eudev: restore userspace firmware loading support

This sycncs eudev with systemd. This is required for old kernels to
work and does same backport as did in:

,----
| commit 31163abc7bedd477c1aad10e6d1f47dbee194513
| Author: Jonathan Liu <net147@gmail.com>
| Date:   Thu Mar 19 15:38:32 2015 +1100
|
|     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>
`----

Signed-off-by: Lauren Post <lauren.post@nxp.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

3 files changed, 394 insertions, 0 deletions

diff --git a/meta/recipes-core/udev/eudev/0014-Revert-rules-remove-firmware-loading-rules.patch b/meta/recipes-core/udev/eudev/0014-Revert-rules-remove-firmware-loading-rules.patch
new file mode 100644
index 0000000000..fe2ba5328d
--- /dev/null
+++ b/meta/recipes-core/udev/eudev/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/udev/eudev/Revert-udev-remove-userspace-firmware-loading-suppor.patch b/meta/recipes-core/udev/eudev/Revert-udev-remove-userspace-firmware-loading-suppor.patch
new file mode 100644
index 0000000000..db333e9376
--- /dev/null
+++ b/meta/recipes-core/udev/eudev/Revert-udev-remove-userspace-firmware-loading-suppor.patch
@@ -0,0 +1,364 @@
+From e415372cc7a2f52e70e1cfa8c6c1f633b411355d Mon Sep 17 00:00:00 2001
+From: Lauren Post <lauren.post@nxp.com>
+Date: Wed, 8 Jun 2016 06:51:56 -0500
+Subject: [PATCH] Revert "udev: remove userspace firmware loading support"
+
+This reverts commit 3b717594600fa717cdf9bcfd0c7c1b703b245482.
+
+Conflicts:
+	configure.ac
+	src/udev/udevd.c
+
+Upstream-Status: Inappropriate [OE specific]
+
+Signed-off-by: Lauren Post <lauren.post@nxp.com>
+---
+ configure.ac                     |  39 +++++++++-
+ rules/Makefile.am                |   5 ++
+ src/udev/Makefile.am             |  10 +++
+ src/udev/udev-builtin-firmware.c | 154 +++++++++++++++++++++++++++++++++++++++
+ src/udev/udev-builtin.c          |   3 +
+ src/udev/udev.h                  |   6 ++
+ src/udev/udevd.c                 |  13 ++++
+ 7 files changed, 227 insertions(+), 3 deletions(-)
+ create mode 100644 src/udev/udev-builtin-firmware.c
+
+diff --git a/configure.ac b/configure.ac
+index 8691891..65028c2 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -238,9 +238,42 @@ AC_CHECK_DECL([unshare],
+         [#include <sched.h>])
+ 
+ # ------------------------------------------------------------------------------
+-AC_PATH_TOOL(GPERF, gperf)
+-if test -z "$GPERF" ; then
+-        AC_MSG_ERROR([*** gperf not found])
++AC_ARG_WITH(firmware-path,
++       AS_HELP_STRING([--with-firmware-path=DIR[[[:DIR[...]]]]],
++          [Firmware search path (default=ROOTPREFIX/lib/firmware/updates:ROOTPREFIX/lib/firmware)]),
++       [], [with_firmware_path="$rootprefix/lib/firmware/updates:$rootprefix/lib/firmware"])
++OLD_IFS=$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])
++AS_IF([test "x$enable_gudev" = "xyes"], [ PKG_CHECK_MODULES([GLIB], [glib-2.0 >= 2.22.0 gobject-2.0 >= 2.22.0]) ])
++AM_CONDITIONAL([ENABLE_GUDEV], [test "x$enable_gudev" = "xyes"])
++
++# ------------------------------------------------------------------------------
++AC_ARG_ENABLE([keymap],
++        AS_HELP_STRING([--disable-keymap], [disable keymap fixup support @<:@default=enabled@:>@]),
++        [], [enable_keymap=yes])
++
++if test "x$enable_keymap" = "xyes"; then
++        AC_PATH_TOOL(GPERF, gperf)
++        if test -z "$GPERF" ; then
++                AC_MSG_ERROR([*** gperf not found])
++        fi
++        AC_DEFINE([ENABLE_KEYMAP], [1], [Define if we are enabling rule generator])
+ fi
+ 
+ # ------------------------------------------------------------------------------
+diff --git a/rules/Makefile.am b/rules/Makefile.am
+index 24c099c..d714ae3 100644
+--- a/rules/Makefile.am
++++ b/rules/Makefile.am
+@@ -22,6 +22,11 @@ dist_udevrules_DATA += \
+ 	80-net-name-slot.rules
+ endif
+ 
++if ENABLE_FIRMWARE
++dist_udevrules_DATA += \
++	50-firmware.rules
++endif
++
+ if HAVE_BLKID
+ dist_udevrules_DATA += \
+ 	60-persistent-storage.rules
+diff --git a/src/udev/Makefile.am b/src/udev/Makefile.am
+index 401af01..742fbc8 100644
+--- a/src/udev/Makefile.am
++++ b/src/udev/Makefile.am
+@@ -53,12 +53,18 @@ libudev_core_la_SOURCES = \
+ 	udev-ctrl.c \
+ 	udev-builtin.c \
+ 	udev-builtin-btrfs.c \
++	udev-builtin-firmware.c \
+ 	udev-builtin-hwdb.c \
+ 	udev-builtin-input_id.c \
+ 	udev-builtin-net_id.c \
+ 	udev-builtin-path_id.c \
+ 	udev-builtin-usb_id.c
+ 
++if ENABLE_FIRMWARE
++libudev_core_la_SOURCES += \
++	udev-builtin-firmware.c
++endif
++
+ include_HEADERS = \
+ 	udev.h
+ 
+@@ -86,6 +92,10 @@ libudev_core_la_LIBADD += \
+ 	$(KMOD_LIBS)
+ endif
+ 
++libudev_core_la_CPPFLAGS = \
++	$(AM_CPPFLAGS) \
++	-DFIRMWARE_PATH="$(FIRMWARE_PATH)"
++
+ #
+ # Extras
+ #
+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 74b3bdc..3657106 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 198cb2c..01a1e9c 100644
+--- a/src/udev/udev.h
++++ b/src/udev/udev.h
+@@ -149,6 +149,9 @@ 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,
+@@ -173,6 +176,9 @@ 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 b1de97a..35655d8 100644
+--- a/src/udev/udevd.c
++++ b/src/udev/udevd.c
+@@ -101,6 +101,9 @@ struct event {
+         bool is_block;
+         usec_t start_usec;
+         bool warned;
++#ifdef HAVE_FIRMWARE
++        bool nodelay;
++#endif
+ };
+ 
+ static inline struct event *node_to_event(struct udev_list_node *node) {
+@@ -491,6 +494,10 @@ 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));
+@@ -566,6 +573,12 @@ 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;
+-- 
+1.9.1
+
diff --git a/meta/recipes-core/udev/eudev_3.2.1.bb b/meta/recipes-core/udev/eudev_3.2.1.bb
index 9274849dfc..4a1a26aade 100644
--- a/meta/recipes-core/udev/eudev_3.2.1.bb
+++ b/meta/recipes-core/udev/eudev_3.2.1.bb
@@ -8,6 +8,8 @@ DEPENDS = "glib-2.0 glib-2.0-native gperf-native kmod libxslt-native util-linux"
 PROVIDES = "udev"
 
 SRC_URI = "https://github.com/gentoo/${BPN}/archive/v${PV}.tar.gz;downloadfilename=${BP}.tar.gz \
+           file://0014-Revert-rules-remove-firmware-loading-rules.patch \
+           file://Revert-udev-remove-userspace-firmware-loading-suppor.patch \
            file://devfs-udev.rules \
            file://init \
            file://links.conf \