From 71767237dea8c68f83b73c29b8770902c95af3f3 Mon Sep 17 00:00:00 2001
From: Ken Lin <lyenting@google.com>
Date: Mon, 11 Dec 2023 07:37:14 +0000
Subject: [PATCH] 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                  | 19 +++++++++++
 display_logbuffer/dump.mk                     |  3 ++
 display_logbuffer/dump_display_logbuffer.cpp  | 32 +++++++++++++++++++
 display_logbuffer/init.display_logbuffer.rc   |  3 ++
 display_logbuffer/sepolicy/device.te          |  1 +
 .../sepolicy/dump_display_logbuffer.te        |  3 ++
 display_logbuffer/sepolicy/file_contexts      |  4 +++
 7 files changed, 65 insertions(+)
 create mode 100644 display_logbuffer/Android.bp
 create mode 100644 display_logbuffer/dump.mk
 create mode 100644 display_logbuffer/dump_display_logbuffer.cpp
 create mode 100644 display_logbuffer/init.display_logbuffer.rc
 create mode 100644 display_logbuffer/sepolicy/device.te
 create mode 100644 display_logbuffer/sepolicy/dump_display_logbuffer.te
 create mode 100644 display_logbuffer/sepolicy/file_contexts

diff --git a/display_logbuffer/Android.bp b/display_logbuffer/Android.bp
new file mode 100644
index 0000000..e2859d9
--- /dev/null
+++ b/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",
+}
diff --git a/display_logbuffer/dump.mk b/display_logbuffer/dump.mk
new file mode 100644
index 0000000..9808c1d
--- /dev/null
+++ b/display_logbuffer/dump.mk
@@ -0,0 +1,3 @@
+BOARD_VENDOR_SEPOLICY_DIRS += device/google/gs-common/display_logbuffer/sepolicy
+
+PRODUCT_PACKAGES += dump_display_logbuffer
diff --git a/display_logbuffer/dump_display_logbuffer.cpp b/display_logbuffer/dump_display_logbuffer.cpp
new file mode 100644
index 0000000..7477c8c
--- /dev/null
+++ b/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;
+}
\ No newline at end of file
diff --git a/display_logbuffer/init.display_logbuffer.rc b/display_logbuffer/init.display_logbuffer.rc
new file mode 100644
index 0000000..2a39ce3
--- /dev/null
+++ b/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
diff --git a/display_logbuffer/sepolicy/device.te b/display_logbuffer/sepolicy/device.te
new file mode 100644
index 0000000..94432f4
--- /dev/null
+++ b/display_logbuffer/sepolicy/device.te
@@ -0,0 +1 @@
+type display_log_device, dev_type;
\ No newline at end of file
diff --git a/display_logbuffer/sepolicy/dump_display_logbuffer.te b/display_logbuffer/sepolicy/dump_display_logbuffer.te
new file mode 100644
index 0000000..34da48c
--- /dev/null
+++ b/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;
\ No newline at end of file
diff --git a/display_logbuffer/sepolicy/file_contexts b/display_logbuffer/sepolicy/file_contexts
new file mode 100644
index 0000000..7425214
--- /dev/null
+++ b/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