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[82.11.253.99]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4587054e37dsm20889375e9.14.2025.07.24.06.56.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Jul 2025 06:56:27 -0700 (PDT) From: Eugen Hristev To: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, tglx@linutronix.de, andersson@kernel.org, pmladek@suse.com Cc: linux-arm-kernel@lists.infradead.org, linux-hardening@vger.kernel.org, eugen.hristev@linaro.org, corbet@lwn.net, mojha@qti.qualcomm.com, rostedt@goodmis.org, jonechou@google.com, tudor.ambarus@linaro.org Subject: [RFC][PATCH v2 06/29] soc: qcom: smem: add minidump device Date: Thu, 24 Jul 2025 16:54:49 +0300 Message-ID: <20250724135512.518487-7-eugen.hristev@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250724135512.518487-1-eugen.hristev@linaro.org> References: <20250724135512.518487-1-eugen.hristev@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- 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 { =20 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"); =20 + smem->mdinfo =3D 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; } =20 static void qcom_smem_remove(struct platform_device *pdev) { platform_device_unregister(__smem->socinfo); + if (!IS_ERR(__smem->mdinfo)) + platform_device_unregister(__smem->mdinfo); =20 hwspin_lock_free(__smem->hwlock); __smem =3D NULL; --=20 2.43.0