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).
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).
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).