linux-kernel - Re: [PATCH v10 06/12] iommu/vt-d: Add SVA domain support

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Date:   Sun, 31 Jul 2022 20:20:36 +0800
From:   Yi Liu <yi.l.liu@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>
CC:     Eric Auger <eric.auger@...hat.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        Zhu Tony <tony.zhu@...el.com>, <iommu@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v10 06/12] iommu/vt-d: Add SVA domain support

On 2022/7/5 13:07, Lu Baolu wrote:
> Add support for SVA domain allocation and provide an SVA-specific
> iommu_domain_ops.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>
> Tested-by: Tony Zhu <tony.zhu@...el.com>
> ---
>   include/linux/intel-iommu.h |  5 ++++
>   drivers/iommu/intel/iommu.c |  2 ++
>   drivers/iommu/intel/svm.c   | 49 +++++++++++++++++++++++++++++++++++++
>   3 files changed, 56 insertions(+)

Reviewed-by: Yi Liu <yi.l.liu@...el.com>

> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> index 31e3edc0fc7e..9007428a68f1 100644
> --- a/include/linux/intel-iommu.h
> +++ b/include/linux/intel-iommu.h
> @@ -743,6 +743,7 @@ void intel_svm_unbind(struct iommu_sva *handle);
>   u32 intel_svm_get_pasid(struct iommu_sva *handle);
>   int intel_svm_page_response(struct device *dev, struct iommu_fault_event *evt,
>   			    struct iommu_page_response *msg);
> +struct iommu_domain *intel_svm_domain_alloc(void);
>   
>   struct intel_svm_dev {
>   	struct list_head list;
> @@ -768,6 +769,10 @@ struct intel_svm {
>   };
>   #else
>   static inline void intel_svm_check(struct intel_iommu *iommu) {}
> +static inline struct iommu_domain *intel_svm_domain_alloc(void)
> +{
> +	return NULL;
> +}
>   #endif
>   
>   #ifdef CONFIG_INTEL_IOMMU_DEBUGFS
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 44016594831d..993a1ce509a8 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -4298,6 +4298,8 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
>   		return domain;
>   	case IOMMU_DOMAIN_IDENTITY:
>   		return &si_domain->domain;
> +	case IOMMU_DOMAIN_SVA:
> +		return intel_svm_domain_alloc();
>   	default:
>   		return NULL;
>   	}
> diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
> index d04880a291c3..7d4f9d173013 100644
> --- a/drivers/iommu/intel/svm.c
> +++ b/drivers/iommu/intel/svm.c
> @@ -931,3 +931,52 @@ int intel_svm_page_response(struct device *dev,
>   	mutex_unlock(&pasid_mutex);
>   	return ret;
>   }
> +
> +static int intel_svm_set_dev_pasid(struct iommu_domain *domain,
> +				   struct device *dev, ioasid_t pasid)
> +{
> +	struct device_domain_info *info = dev_iommu_priv_get(dev);
> +	struct intel_iommu *iommu = info->iommu;
> +	struct mm_struct *mm = domain->mm;
> +	struct iommu_sva *sva;
> +	int ret = 0;
> +
> +	mutex_lock(&pasid_mutex);
> +	sva = intel_svm_bind_mm(iommu, dev, mm);
> +	if (IS_ERR(sva))
> +		ret = PTR_ERR(sva);
> +	mutex_unlock(&pasid_mutex);
> +
> +	return ret;
> +}
> +
> +static void intel_svm_block_dev_pasid(struct iommu_domain *domain,
> +				      struct device *dev, ioasid_t pasid)
> +{
> +	mutex_lock(&pasid_mutex);
> +	intel_svm_unbind_mm(dev, pasid);
> +	mutex_unlock(&pasid_mutex);
> +}
> +
> +static void intel_svm_domain_free(struct iommu_domain *domain)
> +{
> +	kfree(to_dmar_domain(domain));
> +}
> +
> +static const struct iommu_domain_ops intel_svm_domain_ops = {
> +	.set_dev_pasid		= intel_svm_set_dev_pasid,
> +	.block_dev_pasid	= intel_svm_block_dev_pasid,
> +	.free			= intel_svm_domain_free,
> +};
> +
> +struct iommu_domain *intel_svm_domain_alloc(void)
> +{
> +	struct dmar_domain *domain;
> +
> +	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
> +	if (!domain)
> +		return NULL;
> +	domain->domain.ops = &intel_svm_domain_ops;
> +
> +	return &domain->domain;
> +}

-- 
Regards,
Yi Liu