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    Subject[PATCH 4/5] 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
    ---
    drivers/iommu/intel-iommu.c | 46 +++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 46 insertions(+)

    diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
    index 73afed4..bde8f22 100644
    --- a/drivers/iommu/intel-iommu.c
    +++ b/drivers/iommu/intel-iommu.c
    @@ -348,6 +348,7 @@ static inline int first_pte_in_page(struct dma_pte *pte)


    #ifdef CONFIG_CRASH_DUMP
    +
    /*
    * Fix Crashdump failure caused by leftover DMA through a hardware IOMMU
    *
    @@ -437,6 +438,16 @@ static int intel_iommu_copy_translation_tables(struct dmar_drhd_unit *drhd,
    struct root_entry **root_new_virt_p,
    int g_num_of_iommus);

    +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 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);
    +
    #endif /* CONFIG_CRASH_DUMP */

    /*
    @@ -5230,4 +5241,39 @@ static int intel_iommu_copy_translation_tables(struct dmar_drhd_unit *drhd,
    return 0;
    }

    +/*
    + * 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;
    +}
    +
    #endif /* CONFIG_CRASH_DUMP */
    --
    2.0.0-rc0


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