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From: fangyu.yu@linux.alibaba.com
To: joro@8bytes.org, will@kernel.org, robin.murphy@arm.com,
	pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu,
	alex@ghiti.fr, tjeznach@rivosinc.com, jgg@ziepe.ca,
	kevin.tian@intel.com, baolu.lu@linux.intel.com,
	vasant.hegde@amd.com, anup@brainfault.org, atish.patra@linux.dev,
	skhawaja@google.com, jgg@nvidia.com
Cc: guoren@kernel.org, andrew.jones@oss.qualcomm.com,
	kvm@vger.kernel.org, iommu@lists.linux.dev,
	kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org,
	linux-kernel@vger.kernel.org, Zong Li <zong.li@sifive.com>,
	Fangyu Yu <fangyu.yu@linux.alibaba.com>
Subject: [RFC PATCH v2 04/10] iommu/riscv: use data structure instead of individual values
Date: Thu,  7 May 2026 19:37:00 +0800	[thread overview]
Message-ID: <20260507113706.11400-5-fangyu.yu@linux.alibaba.com> (raw)
In-Reply-To: <20260507113706.11400-1-fangyu.yu@linux.alibaba.com>

From: Zong Li <zong.li@sifive.com>

The parameter will be increased when we need to set up more
bit fields in the device context. Use a data structure to
wrap them up.

Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Fangyu Yu <fangyu.yu@linux.alibaba.com>
---
 drivers/iommu/riscv/iommu.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c
index bd36e3b5d13f..5b8e0072cd1a 100644
--- a/drivers/iommu/riscv/iommu.c
+++ b/drivers/iommu/riscv/iommu.c
@@ -1077,7 +1077,7 @@ static void riscv_iommu_iodir_iotinval(struct riscv_iommu_device *iommu,
  * interim translation faults.
  */
 static void riscv_iommu_iodir_update(struct riscv_iommu_device *iommu,
-				     struct device *dev, u64 fsc, u64 ta)
+				     struct device *dev, struct riscv_iommu_dc *new_dc)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct riscv_iommu_dc *dc;
@@ -1116,10 +1116,10 @@ static void riscv_iommu_iodir_update(struct riscv_iommu_device *iommu,
 	for (i = 0; i < fwspec->num_ids; i++) {
 		dc = riscv_iommu_get_dc(iommu, fwspec->ids[i]);
 		tc = READ_ONCE(dc->tc);
-		tc |= ta & RISCV_IOMMU_DC_TC_V;
+		tc |= new_dc->ta & RISCV_IOMMU_DC_TC_V;
 
-		WRITE_ONCE(dc->fsc, fsc);
-		WRITE_ONCE(dc->ta, ta & RISCV_IOMMU_PC_TA_PSCID);
+		WRITE_ONCE(dc->fsc, new_dc->fsc);
+		WRITE_ONCE(dc->ta, new_dc->ta & RISCV_IOMMU_PC_TA_PSCID);
 		/* Update device context, write TC.V as the last step. */
 		dma_wmb();
 		WRITE_ONCE(dc->tc, tc);
@@ -1205,22 +1205,22 @@ static int riscv_iommu_attach_paging_domain(struct iommu_domain *iommu_domain,
 	struct riscv_iommu_device *iommu = dev_to_iommu(dev);
 	struct riscv_iommu_info *info = dev_iommu_priv_get(dev);
 	struct pt_iommu_riscv_64_hw_info pt_info;
-	u64 fsc, ta;
+	struct riscv_iommu_dc dc = {0};
 
 	pt_iommu_riscv_64_hw_info(&domain->riscvpt, &pt_info);
 
 	if (!riscv_iommu_pt_supported(iommu, pt_info.fsc_iosatp_mode))
 		return -ENODEV;
 
-	fsc = FIELD_PREP(RISCV_IOMMU_PC_FSC_MODE, pt_info.fsc_iosatp_mode) |
+	dc.fsc = FIELD_PREP(RISCV_IOMMU_PC_FSC_MODE, pt_info.fsc_iosatp_mode) |
 	      FIELD_PREP(RISCV_IOMMU_PC_FSC_PPN, pt_info.ppn);
-	ta = FIELD_PREP(RISCV_IOMMU_PC_TA_PSCID, domain->pscid) |
+	dc.ta = FIELD_PREP(RISCV_IOMMU_PC_TA_PSCID, domain->pscid) |
 	     RISCV_IOMMU_PC_TA_V;
 
 	if (riscv_iommu_bond_link(domain, dev))
 		return -ENOMEM;
 
-	riscv_iommu_iodir_update(iommu, dev, fsc, ta);
+	riscv_iommu_iodir_update(iommu, dev, &dc);
 	riscv_iommu_bond_unlink(info->domain, dev);
 	info->domain = domain;
 
@@ -1292,9 +1292,12 @@ static int riscv_iommu_attach_blocking_domain(struct iommu_domain *iommu_domain,
 {
 	struct riscv_iommu_device *iommu = dev_to_iommu(dev);
 	struct riscv_iommu_info *info = dev_iommu_priv_get(dev);
+	struct riscv_iommu_dc dc = {0};
+
+	dc.fsc = RISCV_IOMMU_FSC_BARE;
 
 	/* Make device context invalid, translation requests will fault w/ #258 */
-	riscv_iommu_iodir_update(iommu, dev, RISCV_IOMMU_FSC_BARE, 0);
+	riscv_iommu_iodir_update(iommu, dev, &dc);
 	riscv_iommu_bond_unlink(info->domain, dev);
 	info->domain = NULL;
 
@@ -1314,8 +1317,12 @@ static int riscv_iommu_attach_identity_domain(struct iommu_domain *iommu_domain,
 {
 	struct riscv_iommu_device *iommu = dev_to_iommu(dev);
 	struct riscv_iommu_info *info = dev_iommu_priv_get(dev);
+	struct riscv_iommu_dc dc = {0};
+
+	dc.fsc = RISCV_IOMMU_FSC_BARE;
+	dc.ta = RISCV_IOMMU_PC_TA_V;
 
-	riscv_iommu_iodir_update(iommu, dev, RISCV_IOMMU_FSC_BARE, RISCV_IOMMU_PC_TA_V);
+	riscv_iommu_iodir_update(iommu, dev, &dc);
 	riscv_iommu_bond_unlink(info->domain, dev);
 	info->domain = NULL;
 
-- 
2.50.1


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  parent reply	other threads:[~2026-05-07 11:37 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-07 11:36 [RFC PATCH v2 00/10] iommu/riscv: Add hardware dirty tracking for second-stage domains fangyu.yu
2026-05-07 11:36 ` [RFC PATCH v2 01/10] iommupt: Add RISC-V Second-stage (iohgatp) page table support fangyu.yu
2026-05-07 11:36 ` [RFC PATCH v2 02/10] iommupt: Add RISC-V dirty tracking PTE ops fangyu.yu
2026-05-07 11:36 ` [RFC PATCH v2 03/10] iommu/riscv: report iommu capabilities fangyu.yu
2026-05-07 11:37 ` fangyu.yu [this message]
2026-05-07 11:37 ` [RFC PATCH v2 05/10] iommu/riscv: support GSCID and GVMA invalidation command fangyu.yu
2026-05-07 11:37 ` [RFC PATCH v2 06/10] RISC-V: KVM: Enable KVM_VFIO interfaces on RISC-V arch fangyu.yu
2026-05-07 11:37 ` [RFC PATCH v2 07/10] iommu/riscv: Add domain_alloc_paging_flags for second-stage domain fangyu.yu
2026-05-07 11:37 ` [RFC PATCH v2 08/10] iommu/riscv: Pre-enable GADE for second-stage domains fangyu.yu
2026-05-07 11:37 ` [RFC PATCH v2 09/10] iommu/riscv: Add dirty tracking support " fangyu.yu
2026-05-07 11:37 ` [RFC PATCH v2 10/10] iommu/riscv: Add IOTINVAL.GVMA after updating DDT/PDT entries fangyu.yu

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