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Question about whql

Hi Experts

My question is about purpose of whql.

Suppose I have a filter driver which based on some inputs from user mode performs filtering.

We can think of user mode as full software suite.

So is the purpose of whql to test full functionality of driver with fully functional user mode.

i.e while doing whql is the fully functional product needs to be installed?

Or can I just test the driver like for loading/unloading etc.

The reason for question is that like many commercial softwares our software can run under various configurations and scenarios.

So does it mean that each whql test be subjected to this vast configuration and functionality tests.

Documentation is not very much clear on that.

Any comments/discussions etc is welcome.

Thanks again for help

Comments

  • Tim_RobertsTim_Roberts Posts: 12,622
    xxxxx@hotmail.com wrote:
    > My question is about purpose of whql.

    The purpose of WHQL, essentially, is to give Microsoft some level of
    assurance that the drivers being installed on their customer's systems
    are not total garbage.  When a third-party driver causes Windows to
    crash, consumers blame Microsoft.  They don't understand the fineries of
    third parties and outside drivers.  All they know is that Windows
    crashed.  Microsoft got tired of being blamed for that.

    In the late 1990s, Windows started sending a summary of every blue
    screen to Redmond for statistical analysis.  They were getting tens of
    thousands of these every day, and it turned out more than 30% were
    caused by graphics drivers.  That's caused a revolution in graphics
    drivers, and things are much better now.  Even if your graphics driver
    does crash, Windows can now restart it without impacting the Windows
    session.

     
    > Suppose I have a filter driver which based on some inputs from user mode performs filtering.
    > We can think of user mode as full software suite.
    > So is the purpose of whql to test full functionality of driver with fully functional user mode.
    > i.e while doing whql is the fully functional product needs to be installed?

    No.  Remember, YOU don't decide how to test it.  The HCK/HLK kit will
    control the testing.  Based on your driver type, it will choose the set
    of tests to run.  For some classes, that means a basic set of tests for
    driver integrity (loading, unloading, PnP handling, random IRP
    rejection, following the IRP rules) and power management checks (do you
    survive sleep/restore, do you survive hibernate/restore).  For some
    classes, it means a wide range of functionality tests, but they're all
    canned tests.  You don't have to be running any of your software.

    Now, when you create your WHQL account, you sign a document that says
    you have done your own extensive testing of the driver in real-world
    operational circumstances, so you do have some liability if your driver
    falls flat on its face in actual use, but WHQL can't test that.

     
    > Or can I just test the driver like for loading/unloading etc.

    YOU don't decide this.  The HCK/HLK controller decides this.


    > The reason for question is that like many commercial softwares our software can run under various configurations and scenarios.
    > So does it mean that each whql test be subjected to this vast configuration and functionality tests.

    How would they do that?  Remember, they need test results that can be
    scanned and judged automatically.  No, for WHQL, they don't care about
    your software.  All you are testing is the driver.


    > Documentation is not very much clear on that.

    Well, I think it's there, but you probably have to go through it once to
    figure this out.

    --
    Tim Roberts, xxxxx@probo.com
    Providenza & Boekelheide, Inc.

    Tim Roberts, [email protected]
    Providenza & Boekelheide, Inc.

  • Thanks a lot Tim.
    It really helped.
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