linux-kernel - [PATCH 1/8] x86: add alloc_coherent dma

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Date:	Tue, 19 Aug 2008 16:32:39 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	mingo@...hat.com, tglx@...utronix.de, hpa@...or.com
CC:	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	muli@...ibm.com, Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 1/8] x86: add alloc_coherent dma_ops callback to GART driver

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/pci-gart_64.c |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 4d8efb0..44a75a6 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -506,6 +506,26 @@ error:
 	return 0;
 }
 
+/* allocate and map a coherent mapping */
+static void *
+gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
+		    gfp_t flag)
+{
+	void *vaddr;
+
+	vaddr = (void *)__get_free_pages(flag, get_order(size));
+	if (!vaddr)
+		return NULL;
+
+	*dma_addr = gart_map_single(dev, __pa(vaddr), size, DMA_BIDIRECTIONAL);
+	if (*dma_addr != bad_dma_address)
+		return vaddr;
+
+	free_pages((unsigned long)vaddr, get_order(size));
+
+	return NULL;
+}
+
 static int no_agp;
 
 static __init unsigned long check_iommu_size(unsigned long aper, u64 aper_size)
@@ -708,6 +728,7 @@ static struct dma_mapping_ops gart_dma_ops = {
 	.sync_sg_for_device		= NULL,
 	.map_sg				= gart_map_sg,
 	.unmap_sg			= gart_unmap_sg,
+	.alloc_coherent			= gart_alloc_coherent,
 };
 
 void gart_iommu_shutdown(void)
-- 
1.5.3.7


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