James C. McPherson schrieb:
> Baolu Lu wrote:
>> Hi,
>>
>> I am going to write a kernel component, which will interact with the
>> kernel PCI subsystem. This part of code will call the PCI interface to
>>
>> 1. traverse the pci device tree
>> 2. locate seg,bus,dev,fn
>> 3. locate parent p2p bridge
>>
>> Any reference for this?
>
> Writing Device Drivers, publication 819-3196 on docs.sun.com
The problem with the public DDI interface for walking the (PCI) device
tree is that, starting from your own dev_info_t, you can only go up
using ddi_get_parent(). All other related functions
(ddi_get_{sibbling,child}()) are not part of the public DDI interface
according to the man pages.
What is the rational behind this? My specific problem is that I would
like the type (device ID) of the hostbridge behind which my device is
operating. I can not detect it using ddi_get_parent() alone; I would
need to look sideways in the tree at some point (near the root).
Joachim
--
Joachim Worringen, Software Architect, Dolphin Interconnect Solutions
phone ++49/(0)228/324 08 17 - http://www.dolphinics.com
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