linsysfs(5): Remove sys/cdefs.h inclusion where it's not needed due to 685dc743

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

linsysfs(4): Reimplement listnics() using ifAPI

Handle if arrival/departure events and VNETs.

Differential Revision: https://reviews.freebsd.org/D38901
MFC after: 1 month
XMFC with: ifAPI, pseudofs

Revert "linsysfs(4): Reimplement listnics() using ifAPI"

This reverts commit 0b56641cfcda30d06243223f37781ccc18455bef.

As it poorly interacts with vnet subsystem

linsysfs(4): Keep Linux compatible sysfs the same as Ubuntu

By checking Ubuntu, there is no `/sys/subsystem' in sysfs. To compatible
with Ubuntu, delete the 'subsystem' creation in Linux compatible module.

On the other hand, the sysfs `/sys/subsystem' cause failure for some
Linux udev cases. In Linux udev source code, there is a function named
`scan_devices_all', and it will scan `/sys/subsystem' if it is existed,
but now there are nothing in /sys/subsystem `, and it returns empty
to cause some use cases failed.

Reviewed by: dchagin
Differential Revision: https://reviews.freebsd.org/D38885
MFC after: 1 month
XMFC with: ifAPI

linsysfs(4): Reimplement listnics() using ifAPI

Handle if arrival/departure events.

Reviewed by: melifaro (early version)
Differential Revision: https://reviews.freebsd.org/D38901
MFC after: 1 month
XMFC with: ifAPI

linsysfs(4): Refactor to avoid referencing an unstable interfaces

Enter the net epoch when traversing a list of interfaces. For that
split the ifname_linux_to_bsd() function on two counterparts, where
the ifname_linux_to_ifp() intended to use in epoch, while the
ifname_linux_to_bsd() intended to be a self-contained.
Until the linux_ioctl_coket() function is refactored, the
ifname_linux_to_bsd() temporarily returns interface outside
of the net epoch.

Reviewed by: melifaro
Differential Revision: https://reviews.freebsd.org/D38790

linux(4): Make linux_ifflags return a value

To simplify the use of the function in the printf-like statements.

Differential Revision: https://reviews.freebsd.org/D38830

linsysfs: Use IfAPI accessors

Replace the only two ifnet member accesses with IfAPI accessor calls.

Sponsored by: Juniper Networks, Inc.

linsysfs: plug set-but-not-used vars.

MFC after: 2 weeks

linsysfs: create /sys/bus/ and /sys/subsystem/

This looks like a no-op, but it prevents udevadm(8) with failing
loudly, which in turn unbreaks installation of libfprint-2-2, which
in Focal is a dependency for make-4.2.1-1.2.

One might wonder why installing a build utility involves messing
with device handling...

Sponsored By: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D29133

Add emulation support for the Linux kcov(4) ioctl API.

This makes it possible to run an unmodified Linux syzkaller executor
against the Linuxulator, and have it gather code coverage information.

Sponsored by: The FreeBSD Foundation

Make linprocfs(5) create /proc/bus/pci/devices/, and linsysfs(5)
create /sys/class/power_supply/. This silences some warnings
from biology/linux-foldingathome.

Reported by: 0mp
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D25557

Create a "drm" subdirectory for drm devices in linsysfs. Recent versions of
linux libdrm check for the existence of this directory:

https://cgit.freedesktop.org/mesa/drm/commit/?id=f8392583418aef5e27bfed9989aeb601e20cc96d

MFC after: 2 weeks

Remove wrong copyright line. Discussed with Carlos Neira.

Reported by: Rodney W. Grimes
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D13656

Adds sys/class/net devices to linsysfs.

Only two interfaces are created eth0 and lo and they expose
the following properties:
address, addr_len, flags, ifindex, mty, tx_queue_len and type.

Initial patch developed by Carlos Neira in 2017 and finished by me.

PR: 223722
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D13656

Remove unneeded includes.

MFC after: 2 week

Add sys/devices/system/cpu/{possible,present} to linsysfs(5).
That makes Linux lscpu(1) work.

Reviewed by: dchagin
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D20131

Create PCI_MATCH and pci_match_device

Create a covenience function to match PCI device IDs. It's about 15
years overdue.

Differential Revision: https://reviews.freebsd.org/D15999

linsysfs: depend on linux_common module on arm64, as on amd64

Sponsored by: Turing Robotic Industries

Make it easier for filesystems to count themselves as jail-enabled,
by doing most of the work in a new function prison_add_vfs in kern_jail.c
Now a jail-enabled filesystem need only mark itself with VFCF_JAIL, and
the rest is taken care of. This includes adding a jail parameter like
allow.mount.foofs, and a sysctl like security.jail.mount_foofs_allowed.
Both of these used to be a static list of known filesystems, with
predefined permission bits.

Reviewed by: kib
Differential Revision: D14681

sys/compat: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Add information needed by Linux libdrm 2.4.74 (shipped with CentOS 7.4).

Create a config file for PCI devices that exposes their configuration
space. Only fields needed by libdrm are filled in (vendor, device,
revision, subvendor and subdevice).

Link /sys/class/drm/card%d/device to the PCI device directory.

Set DEVNAME to dri/card%d. This works with both in-tree drm and drm-next
and is also the value used on Linux.

Tested by: Greg V <greg@unrelenting.technology>

linsysfs: quiet gcc -Wformat after r323692

Reviewed by: cem
Sponsored by: Dell EMC Isilon

linsysfs(5): Fix two unrelated issues

1. Swap the order of device_get_ivars with device_get_devclass and devclass
name validation. This bug was introduced in r323692.

2. Error check device_get_children and free the returned list. This bug was
introduced in the original linsysfs commit.

Reported by: Oleg V. Nauman <oleg AT theweb.org.ua>, hselasky (1); hselasky (2)
Reviewed by: hselasky
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D12407

linsysfs(5): Add support for recent libdrm

Expose more information about PCI devices (and GPUs in particular) via
linsysfs to libdrm.

This allows unmodified modern 64-bit Linux libdrm to work, which allows
modern Linux Mesa to work. The submitter reports that he tested the change
with an Ubuntu 16.04 chroot + amdgpu from graphics/drm-next-kmod.

PR: 222375
Submitted by: Greg V <greg AT unrelenting.technology>

Glibc get_nprocs() and get_nprocs_conf() uses the sysfs cpu infrastructure
to get number of processors. Implement /sys/devices/system/cpu/.

MFC after: 1 month

Add support to the jail framework to be able to mount linsysfs(5) and
linprocfs(5).

Differential Revision: D2846
Submitted by: Nikolai Lifanov <lifanov@mail.lifanov.com>
Reviewed by: jamie

Introduce a new module linux_common.ko which is intended for the
following primary purposes:

1. Remove the dependency of linsysfs and linprocfs modules from linux.ko,
which will be architecture specific on amd64.

2. Incorporate into linux_common.ko general code for platforms on which
we'll support two Linuxulator modules (for both instruction set - 32 & 64 bit).

3. Move malloc(9) declaration to linux_common.ko, to enable getting memory
usage statistics properly.

Currently linux_common.ko incorporates a code from linux_mib.c and linux_util.c
and linprocfs, linsysfs and linux kernel modules depend on linux_common.ko.

Temporarily remove dtrace garbage from linux_mib.c and linux_util.c

Differential Revision: https://reviews.freebsd.org/D1072
In collaboration with: Vassilis Laganakos.

Reviewed by: trasz

Provide includes that are needed in these files, and before were read
in implicitly via if.h -> if_var.h pollution.

Sponsored by: Netflix
Sponsored by: Nginx, Inc.

Add procfs to jail-mountable filesystems.

Reviewed by: jamie
MFC after: 1 week

Remove no-op assignment.

Submitted by: clang via arundel@
MFC after: 2 weeks

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

- Import the HEAD csup code which is the basis for the cvsmode work.

Add a pn_destroy field to pfs_node. This field points to a destructor
function which is called from pfs_destroy() before the node is reclaimed.

Modify pfs_create_{dir,file,link}() to accept a pointer to a destructor
function in addition to the usual attr / fill / vis pointers.

This breaks both the programming and binary interfaces between pseudofs
and its consumers. It is believed that there are no pseudofs consumers
outside the source tree, so that the impact of this change is minimal.

Submitted by: Aniruddha Bohra <bohra@cs.rutgers.edu>

MFP4 (110957)

Use TAILQ_FOREACH_SAFE instead of the unsafe one where an item is removed
from the queue.

This prevents a panic on kldunload.

Submitted by: rdivacky
Tested by: bsam

Remove the dependency on procfs since it isn't used.

Noticed by: des

Add in linsysfs. A linux 2.6 like sys filesystem to pacify the Linux
LSI MegaRAID SAS utility.

Sponsored by: IronPort Systems
Man page help from: brueffer