[PATCH v3 4/4] drm/xe/guc: Only add GuC crash dump if available

[Zhanjun Dong <zhanjun.dong@intel.com>]

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@intel.com>
---
 drivers/gpu/drm/xe/xe_guc_log.c | 35 +++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_guc_log.c b/drivers/gpu/drm/xe/xe_guc_log.c
index 7cdf6bf238f3..1e5976a382be 100644
--- a/drivers/gpu/drm/xe/xe_guc_log.c
+++ b/drivers/gpu/drm/xe/xe_guc_log.c
@@ -407,6 +407,36 @@ xe_guc_log_add_log_event(char *buf, int buf_size, char *log_bin,
 	return len + lfd->desc_dw_size * sizeof(u32);
 }
 
+static int
+xe_guc_log_add_crash_dump(char *buf, int buf_size, char *log_bin,
+			  struct guc_log_init_config_save_t *config)
+{
+	int i, dw_size;
+	u32 *buf32;
+	struct guc_log_buffer_entry_list *entry;
+
+	entry = &entry_list[GUC_LOG_BUFFER_STATE_HEADER_ENTRY_CRASH];
+
+	/* Skip empty log */
+	if (!entry->buf_size)
+		return 0;
+
+	buf32 = (u32 *)&log_bin[entry->offset];
+	dw_size = entry->buf_size / sizeof(u32);
+
+	/* Check if crash dump section are all zero */
+	for (i = 0; i < dw_size; i++)
+		if (buf32[i])
+			break;
+
+	/* Buffer has non-zero data? */
+	if (i < dw_size)
+		return xe_guc_log_add_typed_payload(buf, buf_size,
+						    GUC_LFD_TYPE_FW_CRASH_DUMP,
+						    entry->buf_size, buf32);
+	return 0;
+}
+
 static inline int lic_type_to_KLV_index(u32 lic_type)
 {
 	XE_WARN_ON(lic_type < GUC_LOG_LIC_TYPE_FIRST || lic_type >= GUC_LOG_LIC_TYPE_LAST);
@@ -532,6 +562,11 @@ static int xe_guc_log_save_to_lfd_buf(char *buf, int size, u32 *guc_log_bin,
 		return len;
 	index += len;
 
+	len = xe_guc_log_add_crash_dump(&buf[index], size - index, char_bin, config);
+	if (len < 0)
+		return len;
+	index += len;
+
 	return index;
 }
 
-- 
2.34.1