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SysLink, essential fast functions and memory placement

Graham Bartlett
Intellectual 460 points
Other Parts Discussed in Thread: OMAP-L138

In another post I asked about SysLink HWIs.

One other problem I have is trying to get SysLink working efficiently so that it does its thing and then gets out of the way.  I have a problem here, because I don't have enough IRAM (L2 RAM) for the entire program and data, so some of the program has to live in external DDR.  As far as my application is concerned, getting settings from the ARM to the DSP can be a slower process, so I have no problems with all that living in external DDR.

This is a problem for the SysLink HWIs (and perhaps SWIs if they create them too) though.  If a HWI takes a long time to run, it's going to get in the way of SWIs.  Also if the HWI is running from external DDR, it could be triggering cache invalidates which will cause all sorts of fun for the rest of the application.  And unfortunately there isn't enough space left to put the entire SysLink library in IRAM.

From the SysLink library, are there some functions which definitely should live closer to the DSP core for best performance?  And are there some functions which can definitely be left further away, because they don't matter so much?  Some advice on how best to place these library functions in the linker command file would be very helpful, please.

  • 0
    TI__Genius 12865 points

    Hi Graham,

    Fundamentally this is an application-dependent question. Which device are you on? You would need to identify which SysLInk modules you are using, see which APIs are called most often and which ones are called during critical paths in your application.

    That said, HWI functions are good ones to have in fast memory. If you can share the .map file of your application, I can maybe help you identify which ones are used in HWIs.

    Best regards,

    Vincent

  • 0 in reply to Vincent W.
    Intellectual 460 points

    Thanks Vincent.  This is on the DSP core of an OMAP-L138.  From IPC I'm only actually using Notify events on a regular basis, which is how the ARM and DSP trigger each other to do stuff.  Data passing is handled by using SharedRegion to allocate some of the onboard (L3) dual-port memory at startup for a defined data structure (with cache invalidate calls to ensure the shared memory is up-to-date).  The two cores then write to the relevant places in this data structure, and Notify events trigger one side or the other to look for new values.  I don't use SharedRegion after startup though, so it's not important for that to run quickly.

    I don't actually care if Notify events are handled quickly.  All I care about are that all IPC HWIs and SWIs finish as quickly as possible and get out of the way of everyone else.  So every HWI or SWI, and every function that could be called from a HWI or SWI, I need to get those out of the slow external DDR.

    I've attached an excerpt from the MAP file listing all the functions which are currently in slow memory (DDR).  If you could help identify which functions are used by IPC HWIs and SWIs, that would be great, thanks.

    Graham.

    ******************************************************************************
                   TMS320C6x Linker Unix v7.4.4                    
    ******************************************************************************
    >> Linked Wed Oct 29 20:10:33 2014
    OUTPUT FILE NAME:   <npc5000_dsp.xe674>
    ENTRY POINT SYMBOL: "ti_sysbios_family_c64p_Hwi0"  address: 11815000

    MEMORY CONFIGURATION
             name            origin    length      used     unused   attr    fill
    ----------------------  --------  ---------  --------  --------  ----  --------
      IROM                  11700000   00100000  00000000  00100000  R  X
      IRAM                  11800000   00020000  0001506f  0000af91  RW X
      L1DSRAM               11f00000   00004000  00001000  00003000  RW  
      L3_CBA_RAM            80000000   00020000  00020000  00000000  RW X
      DDR_SYSLINK           c7000000   00800000  00800000  00000000  RW X
      DDR_IPC_SHARED        c7800000   00700000  00000000  00700000  RW X
      DDR_DSP               c7f00000   00100000  00056ed0  000a9130  RW X

    SEGMENT ALLOCATION MAP
    run origin  load origin   length   init length attrs members
    ----------  ----------- ---------- ----------- ----- -------
    11800000    11800000    00011d00   00011d00    r-x
      11800000    11800000    00005a00   00005a00    r-x critical_sysbios_library_code
      11805a00    11805a00    00006140   00006140    r-x critical_code
      1180bb40    1180bb40    00003120   00003120    r-x fast_code
      1180ec60    1180ec60    00001ca0   00001ca0    r-x critical_kernel_code
      11810900    11810900    000013e0   000013e0    r-x critical_sysbios_local_code
      11811ce0    11811ce0    00000020   00000020    r-- .const.1
    11811d00    11811d00    00000ea8   00000ea8    rw-
      11811d00    11811d00    00000ea8   00000ea8    rw- critical_data
    11812ba8    11812ba8    00000b0a   00000b0a    r--
      11812ba8    11812ba8    00000b0a   00000b0a    r-- .const.2
    118136b4    118136b4    00000004   00000004    rw-
      118136b4    118136b4    00000004   00000004    rw- shared_data
    118136b8    118136b8    00000d44   00000d44    rw-
      118136b8    118136b8    00000d44   00000d44    rw- .fardata
    11814400    11814400    0000058c   0000058c    rw-
      11814400    11814400    0000058c   0000058c    rw- critical_config_fardata
    1181498c    1181498c    0000027c   0000027c    r--
      1181498c    1181498c    0000027c   0000027c    r-- .switch
    11814c08    11814c08    0000017d   0000017d    rw-
      11814c08    11814c08    0000017d   0000017d    rw- fast_data
    11814d88    11814d88    000000a4   000000a4    rw-
      11814d88    11814d88    0000009c   0000009c    rw- critical_kernel_fardata
      11814e24    11814e24    00000008   00000008    rw- .neardata
    11814e2c    11814e2c    00000044   00000044    r--
      11814e2c    11814e2c    00000044   00000044    r-- .rodata
    11814e70    11814e70    00000008   00000000    rw-
      11814e70    11814e70    00000008   00000000    rw- critical_kernel_farcode
    11815000    11815000    00000200   00000200    r-x
      11815000    11815000    00000200   00000200    r-x .vecs
    11f00000    11f00000    00001000   00000000    rw-
      11f00000    11f00000    00001000   00000000    rw- .stack
    c7f00000    c7f00000    0003a9dc   0003a9dc    rw-
      c7f00000    c7f00000    0003a9dc   0003a9dc    rw- slow_data
    c7f3a9e0    c7f3a9e0    0001a14c   0001a14c    r-x
      c7f3a9e0    c7f3a9e0    00010d60   00010d60    r-x .text
      c7f4b740    c7f4b740    000068a0   000068a0    r-x slow_code
      c7f51fe0    c7f51fe0    00002b4c   00002b4c    r-- .const:xdc_runtime_Text_charTab__A
    c7f54b30    c7f54b30    00001a18   00000000    rw-
      c7f54b30    c7f54b30    00001a18   00000000    rw- .far
    c7f56548    c7f56548    000007e4   000007e4    r--
      c7f56548    c7f56548    00000678   00000678    r-- .const:.string
      c7f56bc0    c7f56bc0    0000016c   0000016c    r-- .const:xdc_runtime_Text_nodeTab__A
    c7f56d30    c7f56d30    00000120   00000000    rw-
      c7f56d30    c7f56d30    00000120   00000000    rw- .cio
    c7f57000    c7f57000    0000008c   0000008c    r--
      c7f57000    c7f57000    0000008c   0000008c    r-- ti_sdo_ipc_init
    <cut>
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  • 0 in reply to Graham Bartlett
    TI__Genius 12865 points

    Hi Graham,

    Given you said you are using Notify only on a regular basis, then the key IPC function is NotifyDriverShm_isr() in packages/ti/sdo/ipc/notifyDrivers/NotifyDriverShm.c which is run in Hwi context on incoming Notify interrupts. That function internally calls the user-registered Notify callback function in your application, so you want to put that one in fast memory as well if you haven't already done so. It also calls some Cache* functions if you have cacheEnabled property set for SharedRegion 0 - so hopefully you have left it uncached to avoid the overhead. We generally recommend leaving SR0 uncached since it contains many small control data structures from IPC which do not benefit from caching. Finally NotifyDriverShm_isr() has calls to InterruptDsp_intClear() in packages/ti/sdo/ipc/family/da830/InterruptDsp.c and to ti_sdo_ipc_Notify_exec() in packages/ti/sdo/ipc/Notify.c, so those are other ones to put into fast memory.

    I am assuming you are turning off assertions in your production system, so I wouldn't worry about the Assert* calls.

    Note that due to the use of XDCTOOLS, the function names are mangled and their symbols appear with the full package path names in the map file. Nevertheless, if you search for the function names through the map file you should be able to identify the full section names for each function.

    Best regards,

    Vincent

  • 0 in reply to Vincent W.
    Intellectual 460 points

    That's great - thanks Vincent.  I wasn't aware that callbacks were run directly from the ISR, so that's definitely worth knowing.