source: trunk/kernel/devices/dev_ioc.c @ 14

Last change on this file since 14 was 14, checked in by alain, 5 years ago

Bugs fix.

File size: 6.5 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-kernel; 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 <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>
34#include <chdev.h>
35#include <dev_ioc.h>
36
37/////////////////////////////////////////////////////////////////////////////////////////
38// Extern global variables
39/////////////////////////////////////////////////////////////////////////////////////////
40
41extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c
42
43extern chdev_pic_input_t  chdev_pic_input;   // allocated in kernel_init.c
44
45////////////////////////////////////
46void dev_ioc_init( chdev_t * chdev )
47{
48    // the local ICU chdev must be initialized before the IOC chdev, because
49    // the IOC chdev initialisation requires allocation of a WTI from local ICU
50    xptr_t  icu_xp  = chdev_dir.icu[local_cxy];
51    assert( (icu_xp != XPTR_NULL) , __FUNCTION__ , "ICU not initialised before IOC" );
52
53    // get implementation and channel from chdev descriptor
54    uint32_t  impl    = chdev->impl;
55    uint32_t  channel = chdev->channel;
56
57    // set driver specific fields in chdev descriptor and call driver init function
58    if( impl == IMPL_IOC_BDV )
59    {
60        chdev->cmd = &soclib_bdv_cmd;
61        chdev->isr = &soclib_bdv_isr;
62        soclib_bdv_init( chdev );
63    }
64    else if( impl == IMPL_IOC_HBA )
65    {
66        chdev->cmd = &soclib_hba_command;
67        chdev->isr = &soclib_hba_isr;
68        soclib_hba_init( chdev );
69    }
70    else
71    {
72        assert( false , __FUNCTION__ , "undefined IOC device implementation" );
73    }
74
75    // get a WTI mailbox from local ICU
76    uint32_t wti_id = dev_icu_wti_alloc();
77
78    assert( (wti_id != -1) , __FUNCTION__ , "cannot allocate WTI mailbox" );
79
80    // select a core
81    lid_t lid = cluster_select_local_core();
82
83    // enable WTI IRQ and update WTI interrupt vector
84    dev_icu_enable_irq( lid , WTI_TYPE , wti_id , chdev );
85
86    // link IOC IRQ to WTI mailbox in PIC component
87    uint32_t irq_id = chdev_pic_input.ioc[channel];
88    dev_pic_bind_irq( irq_id , local_cxy , wti_id );
89
90    // create server thread
91    thread_t * new_thread;
92    error_t    error;
93
94    error = thread_kernel_create( &new_thread,
95                                  THREAD_DEV,
96                                  &chdev_sequencial_server,
97                                  chdev,
98                                  lid ); 
99    assert( (error == 0) , __FUNCTION__ , "cannot create server thread" );
100
101    // set "server" field in chdev descriptor
102    chdev->server = new_thread;
103   
104    // start server thread
105    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
106 
107}  // end dev_ioc_init()
108
109//////////////////////////////////////////////////////////////////////////////////
110// This static function is called by dev_ioc_read() & dev_ioc_write() functions.
111// It builds and registers the command in the calling thread descriptor, after
112// translation of buffer virtual address to physical address.
113// Then, it registers the calling thead in chdev waiting queue.
114// Finally it blocks on the THREAD_BLOCKED_DEV condition and deschedule.
115////////////////////////////////////i/////////////////////////////////////////////
116static error_t dev_ioc_access( bool_t    to_mem,
117                               char    * buffer,
118                               uint32_t  lba,
119                               uint32_t  count )
120{
121    thread_t * this = CURRENT_THREAD;              // pointer on client thread
122
123    error_t     error;
124    paddr_t     buf_paddr;
125
126    // Get buffer physical address
127    error = vmm_v2p_translate( CONFIG_KERNEL_IDENTITY , buffer , &buf_paddr );
128 
129    if( error )  return EINVAL;
130
131    ioc_dmsg("\n[INFO] in %s : thread %x in process %x"
132             " for lba = %x / vaddr = %x / paddr = %l / at cycle %d\n", 
133             __FUNCTION__ , this->trdid , this->process->pid , 
134             lba , (uint32_t)buffer , buf_paddr , hal_time_stamp() );
135
136#if USE_IOB    // software L2/L3 cache coherence for memory buffer
137
138    if ( to_mem )  dev_mmc_inval( buf_paddr, count<<9 );
139    else           dev_mmc_sync( buf_paddr, count<<9 );
140
141#endif     // end software L2/L3 cache coherence
142
143    // get extended pointer on IOC chdev descriptor
144    xptr_t  dev_xp = chdev_dir.ioc[0];
145
146    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined IOC chdev descriptor" );
147
148    // register command in calling thread descriptor
149    this->command.ioc.dev_xp    = dev_xp;
150    this->command.ioc.to_mem    = to_mem;
151    this->command.ioc.buf_xp    = XPTR( local_cxy , buffer );
152    this->command.ioc.lba       = lba;
153    this->command.ioc.count     = count;
154
155    // register client thread in IOC chdev waiting queue, activate server thread,
156    // block client thread on THREAD_BLOCKED_IO and deschedule.
157    // it is re-activated by the ISR signaling IO operation completion.
158    chdev_register_command( dev_xp , this );
159
160    ioc_dmsg("\n[INFO] in %s : thread %x in process %x"
161             " completes / error = %d / at cycle %d\n", 
162             __FUNCTION__ , this->trdid , this->process->pid ,
163             this->dev.ioc.error , hal_time_stamp() );
164
165    // return I/O operation status
166    return this->command.ioc.error; 
167
168}  // end dev_ioc_access()
169
170////////////////////////////////////////////
171error_t dev_ioc_read( char         * buffer,
172                      uint32_t       lba,
173                      uint32_t       count )
174{
175    return dev_ioc_access( true , buffer , lba , count ); 
176} 
177
178////////////////////////////////////////////
179error_t dev_ioc_write( char         * buffer,
180                       uint32_t       lba,
181                       uint32_t       count )
182{
183    return dev_ioc_access( false , buffer , lba , count ); 
184}
Note: See TracBrowser for help on using the repository browser.