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: 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>

1 files changed, 23 insertions, 0 deletions

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index ee0b2da027bc..3147e6991005 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -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;