systemd: restore userspace firmware loading support

This changes the minimum required Linux version from 3.7 back to 3.0.

[YOCTO #7409]

Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

3 files changed, 398 insertions, 0 deletions

diff --git a/meta/recipes-core/systemd/systemd/0014-Revert-rules-remove-firmware-loading-rules.patch b/meta/recipes-core/systemd/systemd/0014-Revert-rules-remove-firmware-loading-rules.patch
new file mode 100644
index 0000000000..fe2ba5328d
--- /dev/null
+++ b/meta/recipes-core/systemd/systemd/0014-Revert-rules-remove-firmware-loading-rules.patch
@@ -0,0 +1,28 @@
+From 4f0a722489154da99e7f6b3051afde984eed2f74 Mon Sep 17 00:00:00 2001
+From: Jonathan Liu <net147@gmail.com>
+Date: Thu, 19 Mar 2015 15:01:29 +1100
+Subject: [PATCH] Revert "rules: remove firmware loading rules"
+
+This reverts commit 70e7d754ddb356fb1a2942b262f8cee9650e2a19.
+Userspace firmware loading support is needed for Linux < 3.7.
+
+Upstream-Status: Inappropriate [OE specific]
+
+Signed-off-by: Jonathan Liu <net147@gmail.com>
+---
+ rules/50-firmware.rules | 3 +++
+ 1 file changed, 3 insertions(+)
+ create mode 100644 rules/50-firmware.rules
+
+diff --git a/rules/50-firmware.rules b/rules/50-firmware.rules
+new file mode 100644
+index 0000000..f0ae684
+--- /dev/null
++++ b/rules/50-firmware.rules
+@@ -0,0 +1,3 @@
++# do not edit this file, it will be overwritten on update
++
++SUBSYSTEM=="firmware", ACTION=="add", RUN{builtin}="firmware"
+-- 
+2.3.3
+
diff --git a/meta/recipes-core/systemd/systemd/0015-Revert-udev-remove-userspace-firmware-loading-suppor.patch b/meta/recipes-core/systemd/systemd/0015-Revert-udev-remove-userspace-firmware-loading-suppor.patch
new file mode 100644
index 0000000000..3e3aa278bd
--- /dev/null
+++ b/meta/recipes-core/systemd/systemd/0015-Revert-udev-remove-userspace-firmware-loading-suppor.patch
@@ -0,0 +1,367 @@
+From 7f074def4e32045353ba4336d703e17b8de7ec4e Mon Sep 17 00:00:00 2001
+From: Jonathan Liu <net147@gmail.com>
+Date: Thu, 19 Mar 2015 15:01:33 +1100
+Subject: [PATCH] Revert "udev: remove userspace firmware loading support"
+
+This reverts commit be2ea723b1d023b3d385d3b791ee4607cbfb20ca.
+Userspace firmware loading support is needed for Linux < 3.7.
+
+Upstream-Status: Inappropriate [OE specific]
+
+Signed-off-by: Jonathan Liu <net147@gmail.com>
+---
+ Makefile.am                      |  12 +++
+ README                           |   9 ++-
+ TODO                             |   1 +
+ configure.ac                     |  20 +++++
+ src/udev/udev-builtin-firmware.c | 154 +++++++++++++++++++++++++++++++++++++++
+ src/udev/udev-builtin.c          |   3 +
+ src/udev/udev.h                  |   6 ++
+ src/udev/udevd.c                 |  13 ++++
+ 8 files changed, 214 insertions(+), 4 deletions(-)
+ create mode 100644 src/udev/udev-builtin-firmware.c
+
+diff --git a/Makefile.am b/Makefile.am
+index bf04d31..9394700 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -3678,6 +3678,18 @@ libudev_core_la_LIBADD = \
+ 	$(BLKID_LIBS) \
+ 	$(KMOD_LIBS)
+ 
++libudev_core_la_CPPFLAGS = \
++	$(AM_CPPFLAGS) \
++	-DFIRMWARE_PATH="$(FIRMWARE_PATH)"
++
++if ENABLE_FIRMWARE
++libudev_core_la_SOURCES += \
++	src/udev/udev-builtin-firmware.c
++
++dist_udevrules_DATA += \
++	rules/50-firmware.rules
++endif
++
+ if HAVE_KMOD
+ libudev_core_la_SOURCES += \
+ 	src/udev/udev-builtin-kmod.c
+diff --git a/README b/README
+index c722092..db382d2 100644
+--- a/README
++++ b/README
+@@ -36,7 +36,8 @@ LICENSE:
+         - except src/udev/* which is (currently still) GPLv2, GPLv2+
+ 
+ REQUIREMENTS:
+-        Linux kernel >= 3.7
++        Linux kernel >= 3.0
++        Linux kernel >= 3.3 for loop device partition support features with nspawn
+         Linux kernel >= 3.8 for Smack support
+ 
+         Kernel Config Options:
+@@ -51,14 +52,14 @@ REQUIREMENTS:
+           CONFIG_PROC_FS
+           CONFIG_FHANDLE (libudev, mount and bind mount handling)
+ 
+-        udev will fail to work with the legacy sysfs layout:
++        Udev will fail to work with the legacy layout:
+           CONFIG_SYSFS_DEPRECATED=n
+ 
+         Legacy hotplug slows down the system and confuses udev:
+           CONFIG_UEVENT_HELPER_PATH=""
+ 
+-        Userspace firmware loading is not supported and should
+-        be disabled in the kernel:
++        Userspace firmware loading is deprecated, will go away, and
++        sometimes causes problems:
+           CONFIG_FW_LOADER_USER_HELPER=n
+ 
+         Some udev rules and virtualization detection relies on it:
+diff --git a/TODO b/TODO
+index 255a4f2..407bdd0 100644
+--- a/TODO
++++ b/TODO
+@@ -727,6 +727,7 @@ Features:
+ * ExecOnFailure=/usr/bin/foo
+ 
+ * udev:
++  - remove src/udev/udev-builtin-firmware.c (CONFIG_FW_LOADER_USER_HELPER=n)
+   - move to LGPL
+   - kill scsi_id
+   - add trigger --subsystem-match=usb/usb_device device
+diff --git a/configure.ac b/configure.ac
+index 97a29d6..13b80ce 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -1245,6 +1245,25 @@ fi
+ AM_CONDITIONAL(HAVE_MYHOSTNAME, [test "$have_myhostname" = "yes"])
+ 
+ # ------------------------------------------------------------------------------
++AC_ARG_WITH(firmware-path,
++       AS_HELP_STRING([--with-firmware-path=DIR[[[:DIR[...]]]]],
++          [Firmware search path (default="")]),
++       [], [with_firmware_path=""])
++OLD_IFS=$IFS
++IFS=:
++for i in $with_firmware_path; do
++       if test "x${FIRMWARE_PATH}" = "x"; then
++              FIRMWARE_PATH="\\\"${i}/\\\""
++       else
++              FIRMWARE_PATH="${FIRMWARE_PATH}, \\\"${i}/\\\""
++       fi
++done
++IFS=$OLD_IFS
++AC_SUBST(FIRMWARE_PATH)
++AS_IF([test "x${FIRMWARE_PATH}" != "x"], [ AC_DEFINE(HAVE_FIRMWARE, 1, [Define if FIRMWARE is available]) ])
++AM_CONDITIONAL(ENABLE_FIRMWARE, [test "x${FIRMWARE_PATH}" != "x"])
++
++# ------------------------------------------------------------------------------
+ AC_ARG_ENABLE([gudev],
+        AS_HELP_STRING([--disable-gudev], [disable Gobject libudev support @<:@default=enabled@:>@]),
+        [], [enable_gudev=yes])
+@@ -1533,6 +1552,7 @@ AC_MSG_RESULT([
+         Build Python:            ${PYTHON}
+         Installation Python:     ${PYTHON_BINARY}
+         sphinx binary:           ${SPHINX_BUILD}
++        firmware path:           ${FIRMWARE_PATH}
+         PAM modules dir:         ${with_pamlibdir}
+         PAM configuration dir:   ${with_pamconfdir}
+         D-Bus policy dir:        ${with_dbuspolicydir}
+diff --git a/src/udev/udev-builtin-firmware.c b/src/udev/udev-builtin-firmware.c
+new file mode 100644
+index 0000000..bd8c2fb
+--- /dev/null
++++ b/src/udev/udev-builtin-firmware.c
+@@ -0,0 +1,154 @@
++/*
++ * firmware - Kernel firmware loader
++ *
++ * Copyright (C) 2009 Piter Punk <piterpunk@slackware.com>
++ * Copyright (C) 2009-2011 Kay Sievers <kay@vrfy.org>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License as
++ * published by the Free Software Foundation; either version 2 of the
++ * License, or (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful, but
++ * WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++ * General Public License for more details:*
++ */
++
++#include <unistd.h>
++#include <stdlib.h>
++#include <string.h>
++#include <stdio.h>
++#include <getopt.h>
++#include <errno.h>
++#include <stdbool.h>
++#include <sys/utsname.h>
++#include <sys/stat.h>
++
++#include "udev.h"
++
++static bool set_loading(struct udev *udev, char *loadpath, const char *state) {
++        FILE *ldfile;
++
++        ldfile = fopen(loadpath, "we");
++        if (ldfile == NULL) {
++                log_error("error: can not open '%s'", loadpath);
++                return false;
++        };
++        fprintf(ldfile, "%s\n", state);
++        fclose(ldfile);
++        return true;
++}
++
++static bool copy_firmware(struct udev *udev, const char *source, const char *target, size_t size) {
++        char *buf;
++        FILE *fsource = NULL, *ftarget = NULL;
++        bool ret = false;
++
++        buf = malloc(size);
++        if (buf == NULL) {
++                log_error("No memory available to load firmware file");
++                return false;
++        }
++
++        log_debug("writing '%s' (%zi) to '%s'", source, size, target);
++
++        fsource = fopen(source, "re");
++        if (fsource == NULL)
++                goto exit;
++        ftarget = fopen(target, "we");
++        if (ftarget == NULL)
++                goto exit;
++        if (fread(buf, size, 1, fsource) != 1)
++                goto exit;
++        if (fwrite(buf, size, 1, ftarget) == 1)
++                ret = true;
++exit:
++        if (ftarget != NULL)
++                fclose(ftarget);
++        if (fsource != NULL)
++                fclose(fsource);
++        free(buf);
++        return ret;
++}
++
++static int builtin_firmware(struct udev_device *dev, int argc, char *argv[], bool test) {
++        struct udev *udev = udev_device_get_udev(dev);
++        static const char *searchpath[] = { FIRMWARE_PATH };
++        char loadpath[UTIL_PATH_SIZE];
++        char datapath[UTIL_PATH_SIZE];
++        char fwpath[UTIL_PATH_SIZE];
++        const char *firmware;
++        FILE *fwfile = NULL;
++        struct utsname kernel;
++        struct stat statbuf;
++        unsigned int i;
++        int rc = EXIT_SUCCESS;
++
++        firmware = udev_device_get_property_value(dev, "FIRMWARE");
++        if (firmware == NULL) {
++                log_error("firmware parameter missing");
++                rc = EXIT_FAILURE;
++                goto exit;
++        }
++
++        /* lookup firmware file */
++        uname(&kernel);
++        for (i = 0; i < ELEMENTSOF(searchpath); i++) {
++                strscpyl(fwpath, sizeof(fwpath), searchpath[i], kernel.release, "/", firmware, NULL);
++                fwfile = fopen(fwpath, "re");
++                if (fwfile != NULL)
++                        break;
++
++                strscpyl(fwpath, sizeof(fwpath), searchpath[i], firmware, NULL);
++                fwfile = fopen(fwpath, "re");
++                if (fwfile != NULL)
++                        break;
++        }
++
++        strscpyl(loadpath, sizeof(loadpath), udev_device_get_syspath(dev), "/loading", NULL);
++
++        if (fwfile == NULL) {
++                log_debug("did not find firmware file '%s'", firmware);
++                rc = EXIT_FAILURE;
++                /*
++                 * Do not cancel the request in the initrd, the real root might have
++                 * the firmware file and the 'coldplug' run in the real root will find
++                 * this pending request and fulfill or cancel it.
++                 * */
++                if (!in_initrd())
++                        set_loading(udev, loadpath, "-1");
++                goto exit;
++        }
++
++        if (stat(fwpath, &statbuf) < 0 || statbuf.st_size == 0) {
++                if (!in_initrd())
++                        set_loading(udev, loadpath, "-1");
++                rc = EXIT_FAILURE;
++                goto exit;
++        }
++
++        if (!set_loading(udev, loadpath, "1"))
++                goto exit;
++
++        strscpyl(datapath, sizeof(datapath), udev_device_get_syspath(dev), "/data", NULL);
++        if (!copy_firmware(udev, fwpath, datapath, statbuf.st_size)) {
++                log_error("error sending firmware '%s' to device", firmware);
++                set_loading(udev, loadpath, "-1");
++                rc = EXIT_FAILURE;
++                goto exit;
++        };
++
++        set_loading(udev, loadpath, "0");
++exit:
++        if (fwfile)
++                fclose(fwfile);
++        return rc;
++}
++
++const struct udev_builtin udev_builtin_firmware = {
++        .name = "firmware",
++        .cmd = builtin_firmware,
++        .help = "kernel firmware loader",
++        .run_once = true,
++};
+diff --git a/src/udev/udev-builtin.c b/src/udev/udev-builtin.c
+index 1950ec2..f21c0b6 100644
+--- a/src/udev/udev-builtin.c
++++ b/src/udev/udev-builtin.c
+@@ -34,6 +34,9 @@ static const struct udev_builtin *builtins[] = {
+         [UDEV_BUILTIN_BLKID] = &udev_builtin_blkid,
+ #endif
+         [UDEV_BUILTIN_BTRFS] = &udev_builtin_btrfs,
++#ifdef HAVE_FIRMWARE
++        [UDEV_BUILTIN_FIRMWARE] = &udev_builtin_firmware,
++#endif
+         [UDEV_BUILTIN_HWDB] = &udev_builtin_hwdb,
+         [UDEV_BUILTIN_INPUT_ID] = &udev_builtin_input_id,
+         [UDEV_BUILTIN_KEYBOARD] = &udev_builtin_keyboard,
+diff --git a/src/udev/udev.h b/src/udev/udev.h
+index dece6ec..f7ee1e7 100644
+--- a/src/udev/udev.h
++++ b/src/udev/udev.h
+@@ -151,6 +151,9 @@ enum udev_builtin_cmd {
+         UDEV_BUILTIN_BLKID,
+ #endif
+         UDEV_BUILTIN_BTRFS,
++#ifdef HAVE_FIRMWARE
++        UDEV_BUILTIN_FIRMWARE,
++#endif
+         UDEV_BUILTIN_HWDB,
+         UDEV_BUILTIN_INPUT_ID,
+         UDEV_BUILTIN_KEYBOARD,
+@@ -179,6 +182,9 @@ struct udev_builtin {
+ extern const struct udev_builtin udev_builtin_blkid;
+ #endif
+ extern const struct udev_builtin udev_builtin_btrfs;
++#ifdef HAVE_FIRMWARE
++extern const struct udev_builtin udev_builtin_firmware;
++#endif
+ extern const struct udev_builtin udev_builtin_hwdb;
+ extern const struct udev_builtin udev_builtin_input_id;
+ extern const struct udev_builtin udev_builtin_keyboard;
+diff --git a/src/udev/udevd.c b/src/udev/udevd.c
+index 99d4c89..71af1e1 100644
+--- a/src/udev/udevd.c
++++ b/src/udev/udevd.c
+@@ -99,6 +99,9 @@ struct event {
+         dev_t devnum;
+         int ifindex;
+         bool is_block;
++#ifdef HAVE_FIRMWARE
++        bool nodelay;
++#endif
+ };
+ 
+ static inline struct event *node_to_event(struct udev_list_node *node) {
+@@ -472,6 +475,10 @@ static int event_queue_insert(struct udev_device *dev) {
+         event->devnum = udev_device_get_devnum(dev);
+         event->is_block = streq("block", udev_device_get_subsystem(dev));
+         event->ifindex = udev_device_get_ifindex(dev);
++#ifdef HAVE_FIRMWARE
++        if (streq(udev_device_get_subsystem(dev), "firmware"))
++                event->nodelay = true;
++#endif
+ 
+         log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev),
+              udev_device_get_action(dev), udev_device_get_subsystem(dev));
+@@ -548,6 +555,12 @@ static bool is_devpath_busy(struct event *event) {
+                         return true;
+                 }
+ 
++#ifdef HAVE_FIRMWARE
++                /* allow to bypass the dependency tracking */
++                if (event->nodelay)
++                        continue;
++#endif
++
+                 /* parent device event found */
+                 if (event->devpath[common] == '/') {
+                         event->delaying_seqnum = loop_event->seqnum;
+-- 
+2.3.3
+
diff --git a/meta/recipes-core/systemd/systemd_219.bb b/meta/recipes-core/systemd/systemd_219.bb
index 31caa30345..5ecdda9e5b 100644
--- a/meta/recipes-core/systemd/systemd_219.bb
+++ b/meta/recipes-core/systemd/systemd_219.bb
@@ -44,6 +44,8 @@ SRC_URI = "git://anongit.freedesktop.org/systemd/systemd;branch=master \
            file://0002-tmpfiles-quietly-ignore-ACLs-on-unsupported-filesyst.patch \
            file://0012-systemd-tmpfiles.c-Honor-ordering-within-files-as-th.patch \
            file://0013-journal-fix-Inappropriate-ioctl-for-device-on-ext4.patch \
+           file://0014-Revert-rules-remove-firmware-loading-rules.patch \
+           file://0015-Revert-udev-remove-userspace-firmware-loading-suppor.patch \
            file://tmpfiles-pam.patch \
            file://touchscreen.rules \
            file://00-create-volatile.conf \
@@ -110,6 +112,7 @@ EXTRA_OECONF = " --with-rootprefix=${rootprefix} \
                  --enable-split-usr \
                  --without-python \
                  --with-sysvrcnd-path=${sysconfdir} \
+                 --with-firmware-path=${rootlibdir}/firmware \
                "
 # uclibc does not have NSS
 EXTRA_OECONF_append_libc-uclibc = " --disable-myhostname "