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Message-ID: <20241210165127.600817-2-robdclark@gmail.com>
Date: Tue, 10 Dec 2024 08:51:19 -0800
From: Rob Clark <robdclark@...il.com>
To: iommu@...ts.linux.dev
Cc: linux-arm-msm@...r.kernel.org,
freedreno@...ts.freedesktop.org,
Mostafa Saleh <smostafa@...gle.com>,
Will Deacon <will@...nel.org>,
Rob Clark <robdclark@...omium.org>,
Robin Murphy <robin.murphy@....com>,
Joerg Roedel <joro@...tes.org>,
linux-arm-kernel@...ts.infradead.org (moderated list:ARM SMMU DRIVERS),
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v11 1/4] iommu/io-pgtable-arm: Make pgtable walker more generic
From: Rob Clark <robdclark@...omium.org>
We can re-use this basic pgtable walk logic in a few places.
Signed-off-by: Rob Clark <robdclark@...omium.org>
Reviewed-by: Mostafa Saleh <smostafa@...gle.com>
---
drivers/iommu/io-pgtable-arm.c | 67 ++++++++++++++++++++++------------
1 file changed, 43 insertions(+), 24 deletions(-)
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index 0e67f1721a3d..7e9c0f8ae138 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -749,33 +749,33 @@ static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
}
struct io_pgtable_walk_data {
- struct iommu_dirty_bitmap *dirty;
+ struct io_pgtable *iop;
+ void *data;
+ int (*visit)(struct io_pgtable_walk_data *walk_data, int lvl,
+ arm_lpae_iopte *ptep, size_t size);
unsigned long flags;
u64 addr;
const u64 end;
};
-static int __arm_lpae_iopte_walk_dirty(struct arm_lpae_io_pgtable *data,
- struct io_pgtable_walk_data *walk_data,
- arm_lpae_iopte *ptep,
- int lvl);
+static int __arm_lpae_iopte_walk(struct arm_lpae_io_pgtable *data,
+ struct io_pgtable_walk_data *walk_data,
+ arm_lpae_iopte *ptep,
+ int lvl);
-static int io_pgtable_visit_dirty(struct arm_lpae_io_pgtable *data,
- struct io_pgtable_walk_data *walk_data,
- arm_lpae_iopte *ptep, int lvl)
+static int io_pgtable_visit(struct arm_lpae_io_pgtable *data,
+ struct io_pgtable_walk_data *walk_data,
+ arm_lpae_iopte *ptep, int lvl)
{
struct io_pgtable *iop = &data->iop;
arm_lpae_iopte pte = READ_ONCE(*ptep);
- if (iopte_leaf(pte, lvl, iop->fmt)) {
- size_t size = ARM_LPAE_BLOCK_SIZE(lvl, data);
+ size_t size = ARM_LPAE_BLOCK_SIZE(lvl, data);
+ int ret = walk_data->visit(walk_data, lvl, ptep, size);
+ if (ret)
+ return ret;
- if (iopte_writeable_dirty(pte)) {
- iommu_dirty_bitmap_record(walk_data->dirty,
- walk_data->addr, size);
- if (!(walk_data->flags & IOMMU_DIRTY_NO_CLEAR))
- iopte_set_writeable_clean(ptep);
- }
+ if (iopte_leaf(pte, lvl, iop->fmt)) {
walk_data->addr += size;
return 0;
}
@@ -784,13 +784,13 @@ static int io_pgtable_visit_dirty(struct arm_lpae_io_pgtable *data,
return -EINVAL;
ptep = iopte_deref(pte, data);
- return __arm_lpae_iopte_walk_dirty(data, walk_data, ptep, lvl + 1);
+ return __arm_lpae_iopte_walk(data, walk_data, ptep, lvl + 1);
}
-static int __arm_lpae_iopte_walk_dirty(struct arm_lpae_io_pgtable *data,
- struct io_pgtable_walk_data *walk_data,
- arm_lpae_iopte *ptep,
- int lvl)
+static int __arm_lpae_iopte_walk(struct arm_lpae_io_pgtable *data,
+ struct io_pgtable_walk_data *walk_data,
+ arm_lpae_iopte *ptep,
+ int lvl)
{
u32 idx;
int max_entries, ret;
@@ -805,7 +805,7 @@ static int __arm_lpae_iopte_walk_dirty(struct arm_lpae_io_pgtable *data,
for (idx = ARM_LPAE_LVL_IDX(walk_data->addr, lvl, data);
(idx < max_entries) && (walk_data->addr < walk_data->end); ++idx) {
- ret = io_pgtable_visit_dirty(data, walk_data, ptep + idx, lvl);
+ ret = io_pgtable_visit(data, walk_data, ptep + idx, lvl);
if (ret)
return ret;
}
@@ -813,6 +813,23 @@ static int __arm_lpae_iopte_walk_dirty(struct arm_lpae_io_pgtable *data,
return 0;
}
+static int visit_dirty(struct io_pgtable_walk_data *walk_data, int lvl,
+ arm_lpae_iopte *ptep, size_t size)
+{
+ struct iommu_dirty_bitmap *dirty = walk_data->data;
+
+ if (!iopte_leaf(*ptep, lvl, walk_data->iop->fmt))
+ return 0;
+
+ if (iopte_writeable_dirty(*ptep)) {
+ iommu_dirty_bitmap_record(dirty, walk_data->addr, size);
+ if (!(walk_data->flags & IOMMU_DIRTY_NO_CLEAR))
+ iopte_set_writeable_clean(ptep);
+ }
+
+ return 0;
+}
+
static int arm_lpae_read_and_clear_dirty(struct io_pgtable_ops *ops,
unsigned long iova, size_t size,
unsigned long flags,
@@ -821,7 +838,9 @@ static int arm_lpae_read_and_clear_dirty(struct io_pgtable_ops *ops,
struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
struct io_pgtable_cfg *cfg = &data->iop.cfg;
struct io_pgtable_walk_data walk_data = {
- .dirty = dirty,
+ .iop = &data->iop,
+ .data = dirty,
+ .visit = visit_dirty,
.flags = flags,
.addr = iova,
.end = iova + size,
@@ -836,7 +855,7 @@ static int arm_lpae_read_and_clear_dirty(struct io_pgtable_ops *ops,
if (data->iop.fmt != ARM_64_LPAE_S1)
return -EINVAL;
- return __arm_lpae_iopte_walk_dirty(data, &walk_data, ptep, lvl);
+ return __arm_lpae_iopte_walk(data, &walk_data, ptep, lvl);
}
static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg)
--
2.47.1
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