From: Bjorn Helgaas <bhelgaas@google.com>
To: Liviu Dudau <liviu@dudau.co.uk>
Cc: Liviu Dudau <Liviu.Dudau@arm.com>, Arnd Bergmann <arnd@arndb.de>,
Rob Herring <robh+dt@kernel.org>,
Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <Will.Deacon@arm.com>,
Russell King <linux@arm.linux.org.uk>,
linux-pci <linux-pci@vger.kernel.org>,
Linus Walleij <linus.walleij@linaro.org>,
Tanmay Inamdar <tinamdar@apm.com>,
Grant Likely <grant.likely@secretlab.ca>,
Sinan Kaya <okaya@codeaurora.org>,
Jingoo Han <jg1.han@samsung.com>,
Kukjin Kim <kgene.kim@samsung.com>,
Suravee Suthikulanit <suravee.suthikulpanit@amd.com>,
linux-arch <linux-arch@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Device Tree ML <devicetree@vger.kernel.org>,
LAKML <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v12 10/12] PCI: Assign unassigned bus resources in pci_scan_root_bus()
Date: Tue, 23 Sep 2014 19:41:35 -0600 [thread overview]
Message-ID: <CAErSpo5DR+TPYXBWGKRj9SRPjsbJ6kjZmAH1AXT12txEjGdZGQ@mail.gmail.com> (raw)
In-Reply-To: <20140924011851.GD32643@bart.dudau.co.uk>
On Tue, Sep 23, 2014 at 7:18 PM, Liviu Dudau <liviu@dudau.co.uk> wrote:
> 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@google.com>
>> Cc: Arnd Bergmann <arnd@arndb.de>
>> Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
>> Cc: Rob Herring <robh+dt@kernel.org>
>> Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.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?
I'm not opposed to it, but I have the same question as for setting up
the domain: how does pci_scan_root_bus() learn what to assign to
bus->msi? It currently only gets a "void *sysdata" so there's no
obvious place to put it there. You could add a pcibios interface to
retrieve it, I suppose, but I'm starting to get uncomfortable with
adding more of those because we have such a mess of them already.
Bjorn
> 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
>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>
> --
> -------------------
> .oooO
> ( )
> \ ( Oooo.
> \_) ( )
> ) /
> (_/
>
> One small step
> for me ...
>
next prev parent reply other threads:[~2014-09-24 1:41 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-23 19:01 [PATCH v12 00/12] Support for creating generic PCI host bridges from DT Liviu Dudau
2014-09-23 19:01 ` [PATCH v12 01/12] Fix ioport_map() for !CONFIG_GENERIC_IOMAP cases Liviu Dudau
2014-09-23 19:01 ` [PATCH v12 02/12] PCI: Introduce helper functions to deal with PCI I/O ranges Liviu Dudau
2014-09-23 19:01 ` [PATCH v12 03/12] ARM: Define PCI_IOBASE as the base of virtual PCI IO space Liviu Dudau
2014-09-23 19:01 ` [PATCH v12 04/12] PCI: OF: Move of_pci_range_to_resources() into address.c Liviu Dudau
2014-09-23 19:01 ` [PATCH v12 05/12] PCI: OF: Fix the conversion of IO ranges into IO resources Liviu Dudau
2014-09-24 0:22 ` Bjorn Helgaas
2014-09-24 1:12 ` Liviu Dudau
2014-09-24 1:16 ` Bjorn Helgaas
2014-09-24 9:20 ` Robert Richter
2014-09-24 10:14 ` Andrew Murray
2014-09-23 19:01 ` [PATCH v12 06/12] PCI: Create pci_host_bridge before its associated bus in pci_create_root_bus Liviu Dudau
2014-09-25 18:15 ` Yinghai Lu
2014-09-25 19:59 ` Bjorn Helgaas
2014-09-26 14:58 ` Liviu Dudau
2014-09-26 16:17 ` Bjorn Helgaas
2014-09-23 19:01 ` [PATCH v12 07/12] PCI: Introduce generic domain handling for PCI busses Liviu Dudau
2014-09-23 19:01 ` [PATCH v12 08/12] PCI: OF: Introduce helper function for retrieving PCI domain numbers Liviu Dudau
2014-09-26 18:20 ` Rob Herring
2014-09-26 21:20 ` liviu
2014-09-26 21:53 ` Rob Herring
2014-09-26 22:47 ` Liviu Dudau
2014-09-27 20:18 ` Bjorn Helgaas
2014-09-23 19:01 ` [PATCH v12 09/12] OF: PCI: Add support for parsing PCI host bridge resources from DT Liviu Dudau
2014-09-24 16:43 ` Liviu Dudau
2014-09-24 17:31 ` Bjorn Helgaas
2014-09-24 17:53 ` Liviu Dudau
2014-09-24 18:01 ` Will Deacon
2014-09-25 8:54 ` Liviu Dudau
2014-09-25 9:04 ` Will Deacon
2014-09-23 19:01 ` [PATCH v12 10/12] PCI: Assign unassigned bus resources in pci_scan_root_bus() Liviu Dudau
2014-09-24 1:18 ` Liviu Dudau
2014-09-24 1:41 ` Bjorn Helgaas [this message]
2014-09-24 1:48 ` Liviu Dudau
2014-09-28 21:16 ` Suravee Suthikulpanit
2014-09-29 18:18 ` Arnd Bergmann
2014-09-23 19:01 ` [PATCH v12 11/12] PCI: Introduce pci_remap_iospace() for remapping PCI I/O bus resources into CPU space Liviu Dudau
2014-09-23 19:01 ` [PATCH v12 12/12] arm64: Add architectural support for PCIe Liviu Dudau
2014-09-23 21:54 ` [PATCH v12 00/12] Support for creating generic PCI host bridges from DT Bjorn Helgaas
2014-09-23 22:48 ` Liviu Dudau
2014-09-23 23:00 ` Bjorn Helgaas
2014-09-24 13:30 ` Rob Herring
2014-09-24 14:23 ` Liviu Dudau
2014-09-24 15:38 ` Bjorn Helgaas
2014-09-23 22:49 ` Liviu Dudau
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