on calling thread
[23]165    thread_t * this = CURRENT_THREAD;
166
[212]167    // software L2/L3 cache coherence for memory buffer
[68]168    if( chdev_dir.iob ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
[23]169
[212]170    // get extended pointer on IOC[0] chdev
[279]171    xptr_t  ioc_xp = chdev_dir.ioc[0];
[23]172
[279]173    assert( (ioc_xp != XPTR_NULL) , __FUNCTION__ , "undefined IOC chdev descriptor" );
[23]174
175    // register command in calling thread descriptor
[279]176    this->ioc_cmd.dev_xp    = ioc_xp;
177    this->ioc_cmd.type      = IOC_SYNC_READ;
178    this->ioc_cmd.buf_xp    = XPTR( local_cxy , buffer );
179    this->ioc_cmd.lba       = lba;
180    this->ioc_cmd.count     = count;
[23]181
[212]182    // get driver command function
[279]183    cxy_t       ioc_cxy = GET_CXY( ioc_xp );
184    chdev_t   * ioc_ptr = (chdev_t *)GET_PTR( ioc_xp );
185    dev_cmd_t * cmd = (dev_cmd_t *)hal_remote_lpt( XPTR( ioc_cxy , &ioc_ptr->cmd ) );
[23]186
[279]187    // get core local index for the core handling the IOC IRQ
188    thread_t * server = (thread_t *)hal_remote_lpt( XPTR( ioc_cxy , &ioc_ptr->server ) );
189    core_t   * core   = (core_t *)hal_remote_lpt( XPTR( ioc_cxy , &server->core ) );
190    lid_t      lid    = (lid_t)hal_remote_lw( XPTR( ioc_cxy , &core->lid ) );
191
[207]192    // mask the IRQ
[279]193    dev_pic_disable_irq( lid , ioc_xp );
[207]194
[279]195    // call driver function
[23]196    cmd( XPTR( local_cxy , this ) );
197
[207]198    // unmask the IRQ
[279]199    dev_pic_enable_irq( lid , ioc_xp );
[207]200
[279]201    ioc_dmsg("\n[INFO] %s : exit in cluster %x\n",
202             __FUNCTION__ , local_cxy );
203
[23]204    // return I/O operation status from calling thread descriptor
[279]205    return this->ioc_cmd.error;
[23]206
[279]207}  // end ioc_sync_read()
208
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