Quoting Chris Wilson (2016-08-03 20:38:53)
> In the next merge, we can build support for kcov at the individual file,
Since a4691deabf28 ("kcov: allow more fine-grained coverage instrumentation"),
> or driver level. This is useful to filter out the noise when doing
> coverage test, i.e. we do get edges through code outside of i915.ko.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/Kconfig.debug | 12 ++++++++++++
> drivers/gpu/drm/i915/Makefile | 1 +
> 2 files changed, 13 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/Kconfig.debug b/drivers/gpu/drm/i915/Kconfig.debug
> index cee87bfd10c4..eb38270d0ecd 100644
> --- a/drivers/gpu/drm/i915/Kconfig.debug
> +++ b/drivers/gpu/drm/i915/Kconfig.debug
> @@ -42,3 +42,15 @@ config DRM_I915_DEBUG_GEM
>
> If in doubt, say "N".
>
> +config DRM_I915_KCOV
> + bool "Generate fine-grained code coverage (for kcov)"
> + default n
> + select KCOV
> + help
> + Enable instrumentation of i915.ko to generate coverage via kcov
> + (/sys/kernel/debug/kcov). This allows coverage driven fuzzing,
> + such as AFL, to be used and focused on the driver.
> +
> + Recommended for driver developers only.
> +
> + If in doubt, say "N".
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 0afe7b3cad07..2f4bbaca5b60 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -3,6 +3,7 @@
> # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
>
> subdir-ccflags-$(CONFIG_DRM_I915_WERROR) := -Werror
> +subdir-ccflags-$(CONFIG_DRM_I915_KCOV) := $(CFLAGS_KCOV)
> subdir-ccflags-y += \
> $(call as-instr,movntdqa (%eax)$(comma)%xmm0,-DCONFIG_AS_MOVNTDQA)
>
> --
> 2.8.1
>
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