[PATCH] revert x86_64-use-the-e820-hole-to-map-the-iommu-agp-aperture

Martin Bligh determined that this patch is causing his test box to not boot.
Revert.

Andi Kleen <ak@muc.de>

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 11 insertions, 30 deletions

diff --git a/arch/x86_64/kernel/aperture.c b/arch/x86_64/kernel/aperture.c
index a491f72cc966..504e63474993 100644
--- a/arch/x86_64/kernel/aperture.c
+++ b/arch/x86_64/kernel/aperture.c
@@ -33,12 +33,10 @@ int fallback_aper_force __initdata = 0;
 
 int fix_aperture __initdata = 1;
 
-#define NB_ID_3 (PCI_VENDOR_ID_AMD | (0x1103<<16))
+/* This code runs before the PCI subsystem is initialized, so just
+   access the northbridge directly. */
 
-static struct resource aper_res = {
-        .name = "Aperture",
-        .flags = IORESOURCE_MEM,
-};
+#define NB_ID_3 (PCI_VENDOR_ID_AMD | (0x1103<<16))
 
 static u32 __init allocate_aperture(void) 
 {
@@ -55,24 +53,11 @@ static u32 __init allocate_aperture(void)
         aper_size = (32 * 1024 * 1024) << fallback_aper_order; 
 
         /* 
-         * Aperture has to be naturally aligned. This means an 2GB
-         * aperture won't have much chances to find a place in the
-         * lower 4GB of memory.  Unfortunately we cannot move it up
-         * because that would make the IOMMU useless.
+         * Aperture has to be naturally aligned. This means an 2GB aperture won't
+         * have much chances to find a place in the lower 4GB of memory.
+         * Unfortunately we cannot move it up because that would make the
+         * IOMMU useless.
          */
-
-        /* First try to find some free unused space */
-        if (!allocate_resource(&iomem_resource, &aper_res,
-                               aper_size,
-                               0, 0xffffffff,
-                               aper_size,
-                               NULL, NULL)) {
-                printk(KERN_INFO "Putting aperture at %lx-%lx\n",
-                       aper_res.start, aper_res.end);
-                return aper_res.start;
-        }
-
-        /* No free space found. Go on to waste some memory... */
         p = __alloc_bootmem_node(nd0, aper_size, aper_size, 0); 
         if (!p || __pa(p)+aper_size > 0xffffffff) {
                 printk("Cannot allocate aperture memory hole (%p,%uK)\n",
@@ -81,7 +66,7 @@ static u32 __init allocate_aperture(void)
                         free_bootmem_node(nd0, (unsigned long)p, aper_size); 
                 return 0;
         }
-        printk("Mapping aperture over %d KB of precious RAM @ %lx\n",
+        printk("Mapping aperture over %d KB of RAM @ %lx\n",
                aper_size >> 10, __pa(p)); 
         return (u32)__pa(p); 
 }
@@ -102,16 +87,10 @@ static int __init aperture_valid(char *name, u64 aper_base, u32 aper_size)
                 printk("Aperture from %s pointing to e820 RAM. Ignoring.\n",name);
                 return 0; 
         } 
-        /* Don't check the resource here because the aperture is usually
-           in an e820 reserved area, and we allocated these earlier. */
         return 1;
 } 
 
-/*
- * Find a PCI capability.
- * This code runs before the PCI subsystem is initialized, so just
- * access the northbridge directly.
- */
+/* Find a PCI capability */
 static __u32 __init find_cap(int num, int slot, int func, int cap) 
 { 
         u8 pos;
@@ -276,6 +255,8 @@ void __init iommu_hole_init(void)
                    fallback_aper_force) { 
                 printk("Your BIOS doesn't leave a aperture memory hole\n");
                 printk("Please enable the IOMMU option in the BIOS setup\n");
+                printk("This costs you %d MB of RAM\n",
+                       32 << fallback_aper_order);
 
                 aper_order = fallback_aper_order;
                 aper_alloc = allocate_aperture();