diff options
Diffstat (limited to 'gnu/build/linux-modules.scm')
| -rw-r--r-- | gnu/build/linux-modules.scm | 147 |
1 files changed, 146 insertions, 1 deletions
diff --git a/gnu/build/linux-modules.scm b/gnu/build/linux-modules.scm index c66ef97012..a149eff329 100644 --- a/gnu/build/linux-modules.scm +++ b/gnu/build/linux-modules.scm @@ -1,6 +1,7 @@ ;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2014, 2016, 2018, 2019 Ludovic Courtès <ludo@gnu.org> ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com> +;;; Copyright © 2018 Danny Milosavljevic <dannym@scratchpost.org> ;;; ;;; This file is part of GNU Guix. ;;; @@ -30,8 +31,10 @@ #:use-module (ice-9 vlist) #:use-module (ice-9 match) #:use-module (ice-9 rdelim) + #:autoload (ice-9 pretty-print) (pretty-print) #:export (dot-ko ensure-dot-ko + module-formal-name module-aliases module-dependencies module-soft-dependencies @@ -42,13 +45,18 @@ modules-loaded module-loaded? load-linux-module* + load-linux-modules-from-directory current-module-debugging-port device-module-aliases known-module-aliases matching-modules - missing-modules)) + missing-modules + + write-module-name-database + write-module-alias-database + write-module-device-database)) ;;; Commentary: ;;; @@ -95,6 +103,14 @@ key/value pairs.." (define %not-comma (char-set-complement (char-set #\,))) +(define (module-formal-name file) + "Return the module name of FILE as it appears in its info section. Usually +the module name is the same as the base name of FILE, modulo hyphens and minus +the \".ko\" extension." + (match (assq 'name (modinfo-section-contents file)) + (('name . name) name) + (#f #f))) + (define (module-dependencies file) "Return the list of modules that FILE depends on. The returned list contains module names, not actual file names." @@ -310,6 +326,18 @@ appears in BLACK-LIST are not loaded." (or (and recursive? (= EEXIST (system-error-errno args))) (apply throw args))))))) +(define (load-linux-modules-from-directory modules directory) + "Load MODULES and their dependencies from DIRECTORY, a directory containing +the '.ko' files. The '.ko' suffix is automatically added to MODULES if +needed." + (define module-name->file-name + (module-name-lookup directory)) + + (for-each (lambda (module) + (load-linux-module* (module-name->file-name module) + #:lookup-module module-name->file-name)) + modules)) + ;;; ;;; Device modules. @@ -486,4 +514,121 @@ are required to access DEVICE." (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 |