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From:   Eric Auger <eric.auger@redhat.com>
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Subject: [RFC v16 7/9] iommu/smmuv3: Implement cache_invalidate
Date:   Wed, 27 Oct 2021 12:44:26 +0200
Message-Id: <20211027104428.1059740-8-eric.auger@redhat.com>
In-Reply-To: <20211027104428.1059740-1-eric.auger@redhat.com>
References: <20211027104428.1059740-1-eric.auger@redhat.com>
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Implement domain-selective, pasid selective and page-selective
IOTLB invalidations.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---

v15 -> v16:
- make sure the range is set (RIL guest) and check the granule
  size is supported by the physical IOMMU
- use cmd_with_sync

v14 -> v15:
- remove the redundant arm_smmu_cmdq_issue_sync(smmu)
  in IOMMU_INV_GRANU_ADDR case (Zenghui)
- if RIL is not supported by the host, make sure the granule_size
  that is passed by the userspace is supported or fix it
  (Chenxiang)

v13 -> v14:
- Add domain invalidation
- do global inval when asid is not provided with addr
  granularity

v7 -> v8:
- ASID based invalidation using iommu_inv_pasid_info
- check ARCHID/PASID flags in addr based invalidation
- use __arm_smmu_tlb_inv_context and __arm_smmu_tlb_inv_range_nosync

v6 -> v7
- check the uapi version

v3 -> v4:
- adapt to changes in the uapi
- add support for leaf parameter
- do not use arm_smmu_tlb_inv_range_nosync or arm_smmu_tlb_inv_context
  anymore

v2 -> v3:
- replace __arm_smmu_tlb_sync by arm_smmu_cmdq_issue_sync

v1 -> v2:
- properly pass the asid
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 82 +++++++++++++++++++++
 1 file changed, 82 insertions(+)

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 d5e722105624..e84a7c3e8730 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2923,6 +2923,87 @@ static void arm_smmu_detach_pasid_table(struct iommu_domain *domain)
 	mutex_unlock(&smmu_domain->init_mutex);
 }
 
+static int
+arm_smmu_cache_invalidate(struct iommu_domain *domain, struct device *dev,
+			  struct iommu_cache_invalidate_info *inv_info)
+{
+	struct arm_smmu_cmdq_ent cmd = {.opcode = CMDQ_OP_TLBI_NSNH_ALL};
+	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+	struct arm_smmu_device *smmu = smmu_domain->smmu;
+
+	if (smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED)
+		return -EINVAL;
+
+	if (!smmu)
+		return -EINVAL;
+
+	if (inv_info->version != IOMMU_CACHE_INVALIDATE_INFO_VERSION_1)
+		return -EINVAL;
+
+	if (inv_info->cache & IOMMU_CACHE_INV_TYPE_PASID ||
+	    inv_info->cache & IOMMU_CACHE_INV_TYPE_DEV_IOTLB) {
+		return -ENOENT;
+	}
+
+	if (!(inv_info->cache & IOMMU_CACHE_INV_TYPE_IOTLB))
+		return -EINVAL;
+
+	/* IOTLB invalidation */
+
+	switch (inv_info->granularity) {
+	case IOMMU_INV_GRANU_PASID:
+	{
+		struct iommu_inv_pasid_info *info =
+			&inv_info->granu.pasid_info;
+
+		if (info->flags & IOMMU_INV_ADDR_FLAGS_PASID)
+			return -ENOENT;
+		if (!(info->flags & IOMMU_INV_PASID_FLAGS_ARCHID))
+			return -EINVAL;
+
+		__arm_smmu_tlb_inv_context(smmu_domain, info->archid);
+		return 0;
+	}
+	case IOMMU_INV_GRANU_ADDR:
+	{
+		struct iommu_inv_addr_info *info = &inv_info->granu.addr_info;
+		uint64_t granule_size  = info->granule_size;
+		uint64_t size = info->nb_granules * info->granule_size;
+		bool leaf = info->flags & IOMMU_INV_ADDR_FLAGS_LEAF;
+		int tg;
+
+		if (info->flags & IOMMU_INV_ADDR_FLAGS_PASID)
+			return -ENOENT;
+
+		if (!(info->flags & IOMMU_INV_ADDR_FLAGS_ARCHID))
+			break;
+
+		tg = __ffs(granule_size);
+		if (!granule_size || granule_size & ~(1ULL << tg) ||
+		    !(granule_size & smmu->pgsize_bitmap))
+			return -EINVAL;
+
+		/* range invalidation must be used */
+		if (!size)
+			return -EINVAL;
+
+		arm_smmu_tlb_inv_range_domain(info->addr, size,
+					      granule_size, leaf,
+					      info->archid, smmu_domain);
+		return 0;
+	}
+	case IOMMU_INV_GRANU_DOMAIN:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Global S1 invalidation */
+	cmd.tlbi.vmid   = smmu_domain->s2_cfg.vmid;
+	arm_smmu_cmdq_issue_cmd_with_sync(smmu, &cmd);
+	return 0;
+}
+
 static bool arm_smmu_dev_has_feature(struct device *dev,
 				     enum iommu_dev_features feat)
 {
@@ -3022,6 +3103,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.put_resv_regions	= generic_iommu_put_resv_regions,
 	.attach_pasid_table	= arm_smmu_attach_pasid_table,
 	.detach_pasid_table	= arm_smmu_detach_pasid_table,
+	.cache_invalidate	= arm_smmu_cache_invalidate,
 	.dev_has_feat		= arm_smmu_dev_has_feature,
 	.dev_feat_enabled	= arm_smmu_dev_feature_enabled,
 	.dev_enable_feat	= arm_smmu_dev_enable_feature,
-- 
2.26.3