linux-kernel - [RFC][PATCH 10/10] rng: qcom_rng: EXAMPLE: registering dev structure

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Message-ID: <20250217101706.2104498-11-eugen.hristev@linaro.org>
Date: Mon, 17 Feb 2025 12:17:06 +0200
From: Eugen Hristev <eugen.hristev@...aro.org>
To: linux-arm-msm@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	kees@...nel.org
Cc: linux-kernel@...r.kernel.org,
	johannes@...solutions.net,
	gregkh@...uxfoundation.org,
	rafael@...nel.org,
	dakr@...nel.org,
	andersson@...nel.org,
	konradybcio@...nel.org,
	tony.luck@...el.com,
	gpiccoli@...lia.com,
	pmladek@...e.com,
	rostedt@...dmis.org,
	john.ogness@...utronix.de,
	senozhatsky@...omium.org,
	quic_mojha@...cinc.com,
	linux-arm-kernel@...ts.infradead.org,
	kernel@...cinc.com,
	Eugen Hristev <eugen.hristev@...aro.org>
Subject: [RFC][PATCH 10/10] rng: qcom_rng: EXAMPLE: registering dev structure

Proof of concept on how devcd register core area works.

Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
---
 drivers/crypto/qcom-rng.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/crypto/qcom-rng.c b/drivers/crypto/qcom-rng.c
index 0685ba122e8a..a1509609f50c 100644
--- a/drivers/crypto/qcom-rng.c
+++ b/drivers/crypto/qcom-rng.c
@@ -7,6 +7,7 @@
 #include <linux/acpi.h>
 #include <linux/clk.h>
 #include <linux/crypto.h>
+#include <linux/devcoredump.h>
 #include <linux/hw_random.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
@@ -32,11 +33,13 @@
 #define QCOM_TRNG_QUALITY	1024
 
 struct qcom_rng {
+	char start[10];
 	struct mutex lock;
 	void __iomem *base;
 	struct clk *clk;
 	struct hwrng hwrng;
 	struct qcom_rng_match_data *match_data;
+	char end[10];
 };
 
 struct qcom_rng_ctx {
@@ -192,6 +195,10 @@ static int qcom_rng_probe(struct platform_device *pdev)
 	if (IS_ERR(rng->base))
 		return PTR_ERR(rng->base);
 
+	/* Setting some markers to easily recognize them afterwards */
+	strcpy(rng->start, "MD_RNG_ST");
+	strcpy(rng->end, "MD_RNG_en");
+
 	rng->clk = devm_clk_get_optional(&pdev->dev, "core");
 	if (IS_ERR(rng->clk))
 		return PTR_ERR(rng->clk);
@@ -218,6 +225,8 @@ static int qcom_rng_probe(struct platform_device *pdev)
 		}
 	}
 
+	devcd_register_core_area(&pdev->dev, rng, sizeof(*rng));
+
 	return ret;
 fail:
 	crypto_unregister_rng(&qcom_rng_alg);
@@ -228,6 +237,8 @@ static void qcom_rng_remove(struct platform_device *pdev)
 {
 	crypto_unregister_rng(&qcom_rng_alg);
 
+	devcd_unregister_core_area(&pdev->dev, qcom_rng_dev,
+				   sizeof(*qcom_rng_dev));
 	qcom_rng_dev = NULL;
 }
 
-- 
2.43.0