[PATCH 1/2] rtems: Add rtems_cache_coherent_allocate()
Sebastian Huber
sebastian.huber at embedded-brains.de
Tue Nov 25 16:28:41 UTC 2014
Add rtems_cache_coherent_free() and rtems_cache_coherent_add_area().
---
cpukit/libcsupport/Makefile.am | 1 +
cpukit/libcsupport/src/cachecoherentalloc.c | 122 ++++++++++++++++++++++++++++
cpukit/rtems/include/rtems/rtems/cache.h | 61 ++++++++++++++
testsuites/sptests/spcache01/init.c | 47 +++++++++++
testsuites/sptests/spcache01/spcache01.doc | 3 +
testsuites/sptests/spcache01/spcache01.scn | 1 +
6 files changed, 235 insertions(+)
create mode 100644 cpukit/libcsupport/src/cachecoherentalloc.c
diff --git a/cpukit/libcsupport/Makefile.am b/cpukit/libcsupport/Makefile.am
index 95c85c4..dfa8736 100644
--- a/cpukit/libcsupport/Makefile.am
+++ b/cpukit/libcsupport/Makefile.am
@@ -109,6 +109,7 @@ MALLOC_C_FILES = src/malloc_initialize.c src/calloc.c src/malloc.c \
src/rtems_heap_extend.c \
src/rtems_heap_greedy.c
MALLOC_C_FILES += src/cachealignedalloc.c
+MALLOC_C_FILES += src/cachecoherentalloc.c
PASSWORD_GROUP_C_FILES = src/pwdgrp.c
PASSWORD_GROUP_C_FILES += src/getgrent.c
diff --git a/cpukit/libcsupport/src/cachecoherentalloc.c b/cpukit/libcsupport/src/cachecoherentalloc.c
new file mode 100644
index 0000000..bf8167d
--- /dev/null
+++ b/cpukit/libcsupport/src/cachecoherentalloc.c
@@ -0,0 +1,122 @@
+/**
+ * @file
+ *
+ * @ingroup ClassicCache
+ */
+
+/*
+ * Copyright (c) 2014 embedded brains GmbH. All rights reserved.
+ *
+ * embedded brains GmbH
+ * Dornierstr. 4
+ * 82178 Puchheim
+ * Germany
+ * <rtems at 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.h>
+#include <rtems/malloc.h>
+#include <rtems/score/apimutex.h>
+#include <rtems/score/heapimpl.h>
+#include <rtems/score/sysstate.h>
+
+static Heap_Control cache_coherent_heap_instance;
+
+static Heap_Control *cache_coherent_heap;
+
+void *rtems_cache_coherent_allocate(
+ size_t size,
+ uintptr_t alignment,
+ uintptr_t boundary
+)
+{
+ void *ptr;
+ Heap_Control *heap;
+
+ _RTEMS_Lock_allocator();
+
+ heap = cache_coherent_heap;
+ if ( heap == NULL ) {
+ heap = RTEMS_Malloc_Heap;
+ }
+
+ ptr = _Heap_Allocate_aligned_with_boundary(
+ heap,
+ size,
+ alignment,
+ boundary
+ );
+
+ _RTEMS_Unlock_allocator();
+
+ return ptr;
+}
+
+void rtems_cache_coherent_free( void *ptr )
+{
+ Heap_Control *heap;
+
+ _RTEMS_Lock_allocator();
+
+ heap = cache_coherent_heap;
+ if ( heap != NULL ) {
+ if ( _Heap_Free( heap, ptr ) ) {
+ heap = NULL;
+ } else {
+ heap = RTEMS_Malloc_Heap;
+ }
+ } else {
+ heap = RTEMS_Malloc_Heap;
+ }
+
+ if ( heap != NULL ) {
+ _Heap_Free( heap, ptr );
+ }
+
+ _RTEMS_Unlock_allocator();
+}
+
+static void add_area(
+ void *area_begin,
+ uintptr_t area_size
+)
+{
+ Heap_Control *heap = cache_coherent_heap;
+
+ if ( heap == NULL ) {
+ bool ok;
+
+ heap = &cache_coherent_heap_instance;
+
+ ok = _Heap_Initialize( heap, area_begin, area_size, 0 );
+ if ( ok ) {
+ cache_coherent_heap = heap;
+ }
+ } else {
+ _Heap_Extend( heap, area_begin, area_size, 0 );
+ }
+}
+
+void rtems_cache_coherent_add_area(
+ void *area_begin,
+ uintptr_t area_size
+)
+{
+ if ( _System_state_Is_up( _System_state_Get()) ) {
+ _RTEMS_Lock_allocator();
+
+ add_area( area_begin, area_size );
+
+ _RTEMS_Unlock_allocator();
+ } else {
+ add_area( area_begin, area_size );
+ }
+}
diff --git a/cpukit/rtems/include/rtems/rtems/cache.h b/cpukit/rtems/include/rtems/rtems/cache.h
index ce399c6..a7dcaa6 100644
--- a/cpukit/rtems/include/rtems/rtems/cache.h
+++ b/cpukit/rtems/include/rtems/rtems/cache.h
@@ -191,6 +191,67 @@ void rtems_cache_disable_instruction( void );
*/
void *rtems_cache_aligned_malloc ( size_t nbytes );
+/**
+ * @brief Allocates a memory area of size @a size bytes from cache coherent
+ * memory.
+ *
+ * A size value of zero will return a unique address which may be freed with
+ * rtems_cache_coherent_free().
+ *
+ * The memory allocated by this function can be released with a call to
+ * rtems_cache_coherent_free().
+ *
+ * By default the C program heap allocator is used. In case special memory
+ * areas must be used, then the BSP or the application must add cache coherent
+ * memory areas for the allocator via rtems_cache_coherent_add_area().
+ *
+ * This function must be called from driver initialization or task context
+ * only.
+ *
+ * @param[in] alignment If the alignment parameter is not equal to zero, the
+ * allocated memory area will begin at an address aligned by this value.
+ * @param[in] boundary If the boundary parameter is not equal to zero, the
+ * allocated memory area will comply with a boundary constraint. The
+ * boundary value specifies the set of addresses which are aligned by the
+ * boundary value. The interior of the allocated memory area will not
+ * contain an element of this set. The begin or end address of the area may
+ * be a member of the set.
+ *
+ * @retval NULL If no memory is available or the parameters are inconsistent.
+ * @retval other A pointer to the begin of the allocated memory area.
+ */
+void *rtems_cache_coherent_allocate(
+ size_t size,
+ uintptr_t alignment,
+ uintptr_t boundary
+);
+
+/**
+ * @brief Frees memory allocated by rtems_cache_coherent_allocate().
+ *
+ * This function must be called from driver initialization or task context
+ * only.
+ *
+ * @param[in] ptr A pointer returned by rtems_cache_coherent_allocate().
+ */
+void rtems_cache_coherent_free( void *ptr );
+
+/**
+ * @brief Adds a cache coherent memory area to the cache coherent allocator.
+ *
+ * This function must be called from BSP initialization, driver initialization
+ * or task context only.
+ *
+ * @param[in] area_begin The area begin address.
+ * @param[in] area_size The area size in bytes.
+ *
+ * @see rtems_cache_coherent_allocate().
+ */
+void rtems_cache_coherent_add_area(
+ void *area_begin,
+ uintptr_t area_size
+);
+
#if defined( RTEMS_SMP )
/**
diff --git a/testsuites/sptests/spcache01/init.c b/testsuites/sptests/spcache01/init.c
index 95777e1..8ed3dbe 100644
--- a/testsuites/sptests/spcache01/init.c
+++ b/testsuites/sptests/spcache01/init.c
@@ -22,6 +22,7 @@
#include <rtems.h>
#include <rtems/counter.h>
+#include <rtems/score/sysstate.h>
#define TESTS_USE_PRINTF
#include "tmacros.h"
@@ -409,6 +410,51 @@ static void test_cache_aligned_alloc(void)
free(p1);
}
+#define AREA_SIZE 256
+
+static char cache_coherent_area_0[AREA_SIZE];
+
+static char cache_coherent_area_1[AREA_SIZE];
+
+static char cache_coherent_area_2[AREA_SIZE];
+
+static void add_area(void *begin)
+{
+ rtems_cache_coherent_add_area(NULL, 0);
+ rtems_cache_coherent_add_area(begin, AREA_SIZE);
+}
+
+static void test_cache_coherent_alloc(void)
+{
+ void *p0;
+ void *p1;
+ System_state_Codes previous_state;
+
+ printf("test cache coherent allocation\n");
+
+ p0 = rtems_cache_coherent_allocate(1, 0, 0);
+ rtems_test_assert(p0 != NULL);
+
+ rtems_cache_coherent_free(p0);
+
+ p0 = rtems_cache_coherent_allocate(1, 0, 0);
+ rtems_test_assert(p0 != NULL);
+
+ add_area(&cache_coherent_area_0[0]);
+ add_area(&cache_coherent_area_1[0]);
+
+ previous_state = _System_state_Get();
+ _System_state_Set(previous_state + 1);
+ add_area(&cache_coherent_area_2[0]);
+ _System_state_Set(previous_state);
+
+ p1 = rtems_cache_coherent_allocate(1, 0, 0);
+ rtems_test_assert(p1 != NULL);
+
+ rtems_cache_coherent_free(p0);
+ rtems_cache_coherent_free(p1);
+}
+
static void Init(rtems_task_argument arg)
{
TEST_BEGIN();
@@ -416,6 +462,7 @@ static void Init(rtems_task_argument arg)
test_data_flush_and_invalidate();
test_timing();
test_cache_aligned_alloc();
+ test_cache_coherent_alloc();
TEST_END();
diff --git a/testsuites/sptests/spcache01/spcache01.doc b/testsuites/sptests/spcache01/spcache01.doc
index 04e32a1..9c33d94 100644
--- a/testsuites/sptests/spcache01/spcache01.doc
+++ b/testsuites/sptests/spcache01/spcache01.doc
@@ -14,6 +14,9 @@ directives:
- rtems_cache_invalidate_multiple_data_lines()
- rtems_cache_invalidate_multiple_instruction_lines()
- rtems_cache_aligned_malloc()
+ - rtems_cache_coherent_allocate()
+ - rtems_cache_coherent_free()
+ - rtems_cache_coherent_add_area()
concepts:
diff --git a/testsuites/sptests/spcache01/spcache01.scn b/testsuites/sptests/spcache01/spcache01.scn
index 4e7d53a..6f1d2a6 100644
--- a/testsuites/sptests/spcache01/spcache01.scn
+++ b/testsuites/sptests/spcache01/spcache01.scn
@@ -43,4 +43,5 @@ invalidate multiple instruction
duration with warm cache 640 ns
duration with invalidated cache 2600 ns
test rtems_cache_aligned_malloc()
+test cache coherent allocation
*** END OF TEST SPCACHE 1 ***
--
1.8.4.5
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