Date: Thu, 3 Jun 2004 13:36:08 -0700 (PDT) From: Nate Lawson <nate@root.org> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-acpi@freebsd.org Subject: Re: Patch: Defer bus_config_intr() until bus_alloc_resource().. Message-ID: <20040603133254.N44646@root.org> In-Reply-To: <20040603.121143.08320551.imp@bsdimp.com> References: <20040602160338.T38138@root.org> <200406030917.36901.jhb@FreeBSD.org> <20040603.121143.08320551.imp@bsdimp.com>
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On Thu, 3 Jun 2004, M. Warner Losh wrote:
> In message: <20040603104616.I43856@root.org>
> Nate Lawson <nate@root.org> writes:
> : With hotplug, we're going to need ways for a separate routine to set
> : resource attributes before bus_alloc_resource() time. Plus, you yourself
> : are an advocate of a multi-pass probing approach that includes separating
> : resource reservation from allocation.
>
> I don't understand this comment at all. We already support two
> different hot-plug technologies that allocate resources out of memory,
> i/o and irq space. This is done by the bus that knows what resources
> the child needs before adding the child to the bus.
I don't have an example handy, but there are tables (SSDT) that can
appear/disappear with device insertion and it would be helpful to be able
to set up any resources described by them before device_attach() and alloc
time. I'm interested why bus_{get,set}_resource even exist if our plan
all along was to defer all resource parsing to alloc time.
-Nate
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