From 26c142e5ad4a63ad42baa17159c1821afe473a00 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Fri, 17 Apr 2015 12:05:16 +0200
Subject: score: Refactor SMP cache manager support

---
 cpukit/score/src/smpmulticastaction.c | 141 ++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 cpukit/score/src/smpmulticastaction.c

(limited to 'cpukit/score/src/smpmulticastaction.c')

diff --git a/cpukit/score/src/smpmulticastaction.c b/cpukit/score/src/smpmulticastaction.c
new file mode 100644
index 0000000000..2e592627d7
--- /dev/null
+++ b/cpukit/score/src/smpmulticastaction.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) 2014 Aeroflex Gaisler AB.  All rights reserved.
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifdef HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <rtems/score/smpimpl.h>
+#include <rtems/score/smplock.h>
+#include <rtems/score/chainimpl.h>
+#include <rtems/score/sysstate.h>
+
+typedef struct {
+  Chain_Node Node;
+  SMP_Multicast_action_handler handler;
+  void *arg;
+  cpu_set_t *recipients;
+  size_t setsize;
+  Atomic_Ulong done;
+} SMP_Multicast_action;
+
+typedef struct {
+  SMP_lock_Control Lock;
+  Chain_Control List;
+} SMP_Multicast_action_context;
+
+static SMP_Multicast_action_context _SMP_Multicast_action_context = {
+  .Lock = SMP_LOCK_INITIALIZER("SMP Multicast Action"),
+  .List = CHAIN_INITIALIZER_EMPTY(_SMP_Multicast_action_context.List)
+};
+
+void
+_SMP_Multicast_actions_process(void)
+{
+  SMP_lock_Context lock_context;
+  SMP_Multicast_action *node;
+  SMP_Multicast_action *next;
+  uint32_t cpu_self_idx;
+
+  _SMP_lock_ISR_disable_and_acquire( &_SMP_Multicast_action_context.Lock,
+      &lock_context );
+  cpu_self_idx = _SMP_Get_current_processor();
+
+  node = (SMP_Multicast_action*)_Chain_First(
+      &_SMP_Multicast_action_context.List );
+  while ( !_Chain_Is_tail( &_SMP_Multicast_action_context.List, &node->Node ) ) {
+    next = (SMP_Multicast_action*)_Chain_Next( &node->Node );
+    if ( CPU_ISSET_S ( cpu_self_idx, node->setsize, node->recipients ) ) {
+      CPU_CLR_S ( cpu_self_idx, node->setsize, node->recipients );
+
+      node->handler( node->arg );
+
+      if ( CPU_COUNT_S( node->setsize, node->recipients ) == 0 ) {
+        _Chain_Extract_unprotected( &node->Node );
+        _Atomic_Store_ulong( &node->done, 1, ATOMIC_ORDER_RELEASE );
+      }
+    }
+    node = next;
+  }
+
+  _SMP_lock_Release_and_ISR_enable( &_SMP_Multicast_action_context.Lock,
+      &lock_context );
+}
+
+static void
+_SMP_Multicast_actions_try_process( void )
+{
+  unsigned long message;
+  Per_CPU_Control *cpu_self;
+  ISR_Level isr_level;
+
+  _ISR_Disable_without_giant( isr_level );
+
+  cpu_self = _Per_CPU_Get();
+
+  message = _Atomic_Load_ulong( &cpu_self->message, ATOMIC_ORDER_RELAXED );
+
+  if ( message & SMP_MESSAGE_MULTICAST_ACTION ) {
+    if ( _Atomic_Compare_exchange_ulong( &cpu_self->message, &message,
+        message & ~SMP_MESSAGE_MULTICAST_ACTION, ATOMIC_ORDER_RELAXED,
+        ATOMIC_ORDER_RELAXED ) ) {
+      _SMP_Multicast_actions_process();
+    }
+  }
+
+  _ISR_Enable_without_giant( isr_level );
+}
+
+void _SMP_Multicast_action(
+  const size_t setsize,
+  const cpu_set_t *cpus,
+  SMP_Multicast_action_handler handler,
+  void *arg
+)
+{
+  uint32_t i;
+  SMP_Multicast_action node;
+  size_t set_size = CPU_ALLOC_SIZE( _SMP_Get_processor_count() );
+  char cpu_set_copy[set_size];
+  SMP_lock_Context lock_context;
+
+  if ( ! _System_state_Is_up( _System_state_Get() ) ) {
+    handler( arg );
+    return;
+  }
+
+  memset( cpu_set_copy, 0, set_size );
+  if( cpus == NULL ) {
+    for( i=0; i<_SMP_Get_processor_count(); ++i )
+      CPU_SET_S( i, set_size, (cpu_set_t *)cpu_set_copy );
+  } else {
+    for( i=0; i<_SMP_Get_processor_count(); ++i )
+      if( CPU_ISSET_S( i, set_size, cpus ) )
+        CPU_SET_S( i, set_size, (cpu_set_t *)cpu_set_copy );
+  }
+
+  node.handler = handler;
+  node.arg = arg;
+  node.setsize = set_size;
+  node.recipients = (cpu_set_t *)cpu_set_copy;
+  _Atomic_Store_ulong( &node.done, 0, ATOMIC_ORDER_RELAXED );
+
+
+  _SMP_lock_ISR_disable_and_acquire( &_SMP_Multicast_action_context.Lock,
+      &lock_context );
+  _Chain_Prepend_unprotected( &_SMP_Multicast_action_context.List, &node.Node );
+  _SMP_lock_Release_and_ISR_enable( &_SMP_Multicast_action_context.Lock,
+      &lock_context );
+
+  _SMP_Send_message_multicast( set_size, node.recipients,
+      SMP_MESSAGE_MULTICAST_ACTION );
+
+  _SMP_Multicast_actions_try_process();
+
+  while ( !_Atomic_Load_ulong( &node.done, ATOMIC_ORDER_ACQUIRE ) );
+}
-- 
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