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    Subject[PATCH 03/10] iommu/vt-d: Add domain-id functions
    Date
    Interfaces for when a new domain in the crashdump kernel needs some
    values from the panicked kernel's context entries.

    Signed-off-by: Bill Sumner <billsumnerlinux@gmail.com>
    ---
    drivers/iommu/intel-iommu.c | 62 +++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 62 insertions(+)

    diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
    index 5ce2850..c0bebd6 100644
    --- a/drivers/iommu/intel-iommu.c
    +++ b/drivers/iommu/intel-iommu.c
    @@ -381,6 +381,13 @@ struct domain_values_entry {
    2 == 1GiB, 3 == 512GiB, 4 == 1TiB */
    };

    +static struct domain_values_entry *intel_iommu_did_to_domain_values_entry(
    + int did, struct intel_iommu *iommu);
    +
    +static int intel_iommu_get_dids_from_old_kernel(struct intel_iommu *iommu);
    +
    +static int device_to_domain_id(struct intel_iommu *iommu, u8 bus, u8 devfn);
    +
    #endif /* CONFIG_CRASH_DUMP */

    /*
    @@ -4832,3 +4839,58 @@ static void __init check_tylersburg_isoch(void)
    printk(KERN_WARNING "DMAR: Recommended TLB entries for ISOCH unit is 16; your BIOS set %d\n",
    vtisochctrl);
    }
    +
    +#ifdef CONFIG_CRASH_DUMP
    +
    +/*
    + * Interfaces for when a new domain in the crashdump kernel needs some
    + * values from the panicked kernel's context entries
    + *
    + */
    +static struct domain_values_entry *intel_iommu_did_to_domain_values_entry(
    + int did, struct intel_iommu *iommu)
    +{
    + struct domain_values_entry *dve; /* iterator */
    +
    + list_for_each_entry(dve, &domain_values_list[iommu->seq_id], link)
    + if (dve->did == did)
    + return dve;
    + return NULL;
    +}
    +
    +/* Mark domain-id's from old kernel as in-use on this iommu so that a new
    + * domain-id is allocated in the case where there is a device in the new kernel
    + * that was not in the old kernel -- and therefore a new domain-id is needed.
    + */
    +static int intel_iommu_get_dids_from_old_kernel(struct intel_iommu *iommu)
    +{
    + struct domain_values_entry *dve; /* iterator */
    +
    + pr_info("IOMMU:%d Domain ids from panicked kernel:\n", iommu->seq_id);
    +
    + list_for_each_entry(dve, &domain_values_list[iommu->seq_id], link) {
    + set_bit(dve->did, iommu->domain_ids);
    + pr_info("DID did:%d(0x%4.4x)\n", dve->did, dve->did);
    + }
    +
    + pr_info("----------------------------------------\n");
    + return 0;
    +}
    +
    +static int device_to_domain_id(struct intel_iommu *iommu, u8 bus, u8 devfn)
    +{
    + int did = -1; /* domain-id returned */
    + struct root_entry *root;
    + struct context_entry *context;
    + unsigned long flags;
    +
    + spin_lock_irqsave(&iommu->lock, flags);
    + root = &iommu->root_entry[bus];
    + context = get_context_addr_from_root(root);
    + if (context && context_present(context+devfn))
    + did = context_domain_id(context+devfn);
    + spin_unlock_irqrestore(&iommu->lock, flags);
    + return did;
    +}
    +
    +#endif /* CONFIG_CRASH_DUMP */
    --
    2.0.0-rc0


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