linux-kernel - Re: [Patch Part3 V5 5/8] iommu/vt-d: Enhance intel_irq_remapping driver to support DMAR unit hotplug

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Date:	Tue, 16 Sep 2014 15:00:29 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Yijing Wang <wangyijing@...wei.com>,
	Joerg Roedel <joro@...tes.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
CC:	Ashok Raj <ashok.raj@...el.com>, Tony Luck <tony.luck@...el.com>,
	iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org
Subject: Re: [Patch Part3 V5 5/8] iommu/vt-d: Enhance intel_irq_remapping
 driver to support DMAR unit hotplug

On 2014/9/15 10:20, Yijing Wang wrote:
>> +static void ir_remove_ioapic_hpet_scope(struct intel_iommu *iommu)
>> +{
>> +	int i;
>>  
>> -			ir_parse_one_hpet_scope(scope, iommu);
>> -		}
>> -		start += scope->length;
>> -	}
>> +	for (i = 0; i < MAX_HPET_TBS; i++)
>> +		if (ir_hpet[i].iommu == iommu)
>> +			ir_hpet[i].iommu = NULL;
> 
> Hi Gerry, why not reset whole ir_hpe and ir_ioapic data struct?
Hi Yijing,
	Thanks for review. Zero is legal for id, bus and devfn in
struct ioapic_scope and struct hpet_scope. So we use domain field
as a flag to mark entry valid or invalid and only reset iommu field.

Regards!
Gerry
> 
> 
> 
>>  
>> -	return 0;
>> +	for (i = 0; i < MAX_IO_APICS; i++)
>> +		if (ir_ioapic[i].iommu == iommu)
>> +			ir_ioapic[i].iommu = NULL;
>>  }
>>  
> 
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