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Code Pull requests 2 Activity Actions

speed up kernel build

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by having two separate derivations for patching the kernel source tree
and building it, we have to copy said source trees from one store
location to another which takes non-neglible time on spinning rust
(literally minutes on my machine). Replace with a single derivation
that can do more things on one tree in-place
This commit is contained in:
Daniel Barlow 2022-10-19 17:34:22 +01:00
parent d1dda7bf74
commit f1b7780537
7 changed files with 77 additions and 101 deletions
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31
default.nix
View file

@ -17,20 +17,31 @@ let
(if phram then ./modules/phram.nix else (args: {}))
] nixpkgs;
squashfs = liminix.builders.squashfs config.filesystem.contents;
kernel = callPackage ./kernel {
inherit (config.kernel) config checkedConfig;
openwrt = fetchFromGitHub {
name = "openwrt-source";
repo = "openwrt";
owner = "openwrt";
rev = "a5265497a4f6da158e95d6a450cb2cb6dc085cab";
hash = "sha256-YYi4gkpLjbOK7bM2MGQjAyEBuXJ9JNXoz/JEmYf8xE8=";
};
outputs = rec {
inherit squashfs kernel;
dtb = kernel.dtb {
dts = "qca9531_glinet_gl-ar750.dts";
inherit squashfs;
kernel = nixpkgs.kernel.override {
inherit (config.kernel) config checkedConfig;
};
uimage = kernel.uimage {
dtb = (callPackage ./kernel/dtb.nix {}) {
dts = "${openwrt}/target/linux/ath79/dts/qca9531_glinet_gl-ar750.dts";
includes = [
"${openwrt}/target/linux/ath79/dts"
"${kernel.headers}/include"
];
};
uimage = (callPackage ./kernel/uimage.nix {}) {
commandLine = concatStringsSep " " config.boot.commandLine;
inherit (device.boot) loadAddress entryPoint;
inherit (kernel) vmlinux;
inherit kernel;
inherit dtb;
};
combined-image = nixpkgs.runCommand "firmware.bin" {
@ -60,9 +71,9 @@ let
mkdir $out
cd $out
ln -s ${squashfs} squashfs
ln -s ${kernel.vmlinux} vmlinux
ln -s ${kernel} vmlinux
ln -s ${manifest} manifest
ln -s ${kernel.vmlinux.modulesupport} build
ln -s ${kernel.headers} build
'' +
(if device ? boot then ''
ln -s ${uimage} uimage

48
devices/gl-ar750/default.nix
View file

@ -32,36 +32,21 @@
overlay = final: prev:
let
inherit (final) fetchFromGitHub fetchgit stdenvNoCC;
openwrt = fetchFromGitHub {
openwrt = final.fetchFromGitHub {
name = "openwrt-source";
repo = "openwrt";
owner = "openwrt";
rev = "a5265497a4f6da158e95d6a450cb2cb6dc085cab";
hash = "sha256-YYi4gkpLjbOK7bM2MGQjAyEBuXJ9JNXoz/JEmYf8xE8=";
};
mainline = fetchFromGitHub {
name = "kernel-source";
owner = "torvalds";
repo = "linux";
rev = "90c7e9b400c751dbd73885f494f421f90ca69721";
hash = "sha256-pq6QNa0PJVeheaZkuvAPD0rLuEeKrViKk65dz+y4kqo=";
};
in {
sources = {
inherit openwrt;
kernel = stdenvNoCC.mkDerivation {
name = "spindled-kernel-tree";
src = mainline;
phases = [
"unpackPhase" "patchPhase" "openWrtPatchPhase"
"patchScripts" "installPhase"
];
patches = [ ../../kernel/random.patch ];
patchScripts = ''
patchShebangs scripts/
'';
openWrtPatchPhase = ''
kernel = prev.kernel.override {
src = final.fetchurl {
name = "linux.tar.gz";
url = "https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.15.71.tar.gz";
hash = "sha256-yhO2cXIeIgUxkSZf/4aAsF11uxyh+UUZu6D1h92vCD8=";
};
extraPatchPhase = ''
cp -av ${openwrt}/target/linux/generic/files/* .
chmod -R u+w .
cp -av ${openwrt}/target/linux/ath79/files/* .
@ -74,11 +59,6 @@
patches ${openwrt}/target/linux/generic/hack-5.15/*.patch
patches ${openwrt}/target/linux/ath79/patches-5.15/*.patch
'';
installPhase = ''
mkdir -p $out
cp -a . $out
'';
};
};
};
kernel = rec {
@ -88,8 +68,6 @@
USE_OF = "y";
ATH79 = "y";
LIMINIX = "y";
SERIAL_8250_CONSOLE = "y";
SERIAL_8250 = "y";
SERIAL_CORE_CONSOLE = "y";
@ -118,9 +96,10 @@
AG71XX = "y"; # ethernet (qca,qca9530-eth)
MFD_SYSCON = "y"; # ethernet (compatible "syscon")
AR8216_PHY = "y"; # eth1 is behind a switch
};
config = {
CPU_LITTLE_ENDIAN= "n";
MTD = "y";
MTD_CMDLINE_PARTS = "y";
MTD_BLOCK = "y"; # fix undefined ref to register_mtd_blktrans_devs
CPU_BIG_ENDIAN= "y";
# this is all copied from nixwrt ath79 config. Clearly not all
@ -128,7 +107,6 @@
# installation method config or ...
"CMDLINE_PARTITION" = "y";
"DEBUG_INFO" = "y";
"EARLY_PRINTK" = "y";
"FW_LOADER" = "y";
# we don't have a user helper, so we get multiple 60s pauses
@ -136,7 +114,7 @@
"FW_LOADER_USER_HELPER" = "n";
"MODULE_SIG" = "y";
"MTD_CMDLINE_PARTS" = "y";
"PARTITION_ADVANCED" = "y";
"PRINTK_TIME" = "y";
"SQUASHFS" = "y";

32
devices/qemu/default.nix
View file

@ -16,30 +16,14 @@
overlay = final: prev:
let inherit (final) stdenvNoCC fetchFromGitHub;
in {
sources = {
kernel =
let src = fetchFromGitHub {
name = "kernel-source";
owner = "torvalds";
repo = "linux";
rev = "3d7cb6b04c3f3115719235cc6866b10326de34cd"; # v5.19
hash = "sha256-OVsIRScAnrPleW1vbczRAj5L/SGGht2+GnvZJClMUu4=";
};
in stdenvNoCC.mkDerivation {
name = "spindled-kernel-tree";
inherit src;
phases = [
"unpackPhase"
"patchScripts" "installPhase"
];
patchScripts = ''
patchShebangs scripts/
'';
installPhase = ''
mkdir -p $out
cp -a . $out
'';
kernel = prev.kernel.override {
# using fetchurl not fetchzip because it doesn't unpack, and
# copying 6GB of data from one store location to another
# takes an absolute bloody age
src = final.fetchurl {
name = "linux.tar.gz";
url = "https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.19.16.tar.gz";
hash = "sha256-m4NeoEsCEK0HSIKTZ6zYTgk1fD3W0PSOMXN6fyHpkP8=";
};
};
};

9
kernel/dtb.nix
View file

@ -1,15 +1,10 @@
{
stdenv
, openwrt
, dtc
, kernel
}:
{ dts
, includes
}:let
includes = [
"${openwrt}/target/linux/ath79/dts"
"${kernel}/include"
];
cppDtSearchFlags = builtins.concatStringsSep " " (map (f: "-I${f}") includes);
dtcSearchFlags = builtins.concatStringsSep " " (map (f: "-i${f}") includes);
in stdenv.mkDerivation {
@ -17,7 +12,7 @@ in stdenv.mkDerivation {
phases = [ "buildPhase" ];
nativeBuildInputs = [ dtc ];
buildPhase = ''
${stdenv.cc.targetPrefix}cpp -nostdinc -x assembler-with-cpp ${cppDtSearchFlags} -undef -D__DTS__ -o dtb.tmp ${openwrt}/target/linux/ath79/dts/${dts}
${stdenv.cc.targetPrefix}cpp -nostdinc -x assembler-with-cpp ${cppDtSearchFlags} -undef -D__DTS__ -o dtb.tmp ${dts}
dtc ${dtcSearchFlags} -I dts -O dtb -o $out dtb.tmp
test -e $out
'';

4
kernel/uimage.nix
View file

@ -7,7 +7,7 @@
let
objcopy = "${stdenv.cc.bintools.targetPrefix}objcopy";
in {
vmlinux
kernel
, commandLine
, entryPoint
, extraName ? "" # e.g. socFamily
@ -28,7 +28,7 @@ stdenv.mkDerivation {
ubootTools
];
preparePhase = ''
cp ${vmlinux} vmlinux.elf; chmod +w vmlinux.elf
cp ${kernel} vmlinux.elf; chmod +w vmlinux.elf
'';
dtbPhase = ''
dtc -I dtb -O dts -o tmp.dts ${dtb}

1
overlay.nix
View file

@ -12,6 +12,7 @@ final: prev: {
s6-init-bin = final.callPackage ./pkgs/s6-init-bin {};
s6-rc-database = final.callPackage ./pkgs/s6-rc-database {};
kernel = final.callPackage ./pkgs/kernel {};
dnsmasq =
let d = prev.dnsmasq.overrideAttrs(o: {

29
kernel/vmlinux.nix → pkgs/kernel/default.nix
View file

@ -6,7 +6,8 @@
, config
, checkedConfig ? {}
, tree
, src
, extraPatchPhase ? "true"
} :
let writeConfig = name : config: writeText name
(builtins.concatStringsSep
@ -30,8 +31,8 @@ let writeConfig = name : config: writeText name
checkedConfigFile = writeConfig "checked_kconfig" checkedConfig ;
inherit lib; in
stdenv.mkDerivation rec {
name = "vmlinux";
name = "kernel";
inherit src extraPatchPhase;
hardeningDisable = ["all"];
nativeBuildInputs = [buildPackages.stdenv.cc] ++
(with buildPackages.pkgs;
@ -44,11 +45,16 @@ stdenv.mkDerivation rec {
PKG_CONFIG_PATH = "./pkgconfig";
CROSS_COMPILE = stdenv.cc.bintools.targetPrefix;
ARCH = "mips"; # kernel uses "mips" here for both mips and mipsel
KBUILD_BUILD_HOST = "liminix.builder";
dontStrip = true;
dontPatchELF = true;
outputs = ["out" "modulesupport"];
outputs = ["out" "headers"];
phases = [
"unpackPhase"
"butcherPkgconfig"
"extraPatchPhase"
"patchScripts"
"configurePhase"
"checkConfigurationPhase"
"buildPhase"
@ -67,12 +73,16 @@ stdenv.mkDerivation rec {
for i in pkgconfig/*.pc; do test -f $i && sed -i 's/^Libs:/Libs: -L''${libdir} /' $i;done
'';
patchScripts = ''
patchShebangs scripts/
'';
configurePhase = ''
export KBUILD_OUTPUT=`pwd`
cp ${kconfigFile} .config
cp ${kconfigFile} .config.orig
cp ${kconfigLocal} Kconfig.local
( cd ${tree} && make V=1 olddefconfig )
make V=1 olddefconfig
'';
checkConfigurationPhase = ''
@ -84,18 +94,15 @@ stdenv.mkDerivation rec {
echo "OK"
'';
KBUILD_BUILD_HOST = "liminix.builder";
buildPhase = ''
make -C ${tree} vmlinux modules_prepare
make vmlinux modules_prepare
'';
installPhase = ''
${CROSS_COMPILE}strip -d vmlinux
cp vmlinux $out
mkdir -p $modulesupport
cp .config $modulesupport/config
make clean
cp -a . $modulesupport
mkdir -p $headers
cp -a include .config $headers/
'';
}