Commit 9848e48f authored by Marek Szyprowski's avatar Marek Szyprowski
Browse files

ARM: dma-mapping: add support for CMA regions placed in highmem zone 



This patch adds missing pieces to correctly support memory pages served
from CMA regions placed in high memory zones. Please note that the default
global CMA area is still put into lowmem and is limited by optional
architecture specific DMA zone. One can however put device specific CMA
regions in high memory zone to reduce lowmem usage.

Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Acked-by: default avatarMichal Nazarewicz <mina86@mina86.com>
parent 18177d12

arch/arm/mm/dma-mapping.c

+42 −15
Original line number Diff line number Diff line
@@ -186,13 +186,24 @@ static u64 get_coherent_dma_mask(struct device *dev) 


static void __dma_clear_buffer(struct page *page, size_t size)

{

	void *ptr;

	/*

	 * Ensure that the allocated pages are zeroed, and that any data

	 * lurking in the kernel direct-mapped region is invalidated.

	 */

	ptr = page_address(page);

	if (ptr) {

	if (PageHighMem(page)) {

		phys_addr_t base = __pfn_to_phys(page_to_pfn(page));

		phys_addr_t end = base + size;

		while (size > 0) {

			void *ptr = kmap_atomic(page);

			memset(ptr, 0, PAGE_SIZE);

			dmac_flush_range(ptr, ptr + PAGE_SIZE);

			kunmap_atomic(ptr);

			page++;

			size -= PAGE_SIZE;

		}

		outer_flush_range(base, end);

	} else {

		void *ptr = page_address(page);

		memset(ptr, 0, size);

		dmac_flush_range(ptr, ptr + size);

		outer_flush_range(__pa(ptr), __pa(ptr) + size);
@@ -243,7 +254,8 @@ static void __dma_free_buffer(struct page *page, size_t size) 
#endif



static void *__alloc_from_contiguous(struct device *dev, size_t size,

				     pgprot_t prot, struct page **ret_page);

				     pgprot_t prot, struct page **ret_page,

				     const void *caller);



static void *__alloc_remap_buffer(struct device *dev, size_t size, gfp_t gfp,

				 pgprot_t prot, struct page **ret_page,
@@ -346,10 +358,11 @@ static int __init atomic_pool_init(void) 
		goto no_pages;



	if (IS_ENABLED(CONFIG_CMA))

		ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page);

		ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page,

					      atomic_pool_init);

	else

		ptr = __alloc_remap_buffer(NULL, pool->size, GFP_KERNEL, prot,

					   &page, NULL);

					   &page, atomic_pool_init);

	if (ptr) {

		int i;
@@ -542,26 +555,40 @@ static int __free_from_pool(void *start, size_t size) 
}



static void *__alloc_from_contiguous(struct device *dev, size_t size,

				     pgprot_t prot, struct page **ret_page)

				     pgprot_t prot, struct page **ret_page,

				     const void *caller)

{

	unsigned long order = get_order(size);

	size_t count = size >> PAGE_SHIFT;

	struct page *page;

	void *ptr;



	page = dma_alloc_from_contiguous(dev, count, order);

	if (!page)

		return NULL;



	__dma_clear_buffer(page, size);

	__dma_remap(page, size, prot);



	if (PageHighMem(page)) {

		ptr = __dma_alloc_remap(page, size, GFP_KERNEL, prot, caller);

		if (!ptr) {

			dma_release_from_contiguous(dev, page, count);

			return NULL;

		}

	} else {

		__dma_remap(page, size, prot);

		ptr = page_address(page);

	}

	*ret_page = page;

	return page_address(page);

	return ptr;

}



static void __free_from_contiguous(struct device *dev, struct page *page,

				   size_t size)

				   void *cpu_addr, size_t size)

{

	if (PageHighMem(page))

		__dma_free_remap(cpu_addr, size);

	else

		__dma_remap(page, size, pgprot_kernel);

	dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT);

}
@@ -583,9 +610,9 @@ static inline pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot) 
#define __get_dma_pgprot(attrs, prot)	__pgprot(0)

#define __alloc_remap_buffer(dev, size, gfp, prot, ret, c)	NULL

#define __alloc_from_pool(size, ret_page)			NULL

#define __alloc_from_contiguous(dev, size, prot, ret)		NULL

#define __alloc_from_contiguous(dev, size, prot, ret, c)	NULL

#define __free_from_pool(cpu_addr, size)			0

#define __free_from_contiguous(dev, page, size)			do { } while (0)

#define __free_from_contiguous(dev, page, cpu_addr, size)	do { } while (0)

#define __dma_free_remap(cpu_addr, size)			do { } while (0)



#endif	/* CONFIG_MMU */
@@ -645,7 +672,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, 
	else if (!IS_ENABLED(CONFIG_CMA))

		addr = __alloc_remap_buffer(dev, size, gfp, prot, &page, caller);

	else

		addr = __alloc_from_contiguous(dev, size, prot, &page);

		addr = __alloc_from_contiguous(dev, size, prot, &page, caller);



	if (addr)

		*handle = pfn_to_dma(dev, page_to_pfn(page));
@@ -739,7 +766,7 @@ static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr, 
		 * Non-atomic allocations cannot be freed with IRQs disabled

		 */

		WARN_ON(irqs_disabled());

		__free_from_contiguous(dev, page, size);

		__free_from_contiguous(dev, page, cpu_addr, size);

	}

}

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