x86: Gart: fix breakage due to IOMMU initialization cleanup
This fixes the following breakage of the commit
75f1cdf1dd
:
- 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>
This commit is contained in:
parent
f4780ca005
commit
f3eee54276
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@ -280,7 +280,8 @@ void __init early_gart_iommu_check(void)
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* or BIOS forget to put that in reserved.
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* try to update e820 to make that region as reserved.
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*/
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int i, fix, slot;
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u32 agp_aper_base = 0, agp_aper_order = 0;
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int i, fix, slot, valid_agp = 0;
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u32 ctl;
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u32 aper_size = 0, aper_order = 0, last_aper_order = 0;
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u64 aper_base = 0, last_aper_base = 0;
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@ -290,6 +291,8 @@ void __init early_gart_iommu_check(void)
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return;
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/* This is mostly duplicate of iommu_hole_init */
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agp_aper_base = search_agp_bridge(&agp_aper_order, &valid_agp);
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fix = 0;
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for (i = 0; i < ARRAY_SIZE(bus_dev_ranges); i++) {
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int bus;
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@ -342,10 +345,10 @@ void __init early_gart_iommu_check(void)
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}
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}
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if (!fix)
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if (valid_agp)
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return;
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/* different nodes have different setting, disable them all at first*/
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/* disable them all at first */
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for (i = 0; i < ARRAY_SIZE(bus_dev_ranges); i++) {
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int bus;
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int dev_base, dev_limit;
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@ -458,8 +461,6 @@ out:
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if (aper_alloc) {
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/* Got the aperture from the AGP bridge */
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} else if (!valid_agp) {
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/* Do nothing */
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} else if ((!no_iommu && max_pfn > MAX_DMA32_PFN) ||
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force_iommu ||
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valid_agp ||
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@ -710,7 +710,8 @@ static void gart_iommu_shutdown(void)
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struct pci_dev *dev;
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int i;
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if (no_agp)
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/* don't shutdown it if there is AGP installed */
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if (!no_agp)
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return;
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for (i = 0; i < num_k8_northbridges; i++) {
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