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Date: Fri, 21 Aug 2020 11:44:34 +0800
From: Tingwei Zhang <tingwei@...eaurora.org>
To: Mathieu Poirier <mathieu.poirier@...aro.org>,
Suzuki K Poulose <suzuki.poulose@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Mike Leach <mike.leach@...aro.org>
Cc: Kim Phillips <kim.phillips@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Leo Yan <leo.yan@...aro.org>,
Randy Dunlap <rdunlap@...radead.org>,
Russell King <linux@...linux.org.uk>,
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,
Suzuki K Poulose <Suzuki.Poulose@....com>,
Tingwei Zhang <tingwei@...eaurora.org>
Subject: [PATCH v10 13/24] coresight: tmc: allow tmc to be built as a module
From: Kim Phillips <kim.phillips@....com>
Allow to build coresight-tmc 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-tmc by the Makefile
- add an tmc_remove function, for module unload
- add a MODULE_DEVICE_TABLE for autoloading on boot
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Leo Yan <leo.yan@...aro.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Suzuki K Poulose <Suzuki.Poulose@....com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Russell King <linux@...linux.org.uk>
Signed-off-by: Kim Phillips <kim.phillips@....com>
Signed-off-by: Tingwei Zhang <tingwei@...eaurora.org>
Tested-by: Mike Leach <mike.leach@...aro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
drivers/hwtracing/coresight/Kconfig | 6 ++++-
drivers/hwtracing/coresight/Makefile | 6 ++---
.../{coresight-tmc.c => coresight-tmc-core.c} | 25 ++++++++++++++++++-
3 files changed, 32 insertions(+), 5 deletions(-)
rename drivers/hwtracing/coresight/{coresight-tmc.c => coresight-tmc-core.c} (95%)
diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
index 8fd9887fb03b..fc48ae086746 100644
--- a/drivers/hwtracing/coresight/Kconfig
+++ b/drivers/hwtracing/coresight/Kconfig
@@ -25,7 +25,8 @@ config CORESIGHT_LINKS_AND_SINKS
entity at run time to form a complete trace path.
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.
@@ -34,6 +35,9 @@ config CORESIGHT_LINK_AND_SINK_TMC
complies with the generic implementation of the component without
special enhancement or added features.
+ To compile this driver as a module, choose M here: the
+ module will be called coresight-tmc.
+
config CORESIGHT_CATU
bool "Coresight Address Translation Unit (CATU) driver"
depends on CORESIGHT_LINK_AND_SINK_TMC
diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
index 271dc255454f..f2a568b969c4 100644
--- a/drivers/hwtracing/coresight/Makefile
+++ b/drivers/hwtracing/coresight/Makefile
@@ -4,9 +4,9 @@
#
obj-$(CONFIG_CORESIGHT) += coresight.o coresight-etm-perf.o \
coresight-platform.o coresight-sysfs.o
-obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o \
- coresight-tmc-etf.o \
- coresight-tmc-etr.o
+obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o
+coresight-tmc-y := coresight-tmc-core.o coresight-tmc-etf.o \
+ coresight-tmc-etr.o
obj-$(CONFIG_CORESIGHT_SINK_TPIU) += coresight-tpiu.o
obj-$(CONFIG_CORESIGHT_SINK_ETBV10) += coresight-etb10.o
obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o \
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc-core.c
similarity index 95%
rename from drivers/hwtracing/coresight/coresight-tmc.c
rename to drivers/hwtracing/coresight/coresight-tmc-core.c
index 7040d583bed9..c268fafb3f32 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-core.c
@@ -561,6 +561,21 @@ static void tmc_shutdown(struct amba_device *adev)
spin_unlock_irqrestore(&drvdata->spinlock, flags);
}
+static int __exit tmc_remove(struct amba_device *adev)
+{
+ struct tmc_drvdata *drvdata = dev_get_drvdata(&adev->dev);
+
+ /*
+ * Since misc_open() holds a refcount on the f_ops, which is
+ * etb fops in this case, device is there until last file
+ * handler to this device is closed.
+ */
+ misc_deregister(&drvdata->miscdev);
+ coresight_unregister(drvdata->csdev);
+
+ return 0;
+}
+
static const struct amba_id tmc_ids[] = {
CS_AMBA_ID(0x000bb961),
/* Coresight SoC 600 TMC-ETR/ETS */
@@ -572,6 +587,8 @@ static const struct amba_id tmc_ids[] = {
{ 0, 0},
};
+MODULE_DEVICE_TABLE(amba, tmc_ids);
+
static struct amba_driver tmc_driver = {
.drv = {
.name = "coresight-tmc",
@@ -580,6 +597,12 @@ static struct amba_driver tmc_driver = {
},
.probe = tmc_probe,
.shutdown = tmc_shutdown,
+ .remove = tmc_remove,
.id_table = tmc_ids,
};
-builtin_amba_driver(tmc_driver);
+
+module_amba_driver(tmc_driver);
+
+MODULE_AUTHOR("Pratik Patel <pratikp@...eaurora.org>");
+MODULE_DESCRIPTION("Arm CoreSight Trace Memory Controller driver");
+MODULE_LICENSE("GPL v2");
--
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