rtems: Add rtems_scheduler_ident_by_processor_set

Update #3070.

cpukit/rtems/Makefile.am

@@ -109,6 +109,7 @@ librtems_a_SOURCES += src/scheduleraddprocessor.c
 librtems_a_SOURCES += src/schedulergetprocessorset.c
 librtems_a_SOURCES += src/schedulerident.c
 librtems_a_SOURCES += src/scheduleridentbyprocessor.c
+librtems_a_SOURCES += src/scheduleridentbyprocessorset.c
 librtems_a_SOURCES += src/schedulerremoveprocessor.c
 
 ## RATEMON_C_FILES

cpukit/rtems/include/rtems/rtems/tasks.h

@@ -576,6 +576,31 @@ rtems_status_code rtems_scheduler_ident_by_processor(
   rtems_id *id
 );
 
+/**
+ * @brief Identifies a scheduler by a processor set.
+ *
+ * The scheduler is selected according to the highest numbered online processor
+ * in the specified processor set.
+ *
+ * @param[in] cpusetsize Size of the specified processor set buffer in
+ *   bytes.  This value must be positive.
+ * @param[out] cpuset The processor set to identify the scheduler.
+ * @param[out] id The scheduler identifier associated with the processor set.
+ *
+ * @retval RTEMS_SUCCESSFUL Successful operation.
+ * @retval RTEMS_INVALID_ADDRESS The @a id parameter is @c NULL.
+ * @retval RTEMS_INVALID_SIZE Invalid processor set size.
+ * @retval RTEMS_INVALID_NAME The processor set contains no online processor.
+ * @retval RTEMS_INCORRECT_STATE The processor set is valid, however, the
+ *   highest numbered online processor in the specified processor set is not
+ *   owned by a scheduler.
+ */
+rtems_status_code rtems_scheduler_ident_by_processor_set(
+  size_t           cpusetsize,
+  const cpu_set_t *cpuset,
+  rtems_id        *id
+);
+
 /**
  * @brief Gets the set of processors owned by the specified scheduler instance.
  *

cpukit/rtems/src/scheduleridentbyprocessorset.c

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2017 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * 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.
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/rtems/tasks.h>
+#include <rtems/score/assert.h>
+#include <rtems/score/schedulerimpl.h>
+
+rtems_status_code rtems_scheduler_ident_by_processor_set(
+  size_t           cpusetsize,
+  const cpu_set_t *cpuset,
+  rtems_id        *id
+)
+{
+  Processor_mask              set;
+  Processor_mask_Copy_status  status;
+  uint32_t                    cpu_index;
+  const Scheduler_Control    *scheduler;
+
+  if ( id == NULL ) {
+    return RTEMS_INVALID_ADDRESS;
+  }
+
+  status = _Processor_mask_From_cpu_set_t( &set, cpusetsize, cpuset );
+  if ( status == PROCESSOR_MASK_COPY_INVALID_SIZE ) {
+    return RTEMS_INVALID_SIZE;
+  }
+
+  _Processor_mask_And( &set, &set, _SMP_Get_online_processors() );
+  cpu_index = _Processor_mask_Find_last_set( &set );
+  if ( cpu_index == 0 ) {
+    return RTEMS_INVALID_NAME;
+  }
+
+  scheduler = _Scheduler_Get_by_CPU( _Per_CPU_Get_by_index( cpu_index - 1) );
+#if defined(RTEMS_SMP)
+  if ( scheduler == NULL ) {
+    return RTEMS_INCORRECT_STATE;
+  }
+#else
+  _Assert( scheduler != NULL );
+#endif
+
+  *id = _Scheduler_Build_id( _Scheduler_Get_index( scheduler ) );
+  return RTEMS_SUCCESSFUL;
+}

testsuites/smptests/smpscheduler02/init.c

@@ -134,8 +134,10 @@ static void test_scheduler_add_remove_processors(void)
   rtems_test_assert(sc == RTEMS_RESOURCE_IN_USE);
 
   if (rtems_get_processor_count() > 1) {
+    rtems_id scheduler_id;
     rtems_id scheduler_b_id;
     rtems_id task_id;
+    cpu_set_t first_cpu;
 
     sc = rtems_scheduler_ident(SCHED_B, &scheduler_b_id);
     rtems_test_assert(sc == RTEMS_SUCCESSFUL);
@@ -153,6 +155,15 @@ static void test_scheduler_add_remove_processors(void)
 
     rtems_test_assert(rtems_get_current_processor() == 1);
 
+    CPU_ZERO(&first_cpu);
+    CPU_SET(0, &first_cpu);
+    sc = rtems_scheduler_ident_by_processor_set(
+      sizeof(first_cpu),
+      &first_cpu,
+      &scheduler_id
+    );
+    rtems_test_assert(sc == RTEMS_INCORRECT_STATE);
+
     sc = rtems_scheduler_add_processor(scheduler_a_id, 0);
     rtems_test_assert(sc == RTEMS_SUCCESSFUL);
 

testsuites/sptests/spscheduler01/init.c

@@ -343,6 +343,7 @@ static void test_scheduler_ident(void)
   rtems_id scheduler_id;
   rtems_name name = BLUE;
   rtems_name invalid_name = RED;
+  cpu_set_t s;
 
   sc = rtems_scheduler_ident(name, NULL);
   rtems_test_assert(sc == RTEMS_INVALID_ADDRESS);
@@ -367,6 +368,24 @@ static void test_scheduler_ident(void)
   rtems_test_assert(sc == RTEMS_SUCCESSFUL);
 
   rtems_test_assert(scheduler_id == expected_id);
+
+  CPU_ZERO(&s);
+  CPU_SET(1, &s);
+  sc = rtems_scheduler_ident_by_processor_set(sizeof(s), &s, NULL);
+  rtems_test_assert(sc == RTEMS_INVALID_ADDRESS);
+
+  sc = rtems_scheduler_ident_by_processor_set(1, &s, &scheduler_id);
+  rtems_test_assert(sc == RTEMS_INVALID_SIZE);
+
+  sc = rtems_scheduler_ident_by_processor_set(sizeof(s), &s, &scheduler_id);
+  rtems_test_assert(sc == RTEMS_INVALID_NAME);
+
+  CPU_SET(0, &s);
+  scheduler_id = 0;
+  sc = rtems_scheduler_ident_by_processor_set(sizeof(s), &s, &scheduler_id);
+  rtems_test_assert(sc == RTEMS_SUCCESSFUL);
+
+  rtems_test_assert(scheduler_id == expected_id);
 }
 
 static void test_scheduler_get_processors(void)