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iommu/dma: Remove the flush_page callback
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We now have a arch_dma_prep_coherent architecture hook that is used
for the generic DMA remap allocator, and we should use the same
interface for the dma-iommu code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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Christoph Hellwig authored and Joerg Roedel committed May 27, 2019
1 parent 185da89 commit af751d4
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Showing 3 changed files with 5 additions and 14 deletions.
8 changes: 1 addition & 7 deletions arch/arm64/mm/dma-mapping.c
Original file line number Diff line number Diff line change
Expand Up @@ -104,12 +104,6 @@ arch_initcall(arm64_dma_init);
#include <linux/platform_device.h>
#include <linux/amba/bus.h>

/* Thankfully, all cache ops are by VA so we can ignore phys here */
static void flush_page(struct device *dev, const void *virt, phys_addr_t phys)
{
__dma_flush_area(virt, PAGE_SIZE);
}

static void *__iommu_alloc_attrs(struct device *dev, size_t size,
dma_addr_t *handle, gfp_t gfp,
unsigned long attrs)
Expand Down Expand Up @@ -186,7 +180,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
struct page **pages;

pages = iommu_dma_alloc(dev, iosize, gfp, attrs, ioprot,
handle, flush_page);
handle);
if (!pages)
return NULL;

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8 changes: 3 additions & 5 deletions drivers/iommu/dma-iommu.c
Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
#include <linux/acpi_iort.h>
#include <linux/device.h>
#include <linux/dma-iommu.h>
#include <linux/dma-noncoherent.h>
#include <linux/gfp.h>
#include <linux/huge_mm.h>
#include <linux/iommu.h>
Expand Down Expand Up @@ -560,8 +561,6 @@ void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
* @attrs: DMA attributes for this allocation
* @prot: IOMMU mapping flags
* @handle: Out argument for allocated DMA handle
* @flush_page: Arch callback which must ensure PAGE_SIZE bytes from the
* given VA/PA are visible to the given non-coherent device.
*
* If @size is less than PAGE_SIZE, then a full CPU page will be allocated,
* but an IOMMU which supports smaller pages might not map the whole thing.
Expand All @@ -570,8 +569,7 @@ void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
* or NULL on failure.
*/
struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
unsigned long attrs, int prot, dma_addr_t *handle,
void (*flush_page)(struct device *, const void *, phys_addr_t))
unsigned long attrs, int prot, dma_addr_t *handle)
{
struct iommu_domain *domain = iommu_get_dma_domain(dev);
struct iommu_dma_cookie *cookie = domain->iova_cookie;
Expand Down Expand Up @@ -615,7 +613,7 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
*/
sg_miter_start(&miter, sgt.sgl, sgt.orig_nents, SG_MITER_FROM_SG);
while (sg_miter_next(&miter))
flush_page(dev, miter.addr, page_to_phys(miter.page));
arch_dma_prep_coherent(miter.page, PAGE_SIZE);
sg_miter_stop(&miter);
}

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3 changes: 1 addition & 2 deletions include/linux/dma-iommu.h
Original file line number Diff line number Diff line change
Expand Up @@ -44,8 +44,7 @@ int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
* the arch code to take care of attributes and cache maintenance
*/
struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
unsigned long attrs, int prot, dma_addr_t *handle,
void (*flush_page)(struct device *, const void *, phys_addr_t));
unsigned long attrs, int prot, dma_addr_t *handle);
void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
dma_addr_t *handle);

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