rtla: add recipe for real-time linux analysis tool

rtla source code is present in the kernel source tree at tools/tracing/rtla.
There is another build option for rtla to enable bpf bindings, this was
not a quick one to get working and left as a future improvement.

Makefile for rtla has evolved in newer kernels (v6.9). Some fixes needed for
support with older kernels. This commit was tested against 6.18 and 6.8.

Also add rtla to packagegroup-meta-oe-benchmarks.

Signed-off-by: Peter Bergin <peter@berginkonsult.se>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

2 files changed, 48 insertions, 0 deletions

diff --git a/meta-oe/recipes-core/packagegroups/packagegroup-meta-oe.bb b/meta-oe/recipes-core/packagegroups/packagegroup-meta-oe.bb
index 9fd7af6c08..0cbe3964c4 100644
--- a/meta-oe/recipes-core/packagegroups/packagegroup-meta-oe.bb
+++ b/meta-oe/recipes-core/packagegroups/packagegroup-meta-oe.bb
@@ -68,6 +68,7 @@ RDEPENDS:packagegroup-meta-oe-benchmarks = "\
     nbench-byte \
     phoronix-test-suite \
     qperf \
+    rtla \
     s-suite \
     stressapptest \
     tinymembench \
diff --git a/meta-oe/recipes-kernel/rtla/rtla.bb b/meta-oe/recipes-kernel/rtla/rtla.bb
new file mode 100644
index 0000000000..829804c4ea
--- /dev/null
+++ b/meta-oe/recipes-kernel/rtla/rtla.bb
@@ -0,0 +1,47 @@
+SUMMARY = "Real-Time Linux Analysis tool"
+LICENSE = "GPL-2.0-only"
+
+DEPENDS = "libtraceevent libtracefs"
+PROVIDES = "virtual/rtla"
+
+B = "${WORKDIR}/${BPN}-${PV}"
+
+inherit kernelsrc kernel-arch pkgconfig
+
+do_populate_lic[depends] += "virtual/kernel:do_shared_workdir"
+
+PACKAGECONFIG ??= ""
+PACKAGECONFIG[cpupower] = ",,cpupower"
+
+EXTRA_OEMAKE = "V=1 -C ${S}/tools/tracing/rtla O=${B} CROSS=${TARGET_PREFIX} \
+    CC="${CC} ${DEBUG_PREFIX_MAP} -D_GNU_SOURCE" LD="${LD}" AR=${AR} ARCH=${ARCH} \
+    BUILD_BPF_SKEL=0"
+
+do_compile() {
+    # Older kernels (before 6.9) use a standalone rtla Makefile that does not honor
+    # O= so outputs land in the kernel source tree (shared workdir). Remove
+    # build output to make sure it is rebuilt. For newer kernels this wil be a no-op.
+    rm -f ${S}/tools/tracing/rtla/rtla
+    rm -f ${S}/tools/tracing/rtla/src/*.o
+
+    # Older kernels need additional variable EXTRA_LDFLAGS to pick up correct linker options.
+    export EXTRA_LDFLAGS="${LDFLAGS}"
+    oe_runmake
+}
+
+do_install() {
+    install -d ${D}${bindir}
+
+    # Older kernels (before 6.9) use a standalone rtla Makefile that does not honor
+    # O= for the final binary, so it ends up in the kernel source tree.
+    rtla_bin="${B}/rtla"
+    [ -f "${rtla_bin}" ] || rtla_bin="${S}/tools/tracing/rtla/rtla"
+    install -m 755 "${rtla_bin}" ${D}${bindir}/rtla
+
+    # rtla, osnoise, hwnoise, and timerlat are all the same binary
+    ln -s rtla ${D}${bindir}/osnoise
+    ln -s rtla ${D}${bindir}/hwnoise
+    ln -s rtla ${D}${bindir}/timerlat
+}
+
+PACKAGE_ARCH = "${MACHINE_ARCH}"