From: Jon Mason <jdmason@us.ibm.com>
Date: Mon, 26 Jun 2006 11:56:37 +0000 (+0200)
Subject: [PATCH] x86_64: trivial gart clean-up
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7c2d9cd218916276e52a5dae827b84a159fe5c96;p=linux-beck.git

[PATCH] x86_64: trivial gart clean-up

A trivial change to have gart_unmap_sg call gart_unmap_single directly,
instead of bouncing through the dma_unmap_single wrapper in
dma-mapping.h.

This change required moving the gart_unmap_single above gart_unmap_sg,
and under gart_map_single (which seems a more logical place that its
current location IMHO).

Signed-off-by: Jon Mason <jdmason@us.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index e0198da7451d..ea8f4041794e 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -288,6 +288,28 @@ dma_addr_t gart_map_single(struct device *dev, void *addr, size_t size, int dir)
 	return bus; 
 }
 
+/*
+ * Free a DMA mapping.
+ */
+void gart_unmap_single(struct device *dev, dma_addr_t dma_addr,
+		      size_t size, int direction)
+{
+	unsigned long iommu_page;
+	int npages;
+	int i;
+
+	if (dma_addr < iommu_bus_base + EMERGENCY_PAGES*PAGE_SIZE ||
+	    dma_addr >= iommu_bus_base + iommu_size)
+		return;
+	iommu_page = (dma_addr - iommu_bus_base)>>PAGE_SHIFT;
+	npages = to_pages(dma_addr, size);
+	for (i = 0; i < npages; i++) {
+		iommu_gatt_base[iommu_page + i] = gart_unmapped_entry;
+		CLEAR_LEAK(iommu_page + i);
+	}
+	free_iommu(iommu_page, npages);
+}
+
 /*
  * Wrapper for pci_unmap_single working with scatterlists.
  */
@@ -299,7 +321,7 @@ void gart_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, int di
 		struct scatterlist *s = &sg[i];
 		if (!s->dma_length || !s->length)
 			break;
-		dma_unmap_single(dev, s->dma_address, s->dma_length, dir);
+		gart_unmap_single(dev, s->dma_address, s->dma_length, dir);
 	}
 }
 
@@ -458,28 +480,6 @@ error:
 	return 0;
 } 
 
-/*
- * Free a DMA mapping.
- */ 
-void gart_unmap_single(struct device *dev, dma_addr_t dma_addr,
-		      size_t size, int direction)
-{
-	unsigned long iommu_page; 
-	int npages;
-	int i;
-
-	if (dma_addr < iommu_bus_base + EMERGENCY_PAGES*PAGE_SIZE || 
-	    dma_addr >= iommu_bus_base + iommu_size)
-		return;
-	iommu_page = (dma_addr - iommu_bus_base)>>PAGE_SHIFT;	
-	npages = to_pages(dma_addr, size);
-	for (i = 0; i < npages; i++) { 
-		iommu_gatt_base[iommu_page + i] = gart_unmapped_entry; 
-		CLEAR_LEAK(iommu_page + i);
-	}
-	free_iommu(iommu_page, npages);
-}
-
 static int no_agp;
 
 static __init unsigned long check_iommu_size(unsigned long aper, u64 aper_size)