Introduce interrupts module for debug and trace

Interrupts module has following functions to perform:

1. Apply boot time configuration
	- Create a new trace instance
	- Enable required irq and irq_gia events in the
          instance
	- Apply required filters on the high frequency
          events
	- Set instance's trace buffer size
	- Enable tracing
2. Sepolicy for every required access
3. Copy interrupts trace buffer to dumpsys whenever triggered

AVC denials:
avc:  denied  { search } for  comm="dump_interrupts" name="radio" dev="dm-53" ino=373 scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:radio_vendor_data_file:s0 tclass=dir permissive=1
avc:  denied  { write } for  comm="dump_interrupts" name="all_logs" dev="dm-53" ino=7808 scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:radio_vendor_data_file:s0 tclass=dir permissive=1
avc:  denied  { add_name } for  comm="dump_interrupts" name="interrupts" scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:radio_vendor_data_file:s0 tclass=dir permissive=1
avc:  denied  { create } for  comm="dump_interrupts" name="interrupts" scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:radio_vendor_data_file:s0 tclass=dir permissive=1
avc:  denied  { search } for  comm="dump_interrupts" name="instances" dev="tracefs" ino=2151 scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:debugfs_tracing_instances:s0 tclass=dir permissive=1
avc:  denied  { search } for  comm="dump_interrupts" name="radio" dev="dm-53" ino=373 scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:radio_vendor_data_file:s0 tclass=dir permissive=1
avc:  denied  { read } for  comm="dump_interrupts" name="trace" dev="tracefs" ino=143409 scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:tracefs_instances_interrupts:s0 tclass=file permissive=1
avc:  denied  { open } for  comm="dump_interrupts" path="/sys/kernel/tracing/instances/irq_gia_google/trace" dev="tracefs" ino=143409 scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:tracefs_instances_interrupts:s0 tclass=file permissive=1
avc:  denied  { create } for  comm="dump_interrupts" name="interrupts_trace" scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:radio_vendor_data_file:s0 tclass=file permissive=1
avc:  denied  { write open } for  comm="dump_interrupts" path="/data/vendor/radio/logs/always-on/all_logs/interrupts/interrupts_trace" dev="dm-53" ino=8102 scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:radio_vendor_data_file:s0 tclass=file permissive=1
avc:  denied  { getattr } for  comm="dump_interrupts" path="/sys/kernel/tracing/instances/irq_gia_google/trace" dev="tracefs" ino=141578 scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:tracefs_instances_interrupts:s0 tclass=file permissive=1
avc:  denied  { getattr } for  comm="dump_interrupts" path="/data/vendor/radio/logs/always-on/all_logs/interrupts/interrupts_trace" dev="dm-53" ino=7965 scontext=u:r:dump_interrupts_traces:s0 tcontext=u:object_r:radio_vendor_data_file:s0 tclass=file permissive=1

Flag: EXEMPT, add interrupts traces dump program to bugreport
Bug: 376124648
Test: Manually checked boot time trace configuration. Collected
      `adb bugreport`. And checked interrupt traces are dumped
      into and extracted out from the bugreport. More details
      in the bug.
Change-Id: I08872a321fa9726b50a54aeb0a91ed63c0652a3a

interrupts/Android.bp

@@ -0,0 +1,21 @@
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+cc_binary {
+    name: "dump_interrupts_traces",
+    srcs: ["traces/dump_interrupts_traces.cpp"],
+    init_rc: ["init.interrupts.rc"],
+    cflags: [
+        "-Wall",
+        "-Wextra",
+        "-Werror",
+    ],
+    shared_libs: [
+        "libbase",
+        "libdump",
+        "liblog",
+    ],
+    vendor: true,
+    relative_install_path: "dump",
+}

interrupts/init.interrupts.rc

@@ -0,0 +1,23 @@
+on init
+    # Create the directory for the trace instance during early init
+    mkdir /sys/kernel/tracing/instances/irq_gia_google 0755 root root
+    chown system system /sys/kernel/tracing/instances/irq_gia_google
+    chown system system /sys/kernel/tracing/instances/irq_gia_google/trace
+
+    # Enable gia events
+    write /sys/kernel/tracing/instances/irq_gia_google/events/irq_gia/enable 1
+
+    # There are some very high frequency IRQ events happening all the time. Tracing
+    # them is not absolute necessity, but a flood of them is noise for more interesting
+    # events that we want to capture. All these high frequency IRQs have virq < 11.
+    write /sys/kernel/tracing/instances/irq_gia_google/events/irq/filter "irq > 11"
+    write /sys/kernel/tracing/instances/irq_gia_google/events/irq/irq_handler_entry/enable 1
+    write /sys/kernel/tracing/instances/irq_gia_google/events/irq/irq_handler_exit/enable 1
+
+    # Keep the buffer size small. This size is practically enough for debug purpose.
+    # Having low size helps because this entire buffer gets dumped in bugreport.
+    # Having a large size can impact bugreport size and time it takes to pack/unpack.
+    write /sys/kernel/tracing/instances/irq_gia_google/buffer_size_kb 512
+
+    # Go!
+    write /sys/kernel/tracing/instances/irq_gia_google/tracing_on 1

interrupts/interrupts.mk

@@ -0,0 +1,3 @@
+BOARD_VENDOR_SEPOLICY_DIRS += device/google/gs-common/interrupts/traces/sepolicy
+
+PRODUCT_PACKAGES += dump_interrupts_traces

interrupts/traces/dump_interrupts_traces.cpp

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2024 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 <android-base/file.h>
+
+int main() {
+    std::string outputDir = concatenatePath(BUGREPORT_PACKING_DIR, "interrupts");
+    if (mkdir(outputDir.c_str(), 0777) == -1) {
+        printf("Unable to create folder: %s\n", outputDir.c_str());
+        return 0;
+    }
+
+    copyFile("/sys/kernel/tracing/instances/irq_gia_google/trace",
+             concatenatePath(outputDir.c_str(), "interrupts_trace").c_str());
+
+    return 0;
+}

interrupts/traces/sepolicy/dump_interrupts_traces.te

@@ -0,0 +1,7 @@
+#
+pixel_bugreport(dump_interrupts_traces)
+
+allow dump_interrupts_traces radio_vendor_data_file:dir { search add_name create write };
+allow dump_interrupts_traces radio_vendor_data_file:file { getattr create write open };
+allow dump_interrupts_traces debugfs_tracing_instances:dir search;
+allow dump_interrupts_traces tracefs_instances_interrupts:file { getattr read open };

interrupts/traces/sepolicy/file.te

@@ -0,0 +1,2 @@
+#
+type tracefs_instances_interrupts, sysfs_type, fs_type;

interrupts/traces/sepolicy/file_contexts

@@ -0,0 +1 @@
+/vendor/bin/dump/dump_interrupts_traces          u:object_r:dump_interrupts_traces_exec:s0

interrupts/traces/sepolicy/genfs_contexts

@@ -0,0 +1 @@
+genfscon tracefs /instances/irq_gia_google/trace u:object_r:tracefs_instances_interrupts:s0