@@ -1055,34 +1055,6 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
return cpu_addr;
}
-#ifdef CONFIG_DMA_REMAP
-static void *iommu_dma_alloc_noncoherent(struct device *dev, size_t size,
- dma_addr_t *handle, enum dma_data_direction dir, gfp_t gfp)
-{
- if (!gfpflags_allow_blocking(gfp)) {
- struct page *page;
-
- page = dma_common_alloc_pages(dev, size, handle, dir, gfp);
- if (!page)
- return NULL;
- return page_address(page);
- }
-
- return iommu_dma_alloc_remap(dev, size, handle, gfp | __GFP_ZERO,
- PAGE_KERNEL, 0);
-}
-
-static void iommu_dma_free_noncoherent(struct device *dev, size_t size,
- void *cpu_addr, dma_addr_t handle, enum dma_data_direction dir)
-{
- __iommu_dma_unmap(dev, handle, size);
- __iommu_dma_free(dev, size, cpu_addr);
-}
-#else
-#define iommu_dma_alloc_noncoherent NULL
-#define iommu_dma_free_noncoherent NULL
-#endif /* CONFIG_DMA_REMAP */
-
static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
@@ -1153,8 +1125,6 @@ static const struct dma_map_ops iommu_dma_ops = {
.free = iommu_dma_free,
.alloc_pages = dma_common_alloc_pages,
.free_pages = dma_common_free_pages,
- .alloc_noncoherent = iommu_dma_alloc_noncoherent,
- .free_noncoherent = iommu_dma_free_noncoherent,
.mmap = iommu_dma_mmap,
.get_sgtable = iommu_dma_get_sgtable,
.map_page = iommu_dma_map_page,
@@ -74,11 +74,6 @@ struct dma_map_ops {
gfp_t gfp);
void (*free_pages)(struct device *dev, size_t size, struct page *vaddr,
dma_addr_t dma_handle, enum dma_data_direction dir);
- void* (*alloc_noncoherent)(struct device *dev, size_t size,
- dma_addr_t *dma_handle, enum dma_data_direction dir,
- gfp_t gfp);
- void (*free_noncoherent)(struct device *dev, size_t size, void *vaddr,
- dma_addr_t dma_handle, enum dma_data_direction dir);
int (*mmap)(struct device *, struct vm_area_struct *,
void *, dma_addr_t, size_t,
unsigned long attrs);
@@ -513,40 +513,19 @@ EXPORT_SYMBOL_GPL(dma_free_pages);
void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
{
- const struct dma_map_ops *ops = get_dma_ops(dev);
- void *vaddr;
-
- if (!ops || !ops->alloc_noncoherent) {
- struct page *page;
-
- page = dma_alloc_pages(dev, size, dma_handle, dir, gfp);
- if (!page)
- return NULL;
- return page_address(page);
- }
+ struct page *page;
- size = PAGE_ALIGN(size);
- vaddr = ops->alloc_noncoherent(dev, size, dma_handle, dir, gfp);
- if (vaddr)
- debug_dma_map_page(dev, virt_to_page(vaddr), 0, size, dir,
- *dma_handle);
- return vaddr;
+ page = dma_alloc_pages(dev, size, dma_handle, dir, gfp);
+ if (!page)
+ return NULL;
+ return page_address(page);
}
EXPORT_SYMBOL_GPL(dma_alloc_noncoherent);
void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, enum dma_data_direction dir)
{
- const struct dma_map_ops *ops = get_dma_ops(dev);
-
- if (!ops || !ops->free_noncoherent) {
- dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir);
- return;
- }
-
- size = PAGE_ALIGN(size);
- debug_dma_unmap_page(dev, dma_handle, size, dir);
- ops->free_noncoherent(dev, size, vaddr, dma_handle, dir);
+ dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir);
}
EXPORT_SYMBOL_GPL(dma_free_noncoherent);
It turns out allowing non-contigous allocations here was a rather bad idea, as we'll now need to define ways to get the pages for mmaping or dma_buf sharing. Revert this change and stick to the original concept. A different API for the use case of non-contigous allocations will be added back later. Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/iommu/dma-iommu.c | 30 ------------------------------ include/linux/dma-mapping.h | 5 ----- kernel/dma/mapping.c | 33 ++++++--------------------------- 3 files changed, 6 insertions(+), 62 deletions(-)