Re: [PATCH v3 4/6] coresight: syscfg: Example CoreSight configuration loadable module

[Mathieu Poirier <mathieu.poirier@linaro.org>]

On Wed, Nov 24, 2021 at 08:00:36PM +0000, Mike Leach wrote:
> An example of creating a loadable module to add CoreSight configurations
> into a system.
> 
> In the Kernel samples/coresight directory.
> 
> Signed-off-by: Mike Leach <mike.leach@linaro.org>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> ---
>  MAINTAINERS                              |  1 +
>  samples/Kconfig                          |  9 +++
>  samples/Makefile                         |  1 +
>  samples/coresight/Makefile               |  4 ++
>  samples/coresight/coresight-cfg-sample.c | 73 ++++++++++++++++++++++++
>  5 files changed, 88 insertions(+)
>  create mode 100644 samples/coresight/Makefile
>  create mode 100644 samples/coresight/coresight-cfg-sample.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7a2345ce8521..85242fdd3b8c 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1890,6 +1890,7 @@ F:	Documentation/trace/coresight/*
>  F:	drivers/hwtracing/coresight/*
>  F:	include/dt-bindings/arm/coresight-cti-dt.h
>  F:	include/linux/coresight*
> +F:	samples/coresight/*
>  F:	tools/perf/arch/arm/util/auxtrace.c
>  F:	tools/perf/arch/arm/util/cs-etm.c
>  F:	tools/perf/arch/arm/util/cs-etm.h
> diff --git a/samples/Kconfig b/samples/Kconfig
> index bec3528aa2de..fe8b56d576ce 100644
> --- a/samples/Kconfig
> +++ b/samples/Kconfig
> @@ -232,6 +232,15 @@ config SAMPLE_WATCH_QUEUE
>  	  Build example userspace program to use the new mount_notify(),
>  	  sb_notify() syscalls and the KEYCTL_WATCH_KEY keyctl() function.
>  
> +config SAMPLE_CORESIGHT_SYSCFG
> +	tristate "Build example loadable module for CoreSight config"
> +	depends on CORESIGHT && m
> +	help
> +	  Build an example loadable module that adds new CoreSight features
> +	  and configuration using the CoreSight system configuration API.
> +	  This demonstrates how a user may create their own CoreSight
> +	  configurations and easily load them into the system at runtime.
> +
>  endif # SAMPLES
>  
>  config HAVE_SAMPLE_FTRACE_DIRECT
> diff --git a/samples/Makefile b/samples/Makefile
> index b7b98307c2b4..c148ada64beb 100644
> --- a/samples/Makefile
> +++ b/samples/Makefile
> @@ -32,3 +32,4 @@ obj-$(CONFIG_SAMPLE_INTEL_MEI)		+= mei/
>  subdir-$(CONFIG_SAMPLE_WATCHDOG)	+= watchdog
>  subdir-$(CONFIG_SAMPLE_WATCH_QUEUE)	+= watch_queue
>  obj-$(CONFIG_DEBUG_KMEMLEAK_TEST)	+= kmemleak/
> +obj-$(CONFIG_SAMPLE_CORESIGHT_SYSCFG)	+= coresight/
> diff --git a/samples/coresight/Makefile b/samples/coresight/Makefile
> new file mode 100644
> index 000000000000..b3fce4af2347
> --- /dev/null
> +++ b/samples/coresight/Makefile
> @@ -0,0 +1,4 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +
> +obj-$(CONFIG_SAMPLE_CORESIGHT_SYSCFG) += coresight-cfg-sample.o
> +ccflags-y += -I$(srctree)/drivers/hwtracing/coresight
> diff --git a/samples/coresight/coresight-cfg-sample.c b/samples/coresight/coresight-cfg-sample.c
> new file mode 100644
> index 000000000000..25485c80b5e3
> --- /dev/null
> +++ b/samples/coresight/coresight-cfg-sample.c
> @@ -0,0 +1,73 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright(C) 2020 Linaro Limited. All rights reserved.
> + * Author: Mike Leach <mike.leach@linaro.org>
> + */
> +
> +#include "coresight-config.h"
> +#include "coresight-syscfg.h"
> +
> +/* create an alternate autofdo configuration */
> +
> +/* we will provide 4 sets of preset parameter values */
> +#define AFDO2_NR_PRESETS	4
> +/* the total number of parameters in used features - strobing has 2 */
> +#define AFDO2_NR_PARAM_SUM	2
> +
> +static const char *afdo2_ref_names[] = {
> +	"strobing",

Checkpatch is complaining the above should be "static const char * const ..."  I
can't remember if we talked about this before - did we?

Do you want me to make the modification?


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