dumpstate: add logbuffer support for display

Add logbuffer support for display driver to dump DSI cmd

Bug: 291441544
Test: adb root; adb shell dumpsys
android.hardware.dumpstate.IDumpstateDevice/default dump_display_logbuffer
Change-Id: I0c40fa9836851caa5b02528888153bd82e3a9d75
Signed-off-by: Ken Lin <lyenting@google.com>

display_logbuffer/Android.bp

@@ -0,0 +1,19 @@
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+cc_binary {
+    name: "dump_display_logbuffer",
+    srcs: ["dump_display_logbuffer.cpp"],
+    init_rc: ["init.display_logbuffer.rc"],
+    cflags: [
+        "-Wall",
+        "-Wextra",
+        "-Werror",
+    ],
+    shared_libs: [
+        "libdump",
+    ],
+    vendor: true,
+    relative_install_path: "dump",
+}

display_logbuffer/dump.mk

@@ -0,0 +1,3 @@
+BOARD_VENDOR_SEPOLICY_DIRS += device/google/gs-common/display_logbuffer/sepolicy
+
+PRODUCT_PACKAGES += dump_display_logbuffer

display_logbuffer/dump_display_logbuffer.cpp

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2022 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 <dump/pixel_dump.h>
+#include <unistd.h>
+
+const char* logbuffer_paths[][2] = {
+    {"DSIM0", "/dev/logbuffer_dsim0"},
+    {"DSIM1", "/dev/logbuffer_dsim1"},
+};
+
+int main() {
+    for (auto &logbuffer_path : logbuffer_paths) {
+        if(!access(logbuffer_path[1], R_OK)) {
+            dumpFileContent(logbuffer_path[0], logbuffer_path[1]);
+        }
+    }
+
+    return 0;
+}

display_logbuffer/init.display_logbuffer.rc

@@ -0,0 +1,3 @@
+on property:ro.build.type=userdebug
+    chown system system /dev/logbuffer_dsim0
+    chown system system /dev/logbuffer_dsim1

display_logbuffer/sepolicy/device.te

@@ -0,0 +1 @@
+type display_log_device, dev_type;

display_logbuffer/sepolicy/dump_display_logbuffer.te

@@ -0,0 +1,3 @@
+pixel_bugreport(dump_display_logbuffer)
+
+allow dump_display_logbuffer display_log_device:chr_file r_file_perms;

display_logbuffer/sepolicy/file_contexts

@@ -0,0 +1,4 @@
+/vendor/bin/dump/dump_display_logbuffer      u:object_r:dump_display_logbuffer_exec:s0
+
+/dev/logbuffer_dsim0                         u:object_r:display_log_device:s0
+/dev/logbuffer_dsim1                         u:object_r:display_log_device:s0