iommu/tegra241-cmdqv: Fix alignment failure at max_n_shift

JIRA: https://issues.redhat.com/browse/RHEL-67995
Upstream Status: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit a379971
Author: Nicolin Chen <nicolinc@nvidia.com>
Date:   Sun Nov 10 19:02:26 2024 -0800

    iommu/tegra241-cmdqv: Fix alignment failure at max_n_shift

    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: 918eb5c ("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>

(cherry picked from commit a379971)
Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>

Author: snits

drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c

@@ -509,7 +509,8 @@ static int tegra241_vcmdq_alloc_smmu_cmdq(struct tegra241_vcmdq *vcmdq)
 
 	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... */
 	ret = arm_smmu_init_one_queue(smmu, q, vcmdq->page0,