linux-kernel - Re: [PATCH V3 2/6] acpi: pci: Setup MSI domain for ACPI based pci devices

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Date:	Sat, 21 Nov 2015 15:18:45 -0600
From:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:	Marc Zyngier <marc.zyngier@....com>
CC:	<tglx@...utronix.de>, <jason@...edaemon.net>, <rjw@...ysocki.net>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	<hanjun.guo@...aro.org>, <tomasz.nowicki@...aro.org>,
	<graeme.gregory@...aro.org>, <dhdang@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH V3 2/6] acpi: pci: Setup MSI domain for ACPI based pci
 devices

Hi Marc,

On 11/19/15 06:08, Marc Zyngier wrote:
> On Wed, 21 Oct 2015 11:47:25 -0700
> Suravee Suthikulpanit <Suravee.Suthikulpanit@....com> wrote:
>
> Hi Suravee,
>
> Sorry it took so long to get to this series. Comments below.

No worry.

>
>> This patch introduces pci_host_bridge_acpi_msi_domain(), which returns
>> the MSI domain of the specified PCI host bridge with DOMAIN_BUS_PCI_MSI
>> bus token. Then, it is assigned to pci device.
>>
>> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>> ---
>>   drivers/pci/pci-acpi.c | 13 +++++++++++++
>>   drivers/pci/probe.c    |  2 ++
>>   include/linux/pci.h    |  7 +++++++
>>   3 files changed, 22 insertions(+)
>>
>> diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
>> index a32ba75..0e21ef4 100644
>> --- a/drivers/pci/pci-acpi.c
>> +++ b/drivers/pci/pci-acpi.c
>> @@ -9,7 +9,9 @@
>>
>>   #include <linux/delay.h>
>>   #include <linux/init.h>
>> +#include <linux/irqdomain.h>
>>   #include <linux/pci.h>
>> +#include <linux/msi.h>
>>   #include <linux/pci_hotplug.h>
>>   #include <linux/module.h>
>>   #include <linux/pci-aspm.h>
>> @@ -689,6 +691,17 @@ static struct acpi_bus_type acpi_pci_bus = {
>>   	.cleanup = pci_acpi_cleanup,
>>   };
>>
>> +struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
>> +{
>> +	struct irq_domain *dom = NULL;
>> +	struct fwnode_handle *fwnode = pci_msi_get_fwnode(&bus->dev);
>> +
>> +	if (fwnode)
>> +		dom = irq_find_matching_fwnode(fwnode,
>> +					       DOMAIN_BUS_PCI_MSI);
>> +	return dom;
>> +}
>> +
>
> Given this, I really question the need for what you define in patch #1
> to be standalone. It is only used by ACPI (DT has its own private
> helpers), and it is so far unlikely that it will be of any use for
> other firmware interfaces.
>
> My suggestion is to get rid of pci_msi_get_fwnode() and move the
> registration helper into this file. That'd be much simpler.
>
> Thanks,
>
> 	M.
>

Ok, I'll take care of this. I assume the rest of the patches looks ok.

Thanks,
Suravee
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