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linux-modules: Add support for listing PCI devices.

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* gnu/build/linux-modules.scm (<pci-device>): New record type.
(pci-device-class-predicate, storage-pci-device?, network-pci-device?)
(display-pci-device?, pci-devices?): New procedures.
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Ludovic Courtès 2022-11-03 14:36:21 +01:00
parent 4f7ffb97a4
commit 655fb8feac
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1 changed files with 60 additions and 1 deletions
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61
gnu/build/linux-modules.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2016, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014, 2016, 2018, 2019, 2022 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2018 Danny Milosavljevic <dannym@scratchpost.org>
;;;
@ -28,6 +28,7 @@
#:use-module (rnrs io ports)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9 gnu)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (ice-9 ftw)
@ -50,6 +51,16 @@
load-linux-module*
load-linux-modules-from-directory
pci-devices
pci-device?
pci-device-vendor
pci-device-id
pci-device-class
pci-device-module-alias
storage-pci-device?
network-pci-device?
display-pci-device?
current-module-debugging-port
device-module-aliases
@ -429,6 +440,54 @@ key such as 'MAJOR or 'DEVTYPE and each cdr is the corresponding value."
(line
(loop (cons (key=value->pair line) result))))))
;; PCI device known to the Linux kernel.
(define-immutable-record-type <pci-device>
(pci-device vendor device class module-alias)
pci-device?
(vendor pci-device-vendor) ;integer
(device pci-device-id) ;integer
(class pci-device-class) ;integer
(module-alias pci-device-module-alias)) ;string | #f
(define (pci-device-class-predicate mask bits)
(lambda (device)
"Return true if DEVICE has the chosen class."
(= (logand mask (pci-device-class device)) bits)))
(define storage-pci-device? ;"Mass storage controller" class
(pci-device-class-predicate #xff0000 #x010000))
(define network-pci-device? ;"Network controller" class
(pci-device-class-predicate #xff0000 #x020000))
(define display-pci-device? ;"Display controller" class
(pci-device-class-predicate #xff0000 #x030000))
(define (pci-devices)
"Return the list of PCI devices of the system (<pci-device> records)."
(define (read-hex port)
(let ((line (read-line port)))
(and (string? line)
(string-prefix? "0x" line)
(string->number (string-drop line 2) 16))))
(filter-map (lambda (directory)
(define properties
(call-with-input-file (string-append directory "/uevent")
read-uevent))
(define vendor
(call-with-input-file (string-append directory "/vendor")
read-hex))
(define device
(call-with-input-file (string-append directory "/device")
read-hex))
(define class
(call-with-input-file (string-append directory "/class")
read-hex))
(pci-device vendor device class
(assq-ref properties 'MODALIAS)))
(find-files "/sys/bus/pci/devices"
#:stat lstat)))
(define (device-module-aliases device)
"Return the list of module aliases required by DEVICE, a /dev file name, as
in this example: