dma-mapping: use unsigned long for dma_attrs
The dma-mapping core and the implementations do not change the DMA
attributes passed by pointer. Thus the pointer can point to const data.
However the attributes do not have to be a bitfield. Instead unsigned
long will do fine:
1. This is just simpler. Both in terms of reading the code and setting
attributes. Instead of initializing local attributes on the stack
and passing pointer to it to dma_set_attr(), just set the bits.
2. It brings safeness and checking for const correctness because the
attributes are passed by value.
Semantic patches for this change (at least most of them):
virtual patch
virtual context
@r@
identifier f, attrs;
@@
f(...,
- struct dma_attrs *attrs
+ unsigned long attrs
, ...)
{
...
}
@@
identifier r.f;
@@
f(...,
- NULL
+ 0
)
and
// Options: --all-includes
virtual patch
virtual context
@r@
identifier f, attrs;
type t;
@@
t f(..., struct dma_attrs *attrs);
@@
identifier r.f;
@@
f(...,
- NULL
+ 0
)
Link: http://lkml.kernel.org/r/1468399300-5399-2-git-send-email-k.kozlowski@samsung.com
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Acked-by: Mark Salter <msalter@redhat.com> [c6x]
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> [cris]
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> [drm]
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Acked-by: Joerg Roedel <jroedel@suse.de> [iommu]
Acked-by: Fabien Dessenne <fabien.dessenne@st.com> [bdisp]
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com> [vb2-core]
Acked-by: David Vrabel <david.vrabel@citrix.com> [xen]
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [xen swiotlb]
Acked-by: Joerg Roedel <jroedel@suse.de> [iommu]
Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon]
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> [s390]
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> [avr32]
Acked-by: Vineet Gupta <vgupta@synopsys.com> [arc]
Acked-by: Robin Murphy <robin.murphy@arm.com> [arm64 and dma-iommu]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index f6c55af..c4284c4 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -32,10 +32,10 @@
static int swiotlb __read_mostly;
-static pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot,
+static pgprot_t __get_dma_pgprot(unsigned long attrs, pgprot_t prot,
bool coherent)
{
- if (!coherent || dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs))
+ if (!coherent || (attrs & DMA_ATTR_WRITE_COMBINE))
return pgprot_writecombine(prot);
return prot;
}
@@ -91,7 +91,7 @@
static void *__dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
if (dev == NULL) {
WARN_ONCE(1, "Use an actual device structure for DMA allocation\n");
@@ -121,7 +121,7 @@
static void __dma_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
bool freed;
phys_addr_t paddr = dma_to_phys(dev, dma_handle);
@@ -140,7 +140,7 @@
static void *__dma_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
struct page *page;
void *ptr, *coherent_ptr;
@@ -188,7 +188,7 @@
static void __dma_free(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
void *swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle));
@@ -205,7 +205,7 @@
static dma_addr_t __swiotlb_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
dma_addr_t dev_addr;
@@ -219,7 +219,7 @@
static void __swiotlb_unmap_page(struct device *dev, dma_addr_t dev_addr,
size_t size, enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
if (!is_device_dma_coherent(dev))
__dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
@@ -228,7 +228,7 @@
static int __swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
int nelems, enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
struct scatterlist *sg;
int i, ret;
@@ -245,7 +245,7 @@
static void __swiotlb_unmap_sg_attrs(struct device *dev,
struct scatterlist *sgl, int nelems,
enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
struct scatterlist *sg;
int i;
@@ -306,7 +306,7 @@
static int __swiotlb_mmap(struct device *dev,
struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
int ret = -ENXIO;
unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >>
@@ -333,7 +333,7 @@
static int __swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t handle, size_t size,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
int ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
@@ -435,21 +435,21 @@
static void *__dummy_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
return NULL;
}
static void __dummy_free(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
}
static int __dummy_mmap(struct device *dev,
struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
return -ENXIO;
}
@@ -457,20 +457,20 @@
static dma_addr_t __dummy_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
return DMA_ERROR_CODE;
}
static void __dummy_unmap_page(struct device *dev, dma_addr_t dev_addr,
size_t size, enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
}
static int __dummy_map_sg(struct device *dev, struct scatterlist *sgl,
int nelems, enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
return 0;
}
@@ -478,7 +478,7 @@
static void __dummy_unmap_sg(struct device *dev,
struct scatterlist *sgl, int nelems,
enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
}
@@ -553,7 +553,7 @@
static void *__iommu_alloc_attrs(struct device *dev, size_t size,
dma_addr_t *handle, gfp_t gfp,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
bool coherent = is_device_dma_coherent(dev);
int ioprot = dma_direction_to_prot(DMA_BIDIRECTIONAL, coherent);
@@ -613,7 +613,7 @@
}
static void __iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr,
- dma_addr_t handle, struct dma_attrs *attrs)
+ dma_addr_t handle, unsigned long attrs)
{
size_t iosize = size;
@@ -629,7 +629,7 @@
* Hence how dodgy the below logic looks...
*/
if (__in_atomic_pool(cpu_addr, size)) {
- iommu_dma_unmap_page(dev, handle, iosize, 0, NULL);
+ iommu_dma_unmap_page(dev, handle, iosize, 0, 0);
__free_from_pool(cpu_addr, size);
} else if (is_vmalloc_addr(cpu_addr)){
struct vm_struct *area = find_vm_area(cpu_addr);
@@ -639,14 +639,14 @@
iommu_dma_free(dev, area->pages, iosize, &handle);
dma_common_free_remap(cpu_addr, size, VM_USERMAP);
} else {
- iommu_dma_unmap_page(dev, handle, iosize, 0, NULL);
+ iommu_dma_unmap_page(dev, handle, iosize, 0, 0);
__free_pages(virt_to_page(cpu_addr), get_order(size));
}
}
static int __iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
struct vm_struct *area;
int ret;
@@ -666,7 +666,7 @@
static int __iommu_get_sgtable(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t dma_addr,
- size_t size, struct dma_attrs *attrs)
+ size_t size, unsigned long attrs)
{
unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
struct vm_struct *area = find_vm_area(cpu_addr);
@@ -707,14 +707,14 @@
static dma_addr_t __iommu_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
bool coherent = is_device_dma_coherent(dev);
int prot = dma_direction_to_prot(dir, coherent);
dma_addr_t dev_addr = iommu_dma_map_page(dev, page, offset, size, prot);
if (!iommu_dma_mapping_error(dev, dev_addr) &&
- !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
+ (attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
__iommu_sync_single_for_device(dev, dev_addr, size, dir);
return dev_addr;
@@ -722,9 +722,9 @@
static void __iommu_unmap_page(struct device *dev, dma_addr_t dev_addr,
size_t size, enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
- if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
+ if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
__iommu_sync_single_for_cpu(dev, dev_addr, size, dir);
iommu_dma_unmap_page(dev, dev_addr, size, dir, attrs);
@@ -760,11 +760,11 @@
static int __iommu_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
int nelems, enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
bool coherent = is_device_dma_coherent(dev);
- if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
+ if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
__iommu_sync_sg_for_device(dev, sgl, nelems, dir);
return iommu_dma_map_sg(dev, sgl, nelems,
@@ -774,9 +774,9 @@
static void __iommu_unmap_sg_attrs(struct device *dev,
struct scatterlist *sgl, int nelems,
enum dma_data_direction dir,
- struct dma_attrs *attrs)
+ unsigned long attrs)
{
- if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
+ if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
__iommu_sync_sg_for_cpu(dev, sgl, nelems, dir);
iommu_dma_unmap_sg(dev, sgl, nelems, dir, attrs);