kernel-yocto: streamline patch, configuration and audit phases

We've been running with a set of kern-tools that were designed to work
with build systems that knew nothing about git, trees, commits, etc.

As such, there's been a set of shims/wrappers in place to work with
within bitbake/oe-core. These were the *me scripts: createme, updateme,
patchme and configme.

With this commit, we strip that legacy code and use the tools directly.
This means less complexity, fewer corner cases .. and no surprises
when the tools are arunning. As another benefit, the tools consume
much less time during a typical build and have no noticeable impact
on the overall build time.

Existing .scc files, features, and processing are not impacted as
these tools are compatible with existing feature descriptions and
kerne configuration fragments.

The audit of kernel configuration fragments is now detached
from the linux-yocto build structure and process. This means that
they can eventually be tweaked to offer kernel audit to any type of
kernel build and configuration process.

Additionally, the kernel symbol audit phase can now resolve symbol
dependencies and offer guidance when a symbol is missing:

   WARNING: linux-yocto-4.4.15+gitAUTOINC+b030d96c7b_f5e2c49d58-r0 do_kernel_configcheck: [kernel config]: specified values did not make it into the kernel's final configuration:

   ---------- CONFIG_BT_6LOWPAN -----------------
   Config: CONFIG_BT_6LOWPAN
   From: /home/bruce/poky/build/tmp/work-shared/qemux86-64/kernel-source/.kernel-meta/configs/standard/features/bluetooth/bluetooth.cfg
   Requested value:  CONFIG_BT_6LOWPAN=y
   Actual value:

   Config 'BT_6LOWPAN' has the following conditionals:
     BT_LE && 6LOWPAN (value: "n")
   Dependency values are:
     BT_LE [y] 6LOWPAN [n]

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

1 files changed, 53 insertions, 90 deletions

diff --git a/meta/classes/kernel-yocto.bbclass b/meta/classes/kernel-yocto.bbclass
index a9d42053da0..8650e55de72 100644
--- a/meta/classes/kernel-yocto.bbclass
+++ b/meta/classes/kernel-yocto.bbclass
@@ -119,77 +119,42 @@ do_kernel_metadata() {
 	patches="${@" ".join(find_patches(d))}"
 	feat_dirs="${@" ".join(find_kernel_feature_dirs(d))}"
 
-	# add any explicitly referenced features onto the end of the feature
-	# list that is passed to the kernel build scripts.
-	if [ -n "${KERNEL_FEATURES}" ]; then
-		for feat in ${KERNEL_FEATURES}; do
-			addon_features="$addon_features --feature $feat"
-		done
-	fi
-
 	# check for feature directories/repos/branches that were part of the
 	# SRC_URI. If they were supplied, we convert them into include directives
 	# for the update part of the process
-	if [ -n "${feat_dirs}" ]; then
-	    for f in ${feat_dirs}; do
+	for f in ${feat_dirs}; do
 		if [ -d "${WORKDIR}/$f/meta" ]; then
-		    includes="$includes -I${WORKDIR}/$f/meta"
+			includes="$includes -I${WORKDIR}/$f/meta"
 		elif [ -d "${WORKDIR}/$f" ]; then
-		    includes="$includes -I${WORKDIR}/$f"
+			includes="$includes -I${WORKDIR}/$f"
 		fi
-	    done
-	fi
+	done
+	for s in ${sccs}; do
+		sdir=$(dirname $s)
+		includes="$includes -I${sdir}"
+	done
 
-	# updates or generates the target description
-	updateme ${updateme_flags} -DKDESC=${KMACHINE}:${LINUX_KERNEL_TYPE} \
-                         ${includes} ${addon_features} ${ARCH} ${KMACHINE} ${sccs} ${patches}
-	if [ $? -ne 0 ]; then
-		bbfatal_log "Could not update ${machine_branch}"
-	fi
+	# expand kernel features into their full path equivalents
+	bsp_definition=$(spp ${includes} --find -DKMACHINE=${KMACHINE} -DKTYPE=${LINUX_KERNEL_TYPE})
+	meta_dir=$(kgit --meta)
+
+	# run1: pull all the configuration fragments, no matter where they come from
+	scc --force -o ${S}/${meta_dir}:cfg,meta ${includes} ${bsp_definition} ${sccs} ${patches} ${KERNEL_FEATURES}
+
+	# run2: only generate patches for elements that have been passed on the SRC_URI
+	scc --force -o ${S}/${meta_dir}:patch --cmds patch ${includes} ${sccs} ${patches} ${KERNEL_FEATURES}
 }
 
 do_patch() {
 	cd ${S}
 
-	# executes and modifies the source tree as required
-	patchme ${KMACHINE}
-	if [ $? -ne 0 ]; then
-		bberror "Could not apply patches for ${KMACHINE}."
-		bbfatal_log "Patch failures can be resolved in the linux source directory ${S})"
-	fi
-
-	# check to see if the specified SRCREV is reachable from the final branch.
-	# if it wasn't something wrong has happened, and we should error.
-	machine_srcrev="${SRCREV_machine}"
-	if [ -z "${machine_srcrev}" ]; then
-		# fallback to SRCREV if a non machine_meta tree is being built
-		machine_srcrev="${SRCREV}"
-		# if SRCREV cannot be reached something is wrong.
-		if [ -z "${machine_srcrev}" ]; then
-			bbfatal "Neither SRCREV_machine or SRCREV was specified!"
-		fi
-	fi
-
-        if [ -n "${KMETA_AUDIT}" ]; then
-            current_branch=`git rev-parse --abbrev-ref HEAD`
-            machine_branch="${@ get_machine_branch(d, "${KBRANCH}" )}"
-            if [ "${current_branch}" != "${machine_branch}" ]; then
-                bbwarn "After meta data application, the kernel tree branch is ${current_branch}."
-                bbwarn "The SRC_URI specified branch ${machine_branch}."
-                bbwarn ""
-                bbwarn "The branch will be forced to ${machine_branch}, but this means the board meta data"
-                bbwarn "(.scc files) do not match the SRC_URI specification."
-                bbwarn ""
-                bbwarn "The meta data and branch ${machine_branch} should be inspected to ensure the proper"
-                bbwarn "kernel is being built."
-                git checkout -f ${machine_branch}
-            fi
-        fi
-
-	if [ "${machine_srcrev}" != "AUTOINC" ]; then
-		if ! [ "$(git rev-parse --verify ${machine_srcrev}~0)" = "$(git merge-base ${machine_srcrev} HEAD)" ]; then
-			bberror "SRCREV ${machine_srcrev} was specified, but is not reachable"
-			bbfatal "Check the BSP description for incorrect branch selection, or other errors."
+	meta_dir=$(kgit --meta)
+	(cd ${meta_dir}; ln -sf patch.queue series)
+	if [ -f "${meta_dir}/series" ]; then
+		kgit-s2q --gen -v --patches .kernel-meta/
+		if [ $? -ne 0 ]; then
+			bberror "Could not apply patches for ${KMACHINE}."
+			bbfatal_log "Patch failures can be resolved in the linux source directory ${S})"
 		fi
 	fi
 }
@@ -258,26 +223,37 @@ do_kernel_metadata[depends] = "kern-tools-native:do_populate_sysroot"
 
 do_kernel_configme[dirs] += "${S} ${B}"
 do_kernel_configme() {
-	bbnote "kernel configme"
-	export KMETA=${KMETA}
+	set +e
 
-	if [ -n "${KCONFIG_MODE}" ]; then
-		configmeflags=${KCONFIG_MODE}
-	else
-		# If a defconfig was passed, use =n as the baseline, which is achieved
-		# via --allnoconfig
+	# translate the kconfig_mode into something that merge_config.sh
+	# understands
+	case ${KCONFIG_MODE} in
+		allnoconfig)
+			config_flags="-n"
+			;;
+		alldefconfig)
+			config_flags=""
+			;;
+	    *)
 		if [ -f ${WORKDIR}/defconfig ]; then
-			configmeflags="--allnoconfig"
+			config_flags="-n"
 		fi
-	fi
+	    ;;
+	esac
 
 	cd ${S}
-	PATH=${PATH}:${S}/scripts/util
-	configme ${configmeflags} --reconfig --output ${B} ${LINUX_KERNEL_TYPE} ${KMACHINE}
+
+	meta_dir=$(kgit --meta)
+	configs="$(scc --configs -o ${meta_dir})"
+	if [ -z "${configs}" ]; then
+		bbfatal_log "Could not find configuration queue (${meta_dir}/config.queue)"
+	fi
+
+	ARCH=${ARCH} merge_config.sh -O ${B} ${config_flags} ${configs} > ${meta_dir}/cfg/merge_config_build.log 2>&1
 	if [ $? -ne 0 ]; then
 		bbfatal_log "Could not configure ${KMACHINE}-${LINUX_KERNEL_TYPE}"
 	fi
-	
+
 	echo "# Global settings from linux recipe" >> ${B}/.config
 	echo "CONFIG_LOCALVERSION="\"${LINUX_VERSION_EXTENSION}\" >> ${B}/.config
 }
@@ -295,36 +271,23 @@ python do_kernel_configcheck() {
         kmeta = "." + kmeta
 
     pathprefix = "export PATH=%s:%s; " % (d.getVar('PATH', True), "${S}/scripts/util/")
-    cmd = d.expand("cd ${S}; kconf_check -config %s/meta-series ${S} ${B}" % kmeta)
+
+    cmd = d.expand("scc --configs -o ${S}/.kernel-meta")
+    ret, configs = oe.utils.getstatusoutput("%s%s" % (pathprefix, cmd))
+
+    cmd = d.expand("cd ${S}; kconf_check --report -o ${S}/%s/cfg/ ${B}/.config ${S} %s" % (kmeta,configs))
     ret, result = oe.utils.getstatusoutput("%s%s" % (pathprefix, cmd))
 
     config_check_visibility = int(d.getVar( "KCONF_AUDIT_LEVEL", True ) or 0)
     bsp_check_visibility = int(d.getVar( "KCONF_BSP_AUDIT_LEVEL", True ) or 0)
 
     # if config check visibility is non-zero, report dropped configuration values
-    mismatch_file = "${S}/" + kmeta + "/" + "mismatch.cfg"
+    mismatch_file = d.expand("${S}/%s/cfg/mismatch.txt" % kmeta)
     if os.path.exists(mismatch_file):
         if config_check_visibility:
             with open (mismatch_file, "r") as myfile:
                 results = myfile.read()
                 bb.warn( "[kernel config]: specified values did not make it into the kernel's final configuration:\n\n%s" % results)
-
-    # if config check visibility is level 2 or higher, report non-hardware options
-    nonhw_file = "${S}/" + kmeta + "/" + "nonhw_report.cfg"
-    if os.path.exists(nonhw_file):
-        if config_check_visibility > 1:
-            with open (nonhw_file, "r") as myfile:
-                results = myfile.read()
-                bb.warn( "[kernel config]: BSP specified non-hw configuration:\n\n%s" % results)
-
-    bsp_desc = "${S}/" + kmeta + "/" + "top_tgt"
-    if os.path.exists(bsp_desc) and bsp_check_visibility > 1:
-        with open (bsp_desc, "r") as myfile:
-            bsp_tgt = myfile.read()
-            m = re.match("^(.*)scratch.obj(.*)$", bsp_tgt)
-            if not m is None:
-                bb.warn( "[kernel]: An auto generated BSP description was used, this normally indicates a misconfiguration.\n" +
-                         "Check that your machine (%s) has an associated kernel description." % "${MACHINE}" )
 }
 
 # Ensure that the branches (BSP and meta) are on the locations specified by