![Steffen Maier](/assets/img/avatar_default.png)
If the mapping of FCP device bus ID and corresponding subchannel is modified while the Linux image is suspended, the resume of FCP devices can fail. During resume, zfcp gets callbacks from cio regarding the modified subchannels but they can be arbitrarily mixed with the restore/resume callback. Since the cio callbacks would trigger adapter recovery, zfcp could wakeup before the resume callback. Therefore, ignore the cio callbacks regarding subchannels while being suspended. We can safely do so, since zfcp does not deal itself with subchannels. For problem determination purposes, we still trace the ignored callback events. The following kernel messages could be seen on resume: kernel: <WWPN>: parent <FCP device bus ID> should not be sleeping As part of adapter reopen recovery, zfcp performs auto port scanning which can erroneously try to register new remote ports with scsi_transport_fc and the device core code complains about the parent (adapter) still sleeping. kernel: zfcp.3dff9c: <FCP device bus ID>:\ Setting up the QDIO connection to the FCP adapter failed <last kernel message repeated 3 more times> kernel: zfcp.574d43: <FCP device bus ID>:\ ERP cannot recover an error on the FCP device In such cases, the adapter gave up recovery and remained blocked along with its child objects: remote ports and LUNs/scsi devices. Even the adapter shutdown as part of giving up recovery failed because the ccw device state remained disconnected. Later, the corresponding remote ports ran into dev_loss_tmo. As a result, the LUNs were erroneously not available again after resume. Even a manually triggered adapter recovery (e.g. sysfs attribute failed, or device offline/online via sysfs) could not recover the adapter due to the remaining disconnected state of the corresponding ccw device. Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com> Cc: <stable@vger.kernel.org> #2.6.32+ Signed-off-by: James Bottomley <JBottomley@Parallels.com>
538 lines
15 KiB
C
538 lines
15 KiB
C
/*
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* zfcp device driver
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*
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* Debug traces for zfcp.
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*
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* Copyright IBM Corp. 2002, 2010
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*/
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#define KMSG_COMPONENT "zfcp"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/ctype.h>
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#include <linux/slab.h>
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#include <asm/debug.h>
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#include "zfcp_dbf.h"
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#include "zfcp_ext.h"
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#include "zfcp_fc.h"
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static u32 dbfsize = 4;
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module_param(dbfsize, uint, 0400);
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MODULE_PARM_DESC(dbfsize,
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"number of pages for each debug feature area (default 4)");
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static inline unsigned int zfcp_dbf_plen(unsigned int offset)
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{
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return sizeof(struct zfcp_dbf_pay) + offset - ZFCP_DBF_PAY_MAX_REC;
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}
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static inline
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void zfcp_dbf_pl_write(struct zfcp_dbf *dbf, void *data, u16 length, char *area,
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u64 req_id)
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{
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struct zfcp_dbf_pay *pl = &dbf->pay_buf;
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u16 offset = 0, rec_length;
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spin_lock(&dbf->pay_lock);
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memset(pl, 0, sizeof(*pl));
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pl->fsf_req_id = req_id;
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memcpy(pl->area, area, ZFCP_DBF_TAG_LEN);
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while (offset < length) {
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rec_length = min((u16) ZFCP_DBF_PAY_MAX_REC,
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(u16) (length - offset));
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memcpy(pl->data, data + offset, rec_length);
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debug_event(dbf->pay, 1, pl, zfcp_dbf_plen(rec_length));
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offset += rec_length;
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pl->counter++;
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}
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spin_unlock(&dbf->pay_lock);
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}
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/**
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* zfcp_dbf_hba_fsf_res - trace event for fsf responses
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* @tag: tag indicating which kind of unsolicited status has been received
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* @req: request for which a response was received
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*/
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void zfcp_dbf_hba_fsf_res(char *tag, struct zfcp_fsf_req *req)
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{
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struct zfcp_dbf *dbf = req->adapter->dbf;
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struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix;
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struct fsf_qtcb_header *q_head = &req->qtcb->header;
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struct zfcp_dbf_hba *rec = &dbf->hba_buf;
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unsigned long flags;
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spin_lock_irqsave(&dbf->hba_lock, flags);
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memset(rec, 0, sizeof(*rec));
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memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
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rec->id = ZFCP_DBF_HBA_RES;
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rec->fsf_req_id = req->req_id;
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rec->fsf_req_status = req->status;
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rec->fsf_cmd = req->fsf_command;
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rec->fsf_seq_no = req->seq_no;
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rec->u.res.req_issued = req->issued;
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rec->u.res.prot_status = q_pref->prot_status;
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rec->u.res.fsf_status = q_head->fsf_status;
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memcpy(rec->u.res.prot_status_qual, &q_pref->prot_status_qual,
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FSF_PROT_STATUS_QUAL_SIZE);
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memcpy(rec->u.res.fsf_status_qual, &q_head->fsf_status_qual,
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FSF_STATUS_QUALIFIER_SIZE);
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if (req->fsf_command != FSF_QTCB_FCP_CMND) {
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rec->pl_len = q_head->log_length;
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zfcp_dbf_pl_write(dbf, (char *)q_pref + q_head->log_start,
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rec->pl_len, "fsf_res", req->req_id);
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}
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debug_event(dbf->hba, 1, rec, sizeof(*rec));
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spin_unlock_irqrestore(&dbf->hba_lock, flags);
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}
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/**
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* zfcp_dbf_hba_fsf_uss - trace event for an unsolicited status buffer
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* @tag: tag indicating which kind of unsolicited status has been received
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* @req: request providing the unsolicited status
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*/
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void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req)
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{
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struct zfcp_dbf *dbf = req->adapter->dbf;
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struct fsf_status_read_buffer *srb = req->data;
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struct zfcp_dbf_hba *rec = &dbf->hba_buf;
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unsigned long flags;
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spin_lock_irqsave(&dbf->hba_lock, flags);
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memset(rec, 0, sizeof(*rec));
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memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
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rec->id = ZFCP_DBF_HBA_USS;
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rec->fsf_req_id = req->req_id;
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rec->fsf_req_status = req->status;
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rec->fsf_cmd = req->fsf_command;
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if (!srb)
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goto log;
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rec->u.uss.status_type = srb->status_type;
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rec->u.uss.status_subtype = srb->status_subtype;
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rec->u.uss.d_id = ntoh24(srb->d_id);
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rec->u.uss.lun = srb->fcp_lun;
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memcpy(&rec->u.uss.queue_designator, &srb->queue_designator,
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sizeof(rec->u.uss.queue_designator));
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/* status read buffer payload length */
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rec->pl_len = (!srb->length) ? 0 : srb->length -
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offsetof(struct fsf_status_read_buffer, payload);
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if (rec->pl_len)
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zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len,
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"fsf_uss", req->req_id);
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log:
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debug_event(dbf->hba, 2, rec, sizeof(*rec));
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spin_unlock_irqrestore(&dbf->hba_lock, flags);
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}
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/**
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* zfcp_dbf_hba_bit_err - trace event for bit error conditions
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* @tag: tag indicating which kind of unsolicited status has been received
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* @req: request which caused the bit_error condition
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*/
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void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req)
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{
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struct zfcp_dbf *dbf = req->adapter->dbf;
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struct zfcp_dbf_hba *rec = &dbf->hba_buf;
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struct fsf_status_read_buffer *sr_buf = req->data;
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unsigned long flags;
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spin_lock_irqsave(&dbf->hba_lock, flags);
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memset(rec, 0, sizeof(*rec));
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memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
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rec->id = ZFCP_DBF_HBA_BIT;
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rec->fsf_req_id = req->req_id;
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rec->fsf_req_status = req->status;
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rec->fsf_cmd = req->fsf_command;
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memcpy(&rec->u.be, &sr_buf->payload.bit_error,
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sizeof(struct fsf_bit_error_payload));
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debug_event(dbf->hba, 1, rec, sizeof(*rec));
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spin_unlock_irqrestore(&dbf->hba_lock, flags);
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}
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/**
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* zfcp_dbf_hba_def_err - trace event for deferred error messages
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* @adapter: pointer to struct zfcp_adapter
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* @req_id: request id which caused the deferred error message
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* @scount: number of sbals incl. the signaling sbal
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* @pl: array of all involved sbals
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*/
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void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount,
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void **pl)
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{
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struct zfcp_dbf *dbf = adapter->dbf;
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struct zfcp_dbf_pay *payload = &dbf->pay_buf;
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unsigned long flags;
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u16 length;
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if (!pl)
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return;
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spin_lock_irqsave(&dbf->pay_lock, flags);
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memset(payload, 0, sizeof(*payload));
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memcpy(payload->area, "def_err", 7);
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payload->fsf_req_id = req_id;
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payload->counter = 0;
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length = min((u16)sizeof(struct qdio_buffer),
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(u16)ZFCP_DBF_PAY_MAX_REC);
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while (payload->counter < scount && (char *)pl[payload->counter]) {
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memcpy(payload->data, (char *)pl[payload->counter], length);
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debug_event(dbf->pay, 1, payload, zfcp_dbf_plen(length));
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payload->counter++;
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}
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spin_unlock_irqrestore(&dbf->pay_lock, flags);
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}
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/**
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* zfcp_dbf_hba_basic - trace event for basic adapter events
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* @adapter: pointer to struct zfcp_adapter
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*/
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void zfcp_dbf_hba_basic(char *tag, struct zfcp_adapter *adapter)
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{
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struct zfcp_dbf *dbf = adapter->dbf;
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struct zfcp_dbf_hba *rec = &dbf->hba_buf;
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unsigned long flags;
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spin_lock_irqsave(&dbf->hba_lock, flags);
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memset(rec, 0, sizeof(*rec));
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memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
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rec->id = ZFCP_DBF_HBA_BASIC;
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debug_event(dbf->hba, 1, rec, sizeof(*rec));
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spin_unlock_irqrestore(&dbf->hba_lock, flags);
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}
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static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec,
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struct zfcp_adapter *adapter,
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struct zfcp_port *port,
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struct scsi_device *sdev)
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{
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rec->adapter_status = atomic_read(&adapter->status);
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if (port) {
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rec->port_status = atomic_read(&port->status);
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rec->wwpn = port->wwpn;
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rec->d_id = port->d_id;
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}
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if (sdev) {
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rec->lun_status = atomic_read(&sdev_to_zfcp(sdev)->status);
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rec->lun = zfcp_scsi_dev_lun(sdev);
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}
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}
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/**
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* zfcp_dbf_rec_trig - trace event related to triggered recovery
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* @tag: identifier for event
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* @adapter: adapter on which the erp_action should run
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* @port: remote port involved in the erp_action
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* @sdev: scsi device involved in the erp_action
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* @want: wanted erp_action
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* @need: required erp_action
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*
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* The adapter->erp_lock has to be held.
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*/
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void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter,
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struct zfcp_port *port, struct scsi_device *sdev,
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u8 want, u8 need)
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{
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struct zfcp_dbf *dbf = adapter->dbf;
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struct zfcp_dbf_rec *rec = &dbf->rec_buf;
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struct list_head *entry;
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unsigned long flags;
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spin_lock_irqsave(&dbf->rec_lock, flags);
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memset(rec, 0, sizeof(*rec));
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rec->id = ZFCP_DBF_REC_TRIG;
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memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
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zfcp_dbf_set_common(rec, adapter, port, sdev);
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list_for_each(entry, &adapter->erp_ready_head)
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rec->u.trig.ready++;
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list_for_each(entry, &adapter->erp_running_head)
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rec->u.trig.running++;
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rec->u.trig.want = want;
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rec->u.trig.need = need;
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debug_event(dbf->rec, 1, rec, sizeof(*rec));
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spin_unlock_irqrestore(&dbf->rec_lock, flags);
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}
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/**
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* zfcp_dbf_rec_run - trace event related to running recovery
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* @tag: identifier for event
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* @erp: erp_action running
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*/
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void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp)
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{
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struct zfcp_dbf *dbf = erp->adapter->dbf;
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struct zfcp_dbf_rec *rec = &dbf->rec_buf;
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unsigned long flags;
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spin_lock_irqsave(&dbf->rec_lock, flags);
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memset(rec, 0, sizeof(*rec));
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rec->id = ZFCP_DBF_REC_RUN;
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memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
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zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev);
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rec->u.run.fsf_req_id = erp->fsf_req_id;
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rec->u.run.rec_status = erp->status;
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rec->u.run.rec_step = erp->step;
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rec->u.run.rec_action = erp->action;
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if (erp->sdev)
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rec->u.run.rec_count =
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atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter);
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else if (erp->port)
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rec->u.run.rec_count = atomic_read(&erp->port->erp_counter);
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else
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rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter);
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debug_event(dbf->rec, 1, rec, sizeof(*rec));
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spin_unlock_irqrestore(&dbf->rec_lock, flags);
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}
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static inline
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void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, void *data, u8 id, u16 len,
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u64 req_id, u32 d_id)
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{
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struct zfcp_dbf_san *rec = &dbf->san_buf;
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u16 rec_len;
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unsigned long flags;
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spin_lock_irqsave(&dbf->san_lock, flags);
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memset(rec, 0, sizeof(*rec));
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rec->id = id;
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rec->fsf_req_id = req_id;
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rec->d_id = d_id;
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rec_len = min(len, (u16)ZFCP_DBF_SAN_MAX_PAYLOAD);
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memcpy(rec->payload, data, rec_len);
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memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
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debug_event(dbf->san, 1, rec, sizeof(*rec));
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spin_unlock_irqrestore(&dbf->san_lock, flags);
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}
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/**
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* zfcp_dbf_san_req - trace event for issued SAN request
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* @tag: indentifier for event
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* @fsf_req: request containing issued CT data
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* d_id: destination ID
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*/
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void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
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{
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struct zfcp_dbf *dbf = fsf->adapter->dbf;
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struct zfcp_fsf_ct_els *ct_els = fsf->data;
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u16 length;
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length = (u16)(ct_els->req->length + FC_CT_HDR_LEN);
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zfcp_dbf_san(tag, dbf, sg_virt(ct_els->req), ZFCP_DBF_SAN_REQ, length,
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fsf->req_id, d_id);
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}
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/**
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* zfcp_dbf_san_res - trace event for received SAN request
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* @tag: indentifier for event
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* @fsf_req: request containing issued CT data
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*/
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void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
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{
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struct zfcp_dbf *dbf = fsf->adapter->dbf;
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struct zfcp_fsf_ct_els *ct_els = fsf->data;
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u16 length;
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length = (u16)(ct_els->resp->length + FC_CT_HDR_LEN);
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zfcp_dbf_san(tag, dbf, sg_virt(ct_els->resp), ZFCP_DBF_SAN_RES, length,
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fsf->req_id, 0);
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}
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/**
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* zfcp_dbf_san_in_els - trace event for incoming ELS
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* @tag: indentifier for event
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* @fsf_req: request containing issued CT data
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*/
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void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
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{
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struct zfcp_dbf *dbf = fsf->adapter->dbf;
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struct fsf_status_read_buffer *srb =
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(struct fsf_status_read_buffer *) fsf->data;
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u16 length;
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length = (u16)(srb->length -
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offsetof(struct fsf_status_read_buffer, payload));
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zfcp_dbf_san(tag, dbf, srb->payload.data, ZFCP_DBF_SAN_ELS, length,
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fsf->req_id, ntoh24(srb->d_id));
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}
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/**
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* zfcp_dbf_scsi - trace event for scsi commands
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* @tag: identifier for event
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* @sc: pointer to struct scsi_cmnd
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* @fsf: pointer to struct zfcp_fsf_req
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*/
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void zfcp_dbf_scsi(char *tag, struct scsi_cmnd *sc, struct zfcp_fsf_req *fsf)
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{
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struct zfcp_adapter *adapter =
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(struct zfcp_adapter *) sc->device->host->hostdata[0];
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struct zfcp_dbf *dbf = adapter->dbf;
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struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
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struct fcp_resp_with_ext *fcp_rsp;
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struct fcp_resp_rsp_info *fcp_rsp_info;
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unsigned long flags;
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spin_lock_irqsave(&dbf->scsi_lock, flags);
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memset(rec, 0, sizeof(*rec));
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memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
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rec->id = ZFCP_DBF_SCSI_CMND;
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rec->scsi_result = sc->result;
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rec->scsi_retries = sc->retries;
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rec->scsi_allowed = sc->allowed;
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rec->scsi_id = sc->device->id;
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rec->scsi_lun = sc->device->lun;
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rec->host_scribble = (unsigned long)sc->host_scribble;
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memcpy(rec->scsi_opcode, sc->cmnd,
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min((int)sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
|
|
|
|
if (fsf) {
|
|
rec->fsf_req_id = fsf->req_id;
|
|
fcp_rsp = (struct fcp_resp_with_ext *)
|
|
&(fsf->qtcb->bottom.io.fcp_rsp);
|
|
memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT);
|
|
if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) {
|
|
fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
|
|
rec->fcp_rsp_info = fcp_rsp_info->rsp_code;
|
|
}
|
|
if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) {
|
|
rec->pl_len = min((u16)SCSI_SENSE_BUFFERSIZE,
|
|
(u16)ZFCP_DBF_PAY_MAX_REC);
|
|
zfcp_dbf_pl_write(dbf, sc->sense_buffer, rec->pl_len,
|
|
"fcp_sns", fsf->req_id);
|
|
}
|
|
}
|
|
|
|
debug_event(dbf->scsi, 1, rec, sizeof(*rec));
|
|
spin_unlock_irqrestore(&dbf->scsi_lock, flags);
|
|
}
|
|
|
|
static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size)
|
|
{
|
|
struct debug_info *d;
|
|
|
|
d = debug_register(name, size, 1, rec_size);
|
|
if (!d)
|
|
return NULL;
|
|
|
|
debug_register_view(d, &debug_hex_ascii_view);
|
|
debug_set_level(d, 3);
|
|
|
|
return d;
|
|
}
|
|
|
|
static void zfcp_dbf_unregister(struct zfcp_dbf *dbf)
|
|
{
|
|
if (!dbf)
|
|
return;
|
|
|
|
debug_unregister(dbf->scsi);
|
|
debug_unregister(dbf->san);
|
|
debug_unregister(dbf->hba);
|
|
debug_unregister(dbf->pay);
|
|
debug_unregister(dbf->rec);
|
|
kfree(dbf);
|
|
}
|
|
|
|
/**
|
|
* zfcp_adapter_debug_register - registers debug feature for an adapter
|
|
* @adapter: pointer to adapter for which debug features should be registered
|
|
* return: -ENOMEM on error, 0 otherwise
|
|
*/
|
|
int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter)
|
|
{
|
|
char name[DEBUG_MAX_NAME_LEN];
|
|
struct zfcp_dbf *dbf;
|
|
|
|
dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL);
|
|
if (!dbf)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&dbf->pay_lock);
|
|
spin_lock_init(&dbf->hba_lock);
|
|
spin_lock_init(&dbf->san_lock);
|
|
spin_lock_init(&dbf->scsi_lock);
|
|
spin_lock_init(&dbf->rec_lock);
|
|
|
|
/* debug feature area which records recovery activity */
|
|
sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev));
|
|
dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec));
|
|
if (!dbf->rec)
|
|
goto err_out;
|
|
|
|
/* debug feature area which records HBA (FSF and QDIO) conditions */
|
|
sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev));
|
|
dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba));
|
|
if (!dbf->hba)
|
|
goto err_out;
|
|
|
|
/* debug feature area which records payload info */
|
|
sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev));
|
|
dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay));
|
|
if (!dbf->pay)
|
|
goto err_out;
|
|
|
|
/* debug feature area which records SAN command failures and recovery */
|
|
sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev));
|
|
dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san));
|
|
if (!dbf->san)
|
|
goto err_out;
|
|
|
|
/* debug feature area which records SCSI command failures and recovery */
|
|
sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev));
|
|
dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi));
|
|
if (!dbf->scsi)
|
|
goto err_out;
|
|
|
|
adapter->dbf = dbf;
|
|
|
|
return 0;
|
|
err_out:
|
|
zfcp_dbf_unregister(dbf);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
|
|
* @adapter: pointer to adapter for which debug features should be unregistered
|
|
*/
|
|
void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter)
|
|
{
|
|
struct zfcp_dbf *dbf = adapter->dbf;
|
|
|
|
adapter->dbf = NULL;
|
|
zfcp_dbf_unregister(dbf);
|
|
}
|
|
|