linux-kernel - [PATCH v4 2/2] remoteproc: qcom: Add full coredump fallback mechanism

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Date:   Fri, 24 Feb 2023 11:57:31 -0800
From:   Gokul krishna Krishnakumar <quic_gokukris@...cinc.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
CC:     Trilok Soni <quic_tsoni@...cinc.com>,
        Satya Durga Srinivasu Prabhala <quic_satyap@...cinc.com>,
        Rajendra Nayak <quic_rjendra@...cinc.com>,
        "Elliot Berman" <quic_eberman@...cinc.com>,
        Guru Das Srinagesh <quic_gurus@...cinc.com>,
        Sibi Sankar <quic_sibis@...cinc.com>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>,
        Siddharth Gupta <sidgup@...eaurora.org>,
        Gokul krishna Krishnakumar <quic_gokukris@...cinc.com>
Subject: [PATCH v4 2/2] remoteproc: qcom: Add full coredump fallback mechanism

From: Siddharth Gupta <sidgup@...eaurora.org>

If a remoteproc's firmware does not support minidump but the driver
adds an ID, the minidump driver does not collect any coredumps when
the remoteproc crashes. This hinders the purpose of coredump
collection. This change adds a fallback mechanism in the event of a
crash.

Signed-off-by: Siddharth Gupta <sidgup@...eaurora.org>
Signed-off-by: Gokul krishna Krishnakumar <quic_gokukris@...cinc.com>
---
 drivers/remoteproc/qcom_common.c   | 13 +++++++++++--
 drivers/remoteproc/qcom_q6v5_pas.c |  1 +
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
index 7da3259be14a..280a5a821dca 100644
--- a/drivers/remoteproc/qcom_common.c
+++ b/drivers/remoteproc/qcom_common.c
@@ -173,12 +173,21 @@ void qcom_minidump(struct rproc *rproc, unsigned int minidump_id,
 	 */
 	if (subsystem->regions_baseptr == 0 ||
 	    le32_to_cpu(subsystem->status) != 1 ||
-	    le32_to_cpu(subsystem->enabled) != MD_SS_ENABLED ||
-	    le32_to_cpu(subsystem->encryption_status) != MD_SS_ENCR_DONE) {
+	    le32_to_cpu(subsystem->enabled) != MD_SS_ENABLED) {
+		return rproc_coredump(rproc);
+	}
+
+	if (le32_to_cpu(subsystem->encryption_status) != MD_SS_ENCR_DONE) {
 		dev_err(&rproc->dev, "Minidump not ready, skipping\n");
 		return;
 	}
 
+	/**
+	 * Clear out the dump segments populated by parse_fw before
+	 * re-populating them with minidump segments.
+	 */
+	rproc_coredump_cleanup(rproc);
+
 	ret = qcom_add_minidump_segments(rproc, subsystem, rproc_dumpfn_t);
 	if (ret) {
 		dev_err(&rproc->dev, "Failed with error: %d while adding minidump entries\n", ret);
diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
index 27d3a6f8c92f..d065f99b4c32 100644
--- a/drivers/remoteproc/qcom_q6v5_pas.c
+++ b/drivers/remoteproc/qcom_q6v5_pas.c
@@ -442,6 +442,7 @@ static const struct rproc_ops adsp_minidump_ops = {
 	.start = adsp_start,
 	.stop = adsp_stop,
 	.da_to_va = adsp_da_to_va,
+	.parse_fw = qcom_register_dump_segments,
 	.load = adsp_load,
 	.panic = adsp_panic,
 	.coredump = adsp_minidump,
-- 
2.39.2