source: trunk/kernel/devices/dev_dma.c

Last change on this file was 674, checked in by alain, 3 years ago

1) Introduce up to 4 command lines arguments in the KSH "load" command.
These arguments are transfered to the user process through the
argc/argv mechanism, using the user space "args" vseg.

2) Introduce the named and anonymous "pipes", for inter-process communication
through the pipe() and mkfifo() syscalls.

3) Introduce the "chat" application to validate the two above mechanisms.

4) Improve printk() and assert() fonctions in printk.c.

File size: 5.7 KB
Line 
1/*
2 * dev_dma.c - DMA (Interrupt Controler Unit) generic device API implementation.
3 *
4 * Authors   Alain Greiner  (2016,2017,2018,2019,2020)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
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 PARTDMALAR 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 <hal_kernel_types.h>
25#include <hal_special.h>
26#include <chdev.h>
27#include <thread.h>
28#include <cluster.h>
29#include <printk.h>
30#include <memcpy.h>
31#include <dev_dma.h>
32#include <hal_drivers.h>
33
34/////////////////////////////////////////////////////////////////////////////////////////
35// Extern global variables
36/////////////////////////////////////////////////////////////////////////////////////////
37
38extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c
39
40//////////////////////////////////
41void dev_dma_init( chdev_t * dma )
42{
43    // get channel from chdev descriptor
44    uint32_t channel = dma->channel;
45
46    // set dma name
47    snprintk( dma->name , 16 , "dma%d_%x" , channel , local_cxy );
48
49    // call driver init function
50    hal_drivers_dma_init( dma );
51
52    // bind IRQ to the core defined by the DMA channel
53    dev_pic_bind_irq( channel , dma );
54
55    // enable IRQ
56    dev_pic_enable_irq( channel, XPTR( local_cxy , dma ) );
57
58    // create server thread
59    thread_t * new_thread;
60    error_t    error;
61
62    lid_t lid = cluster_select_local_core( local_cxy );
63
64    error = thread_kernel_create( &new_thread,
65                                  THREAD_DEV,
66                                  &chdev_server_func,
67                                  dma,
68                                  lid );
69    if( error )
70    {
71        assert( __FUNCTION__, false , "cannot create server thread" );
72    }
73
74    // initialises server field in chdev descriptor
75    dma->server = new_thread;
76
77    // initializes chdev field in thread descriptor
78    new_thread->chdev = dma;
79   
80    // unblock server thread
81    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
82
83} // dev_dma_init()
84
85////////////////////////////////////////////////
86error_t dev_dma_async_memcpy( xptr_t    dst_xp,
87                              xptr_t    src_xp,
88                              uint32_t  size )
89{
90    thread_t * this = CURRENT_THREAD;
91
92#if DEBUG_DEV_DMA
93uint32_t cycle = (uint32_t)hal_get_cycles();
94if( CONGIG_DEBUG_DEV_DMA < cycle )
95printk("\n[DBG] %s : thread %x enters / dst %l / src %l / size = %x\n",
96__FUNCTION__ , this, dst_xp, src_xp, size );
97#endif
98
99    // select DMA channel corresponding to core lid
100    uint32_t channel = this->core->lid;
101
102    // get extended pointer on selected DMA chdev descriptor
103    xptr_t  dev_xp = chdev_dir.dma[channel];
104
105// check DMA chdev definition
106assert( __FUNCTION__, (dev_xp != XPTR_NULL) , "undefined DMA chdev descriptor" );
107
108    // register command in calling thread descriptor
109    this->dma_cmd.sync    = false;
110    this->dma_cmd.dev_xp  = dev_xp;
111    this->dma_cmd.dst_xp  = dst_xp;
112    this->dma_cmd.src_xp  = src_xp;
113    this->dma_cmd.size    = size;
114
115    // register the client thread in waiting queue, activate the server thread,
116    // block the client thread on THREAD_BLOCKED_IO, and deschedule.
117    // it is re-activated by the server thread  when the transfer is completed.
118    chdev_register_command( dev_xp );
119
120#if DEBUG_DEV_DMA
121cycle = (uint32_t)hal_get_cycles();
122if( CONGIG_DEBUG_DEV_DMA < cycle )
123printk("\n[DBG] %s : thread %x exit / dst %l / src %l / size = %x\n",
124__FUNCTION__ , this, dst_xp, src_xp, size );
125#endif
126
127    // return I/O operation status from calling thread descriptor
128    return this->dma_cmd.error; 
129
130}  // dev_dma_async_memcpy()
131
132//////////////////////////////////////////////
133error_t dev_dma_sync_memcpy( xptr_t    dst_xp,
134                             xptr_t    src_xp,
135                             uint32_t  size )
136{
137    thread_t * this = CURRENT_THREAD;
138
139#if DEBUG_DEV_DMA
140uint32_t cycle = (uint32_t)hal_get_cycles();
141if( CONGIG_DEBUG_DEV_DMA < cycle )
142printk("\n[DBG] %s : thread %x enters / dst %l / src %l / size = %x\n",
143__FUNCTION__ , this, dst_xp, src_xp, size );
144#endif
145
146    // select DMA channel corresponding to core lid
147    uint32_t channel = this->core->lid;
148
149    // get extended pointer on selected DMA chdev descriptor
150    xptr_t  dev_xp = chdev_dir.dma[channel];
151
152// check DMA chdev definition
153assert( __FUNCTION__, (dev_xp != XPTR_NULL) , "undefined DMA chdev descriptor" );
154
155    // register command in calling thread descriptor
156    this->dma_cmd.sync    = true;
157    this->dma_cmd.dev_xp  = dev_xp;
158    this->dma_cmd.dst_xp  = dst_xp;
159    this->dma_cmd.src_xp  = src_xp;
160    this->dma_cmd.size    = size;
161
162    // get driver command function
163    cxy_t       dev_cxy = GET_CXY( dev_xp );
164    chdev_t   * dev_ptr = GET_PTR( dev_xp );
165    dev_cmd_t * cmd = (dev_cmd_t *)hal_remote_lpt( XPTR( dev_cxy , &dev_ptr->cmd ) );
166
167    // call directly the blocking driver function
168    cmd( XPTR( local_cxy , this ) );
169
170#if DEBUG_DEV_DMA
171cycle = (uint32_t)hal_get_cycles();
172if( CONGIG_DEBUG_DEV_DMA < cycle )
173printk("\n[DBG] %s : thread %x exit / dst %l / src %l / size = %x\n",
174__FUNCTION__ , this, dst_xp, src_xp, size );
175#endif
176
177    // return I/O operation status from calling thread descriptor
178    return this->dma_cmd.error; 
179
180}  // dev_dma_sync_memcpy()
181
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