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dma-mapping: replace dmam_alloc_noncoherent with dmam_alloc_attrs

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dmam_alloc_noncoherent is a trivial wrapper around dmam_alloc_attrs,
that hardcodes one particular flag.  Make the devres code more
flexible by allowing the callers to pass arbitrary flags.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Christoph Hellwig 2017-06-12 19:15:04 +02:00
parent 03b643866d
commit 63d36c9550
4 changed files with 23 additions and 25 deletions
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2
Documentation/driver-model/devres.txt
View File

@ -240,7 +240,7 @@ CLOCK
DMA
dmam_alloc_coherent()
dmam_alloc_noncoherent()
dmam_alloc_attrs()
dmam_declare_coherent_memory()
dmam_free_coherent()
dmam_pool_create()

36
drivers/base/dma-mapping.c
View File

@ -22,20 +22,15 @@ struct dma_devres {
size_t size;
void *vaddr;
dma_addr_t dma_handle;
unsigned long attrs;
};
static void dmam_coherent_release(struct device *dev, void *res)
static void dmam_release(struct device *dev, void *res)
{
struct dma_devres *this = res;
dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle);
}
static void dmam_noncoherent_release(struct device *dev, void *res)
{
struct dma_devres *this = res;
dma_free_noncoherent(dev, this->size, this->vaddr, this->dma_handle);
dma_free_attrs(dev, this->size, this->vaddr, this->dma_handle,
this->attrs);
}
static int dmam_match(struct device *dev, void *res, void *match_data)
@ -69,7 +64,7 @@ void *dmam_alloc_coherent(struct device *dev, size_t size,
struct dma_devres *dr;
void *vaddr;
dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp);
dr = devres_alloc(dmam_release, sizeof(*dr), gfp);
if (!dr)
return NULL;
@ -104,35 +99,35 @@ void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
struct dma_devres match_data = { size, vaddr, dma_handle };
dma_free_coherent(dev, size, vaddr, dma_handle);
WARN_ON(devres_destroy(dev, dmam_coherent_release, dmam_match,
&match_data));
WARN_ON(devres_destroy(dev, dmam_release, dmam_match, &match_data));
}
EXPORT_SYMBOL(dmam_free_coherent);
/**
* dmam_alloc_non_coherent - Managed dma_alloc_noncoherent()
* dmam_alloc_attrs - Managed dma_alloc_attrs()
* @dev: Device to allocate non_coherent memory for
* @size: Size of allocation
* @dma_handle: Out argument for allocated DMA handle
* @gfp: Allocation flags
* @attrs: Flags in the DMA_ATTR_* namespace.
*
* Managed dma_alloc_noncoherent(). Memory allocated using this
* function will be automatically released on driver detach.
* Managed dma_alloc_attrs(). Memory allocated using this function will be
* automatically released on driver detach.
*
* RETURNS:
* Pointer to allocated memory on success, NULL on failure.
*/
void *dmam_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp)
void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs)
{
struct dma_devres *dr;
void *vaddr;
dr = devres_alloc(dmam_noncoherent_release, sizeof(*dr), gfp);
dr = devres_alloc(dmam_release, sizeof(*dr), gfp);
if (!dr)
return NULL;
vaddr = dma_alloc_noncoherent(dev, size, dma_handle, gfp);
vaddr = dma_alloc_attrs(dev, size, dma_handle, gfp, attrs);
if (!vaddr) {
devres_free(dr);
return NULL;
@ -141,12 +136,13 @@ void *dmam_alloc_noncoherent(struct device *dev, size_t size,
dr->vaddr = vaddr;
dr->dma_handle = *dma_handle;
dr->size = size;
dr->attrs = attrs;
devres_add(dev, dr);
return vaddr;
}
EXPORT_SYMBOL(dmam_alloc_noncoherent);
EXPORT_SYMBOL(dmam_alloc_attrs);
#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT

5
drivers/video/fbdev/au1200fb.c
View File

@ -1694,9 +1694,10 @@ static int au1200fb_drv_probe(struct platform_device *dev)
/* Allocate the framebuffer to the maximum screen size */
fbdev->fb_len = (win->w[plane].xres * win->w[plane].yres * bpp) / 8;
fbdev->fb_mem = dmam_alloc_noncoherent(&dev->dev,
fbdev->fb_mem = dmam_alloc_attrs(&dev->dev,
PAGE_ALIGN(fbdev->fb_len),
&fbdev->fb_phys, GFP_KERNEL);
&fbdev->fb_phys, GFP_KERNEL,
DMA_ATTR_NON_CONSISTENT);
if (!fbdev->fb_mem) {
print_err("fail to allocate frambuffer (size: %dK))",
fbdev->fb_len / 1024);

5
include/linux/dma-mapping.h
View File

@ -734,8 +734,9 @@ extern void *dmam_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp);
extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle);
extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp);
extern void *dmam_alloc_attrs(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
unsigned long attrs);
#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
extern int dmam_declare_coherent_memory(struct device *dev,
phys_addr_t phys_addr,