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    Subject[PATCH 20/34] AMD IOMMU: add functions to initialize unity mappings
    Date
    This patch adds the functions which will initialize the unity mappings in the
    device page tables.

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/kernel/amd_iommu.c | 122 +++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 122 insertions(+), 0 deletions(-)
    diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
    index a24ee4a..1d70f5e 100644
    --- a/arch/x86/kernel/amd_iommu.c
    +++ b/arch/x86/kernel/amd_iommu.c
    @@ -37,6 +37,9 @@ struct command {
    u32 data[4];
    };

    +static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
    + struct unity_map_entry *e);
    +
    static int __iommu_queue_command(struct amd_iommu *iommu, struct command *cmd)
    {
    u32 tail, head;
    @@ -144,3 +147,122 @@ static int iommu_flush_pages(struct amd_iommu *iommu, u16 domid,
    return 0;
    }

    +static int iommu_map(struct protection_domain *dom,
    + unsigned long bus_addr,
    + unsigned long phys_addr,
    + int prot)
    +{
    + u64 __pte, *pte, *page;
    +
    + bus_addr = PAGE_ALIGN(bus_addr);
    + phys_addr = PAGE_ALIGN(bus_addr);
    +
    + /* only support 512GB address spaces for now */
    + if (bus_addr > IOMMU_MAP_SIZE_L3 || !(prot & IOMMU_PROT_MASK))
    + return -EINVAL;
    +
    + pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(bus_addr)];
    +
    + if (!IOMMU_PTE_PRESENT(*pte)) {
    + page = (u64 *)get_zeroed_page(GFP_KERNEL);
    + if (!page)
    + return -ENOMEM;
    + *pte = IOMMU_L2_PDE(virt_to_phys(page));
    + }
    +
    + pte = IOMMU_PTE_PAGE(*pte);
    + pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];
    +
    + if (!IOMMU_PTE_PRESENT(*pte)) {
    + page = (u64 *)get_zeroed_page(GFP_KERNEL);
    + if (!page)
    + return -ENOMEM;
    + *pte = IOMMU_L1_PDE(virt_to_phys(page));
    + }
    +
    + pte = IOMMU_PTE_PAGE(*pte);
    + pte = &pte[IOMMU_PTE_L0_INDEX(bus_addr)];
    +
    + if (IOMMU_PTE_PRESENT(*pte))
    + return -EBUSY;
    +
    + __pte = phys_addr | IOMMU_PTE_P;
    + if (prot & IOMMU_PROT_IR)
    + __pte |= IOMMU_PTE_IR;
    + if (prot & IOMMU_PROT_IW)
    + __pte |= IOMMU_PTE_IW;
    +
    + *pte = __pte;
    +
    + return 0;
    +}
    +
    +static int iommu_for_unity_map(struct amd_iommu *iommu,
    + struct unity_map_entry *entry)
    +{
    + u16 bdf, i;
    +
    + for (i = entry->devid_start; i <= entry->devid_end; ++i) {
    + bdf = amd_iommu_alias_table[i];
    + if (amd_iommu_rlookup_table[bdf] == iommu)
    + return 1;
    + }
    +
    + return 0;
    +}
    +
    +static int iommu_init_unity_mappings(struct amd_iommu *iommu)
    +{
    + struct unity_map_entry *entry;
    + int ret;
    +
    + list_for_each_entry(entry, &amd_iommu_unity_map, list) {
    + if (!iommu_for_unity_map(iommu, entry))
    + continue;
    + ret = dma_ops_unity_map(iommu->default_dom, entry);
    + if (ret)
    + return ret;
    + }
    +
    + return 0;
    +}
    +
    +static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
    + struct unity_map_entry *e)
    +{
    + u64 addr;
    + int ret;
    +
    + for (addr = e->address_start; addr < e->address_end;
    + addr += PAGE_SIZE) {
    + ret = iommu_map(&dma_dom->domain, addr, addr, e->prot);
    + if (ret)
    + return ret;
    + /*
    + * if unity mapping is in aperture range mark the page
    + * as allocated in the aperture
    + */
    + if (addr < dma_dom->aperture_size)
    + __set_bit(addr >> PAGE_SHIFT, dma_dom->bitmap);
    + }
    +
    + return 0;
    +}
    +
    +static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom,
    + u16 devid)
    +{
    + struct unity_map_entry *e;
    + int ret;
    +
    + list_for_each_entry(e, &amd_iommu_unity_map, list) {
    + if (!(devid >= e->devid_start && devid <= e->devid_end))
    + continue;
    + ret = dma_ops_unity_map(dma_dom, e);
    + if (ret)
    + return ret;
    + }
    +
    + return 0;
    +}
    +
    --
    1.5.3.7



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