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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 Kim8 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 2025-09-16 13:01:25 -0400
if ((x)==(y)) udelay(5); } #define REMOVE(w,x,y,z) \ { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \ (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \ if ((x)==(y)) udelay(5); } #else #define LIST(x,y) #define REMOVE(w,x,y,z) #endif #ifndef notyet #undef LINKED #endif /* * Design * Issues : * * The other Linux SCSI drivers were written when Linux was Intel PC-only, * and specifically for each board rather than each chip. This makes their * adaptation to platforms like the Mac (Some of which use NCR5380's) * more difficult than it has to be. * * Also, many of the SCSI drivers were written before the command queuing * routines were implemented, meaning their implementations of queued * commands were hacked on rather than designed in from the start. * * When I designed the Linux SCSI drivers I figured that * while having two different SCSI boards in a system might be useful * for debugging things, two of the same type wouldn't be used. * Well, I was wrong and a number of users have mailed me about running * multiple high-performance SCSI boards in a server. * * Finally, when I get questions from users, I have no idea what * revision of my driver they are running. * * This driver attempts to address these problems : * This is a generic 5380 driver. To use it on a different platform, * one simply writes appropriate system specific macros (ie, data * transfer - some PC's will use the I/O bus, 68K's must use * memory mapped) and drops this file in their 'C' wrapper. * * As far as command queueing, two queues are maintained for * each 5380 in the system - commands that haven't been issued yet, * and commands that are currently executing. This means that an * unlimited number of commands may be queued, letting * more commands propagate from the higher driver levels giving higher * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, * allowing multiple commands to propagate all the way to a SCSI-II device * while a command is already executing. * * To solve the multiple-boards-in-the-same-system problem, * there is a separate instance structure for each instance * of a 5380 in the system. So, multiple NCR5380 drivers will * be able to coexist with appropriate changes to the high level * SCSI code. * * A NCR5380_PUBLIC_REVISION macro is provided, with the release * number (updated for each public release) printed by the * NCR5380_print_options command, which should be called from the * wrapper detect function, so that I know what release of the driver * users are using. * * Issues specific to the NCR5380 : * * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead * piece of hardware that requires you to sit in a loop polling for * the REQ signal as long as you are connected. Some devices are * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect * while doing long seek operations. * * The workaround for this is to keep track of devices that have * disconnected. If the device hasn't disconnected, for commands that * should disconnect, we do something like * * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } * * Some tweaking of N and M needs to be done. An algorithm based * on "time to data" would give the best results as long as short time * to datas (ie, on the same track) were considered, however these * broken devices are the exception rather than the rule and I'd rather * spend my time optimizing for the normal case. * * Architecture : * * At the heart of the design is a coroutine, NCR5380_main, * which is started when not running by the interrupt handler, * timer, and queue command function. It attempts to establish * I_T_L or I_T_L_Q nexuses by removing the commands from the * issue queue and calling NCR5380_select() if a nexus * is not established. * * Once a nexus is established, the NCR5380_information_transfer() * phase goes through the various phases as instructed by the target. * if the target goes into MSG IN and sends a DISCONNECT message, * the command structure is placed into the per instance disconnected * queue, and NCR5380_main tries to find more work. If USLEEP * was defined, and the target is idle for too long, the system * will try to sleep. * * If a command has disconnected, eventually an interrupt will trigger, * calling NCR5380_intr() which will in turn call NCR5380_reselect * to reestablish a nexus. This will run main if necessary. * * On command termination, the done function will be called as * appropriate. * * SCSI pointers are maintained in the SCp field of SCSI command * structures, being initialized after the command is connected * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. * Note that in violation of the standard, an implicit SAVE POINTERS operation * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. */ /* * Using this file : * This file a skeleton Linux SCSI driver for the NCR 5380 series * of chips. To use it, you write an architecture specific functions * and macros and include this file in your driver. * * These macros control options : * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically * for commands that return with a CHECK CONDITION status. * * LINKED - if defined, linked commands are supported. * * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. * * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible * * These macros MUST be defined : * * NCR5380_read(register) - read from the specified register * * NCR5380_write(register, value) - write to the specific register * * Either real DMA *or* pseudo DMA may be implemented * REAL functions : * NCR5380_REAL_DMA should be defined if real DMA is to be used. * Note that the DMA setup functions should return the number of bytes * that they were able to program the controller for. * * Also note that generic i386/PC versions of these macros are * available as NCR5380_i386_dma_write_setup, * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. * * NCR5380_dma_write_setup(instance, src, count) - initialize * NCR5380_dma_read_setup(instance, dst, count) - initialize * NCR5380_dma_residual(instance); - residual count * * PSEUDO functions : * NCR5380_pwrite(instance, src, count) * NCR5380_pread(instance, dst, count); * * If nothing specific to this implementation needs doing (ie, with external * hardware), you must also define * * NCR5380_queue_command * NCR5380_reset * NCR5380_abort * NCR5380_proc_info * * to be the global entry points into the specific driver, ie * #define NCR5380_queue_command t128_queue_command. * * If this is not done, the routines will be defined as static functions * with the NCR5380* names and the user must provide a globally * accessible wrapper function. * * The generic driver is initialized by calling NCR5380_init(instance), * after setting the appropriate host specific fields and ID. If the * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, * possible) function may be used. Before the specific driver initialization * code finishes, NCR5380_print_options should be called. */ static struct Scsi_Host *first_instance = NULL; static struct scsi_host_template *the_template = NULL; /* Macros ease life... :-) */ #define SETUP_HOSTDATA(in) \ struct NCR5380_hostdata *hostdata = \ (struct NCR5380_hostdata *)(in)->hostdata #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) #define NEXT(cmd) ((Scsi_Cmnd *)((cmd)->host_scribble)) #define NEXTADDR(cmd) ((Scsi_Cmnd **)&((cmd)->host_scribble)) #define HOSTNO instance->host_no #define H_NO(cmd) (cmd)->device->host->host_no #define SGADDR(buffer) (void *)(((unsigned long)page_address((buffer)->page)) + \ (buffer)->offset) #ifdef SUPPORT_TAGS /* * Functions for handling tagged queuing * ===================================== * * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: * * Using consecutive numbers for the tags is no good idea in my eyes. There * could be wrong re-usings if the counter (8 bit!) wraps and some early * command has been preempted for a long time. My solution: a bitfield for * remembering used tags. * * There's also the problem that each target has a certain queue size, but we * cannot know it in advance :-( We just see a QUEUE_FULL status being * returned. So, in this case, the driver internal queue size assumption is * reduced to the number of active tags if QUEUE_FULL is returned by the * target. The command is returned to the mid-level, but with status changed * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL * correctly. * * We're also not allowed running tagged commands as long as an untagged * command is active. And REQUEST SENSE commands after a contingent allegiance * condition _must_ be untagged. To keep track whether an untagged command has * been issued, the host->busy array is still employed, as it is without * support for tagged queuing. * * One could suspect that there are possible race conditions between * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), * which already guaranteed to be running at most once. It is also the only * place where tags/LUNs are allocated. So no other allocation can slip * between that pair, there could only happen a reselection, which can free a * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes * important: the tag bit must be cleared before 'nr_allocated' is decreased. */ /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */ #undef TAG_NONE #define TAG_NONE 0xff /* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */ #if (MAX_TAGS % 32) != 0 #error "MAX_TAGS must be a multiple of 32!" #endif typedef struct { char allocated[MAX_TAGS/8]; int nr_allocated; int queue_size; } TAG_ALLOC; static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */ static void __init init_tags( void ) { int target, lun; TAG_ALLOC *ta; if (!setup_use_tagged_queuing) return; for( target = 0; target < 8; ++target ) { for( lun = 0; lun < 8; ++lun ) { ta = &TagAlloc[target][lun]; memset( &ta->allocated, 0, MAX_TAGS/8 ); ta->nr_allocated = 0; /* At the beginning, assume the maximum queue size we could * support (MAX_TAGS). This value will be decreased if the target * returns QUEUE_FULL status. */ ta->queue_size = MAX_TAGS; } } } /* Check if we can issue a command to this LUN: First see if the LUN is marked * busy by an untagged command. If the command should use tagged queuing, also * check that there is a free tag and the target's queue won't overflow. This * function should be called with interrupts disabled to avoid race * conditions. */ static int is_lun_busy( Scsi_Cmnd *cmd, int should_be_tagged ) { SETUP_HOSTDATA(cmd->device->host); if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)) return( 1 ); if (!should_be_tagged || !setup_use_tagged_queuing || !cmd->device->tagged_supported) return( 0 ); if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >= TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) { TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n", H_NO(cmd), cmd->device->id, cmd->device->lun ); return( 1 ); } return( 0 ); } /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() * must be called before!), or reserve the LUN in 'busy' if the command is * untagged. */ static void cmd_get_tag( Scsi_Cmnd *cmd, int should_be_tagged ) { SETUP_HOSTDATA(cmd->device->host); /* If we or the target don't support tagged queuing, allocate the LUN for * an untagged command. */ if (!should_be_tagged || !setup_use_tagged_queuing || !cmd->device->tagged_supported) { cmd->tag = TAG_NONE; hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged " "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun ); } else { TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS ); set_bit( cmd->tag, &ta->allocated ); ta->nr_allocated++; TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d " "(now %d tags in use)\n", H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun, ta->nr_allocated ); } } /* Mark the tag of command 'cmd' as free, or in case of an untagged command, * unlock the LUN. */ static void cmd_free_tag( Scsi_Cmnd *cmd ) { SETUP_HOSTDATA(cmd->device->host); if (cmd->tag == TAG_NONE) { hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n", H_NO(cmd), cmd->device->id, cmd->device->lun ); } else if (cmd->tag >= MAX_TAGS) { printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", H_NO(cmd), cmd->tag ); } else { TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; clear_bit( cmd->tag, &ta->allocated ); ta->nr_allocated--; TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n", H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun ); } } static void free_all_tags( void ) { int target, lun; TAG_ALLOC *ta; if (!setup_use_tagged_queuing) return; for( target = 0; target < 8; ++target ) { for( lun = 0; lun < 8; ++lun ) { ta = &TagAlloc[target][lun]; memset( &ta->allocated, 0, MAX_TAGS/8 ); ta->nr_allocated = 0; } } } #endif /* SUPPORT_TAGS */ /* * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd ) * * Purpose: Try to merge several scatter-gather requests into one DMA * transfer. This is possible if the scatter buffers lie on * physical contiguous addresses. * * Parameters: Scsi_Cmnd *cmd * The command to work on. The first scatter buffer's data are * assumed to be already transfered into ptr/this_residual. */ static void merge_contiguous_buffers( Scsi_Cmnd *cmd ) { unsigned long endaddr; #if (NDEBUG & NDEBUG_MERGING) unsigned long oldlen = cmd->SCp.this_residual; int cnt = 1; #endif for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; cmd->SCp.buffers_residual && virt_to_phys(SGADDR(&(cmd->SCp.buffer[1]))) == endaddr; ) { MER_PRINTK("VTOP(%p) == %08lx -> merging\n", SGADDR(&(cmd->SCp.buffer[1])), endaddr); #if (NDEBUG & NDEBUG_MERGING) ++cnt; #endif ++cmd->SCp.buffer; --cmd->SCp.buffers_residual; cmd->SCp.this_residual += cmd->SCp.buffer->length; endaddr += cmd->SCp.buffer->length; } #if (NDEBUG & NDEBUG_MERGING) if (oldlen != cmd->SCp.this_residual) MER_PRINTK("merged %d buffers from %p, new length %08x\n", cnt, cmd->SCp.ptr, cmd->SCp.this_residual); #endif } /* * Function : void initialize_SCp(Scsi_Cmnd *cmd) * * Purpose : initialize the saved data pointers for cmd to point to the * start of the buffer. * * Inputs : cmd - Scsi_Cmnd structure to have pointers reset. */ static __inline__ void initialize_SCp(Scsi_Cmnd *cmd) { /* * Initialize the Scsi Pointer field so that all of the commands in the * various queues are valid. */ if (cmd->use_sg) { cmd->SCp.buffer = (struct scatterlist *) cmd->buffer; cmd->SCp.buffers_residual = cmd->use_sg - 1; cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer); cmd->SCp.this_residual = cmd->SCp.buffer->length; /* ++roman: Try to merge some scatter-buffers if they are at * contiguous physical addresses. */ // merge_contiguous_buffers( cmd ); } else { cmd->SCp.buffer = NULL; cmd->SCp.buffers_residual = 0; cmd->SCp.ptr = (char *) cmd->request_buffer; cmd->SCp.this_residual = cmd->request_bufflen; } } #include <linux/config.h> #include <linux/delay.h> #if 1 static struct { unsigned char mask; const char * name;} signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, { SR_SEL, "SEL" }, {0, NULL}}, basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}}, icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, {0, NULL}}, mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, {MR_MONITOR_BSY, "MODE MONITOR BSY"}, {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, {0, NULL}}; /* * Function : void NCR5380_print(struct Scsi_Host *instance) * * Purpose : print the SCSI bus signals for debugging purposes * * Input : instance - which NCR5380 */ static void NCR5380_print(struct Scsi_Host *instance) { unsigned char status, data, basr, mr, icr, i; unsigned long flags; local_irq_save(flags); data = NCR5380_read(CURRENT_SCSI_DATA_REG); status = NCR5380_read(STATUS_REG); mr = NCR5380_read(MODE_REG); icr = NCR5380_read(INITIATOR_COMMAND_REG); basr = NCR5380_read(BUS_AND_STATUS_REG); local_irq_restore(flags); printk("STATUS_REG: %02x ", status); for (i = 0; signals[i].mask ; ++i) if (status & signals[i].mask) printk(",%s", signals[i].name); printk("\nBASR: %02x ", basr); for (i = 0; basrs[i].mask ; ++i) if (basr & basrs[i].mask) printk(",%s", basrs[i].name); printk("\nICR: %02x ", icr); for (i = 0; icrs[i].mask; ++i) if (icr & icrs[i].mask) printk(",%s", icrs[i].name); printk("\nMODE: %02x ", mr); for (i = 0; mrs[i].mask; ++i) if (mr & mrs[i].mask) printk(",%s", mrs[i].name); printk("\n"); } static struct { unsigned char value; const char *name; } phases[] = { {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, {PHASE_UNKNOWN, "UNKNOWN"}}; /* * Function : void NCR5380_print_phase(struct Scsi_Host *instance) * * Purpose : print the current SCSI phase for debugging purposes * * Input : instance - which NCR5380 */ static void NCR5380_print_phase(struct Scsi_Host *instance) { unsigned char status; int i; status = NCR5380_read(STATUS_REG); if (!(status & SR_REQ)) printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); else { for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); } } #else /* !NDEBUG */ /* dummies... */ __inline__ void NCR5380_print(struct Scsi_Host *instance) { }; __inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { }; #endif /* * ++roman: New scheme of calling NCR5380_main() * * If we're not in an interrupt, we can call our main directly, it cannot be * already running. Else, we queue it on a task queue, if not 'main_running' * tells us that a lower level is already executing it. This way, * 'main_running' needs not be protected in a special way. * * queue_main() is a utility function for putting our main onto the task * queue, if main_running is false. It should be called only from a * interrupt or bottom half. */ #include <linux/workqueue.h> #include <linux/interrupt.h> static volatile int main_running = 0; static DECLARE_WORK(NCR5380_tqueue, (void (*)(void*))NCR5380_main, NULL); static __inline__ void queue_main(void) { if (!main_running) { /* If in interrupt and NCR5380_main() not already running, queue it on the 'immediate' task queue, to be processed immediately after the current interrupt processing has finished. */ schedule_work(&NCR5380_tqueue); } /* else: nothing to do: the running NCR5380_main() will pick up any newly queued command. */ } static inline void NCR5380_all_init (void) { static int done = 0; if (!done) { INI_PRINTK("scsi : NCR5380_all_init()\n"); done = 1; } } /* * Function : void NCR58380_print_options (struct Scsi_Host *instance) * * Purpose : called by probe code indicating the NCR5380 driver * options that were selected. * * Inputs : instance, pointer to this instance. Unused. */ static void __init NCR5380_print_options (struct Scsi_Host *instance) { printk(" generic options" #ifdef AUTOSENSE " AUTOSENSE" #endif #ifdef REAL_DMA " REAL DMA" #endif #ifdef PARITY " PARITY" #endif #ifdef SUPPORT_TAGS " SCSI-2 TAGGED QUEUING" #endif ); printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); } /* * Function : void NCR5380_print_status (struct Scsi_Host *instance) * * Purpose : print commands in the various queues, called from * NCR5380_abort and NCR5380_debug to aid debugging. * * Inputs : instance, pointer to this instance. */ static void NCR5380_print_status (struct Scsi_Host *instance) { char *pr_bfr; char *start; int len; NCR_PRINT(NDEBUG_ANY); NCR_PRINT_PHASE(NDEBUG_ANY); pr_bfr = (char *) __get_free_page(GFP_ATOMIC); if (!pr_bfr) { printk("NCR5380_print_status: no memory for print buffer\n"); return; } len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0); pr_bfr[len] = 0; printk("\n%s\n", pr_bfr); free_page((unsigned long) pr_bfr); } /******************************************/ /* * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] * * *buffer: I/O buffer * **start: if inout == FALSE pointer into buffer where user read should start * offset: current offset * length: length of buffer * hostno: Scsi_Host host_no * inout: TRUE - user is writing; FALSE - user is reading * * Return the number of bytes read from or written */ #undef SPRINTF #define SPRINTF(fmt,args...) \ do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \ pos += sprintf(pos, fmt , ## args); } while(0) static char *lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length); static int NCR5380_proc_info (struct Scsi_Host *instance, char *buffer, char **start, off_t offset, int length, int inout) { char *pos = buffer; struct NCR5380_hostdata *hostdata; Scsi_Cmnd *ptr; unsigned long flags; off_t begin = 0; #define check_offset() \ do { \ if (pos - buffer < offset - begin) { \ begin += pos - buffer; \ pos = buffer; \ } \ } while (0) hostdata = (struct NCR5380_hostdata *)instance->hostdata; if (inout) { /* Has data been written to the file ? */ return(-ENOSYS); /* Currently this is a no-op */ } SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE); check_offset(); local_irq_save(flags); SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't"); check_offset(); if (!hostdata->connected) SPRINTF("scsi%d: no currently connected command\n", HOSTNO); else pos = lprint_Scsi_Cmnd ((Scsi_Cmnd *) hostdata->connected, pos, buffer, length); SPRINTF("scsi%d: issue_queue\n", HOSTNO); check_offset(); for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr)) { pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length); check_offset(); } SPRINTF("scsi%d: disconnected_queue\n", HOSTNO); check_offset(); for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = NEXT(ptr)) { pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length); check_offset(); } local_irq_restore(flags); *start = buffer + (offset - begin); if (pos - buffer < offset - begin) return 0; else if (pos - buffer - (offset - begin) < length) return pos - buffer - (offset - begin); return length; } static char * lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length) { int i, s; unsigned char *command; SPRINTF("scsi%d: destination target %d, lun %d\n", H_NO(cmd), cmd->device->id, cmd->device->lun); SPRINTF(" command = "); command = cmd->cmnd; SPRINTF("%2d (0x%02x)", command[0], command[0]); for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) SPRINTF(" %02x", command[i]); SPRINTF("\n"); return pos; } /* * Function : void NCR5380_init (struct Scsi_Host *instance) * * Purpose : initializes *instance and corresponding 5380 chip. * * Inputs : instance - instantiation of the 5380 driver. * * Notes : I assume that the host, hostno, and id bits have been * set correctly. I don't care about the irq and other fields. * */ static int NCR5380_init (struct Scsi_Host *instance, int flags) { int i; SETUP_HOSTDATA(instance); NCR5380_all_init(); hostdata->aborted = 0; hostdata->id_mask = 1 << instance->this_id; hostdata->id_higher_mask = 0; for (i = hostdata->id_mask; i <= 0x80; i <<= 1) if (i > hostdata->id_mask) hostdata->id_higher_mask |= i; for (i = 0; i < 8; ++i) hostdata->busy[i] = 0; #ifdef SUPPORT_TAGS init_tags(); #endif #if defined (REAL_DMA) hostdata->dma_len = 0; #endif hostdata->targets_present = 0; hostdata->connected = NULL; hostdata->issue_queue = NULL; hostdata->disconnected_queue = NULL; hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT; if (!the_template) { the_template = instance->hostt; first_instance = instance; } #ifndef AUTOSENSE if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1)) printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" " be incorrectly cleared.\n", HOSTNO); #endif /* def AUTOSENSE */ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); NCR5380_write(MODE_REG, MR_BASE); NCR5380_write(TARGET_COMMAND_REG, 0); NCR5380_write(SELECT_ENABLE_REG, 0); return 0; } /* * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd, * void (*done)(Scsi_Cmnd *)) * * Purpose : enqueues a SCSI command * * Inputs : cmd - SCSI command, done - function called on completion, with * a pointer to the command descriptor. * * Returns : 0 * * Side effects : * cmd is added to the per instance issue_queue, with minor * twiddling done to the host specific fields of cmd. If the * main coroutine is not running, it is restarted. * */ /* Only make static if a wrapper function is used */ static int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *)) { SETUP_HOSTDATA(cmd->device->host); Scsi_Cmnd *tmp; unsigned long flags; #if (NDEBUG & NDEBUG_NO_WRITE) switch (cmd->cmnd[0]) { case WRITE_6: case WRITE_10: printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n", H_NO(cmd)); cmd->result = (DID_ERROR << 16); done(cmd); return 0; } #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ #ifdef NCR5380_STATS # if 0 if (!hostdata->connected && !hostdata->issue_queue && !hostdata->disconnected_queue) { hostdata->timebase = jiffies; } # endif # ifdef NCR5380_STAT_LIMIT if (cmd->request_bufflen > NCR5380_STAT_LIMIT) # endif switch (cmd->cmnd[0]) { case WRITE: case WRITE_6: case WRITE_10: hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; hostdata->pendingw++; break; case READ: case READ_6: case READ_10: hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; hostdata->pendingr++; break; } #endif /* * We use the host_scribble field as a pointer to the next command * in a queue */ NEXT(cmd) = NULL; cmd->scsi_done = done; cmd->result = 0; /* * Insert the cmd into the issue queue. Note that REQUEST SENSE * commands are added to the head of the queue since any command will * clear the contingent allegiance condition that exists and the * sense data is only guaranteed to be valid while the condition exists. */ local_irq_save(flags); /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. * Otherwise a running NCR5380_main may steal the lock. * Lock before actually inserting due to fairness reasons explained in * atari_scsi.c. If we insert first, then it's impossible for this driver * to release the lock. * Stop timer for this command while waiting for the lock, or timeouts * may happen (and they really do), and it's no good if the command doesn't * appear in any of the queues. * ++roman: Just disabling the NCR interrupt isn't sufficient here, * because also a timer int can trigger an abort or reset, which would * alter queues and touch the lock. */ if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { LIST(cmd, hostdata->issue_queue); NEXT(cmd) = hostdata->issue_queue; hostdata->issue_queue = cmd; } else { for (tmp = (Scsi_Cmnd *)hostdata->issue_queue; NEXT(tmp); tmp = NEXT(tmp)) ; LIST(cmd, tmp); NEXT(tmp) = cmd; } local_irq_restore(flags); QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd), (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); /* If queue_command() is called from an interrupt (real one or bottom * half), we let queue_main() do the job of taking care about main. If it * is already running, this is a no-op, else main will be queued. * * If we're not in an interrupt, we can call NCR5380_main() * unconditionally, because it cannot be already running. */ if (in_interrupt() || ((flags >> 8) & 7) >= 6) queue_main(); else NCR5380_main(NULL); return 0; } /* * Function : NCR5380_main (void) * * Purpose : NCR5380_main is a coroutine that runs as long as more work can * be done on the NCR5380 host adapters in a system. Both * NCR5380_queue_command() and NCR5380_intr() will try to start it * in case it is not running. * * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should * reenable them. This prevents reentrancy and kernel stack overflow. */ static void NCR5380_main (void *bl) { Scsi_Cmnd *tmp, *prev; struct Scsi_Host *instance = first_instance; struct NCR5380_hostdata *hostdata = HOSTDATA(instance); int done; unsigned long flags; /* * We run (with interrupts disabled) until we're sure that none of * the host adapters have anything that can be done, at which point * we set main_running to 0 and exit. * * Interrupts are enabled before doing various other internal * instructions, after we've decided that we need to run through * the loop again. * * this should prevent any race conditions. * * ++roman: Just disabling the NCR interrupt isn't sufficient here, * because also a timer int can trigger an abort or reset, which can * alter queues and touch the Falcon lock. */ /* Tell int handlers main() is now already executing. Note that no races are possible here. If an int comes in before 'main_running' is set here, and queues/executes main via the task queue, it doesn't do any harm, just this instance of main won't find any work left to do. */ if (main_running) return; main_running = 1; local_save_flags(flags); do { local_irq_disable(); /* Freeze request queues */ done = 1; if (!hostdata->connected) { MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO ); /* * Search through the issue_queue for a command destined * for a target that's not busy. */ #if (NDEBUG & NDEBUG_LISTS) for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) ; if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/ #endif for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) { #if (NDEBUG & NDEBUG_LISTS) if (prev != tmp) printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun); #endif /* When we find one, remove it from the issue queue. */ /* ++guenther: possible race with Falcon locking */ if ( #ifdef SUPPORT_TAGS !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) #else !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun)) #endif ) { /* ++guenther: just to be sure, this must be atomic */ local_irq_disable(); if (prev) { REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); NEXT(prev) = NEXT(tmp); } else { REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); hostdata->issue_queue = NEXT(tmp); } NEXT(tmp) = NULL; /* reenable interrupts after finding one */ local_irq_restore(flags); /* * Attempt to establish an I_T_L nexus here. * On success, instance->hostdata->connected is set. * On failure, we must add the command back to the * issue queue so we can keep trying. */ MAIN_PRINTK("scsi%d: main(): command for target %d " "lun %d removed from issue_queue\n", HOSTNO, tmp->target, tmp->lun); /* * REQUEST SENSE commands are issued without tagged * queueing, even on SCSI-II devices because the * contingent allegiance condition exists for the * entire unit. */ /* ++roman: ...and the standard also requires that * REQUEST SENSE command are untagged. */ #ifdef SUPPORT_TAGS cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE ); #endif if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { break; } else { local_irq_disable(); LIST(tmp, hostdata->issue_queue); NEXT(tmp) = hostdata->issue_queue; hostdata->issue_queue = tmp; #ifdef SUPPORT_TAGS cmd_free_tag( tmp ); #endif local_irq_restore(flags); MAIN_PRINTK("scsi%d: main(): select() failed, " "returned to issue_queue\n", HOSTNO); if (hostdata->connected) break; } } /* if target/lun/target queue is not busy */ } /* for issue_queue */ } /* if (!hostdata->connected) */ if (hostdata->connected #ifdef REAL_DMA && !hostdata->dma_len #endif ) { local_irq_restore(flags); MAIN_PRINTK("scsi%d: main: performing information transfer\n", HOSTNO); NCR5380_information_transfer(instance); MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO); done = 0; } } while (!done); /* Better allow ints _after_ 'main_running' has been cleared, else an interrupt could believe we'll pick up the work it left for us, but we won't see it anymore here... */ main_running = 0; local_irq_restore(flags); } #ifdef REAL_DMA /* * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) * * Purpose : Called by interrupt handler when DMA finishes or a phase * mismatch occurs (which would finish the DMA transfer). * * Inputs : instance - this instance of the NCR5380. * */ static void NCR5380_dma_complete( struct Scsi_Host *instance ) { SETUP_HOSTDATA(instance); int transfered; unsigned char **data; volatile int *count; if (!hostdata->connected) { printk(KERN_WARNING "scsi%d: received end of DMA interrupt with " "no connected cmd\n", HOSTNO); return; } DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)); if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO); printk("please e-mail sammy@sammy.net with a description of how this\n"); printk("error was produced.\n"); BUG(); } /* make sure we're not stuck in a data phase */ if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK)) { printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG)); printk("scsi%d: bus stuck in data phase -- probably a single byte " "overrun!\n", HOSTNO); printk("not prepared for this error!\n"); printk("please e-mail sammy@sammy.net with a description of how this\n"); printk("error was produced.\n"); BUG(); } (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); NCR5380_write(MODE_REG, MR_BASE); NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); transfered = hostdata->dma_len - NCR5380_dma_residual(instance); hostdata->dma_len = 0; data = (unsigned char **) &(hostdata->connected->SCp.ptr); count = &(hostdata->connected->SCp.this_residual); *data += transfered; *count -= transfered; } #endif /* REAL_DMA */ /* * Function : void NCR5380_intr (int irq) * * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses * from the disconnected queue, and restarting NCR5380_main() * as required. * * Inputs : int irq, irq that caused this interrupt. * */ static irqreturn_t NCR5380_intr (int irq, void *dev_id, struct pt_regs *regs) { struct Scsi_Host *instance = first_instance; int done = 1, handled = 0; unsigned char basr; INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO); /* Look for pending interrupts */ basr = NCR5380_read(BUS_AND_STATUS_REG); INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr); /* dispatch to appropriate routine if found and done=0 */ if (basr & BASR_IRQ) { NCR_PRINT(NDEBUG_INTR); if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) { done = 0; ENABLE_IRQ(); INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO); NCR5380_reselect(instance); (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); } else if (basr & BASR_PARITY_ERROR) { INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO); (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO); (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); } else { /* * The rest of the interrupt conditions can occur only during a * DMA transfer */ #if defined(REAL_DMA) /* * We should only get PHASE MISMATCH and EOP interrupts if we have * DMA enabled, so do a sanity check based on the current setting * of the MODE register. */ if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO); NCR5380_dma_complete( instance ); done = 0; ENABLE_IRQ(); } else #endif /* REAL_DMA */ { /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */ if (basr & BASR_PHASE_MATCH) INT_PRINTK("scsi%d: unknown interrupt, " "BASR 0x%x, MR 0x%x, SR 0x%x\n", HOSTNO, basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); #ifdef SUN3_SCSI_VME dregs->csr |= CSR_DMA_ENABLE; #endif } } /* if !(SELECTION || PARITY) */ handled = 1; } /* BASR & IRQ */ else { printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, " "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); #ifdef SUN3_SCSI_VME dregs->csr |= CSR_DMA_ENABLE; #endif } if (!done) { INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO); /* Put a call to NCR5380_main() on the queue... */ queue_main(); } return IRQ_RETVAL(handled); } #ifdef NCR5380_STATS static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd* cmd) { # ifdef NCR5380_STAT_LIMIT if (cmd->request_bufflen > NCR5380_STAT_LIMIT) # endif switch (cmd->cmnd[0]) { case WRITE: case WRITE_6: case WRITE_10: hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase); /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/ hostdata->pendingw--; break; case READ: case READ_6: case READ_10: