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138 lines
4.0 KiB
138 lines
4.0 KiB
4 weeks ago
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#!/bin/bash
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# Hack in additional firmware directories for supported caveats.
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#
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# SPDX-License-Identifier: CC0-1.0
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check() {
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return 0
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}
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install() {
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local FW_DIR=/lib/firmware
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local DATA_DIR=/usr/share/microcode_ctl/ucode_with_caveats
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local CFG_DIR="/etc/microcode_ctl/ucode_with_caveats"
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local check_caveats=/usr/libexec/microcode_ctl/check_caveats
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local fw_path_para=$(< /sys/module/firmware_class/parameters/path)
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local verbose_opt
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local cc_out
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local path
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local ignored
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local do_skip_host_only
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local p
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verbose_opt=
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[ 4 -gt "$stdloglvl" ] || verbose_opt="-v"
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# HACK: we override external fw_dir variable in order to get
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# an additional ucode based on the kernel version.
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dinfo " microcode_ctl module: mangling fw_dir"
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[ -z "$fw_dir_l" ] || {
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dinfo " microcode_ctl: avoid touching fw_dir as" \
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"it has been changed (fw_dir_l is '$fw_dir_l')"
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return 0
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}
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# Reset fw_dir to avoid inclusion of kernel-version-specific directories
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# populated with microcode for the late load, only in case it is set
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# to the default value to avoid meddling with user-enforced changes.
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# The second variant has been introduced in dracut-057~5.
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[ \( "x$fw_dir" != \
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"x/lib/firmware/updates /lib/firmware /lib/firmware/$kernel" \) -a \
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\( "x$fw_dir" != \
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"x${fw_path_para:+$fw_path_para }/lib/firmware/updates/$kernel /lib/firmware/updates /lib/firmware/$kernel /lib/firmware" \) ] || {
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fw_dir="/lib/firmware/updates /lib/firmware"
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dinfo " microcode_ctl: reset fw_dir to \"${fw_dir}\""
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}
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fw_dir_add=""
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while read -d $'\n' -r i; do
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dinfo " microcode_ctl: processing data directory " \
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"\"$DATA_DIR/$i\"..."
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if [ "x" != "x$hostonly" ]; then
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do_skip_host_only=0
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local sho_overrides="
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$CFG_DIR/skip-host-only-check
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$CFG_DIR/skip-host-only-check-$i
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$FW_DIR/$kernel/skip-host-only-check
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$FW_DIR/$kernel/skip-host-only-check-$i"
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for p in $(echo "$sho_overrides"); do
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[ -e "$p" ] || continue
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do_skip_host_only=1
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dinfo " microcode_ctl: $i; skipping" \
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"Host-Only check, since \"$p\" exists."
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break
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done
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else
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do_skip_host_only=1
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fi
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match_model_opt=""
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[ 1 = "$do_skip_host_only" ] || match_model_opt="-m"
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if ! cc_out=$($check_caveats -e -k "$kernel" -c "$i" \
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$verbose_opt $match_model_opt)
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then
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dinfo " microcode_ctl: kernel version \"$kernel\"" \
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"failed early load check for \"$i\", skipping"
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continue
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fi
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path=$(printf "%s" "$cc_out" | sed -n 's/^paths //p')
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[ -n "$path" ] || {
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ignored=$(printf "%s" "$cc_out" | \
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sed -n 's/^skip_cfgs //p')
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if [ -n "$ignored" ]; then
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dinfo " microcode_ctl: configuration" \
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"\"$i\" is ignored"
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else
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dinfo " microcode_ctl: no microcode paths" \
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"are associated with \"$i\", skipping"
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fi
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continue
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}
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dinfo " microcode_ctl: $i: caveats check for kernel" \
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"version \"$kernel\" passed, adding" \
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"\"$DATA_DIR/$i\" to fw_dir variable"
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if [ 0 -eq "$do_skip_host_only" ]; then
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fw_dir_add="$DATA_DIR/$i "
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else
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fw_dir_add="$DATA_DIR/$i $fw_dir_add"
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fi
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# The list of directories is reverse-sorted in order to preserve the
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# "last wins" policy in case of presence of multiple microcode
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# revisions.
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#
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# In case of hostonly == 0, all microcode revisions will be included,
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# but since the microcode search is done with the "first wins" policy
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# by the (early) microcode loading code, the correct microcode revision
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# still has to be picked.
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#
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# Note that dracut without patch [1] puts only the last directory
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# in the early cpio; we try to address this by putting only the last
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# matching caveat in the search path, but that workaround works only
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# for host-only mode; non-host-only mode early cpio generation is still
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# broken without that patch.
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#
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# [1] https://github.com/dracutdevs/dracut/commit/c44d2252bb4b
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done <<-EOF
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$(find "$DATA_DIR" -maxdepth 1 -mindepth 1 -type d -printf "%f\n" \
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| LC_ALL=C sort)
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EOF
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fw_dir="${fw_dir_add}${fw_dir}"
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dinfo " microcode_ctl: final fw_dir: \"${fw_dir}\""
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}
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