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Determing if a driver and system are using MSI

Don_Burn_1Don_Burn_1 Member Posts: 4,311
Since MSI was brought up today, is there any easy way to determine if a
dirver/board/system combination is using MSI? I have a client who needs
to determine this, preferably from user space, worst case from the
debugger (but they do not have the driver source).


Don Burn (MVP, Windows DKD)
Windows Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr

Comments

  • mmmm Member - All Emails Posts: 1,409
    I think that you could look at the
    InterruptManagement\MessageSignaledInterruptProperties subkey of the
    device's hardware key for "MSISupported==1" (probably != 0).


    mm

    -----Original Message-----
    From: xxxxx@lists.osr.com
    [mailto:xxxxx@lists.osr.com] On Behalf Of Don Burn
    Sent: Friday, January 28, 2011 5:26 PM
    To: Windows System Software Devs Interest List
    Subject: [ntdev] Determing if a driver and system are using MSI

    Since MSI was brought up today, is there any easy way to determine if a
    dirver/board/system combination is using MSI? I have a client who needs
    to determine this, preferably from user space, worst case from the
    debugger (but they do not have the driver source).


    Don Burn (MVP, Windows DKD)
    Windows Filesystem and Driver Consulting
    Website: http://www.windrvr.com
    Blog: http://msmvps.com/blogs/WinDrvr





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  • Jake_OshinsJake_Oshins Member Posts: 1,058
    Sure Don. If I understand your question correctly, you can look at the
    device's assigned resources. If the IRQ is negative when interpreted as a
    32-bit signed integer, then the device is using MSI (or MSI-X or home-rolled
    MSI without the config struct.)



    Jake Oshins
    Hyper-V I/O Architect
    Windows Kernel Group

    This post implies no warranties and confers no rights.

    --------------------------------------------------------------
    "Don Burn" wrote in message news:xxxxx@ntdev...

    Since MSI was brought up today, is there any easy way to determine if a
    dirver/board/system combination is using MSI? I have a client who needs
    to determine this, preferably from user space, worst case from the
    debugger (but they do not have the driver source).


    Don Burn (MVP, Windows DKD)
    Windows Filesystem and Driver Consulting
    Website: http://www.windrvr.com
    Blog: http://msmvps.com/blogs/WinDrvr
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