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

Christoph Hellwig
2018-11-30T13:22:28Z

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@lst.de>
---
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