source: trunk/kernel/drivers/soclib/soclib_hba.c @ 51

Last change on this file since 51 was 23, checked in by alain, 7 years ago

Introduce syscalls.
File size: 10.6 KB
Line 
1/*
2 * soclib_hba.c - soclib AHCI block device driver implementation.
3 *
4 * Author     Alain Greiner (2016)
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 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-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 <printk.h>
25#include <hal_special.h>
26#include <chdev.h>
27#include <dev_ioc.h>
28#include <soclib_hba.h>
29#include <spinlock.h>
30#include <thread.h>
31
32//////////////////////////////////////////////////////////////////////////////////
33//   SOCLIB_HBA specific global variables
34//////////////////////////////////////////////////////////////////////////////////
35       
36// command list : up to 32 commands
37__attribute__((section(".kdata")))
38hba_cmd_desc_t     hba_cmd_list[32] __attribute__((aligned(0x40)));   
39
40// command tables array : one command table per entry in command list
41__attribute__((section(".kdata")))
42hba_cmd_table_t    hba_cmd_table[32] __attribute__((aligned(0x40))); 
43
44// extended pointer on the owner thread, for each slot
45__attribute__((section(".kdata")))
46xptr_t             hba_owner_thread[32];
47
48// bit vector of active slots
49__attribute__((section(".kdata")))
50uint32_t           hba_active_slots; 
51
52// spinlock protecting the command slot allocator
53__attribute__((section(".kdata")))
54spinlock_t         hba_lock;
55
56///////////////////////////////////////
57void soclib_hba_init( chdev_t * chdev )
58{
59    // get hardware device base address
60        xptr_t  hba_xp = chdev->base;
61
62    // get hardware device cluster and local pointer
63    cxy_t      hba_cxy  = GET_CXY( hba_xp );
64    uint32_t * hba_ptr  = (uint32_t *)GET_PTR( hba_xp );
65
66    // get block_size and block_count 
67        uint32_t block_size  = hal_remote_lw( XPTR( hba_cxy , hba_ptr + HBA_BLOCK_SIZE_REG ) );
68        uint32_t block_count = hal_remote_lw( XPTR( hba_cxy , hba_ptr + HBA_BLOCK_COUNT_REG ) );
69
70    // set device descriptor extension
71    chdev->ext.ioc.size  = block_size;
72    chdev->ext.ioc.count = block_count;
73
74    // activate HBA interrupts
75    hal_remote_sw( XPTR( hba_cxy , hba_ptr + HBA_PXIE_REG ) , 0x1 );
76
77        // reset SOCLIB_HBA driver global variable
78    hba_active_slots = 0;
79
80} // end soclib_hba_init()
81
82
83//////////////////////////////////////////////////////////////
84void __attribute__ ((noinline)) soclib_hba_cmd( xptr_t th_xp )
85{
86
87    uint32_t           cmd_type;     // IOC_READ / IOC_WRITE / IOC_SYNC_READ
88    uint32_t           lba;          // lba    : command argument
89    uint32_t           count;        // count  : command argument
90    xptr_t             buf_xp;       // buffer : command argument
91    xptr_t             dev_xp;       // device : command argument
92
93    uint32_t           cmd_id;       // current slot index in command bit_vector
94    hba_cmd_desc_t   * cmd_desc;     // command descriptor pointer   
95    hba_cmd_table_t  * cmd_table;    // command table pointer
96
97    bool_t             found;
98    uint32_t           iter; 
99
100    // get client thread cluster and local pointer
101    cxy_t      th_cxy = GET_CXY( th_xp );
102    thread_t * th_ptr = (thread_t *)GET_PTR( th_xp );
103
104    // get command arguments and extended pointer on IOC device
105    cmd_type  =         hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.ioc.type   ) );
106    lba       =         hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.ioc.lba    ) );
107    count     =         hal_remote_lw ( XPTR( th_cxy , &th_ptr->command.ioc.count  ) );
108    buf_xp    = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->command.ioc.buf_xp ) );
109    dev_xp    = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->command.ioc.dev_xp ) );
110
111    // get IOC device cluster and local pointer
112    cxy_t     dev_cxy = GET_CXY( dev_xp );
113    chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
114
115    // get extended pointer on SOCLIB-HBA peripheral
116    xptr_t     hba_xp = hal_remote_lw( XPTR( dev_cxy , &dev_ptr->base ) );
117
118    // get SOCLIB_HBA device cluster and local pointer
119    cxy_t      hba_cxy = GET_CXY( hba_xp );
120    uint32_t * hba_ptr = (uint32_t *)GET_PTR( hba_xp );
121
122    // try to register the I/O operation in a free slot
123    // returns if success, deschedule if no slot available
124    // we do not need a lock to access the slot allocator,
125    // because the driver is only called by the server thread.
126    while( 1 )
127    {
128        // try to find a free slot in the 32 slots command list
129        cmd_id = 0;
130        found  = false;
131        for ( iter = 0 ; iter < 32 ; iter++ )
132        {
133            if( (hba_active_slots & (1<<iter) ) == 0 )
134            {
135                found  = true;
136                cmd_id = iter;
137                hba_active_slots |= (1<<iter);
138                break;
139            }
140        }
141
142        if( found )  // slot available in SOCLIB_HBA
143        {
144            // compute pointers on command descriptor and command table   
145            cmd_desc  = &hba_cmd_list[cmd_id];
146            cmd_table = &hba_cmd_table[cmd_id];
147
148            // set  buffer descriptor in command table
149            cmd_table->buffer.dba  = (uint32_t)(buf_xp);   
150            cmd_table->buffer.dbau = (uint32_t)(buf_xp >> 32);
151            cmd_table->buffer.dbc  = count * 512;
152
153            // initialize command table header
154            cmd_table->header.lba0 = (char)lba;
155            cmd_table->header.lba1 = (char)(lba>>8);
156            cmd_table->header.lba2 = (char)(lba>>16);
157            cmd_table->header.lba3 = (char)(lba>>24);
158            cmd_table->header.lba4 = 0;
159            cmd_table->header.lba5 = 0;
160
161            // initialise command descriptor
162            cmd_desc->prdtl[0] = 1;
163            cmd_desc->prdtl[1] = 0;
164            if( cmd_type == IOC_WRITE ) cmd_desc->flag[0] = 0x40;
165            else                        cmd_desc->flag[0] = 0x00;     
166
167#if USE_IOB // software L2/L3 cache coherence
168
169            dev_mmc_sync( cmd_table , sizeof(hba_cmd_table_t) );
170            dev_mmc_sync( cmd_desc , sizeof(hba_cmd_desc_t) );
171
172#endif // end software L2/L3 cache coherence
173
174            // set hba_owner_thread[slot]
175            hba_owner_thread[cmd_id] = th_xp;
176
177            // register slot in bit_vector
178            hba_active_slots |= 1<<cmd_id;
179 
180            // set HBA_PXCI_REG to start transfer
181            hal_remote_sw( XPTR( hba_cxy , hba_ptr + HBA_PXCI_REG ) , 1<<cmd_id );
182
183            // exit the while
184            break;
185        }
186        else   // no slot available in SOCLIB_HBA
187        {
188            if( cmd_type == IOC_SYNC_READ )     // fatal if synchronous access
189            {
190                printk("\n[PANIC] in %s : no slot available for a SYNC_READ\n", __FUNCTION__ );
191                hal_core_sleep();
192            }
193            else                                // retry if asynchronous access.
194            {
195                sched_yield();
196            }
197        }
198    }  // end while to get a slot
199
200    // waiting policy depends on the command type
201
202    if( cmd_type == IOC_SYNC_READ )                // polling, busy waiting
203    {
204        uint32_t  pxis;
205        uint32_t  pxci;
206        uint32_t  error;
207        uint32_t  fault_id;
208        while(1)
209        {
210            pxis     = hal_remote_lw( XPTR( hba_cxy , hba_ptr + HBA_PXIS_REG ) );
211            pxci     = hal_remote_lw( XPTR( hba_cxy , hba_ptr + HBA_PXCI_REG ) );
212            error    = (pxis & 0x40000000) >> 30;
213            fault_id = (pxis & 0x1F000000) >> 24;
214
215            if( (pxci & (1<<cmd_id)) == 0 )  // completed
216            {
217                // release slot
218                hba_active_slots &= ~(1<<cmd_id);
219
220                // set operation status in client thread command
221                if( error && (fault_id == cmd_id) ) 
222                {
223                    hal_remote_sw( XPTR( th_cxy , &th_ptr->command.ioc.error ) , 1 );
224                }
225                else
226                {
227                    hal_remote_sw( XPTR( th_cxy , &th_ptr->command.ioc.error ) , 0 );
228                }
229
230                // exit while
231                break;
232            }   
233        }
234    }
235    else                                           // descheduling + IRQ
236    {
237        thread_block( CURRENT_THREAD , THREAD_BLOCKED_DEV_ISR );
238        sched_yield();
239    }
240           
241} // end soclib_hba_cmd()
242
243
244/////////////////////////////////////////////////////////////////
245void __attribute__ ((noinline)) soclib_hba_isr( chdev_t * chdev )
246{
247    // get extended pointer on client thread
248    xptr_t root      = XPTR( local_cxy , &chdev->wait_root );
249    xptr_t client_xp = XLIST_FIRST_ELEMENT( root , thread_t , wait_list );
250
251    // get client thread cluster and local pointer
252    cxy_t      client_cxy = GET_CXY( client_xp );
253    thread_t * client_ptr = (thread_t *)GET_PTR( client_xp );
254
255    // get SOCLIB_HBA device cluster and local pointer
256    cxy_t      hba_cxy  = GET_CXY( chdev->base );
257    uint32_t * hba_ptr  = (uint32_t *)GET_PTR( chdev->base );
258
259    // get HBA_PXIS_REG and HBA_PXCI_REG current values
260    uint32_t current_pxis = hal_remote_lw( XPTR( hba_cxy , hba_ptr + HBA_PXIS_REG ) );
261    uint32_t current_pxci = hal_remote_lw( XPTR( hba_cxy , hba_ptr + HBA_PXCI_REG ) );
262
263    uint32_t  error    = (current_pxis & 0x40000000) >> 30;
264    uint32_t  fault_id = (current_pxis & 0x1F000000) >> 24;
265    uint32_t  iter;
266
267    // loop on active commands to signal one or several completed I/O operations
268    for( iter = 0 ; iter < 32 ; iter++ )
269    {
270        if ( ( (hba_active_slots & (1<<iter)) != 0 ) &&  // active command
271             ( (current_pxci     & (1<<iter)) == 0 ) )   // completed command
272        {
273            // release the slot
274            hba_active_slots &= ~(1<<iter);
275
276            // set operation status in client thread command
277            if( error && (iter == fault_id ) ) 
278            {
279                hal_remote_sw( XPTR( client_cxy , &client_ptr->command.ioc.error ) , 1 );
280            }
281            else
282            {
283                hal_remote_sw( XPTR( client_cxy , &client_ptr->command.ioc.error ) , 0 );
284            }
285
286            // unblock client thread
287            thread_unblock( client_xp , THREAD_BLOCKED_IO );
288 
289            ioc_dmsg("INFO in %s : thread %x at cycle %d\n",
290            __FUNCTION__ , hal_remote_lw( XPTR( client_cxy , &client_ptr->trdid ) ) ,
291            hal_time_stamp() );
292        }
293    }
294
295    // reset HBA_PXIS_REG
296    hal_remote_sw( XPTR( hba_cxy , hba_ptr + HBA_PXIS_REG ) , 0 );
297
298} // end soclib_hba_isr()
299
300
301
Note: See TracBrowser for help on using the repository browser.