Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6:
  x86: avoid high BIOS area when allocating address space
  x86: avoid E820 regions when allocating address space
  x86: avoid low BIOS area when allocating address space
  resources: add arch hook for preventing allocation in reserved areas
  Revert "resources: support allocating space within a region from the top down"
  Revert "PCI: allocate bus resources from the top down"
  Revert "x86/PCI: allocate space from the end of a region, not the beginning"
  Revert "x86: allocate space within a region top-down"
  Revert "PCI: fix pci_bus_alloc_resource() hang, prefer positive decode"
  PCI: Update MCP55 quirk to not affect non HyperTransport variants

3 files changed, 49 insertions, 1 deletions

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 9e13763b6092..1e994754d323 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -45,6 +45,7 @@ obj-y			+= pci-dma.o quirks.o i8237.o topology.o kdebugfs.o
 obj-y                   += alternative.o i8253.o pci-nommu.o hw_breakpoint.o
 obj-y                   += tsc.o io_delay.o rtc.o
 obj-y                   += pci-iommu_table.o
+obj-y                   += resource.o
 
 obj-$(CONFIG_X86_TRAMPOLINE)    += trampoline.o
 obj-y                           += process.o
diff --git a/arch/x86/kernel/resource.c b/arch/x86/kernel/resource.c
new file mode 100644
index 000000000000..2a26819bb6a8
--- /dev/null
+++ b/arch/x86/kernel/resource.c
@@ -0,0 +1,48 @@
+#include <linux/ioport.h>
+#include <asm/e820.h>
+
+static void resource_clip(struct resource *res, resource_size_t start,
+                          resource_size_t end)
+{
+        resource_size_t low = 0, high = 0;
+
+        if (res->end < start || res->start > end)
+                return;         /* no conflict */
+
+        if (res->start < start)
+                low = start - res->start;
+
+        if (res->end > end)
+                high = res->end - end;
+
+        /* Keep the area above or below the conflict, whichever is larger */
+        if (low > high)
+                res->end = start - 1;
+        else
+                res->start = end + 1;
+}
+
+static void remove_e820_regions(struct resource *avail)
+{
+        int i;
+        struct e820entry *entry;
+
+        for (i = 0; i < e820.nr_map; i++) {
+                entry = &e820.map[i];
+
+                resource_clip(avail, entry->addr,
+                              entry->addr + entry->size - 1);
+        }
+}
+
+void arch_remove_reservations(struct resource *avail)
+{
+        /* Trim out BIOS areas (low 1MB and high 2MB) and E820 regions */
+        if (avail->flags & IORESOURCE_MEM) {
+                if (avail->start < BIOS_END)
+                        avail->start = BIOS_END;
+                resource_clip(avail, BIOS_ROM_BASE, BIOS_ROM_END);
+
+                remove_e820_regions(avail);
+        }
+}
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 21c6746338af..85268f8eadf6 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -769,7 +769,6 @@ void __init setup_arch(char **cmdline_p)
 
         x86_init.oem.arch_setup();
 
-        resource_alloc_from_bottom = 0;
         iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
         setup_memory_map();
         parse_setup_data();