[PATCH 7/9] vdpa: Convert to physical address DMA mapping

[Leon Romanovsky <leon@kernel.org>]

From: Leon Romanovsky <leonro@nvidia.com>

Use physical address directly in DMA mapping flow.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 drivers/vdpa/vdpa_user/iova_domain.c | 11 +++++------
 drivers/vdpa/vdpa_user/iova_domain.h |  8 ++++----
 drivers/vdpa/vdpa_user/vduse_dev.c   | 18 ++++++++++--------
 3 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/vdpa/vdpa_user/iova_domain.c b/drivers/vdpa/vdpa_user/iova_domain.c
index 58116f89d8dae..c0ecf01003cd3 100644
--- a/drivers/vdpa/vdpa_user/iova_domain.c
+++ b/drivers/vdpa/vdpa_user/iova_domain.c
@@ -396,17 +396,16 @@ void vduse_domain_sync_single_for_cpu(struct vduse_iova_domain *domain,
 	read_unlock(&domain->bounce_lock);
 }
 
-dma_addr_t vduse_domain_map_page(struct vduse_iova_domain *domain,
-				 struct page *page, unsigned long offset,
-				 size_t size, enum dma_data_direction dir,
+dma_addr_t vduse_domain_map_phys(struct vduse_iova_domain *domain,
+				 phys_addr_t pa, size_t size,
+				 enum dma_data_direction dir,
 				 unsigned long attrs)
 {
 	struct iova_domain *iovad = &domain->stream_iovad;
 	unsigned long limit = domain->bounce_size - 1;
-	phys_addr_t pa = page_to_phys(page) + offset;
 	dma_addr_t iova = vduse_domain_alloc_iova(iovad, size, limit);
 
-	if (!iova)
+	if (!iova || (attrs & DMA_ATTR_MMIO))
 		return DMA_MAPPING_ERROR;
 
 	if (vduse_domain_init_bounce_map(domain))
@@ -430,7 +429,7 @@ dma_addr_t vduse_domain_map_page(struct vduse_iova_domain *domain,
 	return DMA_MAPPING_ERROR;
 }
 
-void vduse_domain_unmap_page(struct vduse_iova_domain *domain,
+void vduse_domain_unmap_phys(struct vduse_iova_domain *domain,
 			     dma_addr_t dma_addr, size_t size,
 			     enum dma_data_direction dir, unsigned long attrs)
 {
diff --git a/drivers/vdpa/vdpa_user/iova_domain.h b/drivers/vdpa/vdpa_user/iova_domain.h
index 7f3f0928ec781..7c4546fd856ab 100644
--- a/drivers/vdpa/vdpa_user/iova_domain.h
+++ b/drivers/vdpa/vdpa_user/iova_domain.h
@@ -53,12 +53,12 @@ void vduse_domain_sync_single_for_cpu(struct vduse_iova_domain *domain,
 				      dma_addr_t dma_addr, size_t size,
 				      enum dma_data_direction dir);
 
-dma_addr_t vduse_domain_map_page(struct vduse_iova_domain *domain,
-				 struct page *page, unsigned long offset,
-				 size_t size, enum dma_data_direction dir,
+dma_addr_t vduse_domain_map_phys(struct vduse_iova_domain *domain,
+				 phys_addr_t phys, size_t size,
+				 enum dma_data_direction dir,
 				 unsigned long attrs);
 
-void vduse_domain_unmap_page(struct vduse_iova_domain *domain,
+void vduse_domain_unmap_phys(struct vduse_iova_domain *domain,
 			     dma_addr_t dma_addr, size_t size,
 			     enum dma_data_direction dir, unsigned long attrs);
 
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 04620bb77203d..75aa3c9f83fb5 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -834,25 +834,27 @@ static void vduse_dev_sync_single_for_cpu(struct device *dev,
 	vduse_domain_sync_single_for_cpu(domain, dma_addr, size, dir);
 }
 
-static dma_addr_t vduse_dev_map_page(struct device *dev, struct page *page,
-				     unsigned long offset, size_t size,
-				     enum dma_data_direction dir,
+static dma_addr_t vduse_dev_map_phys(struct device *dev, phys_addr_t phys,
+				     size_t size, enum dma_data_direction dir,
 				     unsigned long attrs)
 {
 	struct vduse_dev *vdev = dev_to_vduse(dev);
 	struct vduse_iova_domain *domain = vdev->domain;
 
-	return vduse_domain_map_page(domain, page, offset, size, dir, attrs);
+	if (attrs & DMA_ATTR_MMIO)
+		return DMA_MAPPING_ERROR;
+
+	return vduse_domain_map_phys(domain, phys, size, dir, attrs);
 }
 
-static void vduse_dev_unmap_page(struct device *dev, dma_addr_t dma_addr,
+static void vduse_dev_unmap_phys(struct device *dev, dma_addr_t dma_addr,
 				size_t size, enum dma_data_direction dir,
 				unsigned long attrs)
 {
 	struct vduse_dev *vdev = dev_to_vduse(dev);
 	struct vduse_iova_domain *domain = vdev->domain;
 
-	return vduse_domain_unmap_page(domain, dma_addr, size, dir, attrs);
+	return vduse_domain_unmap_phys(domain, dma_addr, size, dir, attrs);
 }
 
 static void *vduse_dev_alloc_coherent(struct device *dev, size_t size,
@@ -896,8 +898,8 @@ static size_t vduse_dev_max_mapping_size(struct device *dev)
 static const struct dma_map_ops vduse_dev_dma_ops = {
 	.sync_single_for_device = vduse_dev_sync_single_for_device,
 	.sync_single_for_cpu = vduse_dev_sync_single_for_cpu,
-	.map_page = vduse_dev_map_page,
-	.unmap_page = vduse_dev_unmap_page,
+	.map_phys = vduse_dev_map_phys,
+	.unmap_phys = vduse_dev_unmap_phys,
 	.alloc = vduse_dev_alloc_coherent,
 	.free = vduse_dev_free_coherent,
 	.max_mapping_size = vduse_dev_max_mapping_size,
-- 
2.51.0