[PATCH 03/23] arm: remove the mapping_error dma_map_ops method

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

Arm already returns (~(dma_addr_t)0x0) on mapping failures, so we can
switch over to returning DMA_MAPPING_ERROR and let the core dma-mapping
code handle the rest.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/arm/common/dmabounce.c | 12 +++-------
arch/arm/include/asm/dma-iommu.h | 2 --
arch/arm/mm/dma-mapping.c | 39 ++++++++++++--------------------
3 files changed, 18 insertions(+), 35 deletions(-)

diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index 9a92de63426f..5ba4622030ca 100644
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -257,7 +257,7 @@ static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
if (buf = NULL) {
dev_err(dev, "%s: unable to map unsafe buffer %p!\n",
__func__, ptr);
- return ARM_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
@@ -327,7 +327,7 @@ static dma_addr_t dmabounce_map_page(struct device *dev, struct page *page,

ret = needs_bounce(dev, dma_addr, size);
if (ret < 0)
- return ARM_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;

if (ret = 0) {
arm_dma_ops.sync_single_for_device(dev, dma_addr, size, dir);
@@ -336,7 +336,7 @@ static dma_addr_t dmabounce_map_page(struct device *dev, struct page *page,

if (PageHighMem(page)) {
dev_err(dev, "DMA buffer bouncing of HIGHMEM pages is not supported\n");
- return ARM_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

return map_single(dev, page_address(page) + offset, size, dir, attrs);
@@ -453,11 +453,6 @@ static int dmabounce_dma_supported(struct device *dev, u64 dma_mask)
return arm_dma_ops.dma_supported(dev, dma_mask);
}

-static int dmabounce_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return arm_dma_ops.mapping_error(dev, dma_addr);
-}
-
static const struct dma_map_ops dmabounce_ops = {
.alloc = arm_dma_alloc,
.free = arm_dma_free,
@@ -472,7 +467,6 @@ static const struct dma_map_ops dmabounce_ops = {
.sync_sg_for_cpu = arm_dma_sync_sg_for_cpu,
.sync_sg_for_device = arm_dma_sync_sg_for_device,
.dma_supported = dmabounce_dma_supported,
- .mapping_error = dmabounce_mapping_error,
};

static int dmabounce_init_pool(struct dmabounce_pool *pool, struct device *dev,
diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h
index 6821f1249300..772f48ef84b7 100644
--- a/arch/arm/include/asm/dma-iommu.h
+++ b/arch/arm/include/asm/dma-iommu.h
@@ -9,8 +9,6 @@
#include <linux/dma-debug.h>
#include <linux/kref.h>

-#define ARM_MAPPING_ERROR (~(dma_addr_t)0x0)
-
struct dma_iommu_mapping {
/* iommu specific data */
struct iommu_domain *domain;
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 661fe48ab78d..2cfb17bad1e6 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -179,11 +179,6 @@ static void arm_dma_sync_single_for_device(struct device *dev,
__dma_page_cpu_to_dev(page, offset, size, dir);
}

-static int arm_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr = ARM_MAPPING_ERROR;
-}
-
const struct dma_map_ops arm_dma_ops = {
.alloc = arm_dma_alloc,
.free = arm_dma_free,
@@ -197,7 +192,6 @@ const struct dma_map_ops arm_dma_ops = {
.sync_single_for_device = arm_dma_sync_single_for_device,
.sync_sg_for_cpu = arm_dma_sync_sg_for_cpu,
.sync_sg_for_device = arm_dma_sync_sg_for_device,
- .mapping_error = arm_dma_mapping_error,
.dma_supported = arm_dma_supported,
};
EXPORT_SYMBOL(arm_dma_ops);
@@ -217,7 +211,6 @@ const struct dma_map_ops arm_coherent_dma_ops = {
.get_sgtable = arm_dma_get_sgtable,
.map_page = arm_coherent_dma_map_page,
.map_sg = arm_dma_map_sg,
- .mapping_error = arm_dma_mapping_error,
.dma_supported = arm_dma_supported,
};
EXPORT_SYMBOL(arm_coherent_dma_ops);
@@ -774,7 +767,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
gfp &= ~(__GFP_COMP);
args.gfp = gfp;

- *handle = ARM_MAPPING_ERROR;
+ *handle = DMA_MAPPING_ERROR;
allowblock = gfpflags_allow_blocking(gfp);
cma = allowblock ? dev_get_cma_area(dev) : false;

@@ -1217,7 +1210,7 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping,
if (i = mapping->nr_bitmaps) {
if (extend_iommu_mapping(mapping)) {
spin_unlock_irqrestore(&mapping->lock, flags);
- return ARM_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

start = bitmap_find_next_zero_area(mapping->bitmaps[i],
@@ -1225,7 +1218,7 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping,

if (start > mapping->bits) {
spin_unlock_irqrestore(&mapping->lock, flags);
- return ARM_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

bitmap_set(mapping->bitmaps[i], start, count);
@@ -1409,7 +1402,7 @@ __iommu_create_mapping(struct device *dev, struct page **pages, size_t size,
int i;

dma_addr = __alloc_iova(mapping, size);
- if (dma_addr = ARM_MAPPING_ERROR)
+ if (dma_addr = DMA_MAPPING_ERROR)
return dma_addr;

iova = dma_addr;
@@ -1436,7 +1429,7 @@ __iommu_create_mapping(struct device *dev, struct page **pages, size_t size,
fail:
iommu_unmap(mapping->domain, dma_addr, iova-dma_addr);
__free_iova(mapping, dma_addr, size);
- return ARM_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t size)
@@ -1497,7 +1490,7 @@ static void *__iommu_alloc_simple(struct device *dev, size_t size, gfp_t gfp,
return NULL;

*handle = __iommu_create_mapping(dev, &page, size, attrs);
- if (*handle = ARM_MAPPING_ERROR)
+ if (*handle = DMA_MAPPING_ERROR)
goto err_mapping;

return addr;
@@ -1525,7 +1518,7 @@ static void *__arm_iommu_alloc_attrs(struct device *dev, size_t size,
struct page **pages;
void *addr = NULL;

- *handle = ARM_MAPPING_ERROR;
+ *handle = DMA_MAPPING_ERROR;
size = PAGE_ALIGN(size);

if (coherent_flag = COHERENT || !gfpflags_allow_blocking(gfp))
@@ -1546,7 +1539,7 @@ static void *__arm_iommu_alloc_attrs(struct device *dev, size_t size,
return NULL;

*handle = __iommu_create_mapping(dev, pages, size, attrs);
- if (*handle = ARM_MAPPING_ERROR)
+ if (*handle = DMA_MAPPING_ERROR)
goto err_buffer;

if (attrs & DMA_ATTR_NO_KERNEL_MAPPING)
@@ -1696,10 +1689,10 @@ static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
int prot;

size = PAGE_ALIGN(size);
- *handle = ARM_MAPPING_ERROR;
+ *handle = DMA_MAPPING_ERROR;

iova_base = iova = __alloc_iova(mapping, size);
- if (iova = ARM_MAPPING_ERROR)
+ if (iova = DMA_MAPPING_ERROR)
return -ENOMEM;

for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) {
@@ -1739,7 +1732,7 @@ static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
for (i = 1; i < nents; i++) {
s = sg_next(s);

- s->dma_address = ARM_MAPPING_ERROR;
+ s->dma_address = DMA_MAPPING_ERROR;
s->dma_length = 0;

if (s->offset || (size & ~PAGE_MASK) || size + s->length > max) {
@@ -1914,7 +1907,7 @@ static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *p
int ret, prot, len = PAGE_ALIGN(size + offset);

dma_addr = __alloc_iova(mapping, len);
- if (dma_addr = ARM_MAPPING_ERROR)
+ if (dma_addr = DMA_MAPPING_ERROR)
return dma_addr;

prot = __dma_info_to_prot(dir, attrs);
@@ -1926,7 +1919,7 @@ static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *p
return dma_addr + offset;
fail:
__free_iova(mapping, dma_addr, len);
- return ARM_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

/**
@@ -2020,7 +2013,7 @@ static dma_addr_t arm_iommu_map_resource(struct device *dev,
size_t len = PAGE_ALIGN(size + offset);

dma_addr = __alloc_iova(mapping, len);
- if (dma_addr = ARM_MAPPING_ERROR)
+ if (dma_addr = DMA_MAPPING_ERROR)
return dma_addr;

prot = __dma_info_to_prot(dir, attrs) | IOMMU_MMIO;
@@ -2032,7 +2025,7 @@ static dma_addr_t arm_iommu_map_resource(struct device *dev,
return dma_addr + offset;
fail:
__free_iova(mapping, dma_addr, len);
- return ARM_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

/**
@@ -2105,7 +2098,6 @@ const struct dma_map_ops iommu_ops = {
.map_resource = arm_iommu_map_resource,
.unmap_resource = arm_iommu_unmap_resource,

- .mapping_error = arm_dma_mapping_error,
.dma_supported = arm_dma_supported,
};

@@ -2124,7 +2116,6 @@ const struct dma_map_ops iommu_coherent_ops = {
.map_resource = arm_iommu_map_resource,
.unmap_resource = arm_iommu_unmap_resource,

- .mapping_error = arm_dma_mapping_error,
.dma_supported = arm_dma_supported,
};

--
2.19.1