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kernel_samsung_sm7125/drivers/s390/scsi/zfcp_scsi.c

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/*
*
* 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;
}
int
zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
{
int rc;
struct Scsi_Host *scsi_host = scpnt->device->host;
spin_lock_irq(scsi_host->host_lock);
rc = __zfcp_scsi_eh_abort_handler(scpnt);
spin_unlock_irq(scsi_host->host_lock);
return rc;
}
/*
* 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;
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:
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