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>

3 files changed, 83 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/hfi1/debugfs.c b/drivers/infiniband/hw/hfi1/debugfs.c
index 5e9be16f6cd3..632ba21759ab 100644
--- a/drivers/infiniband/hw/hfi1/debugfs.c
+++ b/drivers/infiniband/hw/hfi1/debugfs.c
@@ -933,6 +933,43 @@ static const struct counter_info port_cntr_ops[] = {
         DEBUGFS_OPS("asic_flags", asic_flags_read, asic_flags_write),
 };
 
+static void *_sdma_cpu_list_seq_start(struct seq_file *s, loff_t *pos)
+{
+        if (*pos >= num_online_cpus())
+                return NULL;
+
+        return pos;
+}
+
+static void *_sdma_cpu_list_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+        ++*pos;
+        if (*pos >= num_online_cpus())
+                return NULL;
+
+        return pos;
+}
+
+static void _sdma_cpu_list_seq_stop(struct seq_file *s, void *v)
+{
+        /* nothing allocated */
+}
+
+static int _sdma_cpu_list_seq_show(struct seq_file *s, void *v)
+{
+        struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private;
+        struct hfi1_devdata *dd = dd_from_dev(ibd);
+        loff_t *spos = v;
+        loff_t i = *spos;
+
+        sdma_seqfile_dump_cpu_list(s, dd, (unsigned long)i);
+        return 0;
+}
+
+DEBUGFS_SEQ_FILE_OPS(sdma_cpu_list);
+DEBUGFS_SEQ_FILE_OPEN(sdma_cpu_list)
+DEBUGFS_FILE_OPS(sdma_cpu_list);
+
 void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd)
 {
         char name[sizeof("port0counters") + 1];
@@ -961,6 +998,7 @@ void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd)
         DEBUGFS_SEQ_FILE_CREATE(ctx_stats, ibd->hfi1_ibdev_dbg, ibd);
         DEBUGFS_SEQ_FILE_CREATE(qp_stats, ibd->hfi1_ibdev_dbg, ibd);
         DEBUGFS_SEQ_FILE_CREATE(sdes, ibd->hfi1_ibdev_dbg, ibd);
+        DEBUGFS_SEQ_FILE_CREATE(sdma_cpu_list, ibd->hfi1_ibdev_dbg, ibd);
         /* dev counter files */
         for (i = 0; i < ARRAY_SIZE(cntr_ops); i++)
                 DEBUGFS_FILE_CREATE(cntr_ops[i].name,
diff --git a/drivers/infiniband/hw/hfi1/sdma.c b/drivers/infiniband/hw/hfi1/sdma.c
index 8cfa960a1a4a..fd39bcaa062d 100644
--- a/drivers/infiniband/hw/hfi1/sdma.c
+++ b/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
  */
diff --git a/drivers/infiniband/hw/hfi1/sdma.h b/drivers/infiniband/hw/hfi1/sdma.h
index 93025f6ded15..56257ea3598f 100644
--- a/drivers/infiniband/hw/hfi1/sdma.h
+++ b/drivers/infiniband/hw/hfi1/sdma.h
@@ -1068,6 +1068,8 @@ ssize_t sdma_set_cpu_to_sde_map(struct sdma_engine *sde, const char *buf,
                                 size_t count);
 int sdma_engine_get_vl(struct sdma_engine *sde);
 void sdma_seqfile_dump_sde(struct seq_file *s, struct sdma_engine *);
+void sdma_seqfile_dump_cpu_list(struct seq_file *s, struct hfi1_devdata *dd,
+                                unsigned long cpuid);
 
 #ifdef CONFIG_SDMA_VERBOSITY
 void sdma_dumpstate(struct sdma_engine *);