[PATCH 24/26] soc: qcom: smem: Add minidump device

Eugen Hristev
2025-11-19T15:46:00Z

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 obtain the required memory
snippets from the memory inspection table (meminspect)

Signed-off-by: Eugen Hristev <eugen.hristev@linaro.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 c4c45f15dca4..03315722d71a 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