From: Roman Bolshakov <r.bolshakov@xxxxxxxxx> [ Upstream commit 7010645ba7256992818b518163f46bd4cdf8002a ] trace-cmd report doesn't show events from target subsystem because scsi_command_size() leaks through event format string: [target:target_sequencer_start] function scsi_command_size not defined [target:target_cmd_complete] function scsi_command_size not defined Addition of scsi_command_size() to plugin_scsi.c in trace-cmd doesn't help because an expression is used inside TP_printk(). trace-cmd event parser doesn't understand minus sign inside [ ]: Error: expected ']' but read '-' Rather than duplicating kernel code in plugin_scsi.c, provide a dedicated field for CONTROL byte. Link: https://lore.kernel.org/r/20200929125957.83069-1-r.bolshakov@xxxxxxxxx Reviewed-by: Mike Christie <michael.christie@xxxxxxxxxx> Signed-off-by: Roman Bolshakov <r.bolshakov@xxxxxxxxx> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- include/scsi/scsi_common.h | 7 +++++++ include/trace/events/target.h | 12 ++++++------ 2 files changed, 13 insertions(+), 6 deletions(-) diff --git a/include/scsi/scsi_common.h b/include/scsi/scsi_common.h index 731ac09ed2313..5b567b43e1b16 100644 --- a/include/scsi/scsi_common.h +++ b/include/scsi/scsi_common.h @@ -25,6 +25,13 @@ scsi_command_size(const unsigned char *cmnd) scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]); } +static inline unsigned char +scsi_command_control(const unsigned char *cmnd) +{ + return (cmnd[0] == VARIABLE_LENGTH_CMD) ? + cmnd[1] : cmnd[COMMAND_SIZE(cmnd[0]) - 1]; +} + /* Returns a human-readable name for the device */ extern const char *scsi_device_type(unsigned type); diff --git a/include/trace/events/target.h b/include/trace/events/target.h index 77408edd29d2a..67fad2677ed55 100644 --- a/include/trace/events/target.h +++ b/include/trace/events/target.h @@ -141,6 +141,7 @@ TRACE_EVENT(target_sequencer_start, __field( unsigned int, opcode ) __field( unsigned int, data_length ) __field( unsigned int, task_attribute ) + __field( unsigned char, control ) __array( unsigned char, cdb, TCM_MAX_COMMAND_SIZE ) __string( initiator, cmd->se_sess->se_node_acl->initiatorname ) ), @@ -151,6 +152,7 @@ TRACE_EVENT(target_sequencer_start, __entry->opcode = cmd->t_task_cdb[0]; __entry->data_length = cmd->data_length; __entry->task_attribute = cmd->sam_task_attr; + __entry->control = scsi_command_control(cmd->t_task_cdb); memcpy(__entry->cdb, cmd->t_task_cdb, TCM_MAX_COMMAND_SIZE); __assign_str(initiator, cmd->se_sess->se_node_acl->initiatorname); ), @@ -160,9 +162,7 @@ TRACE_EVENT(target_sequencer_start, __entry->tag, show_opcode_name(__entry->opcode), __entry->data_length, __print_hex(__entry->cdb, 16), show_task_attribute_name(__entry->task_attribute), - scsi_command_size(__entry->cdb) <= 16 ? - __entry->cdb[scsi_command_size(__entry->cdb) - 1] : - __entry->cdb[1] + __entry->control ) ); @@ -178,6 +178,7 @@ TRACE_EVENT(target_cmd_complete, __field( unsigned int, opcode ) __field( unsigned int, data_length ) __field( unsigned int, task_attribute ) + __field( unsigned char, control ) __field( unsigned char, scsi_status ) __field( unsigned char, sense_length ) __array( unsigned char, cdb, TCM_MAX_COMMAND_SIZE ) @@ -191,6 +192,7 @@ TRACE_EVENT(target_cmd_complete, __entry->opcode = cmd->t_task_cdb[0]; __entry->data_length = cmd->data_length; __entry->task_attribute = cmd->sam_task_attr; + __entry->control = scsi_command_control(cmd->t_task_cdb); __entry->scsi_status = cmd->scsi_status; __entry->sense_length = cmd->scsi_status == SAM_STAT_CHECK_CONDITION ? min(18, ((u8 *) cmd->sense_buffer)[SPC_ADD_SENSE_LEN_OFFSET] + 8) : 0; @@ -208,9 +210,7 @@ TRACE_EVENT(target_cmd_complete, show_opcode_name(__entry->opcode), __entry->data_length, __print_hex(__entry->cdb, 16), show_task_attribute_name(__entry->task_attribute), - scsi_command_size(__entry->cdb) <= 16 ? - __entry->cdb[scsi_command_size(__entry->cdb) - 1] : - __entry->cdb[1] + __entry->control ) ); -- 2.25.1
