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Sat, 20 Sep 2025 13:38:56 -0700 (PDT) From: Andrew Jones To: iommu@lists.linux.dev, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: jgg@nvidia.com, zong.li@sifive.com, tjeznach@rivosinc.com, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, anup@brainfault.org, atish.patra@linux.dev, tglx@linutronix.de, alex.williamson@redhat.com, paul.walmsley@sifive.com, palmer@dabbelt.com, alex@ghiti.fr Subject: [RFC PATCH v2 03/18] iommu/riscv: Use data structure instead of individual values Date: Sat, 20 Sep 2025 15:38:53 -0500 Message-ID: <20250920203851.2205115-23-ajones@ventanamicro.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250920203851.2205115-20-ajones@ventanamicro.com> References: <20250920203851.2205115-20-ajones@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Zong Li The parameter will be increased when we need to set up more fields in the device context. Use a data structure to wrap them up. Signed-off-by: Zong Li Signed-off-by: Andrew Jones --- drivers/iommu/riscv/iommu.c | 31 +++++++++++++++++++------------ 1 file changed, 19 insertions(+), 12 deletions(-) diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c index 901d02529a26..a44c67a848fa 100644 --- a/drivers/iommu/riscv/iommu.c +++ b/drivers/iommu/riscv/iommu.c @@ -988,7 +988,7 @@ static void riscv_iommu_iotlb_inval(struct riscv_iommu_domain *domain, * 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; @@ -1022,10 +1022,10 @@ 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); @@ -1304,20 +1304,20 @@ static int riscv_iommu_attach_paging_domain(struct iommu_domain *iommu_domain, struct riscv_iommu_domain *domain = iommu_domain_to_riscv(iommu_domain); struct riscv_iommu_device *iommu = dev_to_iommu(dev); struct riscv_iommu_info *info = dev_iommu_priv_get(dev); - u64 fsc, ta; + struct riscv_iommu_dc dc = {0}; if (!riscv_iommu_pt_supported(iommu, domain->pgd_mode)) return -ENODEV; - fsc = FIELD_PREP(RISCV_IOMMU_PC_FSC_MODE, domain->pgd_mode) | - FIELD_PREP(RISCV_IOMMU_PC_FSC_PPN, virt_to_pfn(domain->pgd_root)); - ta = FIELD_PREP(RISCV_IOMMU_PC_TA_PSCID, domain->pscid) | - RISCV_IOMMU_PC_TA_V; + dc.fsc = FIELD_PREP(RISCV_IOMMU_PC_FSC_MODE, domain->pgd_mode) | + FIELD_PREP(RISCV_IOMMU_PC_FSC_PPN, virt_to_pfn(domain->pgd_root)); + 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; @@ -1408,9 +1408,12 @@ 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; @@ -1429,8 +1432,12 @@ 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; -- 2.49.0