linux-kernel - Question about allocating resources for a hotplug device

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Message-ID: <339187.36838.qm@web63901.mail.re1.yahoo.com>
Date:	Thu, 6 Nov 2008 11:18:17 -0800 (PST)
From:	arvind vasudev <arvind_vasudev2000@...oo.com>
To:	linux-kernel@...r.kernel.org, jbarnes@...tuousgeek.org
Subject: Question about allocating resources for a hotplug device

Increasing the scope to include more people.

Thanks,
Arvind.

--- On Wed, 11/5/08, arvind vasudev <arvind_vasudev2000@...oo.com> wrote:

> From: arvind vasudev <arvind_vasudev2000@...oo.com>
> Subject: Question about allocating resources for a hotplug device
> To: linux-pci@...r.kernel.org
> Date: Wednesday, November 5, 2008, 11:43 AM
> Hello,
> 
> I am not sure if this is the right place to ask this
> question, so please let me know if there is another list
> that I should post this on.
> 
> The question is that I am hotpluging a bridge in a slot,
> and plugging in a device behind the bridge. When I do this,
> I can see that the kernel enumerates the bridge and the
> device (assigns bus and device numbers to them), but it
> fails to allocate the memory resource that the new device is
> requesting for 1MB. After tracing the kernel code (version
> 2.6.23), I can see that call to pci_bus_assign_resources()
> fails. In the normal initialization sequence, it appears as
> though the BAR registers of a device have to be initialized
> before the call to pci_bus_assign_resources(), possibly by
> the BIOS.
> 
> How should the BAR registers of the new device be
> initialized in the case of hotplug?
> 
> Thanks,
> Arvind.
> 
> 
> 
>       
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