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+;;; SPDX-License-Identifier: GPL-3.0-or-later
+;;; Copyright © 2022, 2024 Hilton Chain <hako@ultrarare.space>
+
+(define-module (nongnu services nvidia)
+ #:use-module (guix gexp)
+ #:use-module (guix records)
+ #:use-module (gnu packages)
+ #:use-module (gnu packages linux)
+ #:use-module (gnu services)
+ #:use-module (gnu services base)
+ #:use-module (gnu services linux)
+ #:use-module (gnu services shepherd)
+ #:use-module (nongnu packages nvidia)
+ #:export (nvidia-configuration
+ nvidia-configuration?
+ nvidia-configuration-record?
+ nvidia-service-type))
+
+(define-record-type* <nvidia-configuration>
+ nvidia-configuration make-nvidia-configuration
+ nvidia-configuration?
+ (driver nvidia-configuration-driver
+ (default nvda)) ; file-like
+ (firmware nvidia-configuration-firmware
+ (default nvidia-firmware)) ; file-like
+ (module nvidia-configuration-module
+ (default nvidia-module))) ; file-like
+
+(define (nvidia-shepherd-service config)
+ (let ((nvidia-driver (nvidia-configuration-driver config))
+ (nvidia-smi (file-append nvidia-driver "/bin/nvidia-smi")))
+ (list (shepherd-service
+ (documentation "Prepare system environment for NVIDIA driver.")
+ (provision '(nvidia))
+ (requirement '(udev))
+ (one-shot? #t)
+ (modules '(((guix build utils) #:select (invoke/quiet))
+ ((rnrs io ports) #:select (get-line))))
+ (start
+ #~(lambda _
+ (when (file-exists? "/proc/driver/nvidia")
+ (let ((modprobe (call-with-input-file
+ "/proc/sys/kernel/modprobe" get-line)))
+ (false-if-exception
+ (begin
+ (invoke/quiet modprobe "--" "nvidia_uvm")
+ (invoke/quiet #$nvidia-smi)))))))))))
+
+(define nvidia-service-type
+ (service-type
+ (name 'nvidia)
+ (extensions
+ (list (service-extension shepherd-root-service-type
+ nvidia-shepherd-service)
+ (service-extension profile-service-type
+ (compose list nvidia-configuration-driver))
+ (service-extension udev-service-type
+ (compose list nvidia-configuration-driver))
+ (service-extension firmware-service-type
+ (compose list nvidia-configuration-firmware))
+ (service-extension linux-loadable-module-service-type
+ (compose list nvidia-configuration-module))))
+ (default-value (nvidia-configuration))
+ (description "Prepare system environment for NVIDIA driver.")))