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dma-mapping: use unsigned long for dma_attrs

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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>
This commit is contained in:
Krzysztof Kozlowski
2016-08-03 13:46:00 -07:00
committed by Linus Torvalds
parent 1605d2715a
commit 00085f1efa
111 changed files with 705 additions and 804 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
arch/tile/kernel/pci-dma.c
View File

@@ -34,7 +34,7 @@
static void *tile_dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
struct dma_attrs *attrs)
unsigned long attrs)
{
u64 dma_mask = (dev && dev->coherent_dma_mask) ?
dev->coherent_dma_mask : DMA_BIT_MASK(32);
@@ -78,7 +78,7 @@ static void *tile_dma_alloc_coherent(struct device *dev, size_t size,
*/
static void tile_dma_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
struct dma_attrs *attrs)
unsigned long attrs)
{
homecache_free_pages((unsigned long)vaddr, get_order(size));
}
@@ -202,7 +202,7 @@ static void __dma_complete_pa_range(dma_addr_t dma_addr, size_t size,
static int tile_dma_map_sg(struct device *dev, struct scatterlist *sglist,
int nents, enum dma_data_direction direction,
struct dma_attrs *attrs)
unsigned long attrs)
{
struct scatterlist *sg;
int i;
@@ -224,7 +224,7 @@ static int tile_dma_map_sg(struct device *dev, struct scatterlist *sglist,
static void tile_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
int nents, enum dma_data_direction direction,
struct dma_attrs *attrs)
unsigned long attrs)
{
struct scatterlist *sg;
int i;
@@ -240,7 +240,7 @@ static void tile_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
static dma_addr_t tile_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction direction,
struct dma_attrs *attrs)
unsigned long attrs)
{
BUG_ON(!valid_dma_direction(direction));
@@ -252,7 +252,7 @@ static dma_addr_t tile_dma_map_page(struct device *dev, struct page *page,
static void tile_dma_unmap_page(struct device *dev, dma_addr_t dma_address,
size_t size, enum dma_data_direction direction,
struct dma_attrs *attrs)
unsigned long attrs)
{
BUG_ON(!valid_dma_direction(direction));
@@ -343,7 +343,7 @@ EXPORT_SYMBOL(tile_dma_map_ops);
static void *tile_pci_dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
struct dma_attrs *attrs)
unsigned long attrs)
{
int node = dev_to_node(dev);
int order = get_order(size);
@@ -368,14 +368,14 @@ static void *tile_pci_dma_alloc_coherent(struct device *dev, size_t size,
*/
static void tile_pci_dma_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
struct dma_attrs *attrs)
unsigned long attrs)
{
homecache_free_pages((unsigned long)vaddr, get_order(size));
}
static int tile_pci_dma_map_sg(struct device *dev, struct scatterlist *sglist,
int nents, enum dma_data_direction direction,
struct dma_attrs *attrs)
unsigned long attrs)
{
struct scatterlist *sg;
int i;
@@ -400,7 +400,7 @@ static int tile_pci_dma_map_sg(struct device *dev, struct scatterlist *sglist,
static void tile_pci_dma_unmap_sg(struct device *dev,
struct scatterlist *sglist, int nents,
enum dma_data_direction direction,
struct dma_attrs *attrs)
unsigned long attrs)
{
struct scatterlist *sg;
int i;
@@ -416,7 +416,7 @@ static void tile_pci_dma_unmap_sg(struct device *dev,
static dma_addr_t tile_pci_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction direction,
struct dma_attrs *attrs)
unsigned long attrs)
{
BUG_ON(!valid_dma_direction(direction));
@@ -429,7 +429,7 @@ static dma_addr_t tile_pci_dma_map_page(struct device *dev, struct page *page,
static void tile_pci_dma_unmap_page(struct device *dev, dma_addr_t dma_address,
size_t size,
enum dma_data_direction direction,
struct dma_attrs *attrs)
unsigned long attrs)
{
BUG_ON(!valid_dma_direction(direction));
@@ -531,7 +531,7 @@ EXPORT_SYMBOL(gx_pci_dma_map_ops);
#ifdef CONFIG_SWIOTLB
static void *tile_swiotlb_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
struct dma_attrs *attrs)
unsigned long attrs)
{
gfp |= GFP_DMA;
return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
@@ -539,7 +539,7 @@ static void *tile_swiotlb_alloc_coherent(struct device *dev, size_t size,
static void tile_swiotlb_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_addr,
struct dma_attrs *attrs)
unsigned long attrs)
{
swiotlb_free_coherent(dev, size, vaddr, dma_addr);
}