From: Jason Gunthorpe jgg@nvidia.com
mainline inclusion from mainline-v6.12-rc1 commit 47b2de35cab2b683f69d03515c2658c2d8515323 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IB4WDJ CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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The master->cd_table is entirely contained within the struct arm_smmu_master which is guaranteed to be freed by the core code under arm_smmu_release_device().
There is no reason to use devm here, arm_smmu_free_cd_tables() is reliably called to free the CD related memory. Remove it and save some memory.
Tested-by: Nicolin Chen nicolinc@nvidia.com Reviewed-by: Nicolin Chen nicolinc@nvidia.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Link: https://lore.kernel.org/r/5-v4-6416877274e1+1af-smmuv3_tidy_jgg@nvidia.com Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Kunkun Jiang jiangkunkun@huawei.com --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 29 +++++++++------------ 1 file changed, 13 insertions(+), 16 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 0953abb8093d..30098154f6bd 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -1409,8 +1409,8 @@ static int arm_smmu_alloc_cd_leaf_table(struct arm_smmu_device *smmu, { size_t size = CTXDESC_L2_ENTRIES * (CTXDESC_CD_DWORDS << 3);
- l1_desc->l2ptr = dmam_alloc_coherent(smmu->dev, size, - &l1_desc->l2ptr_dma, GFP_KERNEL); + l1_desc->l2ptr = dma_alloc_coherent(smmu->dev, size, + &l1_desc->l2ptr_dma, GFP_KERNEL); if (!l1_desc->l2ptr) { dev_warn(smmu->dev, "failed to allocate context descriptor table\n"); @@ -1622,17 +1622,17 @@ static int arm_smmu_alloc_cd_tables(struct arm_smmu_master *master) cd_table->num_l1_ents = DIV_ROUND_UP(max_contexts, CTXDESC_L2_ENTRIES);
- cd_table->l1_desc = devm_kcalloc(smmu->dev, cd_table->num_l1_ents, - sizeof(*cd_table->l1_desc), - GFP_KERNEL); + cd_table->l1_desc = kcalloc(cd_table->num_l1_ents, + sizeof(*cd_table->l1_desc), + GFP_KERNEL); if (!cd_table->l1_desc) return -ENOMEM;
l1size = cd_table->num_l1_ents * (CTXDESC_L1_DESC_DWORDS << 3); }
- cd_table->cdtab = dmam_alloc_coherent(smmu->dev, l1size, &cd_table->cdtab_dma, - GFP_KERNEL); + cd_table->cdtab = dma_alloc_coherent(smmu->dev, l1size, + &cd_table->cdtab_dma, GFP_KERNEL); if (!cd_table->cdtab) { dev_warn(smmu->dev, "failed to allocate context descriptor\n"); ret = -ENOMEM; @@ -1643,7 +1643,7 @@ static int arm_smmu_alloc_cd_tables(struct arm_smmu_master *master)
err_free_l1: if (cd_table->l1_desc) { - devm_kfree(smmu->dev, cd_table->l1_desc); + kfree(cd_table->l1_desc); cd_table->l1_desc = NULL; } return ret; @@ -1663,21 +1663,18 @@ static void arm_smmu_free_cd_tables(struct arm_smmu_master *master) if (!cd_table->l1_desc[i].l2ptr) continue;
- dmam_free_coherent(smmu->dev, size, - cd_table->l1_desc[i].l2ptr, - cd_table->l1_desc[i].l2ptr_dma); + dma_free_coherent(smmu->dev, size, + cd_table->l1_desc[i].l2ptr, + cd_table->l1_desc[i].l2ptr_dma); } - devm_kfree(smmu->dev, cd_table->l1_desc); - cd_table->l1_desc = NULL; + kfree(cd_table->l1_desc);
l1size = cd_table->num_l1_ents * (CTXDESC_L1_DESC_DWORDS << 3); } else { l1size = cd_table->num_l1_ents * (CTXDESC_CD_DWORDS << 3); }
- dmam_free_coherent(smmu->dev, l1size, cd_table->cdtab, cd_table->cdtab_dma); - cd_table->cdtab_dma = 0; - cd_table->cdtab = NULL; + dma_free_coherent(smmu->dev, l1size, cd_table->cdtab, cd_table->cdtab_dma); }
/* Stream table manipulation functions */