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Commit d479afa0 authored by Kelvin Zhang's avatar Kelvin Zhang
Browse files

Load kernel modules from /lib/modules/`uname -r`_$(page_size) if present 

To support booting from both 4k/16k kernels, init need to tell which
kernel we are currently booting and load the right modules. To resolve
this issue, we store 16K modules into /lib/modules/`uname -r`_16k
directory.

Test: th
Bug: 293313353
Change-Id: I4a8296384537a71e16cd20e76e6c5dfb9074f574
parent 4b503b96

init/first_stage_init.cpp

+20 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 
#include <android-base/chrono_utils.h>

#include <android-base/file.h>

#include <android-base/logging.h>

#include <android-base/stringprintf.h>

#include <modprobe/modprobe.h>

#include <private/android_filesystem_config.h>
@@ -153,6 +154,15 @@ void PrepareSwitchRoot() { 
        Copy(snapuserd, dst);

    }

}



std::string GetPageSizeSuffix() {

    static const size_t page_size = sysconf(_SC_PAGE_SIZE);

    if (page_size <= 4096) {

        return "";

    }

    return android::base::StringPrintf("_%zuk", page_size / 1024);

}



}  // namespace



std::string GetModuleLoadList(BootMode boot_mode, const std::string& dir_path) {
@@ -201,10 +211,18 @@ bool LoadKernelModules(BootMode boot_mode, bool want_console, bool want_parallel 
    }

    dirent* entry = nullptr;

    std::vector<std::string> module_dirs;

    const std::string release_specific_module_dir = uts.release + GetPageSizeSuffix();

    while ((entry = readdir(base_dir.get()))) {

        if (entry->d_type != DT_DIR) {

            continue;

        }

        if (entry->d_name == release_specific_module_dir) {

            LOG(INFO) << "Release specific kernel module dir " << release_specific_module_dir

                      << " found, loading modules from here with no fallbacks.";

            module_dirs.clear();

            module_dirs.emplace_back(entry->d_name);

            break;

        }

        int dir_major = 0, dir_minor = 0;

        if (sscanf(entry->d_name, "%d.%d", &dir_major, &dir_minor) != 2 || dir_major != major ||

            dir_minor != minor) {
@@ -228,6 +246,7 @@ bool LoadKernelModules(BootMode boot_mode, bool want_console, bool want_parallel 
        bool retval = m.LoadListedModules(!want_console);

        modules_loaded = m.GetModuleCount();

        if (modules_loaded > 0) {

            LOG(INFO) << "Loaded " << modules_loaded << " modules from " << dir_path;

            return retval;

        }

    }
@@ -237,6 +256,7 @@ bool LoadKernelModules(BootMode boot_mode, bool want_console, bool want_parallel 
                                  : m.LoadListedModules(!want_console);

    modules_loaded = m.GetModuleCount();

    if (modules_loaded > 0) {

        LOG(INFO) << "Loaded " << modules_loaded << " modules from " << MODULE_BASE_DIR;

        return retval;

    }

    return true;