linux-kernel - [v4 3/4] ARM: dma-mapping: Introduce __atomic_get_pages() for __iommu_get

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Message-ID: <1346130784-23571-4-git-send-email-hdoyu@nvidia.com>
Date:	Tue, 28 Aug 2012 08:13:03 +0300
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	<m.szyprowski@...sung.com>
CC:	Hiroshi Doyu <hdoyu@...dia.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linaro-mm-sig@...ts.linaro.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <kyungmin.park@...sung.com>,
	<arnd@...db.de>, <linux@....linux.org.uk>,
	<chunsang.jeong@...aro.org>, <vdumpa@...dia.com>,
	<subashrp@...il.com>, <minchan@...nel.org>,
	<pullip.cho@...sung.com>, <konrad.wilk@...cle.com>,
	<linux-tegra@...r.kernel.org>
Subject: [v4 3/4] ARM: dma-mapping: Introduce __atomic_get_pages() for __iommu_get_pages()

Support atomic allocation in __iommu_get_pages().

Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>
---
 arch/arm/mm/dma-mapping.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index a62f552..4ef2d7b 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -503,6 +503,15 @@ static void *__alloc_from_pool(size_t size, struct page **ret_page)
 	return ptr;
 }
 
+static struct page **__atomic_get_pages(void *addr)
+{
+	struct dma_pool *pool = &atomic_pool;
+	struct page **pages = pool->pages;
+	int offs = (addr - pool->vaddr) >> PAGE_SHIFT;
+
+	return pages + offs;
+}
+
 static bool __in_atomic_pool(void *start, size_t size)
 {
 	struct dma_pool *pool = &atomic_pool;
@@ -1288,6 +1297,9 @@ static struct page **__iommu_get_pages(void *cpu_addr, struct dma_attrs *attrs)
 {
 	struct vm_struct *area;
 
+	if (__in_atomic_pool(cpu_addr, PAGE_SIZE))
+		return __atomic_get_pages(cpu_addr);
+
 	if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs))
 		return cpu_addr;
 
-- 
1.7.5.4

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