X-Git-Url: https://repo.jachan.dev/linux.git/blobdiff_plain/6924d1ab8b7bbe5ab416713f5701b3316b2df85b..acee709cab689ec7703770e8b8cb5cc3a4abcb31:/arch/x86/kernel/pci-gart_64.c

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 021f3c684a62..be60961f8695 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -32,6 +32,7 @@
 #include <asm/mtrr.h>
 #include <asm/pgtable.h>
 #include <asm/proto.h>
+#include <asm/iommu.h>
 #include <asm/gart.h>
 #include <asm/cacheflush.h>
 #include <asm/swiotlb.h>
@@ -630,6 +631,7 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
 	struct pci_dev *dev;
 	void *gatt;
 	int i, error;
+	unsigned long start_pfn, end_pfn;
 
 	printk(KERN_INFO "PCI-DMA: Disabling AGP.\n");
 	aper_size = aper_base = info->aper_size = 0;
@@ -674,6 +676,13 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
 
 	printk(KERN_INFO "PCI-DMA: aperture base @ %x size %u KB\n",
 	       aper_base, aper_size>>10);
+
+	/* need to map that range */
+	end_pfn = (aper_base>>PAGE_SHIFT) + (aper_size>>PAGE_SHIFT);
+	if (end_pfn > max_low_pfn_mapped) {
+		start_pfn = (aper_base>>PAGE_SHIFT);
+		init_memory_mapping(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT);
+	}
 	return 0;
 
  nommu:
@@ -751,10 +760,10 @@ void __init gart_iommu_init(void)
 		return;
 
 	if (no_iommu ||
-	    (!force_iommu && end_pfn <= MAX_DMA32_PFN) ||
+	    (!force_iommu && max_pfn <= MAX_DMA32_PFN) ||
 	    !gart_iommu_aperture ||
 	    (no_agp && init_k8_gatt(&info) < 0)) {
-		if (end_pfn > MAX_DMA32_PFN) {
+		if (max_pfn > MAX_DMA32_PFN) {
 			printk(KERN_WARNING "More than 4GB of memory "
 			       	          "but GART IOMMU not available.\n"
 			       KERN_WARNING "falling back to iommu=soft.\n");