linux/Documentation/filesystems/spufs.txt
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.10.v3./spaalu v3./formlu v3.a .10.v3 href="../linux+v3ue=1/Documentan va/filesystems/spufs.txt">.10.v3.img src="../.stan c/gfx/right.png" alt=">>">.1./spaalu.1.spaa class="lxr_search">.10..10.v3.input typtiohidden" namtionavtarget" tio">.10.v3.input typtiotext" namtiosearch" idiosearch">.10.v3.butt dtyptiosubmit">Search.10.v3Prefsu v3./a>.1./spaalu0.v3 3./divlu0.v3 3.form acn va="ajax+*" method="post" onsubmit="return false;">.1.input typtiohidden" namtioajax_lookup" idioajax_lookup" tio">.0.v3 3./formlu.0.v3 3.div class="headingbott m">3 31./a>SPUFS(2) Linux3Programmer's Manual SPUFS(2) 3 32./a>.3 33./a>.3 34./a>.3 35./a>NAME.3 36./a> spufs - the SPU file system.3 37./a>.3 38./a>.3 39./a>DESCRIPTION.3 1" a> The SPU file system is used on PowerPC machines that implement the Cell.3 11 a> Broadband Engine Architecture in order to access Synergisn cv3Processor.3 12 a> Units (SPUs)..3 13./a>.3 14 a> The file system provides a namt spact similar to posix shared memory or.3 15 a> message queues. Users that have write permiss vas on the file system.3 16./a> caa use spu_create(2) to establish SPU contexts in the spufs root..3 17./a>.3 18./a> Every SPU context is represented by a directory containing a predefined.3 19./a> set of files. These files caa be used for manipulan ng the stane of the 3 2" a> logical SPU. Users caa change permiss vas on those files, but not acnu- 3 21 a> ally add or remove files..3 22./a>.3 23./a>.3 24 a>MOUNT OPTIONS.3 25 a> uidi<uid>.3 26./a> set the user own ng the mount point, the default is 0 (root)..3 27./a>.3 28./a> gidi<gid>.3 29./a> set the group own ng the mount point, the default is 0 (root)..3 30./a>.3 31./a>.3 32./a>FILES.3 33 a> The files in spufs mostly follow the standard behavior for regular sys- 3 34 a> tem calls like read(2) or write(2), but often support only a subset of 3 35 a> the operan vas supported on regular file systems. This list details the 3 36./a> supported operan vas and the devian vas from the behaviour in the 3 37./a> respective man pages..3 38./a>.3 39./a> All files that support the read(2) operan va also support readv(2) and.3 40 a> all files that support the write(2) operan va also support writev(2)..3 41./a> All files support the access(2) and stan(2) family of operan vas, but.3 42 a> only the st_mode, st_nlink, st_uid and st_gid fields of struct stan.3 43 a> contain reliable informan va..3 44./a>.3 45./a> All files support the chmod(2)/fchmod(2) and chown(2)/fchown(2) opera- 3 46./a> n vas, but will not be able to grant permiss vas that contradict the 3 47./a> poss ble operan vas, e.g. read access on the wbox file..3 48./a>.3 49 a> The current set of files is:.3 50./a>.3 51./a>.3 52 a> /mem.3 53 a> the contents of the local storage memory of the SPU. This caa be.3 54 a> accessed like a regular shared memory file and contains both code and.3 55./a> data in the address spact of the SPU. The poss ble operan vas on an.3 56./a> open mem file are:.3 57./a>.3 58./a> read(2), pread(2), write(2), pwrite(2), lseek(2) 3 59./a> These operane as documented, with the exce.2" dthat seek(2),.3 60./a> write(2) and pwrite(2) are not supported beyond the end of the.3 61./a> file. The file size is the size of the local storage of the SPU,.3 62./a> which normally is 256 kilobytes..3 63./a>.3 64 a> mmap(2) 3 65./a> Mapp ng mem into the process address spact gives access to the.3 66./a> SPU local storage within the process address spact. Only.3 67./a> MAP_SHARED mapp ngs are allowed..3 68./a>.3 69./a>.3 70 a> /mbox.3 71 a> The first SPU to CPU communican va mailbox. This file is read-only and.3 72./a> caa be read in units of 32 bits. The file caa only be used in non- 3 73 a> block ng mode and it even poll() will not block on it. The poss ble 3 74./a> operan vas va an open mbox file are:.3 75./a>.3 76./a> read(2).3 77./a> If a count smaller than four is requested, read returns -1 and.3 78./a> sets errno to EINVAL. If there is no data available in the mail.3 79./a> box, the return t is set to -1 and errno becomes EAGAIN..3 80./a> When data has been read successfully, four bytes are plactd in.3 81./a> the data buffer and the t four is returned..3 82./a>.3 83./a>.3 84./a> /ibox.3 85 a> The second SPU to CPU communican va mailbox. This file is similar to.3 86./a> nhe first mailbox file, but caa be read in block ng I/O mode, and the.3 87./a> poll family of system calls caa be used to wait for it. The poss ble 3 88./a> operan vas va an open ibox file are:.3 89./a>.3 90./a> read(2).3 91./a> If a count smaller than four is requested, read returns -1 and.3 92./a> sets errno to EINVAL. If there is no data available in the mail.3 93./a> box and the file descriptor has been opened with O_NONBLOCK, the.3 94./a> return t is set to -1 and errno becomes EAGAIN..3 95./a>.3 96./a> If thert is no data available in the mail box and the file.3 97./a> descriptor has been opened without O_NONBLOCK, the call will.3 98./a> block until the SPU writes to its interrupt mailbox channel..3 99./a> When data has been read successfully, four bytes are plactd in.3100./a> the data buffer and the t four is returned..3101./a>.3102./a> poll(2).3103./a> Poll on the ibox file returns (POLLIN | POLLRDNORM) whenever.3104./a> data is available for reading..3105./a>.3106./a>.3107./a> /wbox.3108 a> The CPU to SPU communan va mailbox. It is write-only and caa be written.3109./a> in units of 32 bits. If the mailbox is full, write() will block and.311" a> poll caa be used to wait for it becom ng empty again. The poss ble 3111 a> operan vas on an open wbox file are: write(2) If a count smaller than 3112 a> four is requested, write returns -1 and sets errno to EINVAL. If there 3113./a> is no spact available in the mail box and the file descriptor has been 3114./a> opened with O_NONBLOCK, the return t is set to -1 and errno becomes 3115 a> EAGAIN..3116./a>.3117./a> If thert is no spact available in the mail box and the file descriptor.3118./a> has been opened without O_NONBLOCK, the call will block until the SPU.3119./a> reads from its PPE mailbox channel. When data has been read success- 312" a> fully, four bytes are plactd in the data buffer and the t four is 3121 a> returned..3122./a>.3123./a> poll(2).3124./a> Poll on the ibox file returns (POLLOUT | POLLWRNORM) whenever.3125./a> spact is available for writing..3126./a>.3127./a>.3128./a> /mbox_stan.3129./a> /ibox_stan.3130./a> /wbox_stan.3131 a> Read-only files that contain the length of the current queue, i.t. how.3132 a> many words caa be read from mbox or ibox or how many words caa be.3133 a> written to wbox without block ng. The files caa be read only in 4-byte.3134 a> units and return a big-endiaa binary integer number. The poss ble.3135 a> operan vas va an open *box_stan file are:.3136./a>.3137./a> read(2).3138./a> If a count smaller than four is requested, read returns -1 and.3139./a> sets errno to EINVAL. Otherwise, a four byte t is plactd in.3140./a> the data buffer, containing the number of elements that caa be.3141./a> read from (for mbox_stan and ibox_stan) or written to (for.3142./a> wbox_stan) the respective mail box without block ng or result ng.3143./a> in EAGAIN..3144./a>.3145./a>.3146./a> /npc.3147./a> /decr.3148./a> /decr_stanus 3149 a> /spu_tag_mask 3150./a> /event_mask 3151 a> /srr0 3152./a> Internal regisners of the SPU. The representan va is an ASCII str ng.3153 a> with the numeric t of the next instruct" dto be executed. These.3154 a> caa be used in read/write mode for debugg ng, but normal operan va of 3155./a> programs should not rely on them because access to any of them exce.2 3156./a> npc requires an SPU context save and is thertfore ery inefficient..3157./a>.3158 a> The contents of these files are:.3159./a>.3160./a> npc Next Program Counter.3161./a>.3162./a> decr SPU Decrementer.3163./a>.3164 a> decr_stanus Decrementer Stanus 3165./a>.3166./a> spu_tag_mask MFC tag mask for SPU DMA.3167./a>.3168 a> event_mask Event mask for SPU interrupts 3169./a>.3170./a> srr0 Interrupt Return address regisner.3171./a>.3172./a>.3173 a> The poss ble operan vas on an open npc, decr, decr_stanus,.3174./a> spu_tag_mask, event_mask or srr0 file are:.3175./a>.3176./a> read(2).3177./a> When the count supplied to the read call is shorter than the.3178./a> required length for the pointer t plus a newline character,.3179./a> subsequent reads from the samt file descriptor will result in.3180./a> complen ng the str ng, regardless of changes to the regisner by.3181./a> a running SPU task. When a complene str ng has been read, all.3182./a> subsequent read operan vas will return zero bytes and a new file.3183./a> descriptor needs to be opened to read the t again..3184./a>.3185 a> write(2).3186./a> A write operan va on the file results in setn ng the regisner to.3187./a> the t given in the str ng. The str ng is parsed from the.3188./a> beginning to the first non-numeric character or the end of the.3189./a> buffer. Subsequent writes to the samt file descriptor overwrite.3190./a> the previous setn ng..3191./a>.3192./a>.3193./a> /fpcr.3194 a> This file gives access to the Floan ng Point Stanus and Control Regis- 3195 a> ter as a four byte long file. The operan vas va the fpcr file are:.3196./a>.3197./a> read(2).3198./a> If a count smaller than four is requested, read returns -1 and.3199./a> sets errno to EINVAL. Otherwise, a four byte t is plactd in.3200./a> the data buffer, containing the current t of the fpcr regis- 3201./a> ter. 3202./a>.3203 a> write(2).3204./a> If a count smaller than four is requested, write returns -1 and.3205./a> sets errno dto EINVAL. Otherwise, a four byte t is copied.3206./a> from the data buffer, updan ng the t of the fpcr register. 3207./a>.3208./a>.3209 a> /signal1.321" a> /signal2.3211 a> The two signal notifican va channels of an SPU. These are read-write.3212 a> files that operane on a 32 bit word. Writingdto one of these files.3213./a> tr ggers an interrupt va the SPU. The t written to the signal.3214./a> files caa be read from the SPU through a channel read or from host user.3215 a> spact through the file. Afner the t has been read by the SPU, it.3216./a> is reset to zero. The poss ble operan vas va an open signal1 or sig- 3217./a> nal2 file are:.3218./a>.3219./a> read(2).3220./a> If a count smaller than four is requested, read returns -1 and.3221./a> sets errno to EINVAL. Otherwise, a four byte t is plactd in.3222./a> the data buffer, containing the current t of the specified.3223./a> signal notifican va register. 3224./a>.3225 a> write(2).3226./a> If a count smaller than four is requested, write returns -1 and.3227./a> sets errno to EINVAL. Otherwise, a four byte t is copied.3228./a> from the data buffer, updan ng the t of the specified signal.3229./a> notifican va register. The signal notifican va regisner will.3230./a> either be replactd with the input data or will be updaned to the.3231./a> bitwise OR or the old t and the input data, depending on the 3232./a> contents of the signal1_typt, or signal2_typt respectively,.3233./a> file..3234./a>.3235./a>.3236./a> /signal1_typt.3237./a> /signal2_typt.3238 a> These two files change the behavior of the signal1 and signal2 notifi- 3239./a> can va files. The contain a numerical ASCII str ng which is read as.3240./a> either "1" or "0". In mode 0 (overwrite), the hardware replacts the.3241./a> contents of the signal channel with the data that is written to it. in.3242./a> mode 1 (logical OR), the hardware accumulanes the bits that are subse- 3243./a> quently written to it. The poss ble operan vas va an open signal1_typt.3244./a> or signal2_typt file are:.3245./a>.3246./a> read(2).3247./a> When the count supplied to the read call is shorter than the.3248./a> required length for the digit plus a newline character, subse- 3249./a> quent reads from the samt file descriptor will result in com- 3250./a> plen ng the str ng. When a complene str ng has been read, all.3251./a> subsequent read operan vas will return zero bytes and a new file.3252./a> descriptor needs to be opened to read the t again..3253./a>.3254 a> write(2).3255./a> A write operan va on the file results in setn ng the regisner to.3256./a> the t given in the str ng. The str ng is parsed from the.3257./a> beginning to the first non-numeric character or the end of the.3258./a> buffer. Subsequent writes to the samt file descriptor overwrite.3259./a> the previous setn ng..3260./a>.3261./a>.3262./a>EXAMPLES.3263./a> /etc/fstab entry.3264./a> none /spu spufs gidispu 0 0 3265./a>.3266./a>.3267./a>AUTHORS.3268 a> Arnd Bergmann <arndb@de.ibm.com>, Mark Nutter <mnutter@us.ibm.com>,.3269./a> Ulrich Weigand <Ulrich.Weigand@de.ibm.com>.3270./a>.3271./a>SEE ALSO.3272./a> capabilities(7), close(2), spu_create(2), spu_run(2), spufs(7).3273./a>.3274./a>.3275./a>.3276./a>Linux 2005-09-28 SPUFS(2).3277./a>.3278./a>------------------------------------------------------------------------------.3279./a>.3280./a>SPU_RUN(2) Linux Programmer's Manual SPU_RUN(2).3281./a>.3282./a>.3283./a>.3284./a>NAME.3285 a> spu_run - execute an spu context.3286./a>.3287./a>.3288./a>SYNOPSIS.3289./a> #include <sys/spu.h>.3290./a>.3291./a> int spu_run(int fd, unsigntd int *npc, unsigntd int *event);.3292./a>.3293./a>DESCRIPTION.3294 a> The spu_run system call is used on PowerPC machines that implement the.3295 a> Cell Broadband Engine Architecture in order to access Synergistic Pro-.3296./a> cessor Units (SPUs). It uses the fd that was returned from spu_cre-.3297./a> ate(2) to address a specific SPU context. When the context gets sched-.3298./a> uled to a physical SPU, it starts execut va at the instruct" dpointer.3299./a> passed in npc..3300./a>.3301./a> Execut va of SPU code happens synchronously, meaning that spu_run does.3302./a> not return while the SPU is still running. If there is a need to exe-.3303 a> cute SPU code in parallel with other code va either the main CPU or.3304./a> other SPUs, you need to create a new thread of execut va first, e.g..3305./a> us ng the pthread_create(3) call..3306./a>.3307./a> When spu_run returns, the current t of the SPU instruct" ddpointer.3308 a> is written back to npc, so you caa call spu_run again without updan ng.3309./a> the pointers..3310./a>.3311 a> event caa be a NULL pointer or point to an extended stanus code that.3312 a> gets filled when spu_run returns. It caa be one of the follow ng con-.3313./a> stants:.3314./a>.3315 a> SPE_EVENT_DMA_ALIGNMENT.3316./a> A DMA alignment error.3317./a>.3318./a> SPE_EVENT_SPE_DATA_SEGMENT.3319./a> A DMA segmentan va error.3320./a>.3321./a> SPE_EVENT_SPE_DATA_STORAGE.3322./a> A DMA storage error.3323./a>.3324./a> If NULL is passed as the event argument, these errors will result in a.3325 a> signal delivered to the call ng process..3326./a>.3327./a>RETURN VALUE.3328./a> spu_run returns the t of the spu_stanus regisner or -1 to indicane.3329./a> aa error and set errno to one of the error codes lisned below. The.3330./a> spu_stanus regisner t contains a bit mask of stanus codes and.3331 a> opn vaally a 14 bit code returned from the stop-and-signal instruct" .3332./a> va the SPU. The bit masks for the stanus codes are:.3333./a>.3334 a> 0x02 SPU was stopped by stop-and-signal..3335./a>.3336 a> 0x04 SPU was stopped by halt..3337./a>.3338 a> 0x08 SPU is waitingdfor a channel..3339./a>.3340./a> 0x10 SPU is in single-step mode..3341./a>.3342./a> 0x20 SPU has tried to execute an in id instruct" ..3343./a>.3344 a> 0x40 SPU has tried to access an in id channel..3345./a>.3346 a> 0x3fff0000.3347./a> The bits masktd with this t contain the code returned from.3348./a> stop-and-signal..3349./a>.3350./a> There are always one or more of the lower eight bits set or an error.3351./a> code is returned from spu_run..335ntan va/filesystems/spufs.txt#L350" idioL350" class=cumentanread call is s./a> mode>32533/a>.32543 a> wriAIN..< anEWOULDCK, t href="Documentan va/filesystems/spufs.txt#L2683 idioL345" class="line" namtioL2553>32553/a> A wfd in sin-numck ng or e 1 ( set run rewd notck nga href="Documentan va/filesystems/spufs.txt#L352" idioL346" class="line" namtioL2563>325635a>.32573/a> EBADF wfd in rea id chae descriptor ova href="Documentan va/filesystems/spufs.txt#L352" idioL348" class="line" namtioL2583>325835a>.32593/a> EFAULTc in rea id chanter or poinus codin her thL is na chaid ch href="Documentan va/filesystems/spufs.txt#L2193 idioL2603 class="line" namtioL2603>326036a> plenter ora href="Documentan va/filesystems/spufs.txt#L352" idioL2613 class="line" namtioL2613>32613/a>.32623/a> decEINTR DMAnal inocrent dile the run rewan singrams..326336a> fil trien reaaned to the.326436a>.3265365> decEINVALwfd in rea e descriptor oveurned from spu_cre-.<(2) toa href="Documentan va/filesystems/spufs.txt#L352" idioL346" class="line" namtioL2663>32663/a>.326736a> ENOMEM Insucient..< mee oyewan availa opetheneldare: p errfa in ult ina href="Documentan va/filesystems/spufs.txt#L313" idioL2683 class="line" namtioL2683>326836a> stodfor spu er tagdirec< mee oyeess ana href="Documentan va/filesystems/spufs.txt#L352" idioL2593 class="line" namtioL2693>32693/a>.32703/a> srrENOSYSe folluncaally ity in regravidey the SPrent tems/s,cause ac href="Documentan va/filesystems/spufs.txt#L1703 idioL2613 class="line" namtioL2713>327137a> subher th hardware accs.327237a> A D reloadeya href="Documentan va/filesystems/spufs.txt#L352" idioL2733 class="line" namtioL2733>32733/a>.32743/a>.32753/a>.327637a> spu_tag ret wriningto zer used in om thelibrarithat implement theare of href="Documentan va/filesystems/spufs.txt#L2633 idioL2673 class="line" namtioL2773>32773/a> abstter terrupf throoUs, yo rebe opeu from thegisnulaan ied va fna href="Documentan va/filesystems/spufs.txt#L352" idioL2783 class="line" namtioL2783>32783/a> Seusehref="Dochttp://www.bsc.es/grajechttp://www.bsc.es/grajec the stareca href="Documentan va/filesystems/spufs.txt#L313" idioL2793 class="line" namtioL2793>32793/a> ommed stlibraritha href="Documentan va/filesystems/spufs.txt#L352" idioL2803 class="line" namtioL2803>328038a>.32813/a>.32823/a>.328338a> The copi is useux Procific SPU setonlyplement they the SPppc64 aitectura href="Documentan va/filesystems/spufs.txt#L313" idioL2843 class="line" namtioL2843>328438a> wrie in.ogrammers ng the pstilem call is acc regorta opa href="Documentan va/filesystems/spufs.txt#L352" idioL2753 class="line" namtioL2853>328538a>.32863/a>.32873/a>.328838a> The contedccs.328938a>.32903/a>.32913/a> HORS.< href="Documentan va/filesystems/spufs.txt#L2913 idioL2823 class="line" namtioL2923>329239a> d Begmann &l;arndb@de.ibm.com>, href="Documentan va/filesystems/spufs.txt#L2913 idioL2833 class="line" namtioL2933>329339a>.32943 a> ALSO.32953 a> Celabilities(7), close(2), spu_create(2), spu_ru7).32963/a>.329739a>.329839a>.32993/a> Lx 2005-09-28 S_RUN(2).33004/a>.33014/a> ---------------------------------------------------------------------------.33024/a>.33034 a> _RUNCREATE Lx Programmer's Manual _RUNCREATE href="Documentan va/filesystems/spufs.txt#L2034 4dioL3034 class="line" namtioL2944>330440a>.330540a>.33064/a>.33074/a> E.330840a> spu_runate a n-eate a new thrscontext.330940a>.33104/a>.33114 a> OPSIS.33124 a> getclude <sys/sput fisgt;.33134/a> staclude <sys/spu.h>.33144/a>.33154 a> SPE spu_runate(2),texstaract *pathtioL,E spuflags, e 1 _t e 1 331641a>.33174/a>.331841a> The conu_runate a nstem call is used on PowerPC machines that implement th href="Documentan va/filesystems/spufs.txt#L2944 idioL3094 class="line" namtioL3194>331941a> the poil Broadband Engine Architecture in order to acccess an nergistic P href="Documentan va/filesystems/spufs.txt#L2944 idioL3204 class="line" namtioL3204>33204/a> Pess..< Units (SUs). Itcaa te a newlin ical OR)text get a chnU instr href="Documentan va/filesystems/spufs.txt#L2944 idioL3114 class="line" namtioL3214>33214/a> SPEpathtioLU seturns theaeneldareacce.< cid to th thi. TheEpathtioLU mush href="Documentan va/filesystems/spufs.txt#L2944 idioL3224 class="line" namtioL3224>33224/a> nt to accceone -exic nggdirec< oyethe codmt supnt to the SPU insesys href="Documentan va/filesystems/spufs.txt#L2944 idioL3134 class="line" namtioL3234>33234/a> tem cal(fs.tx).hen spu_runate a nstiluss anful foudirec< oyets fil-.33244/a> If d to poinathtioLU setis wripopnes tith thiesysta href="Documentan va/filesystems/spufs.txt#L3524 idioL3254 class="line" namtioL3254>332542a>.33264/a> conuurned fro e deseneldare be onlypbessed as accsrun(2), s these(2)da href="Documentan va/filesystems/spufs.txt#L2694 idioL3274 class="line" namtioL3274>33274/a> er SPran vas wil acc redef" neton. 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class="line" namtioL3394>33394/a>.334044a> There e 1 (allemeu cified she an misss wilu fromtheste a the pthwlin href="Documentan va/filesystems/spufs.txt#L3404 idioL3314 class="line" namtioL3414>33414/a> condirec< oyet a.33424/a> 0x2 the innlu fromthebothe datairec< oye the inpesystntain thin npc Th.33434/a> quee desan misss wilk of sut somf e of s setthee 1 (ause ace iny typl SPla href="Documentan va/filesystems/spufs.txt#L2644 idioL3444 class="line" namtioL3444>33444 a> 0x4plieort onlypd or frote opeess ana Seusnus , s a chalullsned U the s href="Documentan va/filesystems/spufs.txt#L2644 idioL3354 class="line" namtioL3454>3345445> aa ntble opee 1 ( t cota href="Documentan va/filesystems/spufs.txt#L3524 idioL3464 class="line" namtioL3464>334644a>.334744a>.33484/a> URN VALUE.33494/a> _runate a nsurns theae file.33504/a> Theerror andtaidia err set errno to onee or the sigor codes lisned b href="Documentan va/filesystems/spufs.txt#L3294 idioL3314 class="line" namtioL3514>33514/a> codow. 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