ata: libata: add qc_prep tracepoint

Convert the existing ata_qc_issue() tracepoint into a template,
and add tracepoints for ata_qc_prep() and ata_qc_issue() based
on that template.

Signed-off-by: Hannes Reinecke <[e-mail]>
Signed-off-by: Damien Le Moal <[e-mail]>

drivers/ata/libata-core.c

···
 		return;
 	}
 
+	trace_ata_qc_prep(qc);
 	qc->err_mask |= ap->ops->qc_prep(qc);
 	if (unlikely(qc->err_mask))
 		goto err;

include/trace/events/libata.h

···
 				      unsigned char, unsigned char);
 #define __parse_subcmd(c,f,h) libata_trace_parse_subcmd(p, c, f, h)
 
-TRACE_EVENT(ata_qc_issue,
+DECLARE_EVENT_CLASS(ata_qc_issue_template,
 
 	TP_PROTO(struct ata_queued_cmd *qc),
 
···
 		  __entry->hob_lbal, __entry->hob_lbam, __entry->hob_lbah,
 		  __entry->dev)
 );
+
+DEFINE_EVENT(ata_qc_issue_template, ata_qc_prep,
+	     TP_PROTO(struct ata_queued_cmd *qc),
+	     TP_ARGS(qc));
+
+DEFINE_EVENT(ata_qc_issue_template, ata_qc_issue,
+	     TP_PROTO(struct ata_queued_cmd *qc),
+	     TP_ARGS(qc));
 
 DECLARE_EVENT_CLASS(ata_qc_complete_template,