| /* |
| * |
| * linux/drivers/s390/scsi/zfcp_scsi.c |
| * |
| * FCP adapter driver for IBM eServer zSeries |
| * |
| * (C) Copyright IBM Corp. 2002, 2004 |
| * |
| * Author(s): Martin Peschke <mpeschke@de.ibm.com> |
| * Raimund Schroeder <raimund.schroeder@de.ibm.com> |
| * Aron Zeh |
| * Wolfgang Taphorn |
| * Stefan Bader <stefan.bader@de.ibm.com> |
| * Heiko Carstens <heiko.carstens@de.ibm.com> |
| * Andreas Herrmann <aherrman@de.ibm.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2, or (at your option) |
| * any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #define ZFCP_LOG_AREA ZFCP_LOG_AREA_SCSI |
| |
| #define ZFCP_SCSI_REVISION "$Revision: 1.74 $" |
| |
| #include "zfcp_ext.h" |
| |
| static void zfcp_scsi_slave_destroy(struct scsi_device *sdp); |
| static int zfcp_scsi_slave_alloc(struct scsi_device *sdp); |
| static int zfcp_scsi_slave_configure(struct scsi_device *sdp); |
| static int zfcp_scsi_queuecommand(struct scsi_cmnd *, |
| void (*done) (struct scsi_cmnd *)); |
| static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); |
| static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); |
| static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *); |
| static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); |
| static int zfcp_task_management_function(struct zfcp_unit *, u8); |
| |
| static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t, |
| scsi_lun_t); |
| static struct zfcp_port *zfcp_port_lookup(struct zfcp_adapter *, int, |
| scsi_id_t); |
| |
| static struct device_attribute *zfcp_sysfs_sdev_attrs[]; |
| |
| struct scsi_transport_template *zfcp_transport_template; |
| |
| struct zfcp_data zfcp_data = { |
| .scsi_host_template = { |
| name: ZFCP_NAME, |
| proc_name: "zfcp", |
| proc_info: NULL, |
| detect: NULL, |
| slave_alloc: zfcp_scsi_slave_alloc, |
| slave_configure: zfcp_scsi_slave_configure, |
| slave_destroy: zfcp_scsi_slave_destroy, |
| queuecommand: zfcp_scsi_queuecommand, |
| eh_abort_handler: zfcp_scsi_eh_abort_handler, |
| eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler, |
| eh_bus_reset_handler: zfcp_scsi_eh_bus_reset_handler, |
| eh_host_reset_handler: zfcp_scsi_eh_host_reset_handler, |
| /* FIXME(openfcp): Tune */ |
| can_queue: 4096, |
| this_id: 0, |
| /* |
| * FIXME: |
| * one less? can zfcp_create_sbale cope with it? |
| */ |
| sg_tablesize: ZFCP_MAX_SBALES_PER_REQ, |
| cmd_per_lun: 1, |
| unchecked_isa_dma: 0, |
| use_clustering: 1, |
| sdev_attrs: zfcp_sysfs_sdev_attrs, |
| }, |
| .driver_version = ZFCP_VERSION, |
| /* rest initialised with zeros */ |
| }; |
| |
| /* Find start of Response Information in FCP response unit*/ |
| char * |
| zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) |
| { |
| char *fcp_rsp_info_ptr; |
| |
| fcp_rsp_info_ptr = |
| (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); |
| |
| return fcp_rsp_info_ptr; |
| } |
| |
| /* Find start of Sense Information in FCP response unit*/ |
| char * |
| zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu) |
| { |
| char *fcp_sns_info_ptr; |
| |
| fcp_sns_info_ptr = |
| (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu)); |
| if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid) |
| fcp_sns_info_ptr = (char *) fcp_sns_info_ptr + |
| fcp_rsp_iu->fcp_rsp_len; |
| |
| return fcp_sns_info_ptr; |
| } |
| |
| fcp_dl_t * |
| zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd) |
| { |
| int additional_length = fcp_cmd->add_fcp_cdb_length << 2; |
| fcp_dl_t *fcp_dl_addr; |
| |
| fcp_dl_addr = (fcp_dl_t *) |
| ((unsigned char *) fcp_cmd + |
| sizeof (struct fcp_cmnd_iu) + additional_length); |
| /* |
| * fcp_dl_addr = start address of fcp_cmnd structure + |
| * size of fixed part + size of dynamically sized add_dcp_cdb field |
| * SEE FCP-2 documentation |
| */ |
| return fcp_dl_addr; |
| } |
| |
| fcp_dl_t |
| zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd) |
| { |
| return *zfcp_get_fcp_dl_ptr(fcp_cmd); |
| } |
| |
| void |
| zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl) |
| { |
| *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl; |
| } |
| |
| /* |
| * note: it's a bit-or operation not an assignment |
| * regarding the specified byte |
| */ |
| static inline void |
| set_byte(u32 * result, char status, char pos) |
| { |
| *result |= status << (pos * 8); |
| } |
| |
| void |
| set_host_byte(u32 * result, char status) |
| { |
| set_byte(result, status, 2); |
| } |
| |
| void |
| set_driver_byte(u32 * result, char status) |
| { |
| set_byte(result, status, 3); |
| } |
| |
| /* |
| * function: zfcp_scsi_slave_alloc |
| * |
| * purpose: |
| * |
| * returns: |
| */ |
| |
| static int |
| zfcp_scsi_slave_alloc(struct scsi_device *sdp) |
| { |
| struct zfcp_adapter *adapter; |
| struct zfcp_unit *unit; |
| unsigned long flags; |
| int retval = -ENODEV; |
| |
| adapter = (struct zfcp_adapter *) sdp->host->hostdata[0]; |
| if (!adapter) |
| goto out; |
| |
| read_lock_irqsave(&zfcp_data.config_lock, flags); |
| unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun); |
| if (unit) { |
| sdp->hostdata = unit; |
| unit->device = sdp; |
| zfcp_unit_get(unit); |
| retval = 0; |
| } |
| read_unlock_irqrestore(&zfcp_data.config_lock, flags); |
| out: |
| return retval; |
| } |
| |
| /* |
| * function: zfcp_scsi_slave_destroy |
| * |
| * purpose: |
| * |
| * returns: |
| */ |
| |
| static void |
| zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) |
| { |
| struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; |
| |
| if (unit) { |
| sdpnt->hostdata = NULL; |
| unit->device = NULL; |
| zfcp_unit_put(unit); |
| } else { |
| ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " |
| "address %p\n", sdpnt); |
| } |
| } |
| |
| /* |
| * called from scsi midlayer to allow finetuning of a device. |
| */ |
| static int |
| zfcp_scsi_slave_configure(struct scsi_device *sdp) |
| { |
| if (sdp->tagged_supported) |
| scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN); |
| else |
| scsi_adjust_queue_depth(sdp, 0, 1); |
| return 0; |
| } |
| |
| /** |
| * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function |
| * @scpnt: pointer to struct scsi_cmnd where result is set |
| * @result: result to be set in scpnt (e.g. DID_ERROR) |
| */ |
| static void |
| zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) |
| { |
| set_host_byte(&scpnt->result, result); |
| zfcp_cmd_dbf_event_scsi("failing", scpnt); |
| /* return directly */ |
| scpnt->scsi_done(scpnt); |
| } |
| |
| /** |
| * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and |
| * zfcp_scsi_command_sync |
| * @adapter: adapter where scsi command is issued |
| * @unit: unit to which scsi command is sent |
| * @scpnt: scsi command to be sent |
| * @timer: timer to be started if request is successfully initiated |
| * |
| * Note: In scsi_done function must be set in scpnt. |
| */ |
| int |
| zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit, |
| struct scsi_cmnd *scpnt, struct timer_list *timer) |
| { |
| int tmp; |
| int retval; |
| |
| retval = 0; |
| |
| BUG_ON((adapter == NULL) || (adapter != unit->port->adapter)); |
| BUG_ON(scpnt->scsi_done == NULL); |
| |
| if (unlikely(NULL == unit)) { |
| zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); |
| goto out; |
| } |
| |
| if (unlikely( |
| atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) || |
| !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) { |
| ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port " |
| "0x%016Lx on adapter %s\n", |
| unit->fcp_lun, unit->port->wwpn, |
| zfcp_get_busid_by_adapter(adapter)); |
| zfcp_scsi_command_fail(scpnt, DID_ERROR); |
| goto out; |
| } |
| |
| if (unlikely( |
| !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) { |
| ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx " |
| "on port 0x%016Lx in recovery\n", |
| zfcp_get_busid_by_unit(unit), |
| unit->fcp_lun, unit->port->wwpn); |
| retval = SCSI_MLQUEUE_DEVICE_BUSY; |
| goto out; |
| } |
| |
| tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer, |
| ZFCP_REQ_AUTO_CLEANUP); |
| |
| if (unlikely(tmp < 0)) { |
| ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n"); |
| retval = SCSI_MLQUEUE_HOST_BUSY; |
| } |
| |
| out: |
| return retval; |
| } |
| |
| void |
| zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt) |
| { |
| struct completion *wait = (struct completion *) scpnt->SCp.ptr; |
| complete(wait); |
| } |
| |
| |
| /** |
| * zfcp_scsi_command_sync - send a SCSI command and wait for completion |
| * @unit: unit where command is sent to |
| * @scpnt: scsi command to be sent |
| * @timer: timer to be started if request is successfully initiated |
| * Return: 0 |
| * |
| * Errors are indicated in scpnt->result |
| */ |
| int |
| zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt, |
| struct timer_list *timer) |
| { |
| int ret; |
| DECLARE_COMPLETION(wait); |
| |
| scpnt->SCp.ptr = (void *) &wait; /* silent re-use */ |
| scpnt->scsi_done = zfcp_scsi_command_sync_handler; |
| ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer); |
| if (ret == 0) |
| wait_for_completion(&wait); |
| |
| scpnt->SCp.ptr = NULL; |
| |
| return 0; |
| } |
| |
| /* |
| * function: zfcp_scsi_queuecommand |
| * |
| * purpose: enqueues a SCSI command to the specified target device |
| * |
| * returns: 0 - success, SCSI command enqueued |
| * !0 - failure |
| */ |
| int |
| zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, |
| void (*done) (struct scsi_cmnd *)) |
| { |
| struct zfcp_unit *unit; |
| struct zfcp_adapter *adapter; |
| |
| /* reset the status for this request */ |
| scpnt->result = 0; |
| scpnt->host_scribble = NULL; |
| scpnt->scsi_done = done; |
| |
| /* |
| * figure out adapter and target device |
| * (stored there by zfcp_scsi_slave_alloc) |
| */ |
| adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; |
| unit = (struct zfcp_unit *) scpnt->device->hostdata; |
| |
| return zfcp_scsi_command_async(adapter, unit, scpnt, NULL); |
| } |
| |
| /* |
| * function: zfcp_unit_lookup |
| * |
| * purpose: |
| * |
| * returns: |
| * |
| * context: |
| */ |
| static struct zfcp_unit * |
| zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id, |
| scsi_lun_t lun) |
| { |
| struct zfcp_port *port; |
| struct zfcp_unit *unit, *retval = NULL; |
| |
| list_for_each_entry(port, &adapter->port_list_head, list) { |
| if (id != port->scsi_id) |
| continue; |
| list_for_each_entry(unit, &port->unit_list_head, list) { |
| if (lun == unit->scsi_lun) { |
| retval = unit; |
| goto out; |
| } |
| } |
| } |
| out: |
| return retval; |
| } |
| |
| static struct zfcp_port * |
| zfcp_port_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id) |
| { |
| struct zfcp_port *port; |
| |
| list_for_each_entry(port, &adapter->port_list_head, list) { |
| if (id == port->scsi_id) |
| return port; |
| } |
| return (struct zfcp_port *) NULL; |
| } |
| |
| /* |
| * function: zfcp_scsi_eh_abort_handler |
| * |
| * purpose: tries to abort the specified (timed out) SCSI command |
| * |
| * note: We do not need to care for a SCSI command which completes |
| * normally but late during this abort routine runs. |
| * We are allowed to return late commands to the SCSI stack. |
| * It tracks the state of commands and will handle late commands. |
| * (Usually, the normal completion of late commands is ignored with |
| * respect to the running abort operation. Grep for 'done_late' |
| * in the SCSI stacks sources.) |
| * |
| * returns: SUCCESS - command has been aborted and cleaned up in internal |
| * bookkeeping, |
| * SCSI stack won't be called for aborted command |
| * FAILED - otherwise |
| */ |
| int |
| zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) |
| { |
| int retval = SUCCESS; |
| struct zfcp_fsf_req *new_fsf_req, *old_fsf_req; |
| struct zfcp_adapter *adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; |
| struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; |
| struct zfcp_port *port = unit->port; |
| struct Scsi_Host *scsi_host = scpnt->device->host; |
| union zfcp_req_data *req_data = NULL; |
| unsigned long flags; |
| u32 status = 0; |
| |
| /* the components of a abort_dbf record (fixed size record) */ |
| u64 dbf_scsi_cmnd = (unsigned long) scpnt; |
| char dbf_opcode[ZFCP_ABORT_DBF_LENGTH]; |
| wwn_t dbf_wwn = port->wwpn; |
| fcp_lun_t dbf_fcp_lun = unit->fcp_lun; |
| u64 dbf_retries = scpnt->retries; |
| u64 dbf_allowed = scpnt->allowed; |
| u64 dbf_timeout = 0; |
| u64 dbf_fsf_req = 0; |
| u64 dbf_fsf_status = 0; |
| u64 dbf_fsf_qual[2] = { 0, 0 }; |
| char dbf_result[ZFCP_ABORT_DBF_LENGTH] = "##undef"; |
| |
| memset(dbf_opcode, 0, ZFCP_ABORT_DBF_LENGTH); |
| memcpy(dbf_opcode, |
| scpnt->cmnd, |
| min(scpnt->cmd_len, (unsigned char) ZFCP_ABORT_DBF_LENGTH)); |
| |
| ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n", |
| scpnt, zfcp_get_busid_by_adapter(adapter)); |
| |
| spin_unlock_irq(scsi_host->host_lock); |
| |
| /* |
| * Race condition between normal (late) completion and abort has |
| * to be avoided. |
| * The entirity of all accesses to scsi_req have to be atomic. |
| * scsi_req is usually part of the fsf_req and thus we block the |
| * release of fsf_req as long as we need to access scsi_req. |
| */ |
| write_lock_irqsave(&adapter->abort_lock, flags); |
| |
| /* |
| * Check whether command has just completed and can not be aborted. |
| * Even if the command has just been completed late, we can access |
| * scpnt since the SCSI stack does not release it at least until |
| * this routine returns. (scpnt is parameter passed to this routine |
| * and must not disappear during abort even on late completion.) |
| */ |
| req_data = (union zfcp_req_data *) scpnt->host_scribble; |
| /* DEBUG */ |
| ZFCP_LOG_DEBUG("req_data=%p\n", req_data); |
| if (!req_data) { |
| ZFCP_LOG_DEBUG("late command completion overtook abort\n"); |
| /* |
| * That's it. |
| * Do not initiate abort but return SUCCESS. |
| */ |
| write_unlock_irqrestore(&adapter->abort_lock, flags); |
| retval = SUCCESS; |
| strncpy(dbf_result, "##late1", ZFCP_ABORT_DBF_LENGTH); |
| goto out; |
| } |
| |
| /* Figure out which fsf_req needs to be aborted. */ |
| old_fsf_req = req_data->send_fcp_command_task.fsf_req; |
| |
| dbf_fsf_req = (unsigned long) old_fsf_req; |
| dbf_timeout = |
| (jiffies - req_data->send_fcp_command_task.start_jiffies) / HZ; |
| |
| ZFCP_LOG_DEBUG("old_fsf_req=%p\n", old_fsf_req); |
| if (!old_fsf_req) { |
| write_unlock_irqrestore(&adapter->abort_lock, flags); |
| ZFCP_LOG_NORMAL("bug: no old fsf request found\n"); |
| ZFCP_LOG_NORMAL("req_data:\n"); |
| ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL, |
| (char *) req_data, sizeof (union zfcp_req_data)); |
| ZFCP_LOG_NORMAL("scsi_cmnd:\n"); |
| ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_NORMAL, |
| (char *) scpnt, sizeof (struct scsi_cmnd)); |
| retval = FAILED; |
| strncpy(dbf_result, "##bug:r", ZFCP_ABORT_DBF_LENGTH); |
| goto out; |
| } |
| old_fsf_req->data.send_fcp_command_task.scsi_cmnd = NULL; |
| /* mark old request as being aborted */ |
| old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING; |
| /* |
| * We have to collect all information (e.g. unit) needed by |
| * zfcp_fsf_abort_fcp_command before calling that routine |
| * since that routine is not allowed to access |
| * fsf_req which it is going to abort. |
| * This is because of we need to release fsf_req_list_lock |
| * before calling zfcp_fsf_abort_fcp_command. |
| * Since this lock will not be held, fsf_req may complete |
| * late and may be released meanwhile. |
| */ |
| ZFCP_LOG_DEBUG("unit 0x%016Lx (%p)\n", unit->fcp_lun, unit); |
| |
| /* |
| * We block (call schedule) |
| * That's why we must release the lock and enable the |
| * interrupts before. |
| * On the other hand we do not need the lock anymore since |
| * all critical accesses to scsi_req are done. |
| */ |
| write_unlock_irqrestore(&adapter->abort_lock, flags); |
| /* call FSF routine which does the abort */ |
| new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req, |
| adapter, unit, 0); |
| ZFCP_LOG_DEBUG("new_fsf_req=%p\n", new_fsf_req); |
| if (!new_fsf_req) { |
| retval = FAILED; |
| ZFCP_LOG_NORMAL("error: initiation of Abort FCP Cmnd " |
| "failed\n"); |
| strncpy(dbf_result, "##nores", ZFCP_ABORT_DBF_LENGTH); |
| goto out; |
| } |
| |
| /* wait for completion of abort */ |
| ZFCP_LOG_DEBUG("waiting for cleanup...\n"); |
| #if 1 |
| /* |
| * FIXME: |
| * copying zfcp_fsf_req_wait_and_cleanup code is not really nice |
| */ |
| __wait_event(new_fsf_req->completion_wq, |
| new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED); |
| status = new_fsf_req->status; |
| dbf_fsf_status = new_fsf_req->qtcb->header.fsf_status; |
| /* |
| * Ralphs special debug load provides timestamps in the FSF |
| * status qualifier. This might be specified later if being |
| * useful for debugging aborts. |
| */ |
| dbf_fsf_qual[0] = |
| *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[0]; |
| dbf_fsf_qual[1] = |
| *(u64 *) & new_fsf_req->qtcb->header.fsf_status_qual.word[2]; |
| zfcp_fsf_req_free(new_fsf_req); |
| #else |
| retval = zfcp_fsf_req_wait_and_cleanup(new_fsf_req, |
| ZFCP_UNINTERRUPTIBLE, &status); |
| #endif |
| ZFCP_LOG_DEBUG("Waiting for cleanup complete, status=0x%x\n", status); |
| /* status should be valid since signals were not permitted */ |
| if (status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) { |
| retval = SUCCESS; |
| strncpy(dbf_result, "##succ", ZFCP_ABORT_DBF_LENGTH); |
| } else if (status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) { |
| retval = SUCCESS; |
| strncpy(dbf_result, "##late2", ZFCP_ABORT_DBF_LENGTH); |
| } else { |
| retval = FAILED; |
| strncpy(dbf_result, "##fail", ZFCP_ABORT_DBF_LENGTH); |
| } |
| |
| out: |
| debug_event(adapter->abort_dbf, 1, &dbf_scsi_cmnd, sizeof (u64)); |
| debug_event(adapter->abort_dbf, 1, &dbf_opcode, ZFCP_ABORT_DBF_LENGTH); |
| debug_event(adapter->abort_dbf, 1, &dbf_wwn, sizeof (wwn_t)); |
| debug_event(adapter->abort_dbf, 1, &dbf_fcp_lun, sizeof (fcp_lun_t)); |
| debug_event(adapter->abort_dbf, 1, &dbf_retries, sizeof (u64)); |
| debug_event(adapter->abort_dbf, 1, &dbf_allowed, sizeof (u64)); |
| debug_event(adapter->abort_dbf, 1, &dbf_timeout, sizeof (u64)); |
| debug_event(adapter->abort_dbf, 1, &dbf_fsf_req, sizeof (u64)); |
| debug_event(adapter->abort_dbf, 1, &dbf_fsf_status, sizeof (u64)); |
| debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[0], sizeof (u64)); |
| debug_event(adapter->abort_dbf, 1, &dbf_fsf_qual[1], sizeof (u64)); |
| debug_text_event(adapter->abort_dbf, 1, dbf_result); |
| |
| spin_lock_irq(scsi_host->host_lock); |
| return retval; |
| } |
| |
| /* |
| * function: zfcp_scsi_eh_device_reset_handler |
| * |
| * purpose: |
| * |
| * returns: |
| */ |
| int |
| zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) |
| { |
| int retval; |
| struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata; |
| struct Scsi_Host *scsi_host = scpnt->device->host; |
| |
| spin_unlock_irq(scsi_host->host_lock); |
| |
| if (!unit) { |
| ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n"); |
| retval = SUCCESS; |
| goto out; |
| } |
| ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun); |
| |
| /* |
| * If we do not know whether the unit supports 'logical unit reset' |
| * then try 'logical unit reset' and proceed with 'target reset' |
| * if 'logical unit reset' fails. |
| * If the unit is known not to support 'logical unit reset' then |
| * skip 'logical unit reset' and try 'target reset' immediately. |
| */ |
| if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, |
| &unit->status)) { |
| retval = |
| zfcp_task_management_function(unit, FCP_LOGICAL_UNIT_RESET); |
| if (retval) { |
| ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit); |
| if (retval == -ENOTSUPP) |
| atomic_set_mask |
| (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET, |
| &unit->status); |
| /* fall through and try 'target reset' next */ |
| } else { |
| ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n", |
| unit); |
| /* avoid 'target reset' */ |
| retval = SUCCESS; |
| goto out; |
| } |
| } |
| retval = zfcp_task_management_function(unit, FCP_TARGET_RESET); |
| if (retval) { |
| ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit); |
| retval = FAILED; |
| } else { |
| ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit); |
| retval = SUCCESS; |
| } |
| out: |
| spin_lock_irq(scsi_host->host_lock); |
| return retval; |
| } |
| |
| static int |
| zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags) |
| { |
| struct zfcp_adapter *adapter = unit->port->adapter; |
| int retval; |
| int status; |
| struct zfcp_fsf_req *fsf_req; |
| |
| /* issue task management function */ |
| fsf_req = zfcp_fsf_send_fcp_command_task_management |
| (adapter, unit, tm_flags, 0); |
| if (!fsf_req) { |
| ZFCP_LOG_INFO("error: creation of task management request " |
| "failed for unit 0x%016Lx on port 0x%016Lx on " |
| "adapter %s\n", unit->fcp_lun, unit->port->wwpn, |
| zfcp_get_busid_by_adapter(adapter)); |
| retval = -ENOMEM; |
| goto out; |
| } |
| |
| retval = zfcp_fsf_req_wait_and_cleanup(fsf_req, |
| ZFCP_UNINTERRUPTIBLE, &status); |
| /* |
| * check completion status of task management function |
| * (status should always be valid since no signals permitted) |
| */ |
| if (status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) |
| retval = -EIO; |
| else if (status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) |
| retval = -ENOTSUPP; |
| else |
| retval = 0; |
| out: |
| return retval; |
| } |
| |
| /* |
| * function: zfcp_scsi_eh_bus_reset_handler |
| * |
| * purpose: |
| * |
| * returns: |
| */ |
| int |
| zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt) |
| { |
| int retval = 0; |
| struct zfcp_unit *unit; |
| struct Scsi_Host *scsi_host = scpnt->device->host; |
| |
| spin_unlock_irq(scsi_host->host_lock); |
| |
| unit = (struct zfcp_unit *) scpnt->device->hostdata; |
| ZFCP_LOG_NORMAL("bus reset because of problems with " |
| "unit 0x%016Lx\n", unit->fcp_lun); |
| zfcp_erp_adapter_reopen(unit->port->adapter, 0); |
| zfcp_erp_wait(unit->port->adapter); |
| retval = SUCCESS; |
| |
| spin_lock_irq(scsi_host->host_lock); |
| return retval; |
| } |
| |
| /* |
| * function: zfcp_scsi_eh_host_reset_handler |
| * |
| * purpose: |
| * |
| * returns: |
| */ |
| int |
| zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) |
| { |
| int retval = 0; |
| struct zfcp_unit *unit; |
| struct Scsi_Host *scsi_host = scpnt->device->host; |
| |
| spin_unlock_irq(scsi_host->host_lock); |
| |
| unit = (struct zfcp_unit *) scpnt->device->hostdata; |
| ZFCP_LOG_NORMAL("host reset because of problems with " |
| "unit 0x%016Lx\n", unit->fcp_lun); |
| zfcp_erp_adapter_reopen(unit->port->adapter, 0); |
| zfcp_erp_wait(unit->port->adapter); |
| retval = SUCCESS; |
| |
| spin_lock_irq(scsi_host->host_lock); |
| return retval; |
| } |
| |
| /* |
| * function: |
| * |
| * purpose: |
| * |
| * returns: |
| */ |
| int |
| zfcp_adapter_scsi_register(struct zfcp_adapter *adapter) |
| { |
| int retval = 0; |
| static unsigned int unique_id = 0; |
| |
| /* register adapter as SCSI host with mid layer of SCSI stack */ |
| adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template, |
| sizeof (struct zfcp_adapter *)); |
| if (!adapter->scsi_host) { |
| ZFCP_LOG_NORMAL("error: registration with SCSI stack failed " |
| "for adapter %s ", |
| zfcp_get_busid_by_adapter(adapter)); |
| retval = -EIO; |
| goto out; |
| } |
| ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host); |
| |
| /* tell the SCSI stack some characteristics of this adapter */ |
| adapter->scsi_host->max_id = 1; |
| adapter->scsi_host->max_lun = 1; |
| adapter->scsi_host->max_channel = 0; |
| adapter->scsi_host->unique_id = unique_id++; /* FIXME */ |
| adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH; |
| adapter->scsi_host->transportt = zfcp_transport_template; |
| /* |
| * Reverse mapping of the host number to avoid race condition |
| */ |
| adapter->scsi_host_no = adapter->scsi_host->host_no; |
| |
| /* |
| * save a pointer to our own adapter data structure within |
| * hostdata field of SCSI host data structure |
| */ |
| adapter->scsi_host->hostdata[0] = (unsigned long) adapter; |
| |
| if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { |
| scsi_host_put(adapter->scsi_host); |
| retval = -EIO; |
| goto out; |
| } |
| atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); |
| out: |
| return retval; |
| } |
| |
| /* |
| * function: |
| * |
| * purpose: |
| * |
| * returns: |
| */ |
| void |
| zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter) |
| { |
| struct Scsi_Host *shost; |
| |
| shost = adapter->scsi_host; |
| if (!shost) |
| return; |
| scsi_remove_host(shost); |
| scsi_host_put(shost); |
| adapter->scsi_host = NULL; |
| adapter->scsi_host_no = 0; |
| atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status); |
| |
| return; |
| } |
| |
| |
| void |
| zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter) |
| { |
| adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler; |
| adapter->scsi_er_timer.data = (unsigned long) adapter; |
| adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT; |
| add_timer(&adapter->scsi_er_timer); |
| } |
| |
| /* |
| * Support functions for FC transport class |
| */ |
| static void |
| zfcp_get_port_id(struct scsi_target *starget) |
| { |
| struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; |
| struct zfcp_port *port; |
| unsigned long flags; |
| |
| read_lock_irqsave(&zfcp_data.config_lock, flags); |
| port = zfcp_port_lookup(adapter, starget->channel, starget->id); |
| if (port) |
| fc_starget_port_id(starget) = port->d_id; |
| else |
| fc_starget_port_id(starget) = -1; |
| read_unlock_irqrestore(&zfcp_data.config_lock, flags); |
| } |
| |
| static void |
| zfcp_get_port_name(struct scsi_target *starget) |
| { |
| struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; |
| struct zfcp_port *port; |
| unsigned long flags; |
| |
| read_lock_irqsave(&zfcp_data.config_lock, flags); |
| port = zfcp_port_lookup(adapter, starget->channel, starget->id); |
| if (port) |
| fc_starget_port_name(starget) = port->wwpn; |
| else |
| fc_starget_port_name(starget) = -1; |
| read_unlock_irqrestore(&zfcp_data.config_lock, flags); |
| } |
| |
| static void |
| zfcp_get_node_name(struct scsi_target *starget) |
| { |
| struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| struct zfcp_adapter *adapter = (struct zfcp_adapter *)shost->hostdata[0]; |
| struct zfcp_port *port; |
| unsigned long flags; |
| |
| read_lock_irqsave(&zfcp_data.config_lock, flags); |
| port = zfcp_port_lookup(adapter, starget->channel, starget->id); |
| if (port) |
| fc_starget_node_name(starget) = port->wwnn; |
| else |
| fc_starget_node_name(starget) = -1; |
| read_unlock_irqrestore(&zfcp_data.config_lock, flags); |
| } |
| |
| struct fc_function_template zfcp_transport_functions = { |
| .get_starget_port_id = zfcp_get_port_id, |
| .get_starget_port_name = zfcp_get_port_name, |
| .get_starget_node_name = zfcp_get_node_name, |
| .show_starget_port_id = 1, |
| .show_starget_port_name = 1, |
| .show_starget_node_name = 1, |
| }; |
| |
| /** |
| * ZFCP_DEFINE_SCSI_ATTR |
| * @_name: name of show attribute |
| * @_format: format string |
| * @_value: value to print |
| * |
| * Generates attribute for a unit. |
| */ |
| #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \ |
| static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, \ |
| char *buf) \ |
| { \ |
| struct scsi_device *sdev; \ |
| struct zfcp_unit *unit; \ |
| \ |
| sdev = to_scsi_device(dev); \ |
| unit = sdev->hostdata; \ |
| return sprintf(buf, _format, _value); \ |
| } \ |
| \ |
| static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL); |
| |
| ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit)); |
| ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn); |
| ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun); |
| |
| static struct device_attribute *zfcp_sysfs_sdev_attrs[] = { |
| &dev_attr_fcp_lun, |
| &dev_attr_wwpn, |
| &dev_attr_hba_id, |
| NULL |
| }; |
| |
| #undef ZFCP_LOG_AREA |