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x86, AMD IOMMU: add functions for programming IOMMU MMIO space 

This patch adds the functions required to programm the IOMMU with the MMIO
space.

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 21:27:44 +02:00 committed by Ingo Molnar
parent 6c56747b46
commit b2026aa2dc
1 changed files with 60 additions and 0 deletions
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60
arch/x86/kernel/amd_iommu_init.c
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@ -117,6 +117,66 @@ static u32 dev_table_size;
static u32 alias_table_size;
static u32 rlookup_table_size;
static void __init iommu_set_exclusion_range(struct amd_iommu *iommu)
{
u64 start = iommu->exclusion_start & PAGE_MASK;
u64 limit = (start + iommu->exclusion_length) & PAGE_MASK;
u64 entry;
if (!iommu->exclusion_start)
return;
entry = start | MMIO_EXCL_ENABLE_MASK;
memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET,
&entry, sizeof(entry));
entry = limit;
memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET,
&entry, sizeof(entry));
}
static void __init iommu_set_device_table(struct amd_iommu *iommu)
{
u32 entry;
BUG_ON(iommu->mmio_base == NULL);
entry = virt_to_phys(amd_iommu_dev_table);
entry |= (dev_table_size >> 12) - 1;
memcpy_toio(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET,
&entry, sizeof(entry));
}
static void __init iommu_feature_enable(struct amd_iommu *iommu, u8 bit)
{
u32 ctrl;
ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
ctrl |= (1 << bit);
writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
}
static void __init iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
{
u32 ctrl;
ctrl = (u64)readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
ctrl &= ~(1 << bit);
writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
}
void __init iommu_enable(struct amd_iommu *iommu)
{
u32 ctrl;
printk(KERN_INFO "AMD IOMMU: Enabling IOMMU at ");
print_devid(iommu->devid, 0);
printk(" cap 0x%hx\n", iommu->cap_ptr);
iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
}
static u8 * __init iommu_map_mmio_space(u64 address)
{
u8 *ret;