- short blurb on using SCSI support as a module.
scsi_mid_low_api.txt
- info on API between SCSI layer and low level drivers
+scsi_eh.txt
+ - info on SCSI midlayer error handling infrastructure
st.txt
- info on scsi tape driver
sym53c500_cs.txt
--- /dev/null
+
+SCSI EH
+======================================
+
+ This document describes SCSI midlayer error handling infrastructure.
+Please refer to Documentation/scsi/scsi_mid_low_api.txt for more
+information regarding SCSI midlayer.
+
+TABLE OF CONTENTS
+
+[1] How SCSI commands travel through the midlayer and to EH
+ [1-1] struct scsi_cmnd
+ [1-2] How do scmd's get completed?
+ [1-2-1] Completing a scmd w/ scsi_done
+ [1-2-2] Completing a scmd w/ timeout
+ [1-3] How EH takes over
+[2] How SCSI EH works
+ [2-1] EH through fine-grained callbacks
+ [2-1-1] Overview
+ [2-1-2] Flow of scmds through EH
+ [2-1-3] Flow of control
+ [2-2] EH through hostt->eh_strategy_handler()
+ [2-2-1] Pre hostt->eh_strategy_handler() SCSI midlayer conditions
+ [2-2-2] Post hostt->eh_strategy_handler() SCSI midlayer conditions
+ [2-2-3] Things to consider
+
+
+[1] How SCSI commands travel through the midlayer and to EH
+
+[1-1] struct scsi_cmnd
+
+ Each SCSI command is represented with struct scsi_cmnd (== scmd). A
+scmd has two list_head's to link itself into lists. The two are
+scmd->list and scmd->eh_entry. The former is used for free list or
+per-device allocated scmd list and not of much interest to this EH
+discussion. The latter is used for completion and EH lists and unless
+otherwise stated scmds are always linked using scmd->eh_entry in this
+discussion.
+
+
+[1-2] How do scmd's get completed?
+
+ Once LLDD gets hold of a scmd, either the LLDD will complete the
+command by calling scsi_done callback passed from midlayer when
+invoking hostt->queuecommand() or SCSI midlayer will time it out.
+
+
+[1-2-1] Completing a scmd w/ scsi_done
+
+ For all non-EH commands, scsi_done() is the completion callback. It
+does the following.
+
+ 1. Delete timeout timer. If it fails, it means that timeout timer
+ has expired and is going to finish the command. Just return.
+
+ 2. Link scmd to per-cpu scsi_done_q using scmd->en_entry
+
+ 3. Raise SCSI_SOFTIRQ
+
+ SCSI_SOFTIRQ handler scsi_softirq calls scsi_decide_disposition() to
+determine what to do with the command. scsi_decide_disposition()
+looks at the scmd->result value and sense data to determine what to do
+with the command.
+
+ - SUCCESS
+ scsi_finish_command() is invoked for the command. The
+ function does some maintenance choirs and notify completion by
+ calling scmd->done() callback, which, for fs requests, would
+ be HLD completion callback - sd:sd_rw_intr, sr:rw_intr,
+ st:st_intr.
+
+ - NEEDS_RETRY
+ - ADD_TO_MLQUEUE
+ scmd is requeued to blk queue.
+
+ - otherwise
+ scsi_eh_scmd_add(scmd, 0) is invoked for the command. See
+ [1-3] for details of this funciton.
+
+
+[1-2-2] Completing a scmd w/ timeout
+
+ The timeout handler is scsi_times_out(). When a timeout occurs, this
+function
+
+ 1. invokes optional hostt->eh_timedout() callback. Return value can
+ be one of
+
+ - EH_HANDLED
+ This indicates that eh_timedout() dealt with the timeout. The
+ scmd is passed to __scsi_done() and thus linked into per-cpu
+ scsi_done_q. Normal command completion described in [1-2-1]
+ follows.
+
+ - EH_RESET_TIMER
+ This indicates that more time is required to finish the
+ command. Timer is restarted. This action is counted as a
+ retry and only allowed scmd->allowed + 1(!) times. Once the
+ limit is reached, action for EH_NOT_HANDLED is taken instead.
+
+ *NOTE* This action is racy as the LLDD could finish the scmd
+ after the timeout has expired but before it's added back. In
+ such cases, scsi_done() would think that timeout has occurred
+ and return without doing anything. We lose completion and the
+ command will time out again.
+
+ - EH_NOT_HANDLED
+ This is the same as when eh_timedout() callback doesn't exist.
+ Step #2 is taken.
+
+ 2. scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD) is invoked for the
+ command. See [1-3] for more information.
+
+
+[1-3] How EH takes over
+
+ scmds enter EH via scsi_eh_scmd_add(), which does the following.
+
+ 1. Turns on scmd->eh_eflags as requested. It's 0 for error
+ completions and SCSI_EH_CANCEL_CMD for timeouts.
+
+ 2. Links scmd->eh_entry to shost->eh_cmd_q
+
+ 3. Sets SHOST_RECOVERY bit in shost->shost_state
+
+ 4. Increments shost->host_failed
+
+ 5. Wakes up SCSI EH thread if shost->host_busy == shost->host_failed
+
+ As can be seen above, once any scmd is added to shost->eh_cmd_q,
+SHOST_RECOVERY shost_state bit is turned on. This prevents any new
+scmd to be issued from blk queue to the host; eventually, all scmds on
+the host either complete normally, fail and get added to eh_cmd_q, or
+time out and get added to shost->eh_cmd_q.
+
+ If all scmds either complete or fail, the number of in-flight scmds
+becomes equal to the number of failed scmds - i.e. shost->host_busy ==
+shost->host_failed. This wakes up SCSI EH thread. So, once woken up,
+SCSI EH thread can expect that all in-flight commands have failed and
+are linked on shost->eh_cmd_q.
+
+ Note that this does not mean lower layers are quiescent. If a LLDD
+completed a scmd with error status, the LLDD and lower layers are
+assumed to forget about the scmd at that point. However, if a scmd
+has timed out, unless hostt->eh_timedout() made lower layers forget
+about the scmd, which currently no LLDD does, the command is still
+active as long as lower layers are concerned and completion could
+occur at any time. Of course, all such completions are ignored as the
+timer has already expired.
+
+ We'll talk about how SCSI EH takes actions to abort - make LLDD
+forget about - timed out scmds later.
+
+
+[2] How SCSI EH works
+
+ LLDD's can implement SCSI EH actions in one of the following two
+ways.
+
+ - Fine-grained EH callbacks
+ LLDD can implement fine-grained EH callbacks and let SCSI
+ midlayer drive error handling and call appropriate callbacks.
+ This will be dicussed further in [2-1].
+
+ - eh_strategy_handler() callback
+ This is one big callback which should perform whole error
+ handling. As such, it should do all choirs SCSI midlayer
+ performs during recovery. This will be discussed in [2-2].
+
+ Once recovery is complete, SCSI EH resumes normal operation by
+calling scsi_restart_operations(), which
+
+ 1. Checks if door locking is needed and locks door.
+
+ 2. Clears SHOST_RECOVERY shost_state bit
+
+ 3. Wakes up waiters on shost->host_wait. This occurs if someone
+ calls scsi_block_when_processing_errors() on the host.
+ (*QUESTION* why is it needed? All operations will be blocked
+ anyway after it reaches blk queue.)
+
+ 4. Kicks queues in all devices on the host in the asses
+
+
+[2-1] EH through fine-grained callbacks
+
+[2-1-1] Overview
+
+ If eh_strategy_handler() is not present, SCSI midlayer takes charge
+of driving error handling. EH's goals are two - make LLDD, host and
+device forget about timed out scmds and make them ready for new
+commands. A scmd is said to be recovered if the scmd is forgotten by
+lower layers and lower layers are ready to process or fail the scmd
+again.
+
+ To achieve these goals, EH performs recovery actions with increasing
+severity. Some actions are performed by issueing SCSI commands and
+others are performed by invoking one of the following fine-grained
+hostt EH callbacks. Callbacks may be omitted and omitted ones are
+considered to fail always.
+
+int (* eh_abort_handler)(struct scsi_cmnd *);
+int (* eh_device_reset_handler)(struct scsi_cmnd *);
+int (* eh_bus_reset_handler)(struct scsi_cmnd *);
+int (* eh_host_reset_handler)(struct scsi_cmnd *);
+
+ Higher-severity actions are taken only when lower-severity actions
+cannot recover some of failed scmds. Also, note that failure of the
+highest-severity action means EH failure and results in offlining of
+all unrecovered devices.
+
+ During recovery, the following rules are followed
+
+ - Recovery actions are performed on failed scmds on the to do list,
+ eh_work_q. If a recovery action succeeds for a scmd, recovered
+ scmds are removed from eh_work_q.
+
+ Note that single recovery action on a scmd can recover multiple
+ scmds. e.g. resetting a device recovers all failed scmds on the
+ device.
+
+ - Higher severity actions are taken iff eh_work_q is not empty after
+ lower severity actions are complete.
+
+ - EH reuses failed scmds to issue commands for recovery. For
+ timed-out scmds, SCSI EH ensures that LLDD forgets about a scmd
+ before reusing it for EH commands.
+
+ When a scmd is recovered, the scmd is moved from eh_work_q to EH
+local eh_done_q using scsi_eh_finish_cmd(). After all scmds are
+recovered (eh_work_q is empty), scsi_eh_flush_done_q() is invoked to
+either retry or error-finish (notify upper layer of failure) recovered
+scmds.
+
+ scmds are retried iff its sdev is still online (not offlined during
+EH), REQ_FAILFAST is not set and ++scmd->retries is less than
+scmd->allowed.
+
+
+[2-1-2] Flow of scmds through EH
+
+ 1. Error completion / time out
+ ACTION: scsi_eh_scmd_add() is invoked for scmd
+ - set scmd->eh_eflags
+ - add scmd to shost->eh_cmd_q
+ - set SHOST_RECOVERY
+ - shost->host_failed++
+ LOCKING: shost->host_lock
+
+ 2. EH starts
+ ACTION: move all scmds to EH's local eh_work_q. shost->eh_cmd_q
+ is cleared.
+ LOCKING: shost->host_lock (not strictly necessary, just for
+ consistency)
+
+ 3. scmd recovered
+ ACTION: scsi_eh_finish_cmd() is invoked to EH-finish scmd
+ - shost->host_failed--
+ - clear scmd->eh_eflags
+ - scsi_setup_cmd_retry()
+ - move from local eh_work_q to local eh_done_q
+ LOCKING: none
+
+ 4. EH completes
+ ACTION: scsi_eh_flush_done_q() retries scmds or notifies upper
+ layer of failure.
+ - scmd is removed from eh_done_q and scmd->eh_entry is cleared
+ - if retry is necessary, scmd is requeued using
+ scsi_queue_insert()
+ - otherwise, scsi_finish_command() is invoked for scmd
+ LOCKING: queue or finish function performs appropriate locking
+
+
+[2-1-3] Flow of control
+
+ EH through fine-grained callbacks start from scsi_unjam_host().
+
+<<scsi_unjam_host>>
+
+ 1. Lock shost->host_lock, splice_init shost->eh_cmd_q into local
+ eh_work_q and unlock host_lock. Note that shost->eh_cmd_q is
+ cleared by this action.
+
+ 2. Invoke scsi_eh_get_sense.
+
+ <<scsi_eh_get_sense>>
+
+ This action is taken for each error-completed
+ (!SCSI_EH_CANCEL_CMD) commands without valid sense data. Most
+ SCSI transports/LLDDs automatically acquire sense data on
+ command failures (autosense). Autosense is recommended for
+ performance reasons and as sense information could get out of
+ sync inbetween occurrence of CHECK CONDITION and this action.
+
+ Note that if autosense is not supported, scmd->sense_buffer
+ contains invalid sense data when error-completing the scmd
+ with scsi_done(). scsi_decide_disposition() always returns
+ FAILED in such cases thus invoking SCSI EH. When the scmd
+ reaches here, sense data is acquired and
+ scsi_decide_disposition() is called again.
+
+ 1. Invoke scsi_request_sense() which issues REQUEST_SENSE
+ command. If fails, no action. Note that taking no action
+ causes higher-severity recovery to be taken for the scmd.
+
+ 2. Invoke scsi_decide_disposition() on the scmd
+
+ - SUCCESS
+ scmd->retries is set to scmd->allowed preventing
+ scsi_eh_flush_done_q() from retrying the scmd and
+ scsi_eh_finish_cmd() is invoked.
+
+ - NEEDS_RETRY
+ scsi_eh_finish_cmd() invoked
+
+ - otherwise
+ No action.
+
+ 3. If !list_empty(&eh_work_q), invoke scsi_eh_abort_cmds().
+
+ <<scsi_eh_abort_cmds>>
+
+ This action is taken for each timed out command.
+ hostt->eh_abort_handler() is invoked for each scmd. The
+ handler returns SUCCESS if it has succeeded to make LLDD and
+ all related hardware forget about the scmd.
+
+ If a timedout scmd is successfully aborted and the sdev is
+ either offline or ready, scsi_eh_finish_cmd() is invoked for
+ the scmd. Otherwise, the scmd is left in eh_work_q for
+ higher-severity actions.
+
+ Note that both offline and ready status mean that the sdev is
+ ready to process new scmds, where processing also implies
+ immediate failing; thus, if a sdev is in one of the two
+ states, no further recovery action is needed.
+
+ Device readiness is tested using scsi_eh_tur() which issues
+ TEST_UNIT_READY command. Note that the scmd must have been
+ aborted successfully before reusing it for TEST_UNIT_READY.
+
+ 4. If !list_empty(&eh_work_q), invoke scsi_eh_ready_devs()
+
+ <<scsi_eh_ready_devs>>
+
+ This function takes four increasingly more severe measures to
+ make failed sdevs ready for new commands.
+
+ 1. Invoke scsi_eh_stu()
+
+ <<scsi_eh_stu>>
+
+ For each sdev which has failed scmds with valid sense data
+ of which scsi_check_sense()'s verdict is FAILED,
+ START_STOP_UNIT command is issued w/ start=1. Note that
+ as we explicitly choose error-completed scmds, it is known
+ that lower layers have forgotten about the scmd and we can
+ reuse it for STU.
+
+ If STU succeeds and the sdev is either offline or ready,
+ all failed scmds on the sdev are EH-finished with
+ scsi_eh_finish_cmd().
+
+ *NOTE* If hostt->eh_abort_handler() isn't implemented or
+ failed, we may still have timed out scmds at this point
+ and STU doesn't make lower layers forget about those
+ scmds. Yet, this function EH-finish all scmds on the sdev
+ if STU succeeds leaving lower layers in an inconsistent
+ state. It seems that STU action should be taken only when
+ a sdev has no timed out scmd.
+
+ 2. If !list_empty(&eh_work_q), invoke scsi_eh_bus_device_reset().
+
+ <<scsi_eh_bus_device_reset>>
+
+ This action is very similar to scsi_eh_stu() except that,
+ instead of issuing STU, hostt->eh_device_reset_handler()
+ is used. Also, as we're not issuing SCSI commands and
+ resetting clears all scmds on the sdev, there is no need
+ to choose error-completed scmds.
+
+ 3. If !list_empty(&eh_work_q), invoke scsi_eh_bus_reset()
+
+ <<scsi_eh_bus_reset>>
+
+ hostt->eh_bus_reset_handler() is invoked for each channel
+ with failed scmds. If bus reset succeeds, all failed
+ scmds on all ready or offline sdevs on the channel are
+ EH-finished.
+
+ 4. If !list_empty(&eh_work_q), invoke scsi_eh_host_reset()
+
+ <<scsi_eh_host_reset>>
+
+ This is the last resort. hostt->eh_host_reset_handler()
+ is invoked. If host reset succeeds, all failed scmds on
+ all ready or offline sdevs on the host are EH-finished.
+
+ 5. If !list_empty(&eh_work_q), invoke scsi_eh_offline_sdevs()
+
+ <<scsi_eh_offline_sdevs>>
+
+ Take all sdevs which still have unrecovered scmds offline
+ and EH-finish the scmds.
+
+ 5. Invoke scsi_eh_flush_done_q().
+
+ <<scsi_eh_flush_done_q>>
+
+ At this point all scmds are recovered (or given up) and
+ put on eh_done_q by scsi_eh_finish_cmd(). This function
+ flushes eh_done_q by either retrying or notifying upper
+ layer of failure of the scmds.
+
+
+[2-2] EH through hostt->eh_strategy_handler()
+
+ hostt->eh_strategy_handler() is invoked in the place of
+scsi_unjam_host() and it is responsible for whole recovery process.
+On completion, the handler should have made lower layers forget about
+all failed scmds and either ready for new commands or offline. Also,
+it should perform SCSI EH maintenance choirs to maintain integrity of
+SCSI midlayer. IOW, of the steps described in [2-1-2], all steps
+except for #1 must be implemented by eh_strategy_handler().
+
+
+[2-2-1] Pre hostt->eh_strategy_handler() SCSI midlayer conditions
+
+ The following conditions are true on entry to the handler.
+
+ - Each failed scmd's eh_flags field is set appropriately.
+
+ - Each failed scmd is linked on scmd->eh_cmd_q by scmd->eh_entry.
+
+ - SHOST_RECOVERY is set.
+
+ - shost->host_failed == shost->host_busy
+
+
+[2-2-2] Post hostt->eh_strategy_handler() SCSI midlayer conditions
+
+ The following conditions must be true on exit from the handler.
+
+ - shost->host_failed is zero.
+
+ - Each scmd's eh_eflags field is cleared.
+
+ - Each scmd is in such a state that scsi_setup_cmd_retry() on the
+ scmd doesn't make any difference.
+
+ - shost->eh_cmd_q is cleared.
+
+ - Each scmd->eh_entry is cleared.
+
+ - Either scsi_queue_insert() or scsi_finish_command() is called on
+ each scmd. Note that the handler is free to use scmd->retries and
+ ->allowed to limit the number of retries.
+
+
+[2-2-3] Things to consider
+
+ - Know that timed out scmds are still active on lower layers. Make
+ lower layers forget about them before doing anything else with
+ those scmds.
+
+ - For consistency, when accessing/modifying shost data structure,
+ grab shost->host_lock.
+
+ - On completion, each failed sdev must have forgotten about all
+ active scmds.
+
+ - On completion, each failed sdev must be ready for new commands or
+ offline.
+
+
+--
+Tejun Heo
+htejun@gmail.com
+11th September 2005
safe_for_read(READ_12),
safe_for_read(READ_16),
safe_for_read(READ_BUFFER),
+ safe_for_read(READ_DEFECT_DATA),
safe_for_read(READ_LONG),
safe_for_read(INQUIRY),
safe_for_read(MODE_SENSE),
static int sbp2_start_device(struct scsi_id_instance_data *scsi_id)
{
struct sbp2scsi_host_info *hi = scsi_id->hi;
- struct scsi_device *sdev;
+ int error;
SBP2_DEBUG("sbp2_start_device");
sbp2_max_speed_and_size(scsi_id);
/* Add this device to the scsi layer now */
- sdev = scsi_add_device(scsi_id->scsi_host, 0, scsi_id->ud->id, 0);
- if (IS_ERR(sdev)) {
+ error = scsi_add_device(scsi_id->scsi_host, 0, scsi_id->ud->id, 0);
+ if (error) {
SBP2_ERR("scsi_add_device failed");
- return PTR_ERR(sdev);
+ return error;
}
return 0;
Fix 'handled=1' ISR usage, remove bogus IRQ check.
Remove un-needed eh_abort handler.
Add support for embedded firmware error strings.
+ 2.26.02.003 - Correctly handle single sgl's with use_sg=1.
*/
#include <linux/module.h>
#include "3w-9xxx.h"
/* Globals */
-#define TW_DRIVER_VERSION "2.26.02.002"
+#define TW_DRIVER_VERSION "2.26.02.003"
static TW_Device_Extension *twa_device_extension_list[TW_MAX_SLOT];
static unsigned int twa_device_extension_count;
static int twa_major = -1;
if (tw_dev->srb[request_id]->request_bufflen < TW_MIN_SGL_LENGTH) {
command_packet->sg_list[0].address = tw_dev->generic_buffer_phys[request_id];
command_packet->sg_list[0].length = TW_MIN_SGL_LENGTH;
+ if (tw_dev->srb[request_id]->sc_data_direction == DMA_TO_DEVICE || tw_dev->srb[request_id]->sc_data_direction == DMA_BIDIRECTIONAL)
+ memcpy(tw_dev->generic_buffer_virt[request_id], tw_dev->srb[request_id]->request_buffer, tw_dev->srb[request_id]->request_bufflen);
} else {
buffaddr = twa_map_scsi_single_data(tw_dev, request_id);
if (buffaddr == 0)
if (tw_dev->srb[request_id]->use_sg > 0) {
if ((tw_dev->srb[request_id]->use_sg == 1) && (tw_dev->srb[request_id]->request_bufflen < TW_MIN_SGL_LENGTH)) {
+ if (tw_dev->srb[request_id]->sc_data_direction == DMA_TO_DEVICE || tw_dev->srb[request_id]->sc_data_direction == DMA_BIDIRECTIONAL) {
+ struct scatterlist *sg = (struct scatterlist *)tw_dev->srb[request_id]->request_buffer;
+ char *buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
+ memcpy(tw_dev->generic_buffer_virt[request_id], buf, sg->length);
+ kunmap_atomic(buf - sg->offset, KM_IRQ0);
+ }
command_packet->sg_list[0].address = tw_dev->generic_buffer_phys[request_id];
command_packet->sg_list[0].length = TW_MIN_SGL_LENGTH;
} else {
/* This function completes an execute scsi operation */
static void twa_scsiop_execute_scsi_complete(TW_Device_Extension *tw_dev, int request_id)
{
- /* Copy the response if too small */
- if ((tw_dev->srb[request_id]->request_buffer) && (tw_dev->srb[request_id]->request_bufflen < TW_MIN_SGL_LENGTH)) {
- memcpy(tw_dev->srb[request_id]->request_buffer,
- tw_dev->generic_buffer_virt[request_id],
- tw_dev->srb[request_id]->request_bufflen);
+ if (tw_dev->srb[request_id]->request_bufflen < TW_MIN_SGL_LENGTH &&
+ (tw_dev->srb[request_id]->sc_data_direction == DMA_FROM_DEVICE ||
+ tw_dev->srb[request_id]->sc_data_direction == DMA_BIDIRECTIONAL)) {
+ if (tw_dev->srb[request_id]->use_sg == 0) {
+ memcpy(tw_dev->srb[request_id]->request_buffer,
+ tw_dev->generic_buffer_virt[request_id],
+ tw_dev->srb[request_id]->request_bufflen);
+ }
+ if (tw_dev->srb[request_id]->use_sg == 1) {
+ struct scatterlist *sg = (struct scatterlist *)tw_dev->srb[request_id]->request_buffer;
+ char *buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
+ memcpy(buf, tw_dev->generic_buffer_virt[request_id], sg->length);
+ kunmap_atomic(buf - sg->offset, KM_IRQ0);
+ }
}
} /* End twa_scsiop_execute_scsi_complete() */
each attached iSCSI device to sysfs, say Y.
Otherwise, say N.
+config SCSI_SAS_ATTRS
+ tristate "SAS Transport Attributes"
+ depends on SCSI
+ help
+ If you wish to export transport-specific information about
+ each attached SAS device to sysfs, say Y.
+
endmenu
menu "SCSI low-level drivers"
obj-$(CONFIG_SCSI_SPI_ATTRS) += scsi_transport_spi.o
obj-$(CONFIG_SCSI_FC_ATTRS) += scsi_transport_fc.o
obj-$(CONFIG_SCSI_ISCSI_ATTRS) += scsi_transport_iscsi.o
+obj-$(CONFIG_SCSI_SAS_ATTRS) += scsi_transport_sas.o
obj-$(CONFIG_SCSI_AMIGA7XX) += amiga7xx.o 53c7xx.o
obj-$(CONFIG_A3000_SCSI) += a3000.o wd33c93.o
lpfc_get_host_fabric_name (struct Scsi_Host *shost)
{
struct lpfc_hba *phba = (struct lpfc_hba*)shost->hostdata[0];
- u64 nodename;
+ u64 node_name;
spin_lock_irq(shost->host_lock);
if ((phba->fc_flag & FC_FABRIC) ||
((phba->fc_topology == TOPOLOGY_LOOP) &&
(phba->fc_flag & FC_PUBLIC_LOOP)))
- memcpy(&nodename, &phba->fc_fabparam.nodeName, sizeof(u64));
+ node_name = wwn_to_u64(phba->fc_fabparam.nodeName.wwn);
else
/* fabric is local port if there is no F/FL_Port */
- memcpy(&nodename, &phba->fc_nodename, sizeof(u64));
+ node_name = wwn_to_u64(phba->fc_nodename.wwn);
spin_unlock_irq(shost->host_lock);
- fc_host_fabric_name(shost) = be64_to_cpu(nodename);
+ fc_host_fabric_name(shost) = node_name;
}
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct lpfc_hba *phba = (struct lpfc_hba *) shost->hostdata[0];
- uint64_t node_name = 0;
+ u64 node_name = 0;
struct lpfc_nodelist *ndlp = NULL;
spin_lock_irq(shost->host_lock);
/* Search the mapped list for this target ID */
list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
if (starget->id == ndlp->nlp_sid) {
- memcpy(&node_name, &ndlp->nlp_nodename,
- sizeof(struct lpfc_name));
+ node_name = wwn_to_u64(ndlp->nlp_nodename.wwn);
break;
}
}
spin_unlock_irq(shost->host_lock);
- fc_starget_node_name(starget) = be64_to_cpu(node_name);
+ fc_starget_node_name(starget) = node_name;
}
static void
{
struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
struct lpfc_hba *phba = (struct lpfc_hba *) shost->hostdata[0];
- uint64_t port_name = 0;
+ u64 port_name = 0;
struct lpfc_nodelist *ndlp = NULL;
spin_lock_irq(shost->host_lock);
/* Search the mapped list for this target ID */
list_for_each_entry(ndlp, &phba->fc_nlpmap_list, nlp_listp) {
if (starget->id == ndlp->nlp_sid) {
- memcpy(&port_name, &ndlp->nlp_portname,
- sizeof(struct lpfc_name));
+ port_name = wwn_to_u64(ndlp->nlp_portname.wwn);
break;
}
}
spin_unlock_irq(shost->host_lock);
- fc_starget_port_name(starget) = be64_to_cpu(port_name);
+ fc_starget_port_name(starget) = port_name;
}
static void
struct fc_rport *rport;
struct lpfc_rport_data *rdata;
struct fc_rport_identifiers rport_ids;
- uint64_t wwn;
/* Remote port has reappeared. Re-register w/ FC transport */
- memcpy(&wwn, &ndlp->nlp_nodename, sizeof(uint64_t));
- rport_ids.node_name = be64_to_cpu(wwn);
- memcpy(&wwn, &ndlp->nlp_portname, sizeof(uint64_t));
- rport_ids.port_name = be64_to_cpu(wwn);
+ rport_ids.node_name = wwn_to_u64(ndlp->nlp_nodename.wwn);
+ rport_ids.port_name = wwn_to_u64(ndlp->nlp_portname.wwn);
rport_ids.port_id = ndlp->nlp_DID;
rport_ids.roles = FC_RPORT_ROLE_UNKNOWN;
if (ndlp->nlp_type & NLP_FCP_TARGET)
#define FF_FRAME_SIZE 2048
struct lpfc_name {
+ union {
+ struct {
#ifdef __BIG_ENDIAN_BITFIELD
- uint8_t nameType:4; /* FC Word 0, bit 28:31 */
- uint8_t IEEEextMsn:4; /* FC Word 0, bit 24:27, bit 8:11 of IEEE ext */
+ uint8_t nameType:4; /* FC Word 0, bit 28:31 */
+ uint8_t IEEEextMsn:4; /* FC Word 0, bit 24:27, bit 8:11 of IEEE ext */
#else /* __LITTLE_ENDIAN_BITFIELD */
- uint8_t IEEEextMsn:4; /* FC Word 0, bit 24:27, bit 8:11 of IEEE ext */
- uint8_t nameType:4; /* FC Word 0, bit 28:31 */
+ uint8_t IEEEextMsn:4; /* FC Word 0, bit 24:27, bit 8:11 of IEEE ext */
+ uint8_t nameType:4; /* FC Word 0, bit 28:31 */
#endif
#define NAME_IEEE 0x1 /* IEEE name - nameType */
#define NAME_IP_TYPE 0x4 /* IP address */
#define NAME_CCITT_TYPE 0xC
#define NAME_CCITT_GR_TYPE 0xE
- uint8_t IEEEextLsb; /* FC Word 0, bit 16:23, IEEE extended Lsb */
- uint8_t IEEE[6]; /* FC IEEE address */
+ uint8_t IEEEextLsb; /* FC Word 0, bit 16:23, IEEE extended Lsb */
+ uint8_t IEEE[6]; /* FC IEEE address */
+ };
+ uint8_t wwn[8];
+ };
};
struct csp {
unsigned long bar0map_len, bar2map_len;
int error = -ENODEV, retval;
int i;
- u64 wwname;
if (pci_enable_device(pdev))
goto out;
* Must done after lpfc_sli_hba_setup()
*/
- memcpy(&wwname, &phba->fc_nodename, sizeof(u64));
- fc_host_node_name(host) = be64_to_cpu(wwname);
- memcpy(&wwname, &phba->fc_portname, sizeof(u64));
- fc_host_port_name(host) = be64_to_cpu(wwname);
+ fc_host_node_name(host) = wwn_to_u64(phba->fc_nodename.wwn);
+ fc_host_port_name(host) = wwn_to_u64(phba->fc_portname.wwn);
fc_host_supported_classes(host) = FC_COS_CLASS3;
memset(fc_host_supported_fc4s(host), 0,
struct Scsi_Host *host = dev_to_shost(starget->dev.parent);
scsi_qla_host_t *ha = to_qla_host(host);
fc_port_t *fcport;
- uint64_t node_name = 0;
+ u64 node_name = 0;
list_for_each_entry(fcport, &ha->fcports, list) {
if (starget->id == fcport->os_target_id) {
- node_name = *(uint64_t *)fcport->node_name;
+ node_name = wwn_to_u64(fcport->node_name);
break;
}
}
- fc_starget_node_name(starget) = be64_to_cpu(node_name);
+ fc_starget_node_name(starget) = node_name;
}
static void
struct Scsi_Host *host = dev_to_shost(starget->dev.parent);
scsi_qla_host_t *ha = to_qla_host(host);
fc_port_t *fcport;
- uint64_t port_name = 0;
+ u64 port_name = 0;
list_for_each_entry(fcport, &ha->fcports, list) {
if (starget->id == fcport->os_target_id) {
- port_name = *(uint64_t *)fcport->port_name;
+ port_name = wwn_to_u64(fcport->port_name);
break;
}
}
- fc_starget_port_name(starget) = be64_to_cpu(port_name);
+ fc_starget_port_name(starget) = port_name;
}
static void
void
qla2x00_init_host_attr(scsi_qla_host_t *ha)
{
- fc_host_node_name(ha->host) =
- be64_to_cpu(*(uint64_t *)ha->init_cb->node_name);
- fc_host_port_name(ha->host) =
- be64_to_cpu(*(uint64_t *)ha->init_cb->port_name);
+ fc_host_node_name(ha->host) = wwn_to_u64(ha->init_cb->node_name);
+ fc_host_port_name(ha->host) = wwn_to_u64(ha->init_cb->port_name);
fc_host_supported_classes(ha->host) = FC_COS_CLASS3;
}
return;
}
- rport_ids.node_name = be64_to_cpu(*(uint64_t *)fcport->node_name);
- rport_ids.port_name = be64_to_cpu(*(uint64_t *)fcport->port_name);
+ rport_ids.node_name = wwn_to_u64(fcport->node_name);
+ rport_ids.port_name = wwn_to_u64(fcport->port_name);
rport_ids.port_id = fcport->d_id.b.domain << 16 |
fcport->d_id.b.area << 8 | fcport->d_id.b.al_pa;
rport_ids.roles = FC_RPORT_ROLE_UNKNOWN;
}
static void scsi_run_queue(struct request_queue *q);
+static void scsi_release_buffers(struct scsi_cmnd *cmd);
+
+/*
+ * Function: scsi_unprep_request()
+ *
+ * Purpose: Remove all preparation done for a request, including its
+ * associated scsi_cmnd, so that it can be requeued.
+ *
+ * Arguments: req - request to unprepare
+ *
+ * Lock status: Assumed that no locks are held upon entry.
+ *
+ * Returns: Nothing.
+ */
+static void scsi_unprep_request(struct request *req)
+{
+ struct scsi_cmnd *cmd = req->special;
+
+ req->flags &= ~REQ_DONTPREP;
+ req->special = (req->flags & REQ_SPECIAL) ? cmd->sc_request : NULL;
+
+ scsi_release_buffers(cmd);
+ scsi_put_command(cmd);
+}
/*
* Function: scsi_queue_insert()
* commands.
* Notes: This could be called either from an interrupt context or a
* normal process context.
+ * Notes: Upon return, cmd is a stale pointer.
*/
int scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
{
struct Scsi_Host *host = cmd->device->host;
struct scsi_device *device = cmd->device;
struct request_queue *q = device->request_queue;
+ struct request *req = cmd->request;
unsigned long flags;
SCSI_LOG_MLQUEUE(1,
* function. The SCSI request function detects the blocked condition
* and plugs the queue appropriately.
*/
+ scsi_unprep_request(req);
spin_lock_irqsave(q->queue_lock, flags);
- blk_requeue_request(q, cmd->request);
+ blk_requeue_request(q, req);
spin_unlock_irqrestore(q->queue_lock, flags);
scsi_run_queue(q);
int result;
if (sshdr) {
- sense = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
+ sense = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
if (!sense)
return DRIVER_ERROR << 24;
memset(sense, 0, SCSI_SENSE_BUFFERSIZE);
* I/O errors in the middle of the request, in which case
* we need to request the blocks that come after the bad
* sector.
+ * Notes: Upon return, cmd is a stale pointer.
*/
static void scsi_requeue_command(struct request_queue *q, struct scsi_cmnd *cmd)
{
+ struct request *req = cmd->request;
unsigned long flags;
- cmd->request->flags &= ~REQ_DONTPREP;
-
+ scsi_unprep_request(req);
spin_lock_irqsave(q->queue_lock, flags);
- blk_requeue_request(q, cmd->request);
+ blk_requeue_request(q, req);
spin_unlock_irqrestore(q->queue_lock, flags);
scsi_run_queue(q);
*
* Lock status: Assumed that lock is not held upon entry.
*
- * Returns: cmd if requeue done or required, NULL otherwise
+ * Returns: cmd if requeue required, NULL otherwise.
*
* Notes: This is called for block device requests in order to
* mark some number of sectors as complete.
*
* We are guaranteeing that the request queue will be goosed
* at some point during this call.
+ * Notes: If cmd was requeued, upon return it will be a stale pointer.
*/
static struct scsi_cmnd *scsi_end_request(struct scsi_cmnd *cmd, int uptodate,
int bytes, int requeue)
if (!uptodate && blk_noretry_request(req))
end_that_request_chunk(req, 0, leftover);
else {
- if (requeue)
+ if (requeue) {
/*
* Bleah. Leftovers again. Stick the
* leftovers in the front of the
* queue, and goose the queue again.
*/
scsi_requeue_command(q, cmd);
-
+ cmd = NULL;
+ }
return cmd;
}
}
* requeueing right here - we will requeue down below
* when we handle the bad sectors.
*/
- cmd = scsi_end_request(cmd, 1, good_bytes, result == 0);
/*
- * If the command completed without error, then either finish off the
- * rest of the command, or start a new one.
+ * If the command completed without error, then either
+ * finish off the rest of the command, or start a new one.
*/
- if (result == 0 || cmd == NULL ) {
+ if (scsi_end_request(cmd, 1, good_bytes, result == 0) == NULL)
return;
- }
}
/*
* Now, if we were good little boys and girls, Santa left us a request
* and quietly refuse further access.
*/
cmd->device->changed = 1;
- cmd = scsi_end_request(cmd, 0,
+ scsi_end_request(cmd, 0,
this_count, 1);
return;
} else {
scsi_requeue_command(q, cmd);
result = 0;
} else {
- cmd = scsi_end_request(cmd, 0, this_count, 1);
+ scsi_end_request(cmd, 0, this_count, 1);
return;
}
break;
dev_printk(KERN_INFO,
&cmd->device->sdev_gendev,
"Device not ready.\n");
- cmd = scsi_end_request(cmd, 0, this_count, 1);
+ scsi_end_request(cmd, 0, this_count, 1);
return;
case VOLUME_OVERFLOW:
if (!(req->flags & REQ_QUIET)) {
__scsi_print_command(cmd->data_cmnd);
scsi_print_sense("", cmd);
}
- cmd = scsi_end_request(cmd, 0, block_bytes, 1);
+ scsi_end_request(cmd, 0, block_bytes, 1);
return;
default:
break;
block_bytes = req->hard_cur_sectors << 9;
if (!block_bytes)
block_bytes = req->data_len;
- cmd = scsi_end_request(cmd, 0, block_bytes, 1);
+ scsi_end_request(cmd, 0, block_bytes, 1);
}
}
EXPORT_SYMBOL(scsi_io_completion);
if (unlikely(!scsi_device_online(sdev))) {
printk(KERN_ERR "scsi%d (%d:%d): rejecting I/O to offline device\n",
sdev->host->host_no, sdev->id, sdev->lun);
- return BLKPREP_KILL;
+ goto kill;
}
if (unlikely(sdev->sdev_state != SDEV_RUNNING)) {
/* OK, we're not in a running state don't prep
* at all allowed down */
printk(KERN_ERR "scsi%d (%d:%d): rejecting I/O to dead device\n",
sdev->host->host_no, sdev->id, sdev->lun);
- return BLKPREP_KILL;
+ goto kill;
}
/* OK, we only allow special commands (i.e. not
* user initiated ones */
if(unlikely(specials_only) && !(req->flags & REQ_SPECIAL)) {
if(specials_only == SDEV_QUIESCE ||
specials_only == SDEV_BLOCK)
- return BLKPREP_DEFER;
+ goto defer;
printk(KERN_ERR "scsi%d (%d:%d): rejecting I/O to device being removed\n",
sdev->host->host_no, sdev->id, sdev->lun);
- return BLKPREP_KILL;
+ goto kill;
}
cmd->tag = req->tag;
} else {
blk_dump_rq_flags(req, "SCSI bad req");
- return BLKPREP_KILL;
+ goto kill;
}
/* note the overloading of req->special. When the tag
* required).
*/
ret = scsi_init_io(cmd);
- if (ret) /* BLKPREP_KILL return also releases the command */
- return ret;
+ switch(ret) {
+ case BLKPREP_KILL:
+ /* BLKPREP_KILL return also releases the command */
+ goto kill;
+ case BLKPREP_DEFER:
+ goto defer;
+ }
/*
* Initialize the actual SCSI command for this request.
if (unlikely(!drv->init_command(cmd))) {
scsi_release_buffers(cmd);
scsi_put_command(cmd);
- return BLKPREP_KILL;
+ goto kill;
}
} else {
memcpy(cmd->cmnd, req->cmd, sizeof(cmd->cmnd));
if (sdev->device_busy == 0)
blk_plug_device(q);
return BLKPREP_DEFER;
+ kill:
+ req->errors = DID_NO_CONNECT << 16;
+ return BLKPREP_KILL;
}
/*
}
/*
- * Kill requests for a dead device
+ * Kill a request for a dead device
*/
-static void scsi_kill_requests(request_queue_t *q)
+static void scsi_kill_request(struct request *req, request_queue_t *q)
{
- struct request *req;
+ struct scsi_cmnd *cmd = req->special;
+
+ blkdev_dequeue_request(req);
- while ((req = elv_next_request(q)) != NULL) {
- blkdev_dequeue_request(req);
- req->flags |= REQ_QUIET;
- while (end_that_request_first(req, 0, req->nr_sectors))
- ;
- end_that_request_last(req);
+ if (unlikely(cmd == NULL)) {
+ printk(KERN_CRIT "impossible request in %s.\n",
+ __FUNCTION__);
+ BUG();
}
+
+ scsi_init_cmd_errh(cmd);
+ cmd->result = DID_NO_CONNECT << 16;
+ atomic_inc(&cmd->device->iorequest_cnt);
+ __scsi_done(cmd);
}
/*
if (!sdev) {
printk("scsi: killing requests for dead queue\n");
- scsi_kill_requests(q);
+ while ((req = elv_next_request(q)) != NULL)
+ scsi_kill_request(req, q);
return;
}
if (unlikely(!scsi_device_online(sdev))) {
printk(KERN_ERR "scsi%d (%d:%d): rejecting I/O to offline device\n",
sdev->host->host_no, sdev->id, sdev->lun);
- blkdev_dequeue_request(req);
- req->flags |= REQ_QUIET;
- while (end_that_request_first(req, 0, req->nr_sectors))
- ;
- end_that_request_last(req);
+ scsi_kill_request(req, q);
continue;
}
sdev->device_busy++;
spin_unlock(q->queue_lock);
+ cmd = req->special;
+ if (unlikely(cmd == NULL)) {
+ printk(KERN_CRIT "impossible request in %s.\n"
+ "please mail a stack trace to "
+ "linux-scsi@vger.kernel.org",
+ __FUNCTION__);
+ BUG();
+ }
spin_lock(shost->host_lock);
if (!scsi_host_queue_ready(q, shost, sdev))
*/
spin_unlock_irq(shost->host_lock);
- cmd = req->special;
- if (unlikely(cmd == NULL)) {
- printk(KERN_CRIT "impossible request in %s.\n"
- "please mail a stack trace to "
- "linux-scsi@vger.kernel.org",
- __FUNCTION__);
- BUG();
- }
-
/*
* Finally, initialize any error handling parameters, and set up
* the timers for timeouts.
* cases (host limits or settings) should run the queue at some
* later time.
*/
+ scsi_unprep_request(req);
spin_lock_irq(q->queue_lock);
blk_requeue_request(q, req);
sdev->device_busy--;
extern void scsi_sysfs_device_initialize(struct scsi_device *);
extern int scsi_sysfs_target_initialize(struct scsi_device *);
extern struct scsi_transport_template blank_transport_template;
+extern void __scsi_remove_device(struct scsi_device *);
extern struct bus_type scsi_bus_type;
out_free_sdev:
if (res == SCSI_SCAN_LUN_PRESENT) {
if (sdevp) {
- scsi_device_get(sdev);
- *sdevp = sdev;
+ if (scsi_device_get(sdev) == 0) {
+ *sdevp = sdev;
+ } else {
+ __scsi_remove_device(sdev);
+ res = SCSI_SCAN_NO_RESPONSE;
+ }
}
} else {
if (sdev->host->hostt->slave_destroy)
}
EXPORT_SYMBOL(__scsi_add_device);
+int scsi_add_device(struct Scsi_Host *host, uint channel,
+ uint target, uint lun)
+{
+ struct scsi_device *sdev =
+ __scsi_add_device(host, channel, target, lun, NULL);
+ if (IS_ERR(sdev))
+ return PTR_ERR(sdev);
+
+ scsi_device_put(sdev);
+ return 0;
+}
+EXPORT_SYMBOL(scsi_add_device);
+
void scsi_rescan_device(struct device *dev)
{
struct scsi_driver *drv;
}
EXPORT_SYMBOL(scsi_rescan_device);
-/**
- * scsi_scan_target - scan a target id, possibly including all LUNs on the
- * target.
- * @sdevsca: Scsi_Device handle for scanning
- * @shost: host to scan
- * @channel: channel to scan
- * @id: target id to scan
- *
- * Description:
- * Scan the target id on @shost, @channel, and @id. Scan at least LUN
- * 0, and possibly all LUNs on the target id.
- *
- * Use the pre-allocated @sdevscan as a handle for the scanning. This
- * function sets sdevscan->host, sdevscan->id and sdevscan->lun; the
- * scanning functions modify sdevscan->lun.
- *
- * First try a REPORT LUN scan, if that does not scan the target, do a
- * sequential scan of LUNs on the target id.
- **/
-void scsi_scan_target(struct device *parent, unsigned int channel,
- unsigned int id, unsigned int lun, int rescan)
+static void __scsi_scan_target(struct device *parent, unsigned int channel,
+ unsigned int id, unsigned int lun, int rescan)
{
struct Scsi_Host *shost = dev_to_shost(parent);
int bflags = 0;
*/
return;
-
starget = scsi_alloc_target(parent, channel, id);
-
if (!starget)
return;
put_device(&starget->dev);
}
+
+/**
+ * scsi_scan_target - scan a target id, possibly including all LUNs on the
+ * target.
+ * @parent: host to scan
+ * @channel: channel to scan
+ * @id: target id to scan
+ * @lun: Specific LUN to scan or SCAN_WILD_CARD
+ * @rescan: passed to LUN scanning routines
+ *
+ * Description:
+ * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
+ * and possibly all LUNs on the target id.
+ *
+ * First try a REPORT LUN scan, if that does not scan the target, do a
+ * sequential scan of LUNs on the target id.
+ **/
+void scsi_scan_target(struct device *parent, unsigned int channel,
+ unsigned int id, unsigned int lun, int rescan)
+{
+ struct Scsi_Host *shost = dev_to_shost(parent);
+
+ down(&shost->scan_mutex);
+ if (scsi_host_scan_allowed(shost))
+ __scsi_scan_target(parent, channel, id, lun, rescan);
+ up(&shost->scan_mutex);
+}
EXPORT_SYMBOL(scsi_scan_target);
static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
order_id = shost->max_id - id - 1;
else
order_id = id;
- scsi_scan_target(&shost->shost_gendev, channel, order_id, lun, rescan);
+ __scsi_scan_target(&shost->shost_gendev, channel,
+ order_id, lun, rescan);
}
else
- scsi_scan_target(&shost->shost_gendev, channel, id, lun, rescan);
+ __scsi_scan_target(&shost->shost_gendev, channel,
+ id, lun, rescan);
}
int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
*/
struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
{
- struct scsi_device *sdev;
+ struct scsi_device *sdev = NULL;
struct scsi_target *starget;
+ down(&shost->scan_mutex);
+ if (!scsi_host_scan_allowed(shost))
+ goto out;
starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
if (!starget)
- return NULL;
+ goto out;
sdev = scsi_alloc_sdev(starget, 0, NULL);
if (sdev) {
sdev->borken = 0;
}
put_device(&starget->dev);
+ out:
+ up(&shost->scan_mutex);
return sdev;
}
EXPORT_SYMBOL(scsi_get_host_dev);
error = attr_add(&sdev->sdev_gendev,
sdev->host->hostt->sdev_attrs[i]);
if (error) {
- scsi_remove_device(sdev);
+ __scsi_remove_device(sdev);
goto out;
}
}
scsi_sysfs_sdev_attrs[i]);
error = device_create_file(&sdev->sdev_gendev, attr);
if (error) {
- scsi_remove_device(sdev);
+ __scsi_remove_device(sdev);
goto out;
}
}
return error;
}
-/**
- * scsi_remove_device - unregister a device from the scsi bus
- * @sdev: scsi_device to unregister
- **/
-void scsi_remove_device(struct scsi_device *sdev)
+void __scsi_remove_device(struct scsi_device *sdev)
{
- struct Scsi_Host *shost = sdev->host;
-
- down(&shost->scan_mutex);
if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
- goto out;
+ return;
class_device_unregister(&sdev->sdev_classdev);
device_del(&sdev->sdev_gendev);
sdev->host->hostt->slave_destroy(sdev);
transport_unregister_device(&sdev->sdev_gendev);
put_device(&sdev->sdev_gendev);
-out:
- up(&shost->scan_mutex);
+}
+
+/**
+ * scsi_remove_device - unregister a device from the scsi bus
+ * @sdev: scsi_device to unregister
+ **/
+void scsi_remove_device(struct scsi_device *sdev)
+{
+ down(&sdev->host->scan_mutex);
+ __scsi_remove_device(sdev);
+ up(&sdev->host->scan_mutex);
}
EXPORT_SYMBOL(scsi_remove_device);
--- /dev/null
+/*
+ * Copyright (C) 2005 Dell Inc.
+ * Released under GPL v2.
+ *
+ * Serial Attached SCSI (SAS) transport class.
+ *
+ * The SAS transport class contains common code to deal with SAS HBAs,
+ * an aproximated representation of SAS topologies in the driver model,
+ * and various sysfs attributes to expose these topologies and managment
+ * interfaces to userspace.
+ *
+ * In addition to the basic SCSI core objects this transport class
+ * introduces two additional intermediate objects: The SAS PHY
+ * as represented by struct sas_phy defines an "outgoing" PHY on
+ * a SAS HBA or Expander, and the SAS remote PHY represented by
+ * struct sas_rphy defines an "incoming" PHY on a SAS Expander or
+ * end device. Note that this is purely a software concept, the
+ * underlying hardware for a PHY and a remote PHY is the exactly
+ * the same.
+ *
+ * There is no concept of a SAS port in this code, users can see
+ * what PHYs form a wide port based on the port_identifier attribute,
+ * which is the same for all PHYs in a port.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/err.h>
+
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_sas.h>
+
+
+#define SAS_HOST_ATTRS 0
+#define SAS_PORT_ATTRS 11
+#define SAS_RPORT_ATTRS 5
+
+struct sas_internal {
+ struct scsi_transport_template t;
+ struct sas_function_template *f;
+
+ struct class_device_attribute private_host_attrs[SAS_HOST_ATTRS];
+ struct class_device_attribute private_phy_attrs[SAS_PORT_ATTRS];
+ struct class_device_attribute private_rphy_attrs[SAS_RPORT_ATTRS];
+
+ struct transport_container phy_attr_cont;
+ struct transport_container rphy_attr_cont;
+
+ /*
+ * The array of null terminated pointers to attributes
+ * needed by scsi_sysfs.c
+ */
+ struct class_device_attribute *host_attrs[SAS_HOST_ATTRS + 1];
+ struct class_device_attribute *phy_attrs[SAS_PORT_ATTRS + 1];
+ struct class_device_attribute *rphy_attrs[SAS_RPORT_ATTRS + 1];
+};
+#define to_sas_internal(tmpl) container_of(tmpl, struct sas_internal, t)
+
+struct sas_host_attrs {
+ struct list_head rphy_list;
+ spinlock_t lock;
+ u32 next_target_id;
+};
+#define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
+
+
+/*
+ * Hack to allow attributes of the same name in different objects.
+ */
+#define SAS_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
+ struct class_device_attribute class_device_attr_##_prefix##_##_name = \
+ __ATTR(_name,_mode,_show,_store)
+
+
+/*
+ * Pretty printing helpers
+ */
+
+#define sas_bitfield_name_match(title, table) \
+static ssize_t \
+get_sas_##title##_names(u32 table_key, char *buf) \
+{ \
+ char *prefix = ""; \
+ ssize_t len = 0; \
+ int i; \
+ \
+ for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) { \
+ if (table[i].value & table_key) { \
+ len += sprintf(buf + len, "%s%s", \
+ prefix, table[i].name); \
+ prefix = ", "; \
+ } \
+ } \
+ len += sprintf(buf + len, "\n"); \
+ return len; \
+}
+
+#define sas_bitfield_name_search(title, table) \
+static ssize_t \
+get_sas_##title##_names(u32 table_key, char *buf) \
+{ \
+ ssize_t len = 0; \
+ int i; \
+ \
+ for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) { \
+ if (table[i].value == table_key) { \
+ len += sprintf(buf + len, "%s", \
+ table[i].name); \
+ break; \
+ } \
+ } \
+ len += sprintf(buf + len, "\n"); \
+ return len; \
+}
+
+static struct {
+ u32 value;
+ char *name;
+} sas_device_type_names[] = {
+ { SAS_PHY_UNUSED, "unused" },
+ { SAS_END_DEVICE, "end device" },
+ { SAS_EDGE_EXPANDER_DEVICE, "edge expander" },
+ { SAS_FANOUT_EXPANDER_DEVICE, "fanout expander" },
+};
+sas_bitfield_name_search(device_type, sas_device_type_names)
+
+
+static struct {
+ u32 value;
+ char *name;
+} sas_protocol_names[] = {
+ { SAS_PROTOCOL_SATA, "sata" },
+ { SAS_PROTOCOL_SMP, "smp" },
+ { SAS_PROTOCOL_STP, "stp" },
+ { SAS_PROTOCOL_SSP, "ssp" },
+};
+sas_bitfield_name_match(protocol, sas_protocol_names)
+
+static struct {
+ u32 value;
+ char *name;
+} sas_linkspeed_names[] = {
+ { SAS_LINK_RATE_UNKNOWN, "Unknown" },
+ { SAS_PHY_DISABLED, "Phy disabled" },
+ { SAS_LINK_RATE_FAILED, "Link Rate failed" },
+ { SAS_SATA_SPINUP_HOLD, "Spin-up hold" },
+ { SAS_LINK_RATE_1_5_GBPS, "1.5 Gbit" },
+ { SAS_LINK_RATE_3_0_GBPS, "3.0 Gbit" },
+};
+sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
+
+
+/*
+ * SAS host attributes
+ */
+
+static int sas_host_setup(struct transport_container *tc, struct device *dev,
+ struct class_device *cdev)
+{
+ struct Scsi_Host *shost = dev_to_shost(dev);
+ struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+
+ INIT_LIST_HEAD(&sas_host->rphy_list);
+ spin_lock_init(&sas_host->lock);
+ sas_host->next_target_id = 0;
+ return 0;
+}
+
+static DECLARE_TRANSPORT_CLASS(sas_host_class,
+ "sas_host", sas_host_setup, NULL, NULL);
+
+static int sas_host_match(struct attribute_container *cont,
+ struct device *dev)
+{
+ struct Scsi_Host *shost;
+ struct sas_internal *i;
+
+ if (!scsi_is_host_device(dev))
+ return 0;
+ shost = dev_to_shost(dev);
+
+ if (!shost->transportt)
+ return 0;
+ if (shost->transportt->host_attrs.ac.class !=
+ &sas_host_class.class)
+ return 0;
+
+ i = to_sas_internal(shost->transportt);
+ return &i->t.host_attrs.ac == cont;
+}
+
+static int do_sas_phy_delete(struct device *dev, void *data)
+{
+ if (scsi_is_sas_phy(dev))
+ sas_phy_delete(dev_to_phy(dev));
+ return 0;
+}
+
+/**
+ * sas_remove_host -- tear down a Scsi_Host's SAS data structures
+ * @shost: Scsi Host that is torn down
+ *
+ * Removes all SAS PHYs and remote PHYs for a given Scsi_Host.
+ * Must be called just before scsi_remove_host for SAS HBAs.
+ */
+void sas_remove_host(struct Scsi_Host *shost)
+{
+ device_for_each_child(&shost->shost_gendev, NULL, do_sas_phy_delete);
+}
+EXPORT_SYMBOL(sas_remove_host);
+
+
+/*
+ * SAS Port attributes
+ */
+
+#define sas_phy_show_simple(field, name, format_string, cast) \
+static ssize_t \
+show_sas_phy_##name(struct class_device *cdev, char *buf) \
+{ \
+ struct sas_phy *phy = transport_class_to_phy(cdev); \
+ \
+ return snprintf(buf, 20, format_string, cast phy->field); \
+}
+
+#define sas_phy_simple_attr(field, name, format_string, type) \
+ sas_phy_show_simple(field, name, format_string, (type)) \
+static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
+
+#define sas_phy_show_protocol(field, name) \
+static ssize_t \
+show_sas_phy_##name(struct class_device *cdev, char *buf) \
+{ \
+ struct sas_phy *phy = transport_class_to_phy(cdev); \
+ \
+ if (!phy->field) \
+ return snprintf(buf, 20, "none\n"); \
+ return get_sas_protocol_names(phy->field, buf); \
+}
+
+#define sas_phy_protocol_attr(field, name) \
+ sas_phy_show_protocol(field, name) \
+static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
+
+#define sas_phy_show_linkspeed(field) \
+static ssize_t \
+show_sas_phy_##field(struct class_device *cdev, char *buf) \
+{ \
+ struct sas_phy *phy = transport_class_to_phy(cdev); \
+ \
+ return get_sas_linkspeed_names(phy->field, buf); \
+}
+
+#define sas_phy_linkspeed_attr(field) \
+ sas_phy_show_linkspeed(field) \
+static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
+
+static ssize_t
+show_sas_device_type(struct class_device *cdev, char *buf)
+{
+ struct sas_phy *phy = transport_class_to_phy(cdev);
+
+ if (!phy->identify.device_type)
+ return snprintf(buf, 20, "none\n");
+ return get_sas_device_type_names(phy->identify.device_type, buf);
+}
+
+static CLASS_DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
+
+sas_phy_protocol_attr(identify.initiator_port_protocols,
+ initiator_port_protocols);
+sas_phy_protocol_attr(identify.target_port_protocols,
+ target_port_protocols);
+sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
+ unsigned long long);
+sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
+sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", u8);
+sas_phy_linkspeed_attr(negotiated_linkrate);
+sas_phy_linkspeed_attr(minimum_linkrate_hw);
+sas_phy_linkspeed_attr(minimum_linkrate);
+sas_phy_linkspeed_attr(maximum_linkrate_hw);
+sas_phy_linkspeed_attr(maximum_linkrate);
+
+
+static DECLARE_TRANSPORT_CLASS(sas_phy_class,
+ "sas_phy", NULL, NULL, NULL);
+
+static int sas_phy_match(struct attribute_container *cont, struct device *dev)
+{
+ struct Scsi_Host *shost;
+ struct sas_internal *i;
+
+ if (!scsi_is_sas_phy(dev))
+ return 0;
+ shost = dev_to_shost(dev->parent);
+
+ if (!shost->transportt)
+ return 0;
+ if (shost->transportt->host_attrs.ac.class !=
+ &sas_host_class.class)
+ return 0;
+
+ i = to_sas_internal(shost->transportt);
+ return &i->phy_attr_cont.ac == cont;
+}
+
+static void sas_phy_release(struct device *dev)
+{
+ struct sas_phy *phy = dev_to_phy(dev);
+
+ put_device(dev->parent);
+ kfree(phy);
+}
+
+/**
+ * sas_phy_alloc -- allocates and initialize a SAS PHY structure
+ * @parent: Parent device
+ * @number: Port number
+ *
+ * Allocates an SAS PHY structure. It will be added in the device tree
+ * below the device specified by @parent, which has to be either a Scsi_Host
+ * or sas_rphy.
+ *
+ * Returns:
+ * SAS PHY allocated or %NULL if the allocation failed.
+ */
+struct sas_phy *sas_phy_alloc(struct device *parent, int number)
+{
+ struct Scsi_Host *shost = dev_to_shost(parent);
+ struct sas_phy *phy;
+
+ phy = kmalloc(sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return NULL;
+ memset(phy, 0, sizeof(*phy));
+
+ get_device(parent);
+
+ phy->number = number;
+
+ device_initialize(&phy->dev);
+ phy->dev.parent = get_device(parent);
+ phy->dev.release = sas_phy_release;
+ sprintf(phy->dev.bus_id, "phy-%d:%d", shost->host_no, number);
+
+ transport_setup_device(&phy->dev);
+
+ return phy;
+}
+EXPORT_SYMBOL(sas_phy_alloc);
+
+/**
+ * sas_phy_add -- add a SAS PHY to the device hierachy
+ * @phy: The PHY to be added
+ *
+ * Publishes a SAS PHY to the rest of the system.
+ */
+int sas_phy_add(struct sas_phy *phy)
+{
+ int error;
+
+ error = device_add(&phy->dev);
+ if (!error) {
+ transport_add_device(&phy->dev);
+ transport_configure_device(&phy->dev);
+ }
+
+ return error;
+}
+EXPORT_SYMBOL(sas_phy_add);
+
+/**
+ * sas_phy_free -- free a SAS PHY
+ * @phy: SAS PHY to free
+ *
+ * Frees the specified SAS PHY.
+ *
+ * Note:
+ * This function must only be called on a PHY that has not
+ * sucessfully been added using sas_phy_add().
+ */
+void sas_phy_free(struct sas_phy *phy)
+{
+ transport_destroy_device(&phy->dev);
+ put_device(phy->dev.parent);
+ put_device(phy->dev.parent);
+ put_device(phy->dev.parent);
+ kfree(phy);
+}
+EXPORT_SYMBOL(sas_phy_free);
+
+/**
+ * sas_phy_delete -- remove SAS PHY
+ * @phy: SAS PHY to remove
+ *
+ * Removes the specified SAS PHY. If the SAS PHY has an
+ * associated remote PHY it is removed before.
+ */
+void
+sas_phy_delete(struct sas_phy *phy)
+{
+ struct device *dev = &phy->dev;
+
+ if (phy->rphy)
+ sas_rphy_delete(phy->rphy);
+
+ transport_remove_device(dev);
+ device_del(dev);
+ transport_destroy_device(dev);
+ put_device(dev->parent);
+}
+EXPORT_SYMBOL(sas_phy_delete);
+
+/**
+ * scsi_is_sas_phy -- check if a struct device represents a SAS PHY
+ * @dev: device to check
+ *
+ * Returns:
+ * %1 if the device represents a SAS PHY, %0 else
+ */
+int scsi_is_sas_phy(const struct device *dev)
+{
+ return dev->release == sas_phy_release;
+}
+EXPORT_SYMBOL(scsi_is_sas_phy);
+
+/*
+ * SAS remote PHY attributes.
+ */
+
+#define sas_rphy_show_simple(field, name, format_string, cast) \
+static ssize_t \
+show_sas_rphy_##name(struct class_device *cdev, char *buf) \
+{ \
+ struct sas_rphy *rphy = transport_class_to_rphy(cdev); \
+ \
+ return snprintf(buf, 20, format_string, cast rphy->field); \
+}
+
+#define sas_rphy_simple_attr(field, name, format_string, type) \
+ sas_rphy_show_simple(field, name, format_string, (type)) \
+static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO, \
+ show_sas_rphy_##name, NULL)
+
+#define sas_rphy_show_protocol(field, name) \
+static ssize_t \
+show_sas_rphy_##name(struct class_device *cdev, char *buf) \
+{ \
+ struct sas_rphy *rphy = transport_class_to_rphy(cdev); \
+ \
+ if (!rphy->field) \
+ return snprintf(buf, 20, "none\n"); \
+ return get_sas_protocol_names(rphy->field, buf); \
+}
+
+#define sas_rphy_protocol_attr(field, name) \
+ sas_rphy_show_protocol(field, name) \
+static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO, \
+ show_sas_rphy_##name, NULL)
+
+static ssize_t
+show_sas_rphy_device_type(struct class_device *cdev, char *buf)
+{
+ struct sas_rphy *rphy = transport_class_to_rphy(cdev);
+
+ if (!rphy->identify.device_type)
+ return snprintf(buf, 20, "none\n");
+ return get_sas_device_type_names(
+ rphy->identify.device_type, buf);
+}
+
+static SAS_CLASS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
+ show_sas_rphy_device_type, NULL);
+
+sas_rphy_protocol_attr(identify.initiator_port_protocols,
+ initiator_port_protocols);
+sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
+sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
+ unsigned long long);
+sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
+
+static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
+ "sas_rphy", NULL, NULL, NULL);
+
+static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
+{
+ struct Scsi_Host *shost;
+ struct sas_internal *i;
+
+ if (!scsi_is_sas_rphy(dev))
+ return 0;
+ shost = dev_to_shost(dev->parent->parent);
+
+ if (!shost->transportt)
+ return 0;
+ if (shost->transportt->host_attrs.ac.class !=
+ &sas_host_class.class)
+ return 0;
+
+ i = to_sas_internal(shost->transportt);
+ return &i->rphy_attr_cont.ac == cont;
+}
+
+static void sas_rphy_release(struct device *dev)
+{
+ struct sas_rphy *rphy = dev_to_rphy(dev);
+
+ put_device(dev->parent);
+ kfree(rphy);
+}
+
+/**
+ * sas_rphy_alloc -- allocates and initialize a SAS remote PHY structure
+ * @parent: SAS PHY this remote PHY is conneted to
+ *
+ * Allocates an SAS remote PHY structure, connected to @parent.
+ *
+ * Returns:
+ * SAS PHY allocated or %NULL if the allocation failed.
+ */
+struct sas_rphy *sas_rphy_alloc(struct sas_phy *parent)
+{
+ struct Scsi_Host *shost = dev_to_shost(&parent->dev);
+ struct sas_rphy *rphy;
+
+ rphy = kmalloc(sizeof(*rphy), GFP_KERNEL);
+ if (!rphy) {
+ put_device(&parent->dev);
+ return NULL;
+ }
+ memset(rphy, 0, sizeof(*rphy));
+
+ device_initialize(&rphy->dev);
+ rphy->dev.parent = get_device(&parent->dev);
+ rphy->dev.release = sas_rphy_release;
+ sprintf(rphy->dev.bus_id, "rphy-%d:%d",
+ shost->host_no, parent->number);
+ transport_setup_device(&rphy->dev);
+
+ return rphy;
+}
+EXPORT_SYMBOL(sas_rphy_alloc);
+
+/**
+ * sas_rphy_add -- add a SAS remote PHY to the device hierachy
+ * @rphy: The remote PHY to be added
+ *
+ * Publishes a SAS remote PHY to the rest of the system.
+ */
+int sas_rphy_add(struct sas_rphy *rphy)
+{
+ struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
+ struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
+ struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+ struct sas_identify *identify = &rphy->identify;
+ int error;
+
+ if (parent->rphy)
+ return -ENXIO;
+ parent->rphy = rphy;
+
+ error = device_add(&rphy->dev);
+ if (error)
+ return error;
+ transport_add_device(&rphy->dev);
+ transport_configure_device(&rphy->dev);
+
+ spin_lock(&sas_host->lock);
+ list_add_tail(&rphy->list, &sas_host->rphy_list);
+ if (identify->device_type == SAS_END_DEVICE &&
+ (identify->target_port_protocols &
+ (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
+ rphy->scsi_target_id = sas_host->next_target_id++;
+ else
+ rphy->scsi_target_id = -1;
+ spin_unlock(&sas_host->lock);
+
+ if (rphy->scsi_target_id != -1) {
+ scsi_scan_target(&rphy->dev, parent->number,
+ rphy->scsi_target_id, ~0, 0);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(sas_rphy_add);
+
+/**
+ * sas_rphy_free -- free a SAS remote PHY
+ * @rphy SAS remote PHY to free
+ *
+ * Frees the specified SAS remote PHY.
+ *
+ * Note:
+ * This function must only be called on a remote
+ * PHY that has not sucessfully been added using
+ * sas_rphy_add().
+ */
+void sas_rphy_free(struct sas_rphy *rphy)
+{
+ struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
+ struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+
+ spin_lock(&sas_host->lock);
+ list_del(&rphy->list);
+ spin_unlock(&sas_host->lock);
+
+ transport_destroy_device(&rphy->dev);
+ put_device(rphy->dev.parent);
+ put_device(rphy->dev.parent);
+ put_device(rphy->dev.parent);
+ kfree(rphy);
+}
+EXPORT_SYMBOL(sas_rphy_free);
+
+/**
+ * sas_rphy_delete -- remove SAS remote PHY
+ * @rphy: SAS remote PHY to remove
+ *
+ * Removes the specified SAS remote PHY.
+ */
+void
+sas_rphy_delete(struct sas_rphy *rphy)
+{
+ struct device *dev = &rphy->dev;
+ struct sas_phy *parent = dev_to_phy(dev->parent);
+ struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
+ struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+
+ transport_destroy_device(&rphy->dev);
+
+ scsi_remove_target(&rphy->dev);
+
+ spin_lock(&sas_host->lock);
+ list_del(&rphy->list);
+ spin_unlock(&sas_host->lock);
+
+ transport_remove_device(dev);
+ device_del(dev);
+ transport_destroy_device(dev);
+ put_device(&parent->dev);
+}
+EXPORT_SYMBOL(sas_rphy_delete);
+
+/**
+ * scsi_is_sas_rphy -- check if a struct device represents a SAS remote PHY
+ * @dev: device to check
+ *
+ * Returns:
+ * %1 if the device represents a SAS remote PHY, %0 else
+ */
+int scsi_is_sas_rphy(const struct device *dev)
+{
+ return dev->release == sas_rphy_release;
+}
+EXPORT_SYMBOL(scsi_is_sas_rphy);
+
+
+/*
+ * SCSI scan helper
+ */
+
+static struct device *sas_target_parent(struct Scsi_Host *shost,
+ int channel, uint id)
+{
+ struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+ struct sas_rphy *rphy;
+ struct device *dev = NULL;
+
+ spin_lock(&sas_host->lock);
+ list_for_each_entry(rphy, &sas_host->rphy_list, list) {
+ struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
+ if (parent->number == channel &&
+ rphy->scsi_target_id == id)
+ dev = &rphy->dev;
+ }
+ spin_unlock(&sas_host->lock);
+
+ return dev;
+}
+
+
+/*
+ * Setup / Teardown code
+ */
+
+#define SETUP_RPORT_ATTRIBUTE(field) \
+ i->private_rphy_attrs[count] = class_device_attr_##field; \
+ i->private_rphy_attrs[count].attr.mode = S_IRUGO; \
+ i->private_rphy_attrs[count].store = NULL; \
+ i->rphy_attrs[count] = &i->private_rphy_attrs[count]; \
+ count++
+
+#define SETUP_PORT_ATTRIBUTE(field) \
+ i->private_phy_attrs[count] = class_device_attr_##field; \
+ i->private_phy_attrs[count].attr.mode = S_IRUGO; \
+ i->private_phy_attrs[count].store = NULL; \
+ i->phy_attrs[count] = &i->private_phy_attrs[count]; \
+ count++
+
+
+/**
+ * sas_attach_transport -- instantiate SAS transport template
+ * @ft: SAS transport class function template
+ */
+struct scsi_transport_template *
+sas_attach_transport(struct sas_function_template *ft)
+{
+ struct sas_internal *i;
+ int count;
+
+ i = kmalloc(sizeof(struct sas_internal), GFP_KERNEL);
+ if (!i)
+ return NULL;
+ memset(i, 0, sizeof(struct sas_internal));
+
+ i->t.target_parent = sas_target_parent;
+
+ i->t.host_attrs.ac.attrs = &i->host_attrs[0];
+ i->t.host_attrs.ac.class = &sas_host_class.class;
+ i->t.host_attrs.ac.match = sas_host_match;
+ transport_container_register(&i->t.host_attrs);
+ i->t.host_size = sizeof(struct sas_host_attrs);
+
+ i->phy_attr_cont.ac.class = &sas_phy_class.class;
+ i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
+ i->phy_attr_cont.ac.match = sas_phy_match;
+ transport_container_register(&i->phy_attr_cont);
+
+ i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
+ i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
+ i->rphy_attr_cont.ac.match = sas_rphy_match;
+ transport_container_register(&i->rphy_attr_cont);
+
+ i->f = ft;
+
+ count = 0;
+ i->host_attrs[count] = NULL;
+
+ count = 0;
+ SETUP_PORT_ATTRIBUTE(initiator_port_protocols);
+ SETUP_PORT_ATTRIBUTE(target_port_protocols);
+ SETUP_PORT_ATTRIBUTE(device_type);
+ SETUP_PORT_ATTRIBUTE(sas_address);
+ SETUP_PORT_ATTRIBUTE(phy_identifier);
+ SETUP_PORT_ATTRIBUTE(port_identifier);
+ SETUP_PORT_ATTRIBUTE(negotiated_linkrate);
+ SETUP_PORT_ATTRIBUTE(minimum_linkrate_hw);
+ SETUP_PORT_ATTRIBUTE(minimum_linkrate);
+ SETUP_PORT_ATTRIBUTE(maximum_linkrate_hw);
+ SETUP_PORT_ATTRIBUTE(maximum_linkrate);
+ i->phy_attrs[count] = NULL;
+
+ count = 0;
+ SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
+ SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
+ SETUP_RPORT_ATTRIBUTE(rphy_device_type);
+ SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
+ SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
+ i->rphy_attrs[count] = NULL;
+
+ return &i->t;
+}
+EXPORT_SYMBOL(sas_attach_transport);
+
+/**
+ * sas_release_transport -- release SAS transport template instance
+ * @t: transport template instance
+ */
+void sas_release_transport(struct scsi_transport_template *t)
+{
+ struct sas_internal *i = to_sas_internal(t);
+
+ transport_container_unregister(&i->t.host_attrs);
+ transport_container_unregister(&i->phy_attr_cont);
+ transport_container_unregister(&i->rphy_attr_cont);
+
+ kfree(i);
+}
+EXPORT_SYMBOL(sas_release_transport);
+
+static __init int sas_transport_init(void)
+{
+ int error;
+
+ error = transport_class_register(&sas_host_class);
+ if (error)
+ goto out;
+ error = transport_class_register(&sas_phy_class);
+ if (error)
+ goto out_unregister_transport;
+ error = transport_class_register(&sas_rphy_class);
+ if (error)
+ goto out_unregister_phy;
+
+ return 0;
+
+ out_unregister_phy:
+ transport_class_unregister(&sas_phy_class);
+ out_unregister_transport:
+ transport_class_unregister(&sas_host_class);
+ out:
+ return error;
+
+}
+
+static void __exit sas_transport_exit(void)
+{
+ transport_class_unregister(&sas_host_class);
+ transport_class_unregister(&sas_phy_class);
+ transport_class_unregister(&sas_rphy_class);
+}
+
+MODULE_AUTHOR("Christoph Hellwig");
+MODULE_DESCRIPTION("SAS Transphy Attributes");
+MODULE_LICENSE("GPL");
+
+module_init(sas_transport_init);
+module_exit(sas_transport_exit);
#ifdef CONFIG_SCSI_PROC_FS
#include <linux/proc_fs.h>
-static char *sg_version_date = "20050901";
+static char *sg_version_date = "20050908";
static int sg_proc_init(void);
static void sg_proc_cleanup(void);
sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
sfp->mmap_called = 1;
}
- vma->vm_flags |= (VM_RESERVED | VM_IO);
+ vma->vm_flags |= VM_RESERVED;
vma->vm_private_data = sfp;
vma->vm_ops = &sg_mmap_vm_ops;
return 0;
extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
uint, uint, uint, void *hostdata);
-#define scsi_add_device(host, channel, target, lun) \
- __scsi_add_device(host, channel, target, lun, NULL)
+extern int scsi_add_device(struct Scsi_Host *host, uint channel,
+ uint target, uint lun);
extern void scsi_remove_device(struct scsi_device *);
extern int scsi_device_cancel(struct scsi_device *, int);
void fc_remote_port_unblock(struct fc_rport *rport);
int scsi_is_fc_rport(const struct device *);
+static inline u64 wwn_to_u64(u8 *wwn)
+{
+ return (u64)wwn[0] << 56 | (u64)wwn[1] << 48 |
+ (u64)wwn[2] << 40 | (u64)wwn[3] << 32 |
+ (u64)wwn[4] << 24 | (u64)wwn[5] << 16 |
+ (u64)wwn[6] << 8 | (u64)wwn[7];
+}
+
#endif /* SCSI_TRANSPORT_FC_H */
--- /dev/null
+#ifndef SCSI_TRANSPORT_SAS_H
+#define SCSI_TRANSPORT_SAS_H
+
+#include <linux/transport_class.h>
+#include <linux/types.h>
+
+struct scsi_transport_template;
+struct sas_rphy;
+
+
+enum sas_device_type {
+ SAS_PHY_UNUSED,
+ SAS_END_DEVICE,
+ SAS_EDGE_EXPANDER_DEVICE,
+ SAS_FANOUT_EXPANDER_DEVICE,
+};
+
+enum sas_protocol {
+ SAS_PROTOCOL_SATA = 0x01,
+ SAS_PROTOCOL_SMP = 0x02,
+ SAS_PROTOCOL_STP = 0x04,
+ SAS_PROTOCOL_SSP = 0x08,
+};
+
+enum sas_linkrate {
+ SAS_LINK_RATE_UNKNOWN,
+ SAS_PHY_DISABLED,
+ SAS_LINK_RATE_FAILED,
+ SAS_SATA_SPINUP_HOLD,
+ SAS_SATA_PORT_SELECTOR,
+ SAS_LINK_RATE_1_5_GBPS,
+ SAS_LINK_RATE_3_0_GBPS,
+ SAS_LINK_VIRTUAL,
+};
+
+struct sas_identify {
+ enum sas_device_type device_type;
+ enum sas_protocol initiator_port_protocols;
+ enum sas_protocol target_port_protocols;
+ u64 sas_address;
+ u8 phy_identifier;
+};
+
+/* The functions by which the transport class and the driver communicate */
+struct sas_function_template {
+};
+
+struct sas_phy {
+ struct device dev;
+ int number;
+ struct sas_identify identify;
+ enum sas_linkrate negotiated_linkrate;
+ enum sas_linkrate minimum_linkrate_hw;
+ enum sas_linkrate minimum_linkrate;
+ enum sas_linkrate maximum_linkrate_hw;
+ enum sas_linkrate maximum_linkrate;
+ u8 port_identifier;
+ struct sas_rphy *rphy;
+};
+
+#define dev_to_phy(d) \
+ container_of((d), struct sas_phy, dev)
+#define transport_class_to_phy(cdev) \
+ dev_to_phy((cdev)->dev)
+#define phy_to_shost(phy) \
+ dev_to_shost((phy)->dev.parent)
+
+struct sas_rphy {
+ struct device dev;
+ struct sas_identify identify;
+ struct list_head list;
+ u32 scsi_target_id;
+};
+
+#define dev_to_rphy(d) \
+ container_of((d), struct sas_rphy, dev)
+#define transport_class_to_rphy(cdev) \
+ dev_to_rphy((cdev)->dev)
+#define rphy_to_shost(rphy) \
+ dev_to_shost((rphy)->dev.parent)
+
+extern void sas_remove_host(struct Scsi_Host *);
+
+extern struct sas_phy *sas_phy_alloc(struct device *, int);
+extern void sas_phy_free(struct sas_phy *);
+extern int sas_phy_add(struct sas_phy *);
+extern void sas_phy_delete(struct sas_phy *);
+extern int scsi_is_sas_phy(const struct device *);
+
+extern struct sas_rphy *sas_rphy_alloc(struct sas_phy *);
+void sas_rphy_free(struct sas_rphy *);
+extern int sas_rphy_add(struct sas_rphy *);
+extern void sas_rphy_delete(struct sas_rphy *);
+extern int scsi_is_sas_rphy(const struct device *);
+
+extern struct scsi_transport_template *
+sas_attach_transport(struct sas_function_template *);
+extern void sas_release_transport(struct scsi_transport_template *);
+
+#endif /* SCSI_TRANSPORT_SAS_H */
git.openpandora.org / pandora-kernel.git / commitdiff