linux-kernel - [PATCH v9 09/14] iommu/smmuv3: Implement cache

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Message-Id: <20190711114959.15675-10-eric.auger@redhat.com>
Date:   Thu, 11 Jul 2019 13:49:54 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu, joro@...tes.org,
        alex.williamson@...hat.com, jacob.jun.pan@...ux.intel.com,
        yi.l.liu@...el.com, jean-philippe.brucker@....com,
        will.deacon@....com, robin.murphy@....com
Cc:     kevin.tian@...el.com, ashok.raj@...el.com, marc.zyngier@....com,
        peter.maydell@...aro.org, vincent.stehle@....com,
        zhangfei.gao@...il.com
Subject: [PATCH v9 09/14] iommu/smmuv3: Implement cache_invalidate

Implement domain-selective and page-selective IOTLB invalidations.

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

---
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-smmu-v3.c | 57 +++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 8b3c35ea58b2..9b4654e2f25c 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2575,6 +2575,62 @@ 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_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_IOTLB) {
+		if (inv_info->granularity == IOMMU_INV_GRANU_PASID) {
+			struct iommu_inv_pasid_info *info =
+				&inv_info->pasid_info;
+
+			if (!(info->flags & IOMMU_INV_PASID_FLAGS_ARCHID) ||
+			     (info->flags & IOMMU_INV_PASID_FLAGS_PASID))
+				return -EINVAL;
+
+			__arm_smmu_tlb_inv_asid(smmu_domain,
+						smmu_domain->s2_cfg->vmid,
+						info->archid);
+
+		} else if (inv_info->granularity == IOMMU_INV_GRANU_ADDR) {
+			struct iommu_inv_addr_info *info = &inv_info->addr_info;
+			size_t size = info->nb_granules * info->granule_size;
+			bool leaf = info->flags & IOMMU_INV_ADDR_FLAGS_LEAF;
+
+			if (!(info->flags & IOMMU_INV_ADDR_FLAGS_ARCHID) ||
+			     (info->flags & IOMMU_INV_ADDR_FLAGS_PASID))
+				return -EINVAL;
+
+			__arm_smmu_tlb_inv_s1_range_nosync(smmu_domain,
+							   smmu_domain->s2_cfg->vmid,
+							   info->archid,
+							   info->addr, size,
+							   info->granule_size,
+							   leaf);
+			arm_smmu_cmdq_issue_sync(smmu);
+		} else {
+			return -EINVAL;
+		}
+	}
+	if (inv_info->cache & IOMMU_CACHE_INV_TYPE_PASID ||
+	    inv_info->cache & IOMMU_CACHE_INV_TYPE_DEV_IOTLB) {
+		return -ENOENT;
+	}
+	return 0;
+}
+
 static struct iommu_ops arm_smmu_ops = {
 	.capable		= arm_smmu_capable,
 	.domain_alloc		= arm_smmu_domain_alloc,
@@ -2595,6 +2651,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.put_resv_regions	= arm_smmu_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,
 	.pgsize_bitmap		= -1UL, /* Restricted during device attach */
 };
 
-- 
2.20.1