[PATCH v2 15/20] coresight: cti: add function to register cti associate ops
Tingwei Zhang
tingwei at codeaurora.org
Tue Jul 14 01:49:09 EDT 2020
Add static cti_assoc_ops to coresight core driver. Let cti
driver register the add_assoc and remove_assoc call back.
Avoid coresight core driver to depend on cti driver.
Signed-off-by: Tingwei Zhang <tingwei at codeaurora.org>
---
drivers/hwtracing/coresight/coresight-cti.c | 32 ++++++++++++++++++--
drivers/hwtracing/coresight/coresight-priv.h | 14 ++++-----
drivers/hwtracing/coresight/coresight.c | 20 ++++++++++--
3 files changed, 53 insertions(+), 13 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c
index aa6e0249bd70..2829286daed9 100644
--- a/drivers/hwtracing/coresight/coresight-cti.c
+++ b/drivers/hwtracing/coresight/coresight-cti.c
@@ -504,7 +504,6 @@ void cti_add_assoc_to_csdev(struct coresight_device *csdev)
cti_add_done:
mutex_unlock(&ect_mutex);
}
-EXPORT_SYMBOL_GPL(cti_add_assoc_to_csdev);
/*
* Removing the associated devices is easier.
@@ -530,7 +529,15 @@ void cti_remove_assoc_from_csdev(struct coresight_device *csdev)
}
mutex_unlock(&ect_mutex);
}
-EXPORT_SYMBOL_GPL(cti_remove_assoc_from_csdev);
+
+/*
+ * Operations to add and remove associated CTI.
+ * Register to coresight core driver as call back function.
+ */
+static struct cti_assoc_op cti_assoc_ops = {
+ .add = cti_add_assoc_to_csdev,
+ .remove = cti_remove_assoc_from_csdev
+};
/*
* Update the cross references where the associated device was found
@@ -742,4 +749,23 @@ static struct amba_driver cti_driver = {
.probe = cti_probe,
.id_table = cti_ids,
};
-builtin_amba_driver(cti_driver);
+
+static int __init cti_init(void)
+{
+ int ret;
+
+ ret = amba_driver_register(&cti_driver);
+ if (ret)
+ pr_info("Error registering cti driver\n");
+ coresight_set_cti_ops(&cti_assoc_ops);
+ return ret;
+}
+
+static void __exit cti_exit(void)
+{
+ coresight_remove_cti_ops();
+ amba_driver_unregister(&cti_driver);
+}
+
+module_init(cti_init);
+module_exit(cti_exit);
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index 335ba2208b61..56d677473be4 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -162,15 +162,13 @@ static inline int etm_readl_cp14(u32 off, unsigned int *val) { return 0; }
static inline int etm_writel_cp14(u32 off, u32 val) { return 0; }
#endif
-#ifdef CONFIG_CORESIGHT_CTI
-extern void cti_add_assoc_to_csdev(struct coresight_device *csdev);
-extern void cti_remove_assoc_from_csdev(struct coresight_device *csdev);
+struct cti_assoc_op {
+ void (*add)(struct coresight_device *csdev);
+ void (*remove)(struct coresight_device *csdev);
+};
-#else
-static inline void cti_add_assoc_to_csdev(struct coresight_device *csdev) {}
-static inline void
-cti_remove_assoc_from_csdev(struct coresight_device *csdev) {}
-#endif
+extern void coresight_set_cti_ops(const struct cti_assoc_op *cti_op);
+extern void coresight_remove_cti_ops(void);
/*
* Macros and inline functions to handle CoreSight UCI data and driver
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index e8c4e10b75b5..bf8c41901016 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -57,6 +57,20 @@ const u32 coresight_barrier_pkt[4] = {
0x7fffffff, 0x7fffffff, 0x7fffffff, 0x7fffffff};
EXPORT_SYMBOL_GPL(coresight_barrier_pkt);
+static const struct cti_assoc_op *cti_assoc_ops;
+
+void coresight_set_cti_ops(const struct cti_assoc_op *cti_op)
+{
+ cti_assoc_ops = cti_op;
+}
+EXPORT_SYMBOL_GPL(coresight_set_cti_ops);
+
+void coresight_remove_cti_ops(void)
+{
+ cti_assoc_ops = NULL;
+}
+EXPORT_SYMBOL_GPL(coresight_remove_cti_ops);
+
static int coresight_id_match(struct device *dev, void *data)
{
int trace_id, i_trace_id;
@@ -1030,7 +1044,8 @@ static void coresight_device_release(struct device *dev)
{
struct coresight_device *csdev = to_coresight_device(dev);
- cti_remove_assoc_from_csdev(csdev);
+ if (cti_assoc_ops && cti_assoc_ops->remove)
+ cti_assoc_ops->remove(csdev);
fwnode_handle_put(csdev->dev.fwnode);
kfree(csdev->refcnt);
kfree(csdev);
@@ -1314,7 +1329,8 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
coresight_fixup_device_conns(csdev);
coresight_fixup_orphan_conns(csdev);
- cti_add_assoc_to_csdev(csdev);
+ if (cti_assoc_ops && cti_assoc_ops->add)
+ cti_assoc_ops->add(csdev);
mutex_unlock(&coresight_mutex);
--
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