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author | Johannes Berg <johannes.berg@intel.com> | 2014-09-12 09:01:56 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-23 22:53:15 -0700 |
commit | 833c95456a70826d1384883b73fd23aff24d366f (patch) | |
tree | be9235e0df06fdc85deb13d1193b6120ed7196bd /drivers/base/Makefile | |
parent | 00e262fd8744678262a0f662f1b5d45fc1f52e10 (diff) | |
download | linux-stable-833c95456a70826d1384883b73fd23aff24d366f.tar.gz linux-stable-833c95456a70826d1384883b73fd23aff24d366f.tar.bz2 linux-stable-833c95456a70826d1384883b73fd23aff24d366f.zip |
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/Makefile')
-rw-r--r-- | drivers/base/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 4aab26ec0292..6922cd6850a2 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o obj-$(CONFIG_REGMAP) += regmap/ obj-$(CONFIG_SOC_BUS) += soc.o obj-$(CONFIG_PINCTRL) += pinctrl.o +obj-$(CONFIG_DEV_COREDUMP) += devcoredump.o ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG |