[PATCH] Insert GART region into resource map

Patch inserts the GART region into the iomem resource map. The GART will then
be visible within /proc/iomem. It will also allow for other users
utilizing the GART to subreserve the region (agp or IOMMU).

Signed-off-by: Aaron Durbin <adurbin@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 20 insertions, 1 deletions

diff --git a/arch/x86_64/kernel/aperture.c b/arch/x86_64/kernel/aperture.c
index 04dbf1662523..f851e1f9c82a 100644
--- a/arch/x86_64/kernel/aperture.c
+++ b/arch/x86_64/kernel/aperture.c
@@ -17,6 +17,7 @@
 #include <linux/pci_ids.h>
 #include <linux/pci.h>
 #include <linux/bitops.h>
+#include <linux/ioport.h>
 #include <asm/e820.h>
 #include <asm/io.h>
 #include <asm/proto.h>
@@ -33,6 +34,18 @@ int fallback_aper_force __initdata = 0;
 
 int fix_aperture __initdata = 1;
 
+static struct resource gart_resource = {
+        .name   = "GART",
+        .flags  = IORESOURCE_MEM,
+};
+
+static void __init insert_aperture_resource(u32 aper_base, u32 aper_size)
+{
+        gart_resource.start = aper_base;
+        gart_resource.end = aper_base + aper_size - 1;
+        insert_resource(&iomem_resource, &gart_resource);
+}
+
 /* This code runs before the PCI subsystem is initialized, so just
    access the northbridge directly. */
 
@@ -62,6 +75,7 @@ static u32 __init allocate_aperture(void)
         }
         printk("Mapping aperture over %d KB of RAM @ %lx\n",
                aper_size >> 10, __pa(p)); 
+        insert_aperture_resource((u32)__pa(p), aper_size);
         return (u32)__pa(p); 
 }
 
@@ -233,8 +247,13 @@ void __init iommu_hole_init(void)
                 last_aper_base = aper_base;
         } 
 
-        if (!fix && !fallback_aper_force) 
+        if (!fix && !fallback_aper_force) {
+                if (last_aper_base) {
+                        unsigned long n = (32 * 1024 * 1024) << last_aper_order;
+                        insert_aperture_resource((u32)last_aper_base, n);
+                }
                 return; 
+        }
 
         if (!fallback_aper_force)
                 aper_alloc = search_agp_bridge(&aper_order, &valid_agp);