diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index f1e18e81fca7..e71a4153041d 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -196,6 +196,7 @@ enum iommu_dev_features {
 	IOMMU_DEV_FEAT_IOPF,
 };
 
+#define IOMMU_NO_PASID	(0U) /* Reserved for DMA w/o PASID */
 #define IOMMU_PASID_INVALID	(-1U)
 typedef unsigned int ioasid_t;
 
diff --git a/drivers/iommu/intel/pasid.h b/drivers/iommu/intel/pasid.h
index d6b7d21244b1..4e9e68c3c388 100644
--- a/drivers/iommu/intel/pasid.h
+++ b/drivers/iommu/intel/pasid.h
@@ -10,8 +10,6 @@
 #ifndef __INTEL_PASID_H
 #define __INTEL_PASID_H
 
-#define PASID_RID2PASID			0x0
-#define PASID_MIN			0x1
 #define PASID_MAX			0x100000
 #define PASID_PTE_MASK			0x3F
 #define PASID_PTE_PRESENT		1
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index a5a63b1c947e..5e6b39881c04 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -80,7 +80,7 @@ arm_smmu_share_asid(struct mm_struct *mm, u16 asid)
 	 * be some overlap between use of both ASIDs, until we invalidate the
 	 * TLB.
 	 */
-	arm_smmu_write_ctx_desc(smmu_domain, 0, cd);
+	arm_smmu_write_ctx_desc(smmu_domain, IOMMU_NO_PASID, cd);
 
 	/* Invalidate TLB entries previously associated with that context */
 	arm_smmu_tlb_inv_asid(smmu, asid);
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 9b0dc3505601..ee70687f060b 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1059,7 +1059,7 @@ int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain, int ssid,
 	/*
 	 * This function handles the following cases:
 	 *
-	 * (1) Install primary CD, for normal DMA traffic (SSID = 0).
+	 * (1) Install primary CD, for normal DMA traffic (SSID = IOMMU_NO_PASID = 0).
 	 * (2) Install a secondary CD, for SID+SSID traffic.
 	 * (3) Update ASID of a CD. Atomically write the first 64 bits of the
 	 *     CD, then invalidate the old entry and mappings.
@@ -1607,7 +1607,7 @@ static void arm_smmu_handle_ppr(struct arm_smmu_device *smmu, u64 *evt)
 
 	sid = FIELD_GET(PRIQ_0_SID, evt[0]);
 	ssv = FIELD_GET(PRIQ_0_SSID_V, evt[0]);
-	ssid = ssv ? FIELD_GET(PRIQ_0_SSID, evt[0]) : 0;
+	ssid = ssv ? FIELD_GET(PRIQ_0_SSID, evt[0]) : IOMMU_NO_PASID;
 	last = FIELD_GET(PRIQ_0_PRG_LAST, evt[0]);
 	grpid = FIELD_GET(PRIQ_1_PRG_IDX, evt[1]);
 
@@ -1748,7 +1748,7 @@ arm_smmu_atc_inv_to_cmd(int ssid, unsigned long iova, size_t size,
 	 */
 	*cmd = (struct arm_smmu_cmdq_ent) {
 		.opcode			= CMDQ_OP_ATC_INV,
-		.substream_valid	= !!ssid,
+		.substream_valid	= (ssid != IOMMU_NO_PASID),
 		.atc.ssid		= ssid,
 	};
 
@@ -1795,7 +1795,7 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master)
 	struct arm_smmu_cmdq_ent cmd;
 	struct arm_smmu_cmdq_batch cmds;
 
-	arm_smmu_atc_inv_to_cmd(0, 0, 0, &cmd);
+	arm_smmu_atc_inv_to_cmd(IOMMU_NO_PASID, 0, 0, &cmd);
 
 	cmds.num = 0;
 	for (i = 0; i < master->num_streams; i++) {
@@ -1875,7 +1875,7 @@ static void arm_smmu_tlb_inv_context(void *cookie)
 		cmd.tlbi.vmid	= smmu_domain->s2_cfg.vmid;
 		arm_smmu_cmdq_issue_cmd_with_sync(smmu, &cmd);
 	}
-	arm_smmu_atc_inv_domain(smmu_domain, 0, 0, 0);
+	arm_smmu_atc_inv_domain(smmu_domain, IOMMU_NO_PASID, 0, 0);
 }
 
 static void __arm_smmu_tlb_inv_range(struct arm_smmu_cmdq_ent *cmd,
@@ -1968,7 +1968,7 @@ static void arm_smmu_tlb_inv_range_domain(unsigned long iova, size_t size,
 	 * Unfortunately, this can't be leaf-only since we may have
 	 * zapped an entire table.
 	 */
-	arm_smmu_atc_inv_domain(smmu_domain, 0, iova, size);
+	arm_smmu_atc_inv_domain(smmu_domain, IOMMU_NO_PASID, iova, size);
 }
 
 void arm_smmu_tlb_inv_range_asid(unsigned long iova, size_t size, int asid,
@@ -2142,7 +2142,7 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
 	 * the master has been added to the devices list for this domain.
 	 * This isn't an issue because the STE hasn't been installed yet.
 	 */
-	ret = arm_smmu_write_ctx_desc(smmu_domain, 0, &cfg->cd);
+	ret = arm_smmu_write_ctx_desc(smmu_domain, IOMMU_NO_PASID, &cfg->cd);
 	if (ret)
 		goto out_free_cd_tables;
 
@@ -2328,7 +2328,7 @@ static void arm_smmu_enable_ats(struct arm_smmu_master *master)
 	pdev = to_pci_dev(master->dev);
 
 	atomic_inc(&smmu_domain->nr_ats_masters);
-	arm_smmu_atc_inv_domain(smmu_domain, 0, 0, 0);
+	arm_smmu_atc_inv_domain(smmu_domain, IOMMU_NO_PASID, 0, 0);
 	if (pci_enable_ats(pdev, stu))
 		dev_err(master->dev, "Failed to enable ATS (STU %zu)\n", stu);
 }
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index d5ca2387e65c..89013a2913af 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -877,7 +877,7 @@ void dmar_fault_dump_ptes(struct intel_iommu *iommu, u16 source_id,
 	}
 	/* For request-without-pasid, get the pasid from context entry */
 	if (intel_iommu_sm && pasid == IOMMU_PASID_INVALID)
-		pasid = PASID_RID2PASID;
+		pasid = IOMMU_NO_PASID;
 
 	dir_index = pasid >> PASID_PDE_SHIFT;
 	pde = &dir[dir_index];
@@ -1449,7 +1449,7 @@ static void __iommu_flush_dev_iotlb(struct device_domain_info *info,
 	qdep = info->ats_qdep;
 	qi_flush_dev_iotlb(info->iommu, sid, info->pfsid,
 			   qdep, addr, mask);
-	quirk_extra_dev_tlb_flush(info, addr, mask, PASID_RID2PASID, qdep);
+	quirk_extra_dev_tlb_flush(info, addr, mask, IOMMU_NO_PASID, qdep);
 }
 
 static void iommu_flush_dev_iotlb(struct dmar_domain *domain,
@@ -1484,7 +1484,7 @@ static void iommu_flush_iotlb_psi(struct intel_iommu *iommu,
 		ih = 1 << 6;
 
 	if (domain->use_first_level) {
-		qi_flush_piotlb(iommu, did, PASID_RID2PASID, addr, pages, ih);
+		qi_flush_piotlb(iommu, did, IOMMU_NO_PASID, addr, pages, ih);
 	} else {
 		unsigned long bitmask = aligned_pages - 1;
 
@@ -1554,7 +1554,7 @@ static void intel_flush_iotlb_all(struct iommu_domain *domain)
 		u16 did = domain_id_iommu(dmar_domain, iommu);
 
 		if (dmar_domain->use_first_level)
-			qi_flush_piotlb(iommu, did, PASID_RID2PASID, 0, -1, 0);
+			qi_flush_piotlb(iommu, did, IOMMU_NO_PASID, 0, -1, 0);
 		else
 			iommu->flush.flush_iotlb(iommu, did, 0, 0,
 						 DMA_TLB_DSI_FLUSH);
@@ -1940,7 +1940,7 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
 				context_pdts(pds);
 
 		/* Setup the RID_PASID field: */
-		context_set_sm_rid2pasid(context, PASID_RID2PASID);
+		context_set_sm_rid2pasid(context, IOMMU_NO_PASID);
 
 		/*
 		 * Setup the Device-TLB enable bit and Page request
@@ -2420,13 +2420,13 @@ static int dmar_domain_attach_device(struct dmar_domain *domain,
 		/* Setup the PASID entry for requests without PASID: */
 		if (hw_pass_through && domain_type_is_si(domain))
 			ret = intel_pasid_setup_pass_through(iommu, domain,
-					dev, PASID_RID2PASID);
+					dev, IOMMU_NO_PASID);
 		else if (domain->use_first_level)
 			ret = domain_setup_first_level(iommu, domain, dev,
-					PASID_RID2PASID);
+					IOMMU_NO_PASID);
 		else
 			ret = intel_pasid_setup_second_level(iommu, domain,
-					dev, PASID_RID2PASID);
+					dev, IOMMU_NO_PASID);
 		if (ret) {
 			dev_err(dev, "Setup RID2PASID failed\n");
 			device_block_translation(dev);
@@ -3961,7 +3961,7 @@ static void dmar_remove_one_dev_info(struct device *dev)
 	if (!dev_is_real_dma_subdevice(info->dev)) {
 		if (dev_is_pci(info->dev) && sm_supported(iommu))
 			intel_pasid_tear_down_entry(iommu, info->dev,
-					PASID_RID2PASID, false);
+					IOMMU_NO_PASID, false);
 
 		iommu_disable_pci_caps(info);
 		domain_context_clear(info);
@@ -3990,7 +3990,7 @@ static void device_block_translation(struct device *dev)
 	if (!dev_is_real_dma_subdevice(dev)) {
 		if (sm_supported(iommu))
 			intel_pasid_tear_down_entry(iommu, dev,
-						    PASID_RID2PASID, false);
+						    IOMMU_NO_PASID, false);
 		else
 			domain_context_clear(info);
 	}
@@ -4324,7 +4324,7 @@ static void domain_set_force_snooping(struct dmar_domain *domain)
 
 	list_for_each_entry(info, &domain->devices, link)
 		intel_pasid_setup_page_snoop_control(info->iommu, info->dev,
-						     PASID_RID2PASID);
+						     IOMMU_NO_PASID);
 }
 
 static bool intel_iommu_enforce_cache_coherency(struct iommu_domain *domain)
@@ -4980,7 +4980,7 @@ void quirk_extra_dev_tlb_flush(struct device_domain_info *info,
 		return;
 
 	sid = PCI_DEVID(info->bus, info->devfn);
-	if (pasid == PASID_RID2PASID) {
+	if (pasid == IOMMU_NO_PASID) {
 		qi_flush_dev_iotlb(info->iommu, sid, info->pfsid,
 				   qdep, address, mask);
 	} else {
diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index c5d479770e12..23dca3bc319d 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -438,7 +438,7 @@ devtlb_invalidation_with_pasid(struct intel_iommu *iommu,
 	 * SVA usage, device could do DMA with multiple PASIDs. It is more
 	 * efficient to flush devTLB specific to the PASID.
 	 */
-	if (pasid == PASID_RID2PASID)
+	if (pasid == IOMMU_NO_PASID)
 		qi_flush_dev_iotlb(iommu, sid, pfsid, qdep, 0, 64 - VTD_PAGE_SHIFT);
 	else
 		qi_flush_dev_iotlb_pasid(iommu, sid, pfsid, pasid, qdep, 0, 64 - VTD_PAGE_SHIFT);
