summaryrefslogtreecommitdiffstats
path: root/tools/display_driver_helper
blob: 02dd482e3a0d759c6f27e28d1f4d69438964d51f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
#!/bin/sh
#
# Display driver helper
#
# Copyright (c) 2010, 2011 Anssi Hannula <anssi.hannula@iki.fi>
#
# - Load drivers for specified modaliases, skipping disabled display drivers
#   that would cause conflicts (KMS vs. vesa, KMS vs. proprietary).
# - Get information about enabled driver modules
# - Check that the loaded modules are correct
#
# Licensed under terms of GPLv2 or later.
#
# When updating, check:
# - the variables below
# - check_driver function
# - check_dkms_status function
#

if [ -n "$DEBUG_DISPLAY_DRIVER_HELPER" ]; then
	echo "$(date) $*" >> /dev/ddh_debug
	exec 2>>/dev/ddh_debug
	set -x
fi

export LC_ALL=C

KMS_DRIVERS="i915 radeon nouveau"
# module names at run-time (hence nvidia instead of nvidia*):
KNOWN_MODULES="i915|radeon|nouveau|fglrx|nvidia"

XORG_i915="intel"
CONFLICTS_i915=""

XORG_nouveau="nouveau"
CONFLICTS_nouveau="nv nvidia"

XORG_radeon="ati radeon"
CONFLICTS_radeon="fglrx"

# Note: no /usr
# See end of script for descriptions of global variables.
check_driver() {
	local name="$1"
	case "$name" in
	i915)
		# implicitely loaded by X.org
		check_xorg $name 0 || return 1
		IS_KMS=1
		;;
	radeon)
		# implicitely loaded by X.org
		check_xorg $name 0 || return 1
		IS_KMS=1
		# radeon needs to loaded before X server
		NEEDS_LOAD_NOW=1
		;;
	nouveau)
		# these KMS drivers require an explicit directive in xorg.conf
		check_xorg $name 1 || return 1
		IS_KMS=1
		;;
	fglrx)
		check_xorg fglrx 1 || return 1
		check_dkms fglrx || return 1
		;;
	nvidia)
		# manually installed driver or a call from check_loaded()
		UNSURE=1
		check_xorg nvidia 1 || return 1
		;;
	nvidiafb)
		# this is only reached if nvidiafb is manually unblacklisted
		return 2
		;;
	nvidia*)
		[ "$name" = "nvidia_current" ] && name=nvidia-current
		# there are multiple co-installable driver versions, so check
		# the active alternative as well
		check_gl /etc/$name/ld.so.conf || return 1
		check_xorg nvidia 1 || return 1
		check_dkms $name || return 1
		;;
	*)
		# unknown, will be loaded only if no known drivers were found
		return 2
		;;
	esac
	return 0
}

# Return success if there is no new pending DKMS build (needed to disallow
# speedboot on very early boot).
# Previously failed build or a missing module is counted as no pending build.
# Note: no /usr
check_dkms_status() {
	[ -e /etc/alternatives/gl_conf ] || return 0
	# return fast for non-DKMS
	check_gl /etc/ld.so.conf.d/GL/standard.conf && return 0

	local active="$(ls -l /etc/alternatives/gl_conf | awk '{ print $NF }')"

	local modname=

	case $active in
	/etc/nvidia*/ld.so.conf)
		modname="nvidia${active#*nvidia}"
		modname="${modname%/*}"
		;;
	/etc/ld.so.conf.d/GL/ati.conf)
		modname="fglrx"
		;;
	*)
		# Unknown DKMS-looking driver,
		# allow speedboot.
		return 0
		;;
	esac
	check_dkms "$modname" 1
}

# Check if all loaded kernel modules have correct xorg.conf
check_loaded() {
	for module in $(grep -oE "^($KNOWN_MODULES) " /proc/modules); do
		check_driver "$module" || return 1
	done
	return 0
}

# Check that specified DKMS driver is not queued for build for the current
# kernel. Used to check if we 1) should disable speedboot for this boot
# (--check-dkms-status), and 2) if should should load the currently
# existing driver (--load). Doing otherwise might cause us to load a wrong old
# version of the driver that had been installed using e.g. binary DKMS
# packages.
# Note: no /usr
check_dkms() {
	local driver="$1"
	local force="$2"

	# If called from DKMS itself or we are not in rc.sysinit anymore,
	# there are no pending builds.
	if [ -z "$force" ]; then
		[ "$DKMS_AUTOLOAD_MODULE" = "$driver" ] && return 0
		[ -z "$STARTUP" ] && [ ! -f "/dev/.in_sysinit" ] && return 0
	fi

	local found=
	local uname_r="$(uname -r)"

	for dir in /var/lib/dkms/$driver/*; do
		[ -e "$dir" ] || return 0 # no module, no build; or no /var
		[ -L "$dir" ] && continue # not a module version
		found=1 # module version found
		[ -e "$dir/$uname_r" ] && return 0
		[ -e "/var/lib/dkms-binary/$driver/$(basename "$dir")/$uname_r" ] && return 0

		if [ -e "$dir/build/make.log" ]; then
			# Build has failed for some kernel, check if it is this one.
			# If so, there is no point in returning 1.
			grep -q "^DKMS make\.log.* $uname_r " && return 0
		fi
	done

	# if module versions were found but none were built for this kernel, return 1
	[ -n "$found" ] && return 1 || return 0
}

# Note: no /usr
check_gl() {
	local alt_inode="$(stat -L -c%i $1 2>/dev/null)"
	[ -n "$alt_inode" ] || return 1
	[ -n "$GL_INODE" ] || GL_INODE="$(stat -L -c%i /etc/alternatives/gl_conf 2>/dev/null)"
	[ "$alt_inode" = "$GL_INODE" ] || return 1
	return 0
}

# Note: no /usr
get_xorg_drivers() {
	if [ -z "$XORG_DRIVERS" ]; then
		XORG_DRIVERS="$(cat /etc/X11/xorg.conf /etc/X11/xorg.conf.d/*.conf 2>/dev/null |
			awk -F'"' -vORS=' ' -vIGNORECASE=1 '
			/^[[:space:]]+*section[[:space:]]+"device"/	{ device=1 }
			/endsection/					{ device=0 }
			/^[[:space:]]*driver[[:space:]]*".*"/		{ if (device) drivers[$2]=$2 }
			END						{ for (driver in drivers) print driver }
			')"
		[ -n "$XORG_DRIVERS" ] || XORG_DRIVERS="-"
	fi
}

# Note: no /usr
# parameter 1: xorg driver
# parameter 2: 1 the check if the driver is explicitely enabled
#              0 means that check only for conflicts
check_xorg() {
	local driver="$1"
	local explicit_only="$2"

	eval local xorg_drivers=\"\$XORG_$driver\"
	[ -n "$xorg_drivers" ] || xorg_drivers="$driver"
	eval local conflicts=\"\$CONFLICTS_$driver\"

	get_xorg_drivers

	conflict_found=
	for enabled_driver in $XORG_DRIVERS; do
		for xorg_driver in $xorg_drivers; do
			[ "$enabled_driver" = "$xorg_driver" ] && return 0
		done

		# if the X.org driver can be loaded implicitely, check that
		# there are no conflicting drivers that override the driver
		if [ "$explicit_only" = "0" -a -z "$conflict_found" ]; then
			for conflict in vesa $conflicts; do
				if [ "$enabled_driver" = "$conflict" ]; then
				       conflict_found=1
				       continue 2
				       # continue loop to check for an explicit load
				fi
			done
		fi
	done

	# in case of a conflict, do not load the module
	[ -n "$conflict_found" ] && return 1

	# no driver is selected - don't load if explicit_only is 1
	[ "$explicit_only" = "1" ] && return 1

	# implicit load allowed; still don't load if no xorg.conf (i.e. live cd)
	[ -e "/etc/X11/xorg.conf" ]
}

# Load the driver for the specified modalias, if configured.
# Note: no /usr
load_driver() {
	local modulename
	local load_default=1

	# NOTE: UPDATE when module-init-tools is upgraded to get better performance
	# modprobe has -R option:
	#for modulename in $(/home/anssi/module-init-tools-3.12/build/modprobe -Rq "$1"); do
	# modprobe does not have -R option:
	for mod in $(/sbin/modprobe -biqvn "$1"); do
		[ "$mod" = "insmod" ] && continue
		modulename="${mod##*/}"
		modulename="${modulename%%.*}"

		check_driver "$modulename"
		case $? in
		1)	# a driver which needs handling by this script matches
			# the modalias, but was not configured - do not run
			# the generic modprobe if no other drivers are
			# configured either
			load_default=
			continue
			;;
		2)	continue
			;;
		esac

		if [ -n "$IS_KMS" ]; then
			grep -q "^$modulename " /proc/modules && return 0
			echo "$modulename" > /dev/.late_kms 2>/dev/null
			# If NEEDS_LOAD_NOW is not set and plymouth is running,
			# skip loading the driver to avoid quitting plymouth.
			# The driver will be loaded later by X server itself.
			[ -z "$NEEDS_LOAD_NOW" ] && /bin/plymouth --ping 2>/dev/null && return 0
			/bin/plymouth quit 2>/dev/null
		fi
		/sbin/modprobe -b "$modulename" && return 0
	done

	# no specially handled modules were loaded, so load all modules normally
	# unless $load_default was set above
	[ -z "$load_default" ] || /sbin/modprobe -b "$1"
}

is_kms_allowed() {
	for driver in $KMS_DRIVERS; do
		# Check all drivers for conflicts only.
		check_xorg $driver 0 || return 1
	done
	return 0
}

get_initrd_kms_drivers() {
	local initrd="$1"

	local kms_drivers="$(echo "$KMS_DRIVERS" | tr " " "|")"
	zcat "$initrd" | cpio -t --quiet | sed -nr "s,.*/($kms_drivers)\.ko.*$,\1,p"
}

# Check that the initrd doesn't contain disabled modules
check_initrd() {
	local initrd="$1"
	local initrd_drivers="$(get_initrd_kms_drivers "$initrd")"
	for driver in $initrd_drivers; do
		check_driver "$driver" || return 1
	done
	for driver2 in $(get_active_kms_drivers); do
		for driver in $initrd_drivers; do
			[ "$driver" = "$driver2" ] && continue 2
		done
		# An enabled module for present hardware was not in initrd
		return 1
	done
	return 0
}

get_active_kms_drivers() {
	local kms_drivers=
	for device in $(grep -l 0x03 /sys/bus/pci/devices/0000\:0*/class); do
		[ -e "$device" ] || continue
		device="$(dirname $device)"
		[ -f "$device/modalias" ] || continue
		modalias="$(cat "$device/modalias")"
		for mod in $(/sbin/modprobe --first-time -biqvn "$modalias" 2>&1); do
			modulename="${mod##*/}"
			modulename="${modulename%%.*}"
			IS_KMS=
			check_driver "$modulename" || continue
			[ -n "$IS_KMS" ] && echo $modulename
		done
	done
}

usage() {
	cat <<EOF
Usage: $0 action [arguments]

Known actions:

  --load MODALIAS
        Load drivers matching MODALIAS, checking that they are enabled and
        configured.

  --load-dkms-autoload MODNAME MODALIAS
        Same as --load, but assume MODNAME is built and correct so that
        checking dkms status is unnecessary.

  --is-disabled MODNAME
        Checks whether the driver corresponding to MODNAME is disabled (e.g.
        a conflicting driver is configured, etc.). Unknown MODNAMEs are
        considered not disabled.

  --is-enabled-kms MODNAME
        Checks whether the driver corresponding to MODNAME is enabled and
        MODNAME is a known KMS module. Note that drivers may be enabled even
        if there is no such hardware. This just checks that there are
        no conflicting drivers in use etc.

  --is-kms-allowed
        Checks whether it is ok to load KMS drivers in initrd. This returns
        a failure when a conflicting driver is set up (vesa or a proprietary
        one).

  --get-all-kms-drivers
        Get a list of the known KMS drivers.

  --get-active-kms-drivers
        Get a list of the known KMS drivers which are enabled and the hardware
        is present.

  --get-initrd-kms-drivers INITRD
        Get a list of the known KMS drivers in initrd INITRD.

  --check-dkms-status
        Checks if there are no pending DKMS builds for the currently enabled
        drivers.

  --check-loaded
        Checks that there are no disabled drivers loaded.

  --check-speedboot
        Does --check-dkms-status and --check-loaded.

  --check-loaded-strict
        As --check-loaded, and consider ambigious cases (e.g. nvidia where
        we can't detect if the loaded driver has the correct version) as
        failure.

  --check-initrd INITRD
        Check that INITRD doesn't contain disabled KMS drivers.
EOF
}

# clear global variables

# cache for check_gl()
GL_INODE=

# cache for check_xorg()
XORG_DRIVERS=

# The driver is a KMS enabled driver. This will cause the script to quit
# plymouth when a driver is loaded by --load and NEEDS_LOAD_NOW below is set.
# This is done as plymouth is still attached to the default framebuffer (the
# issues caused by not doing this don't seem to be fatal, though, but the
# display may be lost completely until plymouth eventually stops).
# There is no option in plymouth to "reload" a driver, it expects any KMS
# driver to be loaded be before starting it.
IS_KMS=

# This KMS driver needs to be loaded before X server starts, so load it now
# even if we have to shut down plymouth (see above).
NEEDS_LOAD_NOW=

# dkms module that was built when calling from DKMS
DKMS_AUTOLOAD_MODULE=

# Set by check_loaded() when it can't be sure that the correct driver is loaded
# (e.g. in case of the multiple proprietary nvidia drivers which all identify as
# "nvidia" in loaded modules list).
UNSURE=

case "$1" in
--load)
	load_driver "$2"
	;;
--load-dkms-autoload)
	DKMS_AUTOLOAD_MODULE="$2"
	load_driver "$3"
	;;
--is-disabled)
	check_driver "$2"
	[ $? -eq 1 ]
	# unknown (2) are not considered disabled :)
	;;
--is-enabled-kms)
	check_driver "$2" && [ -n "$IS_KMS" ]
	;;
--is-kms-allowed)
	is_kms_allowed
	;;
--check-dkms-status)
	check_dkms_status
	;;
--get-all-kms-drivers)
	echo $KMS_DRIVERS
	;;
--get-active-kms-drivers)
	get_active_kms_drivers
	;;
--get-initrd-kms-drivers)
	get_initrd_kms_drivers "$2"
	;;
--check-initrd)
	check_initrd "$2"
	;;
--check-loaded)
	check_loaded
	;;
--check-loaded-strict)
	check_loaded && [ -z "$UNSURE" ]
	;;
--check-speedboot)
	check_dkms_status && check_loaded
	;;
*)
	usage
	;;
esac