x86: change early_gart_iommu_check() back to any_mapped

Kevin Winchester reported a GART related direct rendering failure against
linux-next-20080611, which shows up via these log entries:

 PCI: Using ACPI for IRQ routing
 PCI: Cannot allocate resource region 0 of device 0000:00:00.0
 agpgart: Detected AGP bridge 0
 agpgart: Aperture conflicts with PCI mapping.
 agpgart: Aperture from AGP @ e0000000 size 128 MB
 agpgart: Aperture conflicts with PCI mapping.
 agpgart: No usable aperture found.
 agpgart: Consider rebooting with iommu=memaper=2 to get a good aperture.

instead of the expected:

 PCI: Using ACPI for IRQ routing
 agpgart: Detected AGP bridge 0
 agpgart: Aperture from AGP @ e0000000 size 128 MB

Kevin bisected it down to this change in tip/x86/gart:
"x86: checking aperture size order".

agp check is using request_mem_region(), and could fail if e820 is reserved...

change it back to e820_any_mapped().

Reported-and-bisected-by: "Kevin Winchester" <kjwinchester@gmail.com>
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Tested-by: Kevin Winchester <kjwinchester@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index 3409abb..e819362 100644 (file)
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -324,8 +324,8 @@ void __init early_gart_iommu_check(void)
                fix = 1;
 
        if (gart_fix_e820 && !fix && aper_enabled) {
-               if (!e820_all_mapped(aper_base, aper_base + aper_size,
-                                   E820_RESERVED)) {
+               if (e820_any_mapped(aper_base, aper_base + aper_size,
+                                   E820_RAM)) {
                        /* reserve it, so we can reuse it in second kernel */
                        printk(KERN_INFO "update e820 for GART\n");
                        add_memory_region(aper_base, aper_size, E820_RESERVED);