[PATCH 0/2] Some improvements for iommu

[PATCH 0/2] Some improvements for iommu

[Baolin Wang]

Hi,

The first patch masks some functions as static, and the second patch
changes to use the gfp parameter from iommu_ops->map() to allocate
ARM page pages. Any comments are welcome. Thanks.

Baolin Wang (2):
  iommu: Mark __iommu_map/__iommu_map_sg as static
  iommu: Add gfp parameter to io_pgtable_ops->map()

 drivers/gpu/drm/panfrost/panfrost_mmu.c |  2 +-
 drivers/iommu/arm-smmu-v3.c             |  2 +-
 drivers/iommu/arm-smmu.c                |  2 +-
 drivers/iommu/io-pgtable-arm-v7s.c      | 10 +++++-----
 drivers/iommu/io-pgtable-arm.c          | 10 +++++-----
 drivers/iommu/iommu.c                   | 10 +++++-----
 drivers/iommu/ipmmu-vmsa.c              |  2 +-
 drivers/iommu/msm_iommu.c               |  2 +-
 drivers/iommu/mtk_iommu.c               |  2 +-
 drivers/iommu/qcom_iommu.c              |  2 +-
 include/linux/io-pgtable.h              |  2 +-
 11 files changed, 23 insertions(+), 23 deletions(-)

-- 
1.8.3.1

[PATCH 1/2] iommu: Mark __iommu_map/__iommu_map_sg as static

[Baolin Wang]

Now the __iommu_map() and __iommu_map_sg() are used only in iommu.c
file, so mark them as static.

Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
 drivers/iommu/iommu.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index ac91024..04ba8f7 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1924,8 +1924,8 @@ static size_t iommu_pgsize(struct iommu_domain *domain,
 	return pgsize;
 }
 
-int __iommu_map(struct iommu_domain *domain, unsigned long iova,
-	      phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
+static int __iommu_map(struct iommu_domain *domain, unsigned long iova,
+		       phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
 {
 	const struct iommu_ops *ops = domain->ops;
 	unsigned long orig_iova = iova;
@@ -2075,9 +2075,9 @@ size_t iommu_unmap_fast(struct iommu_domain *domain,
 }
 EXPORT_SYMBOL_GPL(iommu_unmap_fast);
 
-size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
-		    struct scatterlist *sg, unsigned int nents, int prot,
-		    gfp_t gfp)
+static size_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
+			     struct scatterlist *sg, unsigned int nents, int prot,
+			     gfp_t gfp)
 {
 	size_t len = 0, mapped = 0;
 	phys_addr_t start;
-- 
1.8.3.1

[PATCH 2/2] iommu: Add gfp parameter to io_pgtable_ops->map()

[Baolin Wang]

Now the ARM page tables are always allocated by GFP_ATOMIC parameter,
but the iommu_ops->map() function has been added a gfp_t parameter by
commit 781ca2de89ba ("iommu: Add gfp parameter to iommu_ops::map"),
thus io_pgtable_ops->map() should use the gfp parameter passed from
iommu_ops->map() to allocate page pages, which can avoid wasting the
memory allocators atomic pools for some non-atomic contexts.

Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
 drivers/gpu/drm/panfrost/panfrost_mmu.c |  2 +-
 drivers/iommu/arm-smmu-v3.c             |  2 +-
 drivers/iommu/arm-smmu.c                |  2 +-
 drivers/iommu/io-pgtable-arm-v7s.c      | 10 +++++-----
 drivers/iommu/io-pgtable-arm.c          | 10 +++++-----
 drivers/iommu/ipmmu-vmsa.c              |  2 +-
 drivers/iommu/msm_iommu.c               |  2 +-
 drivers/iommu/mtk_iommu.c               |  2 +-
 drivers/iommu/qcom_iommu.c              |  2 +-
 include/linux/io-pgtable.h              |  2 +-
 10 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index ed28aeb..5a39eee 100644
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -262,7 +262,7 @@ static int mmu_map_sg(struct panfrost_device *pfdev, struct panfrost_mmu *mmu,
 		while (len) {
 			size_t pgsize = get_pgsize(iova | paddr, len);
 
-			ops->map(ops, iova, paddr, pgsize, prot);
+			ops->map(ops, iova, paddr, pgsize, prot, GFP_KERNEL);
 			iova += pgsize;
 			paddr += pgsize;
 			len -= pgsize;
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 8250873..433b680 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2845,7 +2845,7 @@ static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
 	if (!ops)
 		return -ENODEV;
 
-	return ops->map(ops, iova, paddr, size, prot);
+	return ops->map(ops, iova, paddr, size, prot, gfp);
 }
 
 static size_t arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index a6a5796..bf640aa 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1237,7 +1237,7 @@ static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
 		return -ENODEV;
 
 	arm_smmu_rpm_get(smmu);
-	ret = ops->map(ops, iova, paddr, size, prot);
+	ret = ops->map(ops, iova, paddr, size, prot, gfp);
 	arm_smmu_rpm_put(smmu);
 
 	return ret;
diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c
index 4272fe4..ebbe2c5 100644
--- a/drivers/iommu/io-pgtable-arm-v7s.c
+++ b/drivers/iommu/io-pgtable-arm-v7s.c
@@ -470,7 +470,7 @@ static arm_v7s_iopte arm_v7s_install_table(arm_v7s_iopte *table,
 
 static int __arm_v7s_map(struct arm_v7s_io_pgtable *data, unsigned long iova,
 			 phys_addr_t paddr, size_t size, int prot,
-			 int lvl, arm_v7s_iopte *ptep)
+			 int lvl, arm_v7s_iopte *ptep, gfp_t gfp)
 {
 	struct io_pgtable_cfg *cfg = &data->iop.cfg;
 	arm_v7s_iopte pte, *cptep;
@@ -491,7 +491,7 @@ static int __arm_v7s_map(struct arm_v7s_io_pgtable *data, unsigned long iova,
 	/* Grab a pointer to the next level */
 	pte = READ_ONCE(*ptep);
 	if (!pte) {
-		cptep = __arm_v7s_alloc_table(lvl + 1, GFP_ATOMIC, data);
+		cptep = __arm_v7s_alloc_table(lvl + 1, gfp, data);
 		if (!cptep)
 			return -ENOMEM;
 
@@ -512,11 +512,11 @@ static int __arm_v7s_map(struct arm_v7s_io_pgtable *data, unsigned long iova,
 	}
 
 	/* Rinse, repeat */
-	return __arm_v7s_map(data, iova, paddr, size, prot, lvl + 1, cptep);
+	return __arm_v7s_map(data, iova, paddr, size, prot, lvl + 1, cptep, gfp);
 }
 
 static int arm_v7s_map(struct io_pgtable_ops *ops, unsigned long iova,
-			phys_addr_t paddr, size_t size, int prot)
+			phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
 {
 	struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);
 	struct io_pgtable *iop = &data->iop;
@@ -530,7 +530,7 @@ static int arm_v7s_map(struct io_pgtable_ops *ops, unsigned long iova,
 		    paddr >= (1ULL << data->iop.cfg.oas)))
 		return -ERANGE;
 
-	ret = __arm_v7s_map(data, iova, paddr, size, prot, 1, data->pgd);
+	ret = __arm_v7s_map(data, iova, paddr, size, prot, 1, data->pgd, gfp);
 	/*
 	 * Synchronise all PTE updates for the new mapping before there's
 	 * a chance for anything to kick off a table walk for the new iova.
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index 04fbd4b..3ced132 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -355,7 +355,7 @@ static arm_lpae_iopte arm_lpae_install_table(arm_lpae_iopte *table,
 
 static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
 			  phys_addr_t paddr, size_t size, arm_lpae_iopte prot,
-			  int lvl, arm_lpae_iopte *ptep)
+			  int lvl, arm_lpae_iopte *ptep, gfp_t gfp)
 {
 	arm_lpae_iopte *cptep, pte;
 	size_t block_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
@@ -376,7 +376,7 @@ static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
 	/* Grab a pointer to the next level */
 	pte = READ_ONCE(*ptep);
 	if (!pte) {
-		cptep = __arm_lpae_alloc_pages(tblsz, GFP_ATOMIC, cfg);
+		cptep = __arm_lpae_alloc_pages(tblsz, gfp, cfg);
 		if (!cptep)
 			return -ENOMEM;
 
@@ -396,7 +396,7 @@ static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
 	}
 
 	/* Rinse, repeat */
-	return __arm_lpae_map(data, iova, paddr, size, prot, lvl + 1, cptep);
+	return __arm_lpae_map(data, iova, paddr, size, prot, lvl + 1, cptep, gfp);
 }
 
 static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
@@ -461,7 +461,7 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
 }
 
 static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
-			phys_addr_t paddr, size_t size, int iommu_prot)
+			phys_addr_t paddr, size_t size, int iommu_prot, gfp_t gfp)
 {
 	struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
 	struct io_pgtable_cfg *cfg = &data->iop.cfg;
@@ -483,7 +483,7 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
 		return -ERANGE;
 
 	prot = arm_lpae_prot_to_pte(data, iommu_prot);
-	ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep);
+	ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep, gfp);
 	/*
 	 * Synchronise all PTE updates for the new mapping before there's
 	 * a chance for anything to kick off a table walk for the new iova.
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index 310cf09..391d7f1 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -687,7 +687,7 @@ static int ipmmu_map(struct iommu_domain *io_domain, unsigned long iova,
 	if (!domain)
 		return -ENODEV;
 
-	return domain->iop->map(domain->iop, iova, paddr, size, prot);
+	return domain->iop->map(domain->iop, iova, paddr, size, prot, gfp);
 }
 
 static size_t ipmmu_unmap(struct iommu_domain *io_domain, unsigned long iova,
diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index 94a6df1..f3057f9 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -511,7 +511,7 @@ static int msm_iommu_map(struct iommu_domain *domain, unsigned long iova,
 	int ret;
 
 	spin_lock_irqsave(&priv->pgtlock, flags);
-	ret = priv->iop->map(priv->iop, iova, pa, len, prot);
+	ret = priv->iop->map(priv->iop, iova, pa, len, prot, GFP_ATOMIC);
 	spin_unlock_irqrestore(&priv->pgtlock, flags);
 
 	return ret;
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 5f4d6df..1593801 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -397,7 +397,7 @@ static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,
 		paddr |= BIT_ULL(32);
 
 	/* Synchronize with the tlb_lock */
-	return dom->iop->map(dom->iop, iova, paddr, size, prot);
+	return dom->iop->map(dom->iop, iova, paddr, size, prot, gfp);
 }
 
 static size_t mtk_iommu_unmap(struct iommu_domain *domain,
diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
index 5b3b270..2c4c5d7 100644
--- a/drivers/iommu/qcom_iommu.c
+++ b/drivers/iommu/qcom_iommu.c
@@ -441,7 +441,7 @@ static int qcom_iommu_map(struct iommu_domain *domain, unsigned long iova,
 		return -ENODEV;
 
 	spin_lock_irqsave(&qcom_domain->pgtbl_lock, flags);
-	ret = ops->map(ops, iova, paddr, size, prot);
+	ret = ops->map(ops, iova, paddr, size, prot, GFP_ATOMIC);
 	spin_unlock_irqrestore(&qcom_domain->pgtbl_lock, flags);
 	return ret;
 }
diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
index 53d53c6..23285ba 100644
--- a/include/linux/io-pgtable.h
+++ b/include/linux/io-pgtable.h
@@ -155,7 +155,7 @@ struct io_pgtable_cfg {
  */
 struct io_pgtable_ops {
 	int (*map)(struct io_pgtable_ops *ops, unsigned long iova,
-		   phys_addr_t paddr, size_t size, int prot);
+		   phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
 	size_t (*unmap)(struct io_pgtable_ops *ops, unsigned long iova,
 			size_t size, struct iommu_iotlb_gather *gather);
 	phys_addr_t (*iova_to_phys)(struct io_pgtable_ops *ops,
-- 
1.8.3.1