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Subject[PATCH 08/34] AMD IOMMU: add functions for programming IOMMU MMIO space
Date
This patch adds the functions required to programm the IOMMU with the MMIO
space.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu_init.c | 60 ++++++++++++++++++++++++++++++++++++++
1 files changed, 60 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 3147e69..ffb8ac8 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -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;
--
1.5.3.7



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