linux-kernel - Re: [PATCH 2/4] Intel iommu: Speed up processing of the identity

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Message-ID: <4D938488.7010607@sgi.com>
Date:	Wed, 30 Mar 2011 12:29:12 -0700
From:	Mike Travis <travis@....com>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org,
	Mike Habeck <habeck@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] Intel iommu: Speed up processing of the identity_mapping
 function



Chris Wright wrote:
> * Mike Travis (travis@....com) wrote:
>> @@ -2138,6 +2134,7 @@ static int domain_add_dev_info(struct dm
>>  	list_add(&info->global, &device_domain_list);
>>  	pdev->dev.archdata.iommu = info;
> 
> The si_domain is cached right here...can you not use this instead of
> adding an iommu impl. specific bit to pci_dev?
> 
>>  	spin_unlock_irqrestore(&device_domain_lock, flags);
>> +	pdev->is_identity_mapped = (domain == si_domain);

Yes, it looks like I came at the solution backwards... I added
the bit then figured out how to set it.  I'll update that patch.
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