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Commit 6c56747b authored by Joerg Roedel's avatar Joerg Roedel Committed by Ingo Molnar
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x86, AMD IOMMU: add functions for mapping/unmapping the MMIO space 



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

Signed-off-by: default avatarJoerg 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: default avatarIngo Molnar <mingo@elte.hu>
parent ca7ed057

arch/x86/kernel/amd_iommu_init.c

+23 −0
Original line number Diff line number Diff line
@@ -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;