From: Guanghui Feng <guanghuifeng@linux•alibaba.com>
To: jgg@ziepe•ca
Cc: adrian.larumbe@collabora•com, airlied@gmail•com,
alex@shazbot•org, alikernel-developer@linux•alibaba.com,
baolu.lu@linux•intel.com, boris.brezillon@collabora•com,
dri-devel@lists•freedesktop.org, dwmw2@infradead•org,
iommu@lists•linux.dev, joro@8bytes•org, kevin.tian@intel•com,
kvm@vger•kernel.org, linux-arm-kernel@lists•infradead.org,
linux-kernel@vger•kernel.org, liviu.dudau@arm•com,
maarten.lankhorst@linux•intel.com, mripard@kernel•org,
oliver.yang@linux•alibaba.com, robh@kernel•org,
robin.murphy@arm•com, shiyu.zsq@linux•alibaba.com,
steven.price@arm•com, suravee.suthikulpanit@amd•com,
tzimmermann@suse•de, wei.guo.simon@linux•alibaba.com,
will@kernel•org, xlpang@linux•alibaba.com
Subject: [PATCH v3 01/32] iommu: introduce iova_to_phys_length in iommu_domain_ops
Date: Wed, 3 Jun 2026 23:17:33 +0800 [thread overview]
Message-ID: <20260603151804.1963871-2-guanghuifeng@linux.alibaba.com> (raw)
In-Reply-To: <20260603151804.1963871-1-guanghuifeng@linux.alibaba.com>
Add iova_to_phys_length callback to struct iommu_domain_ops alongside
the existing iova_to_phys. The new callback returns both the physical
address and the PTE mapping page size in a single page table walk.
Add iommu_iova_to_phys_length() core function that:
- Checks ops->iova_to_phys_length first (preferred path)
- Falls back to ops->iova_to_phys for unmigrated drivers
This enables callers like VFIO to efficiently traverse IOVA space
by actual mapping granularity instead of fixed PAGE_SIZE steps.
Signed-off-by: Guanghui Feng <guanghuifeng@linux•alibaba.com>
Acked-by: Shiqiang Zhang <shiyu.zsq@linux•alibaba.com>
Acked-by: Simon Guo <wei.guo.simon@linux•alibaba.com>
---
drivers/iommu/iommu.c | 50 ++++++++++++++++++++++++++++++++++++++-----
include/linux/iommu.h | 9 ++++++++
2 files changed, 54 insertions(+), 5 deletions(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index d1a9e713d3a0..320ea13488e7 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2545,15 +2545,55 @@ void iommu_detach_group(struct iommu_domain *domain, struct iommu_group *group)
}
EXPORT_SYMBOL_GPL(iommu_detach_group);
-phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
+/**
+ * iommu_iova_to_phys_length - Translate IOVA and return mapping page size
+ * @domain: IOMMU domain to query
+ * @iova: IO virtual address to translate
+ * @mapped_length: Output parameter for the PTE page size (e.g. 4KB/2MB/1GB)
+ *
+ * Like iommu_iova_to_phys() but additionally returns the page size of the
+ * PTE mapping at @iova through @mapped_length.
+ *
+ * Return: The physical address for the given IOVA, or PHYS_ADDR_MAX if no
+ * translation exists.
+ */
+phys_addr_t iommu_iova_to_phys_length(struct iommu_domain *domain,
+ dma_addr_t iova,
+ size_t *mapped_length)
{
- if (domain->type == IOMMU_DOMAIN_IDENTITY)
+ phys_addr_t phys;
+
+ if (domain->type == IOMMU_DOMAIN_IDENTITY) {
+ if (mapped_length)
+ *mapped_length = PAGE_SIZE;
return iova;
+ }
- if (domain->type == IOMMU_DOMAIN_BLOCKED)
- return 0;
+ if (mapped_length)
+ *mapped_length = 0;
+
+ if (domain->ops->iova_to_phys_length)
+ return domain->ops->iova_to_phys_length(domain, iova, mapped_length);
+
+ /* Fallback to legacy iova_to_phys without length info */
+ if (!domain->ops->iova_to_phys)
+ return PHYS_ADDR_MAX;
+
+ phys = domain->ops->iova_to_phys(domain, iova);
+ if (!phys)
+ return PHYS_ADDR_MAX;
+
+ if (mapped_length)
+ *mapped_length = PAGE_SIZE;
+ return phys;
+}
+EXPORT_SYMBOL_GPL(iommu_iova_to_phys_length);
+
+phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
+{
+ phys_addr_t phys = iommu_iova_to_phys_length(domain, iova, NULL);
- return domain->ops->iova_to_phys(domain, iova);
+ return (phys == PHYS_ADDR_MAX) ? 0 : phys;
}
EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index e587d4ac4d33..19da84c2922c 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -747,6 +747,9 @@ struct iommu_ops {
* invalidation requests. The driver data structure
* must be defined in include/uapi/linux/iommufd.h
* @iova_to_phys: translate iova to physical address
+ * @iova_to_phys_length: translate iova to physical address and additionally
+ * return the page size of the PTE mapping at @iova
+ * through @mapped_length.
* @enforce_cache_coherency: Prevent any kind of DMA from bypassing IOMMU_CACHE,
* including no-snoop TLPs on PCIe or other platform
* specific mechanisms.
@@ -776,6 +779,9 @@ struct iommu_domain_ops {
phys_addr_t (*iova_to_phys)(struct iommu_domain *domain,
dma_addr_t iova);
+ phys_addr_t (*iova_to_phys_length)(struct iommu_domain *domain,
+ dma_addr_t iova,
+ size_t *mapped_length);
bool (*enforce_cache_coherency)(struct iommu_domain *domain);
int (*set_pgtable_quirks)(struct iommu_domain *domain,
@@ -930,6 +936,9 @@ extern ssize_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
struct scatterlist *sg, unsigned int nents,
int prot, gfp_t gfp);
extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova);
+extern phys_addr_t iommu_iova_to_phys_length(struct iommu_domain *domain,
+ dma_addr_t iova,
+ size_t *mapped_length);
extern void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler, void *token);
--
2.43.7
next prev parent reply other threads:[~2026-06-03 15:19 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20260529115116.GR2487554@ziepe.ca>
2026-05-31 9:36 ` [PATCH 0/9] iommu: introduce iova_to_phys_length for efficient IOVA-to-physical translation Guanghui Feng
2026-05-31 9:36 ` [PATCH 1/9] iommu: introduce iova_to_phys_length in iommu_domain_ops Guanghui Feng
2026-05-31 23:51 ` Jason Gunthorpe
2026-06-01 8:41 ` guanghuifeng
2026-06-01 13:43 ` Jason Gunthorpe
2026-06-01 14:14 ` guanghuifeng
2026-06-01 14:31 ` Jason Gunthorpe
2026-05-31 9:36 ` [PATCH 2/9] iommu/io-pgtable: introduce iova_to_phys_length in io_pgtable_ops Guanghui Feng
2026-05-31 9:36 ` [PATCH 3/9] iommu/generic_pt: implement iova_to_phys_length Guanghui Feng
2026-05-31 23:54 ` Jason Gunthorpe
2026-06-01 9:23 ` guanghuifeng
[not found] ` <fa924b86-1ca9-4819-8330-0d5f6ede8923@linux.alibaba.com>
2026-06-01 14:32 ` Jason Gunthorpe
2026-06-02 7:20 ` guanghuifeng
2026-06-02 12:32 ` Jason Gunthorpe
2026-05-31 9:36 ` [PATCH 4/9] iommu/arm-smmu: " Guanghui Feng
2026-05-31 9:36 ` [PATCH 5/9] iommu: apple-dart/ipmmu/mtk_iommu " Guanghui Feng
2026-05-31 9:36 ` [PATCH 6/9] iommu: direct page-table drivers " Guanghui Feng
2026-05-31 9:36 ` [PATCH 7/9] vfio/iommufd: use iova_to_phys_length for efficient unmap Guanghui Feng
2026-05-31 23:58 ` Jason Gunthorpe
2026-05-31 9:36 ` [PATCH 8/9] drm/gpu, iommu/io-pgtable: switch to iova_to_phys_length Guanghui Feng
2026-05-31 9:36 ` [PATCH 9/9] iommu: remove deprecated iova_to_phys from domain_ops and io_pgtable_ops Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 00/30] iommu: introduce iova_to_phys_length for efficient IOVA-to-physical translation Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 01/30] iommu: introduce iova_to_phys_length in iommu_domain_ops Guanghui Feng
2026-06-03 1:08 ` Jason Gunthorpe
2026-06-02 10:46 ` [PATCH v2 02/30] iommu/io-pgtable-arm: introduce iova_to_phys_length in io_pgtable_ops Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 03/30] iommu/io-pgtable-arm-v7s: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 04/30] iommu/io-pgtable-dart: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 05/30] iommu/generic_pt: implement iova_to_phys_length Guanghui Feng
2026-06-03 1:11 ` Jason Gunthorpe
2026-06-02 10:46 ` [PATCH v2 06/30] iommu/arm-smmu-v3: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 07/30] iommu/arm-smmu: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 08/30] iommu/qcom_iommu: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 09/30] iommu/apple-dart: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 10/30] iommu/ipmmu-vmsa: " Guanghui Feng
2026-06-03 1:13 ` Jason Gunthorpe
2026-06-02 10:46 ` [PATCH v2 11/30] iommu/mtk_iommu: " Guanghui Feng
2026-06-03 1:17 ` Jason Gunthorpe
2026-06-02 10:46 ` [PATCH v2 12/30] iommu/exynos: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 13/30] iommu/fsl_pamu: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 14/30] iommu/msm: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 15/30] iommu/mtk_v1: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 16/30] iommu/omap: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 17/30] iommu/rockchip: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 18/30] iommu/s390: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 19/30] iommu/sprd: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 20/30] iommu/sun50i: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 21/30] iommu/tegra-smmu: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 22/30] iommu/virtio: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 23/30] vfio/iommufd: use iova_to_phys_length for efficient unmap Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 24/30] drm/panfrost: switch to iova_to_phys_length Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 25/30] drm/panthor: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 26/30] iommu/io-pgtable: selftests " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 27/30] iommu/io-pgtable-arm: remove deprecated iova_to_phys wrapper Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 28/30] iommu/io-pgtable-arm-v7s: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 29/30] iommu/io-pgtable-dart: " Guanghui Feng
2026-06-02 10:46 ` [PATCH v2 30/30] iommu: remove iova_to_phys from domain_ops and io_pgtable_ops Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 00/32] iommu: introduce iova_to_phys_length and remove iova_to_phys Guanghui Feng
2026-06-03 15:17 ` Guanghui Feng [this message]
2026-06-04 2:44 ` [PATCH v3 01/32] iommu: introduce iova_to_phys_length in iommu_domain_ops Baolu Lu
2026-06-04 14:16 ` Jason Gunthorpe
2026-06-03 15:17 ` [PATCH v3 02/32] iommu/io-pgtable-arm: introduce iova_to_phys_length in io_pgtable_ops Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 03/32] iommu/io-pgtable-arm-v7s: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 04/32] iommu/io-pgtable-dart: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 05/32] iommu/generic_pt: implement iova_to_phys_length Guanghui Feng
2026-06-04 3:30 ` Baolu Lu
2026-06-04 14:12 ` Jason Gunthorpe
2026-06-03 15:17 ` [PATCH v3 06/32] iommu/arm-smmu-v3: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 07/32] iommu/arm-smmu: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 08/32] iommu/qcom_iommu: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 09/32] iommu/apple-dart: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 10/32] iommu/ipmmu-vmsa: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 11/32] iommu/mtk_iommu: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 12/32] iommu/exynos: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 13/32] iommu/fsl_pamu: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 14/32] iommu/msm: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 15/32] iommu/mtk_v1: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 16/32] iommu/omap: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 17/32] iommu/rockchip: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 18/32] iommu/s390: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 19/32] iommu/sprd: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 20/32] iommu/sun50i: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 21/32] iommu/tegra-smmu: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 22/32] iommu/virtio: " Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 23/32] vfio: use iova_to_phys_length for efficient unmap Guanghui Feng
2026-06-04 14:27 ` Jason Gunthorpe
2026-06-03 15:17 ` [PATCH v3 24/32] iommufd: " Guanghui Feng
2026-06-04 14:26 ` Jason Gunthorpe
2026-06-03 15:17 ` [PATCH v3 25/32] iommufd/selftest: switch to iommu_iova_to_phys_length Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 26/32] drm/panfrost: switch to iova_to_phys_length Guanghui Feng
2026-06-03 15:17 ` [PATCH v3 27/32] drm/panthor: " Guanghui Feng
2026-06-03 15:18 ` [PATCH v3 28/32] iommu/io-pgtable: selftests " Guanghui Feng
2026-06-03 15:18 ` [PATCH v3 29/32] iommu/io-pgtable-arm: remove deprecated iova_to_phys wrapper Guanghui Feng
2026-06-03 15:18 ` [PATCH v3 30/32] iommu/io-pgtable-arm-v7s: " Guanghui Feng
2026-06-03 15:18 ` [PATCH v3 31/32] iommu/io-pgtable-dart: " Guanghui Feng
2026-06-03 15:18 ` [PATCH v3 32/32] iommu: remove iova_to_phys from domain_ops and io_pgtable_ops Guanghui Feng
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