[PATCH 1/2] dma-mapping: remove ->mapping_error

From: Christoph Hellwig
Date: Fri Nov 09 2018 - 03:46:44 EST

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There is no need to perform an indirect function call to check if a
DMA mapping resulted in an error, if we always return the last
possible dma address as the error code. While that could in theory
be a valid DMAable region, it would have to assume we want to
support unaligned DMAs of size 1, which is rather pointless.

Instead simplify the whole machinery by using (~(dma_addr_t)0x0)
as the common error return.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
arch/alpha/kernel/pci_iommu.c | 10 ++-----
arch/arm/common/dmabounce.c | 12 +++------
arch/arm/include/asm/dma-iommu.h | 2 --
arch/arm/mm/dma-mapping.c | 39 +++++++++++-----------------
arch/arm64/mm/dma-mapping.c | 15 +++--------
arch/ia64/hp/common/sba_iommu.c | 8 +-----
arch/ia64/sn/pci/pci_dma.c | 8 +-----
arch/mips/include/asm/jazzdma.h | 6 -----
arch/mips/jazz/jazzdma.c | 16 ++++--------
arch/powerpc/include/asm/iommu.h | 3 ---
arch/powerpc/kernel/dma-iommu.c | 6 -----
arch/powerpc/kernel/dma-swiotlb.c | 1 -
arch/powerpc/kernel/iommu.c | 28 ++++++++++----------
arch/powerpc/platforms/cell/iommu.c | 1 -
arch/powerpc/platforms/pseries/vio.c | 3 +--
arch/s390/pci/pci_dma.c | 18 ++++---------
arch/sparc/kernel/iommu.c | 12 +++------
arch/sparc/kernel/iommu_common.h | 2 --
arch/sparc/kernel/pci_sun4v.c | 14 +++-------
arch/x86/kernel/amd_gart_64.c | 19 ++++----------
arch/x86/kernel/pci-calgary_64.c | 24 ++++++-----------
drivers/iommu/amd_iommu.c | 18 ++++---------
drivers/iommu/dma-iommu.c | 23 ++++++----------
drivers/iommu/intel-iommu.c | 13 +++++-----
drivers/parisc/ccio-dma.c | 10 +------
drivers/parisc/sba_iommu.c | 10 +------
drivers/pci/controller/vmd.c | 6 -----
drivers/xen/swiotlb-xen.c | 12 ++-------
include/linux/dma-direct.h | 3 ---
include/linux/dma-iommu.h | 1 -
include/linux/dma-mapping.h | 12 ++++-----
kernel/dma/direct.c | 8 +-----
kernel/dma/swiotlb.c | 9 +++----
33 files changed, 105 insertions(+), 267 deletions(-)

diff --git a/arch/alpha/kernel/pci_iommu.c b/arch/alpha/kernel/pci_iommu.c
index 46e08e0d9181..30339a0369ce 100644
--- a/arch/alpha/kernel/pci_iommu.c
+++ b/arch/alpha/kernel/pci_iommu.c
@@ -291,7 +291,7 @@ pci_map_single_1(struct pci_dev *pdev, void *cpu_addr, size_t size,
use direct_map above, it now must be considered an error. */
if (! alpha_mv.mv_pci_tbi) {
printk_once(KERN_WARNING "pci_map_single: no HW sg\n");
- return 0;
+ return DMA_MAPPING_ERROR;
}

arena = hose->sg_pci;
@@ -307,7 +307,7 @@ pci_map_single_1(struct pci_dev *pdev, void *cpu_addr, size_t size,
if (dma_ofs < 0) {
printk(KERN_WARNING "pci_map_single failed: "
"could not allocate dma page tables\n");
- return 0;
+ return DMA_MAPPING_ERROR;
}

paddr &= PAGE_MASK;
@@ -935,11 +935,6 @@ iommu_unbind(struct pci_iommu_arena *arena, long pg_start, long pg_count)
return 0;
}

-static int alpha_pci_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == 0;
-}
-
const struct dma_map_ops alpha_pci_ops = {
.alloc = alpha_pci_alloc_coherent,
.free = alpha_pci_free_coherent,
@@ -947,7 +942,6 @@ const struct dma_map_ops alpha_pci_ops = {
.unmap_page = alpha_pci_unmap_page,
.map_sg = alpha_pci_map_sg,
.unmap_sg = alpha_pci_unmap_sg,
- .mapping_error = alpha_pci_mapping_error,
.dma_supported = alpha_pci_supported,
};
EXPORT_SYMBOL(alpha_pci_ops);
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,
};

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index a3ac26284845..4cc70029cf8d 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -282,7 +282,7 @@ static dma_addr_t __dummy_map_page(struct device *dev, struct page *page,
enum dma_data_direction dir,
unsigned long attrs)
{
- return 0;
+ return DMA_MAPPING_ERROR;
}

static void __dummy_unmap_page(struct device *dev, dma_addr_t dev_addr,
@@ -317,11 +317,6 @@ static void __dummy_sync_sg(struct device *dev,
{
}

-static int __dummy_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
-{
- return 1;
-}
-
static int __dummy_dma_supported(struct device *hwdev, u64 mask)
{
return 0;
@@ -339,7 +334,6 @@ const struct dma_map_ops dummy_dma_ops = {
.sync_single_for_device = __dummy_sync_single,
.sync_sg_for_cpu = __dummy_sync_sg,
.sync_sg_for_device = __dummy_sync_sg,
- .mapping_error = __dummy_mapping_error,
.dma_supported = __dummy_dma_supported,
};
EXPORT_SYMBOL(dummy_dma_ops);
@@ -403,7 +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
@@ -420,7 +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;
@@ -580,7 +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;
@@ -663,7 +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/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index e8a93b07283e..5fca8ca85629 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -973,7 +973,7 @@ static dma_addr_t sba_map_page(struct device *dev, struct page *page,

pide = sba_alloc_range(ioc, dev, size);
if (pide < 0)
- return 0;
+ return DMA_MAPPING_ERROR;

iovp = (dma_addr_t) pide << iovp_shift;

@@ -2170,11 +2170,6 @@ static int sba_dma_supported (struct device *dev, u64 mask)
return ((mask & 0xFFFFFFFFUL) == 0xFFFFFFFFUL);
}

-static int sba_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return 0;
-}
-
__setup("nosbagart", nosbagart);

static int __init
@@ -2208,7 +2203,6 @@ const struct dma_map_ops sba_dma_ops = {
.map_sg = sba_map_sg_attrs,
.unmap_sg = sba_unmap_sg_attrs,
.dma_supported = sba_dma_supported,
- .mapping_error = sba_dma_mapping_error,
};

void sba_dma_init(void)
diff --git a/arch/ia64/sn/pci/pci_dma.c b/arch/ia64/sn/pci/pci_dma.c
index 4ce4ee4ef9f2..b7d42e4edc1f 100644
--- a/arch/ia64/sn/pci/pci_dma.c
+++ b/arch/ia64/sn/pci/pci_dma.c
@@ -196,7 +196,7 @@ static dma_addr_t sn_dma_map_page(struct device *dev, struct page *page,

if (!dma_addr) {
printk(KERN_ERR "%s: out of ATEs\n", __func__);
- return 0;
+ return DMA_MAPPING_ERROR;
}
return dma_addr;
}
@@ -314,11 +314,6 @@ static int sn_dma_map_sg(struct device *dev, struct scatterlist *sgl,
return nhwentries;
}

-static int sn_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return 0;
-}
-
static u64 sn_dma_get_required_mask(struct device *dev)
{
return DMA_BIT_MASK(64);
@@ -441,7 +436,6 @@ static struct dma_map_ops sn_dma_ops = {
.unmap_page = sn_dma_unmap_page,
.map_sg = sn_dma_map_sg,
.unmap_sg = sn_dma_unmap_sg,
- .mapping_error = sn_dma_mapping_error,
.dma_supported = sn_dma_supported,
.get_required_mask = sn_dma_get_required_mask,
};
diff --git a/arch/mips/include/asm/jazzdma.h b/arch/mips/include/asm/jazzdma.h
index d913439c738c..d13f940022d5 100644
--- a/arch/mips/include/asm/jazzdma.h
+++ b/arch/mips/include/asm/jazzdma.h
@@ -39,12 +39,6 @@ extern int vdma_get_enable(int channel);
#define VDMA_PAGE(a) ((unsigned int)(a) >> 12)
#define VDMA_OFFSET(a) ((unsigned int)(a) & (VDMA_PAGESIZE-1))

-/*
- * error code returned by vdma_alloc()
- * (See also arch/mips/kernel/jazzdma.c)
- */
-#define VDMA_ERROR 0xffffffff
-
/*
* VDMA pagetable entry description
*/
diff --git a/arch/mips/jazz/jazzdma.c b/arch/mips/jazz/jazzdma.c
index 4c41ed0a637e..6256d35dbf4d 100644
--- a/arch/mips/jazz/jazzdma.c
+++ b/arch/mips/jazz/jazzdma.c
@@ -104,12 +104,12 @@ unsigned long vdma_alloc(unsigned long paddr, unsigned long size)
if (vdma_debug)
printk("vdma_alloc: Invalid physical address: %08lx\n",
paddr);
- return VDMA_ERROR; /* invalid physical address */
+ return DMA_MAPPING_ERROR; /* invalid physical address */
}
if (size > 0x400000 || size == 0) {
if (vdma_debug)
printk("vdma_alloc: Invalid size: %08lx\n", size);
- return VDMA_ERROR; /* invalid physical address */
+ return DMA_MAPPING_ERROR; /* invalid physical address */
}

spin_lock_irqsave(&vdma_lock, flags);
@@ -123,7 +123,7 @@ unsigned long vdma_alloc(unsigned long paddr, unsigned long size)
first < VDMA_PGTBL_ENTRIES) first++;
if (first + pages > VDMA_PGTBL_ENTRIES) { /* nothing free */
spin_unlock_irqrestore(&vdma_lock, flags);
- return VDMA_ERROR;
+ return DMA_MAPPING_ERROR;
}

last = first + 1;
@@ -569,7 +569,7 @@ static void *jazz_dma_alloc(struct device *dev, size_t size,
return NULL;

*dma_handle = vdma_alloc(virt_to_phys(ret), size);
- if (*dma_handle == VDMA_ERROR) {
+ if (*dma_handle == DMA_MAPPING_ERROR) {
dma_direct_free_pages(dev, size, ret, *dma_handle, attrs);
return NULL;
}
@@ -620,7 +620,7 @@ static int jazz_dma_map_sg(struct device *dev, struct scatterlist *sglist,
arch_sync_dma_for_device(dev, sg_phys(sg), sg->length,
dir);
sg->dma_address = vdma_alloc(sg_phys(sg), sg->length);
- if (sg->dma_address == VDMA_ERROR)
+ if (sg->dma_address == DMA_MAPPING_ERROR)
return 0;
sg_dma_len(sg) = sg->length;
}
@@ -674,11 +674,6 @@ static void jazz_dma_sync_sg_for_cpu(struct device *dev,
arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir);
}

-static int jazz_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == VDMA_ERROR;
-}
-
const struct dma_map_ops jazz_dma_ops = {
.alloc = jazz_dma_alloc,
.free = jazz_dma_free,
@@ -692,6 +687,5 @@ const struct dma_map_ops jazz_dma_ops = {
.sync_sg_for_device = jazz_dma_sync_sg_for_device,
.dma_supported = dma_direct_supported,
.cache_sync = arch_dma_cache_sync,
- .mapping_error = jazz_dma_mapping_error,
};
EXPORT_SYMBOL(jazz_dma_ops);
diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h
index 35db0cbc9222..5c45e702133c 100644
--- a/arch/powerpc/include/asm/iommu.h
+++ b/arch/powerpc/include/asm/iommu.h
@@ -142,9 +142,6 @@ int get_iommu_order(unsigned long size, struct iommu_table *tbl)
struct scatterlist;

#ifdef CONFIG_PPC64
-
-#define IOMMU_MAPPING_ERROR (~(dma_addr_t)0x0)
-
static inline void set_iommu_table_base(struct device *dev,
struct iommu_table *base)
{
diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c
index f9fe2080ceb9..5ebacf0fe41a 100644
--- a/arch/powerpc/kernel/dma-iommu.c
+++ b/arch/powerpc/kernel/dma-iommu.c
@@ -106,11 +106,6 @@ static u64 dma_iommu_get_required_mask(struct device *dev)
return mask;
}

-int dma_iommu_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == IOMMU_MAPPING_ERROR;
-}
-
struct dma_map_ops dma_iommu_ops = {
.alloc = dma_iommu_alloc_coherent,
.free = dma_iommu_free_coherent,
@@ -121,6 +116,5 @@ struct dma_map_ops dma_iommu_ops = {
.map_page = dma_iommu_map_page,
.unmap_page = dma_iommu_unmap_page,
.get_required_mask = dma_iommu_get_required_mask,
- .mapping_error = dma_iommu_mapping_error,
};
EXPORT_SYMBOL(dma_iommu_ops);
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index 5fc335f4d9cd..3d8df2cf8be9 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -59,7 +59,6 @@ const struct dma_map_ops powerpc_swiotlb_dma_ops = {
.sync_single_for_device = swiotlb_sync_single_for_device,
.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
.sync_sg_for_device = swiotlb_sync_sg_for_device,
- .mapping_error = dma_direct_mapping_error,
.get_required_mask = swiotlb_powerpc_get_required,
};

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index f0dc680e659a..ca7f73488c62 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -197,11 +197,11 @@ static unsigned long iommu_range_alloc(struct device *dev,
if (unlikely(npages == 0)) {
if (printk_ratelimit())
WARN_ON(1);
- return IOMMU_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

if (should_fail_iommu(dev))
- return IOMMU_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;

/*
* We don't need to disable preemption here because any CPU can
@@ -277,7 +277,7 @@ static unsigned long iommu_range_alloc(struct device *dev,
} else {
/* Give up */
spin_unlock_irqrestore(&(pool->lock), flags);
- return IOMMU_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}
}

@@ -309,13 +309,13 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
unsigned long attrs)
{
unsigned long entry;
- dma_addr_t ret = IOMMU_MAPPING_ERROR;
+ dma_addr_t ret = DMA_MAPPING_ERROR;
int build_fail;

entry = iommu_range_alloc(dev, tbl, npages, NULL, mask, align_order);

- if (unlikely(entry == IOMMU_MAPPING_ERROR))
- return IOMMU_MAPPING_ERROR;
+ if (unlikely(entry == DMA_MAPPING_ERROR))
+ return DMA_MAPPING_ERROR;

entry += tbl->it_offset; /* Offset into real TCE table */
ret = entry << tbl->it_page_shift; /* Set the return dma address */
@@ -327,12 +327,12 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,

/* tbl->it_ops->set() only returns non-zero for transient errors.
* Clean up the table bitmap in this case and return
- * IOMMU_MAPPING_ERROR. For all other errors the functionality is
+ * DMA_MAPPING_ERROR. For all other errors the functionality is
* not altered.
*/
if (unlikely(build_fail)) {
__iommu_free(tbl, ret, npages);
- return IOMMU_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

/* Flush/invalidate TLB caches if necessary */
@@ -477,7 +477,7 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
DBG(" - vaddr: %lx, size: %lx\n", vaddr, slen);

/* Handle failure */
- if (unlikely(entry == IOMMU_MAPPING_ERROR)) {
+ if (unlikely(entry == DMA_MAPPING_ERROR)) {
if (!(attrs & DMA_ATTR_NO_WARN) &&
printk_ratelimit())
dev_info(dev, "iommu_alloc failed, tbl %p "
@@ -544,7 +544,7 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
*/
if (outcount < incount) {
outs = sg_next(outs);
- outs->dma_address = IOMMU_MAPPING_ERROR;
+ outs->dma_address = DMA_MAPPING_ERROR;
outs->dma_length = 0;
}

@@ -562,7 +562,7 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
npages = iommu_num_pages(s->dma_address, s->dma_length,
IOMMU_PAGE_SIZE(tbl));
__iommu_free(tbl, vaddr, npages);
- s->dma_address = IOMMU_MAPPING_ERROR;
+ s->dma_address = DMA_MAPPING_ERROR;
s->dma_length = 0;
}
if (s == outs)
@@ -776,7 +776,7 @@ dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
unsigned long mask, enum dma_data_direction direction,
unsigned long attrs)
{
- dma_addr_t dma_handle = IOMMU_MAPPING_ERROR;
+ dma_addr_t dma_handle = DMA_MAPPING_ERROR;
void *vaddr;
unsigned long uaddr;
unsigned int npages, align;
@@ -796,7 +796,7 @@ dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
dma_handle = iommu_alloc(dev, tbl, vaddr, npages, direction,
mask >> tbl->it_page_shift, align,
attrs);
- if (dma_handle == IOMMU_MAPPING_ERROR) {
+ if (dma_handle == DMA_MAPPING_ERROR) {
if (!(attrs & DMA_ATTR_NO_WARN) &&
printk_ratelimit()) {
dev_info(dev, "iommu_alloc failed, tbl %p "
@@ -868,7 +868,7 @@ void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl,
io_order = get_iommu_order(size, tbl);
mapping = iommu_alloc(dev, tbl, ret, nio_pages, DMA_BIDIRECTIONAL,
mask >> tbl->it_page_shift, io_order, 0);
- if (mapping == IOMMU_MAPPING_ERROR) {
+ if (mapping == DMA_MAPPING_ERROR) {
free_pages((unsigned long)ret, order);
return NULL;
}
diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index 12352a58072a..af2a3c15e0ec 100644
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -654,7 +654,6 @@ static const struct dma_map_ops dma_iommu_fixed_ops = {
.dma_supported = dma_suported_and_switch,
.map_page = dma_fixed_map_page,
.unmap_page = dma_fixed_unmap_page,
- .mapping_error = dma_iommu_mapping_error,
};

static void cell_dma_dev_setup(struct device *dev)
diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c
index 88f1ad1d6309..a29ad7db918a 100644
--- a/arch/powerpc/platforms/pseries/vio.c
+++ b/arch/powerpc/platforms/pseries/vio.c
@@ -519,7 +519,7 @@ static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page,
{
struct vio_dev *viodev = to_vio_dev(dev);
struct iommu_table *tbl;
- dma_addr_t ret = IOMMU_MAPPING_ERROR;
+ dma_addr_t ret = DMA_MAPPING_ERROR;

tbl = get_iommu_table_base(dev);
if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)))) {
@@ -625,7 +625,6 @@ static const struct dma_map_ops vio_dma_mapping_ops = {
.unmap_page = vio_dma_iommu_unmap_page,
.dma_supported = vio_dma_iommu_dma_supported,
.get_required_mask = vio_dma_get_required_mask,
- .mapping_error = dma_iommu_mapping_error,
};

/**
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index d387a0fbdd7e..346ba382193a 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -15,8 +15,6 @@
#include <linux/pci.h>
#include <asm/pci_dma.h>

-#define S390_MAPPING_ERROR (~(dma_addr_t) 0x0)
-
static struct kmem_cache *dma_region_table_cache;
static struct kmem_cache *dma_page_table_cache;
static int s390_iommu_strict;
@@ -301,7 +299,7 @@ static dma_addr_t dma_alloc_address(struct device *dev, int size)

out_error:
spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
- return S390_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

static void dma_free_address(struct device *dev, dma_addr_t dma_addr, int size)
@@ -349,7 +347,7 @@ static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
/* This rounds up number of pages based on size and offset */
nr_pages = iommu_num_pages(pa, size, PAGE_SIZE);
dma_addr = dma_alloc_address(dev, nr_pages);
- if (dma_addr == S390_MAPPING_ERROR) {
+ if (dma_addr == DMA_MAPPING_ERROR) {
ret = -ENOSPC;
goto out_err;
}
@@ -372,7 +370,7 @@ static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
out_err:
zpci_err("map error:\n");
zpci_err_dma(ret, pa);
- return S390_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr,
@@ -449,7 +447,7 @@ static int __s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
int ret;

dma_addr_base = dma_alloc_address(dev, nr_pages);
- if (dma_addr_base == S390_MAPPING_ERROR)
+ if (dma_addr_base == DMA_MAPPING_ERROR)
return -ENOMEM;

dma_addr = dma_addr_base;
@@ -496,7 +494,7 @@ static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
for (i = 1; i < nr_elements; i++) {
s = sg_next(s);

- s->dma_address = S390_MAPPING_ERROR;
+ s->dma_address = DMA_MAPPING_ERROR;
s->dma_length = 0;

if (s->offset || (size & ~PAGE_MASK) ||
@@ -546,11 +544,6 @@ static void s390_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
}
}

-static int s390_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == S390_MAPPING_ERROR;
-}
-
int zpci_dma_init_device(struct zpci_dev *zdev)
{
int rc;
@@ -675,7 +668,6 @@ const struct dma_map_ops s390_pci_dma_ops = {
.unmap_sg = s390_dma_unmap_sg,
.map_page = s390_dma_map_pages,
.unmap_page = s390_dma_unmap_pages,
- .mapping_error = s390_mapping_error,
/* dma_supported is unconditionally true without a callback */
};
EXPORT_SYMBOL_GPL(s390_pci_dma_ops);
diff --git a/arch/sparc/kernel/iommu.c b/arch/sparc/kernel/iommu.c
index 40d008b0bd3e..0626bae5e3da 100644
--- a/arch/sparc/kernel/iommu.c
+++ b/arch/sparc/kernel/iommu.c
@@ -315,7 +315,7 @@ static dma_addr_t dma_4u_map_page(struct device *dev, struct page *page,
bad_no_ctx:
if (printk_ratelimit())
WARN_ON(1);
- return SPARC_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

static void strbuf_flush(struct strbuf *strbuf, struct iommu *iommu,
@@ -548,7 +548,7 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,

if (outcount < incount) {
outs = sg_next(outs);
- outs->dma_address = SPARC_MAPPING_ERROR;
+ outs->dma_address = DMA_MAPPING_ERROR;
outs->dma_length = 0;
}

@@ -574,7 +574,7 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
iommu_tbl_range_free(&iommu->tbl, vaddr, npages,
IOMMU_ERROR_CODE);

- s->dma_address = SPARC_MAPPING_ERROR;
+ s->dma_address = DMA_MAPPING_ERROR;
s->dma_length = 0;
}
if (s == outs)
@@ -742,11 +742,6 @@ static void dma_4u_sync_sg_for_cpu(struct device *dev,
spin_unlock_irqrestore(&iommu->lock, flags);
}

-static int dma_4u_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == SPARC_MAPPING_ERROR;
-}
-
static int dma_4u_supported(struct device *dev, u64 device_mask)
{
struct iommu *iommu = dev->archdata.iommu;
@@ -772,7 +767,6 @@ static const struct dma_map_ops sun4u_dma_ops = {
.sync_single_for_cpu = dma_4u_sync_single_for_cpu,
.sync_sg_for_cpu = dma_4u_sync_sg_for_cpu,
.dma_supported = dma_4u_supported,
- .mapping_error = dma_4u_mapping_error,
};

const struct dma_map_ops *dma_ops = &sun4u_dma_ops;
diff --git a/arch/sparc/kernel/iommu_common.h b/arch/sparc/kernel/iommu_common.h
index e3c02ba32500..d62ed9c5682d 100644
--- a/arch/sparc/kernel/iommu_common.h
+++ b/arch/sparc/kernel/iommu_common.h
@@ -48,6 +48,4 @@ static inline int is_span_boundary(unsigned long entry,
return iommu_is_span_boundary(entry, nr, shift, boundary_size);
}

-#define SPARC_MAPPING_ERROR (~(dma_addr_t)0x0)
-
#endif /* _IOMMU_COMMON_H */
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c
index 565d9ac883d0..fa0e42b4cbfb 100644
--- a/arch/sparc/kernel/pci_sun4v.c
+++ b/arch/sparc/kernel/pci_sun4v.c
@@ -414,12 +414,12 @@ static dma_addr_t dma_4v_map_page(struct device *dev, struct page *page,
bad:
if (printk_ratelimit())
WARN_ON(1);
- return SPARC_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;

iommu_map_fail:
local_irq_restore(flags);
iommu_tbl_range_free(tbl, bus_addr, npages, IOMMU_ERROR_CODE);
- return SPARC_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

static void dma_4v_unmap_page(struct device *dev, dma_addr_t bus_addr,
@@ -592,7 +592,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,

if (outcount < incount) {
outs = sg_next(outs);
- outs->dma_address = SPARC_MAPPING_ERROR;
+ outs->dma_address = DMA_MAPPING_ERROR;
outs->dma_length = 0;
}

@@ -609,7 +609,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
iommu_tbl_range_free(tbl, vaddr, npages,
IOMMU_ERROR_CODE);
/* XXX demap? XXX */
- s->dma_address = SPARC_MAPPING_ERROR;
+ s->dma_address = DMA_MAPPING_ERROR;
s->dma_length = 0;
}
if (s == outs)
@@ -688,11 +688,6 @@ static int dma_4v_supported(struct device *dev, u64 device_mask)
return pci64_dma_supported(to_pci_dev(dev), device_mask);
}

-static int dma_4v_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == SPARC_MAPPING_ERROR;
-}
-
static const struct dma_map_ops sun4v_dma_ops = {
.alloc = dma_4v_alloc_coherent,
.free = dma_4v_free_coherent,
@@ -701,7 +696,6 @@ static const struct dma_map_ops sun4v_dma_ops = {
.map_sg = dma_4v_map_sg,
.unmap_sg = dma_4v_unmap_sg,
.dma_supported = dma_4v_supported,
- .mapping_error = dma_4v_mapping_error,
};

static void pci_sun4v_scan_bus(struct pci_pbm_info *pbm, struct device *parent)
diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index 3f9d1b4019bb..07484eb36efe 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c
@@ -50,8 +50,6 @@ static unsigned long iommu_pages; /* .. and in pages */

static u32 *iommu_gatt_base; /* Remapping table */

-static dma_addr_t bad_dma_addr;
-
/*
* If this is disabled the IOMMU will use an optimized flushing strategy
* of only flushing when an mapping is reused. With it true the GART is
@@ -220,7 +218,7 @@ static dma_addr_t dma_map_area(struct device *dev, dma_addr_t phys_mem,
int i;

if (unlikely(phys_mem + size > GART_MAX_PHYS_ADDR))
- return bad_dma_addr;
+ return DMA_MAPPING_ERROR;

iommu_page = alloc_iommu(dev, npages, align_mask);
if (iommu_page == -1) {
@@ -229,7 +227,7 @@ static dma_addr_t dma_map_area(struct device *dev, dma_addr_t phys_mem,
if (panic_on_overflow)
panic("dma_map_area overflow %lu bytes\n", size);
iommu_full(dev, size, dir);
- return bad_dma_addr;
+ return DMA_MAPPING_ERROR;
}

for (i = 0; i < npages; i++) {
@@ -315,7 +313,7 @@ static int dma_map_sg_nonforce(struct device *dev, struct scatterlist *sg,

if (nonforced_iommu(dev, addr, s->length)) {
addr = dma_map_area(dev, addr, s->length, dir, 0);
- if (addr == bad_dma_addr) {
+ if (addr == DMA_MAPPING_ERROR) {
if (i > 0)
gart_unmap_sg(dev, sg, i, dir, 0);
nents = 0;
@@ -471,7 +469,7 @@ static int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents,

iommu_full(dev, pages << PAGE_SHIFT, dir);
for_each_sg(sg, s, nents, i)
- s->dma_address = bad_dma_addr;
+ s->dma_address = DMA_MAPPING_ERROR;
return 0;
}

@@ -490,7 +488,7 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
*dma_addr = dma_map_area(dev, virt_to_phys(vaddr), size,
DMA_BIDIRECTIONAL, (1UL << get_order(size)) - 1);
flush_gart();
- if (unlikely(*dma_addr == bad_dma_addr))
+ if (unlikely(*dma_addr == DMA_MAPPING_ERROR))
goto out_free;
return vaddr;
out_free:
@@ -507,11 +505,6 @@ gart_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_direct_free_pages(dev, size, vaddr, dma_addr, attrs);
}

-static int gart_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return (dma_addr == bad_dma_addr);
-}
-
static int no_agp;

static __init unsigned long check_iommu_size(unsigned long aper, u64 aper_size)
@@ -695,7 +688,6 @@ static const struct dma_map_ops gart_dma_ops = {
.unmap_page = gart_unmap_page,
.alloc = gart_alloc_coherent,
.free = gart_free_coherent,
- .mapping_error = gart_mapping_error,
.dma_supported = dma_direct_supported,
};

@@ -796,7 +788,6 @@ int __init gart_iommu_init(void)
agp_memory_reserved = iommu_size;
iommu_start = aper_size - iommu_size;
iommu_bus_base = info.aper_base + iommu_start;
- bad_dma_addr = iommu_bus_base;
iommu_gatt_base = agp_gatt_table + (iommu_start>>PAGE_SHIFT);

/*
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index bbfc8b1e9104..a1af5a707bb7 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -51,8 +51,6 @@
#include <asm/x86_init.h>
#include <asm/iommu_table.h>

-#define CALGARY_MAPPING_ERROR 0
-
#ifdef CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT
int use_calgary __read_mostly = 1;
#else
@@ -255,7 +253,7 @@ static unsigned long iommu_range_alloc(struct device *dev,
if (panic_on_overflow)
panic("Calgary: fix the allocator.\n");
else
- return CALGARY_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}
}

@@ -275,10 +273,10 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,

entry = iommu_range_alloc(dev, tbl, npages);

- if (unlikely(entry == CALGARY_MAPPING_ERROR)) {
+ if (unlikely(entry == DMA_MAPPING_ERROR)) {
pr_warn("failed to allocate %u pages in iommu %p\n",
npages, tbl);
- return CALGARY_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

/* set the return dma address */
@@ -298,7 +296,7 @@ static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
unsigned long flags;

/* were we called with bad_dma_address? */
- badend = CALGARY_MAPPING_ERROR + (EMERGENCY_PAGES * PAGE_SIZE);
+ badend = DMA_MAPPING_ERROR + (EMERGENCY_PAGES * PAGE_SIZE);
if (unlikely(dma_addr < badend)) {
WARN(1, KERN_ERR "Calgary: driver tried unmapping bad DMA "
"address 0x%Lx\n", dma_addr);
@@ -383,7 +381,7 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
npages = iommu_num_pages(vaddr, s->length, PAGE_SIZE);

entry = iommu_range_alloc(dev, tbl, npages);
- if (entry == CALGARY_MAPPING_ERROR) {
+ if (entry == DMA_MAPPING_ERROR) {
/* makes sure unmap knows to stop */
s->dma_length = 0;
goto error;
@@ -401,7 +399,7 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
error:
calgary_unmap_sg(dev, sg, nelems, dir, 0);
for_each_sg(sg, s, nelems, i) {
- sg->dma_address = CALGARY_MAPPING_ERROR;
+ sg->dma_address = DMA_MAPPING_ERROR;
sg->dma_length = 0;
}
return 0;
@@ -454,7 +452,7 @@ static void* calgary_alloc_coherent(struct device *dev, size_t size,

/* set up tces to cover the allocated range */
mapping = iommu_alloc(dev, tbl, ret, npages, DMA_BIDIRECTIONAL);
- if (mapping == CALGARY_MAPPING_ERROR)
+ if (mapping == DMA_MAPPING_ERROR)
goto free;
*dma_handle = mapping;
return ret;
@@ -479,11 +477,6 @@ static void calgary_free_coherent(struct device *dev, size_t size,
free_pages((unsigned long)vaddr, get_order(size));
}

-static int calgary_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == CALGARY_MAPPING_ERROR;
-}
-
static const struct dma_map_ops calgary_dma_ops = {
.alloc = calgary_alloc_coherent,
.free = calgary_free_coherent,
@@ -491,7 +484,6 @@ static const struct dma_map_ops calgary_dma_ops = {
.unmap_sg = calgary_unmap_sg,
.map_page = calgary_map_page,
.unmap_page = calgary_unmap_page,
- .mapping_error = calgary_mapping_error,
.dma_supported = dma_direct_supported,
};

@@ -740,7 +732,7 @@ static void __init calgary_reserve_regions(struct pci_dev *dev)
struct iommu_table *tbl = pci_iommu(dev->bus);

/* reserve EMERGENCY_PAGES from bad_dma_address and up */
- iommu_range_reserve(tbl, CALGARY_MAPPING_ERROR, EMERGENCY_PAGES);
+ iommu_range_reserve(tbl, DMA_MAPPING_ERROR, EMERGENCY_PAGES);

/* avoid the BIOS/VGA first 640KB-1MB region */
/* for CalIOC2 - avoid the entire first MB */
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 1167ff0416cf..cfb422e17049 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -55,8 +55,6 @@
#include "amd_iommu_types.h"
#include "irq_remapping.h"

-#define AMD_IOMMU_MAPPING_ERROR 0
-
#define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))

#define LOOP_TIMEOUT 100000
@@ -2339,7 +2337,7 @@ static dma_addr_t __map_single(struct device *dev,
paddr &= PAGE_MASK;

address = dma_ops_alloc_iova(dev, dma_dom, pages, dma_mask);
- if (address == AMD_IOMMU_MAPPING_ERROR)
+ if (address == DMA_MAPPING_ERROR)
goto out;

prot = dir2prot(direction);
@@ -2376,7 +2374,7 @@ static dma_addr_t __map_single(struct device *dev,

dma_ops_free_iova(dma_dom, address, pages);

- return AMD_IOMMU_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

/*
@@ -2427,7 +2425,7 @@ static dma_addr_t map_page(struct device *dev, struct page *page,
if (PTR_ERR(domain) == -EINVAL)
return (dma_addr_t)paddr;
else if (IS_ERR(domain))
- return AMD_IOMMU_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;

dma_mask = *dev->dma_mask;
dma_dom = to_dma_ops_domain(domain);
@@ -2504,7 +2502,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
npages = sg_num_pages(dev, sglist, nelems);

address = dma_ops_alloc_iova(dev, dma_dom, npages, dma_mask);
- if (address == AMD_IOMMU_MAPPING_ERROR)
+ if (address == DMA_MAPPING_ERROR)
goto out_err;

prot = dir2prot(direction);
@@ -2627,7 +2625,7 @@ static void *alloc_coherent(struct device *dev, size_t size,
*dma_addr = __map_single(dev, dma_dom, page_to_phys(page),
size, DMA_BIDIRECTIONAL, dma_mask);

- if (*dma_addr == AMD_IOMMU_MAPPING_ERROR)
+ if (*dma_addr == DMA_MAPPING_ERROR)
goto out_free;

return page_address(page);
@@ -2678,11 +2676,6 @@ static int amd_iommu_dma_supported(struct device *dev, u64 mask)
return check_device(dev);
}

-static int amd_iommu_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == AMD_IOMMU_MAPPING_ERROR;
-}
-
static const struct dma_map_ops amd_iommu_dma_ops = {
.alloc = alloc_coherent,
.free = free_coherent,
@@ -2691,7 +2684,6 @@ static const struct dma_map_ops amd_iommu_dma_ops = {
.map_sg = map_sg,
.unmap_sg = unmap_sg,
.dma_supported = amd_iommu_dma_supported,
- .mapping_error = amd_iommu_mapping_error,
};

static int init_reserved_iova_ranges(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/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index f3ccf025108b..ffc4864d0ed7 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3661,8 +3661,13 @@ static dma_addr_t intel_map_page(struct device *dev, struct page *page,
enum dma_data_direction dir,
unsigned long attrs)
{
- return __intel_map_single(dev, page_to_phys(page) + offset, size,
+ dma_addr_t dma_addr;
+
+ dma_addr = __intel_map_single(dev, page_to_phys(page) + offset, size,
dir, *dev->dma_mask);
+ if (dma_addr == 0)
+ return DMA_MAPPING_ERROR;
+ return dma_addr;
}

static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
@@ -3865,11 +3870,6 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele
return nelems;
}

-static int intel_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return !dma_addr;
-}
-
static const struct dma_map_ops intel_dma_ops = {
.alloc = intel_alloc_coherent,
.free = intel_free_coherent,
@@ -3877,7 +3877,6 @@ static const struct dma_map_ops intel_dma_ops = {
.unmap_sg = intel_unmap_sg,
.map_page = intel_map_page,
.unmap_page = intel_unmap_page,
- .mapping_error = intel_mapping_error,
.dma_supported = dma_direct_supported,
};

diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c
index 701a7d6a74d5..714aac72df0e 100644
--- a/drivers/parisc/ccio-dma.c
+++ b/drivers/parisc/ccio-dma.c
@@ -110,8 +110,6 @@
#define CMD_TLB_DIRECT_WRITE 35 /* IO_COMMAND for I/O TLB Writes */
#define CMD_TLB_PURGE 33 /* IO_COMMAND to Purge I/O TLB entry */

-#define CCIO_MAPPING_ERROR (~(dma_addr_t)0)
-
struct ioa_registers {
/* Runway Supervisory Set */
int32_t unused1[12];
@@ -740,7 +738,7 @@ ccio_map_single(struct device *dev, void *addr, size_t size,
BUG_ON(!dev);
ioc = GET_IOC(dev);
if (!ioc)
- return CCIO_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;

BUG_ON(size <= 0);

@@ -1021,11 +1019,6 @@ ccio_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
DBG_RUN_SG("%s() DONE (nents %d)\n", __func__, nents);
}

-static int ccio_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == CCIO_MAPPING_ERROR;
-}
-
static const struct dma_map_ops ccio_ops = {
.dma_supported = ccio_dma_supported,
.alloc = ccio_alloc,
@@ -1034,7 +1027,6 @@ static const struct dma_map_ops ccio_ops = {
.unmap_page = ccio_unmap_page,
.map_sg = ccio_map_sg,
.unmap_sg = ccio_unmap_sg,
- .mapping_error = ccio_mapping_error,
};

#ifdef CONFIG_PROC_FS
diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index c1e599a429af..452d306ce5cb 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -93,8 +93,6 @@

#define DEFAULT_DMA_HINT_REG 0

-#define SBA_MAPPING_ERROR (~(dma_addr_t)0)
-
struct sba_device *sba_list;
EXPORT_SYMBOL_GPL(sba_list);

@@ -725,7 +723,7 @@ sba_map_single(struct device *dev, void *addr, size_t size,

ioc = GET_IOC(dev);
if (!ioc)
- return SBA_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;

/* save offset bits */
offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK;
@@ -1080,11 +1078,6 @@ sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,

}

-static int sba_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == SBA_MAPPING_ERROR;
-}
-
static const struct dma_map_ops sba_ops = {
.dma_supported = sba_dma_supported,
.alloc = sba_alloc,
@@ -1093,7 +1086,6 @@ static const struct dma_map_ops sba_ops = {
.unmap_page = sba_unmap_page,
.map_sg = sba_map_sg,
.unmap_sg = sba_unmap_sg,
- .mapping_error = sba_mapping_error,
};

diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index e50b0b5815ff..98ce79eac128 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -394,11 +394,6 @@ static void vmd_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
vmd_dma_ops(dev)->sync_sg_for_device(to_vmd_dev(dev), sg, nents, dir);
}

-static int vmd_mapping_error(struct device *dev, dma_addr_t addr)
-{
- return vmd_dma_ops(dev)->mapping_error(to_vmd_dev(dev), addr);
-}
-
static int vmd_dma_supported(struct device *dev, u64 mask)
{
return vmd_dma_ops(dev)->dma_supported(to_vmd_dev(dev), mask);
@@ -446,7 +441,6 @@ static void vmd_setup_dma_ops(struct vmd_dev *vmd)
ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_device);
ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_cpu);
ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_device);
- ASSIGN_VMD_DMA_OPS(source, dest, mapping_error);
ASSIGN_VMD_DMA_OPS(source, dest, dma_supported);
ASSIGN_VMD_DMA_OPS(source, dest, get_required_mask);
add_dma_domain(domain);
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 2a7f545bd0b5..6dc969d5ea2f 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -53,8 +53,6 @@
* API.
*/

-#define XEN_SWIOTLB_ERROR_CODE (~(dma_addr_t)0x0)
-
static char *xen_io_tlb_start, *xen_io_tlb_end;
static unsigned long xen_io_tlb_nslabs;
/*
@@ -406,7 +404,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
map = swiotlb_tbl_map_single(dev, start_dma_addr, phys, size, dir,
attrs);
if (map == SWIOTLB_MAP_ERROR)
- return XEN_SWIOTLB_ERROR_CODE;
+ return DMA_MAPPING_ERROR;

dev_addr = xen_phys_to_bus(map);
xen_dma_map_page(dev, pfn_to_page(map >> PAGE_SHIFT),
@@ -421,7 +419,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
attrs |= DMA_ATTR_SKIP_CPU_SYNC;
swiotlb_tbl_unmap_single(dev, map, size, dir, attrs);

- return XEN_SWIOTLB_ERROR_CODE;
+ return DMA_MAPPING_ERROR;
}

/*
@@ -700,11 +698,6 @@ xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
return dma_common_get_sgtable(dev, sgt, cpu_addr, handle, size, attrs);
}

-static int xen_swiotlb_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == XEN_SWIOTLB_ERROR_CODE;
-}
-
const struct dma_map_ops xen_swiotlb_dma_ops = {
.alloc = xen_swiotlb_alloc_coherent,
.free = xen_swiotlb_free_coherent,
@@ -719,5 +712,4 @@ const struct dma_map_ops xen_swiotlb_dma_ops = {
.dma_supported = xen_swiotlb_dma_supported,
.mmap = xen_swiotlb_dma_mmap,
.get_sgtable = xen_swiotlb_get_sgtable,
- .mapping_error = xen_swiotlb_mapping_error,
};
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index bd73e7a91410..e7600f92d876 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -5,8 +5,6 @@
#include <linux/dma-mapping.h>
#include <linux/mem_encrypt.h>

-#define DIRECT_MAPPING_ERROR 0
-
#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
#include <asm/dma-direct.h>
#else
@@ -73,5 +71,4 @@ dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
enum dma_data_direction dir, unsigned long attrs);
int dma_direct_supported(struct device *dev, u64 mask);
-int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr);
#endif /* _LINUX_DMA_DIRECT_H */
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);
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 15bd41447025..c08779649ac0 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -128,11 +128,15 @@ struct dma_map_ops {
enum dma_data_direction dir);
void (*cache_sync)(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction);
- int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
int (*dma_supported)(struct device *dev, u64 mask);
u64 (*get_required_mask)(struct device *dev);
};

+/*
+ * Error return value from ->map_page.
+ */
+#define DMA_MAPPING_ERROR (~(dma_addr_t)0x0)
+
extern const struct dma_map_ops dma_direct_ops;
extern const struct dma_map_ops dma_virt_ops;

@@ -573,12 +577,8 @@ static inline void dma_free_coherent(struct device *dev, size_t size,

static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
- const struct dma_map_ops *ops = get_dma_ops(dev);
-
debug_dma_mapping_error(dev, dma_addr);
- if (ops->mapping_error)
- return ops->mapping_error(dev, dma_addr);
- return 0;
+ return dma_addr == DMA_MAPPING_ERROR;
}

static inline void dma_check_mask(struct device *dev, u64 mask)
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 22a12ab5a5e9..d4335a03193a 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -265,7 +265,7 @@ dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
dma_addr_t dma_addr = phys_to_dma(dev, phys);

if (!check_addr(dev, dma_addr, size, __func__))
- return DIRECT_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;

if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
dma_direct_sync_single_for_device(dev, dma_addr, size, dir);
@@ -312,11 +312,6 @@ int dma_direct_supported(struct device *dev, u64 mask)
return mask >= phys_to_dma(dev, min_mask);
}

-int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == DIRECT_MAPPING_ERROR;
-}
-
const struct dma_map_ops dma_direct_ops = {
.alloc = dma_direct_alloc,
.free = dma_direct_free,
@@ -335,7 +330,6 @@ const struct dma_map_ops dma_direct_ops = {
#endif
.get_required_mask = dma_direct_get_required_mask,
.dma_supported = dma_direct_supported,
- .mapping_error = dma_direct_mapping_error,
.cache_sync = arch_dma_cache_sync,
};
EXPORT_SYMBOL(dma_direct_ops);
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 5731daa09a32..42b0c7d50d2b 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -631,21 +631,21 @@ static dma_addr_t swiotlb_bounce_page(struct device *dev, phys_addr_t *phys,
if (unlikely(swiotlb_force == SWIOTLB_NO_FORCE)) {
dev_warn_ratelimited(dev,
"Cannot do DMA to address %pa\n", phys);
- return DIRECT_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

/* Oh well, have to allocate and map a bounce buffer. */
*phys = swiotlb_tbl_map_single(dev, __phys_to_dma(dev, io_tlb_start),
*phys, size, dir, attrs);
if (*phys == SWIOTLB_MAP_ERROR)
- return DIRECT_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;

/* Ensure that the address returned is DMA'ble */
dma_addr = __phys_to_dma(dev, *phys);
if (unlikely(!dma_capable(dev, dma_addr, size))) {
swiotlb_tbl_unmap_single(dev, *phys, size, dir,
attrs | DMA_ATTR_SKIP_CPU_SYNC);
- return DIRECT_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

return dma_addr;
@@ -788,7 +788,7 @@ swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nelems,
for_each_sg(sgl, sg, nelems, i) {
sg->dma_address = swiotlb_map_page(dev, sg_page(sg), sg->offset,
sg->length, dir, attrs);
- if (sg->dma_address == DIRECT_MAPPING_ERROR)
+ if (sg->dma_address == DMA_MAPPING_ERROR)
goto out_error;
sg_dma_len(sg) = sg->length;
}
@@ -868,7 +868,6 @@ swiotlb_dma_supported(struct device *hwdev, u64 mask)
}

const struct dma_map_ops swiotlb_dma_ops = {
- .mapping_error = dma_direct_mapping_error,
.alloc = dma_direct_alloc,
.free = dma_direct_free,
.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
--
2.19.1

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