Date: Wed, 15 Jul 2009 07:18:41 +0000 From: Norbert Koch <nkoch@demig.de> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: bus device driver Message-ID: <4A5D82D1.8030608@demig.de> In-Reply-To: <200907141151.29971.jhb@freebsd.org> References: <4A5B3F1B.3040207@demig.de> <200907140849.51702.jhb@freebsd.org> <4A5CA4AA.6050307@demig.de> <200907141151.29971.jhb@freebsd.org>
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> No. First of all, the PCI bus driver will only allocate resources for direct > children. It simply passes requests up the tree for grandchildren (this is > how ISA devices behind a PCI-ISA bridge request resources). In this case, > you will want to allocate resources for your BAR and your interrupt using > bus_alloc_resource() during your attach routine. You can then either share > the resources directly with your children by returning your resource values > in your own bus_alloc_resource() method (see ppc(4) for an example of this) > or subdivide your resource to make new resources (the easiest way to do this > is probably to create a rman from your resource and then use > rman_reserve_resource() to sub-allocate chunks of that to your children). > For the interrupt resource you can just return your own resource pointer > directly in your bus_alloc_resource() routine. > > Ok, that makes things a bit clearer. Thank you for your help!
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