commit 0fb39f6e698d99157b2ce640a4bacd4479c0cf11
author Tiffany Yang <ynaffit@google.com> Tue May 21 16:43:35 2024 -0700
committer Tiffany Yang <ynaffit@google.com> Wed Jul 10 18:59:44 2024 -0700
tree 36ceb80ed27c169da09333009e8ae04570880152
parent 60d8d17fbc946a6325939e59d43da9d8122c3c89

init: Support for initializing virtio-console devices

This change allows init to ensure that a specified virtio-console
device file (`/dev/hvc*`) is available before `ueventd` coldboot.
Times out if device path is not encountered within 10 seconds.

Bug: 325538592
Test: build bertha_x86_64 and bertha_arm64
Change-Id: Ia1512e69ea607bf4d235595caa53668e2dac500c

init/block_dev_initializer.cpp

diff --git a/init/block_dev_initializer.cpp b/init/block_dev_initializer.cpp
index a686d05..8f52158 100644
--- a/init/block_dev_initializer.cpp
+++ b/init/block_dev_initializer.cpp
@@ -139,6 +139,10 @@
     return InitDevice("/sys/devices/platform", dev_name);
 }
 
+bool BlockDevInitializer::InitHvcDevice(const std::string& dev_name) {
+    return InitDevice("/sys/devices/virtual/tty", dev_name);
+}
+
 bool BlockDevInitializer::InitDevice(const std::string& syspath, const std::string& device_name) {
     bool found = false;
 

init/block_dev_initializer.h

diff --git a/init/block_dev_initializer.h b/init/block_dev_initializer.h
index d5b1f60..cb1d365 100644
--- a/init/block_dev_initializer.h
+++ b/init/block_dev_initializer.h
@@ -34,6 +34,7 @@
     bool InitDevices(std::set<std::string> devices);
     bool InitDmDevice(const std::string& device);
     bool InitPlatformDevice(const std::string& device);
+    bool InitHvcDevice(const std::string& device);
 
   private:
     ListenerAction HandleUevent(const Uevent& uevent, std::set<std::string>* devices);