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Code Issues Releases Wiki Activity

arm: remove the mapping_error dma_map_ops method

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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>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2018-11-21 18:57:36 +01:00
parent b0cbeae494
commit 72fd97bf4e
3 changed files with 18 additions and 35 deletions
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12
arch/arm/common/dmabounce.c
View file

@ -257,7 +257,7 @@ static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
if (buf == NULL) { if (buf == NULL) {
dev_err(dev, "%s: unable to map unsafe buffer %p!\n", dev_err(dev, "%s: unable to map unsafe buffer %p!\n",
__func__, ptr); __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", 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); ret = needs_bounce(dev, dma_addr, size);
if (ret < 0) if (ret < 0)
return ARM_MAPPING_ERROR; return DMA_MAPPING_ERROR;
if (ret == 0) { if (ret == 0) {
arm_dma_ops.sync_single_for_device(dev, dma_addr, size, dir); 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)) { if (PageHighMem(page)) {
dev_err(dev, "DMA buffer bouncing of HIGHMEM pages is not supported\n"); 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); 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); 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 = { static const struct dma_map_ops dmabounce_ops = {
.alloc = arm_dma_alloc, .alloc = arm_dma_alloc,
.free = arm_dma_free, .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_cpu = arm_dma_sync_sg_for_cpu,
.sync_sg_for_device = arm_dma_sync_sg_for_device, .sync_sg_for_device = arm_dma_sync_sg_for_device,
.dma_supported = dmabounce_dma_supported, .dma_supported = dmabounce_dma_supported,
.mapping_error = dmabounce_mapping_error,
}; };
static int dmabounce_init_pool(struct dmabounce_pool *pool, struct device *dev, static int dmabounce_init_pool(struct dmabounce_pool *pool, struct device *dev,

2
arch/arm/include/asm/dma-iommu.h
View file

@ -9,8 +9,6 @@
#include <linux/dma-debug.h> #include <linux/dma-debug.h>
#include <linux/kref.h> #include <linux/kref.h>
#define ARM_MAPPING_ERROR (~(dma_addr_t)0x0)
struct dma_iommu_mapping { struct dma_iommu_mapping {
/* iommu specific data */ /* iommu specific data */
struct iommu_domain *domain; struct iommu_domain *domain;

39
arch/arm/mm/dma-mapping.c
View file

@ -179,11 +179,6 @@ static void arm_dma_sync_single_for_device(struct device *dev,
__dma_page_cpu_to_dev(page, offset, size, dir); __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 = { const struct dma_map_ops arm_dma_ops = {
.alloc = arm_dma_alloc, .alloc = arm_dma_alloc,
.free = arm_dma_free, .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_single_for_device = arm_dma_sync_single_for_device,
.sync_sg_for_cpu = arm_dma_sync_sg_for_cpu, .sync_sg_for_cpu = arm_dma_sync_sg_for_cpu,
.sync_sg_for_device = arm_dma_sync_sg_for_device, .sync_sg_for_device = arm_dma_sync_sg_for_device,
.mapping_error = arm_dma_mapping_error,
.dma_supported = arm_dma_supported, .dma_supported = arm_dma_supported,
}; };
EXPORT_SYMBOL(arm_dma_ops); EXPORT_SYMBOL(arm_dma_ops);
@ -217,7 +211,6 @@ const struct dma_map_ops arm_coherent_dma_ops = {
.get_sgtable = arm_dma_get_sgtable, .get_sgtable = arm_dma_get_sgtable,
.map_page = arm_coherent_dma_map_page, .map_page = arm_coherent_dma_map_page,
.map_sg = arm_dma_map_sg, .map_sg = arm_dma_map_sg,
.mapping_error = arm_dma_mapping_error,
.dma_supported = arm_dma_supported, .dma_supported = arm_dma_supported,
}; };
EXPORT_SYMBOL(arm_coherent_dma_ops); 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); gfp &= ~(__GFP_COMP);
args.gfp = gfp; args.gfp = gfp;
*handle = ARM_MAPPING_ERROR; *handle = DMA_MAPPING_ERROR;
allowblock = gfpflags_allow_blocking(gfp); allowblock = gfpflags_allow_blocking(gfp);
cma = allowblock ? dev_get_cma_area(dev) : false; 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 (i == mapping->nr_bitmaps) {
if (extend_iommu_mapping(mapping)) { if (extend_iommu_mapping(mapping)) {
spin_unlock_irqrestore(&mapping->lock, flags); spin_unlock_irqrestore(&mapping->lock, flags);
return ARM_MAPPING_ERROR; return DMA_MAPPING_ERROR;
} }
start = bitmap_find_next_zero_area(mapping->bitmaps[i], 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) { if (start > mapping->bits) {
spin_unlock_irqrestore(&mapping->lock, flags); spin_unlock_irqrestore(&mapping->lock, flags);
return ARM_MAPPING_ERROR; return DMA_MAPPING_ERROR;
} }
bitmap_set(mapping->bitmaps[i], start, count); 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; int i;
dma_addr = __alloc_iova(mapping, size); dma_addr = __alloc_iova(mapping, size);
if (dma_addr == ARM_MAPPING_ERROR) if (dma_addr == DMA_MAPPING_ERROR)
return dma_addr; return dma_addr;
iova = dma_addr; iova = dma_addr;
@ -1436,7 +1429,7 @@ __iommu_create_mapping(struct device *dev, struct page **pages, size_t size,
fail: fail:
iommu_unmap(mapping->domain, dma_addr, iova-dma_addr); iommu_unmap(mapping->domain, dma_addr, iova-dma_addr);
__free_iova(mapping, dma_addr, size); __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) 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; return NULL;
*handle = __iommu_create_mapping(dev, &page, size, attrs); *handle = __iommu_create_mapping(dev, &page, size, attrs);
if (*handle == ARM_MAPPING_ERROR) if (*handle == DMA_MAPPING_ERROR)
goto err_mapping; goto err_mapping;
return addr; return addr;
@ -1525,7 +1518,7 @@ static void *__arm_iommu_alloc_attrs(struct device *dev, size_t size,
struct page **pages; struct page **pages;
void *addr = NULL; void *addr = NULL;
*handle = ARM_MAPPING_ERROR; *handle = DMA_MAPPING_ERROR;
size = PAGE_ALIGN(size); size = PAGE_ALIGN(size);
if (coherent_flag == COHERENT || !gfpflags_allow_blocking(gfp)) 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; return NULL;
*handle = __iommu_create_mapping(dev, pages, size, attrs); *handle = __iommu_create_mapping(dev, pages, size, attrs);
if (*handle == ARM_MAPPING_ERROR) if (*handle == DMA_MAPPING_ERROR)
goto err_buffer; goto err_buffer;
if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) if (attrs & DMA_ATTR_NO_KERNEL_MAPPING)
@ -1696,10 +1689,10 @@ static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
int prot; int prot;
size = PAGE_ALIGN(size); size = PAGE_ALIGN(size);
*handle = ARM_MAPPING_ERROR; *handle = DMA_MAPPING_ERROR;
iova_base = iova = __alloc_iova(mapping, size); iova_base = iova = __alloc_iova(mapping, size);
if (iova == ARM_MAPPING_ERROR) if (iova == DMA_MAPPING_ERROR)
return -ENOMEM; return -ENOMEM;
for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) { 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++) { for (i = 1; i < nents; i++) {
s = sg_next(s); s = sg_next(s);
s->dma_address = ARM_MAPPING_ERROR; s->dma_address = DMA_MAPPING_ERROR;
s->dma_length = 0; s->dma_length = 0;
if (s->offset || (size & ~PAGE_MASK) || size + s->length > max) { 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); int ret, prot, len = PAGE_ALIGN(size + offset);
dma_addr = __alloc_iova(mapping, len); dma_addr = __alloc_iova(mapping, len);
if (dma_addr == ARM_MAPPING_ERROR) if (dma_addr == DMA_MAPPING_ERROR)
return dma_addr; return dma_addr;
prot = __dma_info_to_prot(dir, attrs); 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; return dma_addr + offset;
fail: fail:
__free_iova(mapping, dma_addr, len); __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); size_t len = PAGE_ALIGN(size + offset);
dma_addr = __alloc_iova(mapping, len); dma_addr = __alloc_iova(mapping, len);
if (dma_addr == ARM_MAPPING_ERROR) if (dma_addr == DMA_MAPPING_ERROR)
return dma_addr; return dma_addr;
prot = __dma_info_to_prot(dir, attrs) | IOMMU_MMIO; 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; return dma_addr + offset;
fail: fail:
__free_iova(mapping, dma_addr, len); __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, .map_resource = arm_iommu_map_resource,
.unmap_resource = arm_iommu_unmap_resource, .unmap_resource = arm_iommu_unmap_resource,
.mapping_error = arm_dma_mapping_error,
.dma_supported = arm_dma_supported, .dma_supported = arm_dma_supported,
}; };
@ -2124,7 +2116,6 @@ const struct dma_map_ops iommu_coherent_ops = {
.map_resource = arm_iommu_map_resource, .map_resource = arm_iommu_map_resource,
.unmap_resource = arm_iommu_unmap_resource, .unmap_resource = arm_iommu_unmap_resource,
.mapping_error = arm_dma_mapping_error,
.dma_supported = arm_dma_supported, .dma_supported = arm_dma_supported,
}; };