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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001# SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002menu "Generic Driver Options"
3
Michael Marineau86d56132014-04-10 14:09:31 -07004config UEVENT_HELPER
5 bool "Support for uevent helper"
6 default y
Kay Sievers6a8d8ab2007-08-15 15:38:28 +02007 help
Michael Marineau86d56132014-04-10 14:09:31 -07008 The uevent helper program is forked by the kernel for
Kay Sievers6a8d8ab2007-08-15 15:38:28 +02009 every uevent.
Kay Sievers79347792010-01-14 22:49:39 +010010 Before the switch to the netlink-based uevent source, this was
11 used to hook hotplug scripts into kernel device events. It
12 usually pointed to a shell script at /sbin/hotplug.
13 This should not be used today, because usual systems create
14 many events at bootup or device discovery in a very short time
15 frame. One forked process per event can create so many processes
16 that it creates a high system load, or on smaller systems
17 it is known to create out-of-memory situations during bootup.
Kay Sievers6a8d8ab2007-08-15 15:38:28 +020018
Michael Marineau86d56132014-04-10 14:09:31 -070019config UEVENT_HELPER_PATH
20 string "path to uevent helper"
21 depends on UEVENT_HELPER
22 default ""
23 help
24 To disable user space helper program execution at by default
25 specify an empty string here. This setting can still be altered
Márton Németh573c9772011-06-19 22:30:16 +020026 via /proc/sys/kernel/hotplug or via /sys/kernel/uevent_helper
27 later at runtime.
28
Kay Sievers2b2af542009-04-30 15:23:42 +020029config DEVTMPFS
Kay Sievers4237e5f2010-01-14 22:47:57 +010030 bool "Maintain a devtmpfs filesystem to mount at /dev"
Kay Sievers2b2af542009-04-30 15:23:42 +020031 help
Peter Korsgaardda5e4ef2010-03-16 21:55:21 +010032 This creates a tmpfs/ramfs filesystem instance early at bootup.
Kay Sievers4237e5f2010-01-14 22:47:57 +010033 In this filesystem, the kernel driver core maintains device
34 nodes with their default names and permissions for all
35 registered devices with an assigned major/minor number.
36 Userspace can modify the filesystem content as needed, add
37 symlinks, and apply needed permissions.
38 It provides a fully functional /dev directory, where usually
39 udev runs on top, managing permissions and adding meaningful
40 symlinks.
41 In very limited environments, it may provide a sufficient
42 functional /dev without any further help. It also allows simple
43 rescue systems, and reliably handles dynamic major/minor numbers.
Kay Sievers2b2af542009-04-30 15:23:42 +020044
Peter Korsgaardda5e4ef2010-03-16 21:55:21 +010045 Notice: if CONFIG_TMPFS isn't enabled, the simpler ramfs
46 file system will be used instead.
47
Kay Sievers2b2af542009-04-30 15:23:42 +020048config DEVTMPFS_MOUNT
Kay Sievers4237e5f2010-01-14 22:47:57 +010049 bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs"
Kay Sievers2b2af542009-04-30 15:23:42 +020050 depends on DEVTMPFS
51 help
Kay Sievers4237e5f2010-01-14 22:47:57 +010052 This will instruct the kernel to automatically mount the
53 devtmpfs filesystem at /dev, directly after the kernel has
54 mounted the root filesystem. The behavior can be overridden
55 with the commandline parameter: devtmpfs.mount=0|1.
56 This option does not affect initramfs based booting, here
57 the devtmpfs filesystem always needs to be mounted manually
Emilio López0feb03a2013-12-02 10:59:39 -030058 after the rootfs is mounted.
Kay Sievers4237e5f2010-01-14 22:47:57 +010059 With this option enabled, it allows to bring up a system in
60 rescue mode with init=/bin/sh, even when the /dev directory
61 on the rootfs is completely empty.
Kay Sievers2b2af542009-04-30 15:23:42 +020062
Linus Torvalds1da177e2005-04-16 15:20:36 -070063config STANDALONE
Kees Cook967857d2012-10-23 13:01:50 -070064 bool "Select only drivers that don't need compile-time external firmware"
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 default y
66 help
67 Select this option if you don't have magic firmware for drivers that
68 need it.
69
70 If unsure, say Y.
71
72config PREVENT_FIRMWARE_BUILD
73 bool "Prevent firmware from being built"
74 default y
75 help
76 Say yes to avoid building firmware. Firmware is usually shipped
matt mooney113647a2011-06-12 11:17:30 -070077 with the driver and only when updating the firmware should a
78 rebuild be made.
79 If unsure, say Y here.
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81config FW_LOADER
David Rientjes6a108a12011-01-20 14:44:16 -080082 tristate "Userspace firmware loading support" if EXPERT
Adrian Bunkd9b19192008-06-10 19:04:08 +030083 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 ---help---
matt mooney113647a2011-06-12 11:17:30 -070085 This option is provided for the case where none of the in-tree modules
86 require userspace firmware loading support, but a module built
87 out-of-tree does.
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Benjamin Gilbert7f55c732018-01-23 18:06:31 -080089config EXTRA_FIRMWARE
90 string "External firmware blobs to build into the kernel binary"
David Woodhoused172e7f2008-06-25 13:56:07 +010091 depends on FW_LOADER
David Woodhoused172e7f2008-06-25 13:56:07 +010092 help
Robin H. Johnson0946b2f2017-11-16 14:36:12 -080093 Various drivers in the kernel source tree may require firmware,
94 which is generally available in your distribution's linux-firmware
95 package.
96
97 The linux-firmware package should install firmware into
98 /lib/firmware/ on your system, so they can be loaded by userspace
99 helpers on request.
David Woodhoused172e7f2008-06-25 13:56:07 +0100100
matt mooney113647a2011-06-12 11:17:30 -0700101 This option allows firmware to be built into the kernel for the case
102 where the user either cannot or doesn't want to provide it from
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100103 userspace at runtime (for example, when the firmware in question is
104 required for accessing the boot device, and the user doesn't want to
105 use an initrd).
106
matt mooney113647a2011-06-12 11:17:30 -0700107 This option is a string and takes the (space-separated) names of the
108 firmware files -- the same names that appear in MODULE_FIRMWARE()
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100109 and request_firmware() in the source. These files should exist under
110 the directory specified by the EXTRA_FIRMWARE_DIR option, which is
Benjamin Gilbert7f55c732018-01-23 18:06:31 -0800111 /lib/firmware by default.
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100112
matt mooney113647a2011-06-12 11:17:30 -0700113 For example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin", copy
Benjamin Gilbert7f55c732018-01-23 18:06:31 -0800114 the usb8388.bin file into /lib/firmware, and build the kernel. Then
115 any request_firmware("usb8388.bin") will be satisfied internally
matt mooney113647a2011-06-12 11:17:30 -0700116 without needing to call out to userspace.
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100117
118 WARNING: If you include additional firmware files into your binary
matt mooney113647a2011-06-12 11:17:30 -0700119 kernel image that are not available under the terms of the GPL,
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100120 then it may be a violation of the GPL to distribute the resulting
matt mooney113647a2011-06-12 11:17:30 -0700121 image since it combines both GPL and non-GPL work. You should
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100122 consult a lawyer of your own before distributing such an image.
123
124config EXTRA_FIRMWARE_DIR
125 string "Firmware blobs root directory"
126 depends on EXTRA_FIRMWARE != ""
Markus Trippelsdorfdf85b2d2017-09-16 11:01:16 +0200127 default "/lib/firmware"
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100128 help
129 This option controls the directory in which the kernel build system
130 looks for the firmware files listed in the EXTRA_FIRMWARE option.
David Woodhouse4d2acfb2008-05-23 13:58:12 +0100131
Takashi Iwai7b1269f2013-01-31 11:13:55 +0100132config FW_LOADER_USER_HELPER
Takashi Iwai5a1379e2014-06-04 17:48:15 +0200133 bool
134
135config FW_LOADER_USER_HELPER_FALLBACK
Takashi Iwai7b1269f2013-01-31 11:13:55 +0100136 bool "Fallback user-helper invocation for firmware loading"
137 depends on FW_LOADER
Takashi Iwai5a1379e2014-06-04 17:48:15 +0200138 select FW_LOADER_USER_HELPER
Takashi Iwai7b1269f2013-01-31 11:13:55 +0100139 help
140 This option enables / disables the invocation of user-helper
141 (e.g. udev) for loading firmware files as a fallback after the
142 direct file loading in kernel fails. The user-mode helper is
143 no longer required unless you have a special firmware file that
Takashi Iwai5a1379e2014-06-04 17:48:15 +0200144 resides in a non-standard path. Moreover, the udev support has
145 been deprecated upstream.
146
147 If you are unsure about this, say N here.
Takashi Iwai7b1269f2013-01-31 11:13:55 +0100148
Johannes Berg833c9542014-09-12 09:01:56 +0200149config WANT_DEV_COREDUMP
150 bool
151 help
152 Drivers should "select" this option if they desire to use the
153 device coredump mechanism.
154
Johannes Bergcd3d9ea2014-10-30 10:00:35 +0100155config ALLOW_DEV_COREDUMP
156 bool "Allow device coredump" if EXPERT
Aristeu Rozanski9c602692014-10-16 11:49:49 -0400157 default y
Johannes Berg833c9542014-09-12 09:01:56 +0200158 help
Aristeu Rozanski9c602692014-10-16 11:49:49 -0400159 This option controls if the device coredump mechanism is available or
160 not; if disabled, the mechanism will be omitted even if drivers that
161 can use it are enabled.
162 Say 'N' for more sensitive systems or systems that don't want
163 to ever access the information to not have the code, nor keep any
164 data.
Johannes Berg833c9542014-09-12 09:01:56 +0200165
Aristeu Rozanski9c602692014-10-16 11:49:49 -0400166 If unsure, say Y.
Johannes Berg833c9542014-09-12 09:01:56 +0200167
168config DEV_COREDUMP
169 bool
170 default y if WANT_DEV_COREDUMP
Johannes Bergcd3d9ea2014-10-30 10:00:35 +0100171 depends on ALLOW_DEV_COREDUMP
Johannes Berg833c9542014-09-12 09:01:56 +0200172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173config DEBUG_DRIVER
174 bool "Driver Core verbose debug messages"
175 depends on DEBUG_KERNEL
176 help
177 Say Y here if you want the Driver core to produce a bunch of
178 debug messages to the system log. Select this if you are having a
179 problem with the driver core and want to see more of what is
180 going on.
181
182 If you are unsure about this, say N here.
183
Tejun Heo9ac78492007-01-20 16:00:26 +0900184config DEBUG_DEVRES
185 bool "Managed device resources verbose debug messages"
186 depends on DEBUG_KERNEL
187 help
188 This option enables kernel parameter devres.log. If set to
189 non-zero, devres debug messages are printed. Select this if
190 you are having a problem with devres or want to debug
191 resource management for a managed device. devres.log can be
192 switched on and off from sysfs node.
193
194 If you are unsure about this, Say N here.
195
Rob Herringbea5b152016-08-11 10:20:58 -0500196config DEBUG_TEST_DRIVER_REMOVE
Laura Abbott248ff022016-10-07 09:09:30 -0700197 bool "Test driver remove calls during probe (UNSTABLE)"
Rob Herringbea5b152016-08-11 10:20:58 -0500198 depends on DEBUG_KERNEL
199 help
200 Say Y here if you want the Driver core to test driver remove functions
201 by calling probe, remove, probe. This tests the remove path without
202 having to unbind the driver or unload the driver module.
203
Laura Abbott248ff022016-10-07 09:09:30 -0700204 This option is expected to find errors and may render your system
205 unusable. You should say N here unless you are explicitly looking to
206 test this functionality.
Rob Herringbea5b152016-08-11 10:20:58 -0500207
Dmitry Torokhov79543cf2016-09-29 17:13:14 +0200208source "drivers/base/test/Kconfig"
209
Michael Holzheu40394832006-05-09 12:53:49 +0200210config SYS_HYPERVISOR
211 bool
212 default n
Randy Dunlapeba6cd62006-10-28 10:38:55 -0700213
Ben Hutchings9f13a1f2012-01-10 03:04:32 +0000214config GENERIC_CPU_DEVICES
215 bool
216 default n
217
Ard Biesheuvel67bad2f2014-02-08 13:34:09 +0100218config GENERIC_CPU_AUTOPROBE
219 bool
Ard Biesheuvel67bad2f2014-02-08 13:34:09 +0100220
Thomas Gleixner87590ce2018-01-07 22:48:00 +0100221config GENERIC_CPU_VULNERABILITIES
222 bool
223
Lee Jones74d1d822012-02-06 11:22:22 -0800224config SOC_BUS
225 bool
Arnd Bergmannc97db7c2016-09-21 14:57:19 +0800226 select GLOB
Lee Jones74d1d822012-02-06 11:22:22 -0800227
Mark Brownb83a3132011-05-11 19:59:58 +0200228source "drivers/base/regmap/Kconfig"
229
Sumit Semwald15bd7e2011-12-26 14:53:15 +0530230config DMA_SHARED_BUFFER
Dave Airlie3b32a592012-01-13 09:05:14 +0000231 bool
Sumit Semwald15bd7e2011-12-26 14:53:15 +0530232 default n
233 select ANON_INODES
Chris Wilson03e4e0a2017-11-14 16:27:19 +0000234 select IRQ_WORK
Sumit Semwald15bd7e2011-12-26 14:53:15 +0530235 help
236 This option enables the framework for buffer-sharing between
237 multiple drivers. A buffer is associated with a file using driver
238 APIs extension; the file's descriptor can then be passed on to other
239 driver.
240
Chris Wilsonf54d1862016-10-25 13:00:45 +0100241config DMA_FENCE_TRACE
242 bool "Enable verbose DMA_FENCE_TRACE messages"
Maarten Lankhorste9417592014-07-01 12:57:14 +0200243 depends on DMA_SHARED_BUFFER
244 help
Chris Wilsonf54d1862016-10-25 13:00:45 +0100245 Enable the DMA_FENCE_TRACE printks. This will add extra
Maarten Lankhorste9417592014-07-01 12:57:14 +0200246 spam to the console log, but will make it easier to diagnose
247 lockup related problems for dma-buffers shared across multiple
248 devices.
249
Aneesh Kumar K.Vf825c732013-07-02 11:15:15 +0530250config DMA_CMA
251 bool "DMA Contiguous Memory Allocator"
252 depends on HAVE_DMA_CONTIGUOUS && CMA
Marek Szyprowskic64be2b2011-12-29 13:09:51 +0100253 help
254 This enables the Contiguous Memory Allocator which allows drivers
255 to allocate big physically-contiguous blocks of memory for use with
256 hardware components that do not support I/O map nor scatter-gather.
257
Jean Delvaref0d6d1f2014-10-09 15:29:41 -0700258 You can disable CMA by specifying "cma=0" on the kernel's command
259 line.
260
Marek Szyprowskic64be2b2011-12-29 13:09:51 +0100261 For more information see <include/linux/dma-contiguous.h>.
262 If unsure, say "n".
263
Aneesh Kumar K.Vf825c732013-07-02 11:15:15 +0530264if DMA_CMA
Marek Szyprowskic64be2b2011-12-29 13:09:51 +0100265comment "Default contiguous memory area size:"
266
267config CMA_SIZE_MBYTES
268 int "Size in Mega Bytes"
269 depends on !CMA_SIZE_SEL_PERCENTAGE
Akinobu Mitad7be0032014-12-10 15:43:14 -0800270 default 0 if X86
Marek Szyprowskic64be2b2011-12-29 13:09:51 +0100271 default 16
272 help
273 Defines the size (in MiB) of the default memory area for Contiguous
Akinobu Mitad7be0032014-12-10 15:43:14 -0800274 Memory Allocator. If the size of 0 is selected, CMA is disabled by
275 default, but it can be enabled by passing cma=size[MG] to the kernel.
276
Marek Szyprowskic64be2b2011-12-29 13:09:51 +0100277
278config CMA_SIZE_PERCENTAGE
279 int "Percentage of total memory"
280 depends on !CMA_SIZE_SEL_MBYTES
Akinobu Mitad7be0032014-12-10 15:43:14 -0800281 default 0 if X86
Marek Szyprowskic64be2b2011-12-29 13:09:51 +0100282 default 10
283 help
284 Defines the size of the default memory area for Contiguous Memory
285 Allocator as a percentage of the total memory in the system.
Akinobu Mitad7be0032014-12-10 15:43:14 -0800286 If 0 percent is selected, CMA is disabled by default, but it can be
287 enabled by passing cma=size[MG] to the kernel.
Marek Szyprowskic64be2b2011-12-29 13:09:51 +0100288
289choice
290 prompt "Selected region size"
Laurent Pinchart5e97f3f2012-10-18 09:29:44 +0200291 default CMA_SIZE_SEL_MBYTES
Marek Szyprowskic64be2b2011-12-29 13:09:51 +0100292
293config CMA_SIZE_SEL_MBYTES
294 bool "Use mega bytes value only"
295
296config CMA_SIZE_SEL_PERCENTAGE
297 bool "Use percentage value only"
298
299config CMA_SIZE_SEL_MIN
300 bool "Use lower value (minimum)"
301
302config CMA_SIZE_SEL_MAX
303 bool "Use higher value (maximum)"
304
305endchoice
306
307config CMA_ALIGNMENT
308 int "Maximum PAGE_SIZE order of alignment for contiguous buffers"
Marc Carinofe54b1f2014-06-04 16:10:01 -0700309 range 4 12
Marek Szyprowskic64be2b2011-12-29 13:09:51 +0100310 default 8
311 help
312 DMA mapping framework by default aligns all buffers to the smallest
313 PAGE_SIZE order which is greater than or equal to the requested buffer
314 size. This works well for buffers up to a few hundreds kilobytes, but
315 for larger buffers it just a memory waste. With this parameter you can
316 specify the maximum PAGE_SIZE order for contiguous buffers. Larger
317 buffers will be aligned only to this specified order. The order is
318 expressed as a power of two multiplied by the PAGE_SIZE.
319
320 For example, if your system defaults to 4KiB pages, the order value
321 of 8 means that the buffers will be aligned up to 1MiB only.
322
323 If unsure, leave the default value "8".
324
Marek Szyprowskic64be2b2011-12-29 13:09:51 +0100325endif
326
Juri Lelli2ef7a292017-05-31 17:59:28 +0100327config GENERIC_ARCH_TOPOLOGY
328 bool
329 help
330 Enable support for architectures common topology code: e.g., parsing
331 CPU capacity information from DT, usage of such information for
332 appropriate scaling, sysfs interface for changing capacity values at
333 runtime.
334
Randy Dunlapeba6cd62006-10-28 10:38:55 -0700335endmenu