diff options
| -rw-r--r-- | doc/guix.texi | 37 | ||||
| -rw-r--r-- | gnu/services/linux.scm | 57 | ||||
| -rw-r--r-- | gnu/tests/linux-modules.scm | 45 |
3 files changed, 125 insertions, 14 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index 8cb85fe62c..bc5602474e 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -76,6 +76,7 @@ Copyright @copyright{} 2020 Damien Cassou@* Copyright @copyright{} 2020 Jakub Kądziołka@* Copyright @copyright{} 2020 Jack Hill@* Copyright @copyright{} 2020 Naga Malleswari@* +Copyright @copyright{} 2020 Brice Waegeneire@* Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or @@ -25383,6 +25384,42 @@ notifications. @end table @end deftp +@cindex modprobe +@cindex kernel module loader +@subsubsection Kernel Module Loader Service + +The kernel module loader service allows one to load loadable kernel +modules at boot. This is especially useful for modules that don't +autoload and need to be manually loaded, as it's the case with +@code{ddcci}. + +@deffn {Scheme Variable} kernel-module-loader-service-type +The service type for loading loadable kernel modules at boot with +@command{modprobe}. Its value must be a list of strings representing +module names. For example loading the drivers provided by +@code{ddcci-driver-linux}, in debugging mode by passing some module +parameters, can be done as follow: + +@lisp +(use-modules (gnu) (gnu services)) +(use-package-modules linux) +(use-service-modules linux) + +(define ddcci-config + (plain-file "ddcci.conf" + "options ddcci dyndbg delay=120")) + +(operating-system + ... + (services (cons* (service kernel-module-loader-service-type + '("ddcci" "ddcci_backlight")) + (simple-service 'ddcci-config etc-service-type + (list `("modprobe.d/ddcci.conf" + ,ddcci-config))) + %base-services)) + (kernel-loadable-modules (list ddcci-driver-linux))) +@end lisp +@end deffn @node Miscellaneous Services @subsection Miscellaneous Services diff --git a/gnu/services/linux.scm b/gnu/services/linux.scm index caa0326c31..781a61973c 100644 --- a/gnu/services/linux.scm +++ b/gnu/services/linux.scm @@ -1,5 +1,6 @@ ;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com> +;;; Copyright © 2020 Brice Waegeneire <brice@waegenei.re> ;;; ;;; This file is part of GNU Guix. ;;; @@ -25,6 +26,8 @@ #:use-module (gnu packages linux) #:use-module (srfi srfi-1) #:use-module (srfi srfi-26) + #:use-module (srfi srfi-34) + #:use-module (srfi srfi-35) #:use-module (ice-9 match) #:export (earlyoom-configuration earlyoom-configuration? @@ -37,7 +40,9 @@ earlyoom-configuration-ignore-positive-oom-score-adj? earlyoom-configuration-show-debug-messages? earlyoom-configuration-send-notification-command - earlyoom-service-type)) + earlyoom-service-type + + kernel-module-loader-service-type)) ;;; @@ -123,3 +128,53 @@ representation." (list (service-extension shepherd-root-service-type (compose list earlyoom-shepherd-service)))) (description "Run @command{earlyoom}, the Early OOM daemon."))) + + +;;; +;;; Kernel module loader. +;;; + +(define kernel-module-loader-shepherd-service + (match-lambda + ((and (? list? kernel-modules) ((? string?) ...)) + (list + (shepherd-service + (documentation "Load kernel modules.") + (provision '(kernel-module-loader)) + (requirement '(file-systems)) + (respawn? #f) + (one-shot? #t) + (modules `((srfi srfi-1) + (srfi srfi-34) + (srfi srfi-35) + (rnrs io ports) + ,@%default-modules)) + (start + #~(lambda _ + (cond + ((null? '#$kernel-modules) #t) + ((file-exists? "/proc/sys/kernel/modprobe") + (let ((modprobe (call-with-input-file + "/proc/sys/kernel/modprobe" get-line))) + (guard (c ((message-condition? c) + (format (current-error-port) "~a~%" + (condition-message c)) + #f)) + (every (lambda (module) + (invoke/quiet modprobe "--" module)) + '#$kernel-modules)))) + (else + (format (current-error-port) "error: ~a~%" + "Kernel is missing loadable module support.") + #f))))))))) + +(define kernel-module-loader-service-type + (service-type + (name 'kernel-module-loader) + (description "Load kernel modules.") + (extensions + (list (service-extension shepherd-root-service-type + kernel-module-loader-shepherd-service))) + (compose concatenate) + (extend append) + (default-value '()))) diff --git a/gnu/tests/linux-modules.scm b/gnu/tests/linux-modules.scm index 39e11587c6..788bdc848a 100644 --- a/gnu/tests/linux-modules.scm +++ b/gnu/tests/linux-modules.scm @@ -1,6 +1,7 @@ ;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2019 Jakob L. Kreuze <zerodaysfordays@sdf.org> ;;; Copyright © 2020 Danny Milosavljevic <dannym@scratchpost.org> +;;; Copyright © 2020 Brice Waegeneire <brice@waegenei.re> ;;; ;;; This file is part of GNU Guix. ;;; @@ -19,6 +20,8 @@ (define-module (gnu tests linux-modules) #:use-module (gnu packages linux) + #:use-module (gnu services) + #:use-module (gnu services linux) #:use-module (gnu system) #:use-module (gnu system vm) #:use-module (gnu tests) @@ -37,25 +40,40 @@ ;;; ;;; Code: -(define* (module-loader-program os modules) - "Return an executable store item that, upon being evaluated, will dry-run -load MODULES." +(define* (modules-loaded?-program os modules) + "Return an executable store item that, upon being evaluated, will verify +that MODULES are actually loaded." (program-file - "load-kernel-modules.scm" - (with-imported-modules (source-module-closure '((guix build utils))) - #~(begin - (use-modules (guix build utils)) - (for-each (lambda (module) - (invoke (string-append #$kmod "/bin/modprobe") "-n" "--" - module)) - '#$modules))))) + "verify-kernel-modules-loaded.scm" + #~(begin + (use-modules (ice-9 rdelim) + (ice-9 popen) + (srfi srfi-1) + (srfi srfi-13)) + (let* ((port (open-input-pipe (string-append #$kmod "/bin/lsmod"))) + (lines (string-split (read-string port) #\newline)) + (separators (char-set #\space #\tab)) + (modules (map (lambda (line) + (string-take line + (or (string-index line separators) + 0))) + lines)) + (status (close-pipe port))) + (and (= status 0) + (and-map (lambda (module) + (member module modules string=?)) + '#$modules)))))) (define* (run-loadable-kernel-modules-test module-packages module-names) - "Run a test of an OS having MODULE-PACKAGES, and modprobe MODULE-NAMES." + "Run a test of an OS having MODULE-PACKAGES, and verify that MODULE-NAMES +are loaded in memory." (define os (marionette-operating-system (operating-system (inherit (simple-operating-system)) + (services (cons (service kernel-module-loader-service-type module-names) + (operating-system-user-services + (simple-operating-system)))) (kernel-loadable-modules module-packages)) #:imported-modules '((guix combinators)))) (define vm (virtual-machine os)) @@ -75,7 +93,8 @@ load MODULES." marionette)) (test-end) (exit (= (test-runner-fail-count (test-runner-current)) 0))))) - (gexp->derivation "loadable-kernel-modules" (test (module-loader-program os module-names)))) + (gexp->derivation "loadable-kernel-modules" + (test (modules-loaded?-program os module-names)))) (define %test-loadable-kernel-modules-0 (system-test |