linux-kernel - [RFC v3 10/21] iommu/smmuv3: Implement set_pasid

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Date:   Tue,  8 Jan 2019 11:26:22 +0100
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@...ux.intel.com, jean-philippe.brucker@....com,
        will.deacon@....com, robin.murphy@....com
Cc:     kevin.tian@...el.com, ashok.raj@...el.com, marc.zyngier@....com,
        christoffer.dall@....com, peter.maydell@...aro.org
Subject: [RFC v3 10/21] iommu/smmuv3: Implement set_pasid_table

On set_pasid_table() we program STE S1 related info set
by the guest into the actual physical STEs. At minimum
we need to program the context descriptor GPA and compute
whether the guest wanted to bypass the stage 1 or induce
aborts for this STE.

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

---

v2 -> v3:
- callback now is named set_pasid_table and struct fields
  are laid out differently.

v1 -> v2:
- invalidate the STE before changing them
- hold init_mutex
- handle new fields
---
 drivers/iommu/arm-smmu-v3.c | 68 +++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 9716a301d9ae..0e006babc8a6 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2226,6 +2226,73 @@ static void arm_smmu_put_resv_regions(struct device *dev,
 		kfree(entry);
 }
 
+static int arm_smmu_set_pasid_table(struct iommu_domain *domain,
+				     struct iommu_pasid_table_config *cfg)
+{
+	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+	struct arm_smmu_master_data *entry;
+	struct arm_smmu_s1_cfg *s1_cfg;
+	struct arm_smmu_device *smmu;
+	unsigned long flags;
+	int ret = -EINVAL;
+
+	if (cfg->format != IOMMU_PASID_FORMAT_SMMUV3)
+		return -EINVAL;
+
+	mutex_lock(&smmu_domain->init_mutex);
+
+	smmu = smmu_domain->smmu;
+
+	if (!smmu)
+		goto out;
+
+	if (!((smmu->features & ARM_SMMU_FEAT_TRANS_S1) &&
+	      (smmu->features & ARM_SMMU_FEAT_TRANS_S2))) {
+		dev_info(smmu_domain->smmu->dev,
+			 "does not implement two stages\n");
+		goto out;
+	}
+
+	if (smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED)
+		goto out;
+
+	if (cfg->bypass) {
+		spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+		list_for_each_entry(entry, &smmu_domain->devices, list) {
+			entry->ste.s1_cfg = NULL;
+			entry->ste.nested = false;
+			arm_smmu_install_ste_for_dev(entry->dev->iommu_fwspec);
+		}
+		spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
+
+		s1_cfg->nested_abort = false;
+		s1_cfg->nested_bypass = false;
+		ret = 0;
+		goto out;
+	}
+
+	/* we currently support a single CD. S1DSS and S1FMT are ignored */
+	if (cfg->pasid_bits)
+		goto out;
+
+	s1_cfg = &smmu_domain->s1_cfg;
+	s1_cfg->nested_bypass = cfg->bypass;
+	s1_cfg->nested_abort = cfg->smmuv3.abort;
+	s1_cfg->cdptr_dma = cfg->base_ptr;
+
+	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+	list_for_each_entry(entry, &smmu_domain->devices, list) {
+		entry->ste.s1_cfg = &smmu_domain->s1_cfg;
+		entry->ste.nested = true;
+		arm_smmu_install_ste_for_dev(entry->dev->iommu_fwspec);
+	}
+	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
+	ret = 0;
+out:
+	mutex_unlock(&smmu_domain->init_mutex);
+	return ret;
+}
+
 static struct iommu_ops arm_smmu_ops = {
 	.capable		= arm_smmu_capable,
 	.domain_alloc		= arm_smmu_domain_alloc,
@@ -2244,6 +2311,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.of_xlate		= arm_smmu_of_xlate,
 	.get_resv_regions	= arm_smmu_get_resv_regions,
 	.put_resv_regions	= arm_smmu_put_resv_regions,
+	.set_pasid_table	= arm_smmu_set_pasid_table,
 	.pgsize_bitmap		= -1UL, /* Restricted during device attach */
 };
 
-- 
2.17.2