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authorLinus Torvalds <torvalds@linux-foundation.org>2010-12-18 10:13:24 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-12-18 10:13:24 -0800
commit46bdfe6a50b88942f5323f837a3afd93a1c86e60 (patch)
tree9fe5add84d9bcca4670b1af98940d7267c3a3571 /arch
parentc15524a40a1603dc56a8691c4f50172fb86c23d8 (diff)
parenta2c606d53ab71dee6410f10ef0adf67321d60e06 (diff)
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
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/e820.h3
-rw-r--r--arch/x86/kernel/Makefile1
-rw-r--r--arch/x86/kernel/resource.c48
-rw-r--r--arch/x86/kernel/setup.c1
-rw-r--r--arch/x86/pci/i386.c18
5 files changed, 57 insertions, 14 deletions
diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h
index 5be1542fbfa..e99d55d74df 100644
--- a/arch/x86/include/asm/e820.h
+++ b/arch/x86/include/asm/e820.h
@@ -72,6 +72,9 @@ struct e820map {
#define BIOS_BEGIN 0x000a0000
#define BIOS_END 0x00100000
+#define BIOS_ROM_BASE 0xffe00000
+#define BIOS_ROM_END 0xffffffff
+
#ifdef __KERNEL__
/* see comment in arch/x86/kernel/e820.c */
extern struct e820map e820;
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 9e13763b609..1e994754d32 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 00000000000..2a26819bb6a
--- /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 21c6746338a..85268f8eadf 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();
diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index c4bb261c106..b1805b78842 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -65,21 +65,13 @@ pcibios_align_resource(void *data, const struct resource *res,
resource_size_t size, resource_size_t align)
{
struct pci_dev *dev = data;
- resource_size_t start = round_down(res->end - size + 1, align);
+ resource_size_t start = res->start;
if (res->flags & IORESOURCE_IO) {
-
- /*
- * If we're avoiding ISA aliases, the largest contiguous I/O
- * port space is 256 bytes. Clearing bits 9 and 10 preserves
- * all 256-byte and smaller alignments, so the result will
- * still be correctly aligned.
- */
- if (!skip_isa_ioresource_align(dev))
- start &= ~0x300;
- } else if (res->flags & IORESOURCE_MEM) {
- if (start < BIOS_END)
- start = res->end; /* fail; no space */
+ if (skip_isa_ioresource_align(dev))
+ return start;
+ if (start & 0x300)
+ start = (start + 0x3ff) & ~0x3ff;
}
return start;
}