linux-kernel - [PATCH 2/8] x86: add free_coherent dma

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Date:	Tue, 19 Aug 2008 16:32:40 +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 2/8] x86: add free_coherent dma_ops callback to GART driver

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/pci-gart_64.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 44a75a6..794d026 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -526,6 +526,15 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
 	return NULL;
 }
 
+/* free a coherent mapping */
+static void
+gart_free_coherent(struct device *dev, size_t size, void *vaddr,
+		   dma_addr_t dma_addr)
+{
+	gart_unmap_single(dev, dma_addr, size, DMA_BIDIRECTIONAL);
+	free_pages((unsigned long)vaddr, get_order(size));
+}
+
 static int no_agp;
 
 static __init unsigned long check_iommu_size(unsigned long aper, u64 aper_size)
@@ -729,6 +738,7 @@ static struct dma_mapping_ops gart_dma_ops = {
 	.map_sg				= gart_map_sg,
 	.unmap_sg			= gart_unmap_sg,
 	.alloc_coherent			= gart_alloc_coherent,
+	.free_coherent			= gart_free_coherent,
 };
 
 void gart_iommu_shutdown(void)
-- 
1.5.3.7


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