Re: [PATCH 3/4] coresight: allow to build as modules

From: Randy Dunlap
Date: Tue May 08 2018 - 15:31:28 EST

Next message: Alex Williamson: "Re: [PATCH v4 04/14] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches"
Previous message: Long Li: "RE: [PATCH 1/7] cifs: smbd: Make upper layer decide when to destroy the transport"
In reply to: Kim Phillips: "[PATCH 3/4] coresight: allow to build as modules"
Next in thread: Kim Phillips: "Re: [PATCH 3/4] coresight: allow to build as modules"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hi,

On 05/08/2018 12:06 PM, Kim Phillips wrote:

> Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
> Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
> Signed-off-by: Kim Phillips <kim.phillips@xxxxxxx>
> ---

> drivers/hwtracing/coresight/Kconfig | 63 +++++++++++++------
> drivers/hwtracing/coresight/Makefile | 28 ++++++---
> .../hwtracing/coresight/coresight-cpu-debug.c | 2 +
> .../coresight/coresight-dynamic-replicator.c | 30 ++++++++-
> drivers/hwtracing/coresight/coresight-etb10.c | 32 +++++++++-
> .../hwtracing/coresight/coresight-etm-cp14.c | 4 ++
> .../hwtracing/coresight/coresight-etm-perf.c | 13 +++-
> .../hwtracing/coresight/coresight-etm-perf.h | 2 +-
> .../coresight/coresight-etm3x-sysfs.c | 6 ++
> drivers/hwtracing/coresight/coresight-etm3x.c | 37 ++++++++++-
> .../coresight/coresight-etm4x-sysfs.c | 6 ++
> drivers/hwtracing/coresight/coresight-etm4x.c | 38 ++++++++++-
> .../hwtracing/coresight/coresight-funnel.c | 30 ++++++++-
> drivers/hwtracing/coresight/coresight-priv.h | 10 ++-
> .../coresight/coresight-replicator.c | 33 +++++++++-
> drivers/hwtracing/coresight/coresight-stm.c | 27 +++++++-
> .../hwtracing/coresight/coresight-tmc-etf.c | 2 +
> .../hwtracing/coresight/coresight-tmc-etr.c | 2 +
> drivers/hwtracing/coresight/coresight-tmc.c | 34 +++++++++-
> drivers/hwtracing/coresight/coresight-tpiu.c | 31 ++++++++-
> drivers/hwtracing/coresight/coresight.c | 49 ++++++++++++---
> include/linux/coresight.h | 23 +------
> 22 files changed, 418 insertions(+), 84 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
> index ef9cb3c164e1..09a682013ea2 100644
> --- a/drivers/hwtracing/coresight/Kconfig
> +++ b/drivers/hwtracing/coresight/Kconfig
> @@ -2,8 +2,8 @@
> # Coresight configuration
> #
> menuconfig CORESIGHT
> - bool "CoreSight Tracing Support"
> - select ARM_AMBA
> + tristate "CoreSight Tracing Support"
> + depends on ARM_AMBA
> select PERF_EVENTS
> help
> This framework provides a kernel interface for the CoreSight debug
> @@ -12,17 +12,24 @@ menuconfig CORESIGHT
> specification and configure the right series of components when a
> trace source gets enabled.
>
> + To compile this code as a module, choose M here: the
> + module will be called coresight-core.
> +
> if CORESIGHT
> config CORESIGHT_LINKS_AND_SINKS
> - bool "CoreSight Link and Sink drivers"
> + tristate "CoreSight Link and Sink drivers"
> + depends on CORESIGHT

The "if CORESIGHT" line serves as a "depends on CORESIGHT" for the entire "if"
block, so please don't repeat the "depends on" here.

> help
> This enables support for CoreSight link and sink drivers that are
> responsible for transporting and collecting the trace data
> respectively. Link and sinks are dynamically aggregated with a trace
> entity at run time to form a complete trace path.
>
> + To compile this code as modules, choose M here: the
> + modules will be called coresight-funnel and coresight-replicator.
> +
> config CORESIGHT_LINK_AND_SINK_TMC
> - bool "Coresight generic TMC driver"
> + tristate "Coresight generic TMC driver"
> depends on CORESIGHT_LINKS_AND_SINKS
> help
> This enables support for the Trace Memory Controller driver.
> @@ -31,8 +38,11 @@ config CORESIGHT_LINK_AND_SINK_TMC
> complies with the generic implementation of the component without
> special enhancement or added features.
>
> + To compile this code as a module, choose M here: the
> + module will be called coresight-tmc-core.
> +
> config CORESIGHT_SINK_TPIU
> - bool "Coresight generic TPIU driver"
> + tristate "Coresight generic TPIU driver"
> depends on CORESIGHT_LINKS_AND_SINKS
> help
> This enables support for the Trace Port Interface Unit driver,
> @@ -42,57 +52,71 @@ config CORESIGHT_SINK_TPIU
> connected to an external host for use case capturing more traces than
> the on-board coresight memory can handle.
>
> + To compile this code as a module, choose M here: the
> + module will be called coresight-tpiu.
> +
> config CORESIGHT_SINK_ETBV10
> - bool "Coresight ETBv1.0 driver"
> + tristate "Coresight ETBv1.0 driver"
> depends on CORESIGHT_LINKS_AND_SINKS
> help
> This enables support for the Embedded Trace Buffer version 1.0 driver
> that complies with the generic implementation of the component without
> special enhancement or added features.
>
> + To compile this code as a module, choose M here: the
> + module will be called coresight-etb10.
> +
> config CORESIGHT_SOURCE_ETM3X
> - bool "CoreSight Embedded Trace Macrocell 3.x driver"
> - depends on !ARM64
> - select CORESIGHT_LINKS_AND_SINKS
> + tristate "CoreSight Embedded Trace Macrocell 3.x driver"
> + depends on !ARM64 && CORESIGHT_LINKS_AND_SINKS
> help
> This driver provides support for processor ETM3.x and PTM1.x modules,
> which allows tracing the instructions that a processor is executing
> This is primarily useful for instruction level tracing. Depending
> the ETM version data tracing may also be available.
>
> + To compile this code as a module, choose M here: the
> + module will be called coresight-etm3x-core.
> +
> config CORESIGHT_SOURCE_ETM4X
> - bool "CoreSight Embedded Trace Macrocell 4.x driver"
> - depends on ARM64
> - select CORESIGHT_LINKS_AND_SINKS
> + tristate "CoreSight Embedded Trace Macrocell 4.x driver"
> + depends on ARM64 && CORESIGHT_LINKS_AND_SINKS
> help
> This driver provides support for the ETM4.x tracer module, tracing the
> instructions that a processor is executing. This is primarily useful
> for instruction level tracing. Depending on the implemented version
> data tracing may also be available.
>
> + To compile this code as a module, choose M here: the
> + module will be called coresight-etm4x-core.
> +
> config CORESIGHT_DYNAMIC_REPLICATOR
> - bool "CoreSight Programmable Replicator driver"
> + tristate "CoreSight Programmable Replicator driver"
> depends on CORESIGHT_LINKS_AND_SINKS
> help
> This enables support for dynamic CoreSight replicator link driver.
> The programmable ATB replicator allows independent filtering of the
> trace data based on the traceid.
>
> + To compile this code as a module, choose M here: the
> + module will be called coresight-dynamic-replicator.
> +
> config CORESIGHT_STM
> - bool "CoreSight System Trace Macrocell driver"
> + tristate "CoreSight System Trace Macrocell driver"
> depends on (ARM && !(CPU_32v3 || CPU_32v4 || CPU_32v4T)) || ARM64
> - select CORESIGHT_LINKS_AND_SINKS
> - select STM
> + depends on STM && CORESIGHT_LINKS_AND_SINKS
> help
> This driver provides support for hardware assisted software
> instrumentation based tracing. This is primarily used for
> logging useful software events or data coming from various entities
> in the system, possibly running different OSs
>
> + To compile this code as a module, choose M here: the
> + module will be called coresight-stm.
> +
> config CORESIGHT_CPU_DEBUG
> tristate "CoreSight CPU Debug driver"
> - depends on ARM || ARM64
> - depends on DEBUG_FS
> + depends on CORESIGHT && DEBUG_FS

"depends on CORESIGHT" is not needed if this is still inside the
if CORESIGHT/endif block. (I think it is but I can't tell from just looking
at the patch itself.)

> help
> This driver provides support for coresight debugging module. This
> is primarily used to dump sample-based profiling registers when
> @@ -103,4 +127,7 @@ config CORESIGHT_CPU_DEBUG
> properly, please refer Documentation/trace/coresight-cpu-debug.txt
> for detailed description and the example for usage.
>
> + To compile this code as a module, choose M here: the
> + module will be called coresight-cpu-debug.
> +
> endif

> diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.h b/drivers/hwtracing/coresight/coresight-etm-perf.h
> index 3ffc9feb2d64..8c49c7b82d84 100644
> --- a/drivers/hwtracing/coresight/coresight-etm-perf.h
> +++ b/drivers/hwtracing/coresight/coresight-etm-perf.h
> @@ -54,7 +54,7 @@ struct etm_filters {
> };
>
>
> -#ifdef CONFIG_CORESIGHT
> +#if IS_ENABLED(CONFIG_CORESIGHT)

Have you found (observed) that this change (above) is necessary (and others
like it below)? I thought that they would be equivalent.

>From include/linux/kconfig.h:
/*
* IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
* 0 otherwise.
*/
#define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option))

> diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
> index f1d0e21d8cab..335bca44b42d 100644
> --- a/drivers/hwtracing/coresight/coresight-priv.h
> +++ b/drivers/hwtracing/coresight/coresight-priv.h

> @@ -143,7 +149,7 @@ struct list_head *coresight_build_path(struct coresight_device *csdev,
> struct coresight_device *sink);
> void coresight_release_path(struct list_head *path);
>
> -#ifdef CONFIG_CORESIGHT_SOURCE_ETM3X
> +#if IS_ENABLED(CONFIG_CORESIGHT_SOURCE_ETM3X)

ditto.

> extern int etm_readl_cp14(u32 off, unsigned int *val);
> extern int etm_writel_cp14(u32 off, u32 val);
> #else

> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index d950dad5056a..5863eb1a7335 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -243,7 +243,7 @@ struct coresight_ops {
> const struct coresight_ops_source *source_ops;
> };
>
> -#ifdef CONFIG_CORESIGHT
> +#if IS_ENABLED(CONFIG_CORESIGHT)

ditto.

thanks,
--
~Randy

Next message: Alex Williamson: "Re: [PATCH v4 04/14] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches"
Previous message: Long Li: "RE: [PATCH 1/7] cifs: smbd: Make upper layer decide when to destroy the transport"
In reply to: Kim Phillips: "[PATCH 3/4] coresight: allow to build as modules"
Next in thread: Kim Phillips: "Re: [PATCH 3/4] coresight: allow to build as modules"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]