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Date:   Sun, 26 May 2019 18:09:50 +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
Subject: [PATCH v8 15/29] iommu/smmuv3: Introduce __arm_smmu_tlb_inv_asid/s1_range_nosync

Introduce helpers to invalidate a given asid/vmid or invalidate
address ranges associated to a given asid/vmid.

S1 helpers will be used to invalidate stage 1 caches upon
userspace request, in nested mode.

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

---
---
 drivers/iommu/arm-smmu-v3.c | 98 ++++++++++++++++++++++++++++---------
 1 file changed, 74 insertions(+), 24 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index d770977bfc92..724b86ab9a80 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1601,20 +1601,15 @@ static void arm_smmu_tlb_sync(void *cookie)
 	arm_smmu_cmdq_issue_sync(smmu_domain->smmu);
 }
 
-static void arm_smmu_tlb_inv_context(void *cookie)
+static void __arm_smmu_tlb_inv_asid(struct arm_smmu_domain *smmu_domain,
+				    u16 vmid, u16 asid)
 {
-	struct arm_smmu_domain *smmu_domain = cookie;
 	struct arm_smmu_device *smmu = smmu_domain->smmu;
-	struct arm_smmu_cmdq_ent cmd;
+	struct arm_smmu_cmdq_ent cmd = {};
 
-	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
-		cmd.opcode	= CMDQ_OP_TLBI_NH_ASID;
-		cmd.tlbi.asid	= smmu_domain->s1_cfg->cd.asid;
-		cmd.tlbi.vmid	= 0;
-	} else {
-		cmd.opcode	= CMDQ_OP_TLBI_S12_VMALL;
-		cmd.tlbi.vmid	= smmu_domain->s2_cfg->vmid;
-	}
+	cmd.opcode	= CMDQ_OP_TLBI_NH_ASID;
+	cmd.tlbi.vmid	= vmid;
+	cmd.tlbi.asid	= asid;
 
 	/*
 	 * NOTE: when io-pgtable is in non-strict mode, we may get here with
@@ -1626,32 +1621,87 @@ static void arm_smmu_tlb_inv_context(void *cookie)
 	arm_smmu_cmdq_issue_sync(smmu);
 }
 
-static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
-					  size_t granule, bool leaf, void *cookie)
+static void __arm_smmu_tlb_inv_vmid(struct arm_smmu_domain *smmu_domain,
+				    u16 vmid)
+{
+	struct arm_smmu_device *smmu = smmu_domain->smmu;
+	struct arm_smmu_cmdq_ent cmd = {};
+
+	cmd.opcode	= CMDQ_OP_TLBI_S12_VMALL;
+	cmd.tlbi.vmid	= vmid;
+
+	/* See DSB related comment in __arm_smmu_tlb_inv_asid */
+	arm_smmu_cmdq_issue_cmd(smmu, &cmd);
+	arm_smmu_cmdq_issue_sync(smmu);
+}
+
+static void arm_smmu_tlb_inv_context(void *cookie)
 {
 	struct arm_smmu_domain *smmu_domain = cookie;
-	struct arm_smmu_device *smmu = smmu_domain->smmu;
-	struct arm_smmu_cmdq_ent cmd = {
-		.tlbi = {
-			.leaf	= leaf,
-			.addr	= iova,
-		},
-	};
 
 	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
-		cmd.opcode	= CMDQ_OP_TLBI_NH_VA;
-		cmd.tlbi.asid	= smmu_domain->s1_cfg->cd.asid;
+		__arm_smmu_tlb_inv_asid(smmu_domain, 0,
+					smmu_domain->s1_cfg->cd.asid);
 	} else {
-		cmd.opcode	= CMDQ_OP_TLBI_S2_IPA;
-		cmd.tlbi.vmid	= smmu_domain->s2_cfg->vmid;
+		__arm_smmu_tlb_inv_vmid(smmu_domain,
+					smmu_domain->s2_cfg->vmid);
 	}
+}
 
+static void
+__arm_smmu_tlb_inv_s1_range_nosync(struct arm_smmu_domain *smmu_domain,
+				   u16 vmid, u16 asid, unsigned long iova,
+				   size_t size, size_t granule, bool leaf)
+{
+	struct arm_smmu_device *smmu = smmu_domain->smmu;
+	struct arm_smmu_cmdq_ent cmd = {};
+
+	cmd.opcode	= CMDQ_OP_TLBI_NH_VA;
+	cmd.tlbi.vmid	= vmid;
+	cmd.tlbi.asid	= asid;
+	cmd.tlbi.addr	= iova;
+	cmd.tlbi.leaf	= leaf;
 	do {
 		arm_smmu_cmdq_issue_cmd(smmu, &cmd);
 		cmd.tlbi.addr += granule;
 	} while (size -= granule);
 }
 
+static void
+__arm_smmu_tlb_inv_s2_range_nosync(struct arm_smmu_domain *smmu_domain,
+				   u16 vmid, unsigned long iova, size_t size,
+				   size_t granule, bool leaf)
+{
+	struct arm_smmu_device *smmu = smmu_domain->smmu;
+	struct arm_smmu_cmdq_ent cmd = {};
+
+	cmd.opcode	= CMDQ_OP_TLBI_S2_IPA;
+	cmd.tlbi.vmid	= vmid;
+	cmd.tlbi.addr	= iova;
+	cmd.tlbi.leaf	= leaf;
+	do {
+		arm_smmu_cmdq_issue_cmd(smmu, &cmd);
+		cmd.tlbi.addr += granule;
+	} while (size -= granule);
+}
+
+static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
+					  size_t granule, bool leaf,
+					  void *cookie)
+{
+	struct arm_smmu_domain *smmu_domain = cookie;
+
+	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
+		__arm_smmu_tlb_inv_s1_range_nosync(smmu_domain, 0,
+						   smmu_domain->s1_cfg->cd.asid,
+						   iova, size, granule, leaf);
+	} else {
+		__arm_smmu_tlb_inv_s2_range_nosync(smmu_domain,
+						   smmu_domain->s2_cfg->vmid,
+						   iova, size, granule, leaf);
+	}
+}
+
 static const struct iommu_gather_ops arm_smmu_gather_ops = {
 	.tlb_flush_all	= arm_smmu_tlb_inv_context,
 	.tlb_add_flush	= arm_smmu_tlb_inv_range_nosync,
-- 
2.20.1

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