[SRU][N][PATCH 1/3] coresight: stm: Extract device name from AMBA pid based table lookup

[Noah Wager]

From: Anshuman Khandual <anshuman.khandual at arm.com>

BugLink: https://bugs.launchpad.net/bugs/2142337

Instead of using AMBA private data field, extract the device name from AMBA
pid based table lookup using new coresight_get_uci_data_from_amba() helper.

Cc: Suzuki K Poulose <suzuki.poulose at arm.com>
Cc: Mike Leach <mike.leach at linaro.org>
Cc: James Clark <james.clark at arm.com>
Cc: coresight at lists.linaro.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
Cc: linux-stm32 at st-md-mailman.stormreply.com
Reviewed-by: James Clark <james.clark at arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual at arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
Link: https://lore.kernel.org/r/20240314055843.2625883-3-anshuman.khandual@arm.com
(cherry picked from commit 852e9a32058a73702c016a8be10c60375276e46e)
Signed-off-by: Noah Wager <noah.wager at canonical.com>
---
 drivers/hwtracing/coresight/coresight-priv.h | 10 ++++++++++
 drivers/hwtracing/coresight/coresight-stm.c  | 12 +++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index b758a42ed8c7..f8f992f533c4 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -222,6 +222,16 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
 	return uci_id->data;
 }
 
+static inline void *coresight_get_uci_data_from_amba(const struct amba_id *table, u32 pid)
+{
+	while (table->mask) {
+		if ((pid & table->mask) == table->id)
+			return coresight_get_uci_data(table);
+		table++;
+	};
+	return NULL;
+}
+
 void coresight_release_platform_data(struct coresight_device *csdev,
 				     struct device *dev,
 				     struct coresight_platform_data *pdata);
diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index a1c27c901ad1..6737e7b5bfca 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -804,6 +804,16 @@ static void stm_init_generic_data(struct stm_drvdata *drvdata,
 	drvdata->stm.set_options = stm_generic_set_options;
 }
 
+static const struct amba_id stm_ids[];
+
+static char *stm_csdev_name(struct coresight_device *csdev)
+{
+	u32 stm_pid = coresight_get_pid(&csdev->access);
+	void *uci_data = coresight_get_uci_data_from_amba(stm_ids, stm_pid);
+
+	return uci_data ? (char *)uci_data : "STM";
+}
+
 static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 {
 	int ret, trace_id;
@@ -900,7 +910,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	pm_runtime_put(&adev->dev);
 
 	dev_info(&drvdata->csdev->dev, "%s initialized\n",
-		 (char *)coresight_get_uci_data(id));
+		 stm_csdev_name(drvdata->csdev));
 	return 0;
 
 cs_unregister:
-- 
2.43.0