Add binderized memtrack HAL service

Test: Boots and passes memtrack VTS with no memtrack-related SELinux
denials; dumpsys meminfo reports reasonable values for graphics memory
usage.
Bug: 36097468
Change-Id: I878bf682a74d479011e0435a427551ec606d032f
Signed-off-by: Connor O'Brien <connoro@google.com>

device.mk

@@ -233,6 +233,12 @@ PRODUCT_PACKAGES +=                         \
 PRODUCT_PACKAGES += \
     android.hardware.keymaster@3.0-impl
 
+# Memtrack HAL
+PRODUCT_PACKAGES += \
+    memtrack.msm8998 \
+    android.hardware.memtrack@1.0-impl \
+    android.hardware.memtrack@1.0-service
+
 # Bluetooth HAL
 PRODUCT_PACKAGES += \
   android.hardware.bluetooth@1.0-impl    \

manifest.xml

@@ -49,4 +49,10 @@
         <impl level="generic"></impl>
         <version>1.0</version>
     </hal>
+    <hal format="hidl">
+        <name>android.hardware.memtrack</name>
+        <transport>hwbinder</transport>
+        <impl level="generic"></impl>
+        <version>1.0</version>
+    </hal>
 </manifest>

sepolicy/domain.te

@@ -1,3 +1,9 @@
 userdebug_or_eng(`
   allow domain diag_device:chr_file rw_file_perms;
 ')
+
+# In order for /sys/kernel/debug/kgsl/proc/<pid>/mem
+# to be created for memory tracking, the domain of
+# the tracked process must have permission to search
+# in /sys/kernel/debug/kgsl
+allow domain debugfs_kgsl:dir search;

sepolicy/file.te

@@ -8,6 +8,7 @@ type sysfs_net, sysfs_type, fs_type;
 type sysfs_rmtfs, sysfs_type, fs_type;
 type sysfs_soc, sysfs_type, fs_type;
 type debugfs_rmt_storage, debugfs_type, fs_type;
+type debugfs_kgsl, debugfs_type, fs_type;
 
 # /proc
 type proc_wifi_dbg, fs_type;

sepolicy/genfs_contexts

@@ -1,2 +1,4 @@
 genfscon proc /debug/fwdump                           u:object_r:proc_wifi_dbg:s0
 genfscon proc /debugdriver/driverdump                 u:object_r:proc_wifi_dbg:s0
+
+genfscon debugfs /kgsl/proc                           u:object_r:debugfs_kgsl:s0

sepolicy/hal_memtrack.te

@@ -0,0 +1 @@
+allow hal_memtrack debugfs_kgsl:file { open read getattr };