pyrox.dev
1# WARNING/NOTE: whenever you want to add an option here you need to either
2# * mark it as an optional one with `option`,
3# * or make sure it works for all the versions in nixpkgs,
4# * or check for which kernel versions it will work (using kernel
5# changelog, google or whatever) and mark it with `whenOlder` or
6# `whenAtLeast`.
7# Then do test your change by building all the kernels (or at least
8# their configs) in Nixpkgs or else you will guarantee lots and lots
9# of pain to users trying to switch to an older kernel because of some
10# hardware problems with a new one.
11
12# Configuration
13{
14 lib,
15 stdenv,
16 version,
17 rustAvailable,
18
19 features ? { },
20}:
21
22with lib.kernel;
23with (lib.kernel.whenHelpers version);
24
25let
26 # configuration items have to be part of a subattrs
27 flattenKConf =
28 nested:
29 lib.mapAttrs (
30 name: values:
31 if lib.length values == 1 then
32 lib.head values
33 else
34 throw "duplicate kernel configuration option: ${name}"
35 ) (lib.zipAttrs (lib.attrValues nested));
36
37 whenPlatformHasEBPFJit = lib.mkIf (
38 stdenv.hostPlatform.isAarch32
39 || stdenv.hostPlatform.isAarch64
40 || stdenv.hostPlatform.isx86_64
41 || (stdenv.hostPlatform.isPower && stdenv.hostPlatform.is64bit)
42 || (stdenv.hostPlatform.isMips && stdenv.hostPlatform.is64bit)
43 );
44
45 forceRust = features.rust or false;
46 # Architecture support collected from HAVE_RUST Kconfig definitions and the following table:
47 # https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/rust/arch-support.rst
48 rustByDefault = (
49 lib.versionAtLeast version "6.12"
50 && (
51 stdenv.hostPlatform.isx86_64
52 || stdenv.hostPlatform.isLoongArch64
53 || stdenv.hostPlatform.isAarch64
54 || (stdenv.hostPlatform.isRiscV64 && !stdenv.cc.isGNU)
55 )
56 );
57
58 withRust =
59 lib.warnIfNot (forceRust -> rustAvailable)
60 "force-enabling Rust for Linux without an available rustc"
61 lib.warnIfNot
62 (forceRust -> rustByDefault)
63 "force-enabling Rust for Linux on an unsupported kernel version, host platform or compiler"
64 (forceRust || (rustAvailable && rustByDefault));
65
66 options = {
67
68 debug = {
69 # Necessary for BTF and crashkernel
70 DEBUG_INFO = yes;
71 DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT = whenAtLeast "5.18" yes;
72 # Reduced debug info conflict with BTF and have been enabled in
73 # aarch64 defconfig since 5.13
74 DEBUG_INFO_REDUCED = whenAtLeast "5.13" (option no);
75 DEBUG_INFO_BTF = option yes;
76 # Allow loading modules with mismatched BTFs
77 # FIXME: figure out how to actually make BTFs reproducible instead
78 # See https://github.com/NixOS/nixpkgs/pull/181456 for details.
79 MODULE_ALLOW_BTF_MISMATCH = whenAtLeast "5.18" (option yes);
80 BPF_LSM = whenAtLeast "5.7" (option yes);
81 DEBUG_KERNEL = yes;
82 DEBUG_DEVRES = no;
83 DYNAMIC_DEBUG = yes;
84 DEBUG_STACK_USAGE = no;
85 RCU_TORTURE_TEST = no;
86 SCHEDSTATS = yes;
87 DETECT_HUNG_TASK = yes;
88 CRASH_DUMP = yes;
89 # Easier debugging of NFS issues.
90 SUNRPC_DEBUG = yes;
91 # Provide access to tunables like sched_migration_cost_ns
92 SCHED_DEBUG = whenOlder "6.15" yes;
93
94 # Count IRQ and steal CPU time separately
95 IRQ_TIME_ACCOUNTING = yes;
96 PARAVIRT_TIME_ACCOUNTING = yes;
97
98 # Enable CPU lockup detection
99 LOCKUP_DETECTOR = yes;
100 SOFTLOCKUP_DETECTOR = yes;
101 HARDLOCKUP_DETECTOR = lib.mkIf (
102 with stdenv.hostPlatform; isPower || isx86 || lib.versionAtLeast version "6.5"
103 ) yes;
104
105 # Enable streaming logs to a remote device over a network
106 NETCONSOLE = module;
107 NETCONSOLE_DYNAMIC = yes;
108
109 # Export known printks in debugfs
110 PRINTK_INDEX = whenAtLeast "5.15" yes;
111
112 # Enable crashkernel support
113 PROC_VMCORE = yes;
114
115 # Track memory leaks and performance issues related to allocations.
116 MEM_ALLOC_PROFILING = whenAtLeast "6.10" yes;
117 MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT = whenAtLeast "6.10" yes;
118 };
119
120 power-management =
121 {
122 CPU_FREQ_DEFAULT_GOV_SCHEDUTIL = yes;
123 CPU_FREQ_GOV_SCHEDUTIL = yes;
124 PM_DEBUG = yes;
125 PM_ADVANCED_DEBUG = yes;
126 PM_WAKELOCKS = yes;
127 POWERCAP = yes;
128 # ACPI Firmware Performance Data Table Support
129 ACPI_FPDT = whenAtLeast "5.12" (option yes);
130 # ACPI Heterogeneous Memory Attribute Table Support
131 ACPI_HMAT = option yes;
132 # ACPI Platform Error Interface
133 ACPI_APEI = (option yes);
134 # APEI Generic Hardware Error Source
135 ACPI_APEI_GHES = (option yes);
136
137 # Enable lazy RCUs for power savings:
138 # https://lore.kernel.org/rcu/20221019225138.GA2499943@paulmck-ThinkPad-P17-Gen-1/
139 # RCU_LAZY depends on RCU_NOCB_CPU depends on NO_HZ_FULL
140 # depends on HAVE_VIRT_CPU_ACCOUNTING_GEN depends on 64BIT,
141 # so we can't force-enable this
142 RCU_LAZY = whenAtLeast "6.2" (option yes);
143
144 # Auto suspend Bluetooth devices at idle
145 BT_HCIBTUSB_AUTOSUSPEND = yes;
146
147 # Expose cpufreq stats in sysfs
148 CPU_FREQ_STAT = yes;
149
150 # Enable CPU energy model for scheduling
151 ENERGY_MODEL = whenAtLeast "5.0" yes;
152
153 # Enable thermal interface netlink API
154 THERMAL_NETLINK = whenAtLeast "5.9" yes;
155
156 # Prefer power-efficient workqueue implementation to per-CPU workqueues,
157 # which is slightly slower, but improves battery life.
158 # This is opt-in per workqueue, and can be disabled globally with a kernel command line option.
159 WQ_POWER_EFFICIENT_DEFAULT = yes;
160
161 # Default SATA link power management to "medium with device initiated PM"
162 # for some extra power savings.
163 SATA_MOBILE_LPM_POLICY = whenAtLeast "5.18" (freeform "3");
164
165 # GPIO power management
166 POWER_RESET_GPIO = option yes;
167 POWER_RESET_GPIO_RESTART = option yes;
168
169 # Enable Pulse-Width-Modulation support, commonly used for fan and backlight.
170 PWM = yes;
171 }
172 // lib.optionalAttrs (stdenv.hostPlatform.isx86) {
173 INTEL_IDLE = yes;
174 INTEL_RAPL = module;
175 X86_INTEL_LPSS = yes;
176 X86_INTEL_PSTATE = yes;
177 X86_AMD_PSTATE = whenAtLeast "5.17" yes;
178 # Intel DPTF (Dynamic Platform and Thermal Framework) Support
179 ACPI_DPTF = whenAtLeast "5.10" yes;
180
181 # Required to bring up some Bay Trail devices properly
182 I2C = yes;
183 I2C_DESIGNWARE_CORE = yes;
184 I2C_DESIGNWARE_PLATFORM = yes;
185 PMIC_OPREGION = whenAtLeast "5.10" yes;
186 INTEL_SOC_PMIC = whenAtLeast "5.10" yes;
187 BYTCRC_PMIC_OPREGION = whenAtLeast "5.10" yes;
188 CHTCRC_PMIC_OPREGION = whenAtLeast "5.10" yes;
189 XPOWER_PMIC_OPREGION = whenAtLeast "5.10" yes;
190 BXT_WC_PMIC_OPREGION = whenAtLeast "5.10" yes;
191 INTEL_SOC_PMIC_CHTWC = whenAtLeast "5.10" yes;
192 CHT_WC_PMIC_OPREGION = whenAtLeast "5.10" yes;
193 INTEL_SOC_PMIC_CHTDC_TI = whenAtLeast "5.10" yes;
194 CHT_DC_TI_PMIC_OPREGION = whenAtLeast "5.10" yes;
195 MFD_TPS68470 = whenBetween "5.10" "5.13" yes;
196 TPS68470_PMIC_OPREGION = whenAtLeast "5.10" yes;
197
198 # Enable Intel thermal hardware feedback
199 INTEL_HFI_THERMAL = whenAtLeast "5.18" yes;
200 };
201
202 external-firmware = {
203 # Support drivers that need external firmware.
204 STANDALONE = no;
205 };
206
207 proc-config-gz = {
208 # Make /proc/config.gz available
209 IKCONFIG = yes;
210 IKCONFIG_PROC = yes;
211 };
212
213 optimization = {
214 X86_GENERIC = lib.mkIf (stdenv.hostPlatform.system == "i686-linux") yes;
215 # Optimize with -O2, not -Os
216 CC_OPTIMIZE_FOR_SIZE = no;
217 };
218
219 memory =
220 {
221 DAMON = whenAtLeast "5.15" yes;
222 DAMON_VADDR = whenAtLeast "5.15" yes;
223 DAMON_PADDR = whenAtLeast "5.16" yes;
224 DAMON_SYSFS = whenAtLeast "5.18" yes;
225 DAMON_DBGFS = whenBetween "5.15" "6.9" yes;
226 DAMON_RECLAIM = whenAtLeast "5.16" yes;
227 DAMON_LRU_SORT = whenAtLeast "6.0" yes;
228 # Support recovering from memory failures on systems with ECC and MCA recovery.
229 MEMORY_FAILURE = yes;
230
231 # Collect ECC errors and retire pages that fail too often
232 RAS_CEC = lib.mkIf stdenv.hostPlatform.isx86 yes;
233 }
234 // lib.optionalAttrs (stdenv.hostPlatform.is32bit) {
235 # Enable access to the full memory range (aka PAE) on 32-bit architectures
236 # This check isn't super accurate but it's close enough
237 HIGHMEM = option yes;
238 BOUNCE = option yes;
239 };
240
241 memtest = {
242 MEMTEST = yes;
243 };
244
245 # Include the CFQ I/O scheduler in the kernel, rather than as a
246 # module, so that the initrd gets a good I/O scheduler.
247 scheduler = {
248 IOSCHED_CFQ = whenOlder "5.0" yes; # Removed in 5.0-RC1
249 BLK_CGROUP = yes; # required by CFQ"
250 BLK_CGROUP_IOLATENCY = yes;
251 BLK_CGROUP_IOCOST = yes;
252 IOSCHED_DEADLINE = whenOlder "5.0" yes; # Removed in 5.0-RC1
253 MQ_IOSCHED_DEADLINE = yes;
254 BFQ_GROUP_IOSCHED = yes;
255 MQ_IOSCHED_KYBER = yes;
256 IOSCHED_BFQ = module;
257 # Enable CPU utilization clamping for RT tasks
258 UCLAMP_TASK = yes;
259 UCLAMP_TASK_GROUP = yes;
260 };
261
262 timer = {
263 # Enable Full Dynticks System.
264 # NO_HZ_FULL depends on HAVE_VIRT_CPU_ACCOUNTING_GEN depends on 64BIT
265 NO_HZ_FULL = lib.mkIf stdenv.hostPlatform.is64bit yes;
266 };
267
268 # Enable NUMA.
269 numa = {
270 NUMA = option yes;
271 NUMA_BALANCING = option yes;
272 };
273
274 networking =
275 {
276 NET = yes;
277 IP_ADVANCED_ROUTER = yes;
278 IP_PNP = no;
279 IP_ROUTE_MULTIPATH = yes;
280 IP_VS_PROTO_TCP = yes;
281 IP_VS_PROTO_UDP = yes;
282 IP_VS_PROTO_ESP = yes;
283 IP_VS_PROTO_AH = yes;
284 IP_VS_IPV6 = yes;
285 IP_DCCP_CCID3 = no; # experimental
286 CLS_U32_PERF = yes;
287 CLS_U32_MARK = yes;
288 BPF_JIT = whenPlatformHasEBPFJit yes;
289 BPF_JIT_ALWAYS_ON = whenPlatformHasEBPFJit no; # whenPlatformHasEBPFJit yes; # see https://github.com/NixOS/nixpkgs/issues/79304
290 HAVE_EBPF_JIT = whenPlatformHasEBPFJit yes;
291 BPF_STREAM_PARSER = yes;
292 XDP_SOCKETS = yes;
293 XDP_SOCKETS_DIAG = yes;
294 WAN = yes;
295 TCP_CONG_ADVANCED = yes;
296 TCP_CONG_CUBIC = yes; # This is the default congestion control algorithm since 2.6.19
297 # Required by systemd per-cgroup firewalling
298 CGROUP_BPF = option yes;
299 CGROUP_NET_PRIO = yes; # Required by systemd
300 IP_ROUTE_VERBOSE = yes;
301 IP_MROUTE = yes;
302 IP_MROUTE_MULTIPLE_TABLES = yes;
303 IP_MULTICAST = yes;
304 IP_MULTIPLE_TABLES = yes;
305 IPV6 = yes;
306 IPV6_ROUTER_PREF = yes;
307 IPV6_ROUTE_INFO = yes;
308 IPV6_OPTIMISTIC_DAD = yes;
309 IPV6_MULTIPLE_TABLES = yes;
310 IPV6_SUBTREES = yes;
311 IPV6_MROUTE = yes;
312 IPV6_MROUTE_MULTIPLE_TABLES = yes;
313 IPV6_PIMSM_V2 = yes;
314 IPV6_FOU_TUNNEL = module;
315 IPV6_SEG6_LWTUNNEL = yes;
316 IPV6_SEG6_HMAC = yes;
317 IPV6_SEG6_BPF = yes;
318 NET_CLS_BPF = module;
319 NET_ACT_BPF = module;
320 NET_SCHED = yes;
321 L2TP_V3 = yes;
322 L2TP_IP = module;
323 L2TP_ETH = module;
324 BRIDGE_VLAN_FILTERING = yes;
325 BONDING = module;
326 NET_L3_MASTER_DEV = option yes;
327 NET_FOU_IP_TUNNELS = option yes;
328 IP_NF_TARGET_REDIRECT = module;
329 NETKIT = whenAtLeast "6.7" yes;
330
331 PPP_MULTILINK = yes; # PPP multilink support
332 PPP_FILTER = yes;
333
334 # needed for iwd WPS support (wpa_supplicant replacement)
335 KEY_DH_OPERATIONS = yes;
336
337 # needed for nftables
338 # Networking Options
339 NETFILTER = yes;
340 NETFILTER_ADVANCED = yes;
341 # Core Netfilter Configuration
342 NF_CONNTRACK_ZONES = yes;
343 NF_CONNTRACK_EVENTS = yes;
344 NF_CONNTRACK_TIMEOUT = yes;
345 NF_CONNTRACK_TIMESTAMP = yes;
346 NETFILTER_NETLINK_GLUE_CT = yes;
347 NF_TABLES_INET = yes;
348 NF_TABLES_NETDEV = yes;
349 NFT_REJECT_NETDEV = whenAtLeast "5.11" module;
350
351 # IP: Netfilter Configuration
352 NF_TABLES_IPV4 = yes;
353 NF_TABLES_ARP = yes;
354 # IPv6: Netfilter Configuration
355 NF_TABLES_IPV6 = yes;
356 # Bridge Netfilter Configuration
357 NF_TABLES_BRIDGE = module;
358 # Expose some debug info
359 NF_CONNTRACK_PROCFS = yes;
360 NF_FLOW_TABLE_PROCFS = whenAtLeast "6.0" yes;
361
362 # needed for `dropwatch`
363 # Builtin-only since https://github.com/torvalds/linux/commit/f4b6bcc7002f0e3a3428bac33cf1945abff95450
364 NET_DROP_MONITOR = yes;
365
366 # needed for ss
367 # Use a lower priority to allow these options to be overridden in hardened/config.nix
368 INET_DIAG = lib.mkDefault module;
369 INET_TCP_DIAG = lib.mkDefault module;
370 INET_UDP_DIAG = lib.mkDefault module;
371 INET_RAW_DIAG = lib.mkDefault module;
372 INET_DIAG_DESTROY = lib.mkDefault yes;
373
374 # IPsec over TCP
375 INET_ESPINTCP = whenAtLeast "5.8" yes;
376 INET6_ESPINTCP = whenAtLeast "5.8" yes;
377
378 # enable multipath-tcp
379 MPTCP = whenAtLeast "5.6" yes;
380 MPTCP_IPV6 = whenAtLeast "5.6" yes;
381 INET_MPTCP_DIAG = whenAtLeast "5.9" (lib.mkDefault module);
382
383 # Kernel TLS
384 TLS = module;
385 TLS_DEVICE = yes;
386
387 # infiniband
388 INFINIBAND = module;
389 INFINIBAND_IPOIB = module;
390 INFINIBAND_IPOIB_CM = yes;
391
392 # Enable debugfs for wireless drivers
393 CFG80211_DEBUGFS = yes;
394 MAC80211_DEBUGFS = yes;
395 }
396 // lib.optionalAttrs (stdenv.hostPlatform.system == "aarch64-linux") {
397 # Not enabled by default, hides modules behind it
398 NET_VENDOR_MEDIATEK = yes;
399 # Enable SoC interface for MT7915 module, required for MT798X.
400 MT7986_WMAC = whenBetween "5.18" "6.6" yes;
401 MT798X_WMAC = whenAtLeast "6.6" yes;
402 };
403
404 wireless = {
405 CFG80211_WEXT = option yes; # Without it, ipw2200 drivers don't build
406 IPW2100_MONITOR = option yes; # support promiscuous mode
407 IPW2200_MONITOR = option yes; # support promiscuous mode
408 HOSTAP_FIRMWARE = whenOlder "6.8" (option yes); # Support downloading firmware images with Host AP driver
409 HOSTAP_FIRMWARE_NVRAM = whenOlder "6.8" (option yes);
410 MAC80211_MESH = option yes; # Enable 802.11s (mesh networking) support
411 ATH9K_PCI = option yes; # Detect Atheros AR9xxx cards on PCI(e) bus
412 ATH9K_AHB = option yes; # Ditto, AHB bus
413 # The description of this option makes it sound dangerous or even illegal
414 # But OpenWRT enables it by default: https://github.com/openwrt/openwrt/blob/master/package/kernel/mac80211/Makefile#L55
415 # At the time of writing (25-06-2023): this is only used in a "correct" way by ath drivers for initiating DFS radiation
416 # for "certified devices"
417 EXPERT = option yes; # this is needed for offering the certification option
418 RFKILL_INPUT = option yes; # counteract an undesired effect of setting EXPERT
419 CFG80211_CERTIFICATION_ONUS = option yes;
420 # DFS: "Dynamic Frequency Selection" is a spectrum-sharing mechanism that allows
421 # you to use certain interesting frequency when your local regulatory domain mandates it.
422 # ATH drivers hides the feature behind this option and makes hostapd works with DFS frequencies.
423 # OpenWRT enables it too: https://github.com/openwrt/openwrt/blob/master/package/kernel/mac80211/ath.mk#L42
424 ATH9K_DFS_CERTIFIED = option yes;
425 ATH10K_DFS_CERTIFIED = option yes;
426 B43_PHY_HT = option yes;
427 BCMA_HOST_PCI = option yes;
428 RTW88 = module;
429 RTW88_8822BE = lib.mkMerge [
430 (whenOlder "5.8" yes)
431 (whenAtLeast "5.8" module)
432 ];
433 RTW88_8822CE = lib.mkMerge [
434 (whenOlder "5.8" yes)
435 (whenAtLeast "5.8" module)
436 ];
437 };
438
439 fb = {
440 FB = yes;
441 FB_EFI = yes;
442 FB_NVIDIA_I2C = yes; # Enable DDC Support
443 FB_RIVA_I2C = yes;
444 FB_ATY_CT = yes; # Mach64 CT/VT/GT/LT (incl. 3D RAGE) support
445 FB_ATY_GX = yes; # Mach64 GX support
446 FB_SAVAGE_I2C = yes;
447 FB_SAVAGE_ACCEL = yes;
448 FB_SIS_300 = yes;
449 FB_SIS_315 = yes;
450 FB_3DFX_ACCEL = yes;
451 FB_VESA = lib.mkIf stdenv.hostPlatform.isx86 yes;
452 FRAMEBUFFER_CONSOLE = yes;
453 FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER = yes;
454 FRAMEBUFFER_CONSOLE_ROTATION = yes;
455 FRAMEBUFFER_CONSOLE_DETECT_PRIMARY = yes;
456 FB_GEODE = lib.mkIf (stdenv.hostPlatform.system == "i686-linux") yes;
457 # Use simplefb on older kernels where we don't have simpledrm (enabled below)
458 FB_SIMPLE = whenOlder "5.15" yes;
459 DRM_FBDEV_EMULATION = yes;
460 };
461
462 fonts = {
463 FONTS = yes;
464 # Default fonts enabled if FONTS is not set
465 FONT_8x8 = yes;
466 FONT_8x16 = yes;
467 # High DPI font
468 FONT_TER16x32 = whenAtLeast "5.0" yes;
469 };
470
471 video =
472 let
473 whenHasDevicePrivate = lib.mkIf (!stdenv.hostPlatform.isx86_32);
474 in
475 {
476 # compile in DRM so simpledrm can load before initrd if necessary
477 AGP = lib.mkIf (with stdenv.hostPlatform; isPower || isx86) yes;
478 DRM = yes;
479
480 DRM_LEGACY = whenOlder "6.8" no;
481
482 # Must be the same as CONFIG_DRM
483 BACKLIGHT_CLASS_DEVICE = yes;
484
485 NOUVEAU_LEGACY_CTX_SUPPORT = whenOlder "6.3" no;
486
487 # Enable simpledrm and use it for generic framebuffer
488 # Technically added in 5.14, but adding more complex configuration is not worth it
489 DRM_SIMPLEDRM = whenAtLeast "5.15" yes;
490 SYSFB_SIMPLEFB = whenAtLeast "5.15" yes;
491
492 # Allow specifying custom EDID on the kernel command line
493 DRM_LOAD_EDID_FIRMWARE = yes;
494 VGA_SWITCHEROO = lib.mkIf stdenv.hostPlatform.isx86 yes; # Hybrid graphics support
495 DRM_GMA500 = lib.mkIf stdenv.hostPlatform.isx86 (whenAtLeast "5.12" module);
496 DRM_GMA600 = lib.mkIf stdenv.hostPlatform.isx86 (whenOlder "5.13" yes);
497 DRM_GMA3600 = lib.mkIf stdenv.hostPlatform.isx86 (whenOlder "5.12" yes);
498 DRM_VMWGFX_FBCON = lib.mkIf stdenv.hostPlatform.isx86 (whenOlder "6.1" yes);
499 # (experimental) amdgpu support for verde and newer chipsets
500 DRM_AMDGPU_SI = yes;
501 # (stable) amdgpu support for bonaire and newer chipsets
502 DRM_AMDGPU_CIK = yes;
503 # Allow device firmware updates
504 DRM_DP_AUX_CHARDEV = whenOlder "6.10" yes;
505 DRM_DISPLAY_DP_AUX_CHARDEV = whenAtLeast "6.10" yes;
506 # amdgpu display core (DC) support
507 DRM_AMD_DC_DCN1_0 = whenOlder "5.6" yes;
508 DRM_AMD_DC_DCN2_0 = whenOlder "5.6" yes;
509 DRM_AMD_DC_DCN2_1 = whenOlder "5.6" yes;
510 DRM_AMD_DC_DCN3_0 = lib.mkIf (with stdenv.hostPlatform; isx86) (whenBetween "5.9" "5.11" yes);
511 DRM_AMD_DC_DCN = lib.mkIf (with stdenv.hostPlatform; isx86 || isPower64) (
512 whenBetween "5.11" "6.4" yes
513 );
514 DRM_AMD_DC_FP = whenAtLeast "6.4" yes;
515 DRM_AMD_DC_HDCP = whenBetween "5.5" "6.4" yes;
516 DRM_AMD_DC_SI = whenAtLeast "5.10" yes;
517
518 # Enable AMD Audio Coprocessor support for HDMI outputs
519 DRM_AMD_ACP = yes;
520
521 # Enable AMD secure display when available
522 DRM_AMD_SECURE_DISPLAY = lib.mkIf (
523 with stdenv.hostPlatform;
524 (lib.versionAtLeast version "5.13" && (isx86 || isPower64))
525 || (lib.versionAtLeast version "6.2" && isAarch64 && !stdenv.cc.isClang)
526 || (lib.versionAtLeast version "6.5" && isLoongArch64 && !stdenv.cc.isClang)
527 || (lib.versionAtLeast version "6.10" && isRiscV64 && !stdenv.cc.isClang)
528 ) yes;
529
530 # Enable AMD image signal processor
531 DRM_AMD_ISP = whenAtLeast "6.11" yes;
532
533 # Enable new firmware (and by extension NVK) for compatible hardware on Nouveau
534 DRM_NOUVEAU_GSP_DEFAULT = whenAtLeast "6.8" yes;
535
536 # Enable Nouveau shared virtual memory (used by OpenCL)
537 DEVICE_PRIVATE = whenHasDevicePrivate yes;
538 DRM_NOUVEAU_SVM = whenHasDevicePrivate yes;
539
540 # Enable HDMI-CEC receiver support
541 RC_CORE = yes;
542 MEDIA_CEC_RC = whenAtLeast "5.10" yes;
543
544 # Enable CEC over DisplayPort
545 DRM_DP_CEC = whenOlder "6.10" yes;
546 DRM_DISPLAY_DP_AUX_CEC = whenAtLeast "6.10" yes;
547 }
548 // lib.optionalAttrs (stdenv.hostPlatform.system == "x86_64-linux") {
549 # Intel GVT-g graphics virtualization supports 64-bit only
550 DRM_I915_GVT = yes;
551 DRM_I915_GVT_KVMGT = module;
552 # Enable Hyper-V Synthetic DRM Driver
553 DRM_HYPERV = whenAtLeast "5.14" module;
554 # And disable the legacy framebuffer driver when we have the new one
555 FB_HYPERV = whenAtLeast "5.14" no;
556 }
557 // lib.optionalAttrs (stdenv.hostPlatform.system == "aarch64-linux") {
558 # enable HDMI-CEC on RPi boards
559 DRM_VC4_HDMI_CEC = yes;
560 # Enable HDMI out on platforms using the RK3588 lineup of SoCs.
561 ROCKCHIP_DW_HDMI_QP = whenAtLeast "6.13" yes;
562 };
563
564 # Enable Rust and features that depend on it
565 # Use a lower priority to allow these options to be overridden in hardened/config.nix
566 rust = lib.optionalAttrs withRust {
567 RUST = yes;
568
569 # These don't technically require Rust but we probably want to get some more testing
570 # on the whole DRM panic setup before shipping it by default.
571 DRM_PANIC = whenAtLeast "6.12" yes;
572 DRM_PANIC_SCREEN = whenAtLeast "6.12" (freeform "kmsg");
573
574 DRM_PANIC_SCREEN_QR_CODE = whenAtLeast "6.12" yes;
575 };
576
577 sound =
578 {
579 SND_DYNAMIC_MINORS = yes;
580 SND_AC97_POWER_SAVE = yes; # AC97 Power-Saving Mode
581 # 10s for the idle timeout, Fedora does 1, Arch does 10.
582 # The kernel says we should do 10.
583 # Read: https://docs.kernel.org/sound/designs/powersave.html
584 SND_AC97_POWER_SAVE_DEFAULT = freeform "10";
585 SND_HDA_POWER_SAVE_DEFAULT = freeform "10";
586 SND_HDA_INPUT_BEEP = yes; # Support digital beep via input layer
587 SND_HDA_RECONFIG = yes; # Support reconfiguration of jack functions
588 # Support configuring jack functions via fw mechanism at boot
589 SND_HDA_PATCH_LOADER = yes;
590 SND_HDA_CODEC_CA0132_DSP = whenOlder "5.7" yes; # Enable DSP firmware loading on Creative Soundblaster Z/Zx/ZxR/Recon
591 SND_HDA_CODEC_CS8409 = whenAtLeast "6.6" module; # Cirrus Logic HDA Bridge CS8409
592 SND_OSSEMUL = yes;
593 SND_USB_CAIAQ_INPUT = yes;
594 SND_USB_AUDIO_MIDI_V2 = whenAtLeast "6.5" yes;
595 # Enable Sound Open Firmware support
596 }
597 // lib.optionalAttrs
598 (stdenv.hostPlatform.system == "x86_64-linux" && lib.versionAtLeast version "5.5")
599 {
600 SND_SOC_INTEL_SOUNDWIRE_SOF_MACH = whenAtLeast "5.10" module;
601 SND_SOC_INTEL_USER_FRIENDLY_LONG_NAMES = whenAtLeast "5.10" yes; # dep of SOF_MACH
602 SND_SOC_SOF_INTEL_SOUNDWIRE_LINK = whenBetween "5.10" "5.11" yes; # dep of SOF_MACH
603 SND_SOC_SOF_TOPLEVEL = yes;
604 SND_SOC_SOF_ACPI = module;
605 SND_SOC_SOF_PCI = module;
606 SND_SOC_SOF_APOLLOLAKE = whenAtLeast "5.12" module;
607 SND_SOC_SOF_APOLLOLAKE_SUPPORT = whenOlder "5.12" yes;
608 SND_SOC_SOF_CANNONLAKE = whenAtLeast "5.12" module;
609 SND_SOC_SOF_CANNONLAKE_SUPPORT = whenOlder "5.12" yes;
610 SND_SOC_SOF_COFFEELAKE = whenAtLeast "5.12" module;
611 SND_SOC_SOF_COFFEELAKE_SUPPORT = whenOlder "5.12" yes;
612 SND_SOC_SOF_COMETLAKE = whenAtLeast "5.12" module;
613 SND_SOC_SOF_COMETLAKE_H_SUPPORT = whenOlder "5.8" yes;
614 SND_SOC_SOF_COMETLAKE_LP_SUPPORT = whenOlder "5.12" yes;
615 SND_SOC_SOF_ELKHARTLAKE = whenAtLeast "5.12" module;
616 SND_SOC_SOF_ELKHARTLAKE_SUPPORT = whenOlder "5.12" yes;
617 SND_SOC_SOF_GEMINILAKE = whenAtLeast "5.12" module;
618 SND_SOC_SOF_GEMINILAKE_SUPPORT = whenOlder "5.12" yes;
619 SND_SOC_SOF_HDA_AUDIO_CODEC = yes;
620 SND_SOC_SOF_HDA_COMMON_HDMI_CODEC = whenOlder "5.7" yes;
621 SND_SOC_SOF_HDA_LINK = yes;
622 SND_SOC_SOF_ICELAKE = whenAtLeast "5.12" module;
623 SND_SOC_SOF_ICELAKE_SUPPORT = whenOlder "5.12" yes;
624 SND_SOC_SOF_INTEL_TOPLEVEL = yes;
625 SND_SOC_SOF_JASPERLAKE = whenAtLeast "5.12" module;
626 SND_SOC_SOF_JASPERLAKE_SUPPORT = whenOlder "5.12" yes;
627 SND_SOC_SOF_MERRIFIELD = whenAtLeast "5.12" module;
628 SND_SOC_SOF_MERRIFIELD_SUPPORT = whenOlder "5.12" yes;
629 SND_SOC_SOF_TIGERLAKE = whenAtLeast "5.12" module;
630 SND_SOC_SOF_TIGERLAKE_SUPPORT = whenOlder "5.12" yes;
631 };
632
633 usb = {
634 USB = yes; # compile USB core into kernel, so we can use USB_SERIAL_CONSOLE before modules
635
636 USB_EHCI_ROOT_HUB_TT = yes; # Root Hub Transaction Translators
637 USB_EHCI_TT_NEWSCHED = yes; # Improved transaction translator scheduling
638 USB_HIDDEV = yes; # USB Raw HID Devices (like monitor controls and Uninterruptable Power Supplies)
639
640 # default to dual role mode
641 USB_DWC2_DUAL_ROLE = yes;
642 USB_DWC3_DUAL_ROLE = yes;
643 };
644
645 usb-serial = {
646 USB_SERIAL = yes;
647 USB_SERIAL_GENERIC = yes; # USB Generic Serial Driver
648 USB_SERIAL_CONSOLE = yes; # Allow using USB serial adapter as console
649 U_SERIAL_CONSOLE = whenAtLeast "5.10" yes; # Allow using USB gadget as console
650 };
651
652 # Filesystem options - in particular, enable extended attributes and
653 # ACLs for all filesystems that support them.
654 filesystem = {
655 FANOTIFY = yes;
656 FANOTIFY_ACCESS_PERMISSIONS = yes;
657
658 TMPFS = yes;
659 TMPFS_POSIX_ACL = yes;
660 FS_ENCRYPTION = yes;
661
662 EXT2_FS_XATTR = yes;
663 EXT2_FS_POSIX_ACL = yes;
664 EXT2_FS_SECURITY = yes;
665
666 EXT3_FS_POSIX_ACL = yes;
667 EXT3_FS_SECURITY = yes;
668
669 EXT4_FS_POSIX_ACL = yes;
670 EXT4_FS_SECURITY = yes;
671
672 NTFS_FS = whenBetween "5.15" "6.9" no;
673 NTFS3_LZX_XPRESS = whenAtLeast "5.15" yes;
674 NTFS3_FS_POSIX_ACL = whenAtLeast "5.15" yes;
675
676 REISERFS_FS_XATTR = option yes;
677 REISERFS_FS_POSIX_ACL = option yes;
678 REISERFS_FS_SECURITY = option yes;
679
680 JFS_POSIX_ACL = option yes;
681 JFS_SECURITY = option yes;
682
683 XFS_QUOTA = option yes;
684 XFS_POSIX_ACL = option yes;
685 XFS_RT = option yes; # XFS Realtime subvolume support
686 XFS_ONLINE_SCRUB = option yes;
687
688 OCFS2_DEBUG_MASKLOG = option no;
689
690 BTRFS_FS_POSIX_ACL = yes;
691
692 BCACHEFS_QUOTA = whenAtLeast "6.7" (option yes);
693 BCACHEFS_POSIX_ACL = whenAtLeast "6.7" (option yes);
694
695 UBIFS_FS_ADVANCED_COMPR = option yes;
696
697 F2FS_FS = module;
698 F2FS_FS_SECURITY = option yes;
699 F2FS_FS_COMPRESSION = whenAtLeast "5.6" yes;
700 UDF_FS = module;
701
702 NFSD_V2_ACL = whenOlder "5.10" yes;
703 NFSD_V3 = whenOlder "5.10" yes;
704 NFSD_V3_ACL = yes;
705 NFSD_V4 = yes;
706 NFSD_V4_SECURITY_LABEL = yes;
707
708 NFS_FS = module;
709 NFS_FSCACHE = yes;
710 NFS_SWAP = yes;
711 NFS_V3_ACL = yes;
712 NFS_V4_1 = yes; # NFSv4.1 client support
713 NFS_V4_2 = yes;
714 NFS_V4_SECURITY_LABEL = yes;
715 NFS_LOCALIO = whenAtLeast "6.12" yes;
716
717 CIFS_XATTR = yes;
718 CIFS_POSIX = option yes;
719 CIFS_FSCACHE = yes;
720 CIFS_WEAK_PW_HASH = whenOlder "5.15" yes;
721 CIFS_UPCALL = yes;
722 CIFS_DFS_UPCALL = yes;
723
724 CEPH_FSCACHE = yes;
725 CEPH_FS_POSIX_ACL = yes;
726
727 SQUASHFS_FILE_DIRECT = yes;
728 SQUASHFS_DECOMP_MULTI_PERCPU = whenOlder "6.2" yes;
729 SQUASHFS_CHOICE_DECOMP_BY_MOUNT = whenAtLeast "6.2" yes;
730 SQUASHFS_XATTR = yes;
731 SQUASHFS_ZLIB = yes;
732 SQUASHFS_LZO = yes;
733 SQUASHFS_XZ = yes;
734 SQUASHFS_LZ4 = yes;
735 SQUASHFS_ZSTD = yes;
736
737 # Native Language Support modules, needed by some filesystems
738 NLS = yes;
739 NLS_DEFAULT = freeform "utf8";
740 NLS_UTF8 = module;
741 NLS_CODEPAGE_437 = module; # VFAT default for the codepage= mount option
742 NLS_ISO8859_1 = module; # VFAT default for the iocharset= mount option
743
744 # Needed to use the installation iso image. Not included in all defconfigs (e.g. arm64)
745 ISO9660_FS = module;
746
747 DEVTMPFS = yes;
748
749 UNICODE = yes; # Casefolding support for filesystems
750 };
751
752 security =
753 {
754 # Report BUG() conditions and kill the offending process.
755 BUG = yes;
756 BUG_ON_DATA_CORRUPTION = yes;
757
758 FORTIFY_SOURCE = option yes;
759
760 # https://googleprojectzero.blogspot.com/2019/11/bad-binder-android-in-wild-exploit.html
761 DEBUG_LIST = yes;
762
763 HARDENED_USERCOPY = yes;
764 RANDOMIZE_BASE = option yes;
765 STRICT_KERNEL_RWX = yes;
766 STRICT_MODULE_RWX = yes;
767 STRICT_DEVMEM = lib.mkDefault yes; # Filter access to /dev/mem
768 IO_STRICT_DEVMEM = lib.mkDefault yes;
769
770 # Prevent processes from ptracing non-children processes
771 SECURITY_YAMA = option yes;
772 # The goal of Landlock is to enable to restrict ambient rights (e.g. global filesystem access) for a set of processes.
773 # This does not have any effect if a program does not support it
774 SECURITY_LANDLOCK = whenAtLeast "5.13" yes;
775
776 DEVKMEM = lib.mkIf (!stdenv.hostPlatform.isAarch64) (whenOlder "5.13" no); # Disable /dev/kmem
777
778 USER_NS = yes; # Support for user namespaces
779
780 SECURITY_APPARMOR = yes;
781 DEFAULT_SECURITY_APPARMOR = yes;
782
783 SECURITY_DMESG_RESTRICT = yes;
784
785 RANDOM_TRUST_CPU = whenOlder "6.2" yes; # allow RDRAND to seed the RNG
786 RANDOM_TRUST_BOOTLOADER = whenOlder "6.2" yes; # allow the bootloader to seed the RNG
787
788 MODULE_SIG = no; # r13y, generates a random key during build and bakes it in
789 # Depends on MODULE_SIG and only really helps when you sign your modules
790 # and enforce signatures which we don't do by default.
791 SECURITY_LOCKDOWN_LSM = no;
792
793 # provides a register of persistent per-UID keyrings, useful for encrypting storage pools in stratis
794 PERSISTENT_KEYRINGS = yes;
795 # enable temporary caching of the last request_key() result
796 KEYS_REQUEST_CACHE = yes;
797 # randomized slab caches
798 RANDOM_KMALLOC_CACHES = whenAtLeast "6.6" yes;
799
800 # NIST SP800-90A DRBG modes - enabled by most distributions
801 # and required by some out-of-tree modules (ShuffleCake)
802 # This does not include the NSA-backdoored Dual-EC mode from the same NIST publication.
803 CRYPTO_DRBG_HASH = yes;
804 CRYPTO_DRBG_CTR = yes;
805
806 # Enable KFENCE
807 # See: https://docs.kernel.org/dev-tools/kfence.html
808 KFENCE = whenAtLeast "5.12" yes;
809
810 # Enable support for page poisoning. Still needs to be enabled on the command line to actually work.
811 PAGE_POISONING = yes;
812 # Randomize page allocator when page_alloc.shuffle=1
813 SHUFFLE_PAGE_ALLOCATOR = yes;
814
815 INIT_ON_ALLOC_DEFAULT_ON = yes;
816
817 # Enable stack smashing protections in schedule()
818 # See: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v4.8&id=0d9e26329b0c9263d4d9e0422d80a0e73268c52f
819 SCHED_STACK_END_CHECK = yes;
820
821 # Enable separate slab buckets for user controlled allocations
822 # See: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=67f2df3b82d091ed095d0e47e1f3a9d3e18e4e41
823 SLAB_BUCKETS = whenAtLeast "6.11" yes;
824 }
825 // lib.optionalAttrs stdenv.hostPlatform.isx86_64 {
826 # Enable Intel SGX
827 X86_SGX = whenAtLeast "5.11" yes;
828 # Allow KVM guests to load SGX enclaves
829 X86_SGX_KVM = whenAtLeast "5.13" yes;
830
831 # AMD Cryptographic Coprocessor (CCP)
832 CRYPTO_DEV_CCP = yes;
833 # AMD SME
834 AMD_MEM_ENCRYPT = yes;
835 # AMD SEV and AMD SEV-SE
836 KVM_AMD_SEV = yes;
837 # AMD SEV-SNP
838 SEV_GUEST = whenAtLeast "5.19" module;
839 # Shadow stacks
840 X86_USER_SHADOW_STACK = whenAtLeast "6.6" yes;
841
842 # Enable support for Intel Trust Domain Extensions (TDX)
843 INTEL_TDX_GUEST = whenAtLeast "5.19" yes;
844 TDX_GUEST_DRIVER = whenAtLeast "6.2" module;
845
846 # Mitigate straight line speculation at the cost of some file size
847 SLS = whenBetween "5.17" "6.9" yes;
848 MITIGATION_SLS = whenAtLeast "6.9" yes;
849
850 DEFAULT_MMAP_MIN_ADDR = freeform "65536";
851 }
852 // lib.optionalAttrs stdenv.hostPlatform.isAarch64 {
853 DEFAULT_MMAP_MIN_ADDR = freeform "32768";
854 };
855
856 microcode = {
857 MICROCODE = lib.mkIf stdenv.hostPlatform.isx86 yes;
858 MICROCODE_INTEL = lib.mkIf stdenv.hostPlatform.isx86 (whenOlder "6.6" yes);
859 MICROCODE_AMD = lib.mkIf stdenv.hostPlatform.isx86 (whenOlder "6.6" yes);
860 # Write Back Throttling
861 # https://lwn.net/Articles/682582/
862 # https://bugzilla.kernel.org/show_bug.cgi?id=12309#c655
863 BLK_WBT = yes;
864 BLK_WBT_SQ = whenOlder "5.0" yes; # Removed in 5.0-RC1
865 BLK_WBT_MQ = yes;
866 };
867
868 container = {
869 NAMESPACES = yes; # Required by 'unshare' used by 'nixos-install'
870 RT_GROUP_SCHED = no;
871 CGROUP_DEVICE = yes;
872 CGROUP_HUGETLB = yes;
873 CGROUP_PERF = yes;
874 CGROUP_RDMA = yes;
875 CGROUP_DMEM = whenAtLeast "6.14" yes;
876
877 MEMCG = yes;
878 MEMCG_SWAP = whenOlder "6.1" yes;
879
880 BLK_DEV_THROTTLING = yes;
881 CFQ_GROUP_IOSCHED = whenOlder "5.0" yes; # Removed in 5.0-RC1
882 CGROUP_PIDS = yes;
883 };
884
885 staging = {
886 # Enable staging drivers. These are somewhat experimental, but
887 # they generally don't hurt.
888 STAGING = yes;
889 };
890
891 proc-events = {
892 # PROC_EVENTS requires that the netlink connector is not built
893 # as a module. This is required by libcgroup's cgrulesengd.
894 CONNECTOR = yes;
895 PROC_EVENTS = yes;
896 };
897
898 tracing = {
899 FTRACE = yes;
900 KPROBES = yes;
901 FUNCTION_TRACER = yes;
902 FTRACE_SYSCALLS = yes;
903 SCHED_TRACER = yes;
904 STACK_TRACER = yes;
905 UPROBE_EVENTS = option yes;
906 BPF_SYSCALL = yes;
907 BPF_UNPRIV_DEFAULT_OFF = whenBetween "5.10" "5.16" yes;
908 BPF_EVENTS = yes;
909 FUNCTION_PROFILER = yes;
910 RING_BUFFER_BENCHMARK = no;
911 };
912
913 perf = {
914 # enable AMD Zen branch sampling if available
915 PERF_EVENTS_AMD_BRS = whenAtLeast "5.19" (option yes);
916 };
917
918 virtualisation = {
919 PARAVIRT = option yes;
920
921 HYPERVISOR_GUEST = lib.mkIf stdenv.hostPlatform.isx86 yes;
922 PARAVIRT_SPINLOCKS = option yes;
923
924 KVM_ASYNC_PF = lib.mkIf (with stdenv.hostPlatform; isS390 || isx86) yes;
925 KVM_GENERIC_DIRTYLOG_READ_PROTECT = yes;
926 KVM_GUEST = lib.mkIf (with stdenv.hostPlatform; isPower || isx86) yes;
927 KVM_MMIO = yes;
928 KVM_VFIO = yes;
929 KSM = yes;
930 VIRT_DRIVERS = yes;
931 # We need 64 GB (PAE) support for Xen guest support
932 HIGHMEM64G = {
933 optional = true;
934 tristate = lib.mkIf (!stdenv.hostPlatform.is64bit) "y";
935 };
936
937 VFIO_PCI_VGA = lib.mkIf stdenv.hostPlatform.isx86_64 yes;
938
939 UDMABUF = yes;
940
941 # VirtualBox guest drivers in the kernel conflict with the ones in the
942 # official additions package and prevent the vboxsf module from loading,
943 # so disable them for now.
944 VBOXGUEST = option no;
945 DRM_VBOXVIDEO = option no;
946
947 XEN = option yes;
948 XEN_DOM0 = option yes;
949 PCI_XEN = option yes;
950 HVC_XEN = option yes;
951 HVC_XEN_FRONTEND = option yes;
952 XEN_SYS_HYPERVISOR = option yes;
953 SWIOTLB_XEN = option yes;
954 XEN_BACKEND = option yes;
955 XEN_BALLOON = option yes;
956 XEN_BALLOON_MEMORY_HOTPLUG = option yes;
957 XEN_EFI = option yes;
958 XEN_HAVE_PVMMU = option yes;
959 XEN_MCE_LOG = option yes;
960 XEN_PVH = option yes;
961 XEN_PVHVM = option yes;
962 XEN_SAVE_RESTORE = option yes;
963
964 # Enable device detection on virtio-mmio hypervisors
965 VIRTIO_MMIO_CMDLINE_DEVICES = yes;
966 };
967
968 media = {
969 MEDIA_DIGITAL_TV_SUPPORT = yes;
970 MEDIA_CAMERA_SUPPORT = yes;
971 MEDIA_CONTROLLER = yes;
972 MEDIA_PCI_SUPPORT = yes;
973 MEDIA_USB_SUPPORT = yes;
974 MEDIA_ANALOG_TV_SUPPORT = yes;
975 VIDEO_STK1160_COMMON = whenOlder "6.5" module;
976 };
977
978 "9p" = {
979 # Enable the 9P cache to speed up NixOS VM tests.
980 "9P_FSCACHE" = option yes;
981 "9P_FS_POSIX_ACL" = option yes;
982 };
983
984 huge-page = {
985 TRANSPARENT_HUGEPAGE = option yes;
986 TRANSPARENT_HUGEPAGE_ALWAYS = option no;
987 TRANSPARENT_HUGEPAGE_MADVISE = option yes;
988 };
989
990 zram = {
991 ZRAM = module;
992 ZRAM_WRITEBACK = option yes;
993 ZRAM_MULTI_COMP = whenAtLeast "6.2" yes;
994 ZRAM_BACKEND_842 = whenAtLeast "6.12" yes;
995 ZRAM_BACKEND_DEFLATE = whenAtLeast "6.12" yes;
996 ZRAM_BACKEND_LZ4 = whenAtLeast "6.12" yes;
997 ZRAM_BACKEND_LZ4HC = whenAtLeast "6.12" yes;
998 ZRAM_BACKEND_LZO = whenAtLeast "6.12" yes;
999 ZRAM_BACKEND_ZSTD = whenAtLeast "6.12" yes;
1000 ZRAM_DEF_COMP_ZSTD = whenAtLeast "5.11" yes;
1001 ZSWAP = option yes;
1002 ZSWAP_COMPRESSOR_DEFAULT_ZSTD = whenAtLeast "5.7" (lib.mkOptionDefault yes);
1003 ZPOOL = yes;
1004 ZSMALLOC = option yes;
1005 };
1006
1007 brcmfmac = {
1008 # Enable PCIe and USB for the brcmfmac driver
1009 BRCMFMAC_USB = option yes;
1010 BRCMFMAC_PCIE = option yes;
1011 };
1012
1013 # Support x2APIC (which requires IRQ remapping)
1014 x2apic = lib.optionalAttrs (stdenv.hostPlatform.system == "x86_64-linux") {
1015 X86_X2APIC = yes;
1016 IRQ_REMAP = yes;
1017 };
1018
1019 # Disable various self-test modules that have no use in a production system
1020 tests =
1021 {
1022 # This menu disables all/most of them on >= 4.16
1023 RUNTIME_TESTING_MENU = option no;
1024 }
1025 // {
1026 CRC32_SELFTEST = option no;
1027 CRYPTO_TEST = option no;
1028 EFI_TEST = option no;
1029 GLOB_SELFTEST = option no;
1030 LOCK_TORTURE_TEST = option no;
1031 MTD_TESTS = option no;
1032 NOTIFIER_ERROR_INJECTION = option no;
1033 RCU_PERF_TEST = whenOlder "5.9" no;
1034 RCU_SCALE_TEST = whenAtLeast "5.10" no;
1035 TEST_ASYNC_DRIVER_PROBE = option no;
1036 WW_MUTEX_SELFTEST = option no;
1037 XZ_DEC_TEST = option no;
1038 };
1039
1040 criu = {
1041 # Unconditionally enabled, because it is required for CRIU and
1042 # it provides the kcmp() system call that Mesa depends on.
1043 CHECKPOINT_RESTORE = yes;
1044
1045 # Allows soft-dirty tracking on pages, used by CRIU.
1046 # See https://docs.kernel.org/admin-guide/mm/soft-dirty.html
1047 MEM_SOFT_DIRTY = lib.mkIf (with stdenv.hostPlatform; isS390 || isPower64 || isx86_64) yes;
1048 };
1049
1050 misc =
1051 let
1052 # Use zstd for kernel compression if 64-bit and newer than 5.9, otherwise xz.
1053 # i686 issues: https://github.com/NixOS/nixpkgs/pull/117961#issuecomment-812106375
1054 useZstd = stdenv.buildPlatform.is64bit && lib.versionAtLeast version "5.9";
1055 in
1056 {
1057 # stdenv.hostPlatform.linux-kernel.target assumes uncompressed on RISC-V.
1058 KERNEL_UNCOMPRESSED = lib.mkIf stdenv.hostPlatform.isRiscV yes;
1059 KERNEL_XZ = lib.mkIf (!stdenv.hostPlatform.isRiscV && !useZstd) yes;
1060 KERNEL_ZSTD = lib.mkIf (
1061 with stdenv.hostPlatform;
1062 (isMips || isS390 || isx86 || (lib.versionAtLeast version "6.1" && isAarch64 || isLoongArch64))
1063 && useZstd
1064 ) yes;
1065
1066 HID_BATTERY_STRENGTH = yes;
1067 # enabled by default in x86_64 but not arm64, so we do that here
1068 HIDRAW = yes;
1069
1070 # Enable loading HID fixups as eBPF from userspace
1071 HID_BPF = whenAtLeast "6.3" (whenPlatformHasEBPFJit yes);
1072
1073 HID_ACRUX_FF = yes;
1074 DRAGONRISE_FF = yes;
1075 GREENASIA_FF = yes;
1076 HOLTEK_FF = yes;
1077 INPUT_JOYSTICK = yes;
1078 JOYSTICK_PSXPAD_SPI_FF = yes;
1079 LOGIG940_FF = yes;
1080 NINTENDO_FF = whenAtLeast "5.16" yes;
1081 NVIDIA_SHIELD_FF = whenAtLeast "6.5" yes;
1082 PLAYSTATION_FF = whenAtLeast "5.12" yes;
1083 SONY_FF = yes;
1084 SMARTJOYPLUS_FF = yes;
1085 THRUSTMASTER_FF = yes;
1086 ZEROPLUS_FF = yes;
1087
1088 MODULE_COMPRESS = lib.mkMerge [
1089 (whenOlder "5.13" yes)
1090 (whenAtLeast "6.12" yes)
1091 ];
1092 MODULE_COMPRESS_ALL = whenAtLeast "6.12" yes;
1093 MODULE_COMPRESS_XZ = yes;
1094
1095 SYSVIPC = yes; # System-V IPC
1096
1097 AIO = yes; # POSIX asynchronous I/O
1098
1099 UNIX = yes; # Unix domain sockets.
1100
1101 MD = yes; # Device mapper (RAID, LVM, etc.)
1102
1103 # enable support for device trees and overlays
1104 OF = option yes;
1105 OF_OVERLAY = option yes;
1106
1107 # Enable initrd support.
1108 BLK_DEV_INITRD = yes;
1109
1110 # Allows debugging systems that get stuck during suspend/resume
1111 PM_TRACE_RTC = lib.mkIf stdenv.hostPlatform.isx86 yes;
1112
1113 ACCESSIBILITY = yes; # Accessibility support
1114 AUXDISPLAY = yes; # Auxiliary Display support
1115 HIPPI = yes;
1116 MTD_COMPLEX_MAPPINGS = yes; # needed for many devices
1117
1118 SCSI_LOWLEVEL = yes; # enable lots of SCSI devices
1119 SCSI_LOWLEVEL_PCMCIA = yes;
1120 SCSI_SAS_ATA = yes; # added to enable detection of hard drive
1121
1122 SPI = yes; # needed for many devices
1123 SPI_MASTER = yes;
1124
1125 "8139TOO_8129" = yes;
1126 "8139TOO_PIO" = no; # PIO is slower
1127
1128 AIC79XX_DEBUG_ENABLE = no;
1129 AIC7XXX_DEBUG_ENABLE = no;
1130 AIC94XX_DEBUG = no;
1131
1132 BLK_DEV_INTEGRITY = yes;
1133 BLK_DEV_ZONED = yes;
1134
1135 BLK_SED_OPAL = yes;
1136
1137 # Enable support for block layer inline encryption
1138 BLK_INLINE_ENCRYPTION = whenAtLeast "5.8" yes;
1139 # ...but fall back to CPU encryption if unavailable
1140 BLK_INLINE_ENCRYPTION_FALLBACK = whenAtLeast "5.8" yes;
1141
1142 BSD_PROCESS_ACCT_V3 = yes;
1143
1144 SERIAL_DEV_BUS = yes; # enables support for serial devices
1145 SERIAL_DEV_CTRL_TTYPORT = yes; # enables support for TTY serial devices
1146
1147 BT_HCIBTUSB_MTK = yes; # MediaTek protocol support
1148
1149 BT_HCIUART = module; # required for BT devices with serial port interface (QCA6390)
1150 BT_HCIUART_BCM = option yes; # Broadcom Bluetooth support
1151 BT_HCIUART_BCSP = option yes; # CSR BlueCore support
1152 BT_HCIUART_H4 = option yes; # UART (H4) protocol support
1153 BT_HCIUART_LL = option yes; # Texas Instruments BRF
1154 BT_HCIUART_QCA = yes; # Qualcomm Atheros support
1155 BT_HCIUART_SERDEV = yes; # required by BT_HCIUART_QCA
1156
1157 BT_RFCOMM_TTY = option yes; # RFCOMM TTY support
1158 BT_QCA = module; # enables QCA6390 bluetooth
1159
1160 # Removed on 5.17 as it was unused
1161 # upstream: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0a4ee518185e902758191d968600399f3bc2be31
1162 CLEANCACHE = whenOlder "5.17" (option yes);
1163
1164 FSCACHE_STATS = yes;
1165
1166 DVB_DYNAMIC_MINORS = option yes; # we use udev
1167
1168 EFI_STUB = yes; # EFI bootloader in the bzImage itself
1169 EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER = whenOlder "6.2" (whenAtLeast "5.8" yes); # initrd kernel parameter for EFI
1170
1171 # Generic compression support for EFI payloads
1172 # Add new platforms only after they have been verified to build and boot.
1173 # This is unsupported on x86 due to a custom decompression mechanism.
1174 EFI_ZBOOT = lib.mkIf stdenv.hostPlatform.isAarch64 (whenAtLeast "6.1" yes);
1175
1176 CGROUPS = yes; # used by systemd
1177 FHANDLE = yes; # used by systemd
1178 SECCOMP = yes; # used by systemd >= 231
1179 SECCOMP_FILTER = yes; # ditto
1180 POSIX_MQUEUE = yes;
1181 FRONTSWAP = whenOlder "6.6" yes;
1182 FUSION = yes; # Fusion MPT device support
1183 IDE = lib.mkIf (with stdenv.hostPlatform; isAarch32 || isM68k || isMips || isPower || isx86) (
1184 whenOlder "5.14" no
1185 ); # deprecated IDE support, removed in 5.14
1186 IDLE_PAGE_TRACKING = yes;
1187
1188 JOYSTICK_XPAD_FF = option yes; # X-Box gamepad rumble support
1189 JOYSTICK_XPAD_LEDS = option yes; # LED Support for Xbox360 controller 'BigX' LED
1190
1191 KEYBOARD_APPLESPI = lib.mkIf stdenv.hostPlatform.isx86 module;
1192
1193 KEXEC_FILE = option yes;
1194 KEXEC_JUMP = option yes;
1195
1196 PARTITION_ADVANCED = yes; # Needed for LDM_PARTITION
1197 # Windows Logical Disk Manager (Dynamic Disk) support
1198 LDM_PARTITION = yes;
1199 LOGIRUMBLEPAD2_FF = yes; # Logitech Rumblepad 2 force feedback
1200 LOGO = no; # not needed
1201 MEDIA_ATTACH = yes;
1202 MEGARAID_NEWGEN = yes;
1203
1204 MLX5_CORE_EN = option yes;
1205
1206 NVME_MULTIPATH = yes;
1207
1208 NVME_AUTH = lib.mkMerge [
1209 (whenBetween "6.0" "6.7" yes)
1210 (whenAtLeast "6.7" module)
1211 ];
1212
1213 NVME_HOST_AUTH = whenAtLeast "6.7" yes;
1214 NVME_TCP_TLS = whenAtLeast "6.7" yes;
1215
1216 NVME_TARGET = module;
1217 NVME_TARGET_PASSTHRU = whenAtLeast "5.9" yes;
1218 NVME_TARGET_AUTH = whenAtLeast "6.0" yes;
1219 NVME_TARGET_TCP_TLS = whenAtLeast "6.7" yes;
1220
1221 PCI_P2PDMA = lib.mkIf (stdenv.hostPlatform.is64bit) yes;
1222
1223 PSI = yes;
1224
1225 MOUSE_ELAN_I2C_SMBUS = yes;
1226 MOUSE_PS2_ELANTECH = yes; # Elantech PS/2 protocol extension
1227 MOUSE_PS2_VMMOUSE = lib.mkIf stdenv.hostPlatform.isx86 yes;
1228 MTRR_SANITIZER = lib.mkIf stdenv.hostPlatform.isx86 yes;
1229 NET_FC = yes; # Fibre Channel driver support
1230 # Needed for touchpads to work on some AMD laptops
1231 PINCTRL_AMD = whenAtLeast "5.19" yes;
1232 # GPIO on Intel Bay Trail, for some Chromebook internal eMMC disks
1233 PINCTRL_BAYTRAIL = lib.mkIf stdenv.hostPlatform.isx86 yes;
1234 # GPIO for Braswell and Cherryview devices
1235 # Needs to be built-in to for integrated keyboards to function properly
1236 PINCTRL_CHERRYVIEW = lib.mkIf stdenv.hostPlatform.isx86 yes;
1237 # 8 is default. Modern gpt tables on eMMC may go far beyond 8.
1238 MMC_BLOCK_MINORS = freeform "32";
1239
1240 REGULATOR = yes; # Voltage and Current Regulator Support
1241 RC_DEVICES = option yes; # Enable IR devices
1242 RC_DECODERS = option yes; # Required for IR devices to work
1243
1244 RT2800USB_RT53XX = yes;
1245 RT2800USB_RT55XX = yes;
1246
1247 SCHED_AUTOGROUP = yes;
1248 CFS_BANDWIDTH = yes;
1249
1250 SCSI_LOGGING = yes; # SCSI logging facility
1251 SERIAL_8250 = yes; # 8250/16550 and compatible serial support
1252
1253 SLAB_FREELIST_HARDENED = yes;
1254 SLAB_FREELIST_RANDOM = yes;
1255
1256 SLIP_COMPRESSED = yes; # CSLIP compressed headers
1257 SLIP_SMART = yes;
1258
1259 HWMON = yes;
1260 THERMAL_HWMON = yes; # Hardware monitoring support
1261 NVME_HWMON = whenAtLeast "5.5" yes; # NVMe drives temperature reporting
1262 UEVENT_HELPER = no;
1263
1264 USERFAULTFD = yes;
1265 X86_CHECK_BIOS_CORRUPTION = lib.mkIf stdenv.hostPlatform.isx86 yes;
1266 X86_MCE = lib.mkIf stdenv.hostPlatform.isx86 yes;
1267
1268 RAS = yes; # Needed for EDAC support
1269
1270 # Our initrd init uses shebang scripts, so can't be modular.
1271 BINFMT_SCRIPT = yes;
1272 # For systemd-binfmt
1273 BINFMT_MISC = option yes;
1274
1275 # Required for EDID overriding
1276 FW_LOADER = yes;
1277 # Disable the firmware helper fallback, udev doesn't implement it any more
1278 FW_LOADER_USER_HELPER_FALLBACK = option no;
1279
1280 FW_LOADER_COMPRESS = yes;
1281 FW_LOADER_COMPRESS_ZSTD = whenAtLeast "5.19" yes;
1282
1283 HOTPLUG_PCI_ACPI = yes; # PCI hotplug using ACPI
1284 HOTPLUG_PCI_PCIE = yes; # PCI-Expresscard hotplug support
1285
1286 # Enable AMD's ROCm GPU compute stack
1287 HSA_AMD = lib.mkIf stdenv.hostPlatform.is64bit (yes);
1288 ZONE_DEVICE = lib.mkIf stdenv.hostPlatform.is64bit (yes);
1289 HMM_MIRROR = yes;
1290 DRM_AMDGPU_USERPTR = yes;
1291
1292 PREEMPT = no;
1293 PREEMPT_VOLUNTARY = yes;
1294
1295 X86_AMD_PLATFORM_DEVICE = lib.mkIf stdenv.hostPlatform.isx86 yes;
1296 X86_PLATFORM_DRIVERS_DELL = lib.mkIf stdenv.hostPlatform.isx86 (whenAtLeast "5.12" yes);
1297 X86_PLATFORM_DRIVERS_HP = lib.mkIf stdenv.hostPlatform.isx86 (whenAtLeast "6.1" yes);
1298
1299 LIRC = yes;
1300
1301 SCHED_CORE = whenAtLeast "5.14" yes;
1302 SCHED_CLASS_EXT = whenAtLeast "6.12" (whenPlatformHasEBPFJit yes);
1303
1304 LRU_GEN = whenAtLeast "6.1" yes;
1305 LRU_GEN_ENABLED = whenAtLeast "6.1" yes;
1306
1307 FSL_MC_UAPI_SUPPORT = lib.mkIf (stdenv.hostPlatform.system == "aarch64-linux") (
1308 whenAtLeast "5.12" yes
1309 );
1310
1311 ASHMEM = {
1312 optional = true;
1313 tristate = whenBetween "5.0" "5.18" "y";
1314 };
1315 ANDROID = {
1316 optional = true;
1317 tristate = whenBetween "5.0" "5.19" "y";
1318 };
1319 ANDROID_BINDER_IPC = {
1320 optional = true;
1321 tristate = whenAtLeast "5.0" "y";
1322 };
1323 ANDROID_BINDERFS = {
1324 optional = true;
1325 tristate = whenAtLeast "5.0" "y";
1326 };
1327 ANDROID_BINDER_DEVICES = {
1328 optional = true;
1329 freeform = whenAtLeast "5.0" "binder,hwbinder,vndbinder";
1330 };
1331
1332 TASKSTATS = yes;
1333 TASK_DELAY_ACCT = yes;
1334 TASK_XACCT = yes;
1335 TASK_IO_ACCOUNTING = yes;
1336
1337 # Fresh toolchains frequently break -Werror build for minor issues.
1338 WERROR = whenAtLeast "5.15" no;
1339
1340 # > CONFIG_KUNIT should not be enabled in a production environment. Enabling KUnit disables Kernel Address-Space Layout Randomization (KASLR), and tests may affect the state of the kernel in ways not suitable for production.
1341 # https://www.kernel.org/doc/html/latest/dev-tools/kunit/start.html
1342 KUNIT = whenAtLeast "5.5" no;
1343
1344 # Set system time from RTC on startup and resume
1345 RTC_HCTOSYS = option yes;
1346
1347 # Expose watchdog information in sysfs
1348 WATCHDOG_SYSFS = yes;
1349
1350 # Enable generic kernel watch queues
1351 # See https://docs.kernel.org/core-api/watch_queue.html
1352 WATCH_QUEUE = whenAtLeast "5.8" yes;
1353 }
1354 //
1355 lib.optionalAttrs
1356 (stdenv.hostPlatform.system == "x86_64-linux" || stdenv.hostPlatform.system == "aarch64-linux")
1357 {
1358 # Enable CPU/memory hotplug support
1359 # Allows you to dynamically add & remove CPUs/memory to a VM client running NixOS without requiring a reboot
1360 ACPI_HOTPLUG_CPU = yes;
1361 ACPI_HOTPLUG_MEMORY = yes;
1362 MEMORY_HOTPLUG = yes;
1363 MEMORY_HOTPLUG_DEFAULT_ONLINE = whenOlder "6.14" yes;
1364 MHP_DEFAULT_ONLINE_TYPE_ONLINE_AUTO = whenAtLeast "6.14" yes;
1365 MEMORY_HOTREMOVE = yes;
1366 HOTPLUG_CPU = yes;
1367 MIGRATION = yes;
1368 SPARSEMEM = yes;
1369
1370 # Bump the maximum number of CPUs to support systems like EC2 x1.*
1371 # instances and Xeon Phi.
1372 NR_CPUS = freeform "384";
1373
1374 # Enable LEDS to display link-state status of PHY devices (i.e. eth lan/wan interfaces)
1375 LED_TRIGGER_PHY = yes;
1376
1377 # Required for various hardware features on Chrome OS devices
1378 CHROME_PLATFORMS = yes;
1379 CHROMEOS_TBMC = module;
1380 CROS_EC = module;
1381 CROS_EC_I2C = module;
1382 CROS_EC_SPI = module;
1383 CROS_KBD_LED_BACKLIGHT = module;
1384 TCG_TIS_SPI_CR50 = whenAtLeast "5.5" yes;
1385 }
1386 //
1387 lib.optionalAttrs
1388 (stdenv.hostPlatform.system == "armv7l-linux" || stdenv.hostPlatform.system == "aarch64-linux")
1389 {
1390 # Enables support for the Allwinner Display Engine 2.0
1391 SUN8I_DE2_CCU = yes;
1392
1393 # See comments on https://github.com/NixOS/nixpkgs/commit/9b67ea9106102d882f53d62890468071900b9647
1394 CRYPTO_AEGIS128_SIMD = no;
1395
1396 # Distros should configure the default as a kernel option.
1397 # We previously defined it on the kernel command line as cma=
1398 # The kernel command line will override a platform-specific configuration from its device tree.
1399 # https://github.com/torvalds/linux/blob/856deb866d16e29bd65952e0289066f6078af773/kernel/dma/contiguous.c#L35-L44
1400 CMA_SIZE_MBYTES = freeform "32";
1401
1402 # Add debug interfaces for CMA
1403 CMA_DEBUGFS = yes;
1404 CMA_SYSFS = whenAtLeast "5.13" yes;
1405
1406 # https://docs.kernel.org/arch/arm/mem_alignment.html
1407 # tldr:
1408 # when buggy userspace code emits illegal misaligned LDM, STM,
1409 # LDRD and STRDs, the instructions trap, are caught, and then
1410 # are emulated by the kernel.
1411 #
1412 # This is the default on armv7l, anyway, but it is explicitly
1413 # enabled here for the sake of providing context for the
1414 # aarch64 compat option which follows.
1415 ALIGNMENT_TRAP = lib.mkIf (stdenv.hostPlatform.system == "armv7l-linux") yes;
1416
1417 # https://patchwork.kernel.org/project/linux-arm-kernel/patch/20220701135322.3025321-1-ardb@kernel.org/
1418 # tldr:
1419 # when encountering alignment faults under aarch64, this option
1420 # makes the kernel attempt to handle the fault by doing the
1421 # same style of misaligned emulation that is performed under
1422 # armv7l (see above option).
1423 #
1424 # This minimizes the potential for aarch32 userspace to behave
1425 # differently when run under aarch64 kernels compared to when
1426 # it is run under an aarch32 kernel.
1427 COMPAT_ALIGNMENT_FIXUPS = lib.mkIf (stdenv.hostPlatform.system == "aarch64-linux") (
1428 whenAtLeast "6.1" yes
1429 );
1430
1431 # requirement for CP15_BARRIER_EMULATION
1432 ARMV8_DEPRECATED = lib.mkIf (stdenv.hostPlatform.system == "aarch64-linux") yes;
1433 # emulate a specific armv7 instruction that was removed from armv8
1434 # this instruction is required to build a native armv7 nodejs on an
1435 # aarch64-linux builder, for example
1436 CP15_BARRIER_EMULATION = lib.mkIf (stdenv.hostPlatform.system == "aarch64-linux") yes;
1437 }
1438 // lib.optionalAttrs (stdenv.hostPlatform.system == "x86_64-linux") {
1439 CROS_EC_LPC = module;
1440 CROS_EC_ISHTP = module;
1441
1442 CHROMEOS_LAPTOP = module;
1443 CHROMEOS_PSTORE = module;
1444
1445 # Enable x86 resource control
1446 X86_CPU_RESCTRL = whenAtLeast "5.0" yes;
1447
1448 # Enable TSX on CPUs where it's not vulnerable
1449 X86_INTEL_TSX_MODE_AUTO = yes;
1450
1451 # Enable AMD Wi-Fi RF band mitigations
1452 # See https://cateee.net/lkddb/web-lkddb/AMD_WBRF.html
1453 AMD_WBRF = whenAtLeast "6.8" yes;
1454
1455 # Enable Intel Turbo Boost Max 3.0
1456 INTEL_TURBO_MAX_3 = yes;
1457 };
1458
1459 accel = {
1460 # Build DRM accelerator devices
1461 DRM_ACCEL = whenAtLeast "6.2" yes;
1462 };
1463 };
1464in
1465flattenKConf options