[Xen-devel] [PATCH 20/23] iommu/dma-iommu: remove the mapping_error dma_map_ops method

[Christoph Hellwig <hch@xxxxxx>]

Return DMA_MAPPING_ERROR instead of 0 on a dma mapping failure and let
the core dma-mapping code handle the rest.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 arch/arm64/mm/dma-mapping.c |  7 +++----
 drivers/iommu/dma-iommu.c   | 23 ++++++++---------------
 include/linux/dma-iommu.h   |  1 -
 3 files changed, 11 insertions(+), 20 deletions(-)

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index fdc26ea5036c..4cc70029cf8d 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -397,7 +397,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t 
size,
                        return NULL;
 
                *handle = iommu_dma_map_page(dev, page, 0, iosize, ioprot);
-               if (iommu_dma_mapping_error(dev, *handle)) {
+               if (*handle == DMA_MAPPING_ERROR) {
                        if (coherent)
                                __free_pages(page, get_order(size));
                        else
@@ -414,7 +414,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t 
size,
                        return NULL;
 
                *handle = iommu_dma_map_page(dev, page, 0, iosize, ioprot);
-               if (iommu_dma_mapping_error(dev, *handle)) {
+               if (*handle == DMA_MAPPING_ERROR) {
                        dma_release_from_contiguous(dev, page,
                                                    size >> PAGE_SHIFT);
                        return NULL;
@@ -574,7 +574,7 @@ static dma_addr_t __iommu_map_page(struct device *dev, 
struct page *page,
        dma_addr_t dev_addr = iommu_dma_map_page(dev, page, offset, size, prot);
 
        if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
-           !iommu_dma_mapping_error(dev, dev_addr))
+           dev_addr != DMA_MAPPING_ERROR)
                __dma_map_area(page_address(page) + offset, size, dir);
 
        return dev_addr;
@@ -657,7 +657,6 @@ static const struct dma_map_ops iommu_dma_ops = {
        .sync_sg_for_device = __iommu_sync_sg_for_device,
        .map_resource = iommu_dma_map_resource,
        .unmap_resource = iommu_dma_unmap_resource,
-       .mapping_error = iommu_dma_mapping_error,
 };
 
 static int __init __iommu_dma_init(void)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index d1b04753b204..60c7e9e9901e 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -32,8 +32,6 @@
 #include <linux/scatterlist.h>
 #include <linux/vmalloc.h>
 
-#define IOMMU_MAPPING_ERROR    0
-
 struct iommu_dma_msi_page {
        struct list_head        list;
        dma_addr_t              iova;
@@ -523,7 +521,7 @@ void iommu_dma_free(struct device *dev, struct page 
**pages, size_t size,
 {
        __iommu_dma_unmap(iommu_get_dma_domain(dev), *handle, size);
        __iommu_dma_free_pages(pages, PAGE_ALIGN(size) >> PAGE_SHIFT);
-       *handle = IOMMU_MAPPING_ERROR;
+       *handle = DMA_MAPPING_ERROR;
 }
 
 /**
@@ -556,7 +554,7 @@ struct page **iommu_dma_alloc(struct device *dev, size_t 
size, gfp_t gfp,
        dma_addr_t iova;
        unsigned int count, min_size, alloc_sizes = domain->pgsize_bitmap;
 
-       *handle = IOMMU_MAPPING_ERROR;
+       *handle = DMA_MAPPING_ERROR;
 
        min_size = alloc_sizes & -alloc_sizes;
        if (min_size < PAGE_SIZE) {
@@ -649,11 +647,11 @@ static dma_addr_t __iommu_dma_map(struct device *dev, 
phys_addr_t phys,
 
        iova = iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev);
        if (!iova)
-               return IOMMU_MAPPING_ERROR;
+               return DMA_MAPPING_ERROR;
 
        if (iommu_map(domain, iova, phys - iova_off, size, prot)) {
                iommu_dma_free_iova(cookie, iova, size);
-               return IOMMU_MAPPING_ERROR;
+               return DMA_MAPPING_ERROR;
        }
        return iova + iova_off;
 }
@@ -694,7 +692,7 @@ static int __finalise_sg(struct device *dev, struct 
scatterlist *sg, int nents,
 
                s->offset += s_iova_off;
                s->length = s_length;
-               sg_dma_address(s) = IOMMU_MAPPING_ERROR;
+               sg_dma_address(s) = DMA_MAPPING_ERROR;
                sg_dma_len(s) = 0;
 
                /*
@@ -737,11 +735,11 @@ static void __invalidate_sg(struct scatterlist *sg, int 
nents)
        int i;
 
        for_each_sg(sg, s, nents, i) {
-               if (sg_dma_address(s) != IOMMU_MAPPING_ERROR)
+               if (sg_dma_address(s) != DMA_MAPPING_ERROR)
                        s->offset += sg_dma_address(s);
                if (sg_dma_len(s))
                        s->length = sg_dma_len(s);
-               sg_dma_address(s) = IOMMU_MAPPING_ERROR;
+               sg_dma_address(s) = DMA_MAPPING_ERROR;
                sg_dma_len(s) = 0;
        }
 }
@@ -858,11 +856,6 @@ void iommu_dma_unmap_resource(struct device *dev, 
dma_addr_t handle,
        __iommu_dma_unmap(iommu_get_dma_domain(dev), handle, size);
 }
 
-int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
-       return dma_addr == IOMMU_MAPPING_ERROR;
-}
-
 static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
                phys_addr_t msi_addr, struct iommu_domain *domain)
 {
@@ -882,7 +875,7 @@ static struct iommu_dma_msi_page 
*iommu_dma_get_msi_page(struct device *dev,
                return NULL;
 
        iova = __iommu_dma_map(dev, msi_addr, size, prot, domain);
-       if (iommu_dma_mapping_error(dev, iova))
+       if (iova == DMA_MAPPING_ERROR)
                goto out_free_page;
 
        INIT_LIST_HEAD(&msi_page->list);
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index e8ca5e654277..e760dc5d1fa8 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -69,7 +69,6 @@ dma_addr_t iommu_dma_map_resource(struct device *dev, 
phys_addr_t phys,
                size_t size, enum dma_data_direction dir, unsigned long attrs);
 void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
                size_t size, enum dma_data_direction dir, unsigned long attrs);
-int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
 
 /* The DMA API isn't _quite_ the whole story, though... */
 void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg);
-- 
2.19.1


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