[RFC][PATCH v3 07/16] soc: qcom: smem: Add minidump device
From: Eugen Hristev <hidden>
Date: 2025-09-12 15:10:27
Also in:
linux-arm-kernel, linux-arm-msm, linux-devicetree, linux-hardening, linux-mm, lkml
Subsystem:
arm/qualcomm mailing list, arm/qualcomm support, the rest · Maintainers:
Bjorn Andersson, Konrad Dybcio, Linus Torvalds
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 <redacted> --- 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