memtrack: Add dummy stub libmemtrack module

This doesn't do anything right now, but avoids the constant
memtrack error messages.

Copied as is from John Stultz' stub implementation for Hikey.

Change-Id: If3cc79b54afdd35057e102ee1460e879c112d463
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>

5 files changed, 92 insertions, 0 deletions

diff --git a/device-common.mk b/device-common.mk
index 3f9eb9e..0354d41 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -106,6 +106,11 @@ PRODUCT_PACKAGES += android.hardware.power@1.0-impl
 #GNSS HAL
 PRODUCT_PACKAGES += android.hardware.gnss@1.0-impl
 
+# Memtrack
+PRODUCT_PACKAGES += memtrack.default \
+    android.hardware.memtrack@1.0-service \
+    android.hardware.memtrack@1.0-impl
+
 # Keymaster HAL
 PRODUCT_PACKAGES += \
     android.hardware.keymaster@3.0-impl \
diff --git a/libmemtrack/Android.mk b/libmemtrack/Android.mk
new file mode 100644
index 0000000..913cb22
--- /dev/null
+++ b/libmemtrack/Android.mk
@@ -0,0 +1,29 @@
+# Copyright (C) 2017 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LOCAL_PATH := $(call my-dir)
+
+# HAL module implemenation stored in
+# hw/<POWERS_HARDWARE_MODULE_ID>.<ro.hardware>.so
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_RELATIVE_PATH := hw
+LOCAL_PROPRIETARY_MODULE := true
+LOCAL_C_INCLUDES += hardware/libhardware/include
+LOCAL_CFLAGS := -Wconversion -Wall -Werror -Wno-sign-conversion
+LOCAL_CLANG  := true
+LOCAL_SHARED_LIBRARIES := liblog libhardware
+LOCAL_SRC_FILES := memtrack_dragonboard.c
+LOCAL_MODULE := memtrack.default
+include $(BUILD_SHARED_LIBRARY)
diff --git a/libmemtrack/memtrack_dragonboard.c b/libmemtrack/memtrack_dragonboard.c
new file mode 100644
index 0000000..cc4a2a1
--- /dev/null
+++ b/libmemtrack/memtrack_dragonboard.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <errno.h>
+
+#include <hardware/memtrack.h>
+
+int hikey_memtrack_init(const struct memtrack_module *module)
+{
+    if (!module)
+        return -1;
+
+    return 0;
+}
+
+static struct hw_module_methods_t memtrack_module_methods = {
+    .open = NULL,
+};
+
+struct memtrack_module HAL_MODULE_INFO_SYM = {
+    .common = {
+        .tag = HARDWARE_MODULE_TAG,
+        .module_api_version = MEMTRACK_MODULE_API_VERSION_0_1,
+        .hal_api_version = HARDWARE_HAL_API_VERSION,
+        .id = MEMTRACK_HARDWARE_MODULE_ID,
+        .name = "Dummy Memory Tracker HAL for Dragonboards",
+        .author = "The Android Open Source Project",
+        .methods = &memtrack_module_methods,
+    },
+
+    .init = hikey_memtrack_init,
+};
diff --git a/manifest.xml b/manifest.xml
index e6d754d..d76ceb0 100644
--- a/manifest.xml
+++ b/manifest.xml
@@ -94,6 +94,15 @@
         </interface>
     </hal>
     <hal format="hidl">
+        <name>android.hardware.memtrack</name>
+        <transport>hwbinder</transport>
+        <version>1.0</version>
+        <interface>
+            <name>IMemtrack</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+    <hal format="hidl">
         <name>android.hardware.wifi</name>
         <transport>hwbinder</transport>
         <impl level="generic"></impl>
diff --git a/sepolicy/hal_memtrack.te b/sepolicy/hal_memtrack.te
new file mode 100644
index 0000000..51bd527
--- /dev/null
+++ b/sepolicy/hal_memtrack.te
@@ -0,0 +1,4 @@
+# Memtrack reads proc/<pid>/cmdline to check if process is surfaceflinger.
+# Grant access if that's the case; don't log denials for other processes.
+allow hal_memtrack surfaceflinger:file read;
+dontaudit hal_memtrack { domain -surfaceflinger}:file read;