ALSA: seq: Print UMP Endpoint and Block information in proc outputs

This patch enhances the /proc/asound/seq/clients output to show a few
more information about the assigned UMP Endpoint and Blocks.

The "Groups" are shown in 1-based group number to align with the
sequencer client name and port number.
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230523075358.9672-36-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/seq/seq_clientmgr.c

@@ -2120,6 +2120,33 @@ static void terminate_ump_info_strings(void *p, int type)
 	}
 }
 
+#ifdef CONFIG_SND_PROC_FS
+static void dump_ump_info(struct snd_info_buffer *buffer,
+			  struct snd_seq_client *client)
+{
+	struct snd_ump_endpoint_info *ep;
+	struct snd_ump_block_info *bp;
+	int i;
+
+	if (!client->ump_info)
+		return;
+	ep = client->ump_info[SNDRV_SEQ_CLIENT_UMP_INFO_ENDPOINT];
+	if (ep && *ep->name)
+		snd_iprintf(buffer, "  UMP Endpoint: \"%s\"\n", ep->name);
+	for (i = 0; i < SNDRV_UMP_MAX_BLOCKS; i++) {
+		bp = client->ump_info[i + 1];
+		if (bp && *bp->name) {
+			snd_iprintf(buffer, "  UMP Block %d: \"%s\" [%s]\n",
+				    i, bp->name,
+				    bp->active ? "Active" : "Inactive");
+			snd_iprintf(buffer, "    Groups: %d-%d\n",
+				    bp->first_group + 1,
+				    bp->first_group + bp->num_groups);
+		}
+	}
+}
+#endif
+
 /* UMP-specific ioctls -- called directly without data copy */
 static int snd_seq_ioctl_client_ump_info(struct snd_seq_client *caller,
 					 unsigned int cmd,
@@ -2654,6 +2681,9 @@ void snd_seq_info_clients_read(struct snd_info_entry *entry,
 			    c, client->name,
 			    client->type == USER_CLIENT ? "User" : "Kernel",
 			    midi_version_string(client->midi_version));
+#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
+		dump_ump_info(buffer, client);
+#endif
 		snd_seq_info_dump_ports(buffer, client);
 		if (snd_seq_write_pool_allocated(client)) {
 			snd_iprintf(buffer, "  Output pool :\n");