+/**
+ * udb_address - return the BAR2 User Doorbell address for a Queue
+ * @adap: the adapter
+ * @cntxt_id: the Queue Context ID
+ * @qpp: Queues Per Page (for all PFs)
+ *
+ * Returns the BAR2 address of the user Doorbell associated with the
+ * indicated Queue Context ID. Note that this is only applicable
+ * for T5 and later.
+ */
+static u64 udb_address(struct adapter *adap, unsigned int cntxt_id,
+ unsigned int qpp)
+{
+ u64 udb;
+ unsigned int s_qpp;
+ unsigned short udb_density;
+ unsigned long qpshift;
+ int page;
+
+ BUG_ON(is_t4(adap->params.chip));
+
+ s_qpp = (QUEUESPERPAGEPF0 +
+ (QUEUESPERPAGEPF1 - QUEUESPERPAGEPF0) * adap->fn);
+ udb_density = 1 << ((qpp >> s_qpp) & QUEUESPERPAGEPF0_MASK);
+ qpshift = PAGE_SHIFT - ilog2(udb_density);
+ udb = cntxt_id << qpshift;
+ udb &= PAGE_MASK;
+ page = udb / PAGE_SIZE;
+ udb += (cntxt_id - (page * udb_density)) * SGE_UDB_SIZE;
+
+ return udb;
+}
+
+static u64 udb_address_eq(struct adapter *adap, unsigned int cntxt_id)
+{
+ return udb_address(adap, cntxt_id,
+ t4_read_reg(adap, SGE_EGRESS_QUEUES_PER_PAGE_PF));
+}
+
+static u64 udb_address_iq(struct adapter *adap, unsigned int cntxt_id)
+{
+ return udb_address(adap, cntxt_id,
+ t4_read_reg(adap, SGE_INGRESS_QUEUES_PER_PAGE_PF));
+}
+