linux-kernel - [PATCH] remoteproc: qcom: pas: Adjust the phys addr wrt the mem region

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Date:   Fri, 3 Jun 2022 01:30:07 +0530
From:   Yogesh Lal <quic_ylal@...cinc.com>
To:     <bjorn.andersson@...aro.org>, <quic_sibis@...cinc.com>
CC:     <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Yogesh Lal <quic_ylal@...cinc.com>
Subject: [PATCH] remoteproc: qcom: pas: Adjust the phys addr wrt the mem region

The minidump table in the toc contains physical addresses that may lie
before the physical address of the first elf segment in relocatable
images. This change adds a custom dump function for minidumps which
calculates the offset into the carveout region using the start of
the physical address instead of the start of the first elf segment.

Signed-off-by: Yogesh Lal <quic_ylal@...cinc.com>
---
 drivers/remoteproc/qcom_common.c   |  9 +++++----
 drivers/remoteproc/qcom_common.h   |  5 ++++-
 drivers/remoteproc/qcom_q6v5_pas.c | 21 ++++++++++++++++++++-
 3 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
index 246e716..503326b 100644
--- a/drivers/remoteproc/qcom_common.c
+++ b/drivers/remoteproc/qcom_common.c
@@ -101,7 +101,8 @@ static void qcom_minidump_cleanup(struct rproc *rproc)
 	}
 }
 
-static int qcom_add_minidump_segments(struct rproc *rproc, struct minidump_subsystem *subsystem)
+static int qcom_add_minidump_segments(struct rproc *rproc, struct minidump_subsystem *subsystem,
+									rproc_dumpfn_t dumpfn)
 {
 	struct minidump_region __iomem *ptr;
 	struct minidump_region region;
@@ -131,7 +132,7 @@ static int qcom_add_minidump_segments(struct rproc *rproc, struct minidump_subsy
 			}
 			da = le64_to_cpu(region.address);
 			size = le32_to_cpu(region.size);
-			rproc_coredump_add_custom_segment(rproc, da, size, NULL, name);
+			rproc_coredump_add_custom_segment(rproc, da, size, dumpfn, name);
 		}
 	}
 
@@ -139,7 +140,7 @@ static int qcom_add_minidump_segments(struct rproc *rproc, struct minidump_subsy
 	return 0;
 }
 
-void qcom_minidump(struct rproc *rproc, unsigned int minidump_id)
+void qcom_minidump(struct rproc *rproc, unsigned int minidump_id, rproc_dumpfn_t dumpfn)
 {
 	int ret;
 	struct minidump_subsystem *subsystem;
@@ -179,7 +180,7 @@ void qcom_minidump(struct rproc *rproc, unsigned int minidump_id)
 
 	rproc_coredump_cleanup(rproc);
 
-	ret = qcom_add_minidump_segments(rproc, subsystem);
+	ret = qcom_add_minidump_segments(rproc, subsystem, dumpfn);
 	if (ret) {
 		dev_err(&rproc->dev, "Failed with error: %d while adding minidump entries\n", ret);
 		goto clean_minidump;
diff --git a/drivers/remoteproc/qcom_common.h b/drivers/remoteproc/qcom_common.h
index c35adf7..29e528b 100644
--- a/drivers/remoteproc/qcom_common.h
+++ b/drivers/remoteproc/qcom_common.h
@@ -33,7 +33,10 @@ struct qcom_rproc_ssr {
 	struct qcom_ssr_subsystem *info;
 };
 
-void qcom_minidump(struct rproc *rproc, unsigned int minidump_id);
+typedef void (*rproc_dumpfn_t)(struct rproc *rproc, struct rproc_dump_segment *segment,
+			void *dest, size_t offset, size_t size);
+
+void qcom_minidump(struct rproc *rproc, unsigned int minidump_id, rproc_dumpfn_t dumpfn);
 
 void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
 			   const char *ssr_name);
diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
index 6e5cbca..9c6cb0b 100644
--- a/drivers/remoteproc/qcom_q6v5_pas.c
+++ b/drivers/remoteproc/qcom_q6v5_pas.c
@@ -83,11 +83,30 @@ struct qcom_adsp {
 	struct qcom_sysmon *sysmon;
 };
 
+void adsp_segment_dump(struct rproc *rproc, struct rproc_dump_segment *segment,
+						void *dest, size_t offset, size_t size)
+{
+	struct qcom_adsp *adsp = rproc->priv;
+	int total_offset;
+
+	total_offset = segment->da + segment->offset + offset - adsp->mem_phys;
+	if (total_offset < 0 || total_offset + size > adsp->mem_size) {
+		dev_err(adsp->dev,
+			"invalid copy request for segment %pad with offset %zu and size %zu)\n",
+			&segment->da, offset, size);
+		memset(dest, 0xff, size);
+		return;
+	}
+
+	memcpy_fromio(dest, adsp->mem_region + total_offset, size);
+}
+
+
 static void adsp_minidump(struct rproc *rproc)
 {
 	struct qcom_adsp *adsp = rproc->priv;
 
-	qcom_minidump(rproc, adsp->minidump_id);
+	qcom_minidump(rproc, adsp->minidump_id, adsp_segment_dump);
 }
 
 static int adsp_pds_enable(struct qcom_adsp *adsp, struct device **pds,
-- 
2.7.4