linux-kernel - Re: [PATCH v12 10/12] PCI: Assign unassigned bus resources in pci_scan_root

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Date:	Wed, 24 Sep 2014 02:18:51 +0100
From:	Liviu Dudau <liviu@...au.co.uk>
To:	Liviu Dudau <Liviu.Dudau@....com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
	Rob Herring <robh+dt@...nel.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	linux-pci <linux-pci@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Tanmay Inamdar <tinamdar@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Sinan Kaya <okaya@...eaurora.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Suravee Suthikulanit <suravee.suthikulpanit@....com>,
	linux-arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Device Tree ML <devicetree@...r.kernel.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v12 10/12] PCI: Assign unassigned bus resources in
 pci_scan_root_bus()

On Tue, Sep 23, 2014 at 08:01:12PM +0100, Liviu Dudau wrote:
> If the firmware has not assigned all the bus resources and
> we are not just probing the PCIe busses, it makes sense to
> assign the unassigned resources in pci_scan_root_bus().
> 
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> ---
>  drivers/pci/probe.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index ef891d2..508cf61 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1953,6 +1953,9 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
>  	if (!found)
>  		pci_bus_update_busn_res_end(b, max);
>  
> +	if (!pci_has_flag(PCI_PROBE_ONLY))
> +		pci_assign_unassigned_bus_resources(b);
> +
>  	pci_bus_add_devices(b);
>  	return b;
>  }
> -- 
> 2.1.0
> 

Bjorn,

If you are OK with this patch, can you let me know how do you feel about
making pci_scan_root_bus() set up the bus->msi pointer as well?

Side note: I don't know exactly how to do it now, but setting bus->msi is
needed by platforms that are based on my patches and want to use MSI,
otherwise they have to open code pci_scan_root_bus() to set it. I haven't
made any attempts to do it in this series as the GICv2m patches are not
ready yet, but I can see the need arriving soon.

Best regards,
Liviu

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