[PATCH V3] remoteproc: qcom: pas: Adjust the phys addr wrt the mem region

[Yogesh Lal <quic_ylal@xxxxxxxxxxx>]

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@xxxxxxxxxxx>
Reviewed-by: Sibi Sankar <quic_sibis@xxxxxxxxxxx>
---
 drivers/remoteproc/qcom_common.c   | 13 +++++++++----
 drivers/remoteproc/qcom_common.h   |  5 ++++-
 drivers/remoteproc/qcom_q6v5_pas.c | 20 +++++++++++++++++++-
 3 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
index 4b91e3c..db8d72e 100644
--- a/drivers/remoteproc/qcom_common.c
+++ b/drivers/remoteproc/qcom_common.c
@@ -101,7 +101,9 @@ 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,
+			void (*rproc_dumpfn_t)(struct rproc *rproc, struct rproc_dump_segment *segment,
+				void *dest, size_t offset, size_t size))
 {
 	struct minidump_region __iomem *ptr;
 	struct minidump_region region;
@@ -131,7 +133,7 @@ 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, rproc_dumpfn_t, name);
 		}
 	}
 
@@ -139,7 +141,10 @@ 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,
+		void (*rproc_dumpfn_t)(struct rproc *rproc,
+		struct rproc_dump_segment *segment, void *dest, size_t offset,
+		size_t size))
 {
 	int ret;
 	struct minidump_subsystem *subsystem;
@@ -169,7 +174,7 @@ void qcom_minidump(struct rproc *rproc, unsigned int minidump_id)
 		return;
 	}
 
-	ret = qcom_add_minidump_segments(rproc, subsystem);
+	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);
 		goto clean_minidump;
diff --git a/drivers/remoteproc/qcom_common.h b/drivers/remoteproc/qcom_common.h
index c35adf7..c3cc619 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);
+void qcom_minidump(struct rproc *rproc, unsigned int minidump_id,
+			void (*rproc_dumpfn_t)(struct rproc *rproc,
+				struct rproc_dump_segment *segment, void *dest, size_t offset,
+				size_t size));
 
 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 401b1ec..785e2d1 100644
--- a/drivers/remoteproc/qcom_q6v5_pas.c
+++ b/drivers/remoteproc/qcom_q6v5_pas.c
@@ -83,11 +83,29 @@ 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