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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2021 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package builtin
import (
"github.com/snapcore/snapd/interfaces"
"github.com/snapcore/snapd/interfaces/apparmor"
"github.com/snapcore/snapd/interfaces/udev"
)
const dspSummary = `allows controlling digital signal processors on certain boards`
const dspBaseDeclarationSlots = `
dsp:
allow-installation:
slot-snap-type:
- gadget
- core
deny-auto-connection: true
`
const ambarellaDspConnectedPlugApparmor = `
# Description: can manage and control the integrated digital signal processor on
# the ambarella device. This allows privileged access to hardware and kernel
# drivers related to the digital signal processor and thus is only allowed on
# specific devices providing the slot via a gadget and is also not auto-
# connected.
# The ucode device node corresponds to the firmware on the digital signal
# processor
/dev/ucode rw,
# The iav device node is the device node exposed for the specific IAV linux
# device driver used with the CV2x / S6Lm cores on an ambarella device
/dev/iav rw,
# The cavalry device node is used for managing the CV2x vector processor (VP).
/dev/cavalry rw,
# Ambarella kernel debug driver to allow user space setting the CV2x registers
/dev/ambad rw,
# another DSP device node
/dev/lens rw,
# various ambarella specific DSP control parameters
/proc/ambarella/iav r,
/proc/ambarella/ambnl/** rw,
/proc/ambarella/udc r,
/proc/ambarella/clock r,
/proc/ambarella/dsp_print rw,
/proc/ambarella/hdmi_edid r,
/proc/ambarella/cma r,
/proc/ambarella/ambarella_hwtimer rw,
/proc/ambarella/ambarella_hwtimer_outfreq rw,
/proc/ambarella/vapi_sync r,
/proc/ambarella/dsp_state r,
# to match vin0_idsp, vin1_idsp, vin2_idsp, etc.
/proc/ambarella/vin[0-9]_idsp r,
# to match e0021000.dma and e0020000.dma
/proc/ambarella/[0-9a-e][0-9a-e][0-9a-e][0-9a-e][0-9a-e][0-9a-e][0-9a-e][0-9a-e].dma rw,
# needed to control the usb device attached to the DSP
/proc/ambarella/usbphy0 rw,
`
var ambarellaDspConnectedPlugUDev = []string{
`KERNEL=="iav"`,
`KERNEL=="cavalry"`,
`KERNEL=="ucode"`,
`KERNEL=="lens"`,
`KERNEL=="ambad"`,
}
type dspInterface struct {
commonInterface
}
func (iface *dspInterface) AppArmorConnectedPlug(spec *apparmor.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
// check the flavor of the slot
var flavor string
_ = slot.Attr("flavor", &flavor)
switch flavor {
// only supported flavor for now
case "ambarella":
spec.AddSnippet(ambarellaDspConnectedPlugApparmor)
}
return nil
}
func (iface *dspInterface) UDevConnectedPlug(spec *udev.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
// check the flavor of the slot
var flavor string
_ = slot.Attr("flavor", &flavor)
switch flavor {
// only supported flavor for now
case "ambarella":
for _, rule := range ambarellaDspConnectedPlugUDev {
spec.TagDevice(rule)
}
}
return nil
}
func init() {
registerIface(&dspInterface{commonInterface{
name: "dsp",
summary: dspSummary,
baseDeclarationSlots: dspBaseDeclarationSlots,
}})
}
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