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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

13
drivers/gpu/drm/msm/msm_drv.c
View File

@@ -238,11 +238,10 @@ static int msm_drm_uninit(struct device *dev)
}
if (priv->vram.paddr) {
DEFINE_DMA_ATTRS(attrs);
dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &attrs);
unsigned long attrs = DMA_ATTR_NO_KERNEL_MAPPING;
drm_mm_takedown(&priv->vram.mm);
dma_free_attrs(dev, priv->vram.size, NULL,
priv->vram.paddr, &attrs);
priv->vram.paddr, attrs);
}
component_unbind_all(dev, ddev);
@@ -310,21 +309,21 @@ static int msm_init_vram(struct drm_device *dev)
}
if (size) {
DEFINE_DMA_ATTRS(attrs);
unsigned long attrs = 0;
void *p;
priv->vram.size = size;
drm_mm_init(&priv->vram.mm, 0, (size >> PAGE_SHIFT) - 1);
dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &attrs);
dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
attrs |= DMA_ATTR_WRITE_COMBINE;
/* note that for no-kernel-mapping, the vaddr returned
* is bogus, but non-null if allocation succeeded:
*/
p = dma_alloc_attrs(dev->dev, size,
&priv->vram.paddr, GFP_KERNEL, &attrs);
&priv->vram.paddr, GFP_KERNEL, attrs);
if (!p) {
dev_err(dev->dev, "failed to allocate VRAM\n");
priv->vram.paddr = 0;