Re: [PATCH v10 04/10] iommu/vt-d: Support IOMMU_DEV_FEAT_IOPF

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Hi Jean,

On 1/21/21 8:36 PM, Jean-Philippe Brucker wrote:
Allow drivers to query and enable IOMMU_DEV_FEAT_IOPF, which amounts to
checking whether PRI is enabled.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>

Reviewed-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

Best regards,
baolu

---
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
  drivers/iommu/intel/iommu.c | 11 ++++++++---
  1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index f665322a0991..c777bd94df5d 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -5330,6 +5330,8 @@ static int siov_find_pci_dvsec(struct pci_dev *pdev)
  static bool
  intel_iommu_dev_has_feat(struct device *dev, enum iommu_dev_features feat)
  {
+	struct device_domain_info *info = get_domain_info(dev);
+
  	if (feat == IOMMU_DEV_FEAT_AUX) {
  		int ret;
@@ -5344,13 +5346,13 @@ intel_iommu_dev_has_feat(struct device *dev, enum iommu_dev_features feat)
  		return !!siov_find_pci_dvsec(to_pci_dev(dev));
  	}
- if (feat == IOMMU_DEV_FEAT_SVA) {
-		struct device_domain_info *info = get_domain_info(dev);
+	if (feat == IOMMU_DEV_FEAT_IOPF)
+		return info && info->pri_supported;
+ if (feat == IOMMU_DEV_FEAT_SVA)
  		return info && (info->iommu->flags & VTD_FLAG_SVM_CAPABLE) &&
  			info->pasid_supported && info->pri_supported &&
  			info->ats_supported;
-	}
return false;
  }
@@ -5361,6 +5363,9 @@ intel_iommu_dev_enable_feat(struct device *dev, enum iommu_dev_features feat)
  	if (feat == IOMMU_DEV_FEAT_AUX)
  		return intel_iommu_enable_auxd(dev);
+ if (feat == IOMMU_DEV_FEAT_IOPF)
+		return intel_iommu_dev_has_feat(dev, feat) ? 0 : -ENODEV;
+
  	if (feat == IOMMU_DEV_FEAT_SVA) {
  		struct device_domain_info *info = get_domain_info(dev);



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