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Message-ID: <010101747b13452a-0775f7ad-9630-4f7e-9208-5a6fa46a6785-000000@us-west-2.amazonses.com>
Date: Fri, 11 Sep 2020 02:51:34 +0000
From: Tingwei Zhang <tingweiz@...eaurora.org>
To: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Tingwei Zhang <tingwei@...eaurora.org>,
Suzuki K Poulose <suzuki.poulose@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Mike Leach <mike.leach@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Leo Yan <leo.yan@...aro.org>,
Randy Dunlap <rdunlap@...radead.org>,
Russell King <linux@...linux.org.uk>,
Kim Phillips <kim.phillips@....com>,
Mian Yousaf Kaukab <ykaukab@...e.de>, tsoni@...eaurora.org,
Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
Mao Jinlong <jinlmao@...eaurora.org>,
coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 21/24] coresight: cti: allow cti to be built as a
module
On Fri, Sep 11, 2020 at 07:03:03AM +0800, Mathieu Poirier wrote:
> On Fri, Aug 21, 2020 at 11:44:42AM +0800, Tingwei Zhang wrote:
> > Allow to build coresight-cti 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-cti by the Makefile
> > - add an cti_remove function, for module unload
> > - move cti_remove_conn_xrefs to cti_remove
> > - add a MODULE_DEVICE_TABLE for autoloading on boot
> >
> > Signed-off-by: Tingwei Zhang <tingwei@...eaurora.org>
> > Tested-by: Mike Leach <mike.leach@...aro.org>
> > Reviewed-by Mike Leach <mike.leach@...aro.org>
> > ---
> > drivers/hwtracing/coresight/Kconfig | 5 ++++-
> > drivers/hwtracing/coresight/Makefile | 4 ++--
> > .../{coresight-cti.c => coresight-cti-core.c} | 20 ++++++++++++++++++-
> > .../hwtracing/coresight/coresight-platform.c | 1 +
> > drivers/hwtracing/coresight/coresight.c | 1 +
> > 5 files changed, 27 insertions(+), 4 deletions(-)
> > rename drivers/hwtracing/coresight/{coresight-cti.c =>
> coresight-cti-core.c} (98%)
> >
> > diff --git a/drivers/hwtracing/coresight/Kconfig
> b/drivers/hwtracing/coresight/Kconfig
> > index f31778dd0b5d..b04aae2ceecc 100644
> > --- a/drivers/hwtracing/coresight/Kconfig
> > +++ b/drivers/hwtracing/coresight/Kconfig
> > @@ -136,7 +136,7 @@ config CORESIGHT_CPU_DEBUG
> > module will be called coresight-cpu-debug.
> >
> > config CORESIGHT_CTI
> > - bool "CoreSight Cross Trigger Interface (CTI) driver"
> > + tristate "CoreSight Cross Trigger Interface (CTI) driver"
> > depends on ARM || ARM64
> > help
> > This driver provides support for CoreSight CTI and CTM
> components.
> > @@ -147,6 +147,9 @@ config CORESIGHT_CTI
> > halt compared to disabling sources and sinks normally in driver
> > software.
> >
> > + To compile this driver as a module, choose M here: the
> > + module will be called coresight-cti.
> > +
> > config CORESIGHT_CTI_INTEGRATION_REGS
> > bool "Access CTI CoreSight Integration Registers"
> > depends on CORESIGHT_CTI
> > diff --git a/drivers/hwtracing/coresight/Makefile
> b/drivers/hwtracing/coresight/Makefile
> > index f2a568b969c4..0359d5a1588f 100644
> > --- a/drivers/hwtracing/coresight/Makefile
> > +++ b/drivers/hwtracing/coresight/Makefile
> > @@ -19,6 +19,6 @@ 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-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o
> > -obj-$(CONFIG_CORESIGHT_CTI) += coresight-cti.o \
> > - coresight-cti-platform.o \
> > +obj-$(CONFIG_CORESIGHT_CTI) += coresight-cti.o
> > +coresight-cti-y := coresight-cti-core.o coresight-cti-platform.o \
> > coresight-cti-sysfs.o
> > diff --git a/drivers/hwtracing/coresight/coresight-cti.c
> b/drivers/hwtracing/coresight/coresight-cti-core.c
> > similarity index 98%
> > rename from drivers/hwtracing/coresight/coresight-cti.c
> > rename to drivers/hwtracing/coresight/coresight-cti-core.c
> > index ec286d617b73..d6d5419ec21c 100644
> > --- a/drivers/hwtracing/coresight/coresight-cti.c
> > +++ b/drivers/hwtracing/coresight/coresight-cti-core.c
> > @@ -838,7 +838,6 @@ static void cti_device_release(struct device *dev)
> > struct cti_drvdata *ect_item, *ect_tmp;
> >
> > mutex_lock(&ect_mutex);
> > - cti_remove_conn_xrefs(drvdata);
> > cti_pm_release(drvdata);
> >
> > /* remove from the list */
> > @@ -853,6 +852,18 @@ static void cti_device_release(struct device *dev)
> > if (drvdata->csdev_release)
> > drvdata->csdev_release(dev);
> > }
> > +static int __exit cti_remove(struct amba_device *adev)
> > +{
> > + struct cti_drvdata *drvdata = dev_get_drvdata(&adev->dev);
> > +
> > + mutex_lock(&ect_mutex);
> > + cti_remove_conn_xrefs(drvdata);
> > + mutex_unlock(&ect_mutex);
> > +
> > + coresight_unregister(drvdata->csdev);
> > +
> > + return 0;
>
> Once again my recommendations from V8 were not followed.
>
Sorry for missing your comment. I'll add reason for above change
in commit message in V11.
Thanks,
Tingwei
> > +}
> >
> > static int cti_probe(struct amba_device *adev, const struct amba_id
> *id)
> > {
> > @@ -973,6 +984,8 @@ static const struct amba_id cti_ids[] = {
> > { 0, 0},
> > };
> >
> > +MODULE_DEVICE_TABLE(amba, cti_ids);
> > +
> > static struct amba_driver cti_driver = {
> > .drv = {
> > .name = "coresight-cti",
> > @@ -980,6 +993,7 @@ static struct amba_driver cti_driver = {
> > .suppress_bind_attrs = true,
> > },
> > .probe = cti_probe,
> > + .remove = cti_remove,
> > .id_table = cti_ids,
> > };
> >
> > @@ -1002,3 +1016,7 @@ static void __exit cti_exit(void)
> >
> > module_init(cti_init);
> > module_exit(cti_exit);
> > +
> > +MODULE_AUTHOR("Mike Leach <mike.leach@...aro.org>");
> > +MODULE_DESCRIPTION("Arm CoreSight CTI Driver");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/drivers/hwtracing/coresight/coresight-platform.c
> b/drivers/hwtracing/coresight/coresight-platform.c
> > index 227e234a2470..3629b7885aca 100644
> > --- a/drivers/hwtracing/coresight/coresight-platform.c
> > +++ b/drivers/hwtracing/coresight/coresight-platform.c
> > @@ -75,6 +75,7 @@ coresight_find_csdev_by_fwnode(struct fwnode_handle
> *r_fwnode)
> > }
> > return csdev;
> > }
> > +EXPORT_SYMBOL_GPL(coresight_find_csdev_by_fwnode);
> >
> > #ifdef CONFIG_OF
> > static inline bool of_coresight_legacy_ep_is_input(struct device_node
> *ep)
> > diff --git a/drivers/hwtracing/coresight/coresight.c
> b/drivers/hwtracing/coresight/coresight.c
> > index 6c9f6930b8b8..668963b4b7d4 100644
> > --- a/drivers/hwtracing/coresight/coresight.c
> > +++ b/drivers/hwtracing/coresight/coresight.c
> > @@ -288,6 +288,7 @@ void coresight_set_assoc_ectdev_mutex(struct
> coresight_device *csdev,
> > csdev->ect_dev = ect_csdev;
> > mutex_unlock(&coresight_mutex);
> > }
> > +EXPORT_SYMBOL_GPL(coresight_set_assoc_ectdev_mutex);
> >
> > static int coresight_enable_sink(struct coresight_device *csdev,
> > u32 mode, void *data)
> > --
> > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
> Forum,
> > a Linux Foundation Collaborative Project
> >
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