linux-kernel - Re: [PATCH v4 04/19] PCI/MSI: Add hooks to populate the msi

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Date:	Wed, 22 Jul 2015 09:48:06 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Ma Jun <majun258@...wei.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Duc Dang <dhdang@....com>
Subject: Re: [PATCH v4 04/19] PCI/MSI: Add hooks to populate the msi_domain field

On Wed, Jul 22, 2015 at 9:42 AM, Marc Zyngier <marc.zyngier@....com> wrote:
> Hi Bjorn,
>
> On 21/07/15 22:26, Bjorn Helgaas wrote:
>> On Wed, Jul 15, 2015 at 01:16:38PM +0100, Marc Zyngier wrote:
>>> In order to be able to populate the device msi_domain field,
>>> add the necesary hooks to propagate the host bridge msi_domain
>>> across secondary busses to devices.
>>>
>>> So far, nobody populates the initial msi_domain.
>>>
>>> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
>>> ---
>>>  drivers/pci/probe.c | 30 ++++++++++++++++++++++++++++++
>>>  include/linux/pci.h |  1 +
>>>  2 files changed, 31 insertions(+)
>>>
>>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>>> index cefd636..376f6fa 100644
>>> --- a/drivers/pci/probe.c
>>> +++ b/drivers/pci/probe.c
>>> @@ -661,6 +661,20 @@ static void pci_set_bus_speed(struct pci_bus *bus)
>>>      }
>>>  }
>>>
>>> +void __weak pcibios_set_host_bridge_msi_domain(struct pci_bus *bus)
>>> +{
>>> +}
>>
>> I don't think there's anything in this series that requires this to be a
>> weak function, is there?  This is the only definition I see.
>
> It looks like all the pcibios_* functions so far have a weak attribute,
> and I've added it as a matter of consistency.

We've used pcibios_* names where we might need an arch-specific
implementation.  I'm not sure that's the case here -- do you envision
an implementation under arch/* someday?  If not, maybe it should just
be a pci_* function instead of pcibios_*.

Bjorn
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