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intel-iommu: Use symbolic values instead of magic numbers in Lenovo w/a

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Commit 9eecabcb9a ("intel-iommu: Abort 
IOMMU setup for igfx if BIOS gave no shadow GTT space") uses a bunch of 
magic numbers. Provide #defines for those to make it look slightly saner.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Adam Jackson 2010-08-25 21:17:34 +01:00 committed by David Woodhouse
parent 9eecabcb9a
commit eecfd57f64
1 changed files with 12 additions and 2 deletions
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14
drivers/pci/intel-iommu.c
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@ -3761,14 +3761,24 @@ static void __devinit quirk_iommu_rwbf(struct pci_dev *dev)
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf);
#define GGC 0x52
#define GGC_MEMORY_SIZE_MASK (0xf << 8)
#define GGC_MEMORY_SIZE_NONE (0x0 << 8)
#define GGC_MEMORY_SIZE_1M (0x1 << 8)
#define GGC_MEMORY_SIZE_2M (0x3 << 8)
#define GGC_MEMORY_VT_ENABLED (0x8 << 8)
#define GGC_MEMORY_SIZE_2M_VT (0x9 << 8)
#define GGC_MEMORY_SIZE_3M_VT (0xa << 8)
#define GGC_MEMORY_SIZE_4M_VT (0xb << 8)
static void __devinit quirk_calpella_no_shadow_gtt(struct pci_dev *dev)
{
unsigned short ggc;
if (pci_read_config_word(dev, 0x52, &ggc))
if (pci_read_config_word(dev, GGC, &ggc))
return;
if (!(ggc & 0x800)) {
if (!(ggc & GGC_MEMORY_VT_ENABLED)) {
printk(KERN_INFO "DMAR: BIOS has allocated no shadow GTT; disabling IOMMU for graphics\n");
dmar_map_gfx = 0;
}