From 125bb747c3fd357b95e9833ae4255a370ba3211c Mon Sep 17 00:00:00 2001
From: Thomas Renninger <trenn@suse.de>
Date: Mon, 8 Sep 2014 12:34:48 +0200
Subject: [PATCH] dracut: Introduce --force-drivers parameter and
 force_drivers=+ config option

Which will not only add listed drivers, but also enforce that they are
tried to be loaded at early boot time.

This is needed if drivers which are not autoloaded (e.g. loop and a lot
others) shall get loaded via initramfs.

Cherry-picked from: cea907f6bf2fc97933b59e04f4520ca227251574
Resolves: #1577626
---
 dracut.8.asc      | 13 +++++++++++++
 dracut.conf.5.asc |  4 ++++
 dracut.sh         | 21 +++++++++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/dracut.8.asc b/dracut.8.asc
index e097e769..5af99fa3 100644
--- a/dracut.8.asc
+++ b/dracut.8.asc
@@ -136,6 +136,19 @@ example:
 ----
 ===============================
 
+**--force-drivers** _<list of kernel modules>_::
+    See add-drivers above. But in this case it is ensured that the drivers
+    are tried to be loaded early via modprobe.
++
+[NOTE]
+===============================
+If [LIST] has multiple arguments, then you have to put these in quotes. For
+example:
+----
+# dracut --force-drivers "kmodule1 kmodule2"  ...
+----
+===============================
+
 **--omit-drivers** _<list of kernel modules>_::
     specify a space-separated list of kernel modules not to add to the
     initramfs.
diff --git a/dracut.conf.5.asc b/dracut.conf.5.asc
index f4ad49d2..90120115 100644
--- a/dracut.conf.5.asc
+++ b/dracut.conf.5.asc
@@ -54,6 +54,10 @@ Space-separated lists have to have a leading and trailing space!
     Specify a space-separated list of kernel modules to add to the initramfs.
     The kernel modules have to be specified without the ".ko" suffix.
 
+*force_drivers+=*" __<list of kernel modules>__ "::
+    See add_drivers above. But in this case it is ensured that the drivers
+    are tried to be loaded early via modprobe.
+
 *omit_drivers+=*" __<kernel modules>__ "::
     Specify a space-separated list of kernel modules not to add to the
     initramfs. The kernel modules have to be specified without the ".ko" suffix.
diff --git a/dracut.sh b/dracut.sh
index 9dadece0..a34ca2a6 100755
--- a/dracut.sh
+++ b/dracut.sh
@@ -81,6 +81,10 @@ Creates initial ramdisk images for preloading modules
                          exclusively include in the initramfs.
   --add-drivers [LIST]  Specify a space-separated list of kernel
                          modules to add to the initramfs.
+  --force-drivers [LIST] Specify a space-separated list of kernel
+                         modules to add to the initramfs and make sure they
+                         are tried to be loaded via modprobe same as passing
+                         rd.driver.pre=DRIVER kernel parameter.
   --omit-drivers [LIST] Specify a space-separated list of kernel
                          modules not to add to the initramfs.
   --filesystems [LIST]  Specify a space-separated list of kernel filesystem
@@ -308,6 +312,7 @@ rearrange_params()
         --long add: \
         --long force-add: \
         --long add-drivers: \
+        --long force-drivers: \
         --long omit-drivers: \
         --long modules: \
         --long omit: \
@@ -476,6 +481,7 @@ while :; do
         -a|--add)      push add_dracutmodules_l  "$2"; PARMS_TO_STORE+=" '$2'"; shift;;
         --force-add)   push force_add_dracutmodules_l  "$2"; PARMS_TO_STORE+=" '$2'"; shift;;
         --add-drivers) push add_drivers_l        "$2"; PARMS_TO_STORE+=" '$2'"; shift;;
+        --force-drivers) push force_drivers_l    "$2"; PARMS_TO_STORE+=" '$2'"; shift;;
         --omit-drivers) push omit_drivers_l      "$2"; PARMS_TO_STORE+=" '$2'"; shift;;
         -m|--modules)  push dracutmodules_l      "$2"; PARMS_TO_STORE+=" '$2'"; shift;;
         -o|--omit)     push omit_dracutmodules_l "$2"; PARMS_TO_STORE+=" '$2'"; shift;;
@@ -928,6 +934,13 @@ if (( ${#add_drivers_l[@]} )); then
 fi
 add_drivers=${add_drivers/-/_}
 
+if (( ${#force_drivers_l[@]} )); then
+    while pop force_drivers_l val; do
+        force_drivers+=" $val "
+    done
+fi
+force_drivers=${force_drivers/-/_}
+
 if (( ${#omit_drivers_l[@]} )); then
     while pop omit_drivers_l val; do
         omit_drivers+=" $val "
@@ -944,6 +957,7 @@ fi
 omit_drivers_corrected=""
 for d in $omit_drivers; do
     [[ " $drivers $add_drivers " == *\ $d\ * ]] && continue
+    [[ " $drivers $force_drivers " == *\ $d\ * ]] && continue
     omit_drivers_corrected+="$d|"
 done
 omit_drivers="${omit_drivers_corrected%|}"
@@ -1389,6 +1403,13 @@ if [[ $no_kernel != yes ]]; then
     if [[ $add_drivers ]]; then
         hostonly='' instmods -c $add_drivers
     fi
+    if [[ $force_drivers ]]; then
+        hostonly='' instmods -c $force_drivers
+        rm -f $initdir/etc/cmdline.d/20-force_driver.conf
+        for mod in $force_drivers; do
+            echo "rd.driver.pre=$mod" >>$initdir/etc/cmdline.d/20-force_drivers.conf
+        done
+    fi
     if [[ $filesystems ]]; then
         hostonly='' instmods -c $filesystems
     fi