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    Subject[PATCH 14/27] iommu/amd: Allocate data structures to keep track of irq remapping tables
    Date
    To easily map device ids to interrupt remapping table
    entries a new lookup table is necessary.

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    drivers/iommu/amd_iommu_init.c | 16 ++++++++++++++++
    drivers/iommu/amd_iommu_types.h | 9 +++++++++
    2 files changed, 25 insertions(+)

    diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
    index 49e72b9..473a51d 100644
    --- a/drivers/iommu/amd_iommu_init.c
    +++ b/drivers/iommu/amd_iommu_init.c
    @@ -181,6 +181,12 @@ u16 *amd_iommu_alias_table;
    struct amd_iommu **amd_iommu_rlookup_table;

    /*
    + * This table is used to find the irq remapping table for a given device id
    + * quickly.
    + */
    +struct irq_remap_table **irq_lookup_table;
    +
    +/*
    * AMD IOMMU allows up to 2^16 differend protection domains. This is a bitmap
    * to know which ones are already in use.
    */
    @@ -1532,9 +1538,13 @@ static struct syscore_ops amd_iommu_syscore_ops = {

    static void __init free_on_init_error(void)
    {
    + free_pages((unsigned long)irq_lookup_table,
    + get_order(rlookup_table_size));
    +
    if (amd_iommu_irq_cache) {
    kmem_cache_destroy(amd_iommu_irq_cache);
    amd_iommu_irq_cache = NULL;
    +
    }

    amd_iommu_uninit_devices();
    @@ -1687,6 +1697,12 @@ static int __init early_amd_iommu_init(void)
    0, NULL);
    if (!amd_iommu_irq_cache)
    goto out;
    +
    + irq_lookup_table = (void *)__get_free_pages(
    + GFP_KERNEL | __GFP_ZERO,
    + get_order(rlookup_table_size));
    + if (!irq_lookup_table)
    + goto out;
    }

    ret = init_memory_definitions(ivrs_base);
    diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
    index 0e15e78..ceaa499 100644
    --- a/drivers/iommu/amd_iommu_types.h
    +++ b/drivers/iommu/amd_iommu_types.h
    @@ -175,6 +175,7 @@
    #define DEV_ENTRY_EX 0x67
    #define DEV_ENTRY_SYSMGT1 0x68
    #define DEV_ENTRY_SYSMGT2 0x69
    +#define DEV_ENTRY_IRQ_TBL_EN 0x80
    #define DEV_ENTRY_INIT_PASS 0xb8
    #define DEV_ENTRY_EINT_PASS 0xb9
    #define DEV_ENTRY_NMI_PASS 0xba
    @@ -337,6 +338,14 @@ extern bool amd_iommu_iotlb_sup;
    #define MAX_IRQS_PER_TABLE 256
    #define IRQ_TABLE_ALIGNMENT 128

    +struct irq_remap_table {
    + spinlock_t lock;
    + unsigned min_index;
    + u32 *table;
    +};
    +
    +extern struct irq_remap_table **irq_lookup_table;
    +
    /* Interrupt remapping feature used? */
    extern bool amd_iommu_irq_remap;

    --
    1.7.9.5



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