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Date:      Thu, 15 Sep 2022 08:37:55 +0000
From:      Lee MATTHEWS <Lee.MATTHEWS.external@stormshield.eu>
To:        "freebsd-drivers@freebsd.org" <freebsd-drivers@freebsd.org>
Subject:   Tracing userland calls through to a driver
Message-ID:  <484f6c4f5a2840daafaeda4943f22793@stormshield.eu>
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--_000_484f6c4f5a2840daafaeda4943f22793stormshieldeu_
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Hello,


I am trying to debug some GPIO issues on FreeBSD 10.3.  I'd like to know if=
 it is possible to know what process in userland (via a process id) has cal=
led a method in the driver.

So for example, in the driver, the functions are bound via DEVMETHOD like :


static device_method_t winbond_gpio_methods[] =3D {
    /* Device interface */
...
    DEVMETHOD(gpio_pin_set,            winbond_gpio_pin_set),
    DEVMETHOD(gpio_pin_get,            winbond_gpio_pin_get),
...
    DEVMETHOD_END
};


When the function winbond_gpio_pin_get() is called, how can I know what cal=
led this?


Thanks in advance.


Best wishes,

Lee Matthews



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<p>Hello,</p>
<p><br>
</p>
<p>I am trying to debug some GPIO issues on FreeBSD 10.3.&nbsp; I'd like to=
 know if it is possible to know what process in userland (via a process id)=
 has called a method in the driver.<br>
<br>
So for example, in the driver, the functions are bound via DEVMETHOD like :=
</p>
<p><br>
</p>
<p></p>
<div>static device_method_t winbond_gpio_methods[] =3D {<br>
&nbsp;&nbsp; &nbsp;/* Device interface */<br>
...<br>
&nbsp;&nbsp; &nbsp;DEVMETHOD(gpio_pin_set,&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &=
nbsp;&nbsp;&nbsp; &nbsp;winbond_gpio_pin_set),<br>
&nbsp;&nbsp; &nbsp;DEVMETHOD(gpio_pin_get,&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &=
nbsp;&nbsp;&nbsp; &nbsp;winbond_gpio_pin_get),<br>
...<br>
&nbsp;&nbsp; &nbsp;DEVMETHOD_END<br>
};</div>
<p></p>
<p><br>
</p>
<p>When the function <span>winbond_gpio_pin_get()</span> is called, how can=
 I know what called this?</p>
<p><br>
</p>
<p>Thanks in advance.</p>
<p><br>
</p>
<p>Best wishes,</p>
<p>Lee Matthews<br>
</p>
<p><br>
</p>
<p><br>
</p>
</div>
</body>
</html>

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