linux-kernel - Re: [PATCH v9 06/11] arm-smmu-v3/sva: Add SVA domain support

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Date:   Mon, 27 Jun 2022 19:50:38 +0800
From:   Zhangfei Gao <zhangfei.gao@...aro.org>
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:     Jean-Philippe Brucker <jean-philippe@...aro.org>,
        iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org,
        Jacob jun Pan <jacob.jun.pan@...el.com>
Subject: Re: [PATCH v9 06/11] arm-smmu-v3/sva: Add SVA domain support



On 2022/6/21 下午10:43, 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: Jean-Philippe Brucker <jean-philippe@...aro.org>

Tested-by: Zhangfei Gao <zhangfei.gao@...aro.org>
Have tested the series on aarch64.

Thanks

> ---
>   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  6 ++
>   .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   | 69 +++++++++++++++++++
>   drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   |  3 +
>   3 files changed, 78 insertions(+)
>
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> index d2ba86470c42..96399dd3a67a 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> @@ -758,6 +758,7 @@ struct iommu_sva *arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm);
>   void arm_smmu_sva_unbind(struct iommu_sva *handle);
>   u32 arm_smmu_sva_get_pasid(struct iommu_sva *handle);
>   void arm_smmu_sva_notifier_synchronize(void);
> +struct iommu_domain *arm_smmu_sva_domain_alloc(void);
>   #else /* CONFIG_ARM_SMMU_V3_SVA */
>   static inline bool arm_smmu_sva_supported(struct arm_smmu_device *smmu)
>   {
> @@ -803,5 +804,10 @@ static inline u32 arm_smmu_sva_get_pasid(struct iommu_sva *handle)
>   }
>   
>   static inline void arm_smmu_sva_notifier_synchronize(void) {}
> +
> +static inline struct iommu_domain *arm_smmu_sva_domain_alloc(void)
> +{
> +	return NULL;
> +}
>   #endif /* CONFIG_ARM_SMMU_V3_SVA */
>   #endif /* _ARM_SMMU_V3_H */
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> index f155d406c5d5..fc4555dac5b4 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> @@ -549,3 +549,72 @@ void arm_smmu_sva_notifier_synchronize(void)
>   	 */
>   	mmu_notifier_synchronize();
>   }
> +
> +static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
> +				      struct device *dev, ioasid_t id)
> +{
> +	int ret = 0;
> +	struct mm_struct *mm;
> +	struct iommu_sva *handle;
> +
> +	if (domain->type != IOMMU_DOMAIN_SVA)
> +		return -EINVAL;
> +
> +	mm = domain->mm;
> +	if (WARN_ON(!mm))
> +		return -ENODEV;
> +
> +	mutex_lock(&sva_lock);
> +	handle = __arm_smmu_sva_bind(dev, mm);
> +	if (IS_ERR(handle))
> +		ret = PTR_ERR(handle);
> +	mutex_unlock(&sva_lock);
> +
> +	return ret;
> +}
> +
> +static void arm_smmu_sva_block_dev_pasid(struct iommu_domain *domain,
> +					 struct device *dev, ioasid_t id)
> +{
> +	struct mm_struct *mm = domain->mm;
> +	struct arm_smmu_bond *bond = NULL, *t;
> +	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
> +
> +	mutex_lock(&sva_lock);
> +	list_for_each_entry(t, &master->bonds, list) {
> +		if (t->mm == mm) {
> +			bond = t;
> +			break;
> +		}
> +	}
> +
> +	if (!WARN_ON(!bond) && refcount_dec_and_test(&bond->refs)) {
> +		list_del(&bond->list);
> +		arm_smmu_mmu_notifier_put(bond->smmu_mn);
> +		kfree(bond);
> +	}
> +	mutex_unlock(&sva_lock);
> +}
> +
> +static void arm_smmu_sva_domain_free(struct iommu_domain *domain)
> +{
> +	kfree(domain);
> +}
> +
> +static const struct iommu_domain_ops arm_smmu_sva_domain_ops = {
> +	.set_dev_pasid		= arm_smmu_sva_set_dev_pasid,
> +	.block_dev_pasid	= arm_smmu_sva_block_dev_pasid,
> +	.free			= arm_smmu_sva_domain_free,
> +};
> +
> +struct iommu_domain *arm_smmu_sva_domain_alloc(void)
> +{
> +	struct iommu_domain *domain;
> +
> +	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
> +	if (!domain)
> +		return NULL;
> +	domain->ops = &arm_smmu_sva_domain_ops;
> +
> +	return domain;
> +}
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index ae8ec8df47c1..a30b252e2f95 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -1999,6 +1999,9 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
>   {
>   	struct arm_smmu_domain *smmu_domain;
>   
> +	if (type == IOMMU_DOMAIN_SVA)
> +		return arm_smmu_sva_domain_alloc();
> +
>   	if (type != IOMMU_DOMAIN_UNMANAGED &&
>   	    type != IOMMU_DOMAIN_DMA &&
>   	    type != IOMMU_DOMAIN_DMA_FQ &&