linux-kernel - Re: [PATCH v7 04/11] iommu/vt-d: Replace Intel specific PASID allocator with IOASID

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Message-ID: <87bb4356-136b-b395-894e-8cffa1709309@linux.intel.com>
Date:   Fri, 25 Oct 2019 13:47:25 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc:     baolu.lu@...ux.intel.com, Yi Liu <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Eric Auger <eric.auger@...hat.com>
Subject: Re: [PATCH v7 04/11] iommu/vt-d: Replace Intel specific PASID
 allocator with IOASID

Hi,

On 10/25/19 3:54 AM, Jacob Pan wrote:
> Make use of generic IOASID code to manage PASID allocation,
> free, and lookup. Replace Intel specific code.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>   drivers/iommu/intel-iommu.c | 12 ++++++------
>   drivers/iommu/intel-pasid.c | 36 ------------------------------------
>   drivers/iommu/intel-svm.c   | 39 +++++++++++++++++++++++----------------
>   3 files changed, 29 insertions(+), 58 deletions(-)

[--cut--]

> @@ -458,10 +465,11 @@ int intel_svm_is_pasid_valid(struct device *dev, int pasid)
>   	if (!iommu)
>   		goto out;
>   
> -	svm = intel_pasid_lookup_id(pasid);
> -	if (!svm)
> +	svm = ioasid_find(NULL, pasid, NULL);
> +	if (IS_ERR(svm)) {

Shall we check whether svm is NULL?

Others looks good to me.

Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>

Best regards,
baolu