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SubjectRe: [PATCH v10 06/12] iommu/vt-d: Add SVA domain support
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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@linux.intel.com>
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> Tested-by: Tony Zhu <tony.zhu@intel.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@intel.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

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