[SCSI] scsi_trace: Enhance SCSI command tracing

Various SCSI trace enhancements:

 - Display data and protection information scatterlist lengths in the
   trace output

 - Add support for VERIFY and WRITE SAME commands and decode the UNMAP
   bit if applicable

 - Add decoding of the PROTECT field for READ/VERIFY/WRITE/WRITE SAME
   commands as well as the EXPECTED INITIAL REFERENCE TAG field for
   their 32-byte variants

 - Decode READ CAPACITY(16), GET LBA STATUS, and UNMAP

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 25 insertions, 8 deletions

diff --git a/include/trace/events/scsi.h b/include/trace/events/scsi.h
index 76cbf828eb8..25fbefdf2f2 100644
--- a/include/trace/events/scsi.h
+++ b/include/trace/events/scsi.h
@@ -200,6 +200,8 @@ TRACE_EVENT(scsi_dispatch_cmd_start,
 		__field( unsigned int,	lun	)
 		__field( unsigned int,	opcode	)
 		__field( unsigned int,	cmd_len )
+		__field( unsigned int,	data_sglen )
+		__field( unsigned int,	prot_sglen )
 		__dynamic_array(unsigned char,	cmnd, cmd->cmd_len)
 	),
 
@@ -210,12 +212,16 @@ TRACE_EVENT(scsi_dispatch_cmd_start,
 		__entry->lun		= cmd->device->lun;
 		__entry->opcode		= cmd->cmnd[0];
 		__entry->cmd_len	= cmd->cmd_len;
+		__entry->data_sglen	= scsi_sg_count(cmd);
+		__entry->prot_sglen	= scsi_prot_sg_count(cmd);
 		memcpy(__get_dynamic_array(cmnd), cmd->cmnd, cmd->cmd_len);
 	),
 
-	TP_printk("host_no=%u channel=%u id=%u lun=%u cmnd=(%s %s raw=%s)",
+	TP_printk("host_no=%u channel=%u id=%u lun=%u data_sgl=%u prot_sgl=%u" \
+		  " cmnd=(%s %s raw=%s)",
 		  __entry->host_no, __entry->channel, __entry->id,
-		  __entry->lun, show_opcode_name(__entry->opcode),
+		  __entry->lun, __entry->data_sglen, __entry->prot_sglen,
+		  show_opcode_name(__entry->opcode),
 		  __parse_cdb(__get_dynamic_array(cmnd), __entry->cmd_len),
 		  __print_hex(__get_dynamic_array(cmnd), __entry->cmd_len))
 );
@@ -234,6 +240,8 @@ TRACE_EVENT(scsi_dispatch_cmd_error,
 		__field( int,		rtn	)
 		__field( unsigned int,	opcode	)
 		__field( unsigned int,	cmd_len )
+		__field( unsigned int,	data_sglen )
+		__field( unsigned int,	prot_sglen )
 		__dynamic_array(unsigned char,	cmnd, cmd->cmd_len)
 	),
 
@@ -245,13 +253,16 @@ TRACE_EVENT(scsi_dispatch_cmd_error,
 		__entry->rtn		= rtn;
 		__entry->opcode		= cmd->cmnd[0];
 		__entry->cmd_len	= cmd->cmd_len;
+		__entry->data_sglen	= scsi_sg_count(cmd);
+		__entry->prot_sglen	= scsi_prot_sg_count(cmd);
 		memcpy(__get_dynamic_array(cmnd), cmd->cmnd, cmd->cmd_len);
 	),
 
-	TP_printk("host_no=%u channel=%u id=%u lun=%u cmnd=(%s %s raw=%s)"
-		  " rtn=%d",
+	TP_printk("host_no=%u channel=%u id=%u lun=%u data_sgl=%u prot_sgl=%u" \
+		  " cmnd=(%s %s raw=%s) rtn=%d",
 		  __entry->host_no, __entry->channel, __entry->id,
-		  __entry->lun, show_opcode_name(__entry->opcode),
+		  __entry->lun, __entry->data_sglen, __entry->prot_sglen,
+		  show_opcode_name(__entry->opcode),
 		  __parse_cdb(__get_dynamic_array(cmnd), __entry->cmd_len),
 		  __print_hex(__get_dynamic_array(cmnd), __entry->cmd_len),
 		  __entry->rtn)
@@ -271,6 +282,8 @@ DECLARE_EVENT_CLASS(scsi_cmd_done_timeout_template,
 		__field( int,		result	)
 		__field( unsigned int,	opcode	)
 		__field( unsigned int,	cmd_len )
+		__field( unsigned int,	data_sglen )
+		__field( unsigned int,	prot_sglen )
 		__dynamic_array(unsigned char,	cmnd, cmd->cmd_len)
 	),
 
@@ -282,13 +295,17 @@ DECLARE_EVENT_CLASS(scsi_cmd_done_timeout_template,
 		__entry->result		= cmd->result;
 		__entry->opcode		= cmd->cmnd[0];
 		__entry->cmd_len	= cmd->cmd_len;
+		__entry->data_sglen	= scsi_sg_count(cmd);
+		__entry->prot_sglen	= scsi_prot_sg_count(cmd);
 		memcpy(__get_dynamic_array(cmnd), cmd->cmnd, cmd->cmd_len);
 	),
 
-	TP_printk("host_no=%u channel=%u id=%u lun=%u cmnd=(%s %s raw=%s) "
-		  "result=(driver=%s host=%s message=%s status=%s)",
+	TP_printk("host_no=%u channel=%u id=%u lun=%u data_sgl=%u " \
+		  "prot_sgl=%u cmnd=(%s %s raw=%s) result=(driver=%s host=%s " \
+		  "message=%s status=%s)",
 		  __entry->host_no, __entry->channel, __entry->id,
-		  __entry->lun, show_opcode_name(__entry->opcode),
+		  __entry->lun, __entry->data_sglen, __entry->prot_sglen,
+		  show_opcode_name(__entry->opcode),
 		  __parse_cdb(__get_dynamic_array(cmnd), __entry->cmd_len),
 		  __print_hex(__get_dynamic_array(cmnd), __entry->cmd_len),
 		  show_driverbyte_name(((__entry->result) >> 24) & 0xff),