Changeset 478 for soft/giet_vm/giet_kernel/kernel_init.c

Timestamp:

Jan 1, 2015, 7:58:56 PM (9 years ago)

Author:

alain

Message:

1) The chained buffer structure has been modified to have one single buffer descriptor per cache line (64 bytes),
in order to simplify the software cache coherence between L2 and L3 caches when the IO bridge is used.
A new buffer_descriptor_t structure has been defined, and the fbf_chbuf_t and nic_chbuf_t structures have been adapted.
2) The NIC related system call handler _sys_nic_start() and _sys_nic_move() have been modified to support a distributed
kernel chbuf (one 4 Kbytes buffer per cluster), in order to support the one Gbit Ethernet NIC controller throughput.

• the _sys_nic_start() function initialises the distributed chbuf, using the distributed heap.
• the _sys_nic_move() function transfer one 4 KBytes container from the local kernel chbuf to an user local buffer.

This approach has been validated on the "classif" application: no packet loss with 16 clusters for average packet
length = 600 bytes and inter-packet gap = 300 cycles.

File:

• soft/giet_vm/giet_kernel/kernel_init.c (modified) (4 diffs)

soft/giet_vm/giet_kernel/kernel_init.c

@@ -16 +16 @@
 #include <xcu_driver.h>
 #include <ioc_driver.h>
+#include <mmc_driver.h>
 #include <ctx_handler.h>
 #include <irq_handler.h>
@@ -106 +107 @@
 ////////////////////////////////////////////////////////////////////////////////////
 
-sbt_lock_t     _tty_tx_lock[NB_TTY_CHANNELS]  __attribute__((aligned(64)));
-
 unsigned int   _tty_rx_buf[NB_TTY_CHANNELS];
 unsigned int   _tty_rx_full[NB_TTY_CHANNELS]; 
 
-
-
-
+////////////////////////////////////////////////////////////////////////////////////
+// Distributed locks protecting TTY terminals        
+////////////////////////////////////////////////////////////////////////////////////
+
+sbt_lock_t     _tty_tx_lock[NB_TTY_CHANNELS]  __attribute__((aligned(64)));
 
 ///////////////////////////////////////////////////////////////////////////////////
@@ -142 +143 @@
     while( cpid != kernel_init_barrier ) asm volatile ( "nop" );
 
-    // Step 0 : P[0,0,0] initialises the kernel FAT 
-    //          and the distributed kernel_heap descriptors array. 
+    // Step 0 : P[0,0,0] initialises various complex structures
+    //          - kernel FAT 
+    //          - distributed kernel heaps
+    //          - distributed locks protecting TTY channels 
+    //          - distributed locks protecting MMC components
     if ( gpid == 0 )
     {
@@ -155 +159 @@
         {
             _sbt_lock_init( &_tty_tx_lock[channel] );
+
+#if GIET_DEBUG_INIT
+_nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] completes TTY[%d] lock init\n", 
+               x , y , p , channel );
+#endif
         }
 
-#if GIET_DEBUG_INIT
-_nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] completes TTY locks init\n", x, y, p );
-#endif
-
+/*
+        unsigned int cx, cy;
+        for ( cx = 0 ; cx < X_SIZE ; cx++ )
+        {
+            for ( cy = 0 ; cy < X_SIZE ; cy++ )
+            {
+                _sbt_lock_init( &_mmc_lock[cx][cy] );
+
+#if GIET_DEBUG_INIT
+_nolock_printf("\n[DEBUG KERNEL_INIT] P[%d,%d,%d] completes MMC[%d][%d] lock init\n", 
+               x , y , p , cx , cy );
+#endif
+            }
+        }
+*/
         _fat_init( IOC_BOOT_MODE );