kconfig: heap: Add Kconfig option to set heap size.

Allow the developer to set the maximum heap size so that power savings
can be made when full memory is not required for device use cases.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lrgirdwo

src/platform/ace30/include/platform/lib/memory.h

@@ -54,7 +54,7 @@
 /**
  * size of HPSRAM system heap
  */
-#define HEAPMEM_SIZE 0xD0000
+#define HEAPMEM_SIZE CONFIG_SOF_ZEPHYR_HEAP_SIZE
 
 #if CONFIG_COLD_STORE_EXECUTE_DRAM && \
 	(CONFIG_LLEXT_TYPE_ELF_RELOCATABLE || !defined(LL_EXTENSION_BUILD))

src/platform/lunarlake/include/platform/lib/memory.h

@@ -56,7 +56,7 @@
 /**
  * size of HPSRAM system heap
  */
-#define HEAPMEM_SIZE 0xF0000
+#define HEAPMEM_SIZE CONFIG_SOF_ZEPHYR_HEAP_SIZE
 
 #if CONFIG_COLD_STORE_EXECUTE_DRAM && \
 	(CONFIG_LLEXT_TYPE_ELF_RELOCATABLE || !defined(LL_EXTENSION_BUILD))

src/platform/meteorlake/include/platform/lib/memory.h

@@ -56,7 +56,7 @@
 /**
  * size of HPSRAM system heap
  */
-#define HEAPMEM_SIZE 0xF0000
+#define HEAPMEM_SIZE CONFIG_SOF_ZEPHYR_HEAP_SIZE
 
 #if CONFIG_COLD_STORE_EXECUTE_DRAM && \
 	(CONFIG_LLEXT_TYPE_ELF_RELOCATABLE || !defined(LL_EXTENSION_BUILD))

zephyr/Kconfig

@@ -19,6 +19,20 @@ config SOF_ZEPHYR_HEAP_CACHED
 	  Enable cached heap by mapping cached SOF memory zones to different
 	  Zephyr sys_heap objects and enable caching for non-shared zones.
 
+config SOF_ZEPHYR_HEAP_SIZE
+	hex "Size of the Zephyr heap for SOF"
+	default 0xF0000 if SOC_INTEL_ACE15_MTPM || SOC_INTEL_ACE20_LNL
+	default 0xD0000 if SOC_INTEL_ACE30
+	default 0x0
+	help
+	 Support scaling of the heap size for different platforms and different types
+	 of heaps. This is the default heap size for most users.
+	 TODO: Currently this setting is only available on platforms with a
+	 simplified heap size configuration. i.e. a single macro that defines the
+	 heap size. This is not the case for all platforms.
+	 NOTE: Keep in mind that the heap size should not be greater than the physical
+	 memory size of the system defined in DT (and this includes baseFW text/data).
+
 config ZEPHYR_NATIVE_DRIVERS
 	bool "Use Zephyr native drivers"
 	default n