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[v2,08/11] iommu/arm-smmu-v3: Add HWDBM device feature reporting

Message ID 20210310090614.26668-9-zhukeqian1@huawei.com (mailing list archive)
State New, archived
Headers show
Series vfio/iommu_type1: Implement dirty log tracking based on smmuv3 HTTU | expand

Commit Message

zhukeqian March 10, 2021, 9:06 a.m. UTC 
From: jiangkunkun <jiangkunkun@huawei.com>

We have implemented these interfaces required to support iommu
dirty log tracking. The last step is reporting this feature to
upper user, then the user can perform higher policy base on it.

This adds a new dev feature named IOMMU_DEV_FEAT_HWDBM in iommu
layer. For arm smmuv3, it is equal to ARM_SMMU_FEAT_HD and it is
enabled by default if supported. Other types of IOMMU can enable
it by default or when dev_enable_feature() is called.

Co-developed-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
---

changelog:

v2:
 - As dev_has_feature() has been removed from iommu layer, IOMMU_DEV_FEAT_HWDBM
   is designed to be used through "enable" interface.

---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 4 ++++
 include/linux/iommu.h                       | 1 +
 2 files changed, 5 insertions(+)
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Patch

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 696df51a3282..cd1627123e80 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2722,6 +2722,8 @@  static bool arm_smmu_dev_has_feature(struct device *dev,
 	switch (feat) {
 	case IOMMU_DEV_FEAT_SVA:
 		return arm_smmu_master_sva_supported(master);
+	case IOMMU_DEV_FEAT_HWDBM:
+		return !!(master->smmu->features & ARM_SMMU_FEAT_HD);
 	default:
 		return false;
 	}
@@ -2738,6 +2740,8 @@  static bool arm_smmu_dev_feature_enabled(struct device *dev,
 	switch (feat) {
 	case IOMMU_DEV_FEAT_SVA:
 		return arm_smmu_master_sva_enabled(master);
+	case IOMMU_DEV_FEAT_HWDBM:
+		return arm_smmu_dev_has_feature(dev, feat);
 	default:
 		return false;
 	}
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 4f7db5d23b23..88584a2d027c 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -160,6 +160,7 @@  struct iommu_resv_region {
 enum iommu_dev_features {
 	IOMMU_DEV_FEAT_AUX,	/* Aux-domain feature */
 	IOMMU_DEV_FEAT_SVA,	/* Shared Virtual Addresses */
+	IOMMU_DEV_FEAT_HWDBM,	/* Hardware Dirty Bit Management */
 };
 
 #define IOMMU_PASID_INVALID	(-1U)