[PATCH v6 10/25] coresight: etm4x: allow etm4x to be built as a module
Mike Leach
mike.leach at linaro.org
Mon Aug 3 13:11:01 EDT 2020
On Fri, 31 Jul 2020 at 07:41, Tingwei Zhang <tingwei at codeaurora.org> wrote:
>
> From: Kim Phillips <kim.phillips at arm.com>
>
> Allow to build coresight-etm4x as a module, for ease of development.
>
> - Kconfig becomes a tristate, to allow =m
> - append -core to source file name to allow module to
> be called coresight-etm4x by the Makefile
> - add an etm4_remove function, for module unload
> - add a MODULE_DEVICE_TABLE for autoloading on boot
>
> Cc: Mathieu Poirier <mathieu.poirier at linaro.org>
> Cc: Leo Yan <leo.yan at linaro.org>
> Cc: Alexander Shishkin <alexander.shishkin at linux.intel.com>
> Cc: Randy Dunlap <rdunlap at infradead.org>
> Cc: Suzuki K Poulose <Suzuki.Poulose at arm.com>
> Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
> Cc: Russell King <linux at armlinux.org.uk>
> Signed-off-by: Kim Phillips <kim.phillips at arm.com>
> Signed-off-by: Tingwei Zhang <tingwei at codeaurora.org>
> ---
> drivers/hwtracing/coresight/Kconfig | 5 +++-
> drivers/hwtracing/coresight/Makefile | 4 +--
> ...resight-etm4x.c => coresight-etm4x-core.c} | 26 ++++++++++++++++++-
> 3 files changed, 31 insertions(+), 4 deletions(-)
> rename drivers/hwtracing/coresight/{coresight-etm4x.c => coresight-etm4x-core.c} (98%)
>
> diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
> index 8fd9fd139cf3..d6e107bbd30b 100644
> --- a/drivers/hwtracing/coresight/Kconfig
> +++ b/drivers/hwtracing/coresight/Kconfig
> @@ -78,7 +78,7 @@ config CORESIGHT_SOURCE_ETM3X
> module will be called coresight-etm3x.
>
> config CORESIGHT_SOURCE_ETM4X
> - bool "CoreSight Embedded Trace Macrocell 4.x driver"
> + tristate "CoreSight Embedded Trace Macrocell 4.x driver"
> depends on ARM64
> select CORESIGHT_LINKS_AND_SINKS
> select PID_IN_CONTEXTIDR
> @@ -88,6 +88,9 @@ config CORESIGHT_SOURCE_ETM4X
> for instruction level tracing. Depending on the implemented version
> data tracing may also be available.
>
> + To compile this driver as a module, choose M here: the
> + module will be called coresight-etm4x.
> +
> config CORESIGHT_STM
> tristate "CoreSight System Trace Macrocell driver"
> depends on (ARM && !(CPU_32v3 || CPU_32v4 || CPU_32v4T)) || ARM64
> diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
> index d619cfd0abd8..271dc255454f 100644
> --- a/drivers/hwtracing/coresight/Makefile
> +++ b/drivers/hwtracing/coresight/Makefile
> @@ -14,8 +14,8 @@ obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o \
> obj-$(CONFIG_CORESIGHT_SOURCE_ETM3X) += coresight-etm3x.o
> coresight-etm3x-y := coresight-etm3x-core.o coresight-etm-cp14.o \
> coresight-etm3x-sysfs.o
> -obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x.o \
> - coresight-etm4x-sysfs.o
> +obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x.o
> +coresight-etm4x-y := coresight-etm4x-core.o coresight-etm4x-sysfs.o
> obj-$(CONFIG_CORESIGHT_STM) += coresight-stm.o
> obj-$(CONFIG_CORESIGHT_CPU_DEBUG) += coresight-cpu-debug.o
> obj-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> similarity index 98%
> rename from drivers/hwtracing/coresight/coresight-etm4x.c
> rename to drivers/hwtracing/coresight/coresight-etm4x-core.c
> index 6d7d2169bfb2..8149853d5e9d 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -1573,6 +1573,21 @@ static struct amba_cs_uci_id uci_id_etm4[] = {
> }
> };
>
> +static int __exit etm4_remove(struct amba_device *adev)
> +{
> + struct etmv4_drvdata *drvdata = dev_get_drvdata(&adev->dev);
> +
> + etm_perf_symlink(drvdata->csdev, false);
> +
> + etmdrvdata[drvdata->cpu] = NULL;
> + etm4_pm_clear();
> +
> + coresight_unregister(drvdata->csdev);
> +
> + return 0;
> +}
> +
> +
> static const struct amba_id etm4_ids[] = {
> CS_AMBA_ID(0x000bb95d), /* Cortex-A53 */
> CS_AMBA_ID(0x000bb95e), /* Cortex-A57 */
> @@ -1590,12 +1605,21 @@ static const struct amba_id etm4_ids[] = {
> {},
> };
>
> +MODULE_DEVICE_TABLE(amba, etm4_ids);
> +
> static struct amba_driver etm4x_driver = {
> .drv = {
> .name = "coresight-etm4x",
> + .owner = THIS_MODULE,
> .suppress_bind_attrs = true,
> },
> .probe = etm4_probe,
> + .remove = etm4_remove,
> .id_table = etm4_ids,
> };
> -builtin_amba_driver(etm4x_driver);
> +module_amba_driver(etm4x_driver);
> +
> +MODULE_AUTHOR("Pratik Patel <pratikp at codeaurora.org>");
> +MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier at linaro.org>");
> +MODULE_DESCRIPTION("Arm CoreSight Program Flow Trace v4 driver");
> +MODULE_LICENSE("GPL v2");
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
Tested by: Mike Leach <mike.leach at linaro.org>
--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK
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