From 833c95456a70826d1384883b73fd23aff24d366f Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 12 Sep 2014 09:01:56 +0200 Subject: 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 Signed-off-by: Greg Kroah-Hartman --- drivers/base/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/base/Makefile') diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 4aab26ec029..6922cd6850a 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 -- cgit v1.2.3-70-g09d2