[PATCH v6 6/6] drm/xe/guc: Only add GuC crash dump if available

[Zhanjun Dong]

Add GuC crash dump data empty check. LFD will only include crash dump
section when data is not empty.

Signed-off-by: Zhanjun Dong <zhanjun.dong at intel.com>
---
 drivers/gpu/drm/xe/xe_guc_log.c | 60 +++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_guc_log.c b/drivers/gpu/drm/xe/xe_guc_log.c
index a8910211c579..f5f31f15e7e3 100644
--- a/drivers/gpu/drm/xe/xe_guc_log.c
+++ b/drivers/gpu/drm/xe/xe_guc_log.c
@@ -502,6 +502,65 @@ xe_guc_log_add_log_event(struct drm_printer *p, struct xe_guc_log_snapshot *snap
 	return size;
 }
 
+static int
+xe_guc_log_add_crash_dump(struct drm_printer *p, struct xe_guc_log_snapshot *snapshot,
+			  struct guc_lic_save *config)
+{
+	struct guc_log_buffer_entry_list *entry;
+	int chunk_from, chunk_id, to_chunk_id;
+	int pos, from, to;
+	size_t size = 0;
+	char buf[GUC_LFD_BUFFER_SIZE] = {0};
+
+	entry = &config->entry[GUC_LOG_BUFFER_STATE_HEADER_ENTRY_CRASH];
+
+	/* Skip zero sized crash dump */
+	if (!entry->buf_size)
+		return 0;
+
+	/* Check if crash dump section are all zero */
+	from = entry->offset;
+	to = entry->offset + entry->buf_size;
+	chunk_from = from % GUC_LOG_CHUNK_SIZE;
+	chunk_id = from / GUC_LOG_CHUNK_SIZE;
+	to_chunk_id = to / GUC_LOG_CHUNK_SIZE;
+	pos = from;
+
+	do {
+		size_t size = (to_chunk_id > chunk_id ? GUC_LOG_CHUNK_SIZE : to) - chunk_from;
+		u32 *buf32 = snapshot->copy[chunk_id] + chunk_from;
+		int i;
+
+		for (i = 0; i < size / sizeof(u32); i++)
+			if (buf32[i])
+				break;
+		if (i < size / sizeof(u32)) {
+			pos += i * sizeof(u32) - chunk_from;
+			break;
+		}
+		pos += size;
+		chunk_id++;
+		chunk_from = 0;
+	} while (pos < to);
+
+	/* Buffer has non-zero data? */
+	if (pos < to) {
+		struct guc_lfd_data *lfd = (void *)buf;
+
+		size = xe_guc_log_add_lfd_header(buf, GUC_LFD_BUFFER_SIZE);
+		lfd->dw0 |= FIELD_PREP(GUC_LFD_DATA_DESC_TYPE, GUC_LFD_TYPE_FW_CRASH_DUMP);
+		/* Calculate data length */
+		lfd->dw_size = DIV_ROUND_UP(entry->buf_size, sizeof(u32));
+		/* Output GUC_LFD_TYPE_FW_CRASH_DUMP header */
+		xe_print_blob_ascii85(p, NULL, 0, buf, 0, size);
+
+		/* rd/wr ptr is not used for crash dump */
+		xe_guc_log_print_over_chunks(p, snapshot, entry->offset,
+					     entry->offset + entry->buf_size);
+	}
+	return size;
+}
+
 static void
 xe_guc_log_snapshot_print_lfd(struct xe_guc_log_snapshot *snapshot, struct drm_printer *p)
 {
@@ -522,6 +581,7 @@ xe_guc_log_snapshot_print_lfd(struct xe_guc_log_snapshot *snapshot, struct drm_p
 		return;
 
 	xe_guc_log_add_log_event(p, snapshot, &config);
+	xe_guc_log_add_crash_dump(p, snapshot, &config);
 }
 
 /**
-- 
2.34.1