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Subject[PATCH 7/8] Add domain-id functions to intel-iommu-kdump.c
Date

intel_iommu_did_to_domain_values_entry()
intel_iommu_get_dids_from_old_kernel()


Signed-off-by: Bill Sumner <bill.sumner@hp.com>
---
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@hp.com>


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