linux-hardening - [RFC][PATCH v2 06/29] soc: qcom: smem: add minidump device

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Message-ID: <20250724135512.518487-7-eugen.hristev@linaro.org>
Date: Thu, 24 Jul 2025 16:54:49 +0300
From: Eugen Hristev <eugen.hristev@...aro.org>
To: linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arch@...r.kernel.org,
	linux-mm@...ck.org,
	tglx@...utronix.de,
	andersson@...nel.org,
	pmladek@...e.com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-hardening@...r.kernel.org,
	eugen.hristev@...aro.org,
	corbet@....net,
	mojha@....qualcomm.com,
	rostedt@...dmis.org,
	jonechou@...gle.com,
	tudor.ambarus@...aro.org
Subject: [RFC][PATCH v2 06/29] soc: qcom: smem: add minidump device

Add a minidump platform device.
Minidump can collect various memory snippets using dedicated firmware.
To know which snippets to collect, each snippet must be registered
by the kernel into a specific shared memory table which is controlled
by the qcom smem driver.
To instantiate the minidump platform driver, register its data using
platform_device_register_data.
Later on, the minidump driver will probe and register itself into
kmemdump as a backend

Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
---
 drivers/soc/qcom/smem.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index cf425930539e..2aae0e696150 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -270,6 +270,7 @@ struct smem_region {
  * @partitions: list of partitions of current processor/host
  * @item_count: max accepted item number
  * @socinfo:	platform device pointer
+ * @mdinfo:	minidump device pointer
  * @num_regions: number of @regions
  * @regions:	list of the memory regions defining the shared memory
  */
@@ -280,6 +281,7 @@ struct qcom_smem {
 
 	u32 item_count;
 	struct platform_device *socinfo;
+	struct platform_device *mdinfo;
 	struct smem_ptable *ptable;
 	struct smem_partition global_partition;
 	struct smem_partition partitions[SMEM_HOST_COUNT];
@@ -1236,12 +1238,20 @@ static int qcom_smem_probe(struct platform_device *pdev)
 	if (IS_ERR(smem->socinfo))
 		dev_dbg(&pdev->dev, "failed to register socinfo device\n");
 
+	smem->mdinfo = platform_device_register_data(&pdev->dev, "qcom-minidump",
+						     PLATFORM_DEVID_AUTO, NULL,
+						     0);
+	if (IS_ERR(smem->mdinfo))
+		dev_err(&pdev->dev, "failed to register platform md device\n");
+
 	return 0;
 }
 
 static void qcom_smem_remove(struct platform_device *pdev)
 {
 	platform_device_unregister(__smem->socinfo);
+	if (!IS_ERR(__smem->mdinfo))
+		platform_device_unregister(__smem->mdinfo);
 
 	hwspin_lock_free(__smem->hwlock);
 	__smem = NULL;
-- 
2.43.0