remoteproc: qcom: q6v5-mss: Add custom dump function for modem

The per segment dump function is responsible for loading the mba
before device memory segments associated with coredump can be populated
and for cleaning up the resources post coredump.

Signed-off-by: Sibi Sankar <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>

drivers/remoteproc/qcom_q6v5_mss.c

···
 	bool running;
 
 	bool dump_mba_loaded;
+	unsigned long dump_segment_mask;
+	unsigned long dump_complete_mask;
+
 	phys_addr_t mba_phys;
 	void *mba_region;
 	size_t mba_size;
···
 	return ret < 0 ? ret : 0;
 }
 
+static void qcom_q6v5_dump_segment(struct rproc *rproc,
+				   struct rproc_dump_segment *segment,
+				   void *dest)
+{
+	int ret = 0;
+	struct q6v5 *qproc = rproc->priv;
+	unsigned long mask = BIT((unsigned long)segment->priv);
+	void *ptr = rproc_da_to_va(rproc, segment->da, segment->size);
+
+	/* Unlock mba before copying segments */
+	if (!qproc->dump_mba_loaded)
+		ret = q6v5_mba_load(qproc);
+
+	if (!ptr || ret)
+		memset(dest, 0xff, segment->size);
+	else
+		memcpy(dest, ptr, segment->size);
+
+	qproc->dump_segment_mask |= mask;
+
+	/* Reclaim mba after copying segments */
+	if (qproc->dump_segment_mask == qproc->dump_complete_mask) {
+		if (qproc->dump_mba_loaded)
+			q6v5_mba_reclaim(qproc);
+	}
+}
+
 static int q6v5_start(struct rproc *rproc)
 {
 	struct q6v5 *qproc = (struct q6v5 *)rproc->priv;
···
 	if (xfermemop_ret)
 		dev_err(qproc->dev,
 			"Failed to reclaim mba buffer system may become unstable\n");
+
+	/* Reset Dump Segment Mask */
+	qproc->dump_segment_mask = 0;
 	qproc->running = true;
 
 	return 0;