linux-kernel - [PATCH 2/2] dma-iommu: Check CONFIG

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Message-Id: <20210702053742.842850-2-stevensd@google.com>
Date:   Fri,  2 Jul 2021 14:37:42 +0900
From:   David Stevens <stevensd@...omium.org>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>
Cc:     Lu Baolu <baolu.lu@...ux.intel.com>, Tom Murphy <murphyt7@....ie>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        David Stevens <stevensd@...omium.org>
Subject: [PATCH 2/2] dma-iommu: Check CONFIG_SWIOTLB more broadly

From: David Stevens <stevensd@...omium.org>

Add check for CONFIG_SWIOTLB to dev_is_untrusted, so that swiotlb
related code can be removed more aggressively.

Signed-off-by: David Stevens <stevensd@...omium.org>
---
 drivers/iommu/dma-iommu.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 24d1042cd052..614f0dd86b08 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -310,9 +310,10 @@ static void iommu_dma_flush_iotlb_all(struct iova_domain *iovad)
 	domain->ops->flush_iotlb_all(domain);
 }
 
-static bool dev_is_untrusted(struct device *dev)
+static bool dev_use_swiotlb(struct device *dev)
 {
-	return dev_is_pci(dev) && to_pci_dev(dev)->untrusted;
+	return IS_ENABLED(CONFIG_SWIOTLB) &&
+	       dev_is_pci(dev) && to_pci_dev(dev)->untrusted;
 }
 
 /**
@@ -368,7 +369,7 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
 
 	init_iova_domain(iovad, 1UL << order, base_pfn);
 
-	if (!cookie->fq_domain && (!dev || !dev_is_untrusted(dev)) &&
+	if (!cookie->fq_domain && (!dev || !dev_use_swiotlb(dev)) &&
 	    domain->ops->flush_iotlb_all && !iommu_get_dma_strict(domain)) {
 		if (init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all,
 					  iommu_dma_entry_dtor))
@@ -553,8 +554,7 @@ static dma_addr_t __iommu_dma_map_swiotlb(struct device *dev, phys_addr_t phys,
 	 * If both the physical buffer start address and size are
 	 * page aligned, we don't need to use a bounce page.
 	 */
-	if (IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev) &&
-	    iova_offset(iovad, phys | org_size)) {
+	if (dev_use_swiotlb(dev) && iova_offset(iovad, phys | org_size)) {
 		aligned_size = iova_align(iovad, org_size);
 		phys = swiotlb_tbl_map_single(dev, phys, org_size,
 					      aligned_size, dir,
@@ -779,7 +779,7 @@ static void iommu_dma_sync_single_for_cpu(struct device *dev,
 {
 	phys_addr_t phys;
 
-	if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
+	if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
 		return;
 
 	phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle);
@@ -794,7 +794,7 @@ static void __iommu_dma_sync_single_for_device(struct device *dev,
 		dma_addr_t dma_handle, size_t size,
 		enum dma_data_direction dir, phys_addr_t phys)
 {
-	if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
+	if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
 		return;
 
 	if (phys == 0)
@@ -821,10 +821,10 @@ static void iommu_dma_sync_sg_for_cpu(struct device *dev,
 	struct scatterlist *sg;
 	int i;
 
-	if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
+	if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
 		return;
 
-	if (dev_is_untrusted(dev))
+	if (dev_use_swiotlb(dev))
 		for_each_sg(sgl, sg, nelems, i)
 			iommu_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
 						      sg->length, dir);
@@ -840,10 +840,10 @@ static void iommu_dma_sync_sg_for_device(struct device *dev,
 	struct scatterlist *sg;
 	int i;
 
-	if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
+	if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev))
 		return;
 
-	if (dev_is_untrusted(dev))
+	if (dev_use_swiotlb(dev))
 		for_each_sg(sgl, sg, nelems, i)
 			__iommu_dma_sync_single_for_device(dev,
 							   sg_dma_address(sg),
@@ -1010,7 +1010,7 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
 	    iommu_deferred_attach(dev, domain))
 		return 0;
 
-	if (dev_is_untrusted(dev)) {
+	if (dev_use_swiotlb(dev)) {
 		early_mapped = iommu_dma_map_sg_swiotlb(dev, sg, nents,
 							dir, attrs);
 		if (!early_mapped)
@@ -1092,7 +1092,7 @@ static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
 		iommu_dma_sync_sg_for_cpu(dev, sg, nents, dir);
 
-	if (dev_is_untrusted(dev)) {
+	if (dev_use_swiotlb(dev)) {
 		iommu_dma_unmap_sg_swiotlb(dev, sg, nents, dir, attrs);
 		return;
 	}
-- 
2.32.0.93.g670b81a890-goog