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From: Guanghui Feng <guanghuifeng@linux•alibaba.com>
To: boris.brezillon@collabora•com, robh@kernel•org,
	steven.price@arm•com, adrian.larumbe@collabora•com,
	maarten.lankhorst@linux•intel.com, mripard@kernel•org,
	tzimmermann@suse•de, airlied@gmail•com, liviu.dudau@arm•com,
	joro@8bytes•org, will@kernel•org, robin.murphy@arm•com,
	alex@shazbot•org, dri-devel@lists•freedesktop.org,
	linux-kernel@vger•kernel.org, iommu@lists•linux.dev,
	kvm@vger•kernel.org, linux-arm-kernel@lists•infradead.org,
	jgg@ziepe•ca, kevin.tian@intel•com, baolu.lu@linux•intel.com,
	suravee.suthikulpanit@amd•com, dwmw2@infradead•org
Cc: xlpang@linux•alibaba.com, oliver.yang@linux•alibaba.com,
	shiyu.zsq@linux•alibaba.com, wei.guo.simon@linux•alibaba.com
Subject: [PATCH 2/9] iommu/io-pgtable: introduce iova_to_phys_length in io_pgtable_ops
Date: Sun, 31 May 2026 17:36:30 +0800	[thread overview]
Message-ID: <20260531093637.3893199-3-guanghuifeng@linux.alibaba.com> (raw)
In-Reply-To: <20260531093637.3893199-1-guanghuifeng@linux.alibaba.com>

Add iova_to_phys_length to struct io_pgtable_ops alongside iova_to_phys.
The new callback additionally returns the block/page size of the PTE
entry through the mapped_length parameter.

Implement in all three io-pgtable backends:
- ARM LPAE: returns ARM_LPAE_BLOCK_SIZE at the resolved level
- ARM v7s: returns block size derived from level mask
- DART: returns pgsize_bitmap (single fixed page size)

The old iova_to_phys is kept as a thin wrapper for backward compat.

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/io-pgtable-arm-v7s.c | 30 ++++++++++++++++++++++++------
 drivers/iommu/io-pgtable-arm.c     | 19 ++++++++++++++++++-
 drivers/iommu/io-pgtable-dart.c    | 26 +++++++++++++++++++++-----
 include/linux/io-pgtable.h         |  7 +++++++
 4 files changed, 70 insertions(+), 12 deletions(-)

diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c
index 40e33257d3c2..54e8cc673eb6 100644
--- a/drivers/iommu/io-pgtable-arm-v7s.c
+++ b/drivers/iommu/io-pgtable-arm-v7s.c
@@ -641,13 +641,25 @@ static size_t arm_v7s_unmap_pages(struct io_pgtable_ops *ops, unsigned long iova
 	return unmapped;
 }
 
+static phys_addr_t arm_v7s_iova_to_phys_length(struct io_pgtable_ops *ops,
+						unsigned long iova,
+						size_t *mapped_length);
+
 static phys_addr_t arm_v7s_iova_to_phys(struct io_pgtable_ops *ops,
 					unsigned long iova)
+{
+	return arm_v7s_iova_to_phys_length(ops, iova, NULL);
+}
+
+static phys_addr_t arm_v7s_iova_to_phys_length(struct io_pgtable_ops *ops,
+						unsigned long iova,
+						size_t *mapped_length)
 {
 	struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);
 	arm_v7s_iopte *ptep = data->pgd, pte;
 	int lvl = 0;
 	u32 mask;
+	size_t blk_size;
 
 	do {
 		ptep += ARM_V7S_LVL_IDX(iova, ++lvl, &data->iop.cfg);
@@ -661,6 +673,11 @@ static phys_addr_t arm_v7s_iova_to_phys(struct io_pgtable_ops *ops,
 	mask = ARM_V7S_LVL_MASK(lvl);
 	if (arm_v7s_pte_is_cont(pte, lvl))
 		mask *= ARM_V7S_CONT_PAGES;
+
+	blk_size = ~mask + 1U;
+	if (mapped_length)
+		*mapped_length = blk_size;
+
 	return iopte_to_paddr(pte, lvl, &data->iop.cfg) | (iova & ~mask);
 }
 
@@ -714,6 +731,7 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
 		.map_pages	= arm_v7s_map_pages,
 		.unmap_pages	= arm_v7s_unmap_pages,
 		.iova_to_phys	= arm_v7s_iova_to_phys,
+		.iova_to_phys_length	= arm_v7s_iova_to_phys_length,
 	};
 
 	/* We have to do this early for __arm_v7s_alloc_table to work... */
@@ -837,13 +855,13 @@ static int __init arm_v7s_do_selftests(void)
 	 * Initial sanity checks.
 	 * Empty page tables shouldn't provide any translations.
 	 */
-	if (ops->iova_to_phys(ops, 42))
+	if (ops->iova_to_phys_length(ops, 42, NULL))
 		return __FAIL(ops);
 
-	if (ops->iova_to_phys(ops, SZ_1G + 42))
+	if (ops->iova_to_phys_length(ops, SZ_1G + 42, NULL))
 		return __FAIL(ops);
 
-	if (ops->iova_to_phys(ops, SZ_2G + 42))
+	if (ops->iova_to_phys_length(ops, SZ_2G + 42, NULL))
 		return __FAIL(ops);
 
 	/*
@@ -864,7 +882,7 @@ static int __init arm_v7s_do_selftests(void)
 				    &mapped))
 			return __FAIL(ops);
 
-		if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
+		if (ops->iova_to_phys_length(ops, iova + 42, NULL) != (iova + 42))
 			return __FAIL(ops);
 
 		iova += SZ_16M;
@@ -878,7 +896,7 @@ static int __init arm_v7s_do_selftests(void)
 		if (ops->unmap_pages(ops, iova, size, 1, NULL) != size)
 			return __FAIL(ops);
 
-		if (ops->iova_to_phys(ops, iova + 42))
+		if (ops->iova_to_phys_length(ops, iova + 42, NULL))
 			return __FAIL(ops);
 
 		/* Remap full block */
@@ -886,7 +904,7 @@ static int __init arm_v7s_do_selftests(void)
 				   GFP_KERNEL, &mapped))
 			return __FAIL(ops);
 
-		if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
+		if (ops->iova_to_phys_length(ops, iova + 42, NULL) != (iova + 42))
 			return __FAIL(ops);
 
 		iova += SZ_16M;
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index 0208e5897c29..e2ea84669fbf 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -731,8 +731,19 @@ static int visit_iova_to_phys(struct io_pgtable_walk_data *walk_data, int lvl,
 	return 0;
 }
 
+static phys_addr_t arm_lpae_iova_to_phys_length(struct io_pgtable_ops *ops,
+						 unsigned long iova,
+						 size_t *mapped_length);
+
 static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
 					 unsigned long iova)
+{
+	return arm_lpae_iova_to_phys_length(ops, iova, NULL);
+}
+
+static phys_addr_t arm_lpae_iova_to_phys_length(struct io_pgtable_ops *ops,
+						 unsigned long iova,
+						 size_t *mapped_length)
 {
 	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
 	struct iova_to_phys_data d;
@@ -742,13 +753,18 @@ static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
 		.addr = iova,
 		.end = iova + 1,
 	};
+	size_t block_size;
 	int ret;
 
 	ret = __arm_lpae_iopte_walk(data, &walk_data, data->pgd, data->start_level);
 	if (ret)
 		return 0;
 
-	iova &= (ARM_LPAE_BLOCK_SIZE(d.lvl, data) - 1);
+	block_size = ARM_LPAE_BLOCK_SIZE(d.lvl, data);
+	if (mapped_length)
+		*mapped_length = block_size;
+
+	iova &= (block_size - 1);
 	return iopte_to_paddr(d.pte, data) | iova;
 }
 
@@ -948,6 +964,7 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
 		.map_pages	= arm_lpae_map_pages,
 		.unmap_pages	= arm_lpae_unmap_pages,
 		.iova_to_phys	= arm_lpae_iova_to_phys,
+		.iova_to_phys_length	= arm_lpae_iova_to_phys_length,
 		.read_and_clear_dirty = arm_lpae_read_and_clear_dirty,
 		.pgtable_walk	= arm_lpae_pgtable_walk,
 	};
diff --git a/drivers/iommu/io-pgtable-dart.c b/drivers/iommu/io-pgtable-dart.c
index cbc5d6aa2daa..fa250f5d16ed 100644
--- a/drivers/iommu/io-pgtable-dart.c
+++ b/drivers/iommu/io-pgtable-dart.c
@@ -333,11 +333,23 @@ static size_t dart_unmap_pages(struct io_pgtable_ops *ops, unsigned long iova,
 	return i * pgsize;
 }
 
+static phys_addr_t dart_iova_to_phys_length(struct io_pgtable_ops *ops,
+					    unsigned long iova,
+					    size_t *mapped_length);
+
 static phys_addr_t dart_iova_to_phys(struct io_pgtable_ops *ops,
-					 unsigned long iova)
+				     unsigned long iova)
+{
+	return dart_iova_to_phys_length(ops, iova, NULL);
+}
+
+static phys_addr_t dart_iova_to_phys_length(struct io_pgtable_ops *ops,
+					    unsigned long iova,
+					    size_t *mapped_length)
 {
 	struct dart_io_pgtable *data = io_pgtable_ops_to_data(ops);
 	dart_iopte pte, *ptep;
+	size_t pgsize;
 
 	ptep = dart_get_last(data, iova);
 
@@ -350,7 +362,10 @@ static phys_addr_t dart_iova_to_phys(struct io_pgtable_ops *ops,
 	pte = READ_ONCE(*ptep);
 	/* Found translation */
 	if (pte) {
-		iova &= (data->iop.cfg.pgsize_bitmap - 1);
+		pgsize = data->iop.cfg.pgsize_bitmap;
+		if (mapped_length)
+			*mapped_length = pgsize;
+		iova &= (pgsize - 1);
 		return iopte_to_paddr(pte, data) | iova;
 	}
 
@@ -397,9 +412,10 @@ dart_alloc_pgtable(struct io_pgtable_cfg *cfg)
 	data->bits_per_level = bits_per_level;
 
 	data->iop.ops = (struct io_pgtable_ops) {
-		.map_pages	= dart_map_pages,
-		.unmap_pages	= dart_unmap_pages,
-		.iova_to_phys	= dart_iova_to_phys,
+		.map_pages		= dart_map_pages,
+		.unmap_pages		= dart_unmap_pages,
+		.iova_to_phys		= dart_iova_to_phys,
+		.iova_to_phys_length	= dart_iova_to_phys_length,
 	};
 
 	return data;
diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
index e19872e37e06..42bcdd309b88 100644
--- a/include/linux/io-pgtable.h
+++ b/include/linux/io-pgtable.h
@@ -203,6 +203,10 @@ struct arm_lpae_io_pgtable_walk_data {
  * @map_pages:    Map a physically contiguous range of pages of the same size.
  * @unmap_pages:  Unmap a range of virtually contiguous pages of the same size.
  * @iova_to_phys: Translate iova to physical address.
+ * @iova_to_phys_length: Translate iova to physical address and return the
+ *			  remaining mapped length from iova to the end of the
+ *			  mapping entry via @mapped_length. If @mapped_length is
+ *			  NULL, only the physical address is returned.
  * @pgtable_walk: (optional) Perform a page table walk for a given iova.
  * @read_and_clear_dirty: Record dirty info per IOVA. If an IOVA is dirty,
  *			  clear its dirty state from the PTE unless the
@@ -220,6 +224,9 @@ struct io_pgtable_ops {
 			      struct iommu_iotlb_gather *gather);
 	phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
 				    unsigned long iova);
+	phys_addr_t (*iova_to_phys_length)(struct io_pgtable_ops *ops,
+					   unsigned long iova,
+					   size_t *mapped_length);
 	int (*pgtable_walk)(struct io_pgtable_ops *ops, unsigned long iova, void *wd);
 	int (*read_and_clear_dirty)(struct io_pgtable_ops *ops,
 				    unsigned long iova, size_t size,
-- 
2.43.7



  parent reply	other threads:[~2026-05-31  9:37 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   ` Guanghui Feng [this message]
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       ` [PATCH v3 01/32] iommu: introduce iova_to_phys_length in iommu_domain_ops Guanghui Feng
2026-06-04  2:44         ` 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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