[PATCH 7/8] iommu/vt-d: Add domain-id functions to intel-iommu-kdump.c

[Bill Sumner]

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 <bill.sumner@xxxxxx>
---
 drivers/iommu/intel-iommu-kdump.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/drivers/iommu/intel-iommu-kdump.c b/drivers/iommu/intel-iommu-kdump.c
index 4e653e048..f3c777e 100644
--- a/drivers/iommu/intel-iommu-kdump.c
+++ b/drivers/iommu/intel-iommu-kdump.c
@@ -53,6 +53,45 @@ static struct list_head *domain_values_list;
 
 
 /* ========================================================================
+ * Interfaces for when a new domain in the crashdump kernel needs some
+ * values from the panicked kernel's context entries
+ * ------------------------------------------------------------------------
+ */
+
+
+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.
+ */
+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;
+}
+
+
+/* ========================================================================
  * Copy iommu translation tables from old kernel into new  kernel.
  * Entry to this set of functions is: intel_iommu_copy_translation_tables()
  * ------------------------------------------------------------------------
-- 
Bill Sumner <bill.sumner@xxxxxx>

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