Subject: [PATCH v2 14/20] coresight: allow funnel and replicator drivers to be built as modules

From: Tingwei Zhang <[email-masked]>
Date: Tue, 14 Jul 2020 13:49:08 +0800

From: Kim Phillips <[email-masked]>

Allow to build coresight-funnel and coresight-replicator as modules,
for ease of development.

- Kconfig becomes a tristate, to allow =m
- add funnel_remove and replicator_remove functions,
  for module unload
- add a MODULE_DEVICE_TABLE for autoloading on boot

Cc: Mathieu Poirier <[email-masked]>
Cc: Leo Yan <[email-masked]>
Cc: Alexander Shishkin <[email-masked]>
Cc: Randy Dunlap <[email-masked]>
Cc: Suzuki K Poulose <[email-masked]>
Cc: Greg Kroah-Hartman <[email-masked]>
Cc: Russell King <[email-masked]>
Signed-off-by: Kim Phillips <[email-masked]>
Signed-off-by: Tingwei Zhang <[email-masked]>
---
 drivers/hwtracing/coresight/Kconfig           |  5 ++-
 .../hwtracing/coresight/coresight-funnel.c    | 31 +++++++++++++++++
 .../coresight/coresight-replicator.c          | 33 +++++++++++++++++++
 3 files changed, 68 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
index fc48ae086746..f31778dd0b5d 100644
--- a/drivers/hwtracing/coresight/Kconfig
+++ b/drivers/hwtracing/coresight/Kconfig
@@ -17,13 +17,16 @@ menuconfig CORESIGHT
 
 if CORESIGHT
 config CORESIGHT_LINKS_AND_SINKS
-	bool "CoreSight Link and Sink drivers"
+	tristate "CoreSight Link and Sink drivers"
 	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 these drivers as modules, choose M here: the
+	  modules will be called coresight-funnel and coresight-replicator.
+
 config CORESIGHT_LINK_AND_SINK_TMC
 	tristate "Coresight generic TMC driver"
 
diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
index 594711c757fe..062694ef9879 100644
--- a/drivers/hwtracing/coresight/coresight-funnel.c
+++ b/drivers/hwtracing/coresight/coresight-funnel.c
@@ -274,6 +274,15 @@ static int funnel_probe(struct device *dev, struct resource *res)
 	return ret;
 }
 
+static int __exit funnel_remove(struct device *dev)
+{
+	struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
+
+	coresight_unregister(drvdata->csdev);
+
+	return 0;
+}
+
 #ifdef CONFIG_PM
 static int funnel_runtime_suspend(struct device *dev)
 {
@@ -319,20 +328,31 @@ static int static_funnel_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static int __exit static_funnel_remove(struct platform_device *pdev)
+{
+	funnel_remove(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	return 0;
+}
+
 static const struct of_device_id static_funnel_match[] = {
 	{.compatible = "arm,coresight-static-funnel"},
 	{}
 };
 
+MODULE_DEVICE_TABLE(of, static_funnel_match);
+
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id static_funnel_ids[] = {
 	{"ARMHC9FE", 0},
 	{},
 };
+MODULE_DEVICE_TABLE(acpi, static_funnel_ids);
 #endif
 
 static struct platform_driver static_funnel_driver = {
 	.probe          = static_funnel_probe,
+	.probe          = static_funnel_remove,
 	.driver         = {
 		.name   = "coresight-static-funnel",
 		.of_match_table = static_funnel_match,
@@ -348,6 +368,11 @@ static int dynamic_funnel_probe(struct amba_device *adev,
 	return funnel_probe(&adev->dev, &adev->res);
 }
 
+static int __exit dynamic_funnel_remove(struct amba_device *adev)
+{
+	return funnel_remove(&adev->dev);
+}
+
 static const struct amba_id dynamic_funnel_ids[] = {
 	{
 		.id     = 0x000bb908,
@@ -361,6 +386,8 @@ static const struct amba_id dynamic_funnel_ids[] = {
 	{ 0, 0},
 };
 
+MODULE_DEVICE_TABLE(amba, dynamic_funnel_ids);
+
 static struct amba_driver dynamic_funnel_driver = {
 	.drv = {
 		.name	= "coresight-dynamic-funnel",
@@ -369,6 +396,7 @@ static struct amba_driver dynamic_funnel_driver = {
 		.suppress_bind_attrs = true,
 	},
 	.probe		= dynamic_funnel_probe,
+	.remove		= dynamic_funnel_remove,
 	.id_table	= dynamic_funnel_ids,
 };
 
@@ -400,3 +428,6 @@ static void __exit funnel_exit(void)
 module_init(funnel_init);
 module_exit(funnel_exit);
 
+MODULE_AUTHOR("Mathieu Poirier <[email-masked]>");
+MODULE_DESCRIPTION("Arm CoreSight Funnel Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index 32ee3497d018..463a99dec778 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -270,6 +270,14 @@ static int replicator_probe(struct device *dev, struct resource *res)
 	return ret;
 }
 
+static int __exit replicator_remove(struct device *dev)
+{
+	struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
+
+	coresight_unregister(drvdata->csdev);
+	return 0;
+}
+
 static int static_replicator_probe(struct platform_device *pdev)
 {
 	int ret;
@@ -289,6 +297,13 @@ static int static_replicator_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static int __exit static_replicator_remove(struct platform_device *pdev)
+{
+	replicator_remove(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	return 0;
+}
+
 #ifdef CONFIG_PM
 static int replicator_runtime_suspend(struct device *dev)
 {
@@ -321,18 +336,22 @@ static const struct of_device_id static_replicator_match[] = {
 	{.compatible = "arm,coresight-static-replicator"},
 	{}
 };
+MODULE_DEVICE_TABLE(of, static_replicator_match);
 
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id static_replicator_acpi_ids[] = {
 	{"ARMHC985", 0}, /* ARM CoreSight Static Replicator */
 	{}
 };
+MODULE_DEVICE_TABLE(acpi, static_replicator_acpi_ids);
 #endif
 
 static struct platform_driver static_replicator_driver = {
 	.probe          = static_replicator_probe,
+	.remove         = static_replicator_remove,
 	.driver         = {
 		.name   = "coresight-static-replicator",
+		.owner	= THIS_MODULE,
 		.of_match_table = of_match_ptr(static_replicator_match),
 		.acpi_match_table = ACPI_PTR(static_replicator_acpi_ids),
 		.pm	= &replicator_dev_pm_ops,
@@ -346,6 +365,11 @@ static int dynamic_replicator_probe(struct amba_device *adev,
 	return replicator_probe(&adev->dev, &adev->res);
 }
 
+static int __exit dynamic_replicator_remove(struct amba_device *adev)
+{
+	return replicator_remove(&adev->dev);
+}
+
 static const struct amba_id dynamic_replicator_ids[] = {
 	{
 		.id     = 0x000bb909,
@@ -359,13 +383,17 @@ static const struct amba_id dynamic_replicator_ids[] = {
 	{ 0, 0 },
 };
 
+MODULE_DEVICE_TABLE(amba, dynamic_replicator_ids);
+
 static struct amba_driver dynamic_replicator_driver = {
 	.drv = {
 		.name	= "coresight-dynamic-replicator",
 		.pm	= &replicator_dev_pm_ops,
+		.owner	= THIS_MODULE,
 		.suppress_bind_attrs = true,
 	},
 	.probe		= dynamic_replicator_probe,
+	.remove         = dynamic_replicator_remove,
 	.id_table	= dynamic_replicator_ids,
 };
 
@@ -396,3 +424,8 @@ static void __exit replicator_exit(void)
 
 module_init(replicator_init);
 module_exit(replicator_exit);
+
+MODULE_AUTHOR("Pratik Patel <[email-masked]>");
+MODULE_AUTHOR("Mathieu Poirier <[email-masked]>");
+MODULE_DESCRIPTION("Arm CoreSight Replicator Driver");
+MODULE_LICENSE("GPL v2");
-- 
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a Linux Foundation Collaborative Project

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