635 lines
23 KiB
Scheme
635 lines
23 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2016, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
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;;; Copyright © 2018 Danny Milosavljevic <dannym@scratchpost.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu build linux-modules)
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#:use-module (guix elf)
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#:use-module (guix glob)
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#:use-module (guix build syscalls)
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#:use-module ((guix build utils) #:select (find-files))
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#:use-module (rnrs io ports)
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#:use-module (rnrs bytevectors)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 vlist)
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#:use-module (ice-9 match)
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#:use-module (ice-9 rdelim)
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#:autoload (ice-9 pretty-print) (pretty-print)
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#:export (dot-ko
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ensure-dot-ko
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module-formal-name
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module-aliases
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module-dependencies
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module-soft-dependencies
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normalize-module-name
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file-name->module-name
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find-module-file
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recursive-module-dependencies
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modules-loaded
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module-loaded?
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load-linux-module*
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load-linux-modules-from-directory
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current-module-debugging-port
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device-module-aliases
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known-module-aliases
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matching-modules
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missing-modules
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write-module-name-database
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write-module-alias-database
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write-module-device-database))
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;;; Commentary:
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;;;
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;;; Tools to deal with Linux kernel modules.
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;;;
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;;; Code:
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(define current-module-debugging-port
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(make-parameter (%make-void-port "w")))
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(define (section-contents elf section)
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"Return the contents of SECTION in ELF as a bytevector."
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(let ((contents (make-bytevector (elf-section-size section))))
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(bytevector-copy! (elf-bytes elf) (elf-section-offset section)
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contents 0
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(elf-section-size section))
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contents))
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(define %not-nul
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(char-set-complement (char-set #\nul)))
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(define (nul-separated-string->list str)
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"Split STR at occurrences of the NUL character and return the resulting
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string list."
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(string-tokenize str %not-nul))
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(define (key=value->pair str)
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"Assuming STR has the form \"KEY=VALUE\", return a pair like (KEY
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. \"VALUE\")."
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(let ((= (string-index str #\=)))
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(cons (string->symbol (string-take str =))
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(string-drop str (+ 1 =)))))
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(define (modinfo-section-contents file)
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"Return the contents of the '.modinfo' section of FILE as a list of
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key/value pairs.."
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(let* ((bv (call-with-input-file file get-bytevector-all))
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(elf (parse-elf bv))
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(section (elf-section-by-name elf ".modinfo"))
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(modinfo (section-contents elf section)))
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(map key=value->pair
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(nul-separated-string->list (utf8->string modinfo)))))
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(define %not-comma
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(char-set-complement (char-set #\,)))
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(define (module-formal-name file)
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"Return the module name of FILE as it appears in its info section. Usually
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the module name is the same as the base name of FILE, modulo hyphens and minus
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the \".ko\" extension."
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(match (assq 'name (modinfo-section-contents file))
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(('name . name) name)
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(#f #f)))
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(define (module-dependencies file)
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"Return the list of modules that FILE depends on. The returned list
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contains module names, not actual file names."
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(let ((info (modinfo-section-contents file)))
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(match (assq 'depends info)
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(('depends . what)
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(string-tokenize what %not-comma)))))
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(define not-softdep-whitespace
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(char-set-complement (char-set #\space #\tab)))
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(define (module-soft-dependencies file)
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"Return the list of modules that can be preloaded, and then the list of
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modules that can be postloaded, of the soft dependencies of module FILE."
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;; TEXT: "pre: baz blubb foo post: bax bar"
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(define (parse-softdep text)
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(let loop ((value '())
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(tokens (string-tokenize text not-softdep-whitespace))
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(section #f))
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(match tokens
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((token rest ...)
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(if (string=? (string-take-right token 1) ":") ; section
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(loop value rest (string-trim-both (string-drop-right token 1)))
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(loop (cons (cons section token) value) rest section)))
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(()
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value))))
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;; Note: Multiple 'softdep sections are allowed.
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(let* ((info (modinfo-section-contents file))
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(entries (concatenate
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(filter-map (match-lambda
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(('softdep . value)
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(parse-softdep value))
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(_ #f))
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(modinfo-section-contents file)))))
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(let-values (((pres posts)
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(partition (match-lambda
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(("pre" . _) #t)
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(("post" . _) #f))
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entries)))
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(values (map (match-lambda
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((_ . value) value))
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pres)
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(map (match-lambda
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((_ . value) value))
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posts)))))
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(define (module-aliases file)
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"Return the list of aliases of module FILE."
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(let ((info (modinfo-section-contents file)))
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(filter-map (match-lambda
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(('alias . value)
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value)
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(_ #f))
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(modinfo-section-contents file))))
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(define dot-ko
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(cut string-append <> ".ko"))
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(define (ensure-dot-ko name)
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"Return NAME with a '.ko' prefix appended, unless it already has it."
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(if (string-suffix? ".ko" name)
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name
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(dot-ko name)))
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(define (normalize-module-name module)
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"Return the \"canonical\" name for MODULE, replacing hyphens with
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underscores."
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;; See 'modname_normalize' in libkmod.
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(string-map (lambda (chr)
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(case chr
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((#\-) #\_)
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(else chr)))
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module))
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(define (file-name->module-name file)
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"Return the module name corresponding to FILE, stripping the trailing '.ko'
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and normalizing it."
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(normalize-module-name (basename file ".ko")))
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(define (find-module-file directory module)
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"Lookup module NAME under DIRECTORY, and return its absolute file name.
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NAME can be a file name with or without '.ko', or it can be a module name.
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Raise an error if it could not be found.
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Module names can differ from file names in interesting ways; for instance,
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module names usually (always?) use underscores as the inter-word separator,
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whereas file names often, but not always, use hyphens. Examples:
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\"usb-storage.ko\", \"serpent_generic.ko\"."
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(define names
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;; List of possible file names. XXX: It would of course be cleaner to
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;; have a database that maps module names to file names and vice versa,
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;; but everyone seems to be doing hacks like this one. Oh well!
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(map ensure-dot-ko
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(delete-duplicates
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(list module
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(normalize-module-name module)
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(string-map (lambda (chr) ;converse of 'normalize-module-name'
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(case chr
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((#\_) #\-)
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(else chr)))
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module)))))
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(match (find-files directory
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(lambda (file stat)
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(member (basename file) names)))
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((file)
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file)
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(()
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(error "kernel module not found" module directory))
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((_ ...)
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(error "several modules by that name" module directory))))
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(define* (recursive-module-dependencies files
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#:key (lookup-module dot-ko))
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"Return the topologically-sorted list of file names of the modules depended
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on by FILES, recursively. File names of modules are determined by applying
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LOOKUP-MODULE to the module name."
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(let loop ((files files)
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(result '())
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(visited vlist-null))
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(match files
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(()
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(delete-duplicates (reverse result)))
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((head . tail)
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(let* ((visited? (vhash-assoc head visited))
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(deps (if visited?
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'()
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(map lookup-module (module-dependencies head))))
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(visited (if visited?
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visited
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(vhash-cons head #t visited))))
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(loop (append deps tail)
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(append result deps) visited))))))
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(define %not-newline
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(char-set-complement (char-set #\newline)))
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(define (modules-loaded)
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"Return the list of names of currently loaded Linux modules."
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(let* ((contents (call-with-input-file "/proc/modules"
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get-string-all))
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(lines (string-tokenize contents %not-newline)))
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(match (map string-tokenize lines)
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(((modules . _) ...)
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modules))))
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(define (module-black-list)
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"Return the black list of modules that must not be loaded. This black list
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is specified using 'modprobe.blacklist=MODULE1,MODULE2,...' on the kernel
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command line; it is honored by libkmod for users that pass
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'KMOD_PROBE_APPLY_BLACKLIST', which includes 'modprobe --use-blacklist' and
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udev."
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(define parameter
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"modprobe.blacklist=")
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(let ((command (call-with-input-file "/proc/cmdline"
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get-string-all)))
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(append-map (lambda (arg)
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(if (string-prefix? parameter arg)
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(string-tokenize (string-drop arg (string-length parameter))
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%not-comma)
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'()))
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(string-tokenize command))))
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(define (module-loaded? module)
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"Return #t if MODULE is already loaded. MODULE must be a Linux module name,
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not a file name."
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(member module (modules-loaded)))
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(define* (load-linux-module* file
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#:key
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(recursive? #t)
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(lookup-module dot-ko)
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(black-list (module-black-list)))
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"Load Linux module from FILE, the name of a '.ko' file; return true on
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success, false otherwise. When RECURSIVE? is true, load its dependencies
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first (à la 'modprobe'.) The actual files containing modules depended on are
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obtained by calling LOOKUP-MODULE with the module name. Modules whose name
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appears in BLACK-LIST are not loaded."
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(define (black-listed? module)
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(let ((result (member module black-list)))
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(when result
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(format (current-module-debugging-port)
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"not loading module '~a' because it's black-listed~%"
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module))
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result))
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(define (load-dependencies file)
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(let ((dependencies (module-dependencies file)))
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(every (cut load-linux-module* <>
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#:lookup-module lookup-module
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#:black-list black-list)
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(map lookup-module dependencies))))
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(and (not (black-listed? (file-name->module-name file)))
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(or (not recursive?)
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(load-dependencies file))
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(let ((fd #f))
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(format (current-module-debugging-port)
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"loading Linux module from '~a'...~%" file)
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(catch 'system-error
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(lambda ()
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(set! fd (open-fdes file O_RDONLY))
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(load-linux-module/fd fd)
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(close-fdes fd)
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#t)
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(lambda args
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;; If this module was already loaded and we're in modprobe style, ignore
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;; the error.
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(when fd (close-fdes fd))
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(or (and recursive? (= EEXIST (system-error-errno args)))
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(apply throw args)))))))
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(define (load-linux-modules-from-directory modules directory)
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"Load MODULES and their dependencies from DIRECTORY, a directory containing
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the '.ko' files. The '.ko' suffix is automatically added to MODULES if
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needed."
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(define module-name->file-name
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(module-name-lookup directory))
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(for-each (lambda (module)
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(load-linux-module* (module-name->file-name module)
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#:lookup-module module-name->file-name))
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modules))
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;;;
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;;; Device modules.
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;;;
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;; Copied from (guix utils). FIXME: Factorize.
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(define (readlink* file)
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"Call 'readlink' until the result is not a symlink."
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(define %max-symlink-depth 50)
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(let loop ((file file)
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(depth 0))
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(define (absolute target)
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(if (absolute-file-name? target)
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target
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(string-append (dirname file) "/" target)))
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(if (>= depth %max-symlink-depth)
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file
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(call-with-values
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(lambda ()
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(catch 'system-error
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(lambda ()
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(values #t (readlink file)))
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(lambda args
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(let ((errno (system-error-errno args)))
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(if (or (= errno EINVAL))
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(values #f file)
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(apply throw args))))))
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(lambda (success? target)
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(if success?
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(loop (absolute target) (+ depth 1))
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file))))))
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;; See 'major' and 'minor' in <sys/sysmacros.h>.
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(define (stat->device-major st)
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(ash (logand #xfff00 (stat:rdev st)) -8))
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(define (stat->device-minor st)
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(logand #xff (stat:rdev st)))
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(define %not-slash
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(char-set-complement (char-set #\/)))
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(define (read-uevent port)
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"Read a /sys 'uevent' file from PORT and return an alist where each car is a
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key such as 'MAJOR or 'DEVTYPE and each cdr is the corresponding value."
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(let loop ((result '()))
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(match (read-line port)
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((? eof-object?)
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(reverse result))
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(line
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(loop (cons (key=value->pair line) result))))))
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(define (device-module-aliases device)
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"Return the list of module aliases required by DEVICE, a /dev file name, as
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in this example:
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(device-module-aliases \"/dev/sda\")
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=> (\"scsi:t-0x00\" \"pci:v00008086d00009D03sv0000103Csd000080FAbc01sc06i01\")
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The modules corresponding to these aliases can then be found using
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'matching-modules'."
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;; The approach is adapted from
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;; <https://unix.stackexchange.com/questions/97676/how-to-find-the-driver-module-associated-with-a-device-on-linux>.
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(let* ((st (stat device))
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(type (stat:type st))
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(major (stat->device-major st))
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(minor (stat->device-minor st))
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(sys-name (string-append "/sys/dev/"
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(case type
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((block-special) "block")
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((char-special) "char")
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(else (symbol->string type)))
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"/" (number->string major) ":"
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(number->string minor)))
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(directory (canonicalize-path (readlink* sys-name))))
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(let loop ((components (string-tokenize directory %not-slash))
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(aliases '()))
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(match components
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(("sys" "devices" _)
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(reverse aliases))
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((head ... _)
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(let ((uevent (string-append (string-join components "/" 'prefix)
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"/uevent")))
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(if (file-exists? uevent)
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(let ((props (call-with-input-file uevent read-uevent)))
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(match (assq-ref props 'MODALIAS)
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(#f (loop head aliases))
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(alias (loop head (cons alias aliases)))))
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(loop head aliases))))))))
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(define (read-module-aliases port)
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"Read from PORT data in the Linux 'modules.alias' file format. Return a
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list of alias/module pairs where each alias is a glob pattern as like the
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result of:
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(string->compiled-sglob \"scsi:t-0x01*\")
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and each module is a module name like \"snd_hda_intel\"."
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(define (comment? str)
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(string-prefix? "#" str))
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(define (tokenize str)
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;; Lines have the form "alias ALIAS MODULE", where ALIAS can contain
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;; whitespace. This is why we don't use 'string-tokenize'.
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(let* ((str (string-trim-both str))
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(left (string-index str #\space))
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(right (string-rindex str #\space)))
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(list (string-take str left)
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(string-trim-both (substring str left right))
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(string-trim-both (string-drop str right)))))
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(let loop ((aliases '()))
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(match (read-line port)
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((? eof-object?)
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(reverse aliases))
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((? comment?)
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(loop aliases))
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(line
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(match (tokenize line)
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(("alias" alias module)
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(loop (alist-cons (string->compiled-sglob alias) module
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aliases)))
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(() ;empty line
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(loop aliases)))))))
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(define (current-kernel-directory)
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"Return the directory of the currently running Linux kernel."
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(string-append (or (getenv "LINUX_MODULE_DIRECTORY")
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"/run/booted-system/kernel/lib/modules")
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"/" (utsname:release (uname))))
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(define (current-alias-file)
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"Return the absolute file name of the default 'modules.alias' file."
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(string-append (current-kernel-directory) "/modules.alias"))
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(define* (known-module-aliases #:optional (alias-file (current-alias-file)))
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"Return the list of alias/module pairs read from ALIAS-FILE. Each alias is
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actually a pattern."
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(call-with-input-file alias-file read-module-aliases))
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(define* (matching-modules alias
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#:optional (known-aliases (known-module-aliases)))
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"Return the list of modules that match ALIAS according to KNOWN-ALIASES.
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ALIAS is a string like \"scsi:t-0x00\" as returned by
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'device-module-aliases'."
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(filter-map (match-lambda
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((pattern . module)
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(and (glob-match? pattern alias)
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module)))
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known-aliases))
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(define* (missing-modules device modules-provided)
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"Assuming MODULES-PROVIDED lists kernel modules that are already
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provided--e.g., in the initrd, return the list of missing kernel modules that
|
||
are required to access DEVICE."
|
||
(define aliases
|
||
;; Attempt to load 'modules.alias' from the current kernel, assuming we're
|
||
;; on Guix System, and assuming that corresponds to the kernel we'll be
|
||
;; installing.
|
||
(known-module-aliases))
|
||
|
||
(if aliases
|
||
(let* ((modules (delete-duplicates
|
||
(append-map (cut matching-modules <> aliases)
|
||
(device-module-aliases device))))
|
||
|
||
;; Module names (not file names) are supposed to use underscores
|
||
;; instead of hyphens. MODULES is a list of module names, whereas
|
||
;; LINUX-MODULES is file names without '.ko', so normalize them.
|
||
(provided (map file-name->module-name modules-provided)))
|
||
(remove (cut member <> provided) modules))
|
||
'()))
|
||
|
||
|
||
;;;
|
||
;;; Module databases.
|
||
;;;
|
||
|
||
(define (module-name->file-name/guess directory name)
|
||
"Guess the file name corresponding to NAME, a module name. That doesn't
|
||
always work because sometimes underscores in NAME map to hyphens (e.g.,
|
||
\"input-leds.ko\"), sometimes not (e.g., \"mac_hid.ko\")."
|
||
(string-append directory "/" (ensure-dot-ko name)))
|
||
|
||
(define (module-name-lookup directory)
|
||
"Return a one argument procedure that takes a module name (e.g.,
|
||
\"input_leds\") and returns its absolute file name (e.g.,
|
||
\"/.../input-leds.ko\")."
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(define mapping
|
||
(call-with-input-file (string-append directory "/modules.name")
|
||
read))
|
||
|
||
(lambda (name)
|
||
(or (assoc-ref mapping name)
|
||
(module-name->file-name/guess directory name))))
|
||
(lambda args
|
||
(if (= ENOENT (system-error-errno args))
|
||
(cut module-name->file-name/guess directory <>)
|
||
(apply throw args)))))
|
||
|
||
(define (write-module-name-database directory)
|
||
"Write a database that maps \"module names\" as they appear in the relevant
|
||
ELF section of '.ko' files, to actual file names. This format is
|
||
Guix-specific. It aims to deal with inconsistent naming, in particular
|
||
hyphens vs. underscores."
|
||
(define mapping
|
||
(map (lambda (file)
|
||
(match (module-formal-name file)
|
||
(#f (cons (basename file ".ko") file))
|
||
(name (cons name file))))
|
||
(find-files directory "\\.ko$")))
|
||
|
||
(call-with-output-file (string-append directory "/modules.name")
|
||
(lambda (port)
|
||
(display ";; Module name to file name mapping.
|
||
;;
|
||
;; This format is Guix-specific; it is not supported by upstream Linux tools.
|
||
\n"
|
||
port)
|
||
(pretty-print mapping port))))
|
||
|
||
(define (write-module-alias-database directory)
|
||
"Traverse the '.ko' files in DIRECTORY and create the corresponding
|
||
'modules.alias' file."
|
||
(define aliases
|
||
(map (lambda (file)
|
||
(cons (file-name->module-name file) (module-aliases file)))
|
||
(find-files directory "\\.ko$")))
|
||
|
||
(call-with-output-file (string-append directory "/modules.alias")
|
||
(lambda (port)
|
||
(display "# Aliases extracted from modules themselves.\n" port)
|
||
(for-each (match-lambda
|
||
((module . aliases)
|
||
(for-each (lambda (alias)
|
||
(format port "alias ~a ~a\n" alias module))
|
||
aliases)))
|
||
aliases))))
|
||
|
||
(define (aliases->device-tuple aliases)
|
||
"Traverse ALIASES, a list of module aliases, and search for
|
||
\"char-major-M-N\", \"block-major-M-N\", or \"devname:\" aliases. When they
|
||
are found, return a tuple (DEVNAME TYPE MAJOR MINOR), otherwise return #f."
|
||
(define (char/block-major? alias)
|
||
(or (string-prefix? "char-major-" alias)
|
||
(string-prefix? "block-major-" alias)))
|
||
|
||
(define (char/block-major->tuple alias)
|
||
(match (string-tokenize alias %not-dash)
|
||
((type "major" (= string->number major) (= string->number minor))
|
||
(list (match type
|
||
("char" "c")
|
||
("block" "b"))
|
||
major minor))))
|
||
|
||
(let* ((devname (any (lambda (alias)
|
||
(and (string-prefix? "devname:" alias)
|
||
(string-drop alias 8)))
|
||
aliases))
|
||
(major/minor (match (find char/block-major? aliases)
|
||
(#f #f)
|
||
(str (char/block-major->tuple str)))))
|
||
(and devname major/minor
|
||
(cons devname major/minor))))
|
||
|
||
(define %not-dash
|
||
(char-set-complement (char-set #\-)))
|
||
|
||
(define (write-module-device-database directory)
|
||
"Traverse the '.ko' files in DIRECTORY and create the corresponding
|
||
'modules.devname' file. This file contains information about modules that can
|
||
be loaded on-demand, such as file system modules."
|
||
(define aliases
|
||
(filter-map (lambda (file)
|
||
(match (aliases->device-tuple (module-aliases file))
|
||
(#f #f)
|
||
(tuple (cons (file-name->module-name file) tuple))))
|
||
(find-files directory "\\.ko$")))
|
||
|
||
(call-with-output-file (string-append directory "/modules.devname")
|
||
(lambda (port)
|
||
(display "# Device nodes to trigger on-demand module loading.\n" port)
|
||
(for-each (match-lambda
|
||
((module devname type major minor)
|
||
(format port "~a ~a ~a~a:~a~%"
|
||
module devname type major minor)))
|
||
aliases))))
|
||
|
||
;;; linux-modules.scm ends here
|