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authorYinghai Lu <yinghai@kernel.org>2009-12-14 11:52:15 +0900
committerIngo Molnar <mingo@elte.hu>2009-12-14 08:57:40 +0100
commitf3eee54276dfd1117fd94259f2b4a38388264724 (patch)
treeb51cb4d1dc14be52d6b91f59a6e27800e0c8a9cb /arch
parentf4780ca005404166cc40af77ef0e86132ab98a81 (diff)
downloadlinux-f3eee54276dfd1117fd94259f2b4a38388264724.tar.bz2
x86: Gart: fix breakage due to IOMMU initialization cleanup
This fixes the following breakage of the commit 75f1cdf1dda92cae037ec848ae63690d91913eac: - GART systems that don't AGP with broken BIOS and more than 4GB memory are forced to use swiotlb. They can allocate aperture by hand and use GART. - GART systems without GAP must disable GART on shutdown. - swiotlb usage is forced by the boot option, gart_iommu_hole_init() is not called, so we disable GART early_gart_iommu_check(). Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> LKML-Reference: <1260759135-6450-3-git-send-email-fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/aperture_64.c11
-rw-r--r--arch/x86/kernel/pci-gart_64.c3
2 files changed, 8 insertions, 6 deletions
diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index e0dfb6856aa2..3704997e8b25 100644
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -280,7 +280,8 @@ void __init early_gart_iommu_check(void)
* or BIOS forget to put that in reserved.
* try to update e820 to make that region as reserved.
*/
- int i, fix, slot;
+ u32 agp_aper_base = 0, agp_aper_order = 0;
+ int i, fix, slot, valid_agp = 0;
u32 ctl;
u32 aper_size = 0, aper_order = 0, last_aper_order = 0;
u64 aper_base = 0, last_aper_base = 0;
@@ -290,6 +291,8 @@ void __init early_gart_iommu_check(void)
return;
/* This is mostly duplicate of iommu_hole_init */
+ agp_aper_base = search_agp_bridge(&agp_aper_order, &valid_agp);
+
fix = 0;
for (i = 0; i < ARRAY_SIZE(bus_dev_ranges); i++) {
int bus;
@@ -342,10 +345,10 @@ void __init early_gart_iommu_check(void)
}
}
- if (!fix)
+ if (valid_agp)
return;
- /* different nodes have different setting, disable them all at first*/
+ /* disable them all at first */
for (i = 0; i < ARRAY_SIZE(bus_dev_ranges); i++) {
int bus;
int dev_base, dev_limit;
@@ -458,8 +461,6 @@ out:
if (aper_alloc) {
/* Got the aperture from the AGP bridge */
- } else if (!valid_agp) {
- /* Do nothing */
} else if ((!no_iommu && max_pfn > MAX_DMA32_PFN) ||
force_iommu ||
valid_agp ||
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index e6a0d402f171..56c0e730d3fe 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -710,7 +710,8 @@ static void gart_iommu_shutdown(void)
struct pci_dev *dev;
int i;
- if (no_agp)
+ /* don't shutdown it if there is AGP installed */
+ if (!no_agp)
return;
for (i = 0; i < num_k8_northbridges; i++) {