833c95456a
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>
27 lines
889 B
Makefile
27 lines
889 B
Makefile
# Makefile for the Linux device tree
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obj-y := component.o core.o bus.o dd.o syscore.o \
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driver.o class.o platform.o \
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cpu.o firmware.o init.o map.o devres.o \
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attribute_container.o transport_class.o \
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topology.o container.o
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obj-$(CONFIG_DEVTMPFS) += devtmpfs.o
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obj-$(CONFIG_DMA_CMA) += dma-contiguous.o
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obj-y += power/
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obj-$(CONFIG_HAS_DMA) += dma-mapping.o
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obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
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obj-$(CONFIG_ISA) += isa.o
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obj-$(CONFIG_FW_LOADER) += firmware_class.o
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obj-$(CONFIG_NUMA) += node.o
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obj-$(CONFIG_MEMORY_HOTPLUG_SPARSE) += memory.o
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ifeq ($(CONFIG_SYSFS),y)
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obj-$(CONFIG_MODULES) += module.o
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endif
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obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o
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obj-$(CONFIG_REGMAP) += regmap/
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obj-$(CONFIG_SOC_BUS) += soc.o
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obj-$(CONFIG_PINCTRL) += pinctrl.o
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obj-$(CONFIG_DEV_COREDUMP) += devcoredump.o
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ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
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