source: trunk/kernel/devices/dev_ioc.c @ 565

Last change on this file since 565 was 565, checked in by alain, 3 years ago

Complete restructuration of kernel locks.

File size: 7.9 KB
RevLine 
[1]1/*
2 * dev_ioc.c - IOC (Block Device Controler) generic device API implementation.
[212]3 *
[437]4 * Author  Alain Greiner    (2016,2017,2018)
[1]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>
[457]25#include <hal_kernel_types.h>
[1]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
[492]46    assert( (pic_xp != XPTR_NULL) , "PIC not initialised before IOC" );
[188]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
[407]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
[492]77    assert( (error == 0) , "cannot create server thread" );
[1]78
[408]79    // set "server" field in chdev descriptor
[188]80    ioc->server = new_thread;
[212]81
[408]82    // set "chdev field in thread descriptor
83    new_thread->chdev = ioc;
84
85    // unblock server thread
[3]86    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
[212]87
[1]88}  // end dev_ioc_init()
89
90//////////////////////////////////////////////////////////////////////////////////
91// This static function is called by dev_ioc_read() & dev_ioc_write() functions.
[23]92// It builds and registers the command in the calling thread descriptor.
[440]93// Then, it registers the calling thead in IOCchdev waiting queue.
[407]94// Finally it blocks on the THREAD_BLOCKED_IO condition and deschedule.
[1]95////////////////////////////////////i/////////////////////////////////////////////
[23]96static error_t dev_ioc_access( uint32_t   cmd_type,
97                               uint8_t  * buffer,
98                               uint32_t   lba,
99                               uint32_t   count )
[1]100{
[3]101    thread_t * this = CURRENT_THREAD;              // pointer on client thread
[1]102
[212]103    // software L2/L3 cache coherence for memory buffer
104    if( chdev_dir.iob )
[68]105    {
106        if ( cmd_type == IOC_READ ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
107        else                        dev_mmc_sync ( XPTR( local_cxy , buffer ) , count<<9 );
108    }
[1]109
[3]110    // get extended pointer on IOC chdev descriptor
111    xptr_t  dev_xp = chdev_dir.ioc[0];
[1]112
[492]113    assert( (dev_xp != XPTR_NULL) , "undefined IOC chdev descriptor" );
[1]114
[3]115    // register command in calling thread descriptor
[279]116    this->ioc_cmd.dev_xp    = dev_xp;
117    this->ioc_cmd.type      = cmd_type;
118    this->ioc_cmd.buf_xp    = XPTR( local_cxy , buffer );
119    this->ioc_cmd.lba       = lba;
120    this->ioc_cmd.count     = count;
[1]121
[3]122    // register client thread in IOC chdev waiting queue, activate server thread,
[1]123    // block client thread on THREAD_BLOCKED_IO and deschedule.
124    // it is re-activated by the ISR signaling IO operation completion.
[407]125    chdev_register_command( dev_xp );
[1]126
127    // return I/O operation status
[279]128    return this->ioc_cmd.error;
[1]129
130}  // end dev_ioc_access()
131
132////////////////////////////////////////////
[23]133error_t dev_ioc_read( uint8_t      * buffer,
[1]134                      uint32_t       lba,
135                      uint32_t       count )
136{
[437]137
[438]138#if DEBUG_DEV_IOC_RX
[437]139uint32_t cycle = (uint32_t)hal_get_cycles();
[438]140if( DEBUG_DEV_IOC_RX < cycle )
[437]141printk("\n[DBG] %s : thread %x enters / lba  %x / buffer %x / cycle %d\n",
142__FUNCTION__ , this, lba, buffer, cycle );
143#endif
144
[212]145    return dev_ioc_access( IOC_READ , buffer , lba , count );
[437]146
[438]147#if DEBUG_DEV_IOC_RX
[437]148cycle = (uint32_t)hal_get_cycles();
[438]149if( DEBUG_DEV_IOC_RX < cycle )
[437]150printk("\n[DBG] %s : thread %x exit / lba  %x / buffer %x / cycle %d\n",
151__FUNCTION__ , this, lba, buffer, cycle );
152#endif
153
[212]154}
[1]155
156////////////////////////////////////////////
[23]157error_t dev_ioc_write( uint8_t     * buffer,
158                       uint32_t      lba,
159                       uint32_t      count )
[1]160{
[437]161
[438]162#if DEBUG_DEV_IOC_TX
[437]163uint32_t cycle = (uint32_t)hal_get_cycles();
[438]164if( DEBUG_DEV_IOC_TX < cycle )
[437]165printk("\n[DBG] %s : thread %x enters / lba  %x / buffer %x / cycle %d\n",
166__FUNCTION__ , this, lba, buffer, cycle );
167#endif
168
[212]169    return dev_ioc_access( IOC_WRITE , buffer , lba , count );
[437]170
[438]171#if DEBUG_DEV_IOC_TX
[437]172cycle = (uint32_t)hal_get_cycles();
[438]173if( DEBUG_DEV_IOC_TX < cycle )
[437]174printk("\n[DBG] %s : thread %x exit / lba  %x / buffer %x / cycle %d\n",
175__FUNCTION__ , this, lba, buffer, cycle );
176#endif
177
[1]178}
[23]179
180/////////////////////////////////////////////
181error_t dev_ioc_sync_read( uint8_t  * buffer,
182                           uint32_t   lba,
183                           uint32_t   count )
184{
[212]185    // get pointer on calling thread
[23]186    thread_t * this = CURRENT_THREAD;
187
[438]188#if DEBUG_DEV_IOC_RX
[437]189uint32_t cycle = (uint32_t)hal_get_cycles();
[438]190if( DEBUG_DEV_IOC_RX < cycle )
[437]191printk("\n[DBG] %s : thread %x enters / lba  %x / buffer %x / cycle %d\n",
192__FUNCTION__ , this, lba, buffer, cycle );
193#endif
[401]194
[212]195    // software L2/L3 cache coherence for memory buffer
[68]196    if( chdev_dir.iob ) dev_mmc_inval( XPTR( local_cxy , buffer ) , count<<9 );
[23]197
[212]198    // get extended pointer on IOC[0] chdev
[279]199    xptr_t  ioc_xp = chdev_dir.ioc[0];
[23]200
[492]201    assert( (ioc_xp != XPTR_NULL) , "undefined IOC chdev descriptor" );
[23]202
203    // register command in calling thread descriptor
[279]204    this->ioc_cmd.dev_xp    = ioc_xp;
205    this->ioc_cmd.type      = IOC_SYNC_READ;
206    this->ioc_cmd.buf_xp    = XPTR( local_cxy , buffer );
207    this->ioc_cmd.lba       = lba;
208    this->ioc_cmd.count     = count;
[23]209
[212]210    // get driver command function
[279]211    cxy_t       ioc_cxy = GET_CXY( ioc_xp );
212    chdev_t   * ioc_ptr = (chdev_t *)GET_PTR( ioc_xp );
213    dev_cmd_t * cmd = (dev_cmd_t *)hal_remote_lpt( XPTR( ioc_cxy , &ioc_ptr->cmd ) );
[23]214
[279]215    // get core local index for the core handling the IOC IRQ
216    thread_t * server = (thread_t *)hal_remote_lpt( XPTR( ioc_cxy , &ioc_ptr->server ) );
217    core_t   * core   = (core_t *)hal_remote_lpt( XPTR( ioc_cxy , &server->core ) );
[565]218    lid_t      lid    = (lid_t)hal_remote_l32( XPTR( ioc_cxy , &core->lid ) );
[279]219
[207]220    // mask the IRQ
[279]221    dev_pic_disable_irq( lid , ioc_xp );
[207]222
[279]223    // call driver function
[23]224    cmd( XPTR( local_cxy , this ) );
225
[207]226    // unmask the IRQ
[279]227    dev_pic_enable_irq( lid , ioc_xp );
[207]228
[438]229#if DEBUG_DEV_IOC_RX
[437]230cycle = (uint32_t)hal_get_cycles();
[438]231if( DEBUG_DEV_IOC_RX < cycle )
[437]232printk("\n[DBG] %s : thread %x exit / lba  %x / buffer %x / cycle %d\n",
233__FUNCTION__ , this, lba, buffer, cycle );
234#endif
[279]235
[23]236    // return I/O operation status from calling thread descriptor
[279]237    return this->ioc_cmd.error;
[23]238
[279]239}  // end ioc_sync_read()
240
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