linux-kernel - [PATCH v6 1/4] iommu/io-pgtable-arm: Remove arm_lpae_dump

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Message-ID: <20251103123355.1769093-2-smostafa@google.com>
Date: Mon,  3 Nov 2025 12:33:49 +0000
From: Mostafa Saleh <smostafa@...gle.com>
To: iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org
Cc: robin.murphy@....com, will@...nel.org, joro@...tes.org, jgg@...pe.ca, 
	praan@...gle.com, Mostafa Saleh <smostafa@...gle.com>
Subject: [PATCH v6 1/4] iommu/io-pgtable-arm: Remove arm_lpae_dump_ops()

At the moment, if the selftest fails it prints a lot of information
about the page table (size, levels...) this requires access to many
internals, which has to be exposed in the next patch moving the
tests out.

Instead, we can simplify the print to only print the fmt and
for each test ias, oas and pgsize_bitmap are already printed.
That is enough to identify the failed case, and the rest can
be deduced from the code.

Signed-off-by: Mostafa Saleh <smostafa@...gle.com>
---
 drivers/iommu/io-pgtable-arm.c | 41 ++++++++++++----------------------
 1 file changed, 14 insertions(+), 27 deletions(-)

diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index 7e8e2216c294..7d6d7221f540 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -1297,21 +1297,8 @@ static const struct iommu_flush_ops dummy_tlb_ops __initconst = {
 	.tlb_add_page	= dummy_tlb_add_page,
 };
 
-static void __init arm_lpae_dump_ops(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;
-
-	pr_err("cfg: pgsize_bitmap 0x%lx, ias %u-bit\n",
-		cfg->pgsize_bitmap, cfg->ias);
-	pr_err("data: %d levels, 0x%zx pgd_size, %u pg_shift, %u bits_per_level, pgd @ %p\n",
-		ARM_LPAE_MAX_LEVELS - data->start_level, ARM_LPAE_PGD_SIZE(data),
-		ilog2(ARM_LPAE_GRANULE(data)), data->bits_per_level, data->pgd);
-}
-
-#define __FAIL(ops, i)	({						\
+#define __FAIL(i) ({							\
 		WARN(1, "selftest: test failed for fmt idx %d\n", (i));	\
-		arm_lpae_dump_ops(ops);					\
 		-EFAULT;						\
 })
 
@@ -1340,13 +1327,13 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
 		 * Empty page tables shouldn't provide any translations.
 		 */
 		if (ops->iova_to_phys(ops, 42))
-			return __FAIL(ops, i);
+			return __FAIL(i);
 
 		if (ops->iova_to_phys(ops, SZ_1G + 42))
-			return __FAIL(ops, i);
+			return __FAIL(i);
 
 		if (ops->iova_to_phys(ops, SZ_2G + 42))
-			return __FAIL(ops, i);
+			return __FAIL(i);
 
 		/*
 		 * Distinct mappings of different granule sizes.
@@ -1359,16 +1346,16 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
 					   IOMMU_READ | IOMMU_WRITE |
 					   IOMMU_NOEXEC | IOMMU_CACHE,
 					   GFP_KERNEL, &mapped))
-				return __FAIL(ops, i);
+				return __FAIL(i);
 
 			/* Overlapping mappings */
 			if (!ops->map_pages(ops, iova, iova + size, size, 1,
 					    IOMMU_READ | IOMMU_NOEXEC,
 					    GFP_KERNEL, &mapped))
-				return __FAIL(ops, i);
+				return __FAIL(i);
 
 			if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
-				return __FAIL(ops, i);
+				return __FAIL(i);
 
 			iova += SZ_1G;
 		}
@@ -1379,18 +1366,18 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
 			size = 1UL << j;
 
 			if (ops->unmap_pages(ops, iova, size, 1, NULL) != size)
-				return __FAIL(ops, i);
+				return __FAIL(i);
 
 			if (ops->iova_to_phys(ops, iova + 42))
-				return __FAIL(ops, i);
+				return __FAIL(i);
 
 			/* Remap full block */
 			if (ops->map_pages(ops, iova, iova, size, 1,
 					   IOMMU_WRITE, GFP_KERNEL, &mapped))
-				return __FAIL(ops, i);
+				return __FAIL(i);
 
 			if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
-				return __FAIL(ops, i);
+				return __FAIL(i);
 
 			iova += SZ_1G;
 		}
@@ -1406,11 +1393,11 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
 				   IOMMU_READ | IOMMU_WRITE |
 				   IOMMU_NOEXEC | IOMMU_CACHE,
 				   GFP_KERNEL, &mapped))
-			return __FAIL(ops, i);
+			return __FAIL(i);
 		if (mapped != size)
-			return __FAIL(ops, i);
+			return __FAIL(i);
 		if (ops->unmap_pages(ops, iova, size, 1, NULL) != size)
-			return __FAIL(ops, i);
+			return __FAIL(i);
 
 		free_io_pgtable_ops(ops);
 	}
-- 
2.51.1.930.gacf6e81ea2-goog