Hi.

Is there a way to get a DEVIE_OBJECT pointer of a device which is handled by
a driver that is not mine ?

my driver (WDF based) handles few devices that exist on one PCI card. The
pci-2-pci bridge device on that board(card) is handled by the pci.sys driver.
so my question is - can i get a handle to that bridge's DEVICE_OBJECT ?
the reason for i want this can be for reading PCI location info of the bridge
for example.

thanks,
Kobi.

if the bridge is one level up in the pnp hierarchy the answer is no, there
is no way for you to get this parent devobj

d

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"kobi n" <kobin@discussions.microsoft.com> wrote in message
news:A30A7EBB-4569-48E8-A4B7-FC38E45F87EF@microsoft.com...

Hi,
thanks a lot for the answer.

i want to be sure - when you say "one level up in the pnp hierarchy" you
refer to the level(number) of the the bus which the bridge is attached to ?

( just want to be sure that i'm alligned with the terminology or maybe i'm
missing something here)

thanks again,
Kobi

"Doron Holan [MSFT]" wrote:

Hi again.

i would like to extend my question :

as described, i have a board which contains several pci devices. some of
them (a DSP for example) are handled by my driver. the pci-to-pci bridge
however is handled by the pci.sys.

now, i would like to perform a read(even write) to the bridge. in the past
we could ude the HalSet/GetBusData routines. today these are obsolete and
the alternative is using one of the two :

1. IRP_MN_READ/WRITE_CONFIG
2. IRP_MN_QUERY_INTERFACE

now i get to my problem. with both cases i need to supply a DEVIE_OBJECT
for the irp creation. i do not understand if this DEVICE_OBJECT should be,
in my case, the BRIDGE's devie object. since i cannot get this device object
as described in your previous answer, does it mean that i actually can't
perform read/write to the pci bridge ?

if i use IRP_MN_QUERY_INTERFACE, does the DEVICE_OBJECT i supply for the IRP
creation must be the bridge's one or maybe i'm missing something here and
should supply a DEVIE_OBJECT of my DSP for example and then get some kind of
interface to the pci driver and from there somehow get to the pci bridge ?

is using IRP_MN_QUERY_INTERFACE give me an interface to a specified device
(the bridge) or to the pci driver ?

thanks a lot,
Kobi.



"kobi n" wrote: