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authorJohannes Berg <johannes.berg@intel.com>2014-09-12 11:01:56 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-24 09:53:15 +0400
commit833c95456a70826d1384883b73fd23aff24d366f (patch)
treebe9235e0df06fdc85deb13d1193b6120ed7196bd /drivers/base/Kconfig
parent00e262fd8744678262a0f662f1b5d45fc1f52e10 (diff)
downloadlinux-833c95456a70826d1384883b73fd23aff24d366f.tar.xz
device coredump: add new device coredump class
Many devices run firmware and/or complex hardware, and most of that can have bugs. When it misbehaves, however, it is often much harder to debug than software running on the host. Introduce a "device coredump" mechanism to allow dumping internal device/firmware state through a generalized mechanism. As devices are different and information needed can vary accordingly, this doesn't prescribe a file format - it just provides mechanism to get data to be able to capture it in a generalized way (e.g. in distributions.) The dumped data will be readable in sysfs in the virtual device's data file under /sys/class/devcoredump/devcd*/. Writing to it will free the data and remove the device, as does a 5-minute timeout. Note that generalized capturing of such data may result in privacy issues, so users generally need to be involved. In order to allow certain users/system integrators/... to disable the feature at all, introduce a Kconfig option to override the drivers that would like to have the feature. For now, this provides two ways of dumping data: 1) with a vmalloc'ed area, that is then given to the subsystem and freed after retrieval or timeout 2) with a generalized reader/free function method We could/should add more options, e.g. a list of pages, since the vmalloc area is very limited on some architectures. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/Kconfig')
-rw-r--r--drivers/base/Kconfig21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index 4e7f0ff83ae7..134f763d90fd 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -165,6 +165,27 @@ config FW_LOADER_USER_HELPER_FALLBACK
If you are unsure about this, say N here.
+config WANT_DEV_COREDUMP
+ bool
+ help
+ Drivers should "select" this option if they desire to use the
+ device coredump mechanism.
+
+config DISABLE_DEV_COREDUMP
+ bool "Disable device coredump" if EXPERT
+ help
+ Disable the device coredump mechanism despite drivers wanting to
+ use it; this allows for more sensitive systems or systems that
+ don't want to ever access the information to not have the code,
+ nor keep any data.
+
+ If unsure, say N.
+
+config DEV_COREDUMP
+ bool
+ default y if WANT_DEV_COREDUMP
+ depends on !DISABLE_DEV_COREDUMP
+
config DEBUG_DRIVER
bool "Driver Core verbose debug messages"
depends on DEBUG_KERNEL