msm: 8974: Add driver to enable/disable memblock-remove feature
The msm_mem_hole driver is introduced to enable/disable
memblock-remove features for device tree nodes that set
compatible="qcom,msm-mem-hole"
Change-Id: I2aeb3725b74e9ff33992f70995767f790fc729c5
Signed-off-by: Neeti Desai <neetid@codeaurora.org>
diff --git a/arch/arm/mach-msm/Kconfig b/arch/arm/mach-msm/Kconfig
index 10c7089..dfe1033 100644
--- a/arch/arm/mach-msm/Kconfig
+++ b/arch/arm/mach-msm/Kconfig
@@ -264,6 +264,7 @@
select MSM_RPM_REGULATOR_SMD
select ARM_HAS_SG_CHAIN
select MSM_RUN_QUEUE_STATS
+ select MEMORY_HOLE_CARVEOUT
config ARCH_MPQ8092
bool "MPQ8092"
diff --git a/arch/arm/mach-msm/Makefile b/arch/arm/mach-msm/Makefile
index 6a62f8c..f46e576 100644
--- a/arch/arm/mach-msm/Makefile
+++ b/arch/arm/mach-msm/Makefile
@@ -401,3 +401,5 @@
endif
obj-$(CONFIG_MSM_FIQ) += msm7k_fiq.o
obj-$(CONFIG_MSM_FIQ) += msm7k_fiq_handler.o
+
+obj-$(CONFIG_MEMORY_HOLE_CARVEOUT) += msm_mem_hole.o
diff --git a/arch/arm/mach-msm/msm_mem_hole.c b/arch/arm/mach-msm/msm_mem_hole.c
new file mode 100644
index 0000000..736219b
--- /dev/null
+++ b/arch/arm/mach-msm/msm_mem_hole.c
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2012, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/**
+ * This module exists for the express purpose of removing memory
+ * via the msm memory-remove mechanism (see
+ * Documentation/devicetree/bindings/arm/msm/memory-reserve.txt). Compiling
+ * this module into a kernel is essentially the means by which any
+ * nodes in the device tree with compatible =
+ * "qcom,msm-mem-hole" will be "activated", thus providing a
+ * convenient mechanism for enabling/disabling memory removal
+ * (qcom,memory-*).
+ */
+
+#include <linux/module.h>
+
+#define MSM_MEM_HOLE_COMPAT_STR "qcom,msm-mem-hole"
+
+EXPORT_COMPAT(MSM_MEM_HOLE_COMPAT_STR);
diff --git a/mm/Kconfig b/mm/Kconfig
index 84489cd..4cde97f 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -379,3 +379,14 @@
in a negligible performance hit.
If unsure, say Y to enable cleancache
+
+config MEMORY_HOLE_CARVEOUT
+ bool
+ help
+ MEMORY_HOLE_CARVEOUT is needed to include the msm_mem_hole driver
+ which is needed to enable/disable memblock-remove features for
+ device tree nodes that set compatible="qcom,msm-mem-hole". The
+ corresponding device tree node provides the address and size of
+ the memory corresponding to the hole to be removed using memblock-
+ remove.
+