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iommu/tegra241-cmdqv: Fix alignment failure at max_n_shift

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When configuring a kernel with PAGE_SIZE=4KB, depending on its setting of
CONFIG_CMA_ALIGNMENT, VCMDQ_LOG2SIZE_MAX=19 could fail the alignment test
and trigger a WARN_ON:
    WARNING: at drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c:3646
    Call trace:
     arm_smmu_init_one_queue+0x15c/0x210
     tegra241_cmdqv_init_structures+0x114/0x338
     arm_smmu_device_probe+0xb48/0x1d90

Fix it by capping max_n_shift to CMDQ_MAX_SZ_SHIFT as SMMUv3 CMDQ does.

Fixes: 918eb5c856 ("iommu/arm-smmu-v3: Add in-kernel support for NVIDIA Tegra241 (Grace) CMDQV")
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/20241111030226.1940737-1-nicolinc@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Nicolin Chen
2024-11-10 19:02:26 -08:00
committed by Will Deacon
parent 6ac7dffe7c
commit a3799717b8
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
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@@ -509,7 +509,8 @@ static int tegra241_vcmdq_alloc_smmu_cmdq(struct tegra241_vcmdq *vcmdq)
snprintf(name, 16, "vcmdq%u", vcmdq->idx); snprintf(name, 16, "vcmdq%u", vcmdq->idx);
q->llq.max_n_shift = VCMDQ_LOG2SIZE_MAX; /* Queue size, capped to ensure natural alignment */
q->llq.max_n_shift = min_t(u32, CMDQ_MAX_SZ_SHIFT, VCMDQ_LOG2SIZE_MAX);
/* Use the common helper to init the VCMDQ, and then... */ /* Use the common helper to init the VCMDQ, and then... */
ret = arm_smmu_init_one_queue(smmu, q, vcmdq->page0, ret = arm_smmu_init_one_queue(smmu, q, vcmdq->page0,