[v4 1/4] ARM: dma-mapping: atomic_pool with struct page **pages
From: Hiroshi Doyu <hidden>
Date: 2012-08-28 05:14:24
Also in:
linux-arm-kernel, linux-mm, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
struct page **pages is necessary to align with non atomic path in __iommu_get_pages(). atomic_pool() has the intialized **pages instead of just *page. Signed-off-by: Hiroshi Doyu <redacted> --- arch/arm/mm/dma-mapping.c | 17 ++++++++++++++--- 1 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 1123808..51d5e2b 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c@@ -296,7 +296,7 @@ struct dma_pool { unsigned long *bitmap; unsigned long nr_pages; void *vaddr; - struct page *page; + struct page **pages; }; static struct dma_pool atomic_pool = {
@@ -335,6 +335,7 @@ static int __init atomic_pool_init(void) unsigned long nr_pages = pool->size >> PAGE_SHIFT; unsigned long *bitmap; struct page *page; + struct page **pages; void *ptr; int bitmap_size = BITS_TO_LONGS(nr_pages) * sizeof(long);
@@ -342,21 +343,31 @@ static int __init atomic_pool_init(void) if (!bitmap) goto no_bitmap; + pages = kzalloc(nr_pages * sizeof(struct page *), GFP_KERNEL); + if (!pages) + goto no_pages; + if (IS_ENABLED(CONFIG_CMA)) ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page); else ptr = __alloc_remap_buffer(NULL, pool->size, GFP_KERNEL, prot, &page, NULL); if (ptr) { + int i; + + for (i = 0; i < nr_pages; i++) + pages[i] = page + i; + spin_lock_init(&pool->lock); pool->vaddr = ptr; - pool->page = page; + pool->pages = pages; pool->bitmap = bitmap; pool->nr_pages = nr_pages; pr_info("DMA: preallocated %u KiB pool for atomic coherent allocations\n", (unsigned)pool->size / 1024); return 0; } +no_pages: kfree(bitmap); no_bitmap: pr_err("DMA: failed to allocate %u KiB pool for atomic coherent allocation\n",
@@ -481,7 +492,7 @@ static void *__alloc_from_pool(size_t size, struct page **ret_page) if (pageno < pool->nr_pages) { bitmap_set(pool->bitmap, pageno, count); ptr = pool->vaddr + PAGE_SIZE * pageno; - *ret_page = pool->page + pageno; + *ret_page = pool->pages[pageno]; } else { pr_err_once("ERROR: %u KiB atomic DMA coherent pool is too small!\n" "Please increase it with coherent_pool= kernel parameter!\n",
--
1.7.5.4
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