Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | menu "Generic Driver Options" |
| 2 | |
Michael Marineau | 86d5613 | 2014-04-10 14:09:31 -0700 | [diff] [blame] | 3 | config UEVENT_HELPER |
| 4 | bool "Support for uevent helper" |
| 5 | default y |
Kay Sievers | 6a8d8ab | 2007-08-15 15:38:28 +0200 | [diff] [blame] | 6 | help |
Michael Marineau | 86d5613 | 2014-04-10 14:09:31 -0700 | [diff] [blame] | 7 | The uevent helper program is forked by the kernel for |
Kay Sievers | 6a8d8ab | 2007-08-15 15:38:28 +0200 | [diff] [blame] | 8 | every uevent. |
Kay Sievers | 7934779 | 2010-01-14 22:49:39 +0100 | [diff] [blame] | 9 | Before the switch to the netlink-based uevent source, this was |
| 10 | used to hook hotplug scripts into kernel device events. It |
| 11 | usually pointed to a shell script at /sbin/hotplug. |
| 12 | This should not be used today, because usual systems create |
| 13 | many events at bootup or device discovery in a very short time |
| 14 | frame. One forked process per event can create so many processes |
| 15 | that it creates a high system load, or on smaller systems |
| 16 | it is known to create out-of-memory situations during bootup. |
Kay Sievers | 6a8d8ab | 2007-08-15 15:38:28 +0200 | [diff] [blame] | 17 | |
Michael Marineau | 86d5613 | 2014-04-10 14:09:31 -0700 | [diff] [blame] | 18 | config UEVENT_HELPER_PATH |
| 19 | string "path to uevent helper" |
| 20 | depends on UEVENT_HELPER |
| 21 | default "" |
| 22 | help |
| 23 | To disable user space helper program execution at by default |
| 24 | specify an empty string here. This setting can still be altered |
Márton Németh | 573c977 | 2011-06-19 22:30:16 +0200 | [diff] [blame] | 25 | via /proc/sys/kernel/hotplug or via /sys/kernel/uevent_helper |
| 26 | later at runtime. |
| 27 | |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 28 | config DEVTMPFS |
Kay Sievers | 4237e5f | 2010-01-14 22:47:57 +0100 | [diff] [blame] | 29 | bool "Maintain a devtmpfs filesystem to mount at /dev" |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 30 | help |
Peter Korsgaard | da5e4ef | 2010-03-16 21:55:21 +0100 | [diff] [blame] | 31 | This creates a tmpfs/ramfs filesystem instance early at bootup. |
Kay Sievers | 4237e5f | 2010-01-14 22:47:57 +0100 | [diff] [blame] | 32 | In this filesystem, the kernel driver core maintains device |
| 33 | nodes with their default names and permissions for all |
| 34 | registered devices with an assigned major/minor number. |
| 35 | Userspace can modify the filesystem content as needed, add |
| 36 | symlinks, and apply needed permissions. |
| 37 | It provides a fully functional /dev directory, where usually |
| 38 | udev runs on top, managing permissions and adding meaningful |
| 39 | symlinks. |
| 40 | In very limited environments, it may provide a sufficient |
| 41 | functional /dev without any further help. It also allows simple |
| 42 | rescue systems, and reliably handles dynamic major/minor numbers. |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 43 | |
Peter Korsgaard | da5e4ef | 2010-03-16 21:55:21 +0100 | [diff] [blame] | 44 | Notice: if CONFIG_TMPFS isn't enabled, the simpler ramfs |
| 45 | file system will be used instead. |
| 46 | |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 47 | config DEVTMPFS_MOUNT |
Kay Sievers | 4237e5f | 2010-01-14 22:47:57 +0100 | [diff] [blame] | 48 | bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs" |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 49 | depends on DEVTMPFS |
| 50 | help |
Kay Sievers | 4237e5f | 2010-01-14 22:47:57 +0100 | [diff] [blame] | 51 | This will instruct the kernel to automatically mount the |
| 52 | devtmpfs filesystem at /dev, directly after the kernel has |
| 53 | mounted the root filesystem. The behavior can be overridden |
| 54 | with the commandline parameter: devtmpfs.mount=0|1. |
| 55 | This option does not affect initramfs based booting, here |
| 56 | the devtmpfs filesystem always needs to be mounted manually |
Emilio López | 0feb03a | 2013-12-02 10:59:39 -0300 | [diff] [blame] | 57 | after the rootfs is mounted. |
Kay Sievers | 4237e5f | 2010-01-14 22:47:57 +0100 | [diff] [blame] | 58 | With this option enabled, it allows to bring up a system in |
| 59 | rescue mode with init=/bin/sh, even when the /dev directory |
| 60 | on the rootfs is completely empty. |
Kay Sievers | 2b2af54 | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | config STANDALONE |
Kees Cook | 967857d | 2012-10-23 13:01:50 -0700 | [diff] [blame] | 63 | bool "Select only drivers that don't need compile-time external firmware" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | default y |
| 65 | help |
| 66 | Select this option if you don't have magic firmware for drivers that |
| 67 | need it. |
| 68 | |
| 69 | If unsure, say Y. |
| 70 | |
| 71 | config PREVENT_FIRMWARE_BUILD |
| 72 | bool "Prevent firmware from being built" |
| 73 | default y |
| 74 | help |
| 75 | Say yes to avoid building firmware. Firmware is usually shipped |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 76 | with the driver and only when updating the firmware should a |
| 77 | rebuild be made. |
| 78 | If unsure, say Y here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | config FW_LOADER |
David Rientjes | 6a108a1 | 2011-01-20 14:44:16 -0800 | [diff] [blame] | 81 | tristate "Userspace firmware loading support" if EXPERT |
Adrian Bunk | d9b1919 | 2008-06-10 19:04:08 +0300 | [diff] [blame] | 82 | default y |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | ---help--- |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 84 | This option is provided for the case where none of the in-tree modules |
| 85 | require userspace firmware loading support, but a module built |
| 86 | out-of-tree does. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
David Woodhouse | d172e7f | 2008-06-25 13:56:07 +0100 | [diff] [blame] | 88 | config FIRMWARE_IN_KERNEL |
| 89 | bool "Include in-kernel firmware blobs in kernel binary" |
| 90 | depends on FW_LOADER |
| 91 | default y |
| 92 | help |
| 93 | The kernel source tree includes a number of firmware 'blobs' |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 94 | that are used by various drivers. The recommended way to |
matt mooney | 156faf9 | 2011-06-12 11:17:31 -0700 | [diff] [blame] | 95 | use these is to run "make firmware_install", which, after |
| 96 | converting ihex files to binary, copies all of the needed |
| 97 | binary files in firmware/ to /lib/firmware/ on your system so |
David Woodhouse | d172e7f | 2008-06-25 13:56:07 +0100 | [diff] [blame] | 98 | that they can be loaded by userspace helpers on request. |
| 99 | |
| 100 | Enabling this option will build each required firmware blob |
| 101 | into the kernel directly, where request_firmware() will find |
| 102 | them without having to call out to userspace. This may be |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 103 | useful if your root file system requires a device that uses |
| 104 | such firmware and do not wish to use an initrd. |
David Woodhouse | d172e7f | 2008-06-25 13:56:07 +0100 | [diff] [blame] | 105 | |
| 106 | This single option controls the inclusion of firmware for |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 107 | every driver that uses request_firmware() and ships its |
| 108 | firmware in the kernel source tree, which avoids a |
| 109 | proliferation of 'Include firmware for xxx device' options. |
David Woodhouse | d172e7f | 2008-06-25 13:56:07 +0100 | [diff] [blame] | 110 | |
| 111 | Say 'N' and let firmware be loaded from userspace. |
| 112 | |
David Woodhouse | 4d2acfb | 2008-05-23 13:58:12 +0100 | [diff] [blame] | 113 | config EXTRA_FIRMWARE |
| 114 | string "External firmware blobs to build into the kernel binary" |
| 115 | depends on FW_LOADER |
| 116 | help |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 117 | This option allows firmware to be built into the kernel for the case |
| 118 | where the user either cannot or doesn't want to provide it from |
David Woodhouse | 4d2acfb | 2008-05-23 13:58:12 +0100 | [diff] [blame] | 119 | userspace at runtime (for example, when the firmware in question is |
| 120 | required for accessing the boot device, and the user doesn't want to |
| 121 | use an initrd). |
| 122 | |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 123 | This option is a string and takes the (space-separated) names of the |
| 124 | firmware files -- the same names that appear in MODULE_FIRMWARE() |
David Woodhouse | 4d2acfb | 2008-05-23 13:58:12 +0100 | [diff] [blame] | 125 | and request_firmware() in the source. These files should exist under |
| 126 | the directory specified by the EXTRA_FIRMWARE_DIR option, which is |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 127 | by default the firmware subdirectory of the kernel source tree. |
David Woodhouse | 4d2acfb | 2008-05-23 13:58:12 +0100 | [diff] [blame] | 128 | |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 129 | For example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin", copy |
| 130 | the usb8388.bin file into the firmware directory, and build the kernel. |
| 131 | Then any request_firmware("usb8388.bin") will be satisfied internally |
| 132 | without needing to call out to userspace. |
David Woodhouse | 4d2acfb | 2008-05-23 13:58:12 +0100 | [diff] [blame] | 133 | |
| 134 | WARNING: If you include additional firmware files into your binary |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 135 | kernel image that are not available under the terms of the GPL, |
David Woodhouse | 4d2acfb | 2008-05-23 13:58:12 +0100 | [diff] [blame] | 136 | then it may be a violation of the GPL to distribute the resulting |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 137 | image since it combines both GPL and non-GPL work. You should |
David Woodhouse | 4d2acfb | 2008-05-23 13:58:12 +0100 | [diff] [blame] | 138 | consult a lawyer of your own before distributing such an image. |
| 139 | |
| 140 | config EXTRA_FIRMWARE_DIR |
| 141 | string "Firmware blobs root directory" |
| 142 | depends on EXTRA_FIRMWARE != "" |
| 143 | default "firmware" |
| 144 | help |
| 145 | This option controls the directory in which the kernel build system |
| 146 | looks for the firmware files listed in the EXTRA_FIRMWARE option. |
matt mooney | 113647a | 2011-06-12 11:17:30 -0700 | [diff] [blame] | 147 | The default is firmware/ in the kernel source tree, but by changing |
| 148 | this option you can point it elsewhere, such as /lib/firmware/ or |
| 149 | some other directory containing the firmware files. |
David Woodhouse | 4d2acfb | 2008-05-23 13:58:12 +0100 | [diff] [blame] | 150 | |
Takashi Iwai | 7b1269f | 2013-01-31 11:13:55 +0100 | [diff] [blame] | 151 | config FW_LOADER_USER_HELPER |
Takashi Iwai | 5a1379e | 2014-06-04 17:48:15 +0200 | [diff] [blame] | 152 | bool |
| 153 | |
| 154 | config FW_LOADER_USER_HELPER_FALLBACK |
Takashi Iwai | 7b1269f | 2013-01-31 11:13:55 +0100 | [diff] [blame] | 155 | bool "Fallback user-helper invocation for firmware loading" |
| 156 | depends on FW_LOADER |
Takashi Iwai | 5a1379e | 2014-06-04 17:48:15 +0200 | [diff] [blame] | 157 | select FW_LOADER_USER_HELPER |
Takashi Iwai | 7b1269f | 2013-01-31 11:13:55 +0100 | [diff] [blame] | 158 | help |
| 159 | This option enables / disables the invocation of user-helper |
| 160 | (e.g. udev) for loading firmware files as a fallback after the |
| 161 | direct file loading in kernel fails. The user-mode helper is |
| 162 | no longer required unless you have a special firmware file that |
Takashi Iwai | 5a1379e | 2014-06-04 17:48:15 +0200 | [diff] [blame] | 163 | resides in a non-standard path. Moreover, the udev support has |
| 164 | been deprecated upstream. |
| 165 | |
| 166 | If you are unsure about this, say N here. |
Takashi Iwai | 7b1269f | 2013-01-31 11:13:55 +0100 | [diff] [blame] | 167 | |
Johannes Berg | 833c954 | 2014-09-12 09:01:56 +0200 | [diff] [blame] | 168 | config WANT_DEV_COREDUMP |
| 169 | bool |
| 170 | help |
| 171 | Drivers should "select" this option if they desire to use the |
| 172 | device coredump mechanism. |
| 173 | |
Aristeu Rozanski | 9c60269 | 2014-10-16 11:49:49 -0400 | [diff] [blame^] | 174 | config ENABLE_DEV_COREDUMP |
| 175 | bool "Enable device coredump" if EXPERT |
| 176 | default y |
Johannes Berg | 833c954 | 2014-09-12 09:01:56 +0200 | [diff] [blame] | 177 | help |
Aristeu Rozanski | 9c60269 | 2014-10-16 11:49:49 -0400 | [diff] [blame^] | 178 | This option controls if the device coredump mechanism is available or |
| 179 | not; if disabled, the mechanism will be omitted even if drivers that |
| 180 | can use it are enabled. |
| 181 | Say 'N' for more sensitive systems or systems that don't want |
| 182 | to ever access the information to not have the code, nor keep any |
| 183 | data. |
Johannes Berg | 833c954 | 2014-09-12 09:01:56 +0200 | [diff] [blame] | 184 | |
Aristeu Rozanski | 9c60269 | 2014-10-16 11:49:49 -0400 | [diff] [blame^] | 185 | If unsure, say Y. |
Johannes Berg | 833c954 | 2014-09-12 09:01:56 +0200 | [diff] [blame] | 186 | |
| 187 | config DEV_COREDUMP |
| 188 | bool |
| 189 | default y if WANT_DEV_COREDUMP |
Aristeu Rozanski | 9c60269 | 2014-10-16 11:49:49 -0400 | [diff] [blame^] | 190 | depends on ENABLE_DEV_COREDUMP |
Johannes Berg | 833c954 | 2014-09-12 09:01:56 +0200 | [diff] [blame] | 191 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | config DEBUG_DRIVER |
| 193 | bool "Driver Core verbose debug messages" |
| 194 | depends on DEBUG_KERNEL |
| 195 | help |
| 196 | Say Y here if you want the Driver core to produce a bunch of |
| 197 | debug messages to the system log. Select this if you are having a |
| 198 | problem with the driver core and want to see more of what is |
| 199 | going on. |
| 200 | |
| 201 | If you are unsure about this, say N here. |
| 202 | |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 203 | config DEBUG_DEVRES |
| 204 | bool "Managed device resources verbose debug messages" |
| 205 | depends on DEBUG_KERNEL |
| 206 | help |
| 207 | This option enables kernel parameter devres.log. If set to |
| 208 | non-zero, devres debug messages are printed. Select this if |
| 209 | you are having a problem with devres or want to debug |
| 210 | resource management for a managed device. devres.log can be |
| 211 | switched on and off from sysfs node. |
| 212 | |
| 213 | If you are unsure about this, Say N here. |
| 214 | |
Michael Holzheu | 4039483 | 2006-05-09 12:53:49 +0200 | [diff] [blame] | 215 | config SYS_HYPERVISOR |
| 216 | bool |
| 217 | default n |
Randy Dunlap | eba6cd6 | 2006-10-28 10:38:55 -0700 | [diff] [blame] | 218 | |
Ben Hutchings | 9f13a1f | 2012-01-10 03:04:32 +0000 | [diff] [blame] | 219 | config GENERIC_CPU_DEVICES |
| 220 | bool |
| 221 | default n |
| 222 | |
Ard Biesheuvel | 67bad2f | 2014-02-08 13:34:09 +0100 | [diff] [blame] | 223 | config GENERIC_CPU_AUTOPROBE |
| 224 | bool |
Ard Biesheuvel | 67bad2f | 2014-02-08 13:34:09 +0100 | [diff] [blame] | 225 | |
Lee Jones | 74d1d82 | 2012-02-06 11:22:22 -0800 | [diff] [blame] | 226 | config SOC_BUS |
| 227 | bool |
| 228 | |
Mark Brown | b83a313 | 2011-05-11 19:59:58 +0200 | [diff] [blame] | 229 | source "drivers/base/regmap/Kconfig" |
| 230 | |
Sumit Semwal | d15bd7e | 2011-12-26 14:53:15 +0530 | [diff] [blame] | 231 | config DMA_SHARED_BUFFER |
Dave Airlie | 3b32a59 | 2012-01-13 09:05:14 +0000 | [diff] [blame] | 232 | bool |
Sumit Semwal | d15bd7e | 2011-12-26 14:53:15 +0530 | [diff] [blame] | 233 | default n |
| 234 | select ANON_INODES |
| 235 | 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 | |
Maarten Lankhorst | e941759 | 2014-07-01 12:57:14 +0200 | [diff] [blame] | 241 | config FENCE_TRACE |
| 242 | bool "Enable verbose FENCE_TRACE messages" |
| 243 | depends on DMA_SHARED_BUFFER |
| 244 | help |
| 245 | Enable the FENCE_TRACE printks. This will add extra |
| 246 | 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.V | f825c73 | 2013-07-02 11:15:15 +0530 | [diff] [blame] | 250 | config DMA_CMA |
| 251 | bool "DMA Contiguous Memory Allocator" |
| 252 | depends on HAVE_DMA_CONTIGUOUS && CMA |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 253 | 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 Delvare | f0d6d1f | 2014-10-09 15:29:41 -0700 | [diff] [blame] | 258 | You can disable CMA by specifying "cma=0" on the kernel's command |
| 259 | line. |
| 260 | |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 261 | For more information see <include/linux/dma-contiguous.h>. |
| 262 | If unsure, say "n". |
| 263 | |
Aneesh Kumar K.V | f825c73 | 2013-07-02 11:15:15 +0530 | [diff] [blame] | 264 | if DMA_CMA |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 265 | comment "Default contiguous memory area size:" |
| 266 | |
| 267 | config CMA_SIZE_MBYTES |
| 268 | int "Size in Mega Bytes" |
| 269 | depends on !CMA_SIZE_SEL_PERCENTAGE |
| 270 | default 16 |
| 271 | help |
| 272 | Defines the size (in MiB) of the default memory area for Contiguous |
| 273 | Memory Allocator. |
| 274 | |
| 275 | config CMA_SIZE_PERCENTAGE |
| 276 | int "Percentage of total memory" |
| 277 | depends on !CMA_SIZE_SEL_MBYTES |
| 278 | default 10 |
| 279 | help |
| 280 | Defines the size of the default memory area for Contiguous Memory |
| 281 | Allocator as a percentage of the total memory in the system. |
| 282 | |
| 283 | choice |
| 284 | prompt "Selected region size" |
Laurent Pinchart | 5e97f3f | 2012-10-18 09:29:44 +0200 | [diff] [blame] | 285 | default CMA_SIZE_SEL_MBYTES |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 286 | |
| 287 | config CMA_SIZE_SEL_MBYTES |
| 288 | bool "Use mega bytes value only" |
| 289 | |
| 290 | config CMA_SIZE_SEL_PERCENTAGE |
| 291 | bool "Use percentage value only" |
| 292 | |
| 293 | config CMA_SIZE_SEL_MIN |
| 294 | bool "Use lower value (minimum)" |
| 295 | |
| 296 | config CMA_SIZE_SEL_MAX |
| 297 | bool "Use higher value (maximum)" |
| 298 | |
| 299 | endchoice |
| 300 | |
| 301 | config CMA_ALIGNMENT |
| 302 | int "Maximum PAGE_SIZE order of alignment for contiguous buffers" |
Marc Carino | fe54b1f | 2014-06-04 16:10:01 -0700 | [diff] [blame] | 303 | range 4 12 |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 304 | default 8 |
| 305 | help |
| 306 | DMA mapping framework by default aligns all buffers to the smallest |
| 307 | PAGE_SIZE order which is greater than or equal to the requested buffer |
| 308 | size. This works well for buffers up to a few hundreds kilobytes, but |
| 309 | for larger buffers it just a memory waste. With this parameter you can |
| 310 | specify the maximum PAGE_SIZE order for contiguous buffers. Larger |
| 311 | buffers will be aligned only to this specified order. The order is |
| 312 | expressed as a power of two multiplied by the PAGE_SIZE. |
| 313 | |
| 314 | For example, if your system defaults to 4KiB pages, the order value |
| 315 | of 8 means that the buffers will be aligned up to 1MiB only. |
| 316 | |
| 317 | If unsure, leave the default value "8". |
| 318 | |
Marek Szyprowski | c64be2b | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 319 | endif |
| 320 | |
Randy Dunlap | eba6cd6 | 2006-10-28 10:38:55 -0700 | [diff] [blame] | 321 | endmenu |