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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

2
drivers/gpu/drm/exynos/exynos_drm_fbdev.c
View File

@@ -52,7 +52,7 @@ static int exynos_drm_fb_mmap(struct fb_info *info,
ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
exynos_gem->dma_addr, exynos_gem->size,
&exynos_gem->dma_attrs);
exynos_gem->dma_attrs);
if (ret < 0) {
DRM_ERROR("failed to mmap.\n");
return ret;

12
drivers/gpu/drm/exynos/exynos_drm_g2d.c
View File

@@ -17,7 +17,6 @@
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/dma-mapping.h>
#include <linux/dma-attrs.h>
#include <linux/of.h>
#include <drm/drmP.h>
@@ -235,7 +234,7 @@ struct g2d_data {
struct mutex cmdlist_mutex;
dma_addr_t cmdlist_pool;
void *cmdlist_pool_virt;
struct dma_attrs cmdlist_dma_attrs;
unsigned long cmdlist_dma_attrs;
/* runqueue*/
struct g2d_runqueue_node *runqueue_node;
@@ -256,13 +255,12 @@ static int g2d_init_cmdlist(struct g2d_data *g2d)
int ret;
struct g2d_buf_info *buf_info;
init_dma_attrs(&g2d->cmdlist_dma_attrs);
dma_set_attr(DMA_ATTR_WRITE_COMBINE, &g2d->cmdlist_dma_attrs);
g2d->cmdlist_dma_attrs = DMA_ATTR_WRITE_COMBINE;
g2d->cmdlist_pool_virt = dma_alloc_attrs(to_dma_dev(subdrv->drm_dev),
G2D_CMDLIST_POOL_SIZE,
&g2d->cmdlist_pool, GFP_KERNEL,
&g2d->cmdlist_dma_attrs);
g2d->cmdlist_dma_attrs);
if (!g2d->cmdlist_pool_virt) {
dev_err(dev, "failed to allocate dma memory\n");
return -ENOMEM;
@@ -295,7 +293,7 @@ static int g2d_init_cmdlist(struct g2d_data *g2d)
err:
dma_free_attrs(to_dma_dev(subdrv->drm_dev), G2D_CMDLIST_POOL_SIZE,
g2d->cmdlist_pool_virt,
g2d->cmdlist_pool, &g2d->cmdlist_dma_attrs);
g2d->cmdlist_pool, g2d->cmdlist_dma_attrs);
return ret;
}
@@ -309,7 +307,7 @@ static void g2d_fini_cmdlist(struct g2d_data *g2d)
dma_free_attrs(to_dma_dev(subdrv->drm_dev),
G2D_CMDLIST_POOL_SIZE,
g2d->cmdlist_pool_virt,
g2d->cmdlist_pool, &g2d->cmdlist_dma_attrs);
g2d->cmdlist_pool, g2d->cmdlist_dma_attrs);
}
}

20
drivers/gpu/drm/exynos/exynos_drm_gem.c
View File

@@ -24,7 +24,7 @@
static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
{
struct drm_device *dev = exynos_gem->base.dev;
enum dma_attr attr;
unsigned long attr;
unsigned int nr_pages;
struct sg_table sgt;
int ret = -ENOMEM;
@@ -34,7 +34,7 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
return 0;
}
init_dma_attrs(&exynos_gem->dma_attrs);
exynos_gem->dma_attrs = 0;
/*
* if EXYNOS_BO_CONTIG, fully physically contiguous memory
@@ -42,7 +42,7 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
* as possible.
*/
if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &exynos_gem->dma_attrs);
exynos_gem->dma_attrs |= DMA_ATTR_FORCE_CONTIGUOUS;
/*
* if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
@@ -54,8 +54,8 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
else
attr = DMA_ATTR_NON_CONSISTENT;
dma_set_attr(attr, &exynos_gem->dma_attrs);
dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &exynos_gem->dma_attrs);
exynos_gem->dma_attrs |= attr;
exynos_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
nr_pages = exynos_gem->size >> PAGE_SHIFT;
@@ -67,7 +67,7 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
&exynos_gem->dma_addr, GFP_KERNEL,
&exynos_gem->dma_attrs);
exynos_gem->dma_attrs);
if (!exynos_gem->cookie) {
DRM_ERROR("failed to allocate buffer.\n");
goto err_free;
@@ -75,7 +75,7 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
ret = dma_get_sgtable_attrs(to_dma_dev(dev), &sgt, exynos_gem->cookie,
exynos_gem->dma_addr, exynos_gem->size,
&exynos_gem->dma_attrs);
exynos_gem->dma_attrs);
if (ret < 0) {
DRM_ERROR("failed to get sgtable.\n");
goto err_dma_free;
@@ -99,7 +99,7 @@ err_sgt_free:
sg_free_table(&sgt);
err_dma_free:
dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
exynos_gem->dma_addr, &exynos_gem->dma_attrs);
exynos_gem->dma_addr, exynos_gem->dma_attrs);
err_free:
drm_free_large(exynos_gem->pages);
@@ -120,7 +120,7 @@ static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
(dma_addr_t)exynos_gem->dma_addr,
&exynos_gem->dma_attrs);
exynos_gem->dma_attrs);
drm_free_large(exynos_gem->pages);
}
@@ -346,7 +346,7 @@ static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
exynos_gem->dma_addr, exynos_gem->size,
&exynos_gem->dma_attrs);
exynos_gem->dma_attrs);
if (ret < 0) {
DRM_ERROR("failed to mmap.\n");
return ret;

2
drivers/gpu/drm/exynos/exynos_drm_gem.h
View File

@@ -50,7 +50,7 @@ struct exynos_drm_gem {
void *cookie;
void __iomem *kvaddr;
dma_addr_t dma_addr;
struct dma_attrs dma_attrs;
unsigned long dma_attrs;
struct page **pages;
struct sg_table *sgt;
};