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Intel IOMMU: Iommu Gfx workaround

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When we fix all the opensource gfx drivers to use the DMA api's, at that time
we can yank this config options out.

[[email protected]: Kconfig fixes]
Signed-off-by: Anil S Keshavamurthy <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Muli Ben-Yehuda <[email protected]>
Cc: "Siddha, Suresh B" <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Ashok Raj <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Greg KH <[email protected]>
Signed-off-by: Jan Engelhardt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Keshavamurthy, Anil S 2007-10-21 16:41:55 -07:00 • committed by Linus Torvalds
commit e820482cd2
5 changed files with 79 additions and 4 deletions
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33
drivers/pci/intel-iommu.c
View file

@ -1602,6 +1602,36 @@ static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr,
rmrr->end_address + 1);
}
#ifdef CONFIG_DMAR_GFX_WA
extern int arch_get_ram_range(int slot, u64 *addr, u64 *size);
static void __init iommu_prepare_gfx_mapping(void)
{
struct pci_dev *pdev = NULL;
u64 base, size;
int slot;
int ret;
for_each_pci_dev(pdev) {
if (pdev->sysdata == DUMMY_DEVICE_DOMAIN_INFO ||
!IS_GFX_DEVICE(pdev))
continue;
printk(KERN_INFO "IOMMU: gfx device %s 1-1 mapping\n",
pci_name(pdev));
slot = arch_get_ram_range(0, &base, &size);
while (slot >= 0) {
ret = iommu_prepare_identity_map(pdev,
base, base + size);
if (ret)
goto error;
slot = arch_get_ram_range(slot, &base, &size);
}
continue;
error:
printk(KERN_ERR "IOMMU: mapping reserved region failed\n");
}
}
#endif
int __init init_dmars(void)
{
struct dmar_drhd_unit *drhd;
@ -1665,6 +1695,8 @@ int __init init_dmars(void)
}
}
iommu_prepare_gfx_mapping();
/*
* for each drhd
* enable fault log
@ -2176,3 +2208,4 @@ int __init intel_iommu_init(void)
dma_ops = &intel_dma_ops;
return 0;
}

7
drivers/pci/intel-iommu.h
View file

@ -315,4 +315,11 @@ struct intel_iommu {
struct sys_device sysdev;
};
#ifndef CONFIG_DMAR_GFX_WA
static inline void iommu_prepare_gfx_mapping(void)
{
return;
}
#endif /* !CONFIG_DMAR_GFX_WA */
#endif