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x86, AMD IOMMU: add functions for mapping/unmapping the MMIO space

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This patch contains two functions to map and unmap the MMIO region of an IOMMU.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: Sebastian.Biemueller@amd.com
Cc: robert.richter@amd.com
Cc: joro@8bytes.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Joerg Roedel 2008-06-26 21:27:43 +02:00 committed by Ingo Molnar
parent ca7ed057ae
commit 6c56747b46
1 changed files with 23 additions and 0 deletions
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23
arch/x86/kernel/amd_iommu_init.c
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@ -117,6 +117,29 @@ static u32 dev_table_size;
static u32 alias_table_size;
static u32 rlookup_table_size;
static u8 * __init iommu_map_mmio_space(u64 address)
{
u8 *ret;
if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu"))
return NULL;
ret = ioremap_nocache(address, MMIO_REGION_LENGTH);
if (ret != NULL)
return ret;
release_mem_region(address, MMIO_REGION_LENGTH);
return NULL;
}
static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu)
{
if (iommu->mmio_base)
iounmap(iommu->mmio_base);
release_mem_region(iommu->mmio_phys, MMIO_REGION_LENGTH);
}
static int __init find_last_devid_on_pci(int bus, int dev, int fn, int cap_ptr)
{
u32 cap;