IB/hfi1: Add new debugfs sdma_cpu_list file

Add a debugfs sdma_cpu_list file that can be used to examine the CPU to
sdma engine assignments for the whole device.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Reviewed-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Reviewed-by: Jianxin Xiong <jianxin.xiong@intel.com>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/hfi1/sdma.c

@@ -1093,6 +1093,49 @@ static void sdma_rht_free(void *ptr, void *arg)
 	kfree(rht_node);
 }
 
+/**
+ * sdma_seqfile_dump_cpu_list() - debugfs dump the cpu to sdma mappings
+ * @s: seq file
+ * @dd: hfi1_devdata
+ * @cpuid: cpu id
+ *
+ * This routine dumps the process to sde mappings per cpu
+ */
+void sdma_seqfile_dump_cpu_list(struct seq_file *s,
+				struct hfi1_devdata *dd,
+				unsigned long cpuid)
+{
+	struct sdma_rht_node *rht_node;
+	int i, j;
+
+	rht_node = rhashtable_lookup_fast(&dd->sdma_rht, &cpuid,
+					  sdma_rht_params);
+	if (!rht_node)
+		return;
+
+	seq_printf(s, "cpu%3lu: ", cpuid);
+	for (i = 0; i < HFI1_MAX_VLS_SUPPORTED; i++) {
+		if (!rht_node->map[i] || !rht_node->map[i]->ctr)
+			continue;
+
+		seq_printf(s, " vl%d: [", i);
+
+		for (j = 0; j < rht_node->map[i]->ctr; j++) {
+			if (!rht_node->map[i]->sde[j])
+				continue;
+
+			if (j > 0)
+				seq_puts(s, ",");
+
+			seq_printf(s, " sdma%2d",
+				   rht_node->map[i]->sde[j]->this_idx);
+		}
+		seq_puts(s, " ]");
+	}
+
+	seq_puts(s, "\n");
+}
+
 /*
  * Free the indicated map struct
  */