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    Subject[PATCH 09/21] AMD IOMMU: add protection domain flags
    Date
    Imapct: add a new struct member to 'struct protection_domain'

    When using protection domains for dma_ops and KVM its better to know for
    which subsystem it was allocated. Add a flags member to struct
    protection domain for that purpose.

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/include/asm/amd_iommu_types.h | 14 +++++++++-----
    arch/x86/kernel/amd_iommu.c | 1 +
    2 files changed, 10 insertions(+), 5 deletions(-)

    diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
    index ac302a2..4862a5b 100644
    --- a/arch/x86/include/asm/amd_iommu_types.h
    +++ b/arch/x86/include/asm/amd_iommu_types.h
    @@ -190,16 +190,20 @@
    /* FIXME: move this macro to <linux/pci.h> */
    #define PCI_BUS(x) (((x) >> 8) & 0xff)

    +/* Protection domain flags */
    +#define PD_DMA_OPS_MASK (1UL << 0) /* domain used for dma_ops */
    +
    /*
    * This structure contains generic data for IOMMU protection domains
    * independent of their use.
    */
    struct protection_domain {
    - spinlock_t lock; /* mostly used to lock the page table*/
    - u16 id; /* the domain id written to the device table */
    - int mode; /* paging mode (0-6 levels) */
    - u64 *pt_root; /* page table root pointer */
    - void *priv; /* private data */
    + spinlock_t lock; /* mostly used to lock the page table*/
    + u16 id; /* the domain id written to the device table */
    + int mode; /* paging mode (0-6 levels) */
    + u64 *pt_root; /* page table root pointer */
    + unsigned long flags; /* flags to find out type of domain */
    + void *priv; /* private data */
    };

    /*
    diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
    index 7355da0..6d26544 100644
    --- a/arch/x86/kernel/amd_iommu.c
    +++ b/arch/x86/kernel/amd_iommu.c
    @@ -724,6 +724,7 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu,
    goto free_dma_dom;
    dma_dom->domain.mode = PAGE_MODE_3_LEVEL;
    dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
    + dma_dom->domain.flags = PD_DMA_OPS_MASK;
    dma_dom->domain.priv = dma_dom;
    if (!dma_dom->domain.pt_root)
    goto free_dma_dom;
    --
    1.5.6.4



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