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BranchCommit messageAuthorAge
archive/unc-master-3.0P-FP: fix BUG_ON releated to priority inheritanceBjoern Brandenburg13 years
archived-2013.1uncachedev: mmap memory that is not cached by CPUsGlenn Elliott12 years
archived-private-masterMerge branch 'wip-2.6.34' into old-private-masterAndrea Bastoni15 years
archived-semi-partMerge branch 'wip-semi-part' of ssh://cvs/cvs/proj/litmus/repo/litmus2010 int...Andrea Bastoni15 years
demoFurther refinementsJonathan Herman14 years
ecrts-pgm-finalMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
ecrts14-pgm-finalMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
gpusync-rtss12Final GPUSync implementation.Glenn Elliott12 years
gpusync/stagingRename IKGLP R2DGLP.Glenn Elliott12 years
linux-tipMerge branch 'slab/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/p...Linus Torvalds15 years
litmus2008-patch-seriesadd i386 feather-trace implementationBjoern B. Brandenburg16 years
masterPSN-EDF: use inferred_sporadic_job_release_atBjoern Brandenburg9 years
pgmmake it compileGlenn Elliott12 years
prop/litmus-signalsInfrastructure for Litmus signals.Glenn Elliott13 years
prop/robust-tie-breakFixed bug in edf_higher_prio().Glenn Elliott13 years
stagingFix tracepoint compilation errorFelipe Cerqueira13 years
test9/23/2016Namhoon Kim9 years
tracing-develTest kernel tracing events capabilitiesAndrea Bastoni16 years
v2.6.34-with-arm-patchessmsc911x: Add spinlocks around registers accessCatalin Marinas15 years
v2015.1Add ARM syscall def for get_current_budgetBjoern Brandenburg10 years
wip-2011.2-bbbLitmus core: simplify np-section protocolBjoern B. Brandenburg14 years
wip-2011.2-bbb-traceRefactor sched_trace_log_message() -> debug_trace_log_message()Andrea Bastoni14 years
wip-2012.3-gpuSOBLIV draining support for C-EDF.Glenn Elliott12 years
wip-2012.3-gpu-preportpick up last C-RM fileGlenn Elliott12 years
wip-2012.3-gpu-rtss13Fix critical bug in GPU tracker.Glenn Elliott12 years
wip-2012.3-gpu-sobliv-budget-w-ksharkProper sobliv draining and many bug fixes.Glenn Elliott12 years
wip-aedzl-finalMake it easier to compile AEDZL interfaces in liblitmus.Glenn Elliott15 years
wip-aedzl-revisedAdd sched_trace data for Apative EDZLGlenn Elliott15 years
wip-arbit-deadlineFix compilation bug.Glenn Elliott13 years
wip-aux-tasksDescription of refined aux task inheritance.Glenn Elliott13 years
wip-bbbGSN-EDF & Core: improve debug TRACE'ing for NP sectionsBjoern B. Brandenburg14 years
wip-bbb-prio-donuse correct timestampBjoern B. Brandenburg14 years
wip-better-breakImplement hash-based EDF tie-breaking.Glenn Elliott13 years
wip-binary-heapMake C-EDF work with simplified binheap_deleteGlenn Elliott13 years
wip-budgetAdded support for choices in budget policy enforcement.Glenn Elliott15 years
wip-colorSummarize schedulability with final recordJonathan Herman13 years
wip-color-jlhsched_color: Fixed two bugs causing crashing on experiment restart and a rare...Jonathan Herman13 years
wip-d10-hz1000Enable HZ=1000 on District 10Bjoern B. Brandenburg15 years
wip-default-clusteringFeature: Make default C-EDF clustering compile-time configurable.Glenn Elliott15 years
wip-dissipation-jericksoUpdate from 2.6.36 to 2.6.36.4Jeremy Erickson11 years
wip-dissipation2-jericksoUpdate 2.6.36 to 2.6.36.4Jeremy Erickson11 years
wip-ecrts14-pgmMerge branch 'wip-ecrts14-pgm' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus-r...Glenn Elliott12 years
wip-edf-hsblast tested versionJonathan Herman14 years
wip-edf-osLookup table EDF-osJeremy Erickson12 years
wip-edf-tie-breakMerge branch 'wip-edf-tie-break' of ssh://rtsrv.cs.unc.edu/home/litmus/litmus...Glenn Elliott13 years
wip-edzl-critiqueUse hr_timer's active checks instead of having own flag.Glenn Elliott15 years
wip-edzl-finalImplementation of the EDZL scheduler.Glenn Elliott15 years
wip-edzl-revisedClean up comments.Glenn Elliott15 years
wip-eventsAdded support for tracing arbitrary actions.Jonathan Herman15 years
wip-extra-debugDBG: add additional tracingBjoern B. Brandenburg15 years
wip-fix-switch-jericksoAttempt to fix race condition with plugin switchingJeremy Erickson15 years
wip-fix3sched: show length of runqueue clock deactivation in /proc/sched_debugBjoern B. Brandenburg15 years
wip-fmlp-dequeueImprove FMLP queue management.Glenn Elliott14 years
wip-ft-irq-flagFeather-Trace: keep track of interrupt-related interference.Bjoern B. Brandenburg14 years
wip-gpu-cleanupEnable sched_trace log injection from userspaceGlenn Elliott13 years
wip-gpu-interruptsRemove option for threading of all softirqs.Glenn Elliott14 years
wip-gpu-rtas12Generalized GPU cost predictors + EWMA. (untested)Glenn Elliott13 years
wip-gpu-rtss12Final GPUSync implementation.Glenn Elliott13 years
wip-gpu-rtss12-srpexperimental changes to support GPUs under SRPGlenn Elliott13 years
wip-gpusync-mergeCleanup priority tracking for budget enforcement.Glenn Elliott12 years
wip-ikglpMove RSM and IKGLP imp. to own .c filesGlenn Elliott13 years
wip-k-fmlpMerge branch 'mpi-master' into wip-k-fmlpGlenn Elliott14 years
wip-kernel-coloringAdded recolor syscallNamhoon Kim7 years
wip-kernthreadsKludge work-queue processing into klitirqd.Glenn Elliott15 years
wip-klmirqd-to-auxAllow klmirqd threads to be given names.Glenn Elliott13 years
wip-ksharkMerge branch 'mpi-staging' into wip-ksharkJonathan Herman13 years
wip-litmus-3.2Merge commit 'v3.2' into litmus-stagingAndrea Bastoni13 years
wip-litmus2011.2Cleanup: Coding conformance for affinity stuff.Glenn Elliott14 years
wip-litmus3.0-2011.2Feather-Trace: keep track of interrupt-related interference.Bjoern B. Brandenburg14 years
wip-master-2.6.33-rtAvoid deadlock when switching task policy to BACKGROUND (ugly)Andrea Bastoni15 years
wip-mcRemoved ARM-specific hacks which disabled less common mixed-criticality featu...Jonathan Herman12 years
wip-mc-bipasaMC-EDF addedbipasa chattopadhyay13 years
wip-mc-jericksoSplit C/D queuesJeremy Erickson15 years
wip-mc2-cache-slackManually patched mc^2 related codeMing Yang10 years
wip-mcrit-maccosmeticMac Mollison15 years
wip-merge-3.0Prevent Linux to send IPI and queue tasks on remote CPUs.Andrea Bastoni14 years
wip-merge-v3.0Prevent Linux to send IPI and queue tasks on remote CPUs.Andrea Bastoni14 years
wip-migration-affinityNULL affinity dereference in C-EDF.Glenn Elliott14 years
wip-mmap-uncacheshare branch with othersGlenn Elliott13 years
wip-modechangeRTSS 2017 submissionNamhoon Kim8 years
wip-nested-lockingAppears to be working.Bryan Ward12 years
wip-omlp-gedfFirst implementation of G-OMLP.Glenn Elliott15 years
wip-paiSome cleanup of PAIGlenn Elliott14 years
wip-percore-lib9/21/2016Namhoon Kim9 years
wip-performanceCONFIG_DONT_PREEMPT_ON_TIE: Don't preeempt a scheduled task on priority tie.Glenn Elliott14 years
wip-pgmAdd PGM support to C-FLGlenn Elliott12 years
wip-pgm-splitFirst draft of C-FL-splitNamhoon Kim12 years
wip-pm-ovdAdd preemption-and-migration overhead tracing supportAndrea Bastoni15 years
wip-prio-inhP-EDF updated to use the generic pi framework.Glenn Elliott15 years
wip-prioq-dglBUG FIX: Support DGLs with PRIOQ_MUTEXGlenn Elliott13 years
wip-refactored-gedfGeneralizd architecture for GEDF-style scheduelrs to reduce code redundancy.Glenn Elliott15 years
wip-release-master-fixbugfix: release master CPU must signal task was pickedBjoern B. Brandenburg14 years
wip-robust-tie-breakEDF priority tie-breaks.Glenn Elliott13 years
wip-rt-ksharkMove task time accounting into the complete_job method.Jonathan Herman13 years
wip-rtas12-pgmScheduling of PGM jobs.Glenn Elliott13 years
wip-semi-partFix compile error with newer GCCJeremy Erickson12 years
wip-semi-part-edfos-jericksoUse initial CPU set by clientJeremy Erickson12 years
wip-shared-libTODO: Fix condition checks in replicate_page_move_mapping()Namhoon Kim9 years
wip-shared-lib2RTAS 2017 Submission ver.Namhoon Kim9 years
wip-shared-memInitial commit for shared libraryNamhoon Kim9 years
wip-splitting-jericksoFix release behaviorJeremy Erickson13 years
wip-splitting-omlp-jericksoBjoern's Dissertation Code with Priority DonationJeremy Erickson13 years
wip-stage-binheapAn efficient binary heap implementation.Glenn Elliott13 years
wip-sun-portDynamic memory allocation and clean exit for FeatherTraceChristopher Kenna15 years
wip-timer-tracebugfix: C-EDF, clear scheduled field of the correct CPU upon task_exitAndrea Bastoni15 years
wip-tracepointsAdd kernel-style events for sched_trace_XXX() functionsAndrea Bastoni14 years
 
TagDownloadAuthorAge
2015.1commit 8e51b37822...Bjoern Brandenburg10 years
2013.1commit bcaacec1ca...Glenn Elliott12 years
2012.3commit c158b5fbe4...Jonathan Herman13 years
2012.2commit b53c479a0f...Glenn Elliott13 years
2012.1commit 83b11ea1c6...Bjoern B. Brandenburg14 years
rtas12-mc-beta-expcommit 8e236ee20f...Christopher Kenna14 years
2011.1commit d11808b5c6...Christopher Kenna15 years
v2.6.37-rc4commit e8a7e48bb2...Linus Torvalds15 years
v2.6.37-rc3commit 3561d43fd2...Linus Torvalds15 years
v2.6.37-rc2commit e53beacd23...Linus Torvalds15 years
v2.6.37-rc1commit c8ddb2713c...Linus Torvalds15 years
v2.6.36commit f6f94e2ab1...Linus Torvalds15 years
2010.2commit 5c5456402d...Bjoern B. Brandenburg15 years
v2.6.36-rc8commit cd07202cc8...Linus Torvalds15 years
v2.6.36-rc7commit cb655d0f3d...Linus Torvalds15 years
v2.6.36-rc6commit 899611ee7d...Linus Torvalds15 years
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2010.1commit 7c1ff4c544...Andrea Bastoni15 years
v2.6.34commit e40152ee1e...Linus Torvalds15 years
v2.6.33.4commit 4640b4e7d9...Greg Kroah-Hartman15 years
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v2.6.15-rc3commit 624f54be20...Linus Torvalds20 years
v2.6.15-rc2commit 3bedff1d73...Linus Torvalds20 years
v2.6.15-rc1commit cd52d1ee9a...Linus Torvalds20 years
v2.6.14commit 741b2252a5...Linus Torvalds20 years
v2.6.14-rc5commit 93918e9afc...Linus Torvalds20 years
v2.6.14-rc4commit 907a426179...Linus Torvalds20 years
v2.6.14-rc3commit 1c9426e8a5...Linus Torvalds20 years
v2.6.14-rc2commit 676d55ae30...Linus Torvalds20 years
v2.6.14-rc1commit 2f4ba45a75...Linus Torvalds20 years
v2.6.13commit 02b3e4e2d7...Linus Torvalds20 years
v2.6.13-rc7commit 0572e3da3f...Linus Torvalds20 years
v2.6.13-rc6commit 6fc32179de...Linus Torvalds20 years
v2.6.13-rc5commit 9a351e30d7...Linus Torvalds20 years
v2.6.13-rc4commit 6395352334...Linus Torvalds20 years
v2.6.11tree c39ae07f39...
v2.6.11-treetree c39ae07f39...
v2.6.12commit 9ee1c939d1...
v2.6.12-rc2commit 1da177e4c3...
v2.6.12-rc3commit a2755a80f4...
v2.6.12-rc4commit 88d7bd8cb9...
v2.6.12-rc5commit 2a24ab628a...
v2.6.12-rc6commit 7cef5677ef...
v2.6.13-rc1commit 4c91aedb75...
v2.6.13-rc2commit a18bcb7450...
v2.6.13-rc3commit c32511e271...
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-15 09:14:20 -0400
t *shost = sdev->host; struct scsi_target *starget = scsi_target(sdev); unsigned long flags; spin_lock_irqsave(shost->host_lock, flags); shost->host_busy--; starget->target_busy--; if (unlikely(scsi_host_in_recovery(shost) && (shost->host_failed || shost->host_eh_scheduled))) scsi_eh_wakeup(shost); spin_unlock(shost->host_lock); spin_lock(sdev->request_queue->queue_lock); sdev->device_busy--; spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); } /* * Called for single_lun devices on IO completion. Clear starget_sdev_user, * and call blk_run_queue for all the scsi_devices on the target - * including current_sdev first. * * Called with *no* scsi locks held. */ static void scsi_single_lun_run(struct scsi_device *current_sdev) { struct Scsi_Host *shost = current_sdev->host; struct scsi_device *sdev, *tmp; struct scsi_target *starget = scsi_target(current_sdev); unsigned long flags; spin_lock_irqsave(shost->host_lock, flags); starget->starget_sdev_user = NULL; spin_unlock_irqrestore(shost->host_lock, flags); /* * Call blk_run_queue for all LUNs on the target, starting with * current_sdev. We race with others (to set starget_sdev_user), * but in most cases, we will be first. Ideally, each LU on the * target would get some limited time or requests on the target. */ blk_run_queue(current_sdev->request_queue); spin_lock_irqsave(shost->host_lock, flags); if (starget->starget_sdev_user) goto out; list_for_each_entry_safe(sdev, tmp, &starget->devices, same_target_siblings) { if (sdev == current_sdev) continue; if (scsi_device_get(sdev)) continue; spin_unlock_irqrestore(shost->host_lock, flags); blk_run_queue(sdev->request_queue); spin_lock_irqsave(shost->host_lock, flags); scsi_device_put(sdev); } out: spin_unlock_irqrestore(shost->host_lock, flags); } static inline int scsi_device_is_busy(struct scsi_device *sdev) { if (sdev->device_busy >= sdev->queue_depth || sdev->device_blocked) return 1; return 0; } static inline int scsi_target_is_busy(struct scsi_target *starget) { return ((starget->can_queue > 0 && starget->target_busy >= starget->can_queue) || starget->target_blocked); } static inline int scsi_host_is_busy(struct Scsi_Host *shost) { if ((shost->can_queue > 0 && shost->host_busy >= shost->can_queue) || shost->host_blocked || shost->host_self_blocked) return 1; return 0; } /* * Function: scsi_run_queue() * * Purpose: Select a proper request queue to serve next * * Arguments: q - last request's queue * * Returns: Nothing * * Notes: The previous command was completely finished, start * a new one if possible. */ static void scsi_run_queue(struct request_queue *q) { struct scsi_device *sdev = q->queuedata; struct Scsi_Host *shost = sdev->host; LIST_HEAD(starved_list); unsigned long flags; if (scsi_target(sdev)->single_lun) scsi_single_lun_run(sdev); spin_lock_irqsave(shost->host_lock, flags); list_splice_init(&shost->starved_list, &starved_list); while (!list_empty(&starved_list)) { int flagset; /* * As long as shost is accepting commands and we have * starved queues, call blk_run_queue. scsi_request_fn * drops the queue_lock and can add us back to the * starved_list. * * host_lock protects the starved_list and starved_entry. * scsi_request_fn must get the host_lock before checking * or modifying starved_list or starved_entry. */ if (scsi_host_is_busy(shost)) break; sdev = list_entry(starved_list.next, struct scsi_device, starved_entry); list_del_init(&sdev->starved_entry); if (scsi_target_is_busy(scsi_target(sdev))) { list_move_tail(&sdev->starved_entry, &shost->starved_list); continue; } spin_unlock(shost->host_lock); spin_lock(sdev->request_queue->queue_lock); flagset = test_bit(QUEUE_FLAG_REENTER, &q->queue_flags) && !test_bit(QUEUE_FLAG_REENTER, &sdev->request_queue->queue_flags); if (flagset) queue_flag_set(QUEUE_FLAG_REENTER, sdev->request_queue); __blk_run_queue(sdev->request_queue); if (flagset) queue_flag_clear(QUEUE_FLAG_REENTER, sdev->request_queue); spin_unlock(sdev->request_queue->queue_lock); spin_lock(shost->host_lock); } /* put any unprocessed entries back */ list_splice(&starved_list, &shost->starved_list); spin_unlock_irqrestore(shost->host_lock, flags); blk_run_queue(q); } /* * Function: scsi_requeue_command() * * Purpose: Handle post-processing of completed commands. * * Arguments: q - queue to operate on * cmd - command that may need to be requeued. * * Returns: Nothing * * Notes: After command completion, there may be blocks left * over which weren't finished by the previous command * this can be for a number of reasons - the main one is * 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; spin_lock_irqsave(q->queue_lock, flags); scsi_unprep_request(req); blk_requeue_request(q, req); spin_unlock_irqrestore(q->queue_lock, flags); scsi_run_queue(q); } void scsi_next_command(struct scsi_cmnd *cmd) { struct scsi_device *sdev = cmd->device; struct request_queue *q = sdev->request_queue; /* need to hold a reference on the device before we let go of the cmd */ get_device(&sdev->sdev_gendev); scsi_put_command(cmd); scsi_run_queue(q); /* ok to remove device now */ put_device(&sdev->sdev_gendev); } void scsi_run_host_queues(struct Scsi_Host *shost) { struct scsi_device *sdev; shost_for_each_device(sdev, shost) scsi_run_queue(sdev->request_queue); } static void __scsi_release_buffers(struct scsi_cmnd *, int); /* * Function: scsi_end_request() * * Purpose: Post-processing of completed commands (usually invoked at end * of upper level post-processing and scsi_io_completion). * * Arguments: cmd - command that is complete. * error - 0 if I/O indicates success, < 0 for I/O error. * bytes - number of bytes of completed I/O * requeue - indicates whether we should requeue leftovers. * * Lock status: Assumed that lock is not held upon entry. * * 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 error, int bytes, int requeue) { struct request_queue *q = cmd->device->request_queue; struct request *req = cmd->request; /* * If there are blocks left over at the end, set up the command * to queue the remainder of them. */ if (blk_end_request(req, error, bytes)) { int leftover = blk_rq_sectors(req) << 9; if (blk_pc_request(req)) leftover = req->resid_len; /* kill remainder if no retrys */ if (error && scsi_noretry_cmd(cmd)) blk_end_request(req, error, leftover); else { if (requeue) { /* * Bleah. Leftovers again. Stick the * leftovers in the front of the * queue, and goose the queue again. */ scsi_release_buffers(cmd); scsi_requeue_command(q, cmd); cmd = NULL; } return cmd; } } /* * This will goose the queue request function at the end, so we don't * need to worry about launching another command. */ __scsi_release_buffers(cmd, 0); scsi_next_command(cmd); return NULL; } static inline unsigned int scsi_sgtable_index(unsigned short nents) { unsigned int index; BUG_ON(nents > SCSI_MAX_SG_SEGMENTS); if (nents <= 8) index = 0; else index = get_count_order(nents) - 3; return index; } static void scsi_sg_free(struct scatterlist *sgl, unsigned int nents) { struct scsi_host_sg_pool *sgp; sgp = scsi_sg_pools + scsi_sgtable_index(nents); mempool_free(sgl, sgp->pool); } static struct scatterlist *scsi_sg_alloc(unsigned int nents, gfp_t gfp_mask) { struct scsi_host_sg_pool *sgp; sgp = scsi_sg_pools + scsi_sgtable_index(nents); return mempool_alloc(sgp->pool, gfp_mask); } static int scsi_alloc_sgtable(struct scsi_data_buffer *sdb, int nents, gfp_t gfp_mask) { int ret; BUG_ON(!nents); ret = __sg_alloc_table(&sdb->table, nents, SCSI_MAX_SG_SEGMENTS, gfp_mask, scsi_sg_alloc); if (unlikely(ret)) __sg_free_table(&sdb->table, SCSI_MAX_SG_SEGMENTS, scsi_sg_free); return ret; } static void scsi_free_sgtable(struct scsi_data_buffer *sdb) { __sg_free_table(&sdb->table, SCSI_MAX_SG_SEGMENTS, scsi_sg_free); } static void __scsi_release_buffers(struct scsi_cmnd *cmd, int do_bidi_check) { if (cmd->sdb.table.nents) scsi_free_sgtable(&cmd->sdb); memset(&cmd->sdb, 0, sizeof(cmd->sdb)); if (do_bidi_check && scsi_bidi_cmnd(cmd)) { struct scsi_data_buffer *bidi_sdb = cmd->request->next_rq->special; scsi_free_sgtable(bidi_sdb); kmem_cache_free(scsi_sdb_cache, bidi_sdb); cmd->request->next_rq->special = NULL; } if (scsi_prot_sg_count(cmd)) scsi_free_sgtable(cmd->prot_sdb); } /* * Function: scsi_release_buffers() * * Purpose: Completion processing for block device I/O requests. * * Arguments: cmd - command that we are bailing. * * Lock status: Assumed that no lock is held upon entry. * * Returns: Nothing * * Notes: In the event that an upper level driver rejects a * command, we must release resources allocated during * the __init_io() function. Primarily this would involve * the scatter-gather table, and potentially any bounce * buffers. */ void scsi_release_buffers(struct scsi_cmnd *cmd) { __scsi_release_buffers(cmd, 1); } EXPORT_SYMBOL(scsi_release_buffers); /* * Bidi commands Must be complete as a whole, both sides at once. If * part of the bytes were written and lld returned scsi_in()->resid * and/or scsi_out()->resid this information will be left in * req->resid_len and req->next_rq->resid_len. The upper-layer driver * can decide what to do with this information. */ static void scsi_end_bidi_request(struct scsi_cmnd *cmd) { struct request *req = cmd->request; req->resid_len = scsi_out(cmd)->resid; req->next_rq->resid_len = scsi_in(cmd)->resid; /* The req and req->next_rq have not been completed */ BUG_ON(blk_end_bidi_request(req, 0, blk_rq_bytes(req), blk_rq_bytes(req->next_rq))); scsi_release_buffers(cmd); /* * This will goose the queue request function at the end, so we don't * need to worry about launching another command. */ scsi_next_command(cmd); } /* * Function: scsi_io_completion() * * Purpose: Completion processing for block device I/O requests. * * Arguments: cmd - command that is finished. * * Lock status: Assumed that no lock is held upon entry. * * Returns: Nothing * * Notes: This function is matched in terms of capabilities to * the function that created the scatter-gather list. * In other words, if there are no bounce buffers * (the normal case for most drivers), we don't need * the logic to deal with cleaning up afterwards. * * We must call scsi_end_request(). This will finish off * the specified number of sectors. If we are done, the * command block will be released and the queue function * will be goosed. If we are not done then we have to * figure out what to do next: * * a) We can call scsi_requeue_command(). The request * will be unprepared and put back on the queue. Then * a new command will be created for it. This should * be used if we made forward progress, or if we want * to switch from READ(10) to READ(6) for example. * * b) We can call scsi_queue_insert(). The request will * be put back on the queue and retried using the same * command as before, possibly after a delay. * * c) We can call blk_end_request() with -EIO to fail * the remainder of the request. */ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) { int result = cmd->result; int this_count; struct request_queue *q = cmd->device->request_queue; struct request *req = cmd->request; int error = 0; struct scsi_sense_hdr sshdr; int sense_valid = 0; int sense_deferred = 0; enum {ACTION_FAIL, ACTION_REPREP, ACTION_RETRY, ACTION_DELAYED_RETRY} action; char *description = NULL; if (result) { sense_valid = scsi_command_normalize_sense(cmd, &sshdr); if (sense_valid) sense_deferred = scsi_sense_is_deferred(&sshdr); } if (blk_pc_request(req)) { /* SG_IO ioctl from block level */ req->errors = result; if (result) { if (sense_valid && req->sense) { /* * SG_IO wants current and deferred errors */ int len = 8 + cmd->sense_buffer[7]; if (len > SCSI_SENSE_BUFFERSIZE) len = SCSI_SENSE_BUFFERSIZE; memcpy(req->sense, cmd->sense_buffer, len); req->sense_len = len; } if (!sense_deferred) error = -EIO; } if (scsi_bidi_cmnd(cmd)) { /* will also release_buffers */ scsi_end_bidi_request(cmd); return; } req->resid_len = scsi_get_resid(cmd); } BUG_ON(blk_bidi_rq(req)); /* bidi not support for !blk_pc_request yet */ /* * Next deal with any sectors which we were able to correctly * handle. */ SCSI_LOG_HLCOMPLETE(1, printk("%u sectors total, " "%d bytes done.\n", blk_rq_sectors(req), good_bytes)); /* * Recovered errors need reporting, but they're always treated * as success, so fiddle the result code here. For BLOCK_PC * we already took a copy of the original into rq->errors which * is what gets returned to the user */ if (sense_valid && sshdr.sense_key == RECOVERED_ERROR) { if (!(req->cmd_flags & REQ_QUIET)) scsi_print_sense("", cmd); result = 0; /* BLOCK_PC may have set error */ error = 0; } /* * A number of bytes were successfully read. If there * are leftovers and there is some kind of error * (result != 0), retry the rest. */ if (scsi_end_request(cmd, error, good_bytes, result == 0) == NULL) return; this_count = blk_rq_bytes(req); error = -EIO; if (host_byte(result) == DID_RESET) { /* Third party bus reset or reset for error recovery * reasons. Just retry the command and see what * happens. */ action = ACTION_RETRY; } else if (sense_valid && !sense_deferred) { switch (sshdr.sense_key) { case UNIT_ATTENTION: if (cmd->device->removable) { /* Detected disc change. Set a bit * and quietly refuse further access. */ cmd->device->changed = 1; description = "Media Changed"; action = ACTION_FAIL; } else { /* Must have been a power glitch, or a * bus reset. Could not have been a * media change, so we just retry the * command and see what happens. */ action = ACTION_RETRY; } break; case ILLEGAL_REQUEST: /* If we had an ILLEGAL REQUEST returned, then * we may have performed an unsupported * command. The only thing this should be * would be a ten byte read where only a six * byte read was supported. Also, on a system * where READ CAPACITY failed, we may have * read past the end of the disk. */ if ((cmd->device->use_10_for_rw && sshdr.asc == 0x20 && sshdr.ascq == 0x00) && (cmd->cmnd[0] == READ_10 || cmd->cmnd[0] == WRITE_10)) { /* This will issue a new 6-byte command. */ cmd->device->use_10_for_rw = 0; action = ACTION_REPREP; } else if (sshdr.asc == 0x10) /* DIX */ { description = "Host Data Integrity Failure"; action = ACTION_FAIL; error = -EILSEQ; } else action = ACTION_FAIL; break; case ABORTED_COMMAND: action = ACTION_FAIL; if (sshdr.asc == 0x10) { /* DIF */ description = "Target Data Integrity Failure"; error = -EILSEQ; } break; case NOT_READY: /* If the device is in the process of becoming * ready, or has a temporary blockage, retry. */ if (sshdr.asc == 0x04) { switch (sshdr.ascq) { case 0x01: /* becoming ready */ case 0x04: /* format in progress */ case 0x05: /* rebuild in progress */ case 0x06: /* recalculation in progress */ case 0x07: /* operation in progress */ case 0x08: /* Long write in progress */ case 0x09: /* self test in progress */ action = ACTION_DELAYED_RETRY; break; default: description = "Device not ready"; action = ACTION_FAIL; break; } } else { description = "Device not ready"; action = ACTION_FAIL; } break; case VOLUME_OVERFLOW: /* See SSC3rXX or current. */ action = ACTION_FAIL; break; default: description = "Unhandled sense code"; action = ACTION_FAIL; break; } } else { description = "Unhandled error code"; action = ACTION_FAIL; } switch (action) { case ACTION_FAIL: /* Give up and fail the remainder of the request */ scsi_release_buffers(cmd); if (!(req->cmd_flags & REQ_QUIET)) { if (description) scmd_printk(KERN_INFO, cmd, "%s\n", description); scsi_print_result(cmd); if (driver_byte(result) & DRIVER_SENSE) scsi_print_sense("", cmd); } blk_end_request_all(req, -EIO); scsi_next_command(cmd); break; case ACTION_REPREP: /* Unprep the request and put it back at the head of the queue. * A new command will be prepared and issued. */ scsi_release_buffers(cmd); scsi_requeue_command(q, cmd); break; case ACTION_RETRY: /* Retry the same command immediately */ __scsi_queue_insert(cmd, SCSI_MLQUEUE_EH_RETRY, 0); break; case ACTION_DELAYED_RETRY: /* Retry the same command after a delay */ __scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY, 0); break; } } static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb, gfp_t gfp_mask) { int count; /* * If sg table allocation fails, requeue request later. */ if (unlikely(scsi_alloc_sgtable(sdb, req->nr_phys_segments, gfp_mask))) { return BLKPREP_DEFER; } req->buffer = NULL; /* * Next, walk the list, and fill in the addresses and sizes of * each segment. */ count = blk_rq_map_sg(req->q, req, sdb->table.sgl); BUG_ON(count > sdb->table.nents); sdb->table.nents = count; if (blk_pc_request(req)) sdb->length = blk_rq_bytes(req); else sdb->length = blk_rq_sectors(req) << 9; return BLKPREP_OK; } /* * Function: scsi_init_io() * * Purpose: SCSI I/O initialize function. * * Arguments: cmd - Command descriptor we wish to initialize * * Returns: 0 on success * BLKPREP_DEFER if the failure is retryable * BLKPREP_KILL if the failure is fatal */ int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask) { int error = scsi_init_sgtable(cmd->request, &cmd->sdb, gfp_mask); if (error) goto err_exit; if (blk_bidi_rq(cmd->request)) { struct scsi_data_buffer *bidi_sdb = kmem_cache_zalloc( scsi_sdb_cache, GFP_ATOMIC); if (!bidi_sdb) { error = BLKPREP_DEFER; goto err_exit; } cmd->request->next_rq->special = bidi_sdb; error = scsi_init_sgtable(cmd->request->next_rq, bidi_sdb, GFP_ATOMIC); if (error) goto err_exit; } if (blk_integrity_rq(cmd->request)) { struct scsi_data_buffer *prot_sdb = cmd->prot_sdb; int ivecs, count; BUG_ON(prot_sdb == NULL); ivecs = blk_rq_count_integrity_sg(cmd->request); if (scsi_alloc_sgtable(prot_sdb, ivecs, gfp_mask)) { error = BLKPREP_DEFER; goto err_exit; } count = blk_rq_map_integrity_sg(cmd->request, prot_sdb->table.sgl); BUG_ON(unlikely(count > ivecs)); cmd->prot_sdb = prot_sdb; cmd->prot_sdb->table.nents = count; } return BLKPREP_OK ; err_exit: scsi_release_buffers(cmd); if (error == BLKPREP_KILL) scsi_put_command(cmd); else /* BLKPREP_DEFER */ scsi_unprep_request(cmd->request); return error; } EXPORT_SYMBOL(scsi_init_io); static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev, struct request *req) { struct scsi_cmnd *cmd; if (!req->special) { cmd = scsi_get_command(sdev, GFP_ATOMIC); if (unlikely(!cmd)) return NULL; req->special = cmd; } else { cmd = req->special; } /* pull a tag out of the request if we have one */ cmd->tag = req->tag; cmd->request = req; cmd->cmnd = req->cmd; return cmd; } int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req) { struct scsi_cmnd *cmd; int ret = scsi_prep_state_check(sdev, req); if (ret != BLKPREP_OK) return ret; cmd = scsi_get_cmd_from_req(sdev, req); if (unlikely(!cmd)) return BLKPREP_DEFER; /* * BLOCK_PC requests may transfer data, in which case they must * a bio attached to them. Or they might contain a SCSI command * that does not transfer data, in which case they may optionally * submit a request without an attached bio. */ if (req->bio) { int ret; BUG_ON(!req->nr_phys_segments); ret = scsi_init_io(cmd, GFP_ATOMIC); if (unlikely(ret)) return ret; } else { BUG_ON(blk_rq_bytes(req)); memset(&cmd->sdb, 0, sizeof(cmd->sdb)); req->buffer = NULL; } cmd->cmd_len = req->cmd_len; if (!blk_rq_bytes(req)) cmd->sc_data_direction = DMA_NONE; else if (rq_data_dir(req) == WRITE) cmd->sc_data_direction = DMA_TO_DEVICE; else cmd->sc_data_direction = DMA_FROM_DEVICE; cmd->transfersize = blk_rq_bytes(req); cmd->allowed = req->retries; return BLKPREP_OK; } EXPORT_SYMBOL(scsi_setup_blk_pc_cmnd); /* * Setup a REQ_TYPE_FS command. These are simple read/write request * from filesystems that still need to be translated to SCSI CDBs from * the ULD. */ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req) { struct scsi_cmnd *cmd; int ret = scsi_prep_state_check(sdev, req); if (ret != BLKPREP_OK) return ret; if (unlikely(sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && sdev->scsi_dh_data->scsi_dh->prep_fn)) { ret = sdev->scsi_dh_data->scsi_dh->prep_fn(sdev, req); if (ret != BLKPREP_OK) return ret; } /* * Filesystem requests must transfer data. */ BUG_ON(!req->nr_phys_segments); cmd = scsi_get_cmd_from_req(sdev, req); if (unlikely(!cmd)) return BLKPREP_DEFER; memset(cmd->cmnd, 0, BLK_MAX_CDB); return scsi_init_io(cmd, GFP_ATOMIC); } EXPORT_SYMBOL(scsi_setup_fs_cmnd); int scsi_prep_state_check(struct scsi_device *sdev, struct request *req) { int ret = BLKPREP_OK; /* * If the device is not in running state we will reject some * or all commands. */ if (unlikely(sdev->sdev_state != SDEV_RUNNING)) { switch (sdev->sdev_state) { case SDEV_OFFLINE: /* * If the device is offline we refuse to process any * commands. The device must be brought online * before trying any recovery commands. */ sdev_printk(KERN_ERR, sdev, "rejecting I/O to offline device\n"); ret = BLKPREP_KILL; break; case SDEV_DEL: /* * If the device is fully deleted, we refuse to * process any commands as well. */ sdev_printk(KERN_ERR, sdev, "rejecting I/O to dead device\n"); ret = BLKPREP_KILL; break; case SDEV_QUIESCE: case SDEV_BLOCK: case SDEV_CREATED_BLOCK: /* * If the devices is blocked we defer normal commands. */ if (!(req->cmd_flags & REQ_PREEMPT)) ret = BLKPREP_DEFER; break; default: /* * For any other not fully online state we only allow * special commands. In particular any user initiated * command is not allowed. */ if (!(req->cmd_flags & REQ_PREEMPT)) ret = BLKPREP_KILL; break; } } return ret; } EXPORT_SYMBOL(scsi_prep_state_check); int scsi_prep_return(struct request_queue *q, struct request *req, int ret) { struct scsi_device *sdev = q->queuedata; switch (ret) { case BLKPREP_KILL: req->errors = DID_NO_CONNECT << 16; /* release the command and kill it */ if (req->special) { struct scsi_cmnd *cmd = req->special; scsi_release_buffers(cmd); scsi_put_command(cmd); req->special = NULL; } break; case BLKPREP_DEFER: /* * If we defer, the elv_next_request() returns NULL, but the * queue must be restarted, so we plug here if no returning * command will automatically do that. */ if (sdev->device_busy == 0) blk_plug_device(q); break; default: req->cmd_flags |= REQ_DONTPREP; } return ret; } EXPORT_SYMBOL(scsi_prep_return); int scsi_prep_fn(struct request_queue *q, struct request *req) { struct scsi_device *sdev = q->queuedata; int ret = BLKPREP_KILL; if (req->cmd_type == REQ_TYPE_BLOCK_PC) ret = scsi_setup_blk_pc_cmnd(sdev, req); return scsi_prep_return(q, req, ret); } /* * scsi_dev_queue_ready: if we can send requests to sdev, return 1 else * return 0. * * Called with the queue_lock held. */ static inline int scsi_dev_queue_ready(struct request_queue *q, struct scsi_device *sdev) { if (sdev->device_busy == 0 && sdev->device_blocked) { /* * unblock after device_blocked iterates to zero */ if (--sdev->device_blocked == 0) { SCSI_LOG_MLQUEUE(3, sdev_printk(KERN_INFO, sdev, "unblocking device at zero depth\n")); } else { blk_plug_device(q); return 0; } } if (scsi_device_is_busy(sdev)) return 0; return 1; } /* * scsi_target_queue_ready: checks if there we can send commands to target * @sdev: scsi device on starget to check. * * Called with the host lock held. */ static inline int scsi_target_queue_ready(struct Scsi_Host *shost, struct scsi_device *sdev) { struct scsi_target *starget = scsi_target(sdev); if (starget->single_lun) { if (starget->starget_sdev_user && starget->starget_sdev_user != sdev) return 0; starget->starget_sdev_user = sdev; } if (starget->target_busy == 0 && starget->target_blocked) { /* * unblock after target_blocked iterates to zero */ if (--starget->target_blocked == 0) { SCSI_LOG_MLQUEUE(3, starget_printk(KERN_INFO, starget, "unblocking target at zero depth\n")); } else { blk_plug_device(sdev->request_queue); return 0; } } if (scsi_target_is_busy(starget)) { if (list_empty(&sdev->starved_entry)) { list_add_tail(&sdev->starved_entry, &shost->starved_list); return 0; } } /* We're OK to process the command, so we can't be starved */ if (!list_empty(&sdev->starved_entry)) list_del_init(&sdev->starved_entry); return 1; } /* * scsi_host_queue_ready: if we can send requests to shost, return 1 else * return 0. We must end up running the queue again whenever 0 is * returned, else IO can hang. * * Called with host_lock held. */ static inline int scsi_host_queue_ready(struct request_queue *q, struct Scsi_Host *shost, struct scsi_device *sdev) { if (scsi_host_in_recovery(shost)) return 0; if (shost->host_busy == 0 && shost->host_blocked) { /* * unblock after host_blocked iterates to zero */ if (--shost->host_blocked == 0) { SCSI_LOG_MLQUEUE(3, printk("scsi%d unblocking host at zero depth\n", shost->host_no)); } else { return 0; } } if (scsi_host_is_busy(shost)) { if (list_empty(&sdev->starved_entry)) list_add_tail(&sdev->starved_entry, &shost->starved_list); return 0; } /* We're OK to process the command, so we can't be starved */ if (!list_empty(&sdev->starved_entry)) list_del_init(&sdev->starved_entry); return 1; } /* * Busy state exporting function for request stacking drivers. * * For efficiency, no lock is taken to check the busy state of * shost/starget/sdev, since the returned value is not guaranteed and * may be changed after request stacking drivers call the function, * regardless of taking lock or not. * * When scsi can't dispatch I/Os anymore and needs to kill I/Os * (e.g. !sdev), scsi needs to return 'not busy'. * Otherwise, request stacking drivers may hold requests forever. */ static int scsi_lld_busy(struct request_queue *q) { struct scsi_device *sdev = q->queuedata; struct Scsi_Host *shost; struct scsi_target *starget; if (!sdev) return 0; shost = sdev->host; starget = scsi_target(sdev); if (scsi_host_in_recovery(shost) || scsi_host_is_busy(shost) || scsi_target_is_busy(starget) || scsi_device_is_busy(sdev)) return 1; return 0; } /* * Kill a request for a dead device */ static void scsi_kill_request(struct request *req, struct request_queue *q) { struct scsi_cmnd *cmd = req->special; struct scsi_device *sdev = cmd->device; struct scsi_target *starget = scsi_target(sdev); struct Scsi_Host *shost = sdev->host; blkdev_dequeue_request(req); if (unlikely(cmd == NULL)) { printk(KERN_CRIT "impossible request in %s.\n", __func__); BUG(); } scsi_init_cmd_errh(cmd); cmd->result = DID_NO_CONNECT << 16; atomic_inc(&cmd->device->iorequest_cnt); /* * SCSI request completion path will do scsi_device_unbusy(), * bump busy counts. To bump the counters, we need to dance * with the locks as normal issue path does. */ sdev->device_busy++; spin_unlock(sdev->request_queue->queue_lock); spin_lock(shost->host_lock); shost->host_busy++; starget->target_busy++; spin_unlock(shost->host_lock); spin_lock(sdev->request_queue->queue_lock); blk_complete_request(req); } static void scsi_softirq_done(struct request *rq) { struct scsi_cmnd *cmd = rq->special; unsigned long wait_for = (cmd->allowed + 1) * rq->timeout; int disposition; INIT_LIST_HEAD(&cmd->eh_entry); /* * Set the serial numbers back to zero */ cmd->serial_number = 0; atomic_inc(&cmd->device->iodone_cnt); if (cmd->result) atomic_inc(&cmd->device->ioerr_cnt); disposition = scsi_decide_disposition(cmd); if (disposition != SUCCESS && time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) { sdev_printk(KERN_ERR, cmd->device, "timing out command, waited %lus\n", wait_for/HZ); disposition = SUCCESS; } scsi_log_completion(cmd, disposition); switch (disposition) { case SUCCESS: scsi_finish_command(cmd); break; case NEEDS_RETRY: scsi_queue_insert(cmd, SCSI_MLQUEUE_EH_RETRY); break; case ADD_TO_MLQUEUE: scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY); break; default: if (!scsi_eh_scmd_add(cmd, 0)) scsi_finish_command(cmd); } } /* * Function: scsi_request_fn() * * Purpose: Main strategy routine for SCSI. * * Arguments: q - Pointer to actual queue. * * Returns: Nothing * * Lock status: IO request lock assumed to be held when called. */ static void scsi_request_fn(struct request_queue *q) { struct scsi_device *sdev = q->queuedata; struct Scsi_Host *shost; struct scsi_cmnd *cmd; struct request *req; if (!sdev) { printk("scsi: killing requests for dead queue\n"); while ((req = elv_next_request(q)) != NULL) scsi_kill_request(req, q); return; } if(!get_device(&sdev->sdev_gendev)) /* We must be tearing the block queue down already */ return; /* * To start with, we keep looping until the queue is empty, or until * the host is no longer able to accept any more requests. */ shost = sdev->host; while (!blk_queue_plugged(q)) { int rtn; /* * get next queueable request. We do this early to make sure * that the request is fully prepared even if we cannot * accept it. */ req = elv_next_request(q); if (!req || !scsi_dev_queue_ready(q, sdev)) break; if (unlikely(!scsi_device_online(sdev))) { sdev_printk(KERN_ERR, sdev, "rejecting I/O to offline device\n"); scsi_kill_request(req, q); continue; } /* * Remove the request from the request list. */ if (!(blk_queue_tagged(q) && !blk_queue_start_tag(q, req))) blkdev_dequeue_request(req); 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\n", __func__); blk_dump_rq_flags(req, "foo"); BUG(); } spin_lock(shost->host_lock); /* * We hit this when the driver is using a host wide * tag map. For device level tag maps the queue_depth check * in the device ready fn would prevent us from trying * to allocate a tag. Since the map is a shared host resource * we add the dev to the starved list so it eventually gets * a run when a tag is freed. */ if (blk_queue_tagged(q) && !blk_rq_tagged(req)) { if (list_empty(&sdev->starved_entry)) list_add_tail(&sdev->starved_entry, &shost->starved_list); goto not_ready; } if (!scsi_target_queue_ready(shost, sdev)) goto not_ready; if (!scsi_host_queue_ready(q, shost, sdev)) goto not_ready; scsi_target(sdev)->target_busy++; shost->host_busy++; /* * XXX(hch): This is rather suboptimal, scsi_dispatch_cmd will * take the lock again. */ spin_unlock_irq(shost->host_lock); /* * Finally, initialize any error handling parameters, and set up * the timers for timeouts. */ scsi_init_cmd_errh(cmd); /* * Dispatch the command to the low-level driver. */ rtn = scsi_dispatch_cmd(cmd); spin_lock_irq(q->queue_lock); if(rtn) { /* we're refusing the command; because of * the way locks get dropped, we need to * check here if plugging is required */ if(sdev->device_busy == 0) blk_plug_device(q); break; } } goto out; not_ready: spin_unlock_irq(shost->host_lock); /* * lock q, handle tag, requeue req, and decrement device_busy. We * must return with queue_lock held. * * Decrementing device_busy without checking it is OK, as all such * cases (host limits or settings) should run the queue at some * later time. */ spin_lock_irq(q->queue_lock); blk_requeue_request(q, req); sdev->device_busy--; if(sdev->device_busy == 0) blk_plug_device(q); out: /* must be careful here...if we trigger the ->remove() function * we cannot be holding the q lock */ spin_unlock_irq(q->queue_lock); put_device(&sdev->sdev_gendev); spin_lock_irq(q->queue_lock); } u64 scsi_calculate_bounce_limit(struct Scsi_Host *shost) { struct device *host_dev; u64 bounce_limit = 0xffffffff; if (shost->unchecked_isa_dma) return BLK_BOUNCE_ISA; /* * Platforms with virtual-DMA translation * hardware have no practical limit. */ if (!PCI_DMA_BUS_IS_PHYS) return BLK_BOUNCE_ANY; host_dev = scsi_get_device(shost); if (host_dev && host_dev->dma_mask) bounce_limit = *host_dev->dma_mask; return bounce_limit; } EXPORT_SYMBOL(scsi_calculate_bounce_limit); struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost, request_fn_proc *request_fn) { struct request_queue *q; struct device *dev = shost->shost_gendev.parent; q = blk_init_queue(request_fn, NULL); if (!q) return NULL; /* * this limit is imposed by hardware restrictions */ blk_queue_max_hw_segments(q, shost->sg_tablesize); blk_queue_max_phys_segments(q, SCSI_MAX_SG_CHAIN_SEGMENTS); blk_queue_max_sectors(q, shost->max_sectors); blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost)); blk_queue_segment_boundary(q, shost->dma_boundary); dma_set_seg_boundary(dev, shost->dma_boundary); blk_queue_max_segment_size(q, dma_get_max_seg_size(dev)); /* New queue, no concurrency on queue_flags */ if (!shost->use_clustering) queue_flag_clear_unlocked(QUEUE_FLAG_CLUSTER, q); /* * set a reasonable default alignment on word boundaries: the * host and device may alter it using * blk_queue_update_dma_alignment() later. */ blk_queue_dma_alignment(q, 0x03); return q; } EXPORT_SYMBOL(__scsi_alloc_queue); struct request_queue *scsi_alloc_queue(struct scsi_device *sdev) { struct request_queue *q; q = __scsi_alloc_queue(sdev->host, scsi_request_fn); if (!q) return NULL; blk_queue_prep_rq(q, scsi_prep_fn); blk_queue_softirq_done(q, scsi_softirq_done); blk_queue_rq_timed_out(q, scsi_times_out); blk_queue_lld_busy(q, scsi_lld_busy); return q; } void scsi_free_queue(struct request_queue *q) { blk_cleanup_queue(q); } /* * Function: scsi_block_requests() * * Purpose: Utility function used by low-level drivers to prevent further * commands from being queued to the device. * * Arguments: shost - Host in question * * Returns: Nothing * * Lock status: No locks are assumed held. * * Notes: There is no timer nor any other means by which the requests * get unblocked other than the low-level driver calling * scsi_unblock_requests(). */ void scsi_block_requests(struct Scsi_Host *shost) { shost->host_self_blocked = 1; } EXPORT_SYMBOL(scsi_block_requests); /* * Function: scsi_unblock_requests() * * Purpose: Utility function used by low-level drivers to allow further * commands from being queued to the device. * * Arguments: shost - Host in question * * Returns: Nothing * * Lock status: No locks are assumed held. * * Notes: There is no timer nor any other means by which the requests * get unblocked other than the low-level driver calling * scsi_unblock_requests(). * * This is done as an API function so that changes to the * internals of the scsi mid-layer won't require wholesale * changes to drivers that use this feature. */ void scsi_unblock_requests(struct Scsi_Host *shost) { shost->host_self_blocked = 0; scsi_run_host_queues(shost); } EXPORT_SYMBOL(scsi_unblock_requests); int __init scsi_init_queue(void) { int i; scsi_sdb_cache = kmem_cache_create("scsi_data_buffer", sizeof(struct scsi_data_buffer), 0, 0, NULL); if (!scsi_sdb_cache) { printk(KERN_ERR "SCSI: can't init scsi sdb cache\n"); return -ENOMEM; } for (i = 0; i < SG_MEMPOOL_NR; i++) { struct scsi_host_sg_pool *sgp = scsi_sg_pools + i; int size = sgp->size * sizeof(struct scatterlist); sgp->slab = kmem_cache_create(sgp->name, size, 0, SLAB_HWCACHE_ALIGN, NULL); if (!sgp->slab) { printk(KERN_ERR "SCSI: can't init sg slab %s\n", sgp->name); goto cleanup_sdb; } sgp->pool = mempool_create_slab_pool(SG_MEMPOOL_SIZE, sgp->slab); if (!sgp->pool) { printk(KERN_ERR "SCSI: can't init sg mempool %s\n", sgp->name); goto cleanup_sdb; } } return 0; cleanup_sdb: for (i = 0; i < SG_MEMPOOL_NR; i++) { struct scsi_host_sg_pool *sgp = scsi_sg_pools + i; if (sgp->pool) mempool_destroy(sgp->pool); if (sgp->slab) kmem_cache_destroy(sgp->slab); } kmem_cache_destroy(scsi_sdb_cache); return -ENOMEM; } void scsi_exit_queue(void) { int i; kmem_cache_destroy(scsi_sdb_cache); for (i = 0; i < SG_MEMPOOL_NR; i++) { struct scsi_host_sg_pool *sgp = scsi_sg_pools + i; mempool_destroy(sgp->pool); kmem_cache_destroy(sgp->slab); } } /** * scsi_mode_select - issue a mode select * @sdev: SCSI device to be queried * @pf: Page format bit (1 == standard, 0 == vendor specific) * @sp: Save page bit (0 == don't save, 1 == save) * @modepage: mode page being requested * @buffer: request buffer (may not be smaller than eight bytes) * @len: length of request buffer. * @timeout: command timeout * @retries: number of retries before failing * @data: returns a structure abstracting the mode header data * @sshdr: place to put sense data (or NULL if no sense to be collected). * must be SCSI_SENSE_BUFFERSIZE big. * * Returns zero if successful; negative error number or scsi * status on error * */ int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, int modepage, unsigned char *buffer, int len, int timeout, int retries, struct scsi_mode_data *data, struct scsi_sense_hdr *sshdr) { unsigned char cmd[10]; unsigned char *real_buffer; int ret; memset(cmd, 0, sizeof(cmd)); cmd[1] = (pf ? 0x10 : 0) | (sp ? 0x01 : 0); if (sdev->use_10_for_ms) { if (len > 65535) return -EINVAL; real_buffer = kmalloc(8 + len, GFP_KERNEL); if (!real_buffer) return -ENOMEM; memcpy(real_buffer + 8, buffer, len); len += 8; real_buffer[0] = 0; real_buffer[1] = 0; real_buffer[2] = data->medium_type; real_buffer[3] = data->device_specific; real_buffer[4] = data->longlba ? 0x01 : 0; real_buffer[5] = 0; real_buffer[6] = data->block_descriptor_length >> 8; real_buffer[7] = data->block_descriptor_length; cmd[0] = MODE_SELECT_10; cmd[7] = len >> 8; cmd[8] = len; } else { if (len > 255 || data->block_descriptor_length > 255 || data->longlba) return -EINVAL; real_buffer = kmalloc(4 + len, GFP_KERNEL); if (!real_buffer) return -ENOMEM; memcpy(real_buffer + 4, buffer, len); len += 4; real_buffer[0] = 0; real_buffer[1] = data->medium_type; real_buffer[2] = data->device_specific; real_buffer[3] = data->block_descriptor_length; cmd[0] = MODE_SELECT; cmd[4] = len; } ret = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, real_buffer, len, sshdr, timeout, retries, NULL); kfree(real_buffer); return ret; } EXPORT_SYMBOL_GPL(scsi_mode_select); /** * scsi_mode_sense - issue a mode sense, falling back from 10 to six bytes if necessary. * @sdev: SCSI device to be queried * @dbd: set if mode sense will allow block descriptors to be returned * @modepage: mode page being requested * @buffer: request buffer (may not be smaller than eight bytes) * @len: length of request buffer. * @timeout: command timeout * @retries: number of retries before failing * @data: returns a structure abstracting the mode header data * @sshdr: place to put sense data (or NULL if no sense to be collected). * must be SCSI_SENSE_BUFFERSIZE big. * * Returns zero if unsuccessful, or the header offset (either 4 * or 8 depending on whether a six or ten byte command was * issued) if successful. */ int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, unsigned char *buffer, int len, int timeout, int retries, struct scsi_mode_data *data, struct scsi_sense_hdr *sshdr) { unsigned char cmd[12]; int use_10_for_ms; int header_length; int result; struct scsi_sense_hdr my_sshdr; memset(data, 0, sizeof(*data)); memset(&cmd[0], 0, 12); cmd[1] = dbd & 0x18; /* allows DBD and LLBA bits */ cmd[2] = modepage; /* caller might not be interested in sense, but we need it */ if (!sshdr) sshdr = &my_sshdr; retry: use_10_for_ms = sdev->use_10_for_ms; if (use_10_for_ms) { if (len < 8) len = 8; cmd[0] = MODE_SENSE_10; cmd[8] = len; header_length = 8; } else { if (len < 4) len = 4; cmd[0] = MODE_SENSE; cmd[4] = len; header_length = 4; } memset(buffer, 0, len); result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, len, sshdr, timeout, retries, NULL); /* This code looks awful: what it's doing is making sure an * ILLEGAL REQUEST sense return identifies the actual command * byte as the problem. MODE_SENSE commands can return * ILLEGAL REQUEST if the code page isn't supported */ if (use_10_for_ms && !scsi_status_is_good(result) && (driver_byte(result) & DRIVER_SENSE)) { if (scsi_sense_valid(sshdr)) { if ((sshdr->sense_key == ILLEGAL_REQUEST) && (sshdr->asc == 0x20) && (sshdr->ascq == 0)) { /* * Invalid command operation code */ sdev->use_10_for_ms = 0; goto retry; } } } if(scsi_status_is_good(result)) { if (unlikely(buffer[0] == 0x86 && buffer[1] == 0x0b && (modepage == 6 || modepage == 8))) { /* Initio breakage? */ header_length = 0; data->length = 13; data->medium_type = 0; data->device_specific = 0; data->longlba = 0; data->block_descriptor_length = 0; } else if(use_10_for_ms) { data->length = buffer[0]*256 + buffer[1] + 2; data->medium_type = buffer[2];