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authorSteffen Maier <maier@linux.ibm.com>2018-05-17 19:14:50 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2018-05-18 11:22:11 -0400
commit8221211863750b1afb1f464a264c05383b077a06 (patch)
tree7141614228170bbb2fc00de1bd8793b7a7412007 /drivers/s390/scsi/zfcp_dbf.c
parent6a76550841d412330bd86aed3238d1888ba70f0e (diff)
scsi: zfcp: decouple SCSI traces for scsi_eh / TMF from scsi_cmnd
The SCSI command pointer passed to scsi_eh callbacks is just one arbitrary command of potentially many that are in the eh queue to be processed. The command is only used to indirectly pass the TMF scope in terms of SCSI ID/target and SCSI LUN for LUN reset. Hence, zfcp had filled in SCSI trace record fields which do not really belong to the TMF. This was confusing. Therefore, refactor the TMF tracing to work without SCSI command. Since the FCP channel always requires a valid LUN handle, we use SCSI device as common context for any TMF (even target reset). To make it even clearer, we set all bits to 1 for the fields, which do not belong to the TMF, to indicate that these fields are invalid. The old zfcp_dbf_scsi() became zfcp_dbf_scsi_common() to now handle both SCSI commands and TMFs. The old argument scsi_cmnd is now optional and can be NULL with TMFs. The new argument scsi_device is mandatory to carry context, as well as SCSI ID/target and SCSI LUN in case of TMFs. New example trace record formatted with zfcpdbf from s390-tools: Timestamp : ... Area : SCSI Subarea : 00 Level : 1 Exception : - CPU ID : .. Caller : 0x... Record ID : 1 Tag : [lt]r_.... Request ID : 0x<reqid> ID of FSF FCP request with TM flag For cases without FSF request: 0x0 for none (invalid) SCSI ID : 0x<scsi_id> SCSI ID/target denoting scope SCSI LUN : 0x<scsi_lun> SCSI LUN denoting scope SCSI LUN high : 0x<scsi_lun_high> SCSI LUN denoting scope SCSI result : 0xffffffff none (invalid) SCSI retries : 0xff none (invalid) SCSI allowed : 0xff none (invalid) SCSI scribble : 0xffffffffffffffff none (invalid) SCSI opcode : ffffffff ffffffff ffffffff ffffffff none (invalid) FCP rsp inf cod: 0x00 FCP_RSP info code of TMF FCP rsp IU : 00000000 00000000 00000100 00000000 ext FCP_RSP IU 00000000 00000008 ext FCP_RSP IU FCP rsp IU len : 32 FCP_RSP IU length Payload time : ... FCP rsp IU all : 00000000 00000000 00000100 00000000 full FCP_RSP IU 00000000 00000008 00000000 00000000 full FCP_RSP IU Signed-off-by: Steffen Maier <maier@linux.ibm.com> Reviewed-by: Benjamin Block <bblock@linux.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/s390/scsi/zfcp_dbf.c')
-rw-r--r--drivers/s390/scsi/zfcp_dbf.c48
1 files changed, 31 insertions, 17 deletions
diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c
index 1e5ea5e4992b..bb3373260169 100644
--- a/drivers/s390/scsi/zfcp_dbf.c
+++ b/drivers/s390/scsi/zfcp_dbf.c
@@ -578,16 +578,18 @@ void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
}
/**
- * zfcp_dbf_scsi - trace event for scsi commands
- * @tag: identifier for event
- * @sc: pointer to struct scsi_cmnd
- * @fsf: pointer to struct zfcp_fsf_req
+ * zfcp_dbf_scsi_common() - Common trace event helper for scsi.
+ * @tag: Identifier for event.
+ * @level: trace level of event.
+ * @sdev: Pointer to SCSI device as context for this event.
+ * @sc: Pointer to SCSI command, or NULL with task management function (TMF).
+ * @fsf: Pointer to FSF request, or NULL.
*/
-void zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *sc,
- struct zfcp_fsf_req *fsf)
+void zfcp_dbf_scsi_common(char *tag, int level, struct scsi_device *sdev,
+ struct scsi_cmnd *sc, struct zfcp_fsf_req *fsf)
{
struct zfcp_adapter *adapter =
- (struct zfcp_adapter *) sc->device->host->hostdata[0];
+ (struct zfcp_adapter *) sdev->host->hostdata[0];
struct zfcp_dbf *dbf = adapter->dbf;
struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
struct fcp_resp_with_ext *fcp_rsp;
@@ -599,16 +601,28 @@ void zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *sc,
memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
rec->id = ZFCP_DBF_SCSI_CMND;
- rec->scsi_result = sc->result;
- rec->scsi_retries = sc->retries;
- rec->scsi_allowed = sc->allowed;
- rec->scsi_id = sc->device->id;
- rec->scsi_lun = (u32)sc->device->lun;
- rec->scsi_lun_64_hi = (u32)(sc->device->lun >> 32);
- rec->host_scribble = (unsigned long)sc->host_scribble;
-
- memcpy(rec->scsi_opcode, sc->cmnd,
- min((int)sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
+ if (sc) {
+ rec->scsi_result = sc->result;
+ rec->scsi_retries = sc->retries;
+ rec->scsi_allowed = sc->allowed;
+ rec->scsi_id = sc->device->id;
+ rec->scsi_lun = (u32)sc->device->lun;
+ rec->scsi_lun_64_hi = (u32)(sc->device->lun >> 32);
+ rec->host_scribble = (unsigned long)sc->host_scribble;
+
+ memcpy(rec->scsi_opcode, sc->cmnd,
+ min_t(int, sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
+ } else {
+ rec->scsi_result = ~0;
+ rec->scsi_retries = ~0;
+ rec->scsi_allowed = ~0;
+ rec->scsi_id = sdev->id;
+ rec->scsi_lun = (u32)sdev->lun;
+ rec->scsi_lun_64_hi = (u32)(sdev->lun >> 32);
+ rec->host_scribble = ~0;
+
+ memset(rec->scsi_opcode, 0xff, ZFCP_DBF_SCSI_OPCODE);
+ }
if (fsf) {
rec->fsf_req_id = fsf->req_id;