From mboxrd@z Thu Jan  1 00:00:00 1970
From: david.vrabel@citrix.com (David Vrabel)
Date: Wed, 10 Sep 2014 13:38:25 +0100
Subject: [Xen-devel] [PATCH v1 08/21] x86/xen/MSI: Use MSI chip framework
 to configure MSI/MSI-X irq
In-Reply-To: <540E6095.8030409@huawei.com>
References: <1409911806-10519-1-git-send-email-wangyijing@huawei.com>	<1409911806-10519-9-git-send-email-wangyijing@huawei.com>	<5409C8C0.8020200@citrix.com>
 <540E6095.8030409@huawei.com>
Message-ID: <54104641.7020007@citrix.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On 09/09/14 03:06, Yijing Wang wrote:
> On 2014/9/5 22:29, David Vrabel wrote:
>> On 05/09/14 11:09, Yijing Wang wrote:
>>> Use MSI chip framework instead of arch MSI functions to configure
>>> MSI/MSI-X irq. So we can manage MSI/MSI-X irq in a unified framework.
>> [...]
>>> --- a/arch/x86/pci/xen.c
>>> +++ b/arch/x86/pci/xen.c
>> [...]
>>> @@ -418,9 +430,9 @@ int __init pci_xen_init(void)
>>>  #endif
>>>  
>>>  #ifdef CONFIG_PCI_MSI
>>> -	x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
>>> -	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
>>> -	x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
>>> +	xen_msi_chip.setup_irqs = xen_setup_msi_irqs;
>>> +	xen_msi_chip.teardown_irqs = xen_teardown_msi_irqs;
>>> +	x86_msi_chip = &xen_msi_chip;
>>>  	msi_chip.irq_mask = xen_nop_msi_mask;
>>>  	msi_chip.irq_unmask = xen_nop_msi_mask;
>>
>> Why have these not been changed to set the x86_msi_chip.mask/unmask
>> fields instead?
> 
> Hi David, x86_msi_chip here is struct msi_chip data type, used to configure MSI/MSI-X
> irq. msi_chip above is struct irq_chip data type, represent the MSI irq controller. They are
> not the same object. Their name easily confusing people.

Ok, it all makes sense now.

Acked-by: David Vrabel <david.vrabel@citrix.com>

David