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 3/9] iommu/generic_pt: implement iova_to_phys_length
Date: Sun, 31 May 2026 17:36:31 +0800 [thread overview]
Message-ID: <20260531093637.3893199-4-guanghuifeng@linux.alibaba.com> (raw)
In-Reply-To: <20260531093637.3893199-1-guanghuifeng@linux.alibaba.com>
Extend the Generic Page Table framework to implement iova_to_phys_length.
Use pt_entry_oa_lg2sz() to determine PTE block size. Update
IOMMU_PT_DOMAIN_OPS macro to set .iova_to_phys_length.
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/generic_pt/iommu_pt.h | 49 ++++++++++++++++++-----------
include/linux/generic_pt/iommu.h | 13 ++++----
2 files changed, 37 insertions(+), 25 deletions(-)
diff --git a/drivers/iommu/generic_pt/iommu_pt.h b/drivers/iommu/generic_pt/iommu_pt.h
index dc91fb4e2f61..b4213b4947f2 100644
--- a/drivers/iommu/generic_pt/iommu_pt.h
+++ b/drivers/iommu/generic_pt/iommu_pt.h
@@ -145,13 +145,18 @@ static inline unsigned int compute_best_pgsize(struct pt_state *pts,
pts->range->va, pts->range->last_va, oa);
}
-static __always_inline int __do_iova_to_phys(struct pt_range *range, void *arg,
- unsigned int level,
- struct pt_table_p *table,
- pt_level_fn_t descend_fn)
+struct iova_to_phys_length_data {
+ pt_oaddr_t phys;
+ size_t length;
+};
+
+static __always_inline int __do_iova_to_phys_length(struct pt_range *range,
+ void *arg, unsigned int level,
+ struct pt_table_p *table,
+ pt_level_fn_t descend_fn)
{
struct pt_state pts = pt_init(range, level, table);
- pt_oaddr_t *res = arg;
+ struct iova_to_phys_length_data *data = arg;
switch (pt_load_single_entry(&pts)) {
case PT_ENTRY_EMPTY:
@@ -159,45 +164,51 @@ static __always_inline int __do_iova_to_phys(struct pt_range *range, void *arg,
case PT_ENTRY_TABLE:
return pt_descend(&pts, arg, descend_fn);
case PT_ENTRY_OA:
- *res = pt_entry_oa_exact(&pts);
+ data->phys = pt_entry_oa_exact(&pts);
+ data->length = BIT(pt_entry_oa_lg2sz(&pts));
return 0;
}
return -ENOENT;
}
-PT_MAKE_LEVELS(__iova_to_phys, __do_iova_to_phys);
+PT_MAKE_LEVELS(__iova_to_phys_length, __do_iova_to_phys_length);
/**
- * iova_to_phys() - Return the output address for the given IOVA
+ * iova_to_phys_length() - Translate IOVA returning both phys and page size
* @domain: Table to query
* @iova: IO virtual address to query
+ * @mapped_length: Output for the PTE page size in bytes
*
- * Determine the output address from the given IOVA. @iova may have any
- * alignment, the returned physical will be adjusted with any sub page offset.
+ * Walk the IOMMU page table to translate @iova to a physical address while
+ * also returning the page size of the PTE entry through @mapped_length.
+ * This combines iova_to_phys and page size query into a single page table walk.
*
* Context: The caller must hold a read range lock that includes @iova.
*
- * Return: 0 if there is no translation for the given iova.
+ * Return: The physical address, or 0 if there is no translation.
*/
-phys_addr_t DOMAIN_NS(iova_to_phys)(struct iommu_domain *domain,
- dma_addr_t iova)
+phys_addr_t DOMAIN_NS(iova_to_phys_length)(struct iommu_domain *domain,
+ dma_addr_t iova,
+ size_t *mapped_length)
{
struct pt_iommu *iommu_table =
container_of(domain, struct pt_iommu, domain);
struct pt_range range;
- pt_oaddr_t res;
+ struct iova_to_phys_length_data data;
int ret;
ret = make_range(common_from_iommu(iommu_table), &range, iova, 1);
if (ret)
- return ret;
+ return 0;
- ret = pt_walk_range(&range, __iova_to_phys, &res);
- /* PHYS_ADDR_MAX would be a better error code */
+ ret = pt_walk_range(&range, __iova_to_phys_length, &data);
if (ret)
return 0;
- return res;
+
+ if (mapped_length)
+ *mapped_length = data.length;
+ return data.phys;
}
-EXPORT_SYMBOL_NS_GPL(DOMAIN_NS(iova_to_phys), "GENERIC_PT_IOMMU");
+EXPORT_SYMBOL_NS_GPL(DOMAIN_NS(iova_to_phys_length), "GENERIC_PT_IOMMU");
struct pt_iommu_dirty_args {
struct iommu_dirty_bitmap *dirty;
diff --git a/include/linux/generic_pt/iommu.h b/include/linux/generic_pt/iommu.h
index dd0edd02a48a..859b853e9dc7 100644
--- a/include/linux/generic_pt/iommu.h
+++ b/include/linux/generic_pt/iommu.h
@@ -249,8 +249,9 @@ struct pt_iommu_cfg {
/* Generate the exported function signatures from iommu_pt.h */
#define IOMMU_PROTOTYPES(fmt) \
- phys_addr_t pt_iommu_##fmt##_iova_to_phys(struct iommu_domain *domain, \
- dma_addr_t iova); \
+ phys_addr_t pt_iommu_##fmt##_iova_to_phys_length( \
+ struct iommu_domain *domain, dma_addr_t iova, \
+ size_t *mapped_length); \
int pt_iommu_##fmt##_read_and_clear_dirty( \
struct iommu_domain *domain, unsigned long iova, size_t size, \
unsigned long flags, struct iommu_dirty_bitmap *dirty); \
@@ -267,11 +268,11 @@ struct pt_iommu_cfg {
IOMMU_PROTOTYPES(fmt)
/*
- * A driver uses IOMMU_PT_DOMAIN_OPS to populate the iommu_domain_ops for the
- * iommu_pt
+ * A driver uses IOMMU_PT_DOMAIN_OPS to populate the iommu_domain_ops for
+ * the iommu_pt
*/
-#define IOMMU_PT_DOMAIN_OPS(fmt) \
- .iova_to_phys = &pt_iommu_##fmt##_iova_to_phys
+#define IOMMU_PT_DOMAIN_OPS(fmt) \
+ .iova_to_phys_length = &pt_iommu_##fmt##_iova_to_phys_length
#define IOMMU_PT_DIRTY_OPS(fmt) \
.read_and_clear_dirty = &pt_iommu_##fmt##_read_and_clear_dirty
--
2.43.7
next prev 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 ` [PATCH 2/9] iommu/io-pgtable: introduce iova_to_phys_length in io_pgtable_ops Guanghui Feng
2026-05-31 9:36 ` Guanghui Feng [this message]
2026-05-31 23:54 ` [PATCH 3/9] iommu/generic_pt: implement iova_to_phys_length 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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