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scsi: target: core: Add CONTROL field for trace events

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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@yadro.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Roman Bolshakov
2020-09-29 15:59:57 +03:00
committed by Martin K. Petersen
parent 718c2fe92b
commit 7010645ba7
2 changed files with 13 additions and 6 deletions
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7
include/scsi/scsi_common.h
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@@ -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);