[Midnightbsd-cvs] src [8317] trunk/usr.sbin/pciconf/cap.c: print current and max link speed

[laffer1 at midnightbsd.org]

Revision: 8317
          http://svnweb.midnightbsd.org/src/?rev=8317
Author:   laffer1
Date:     2016-09-17 18:37:39 -0400 (Sat, 17 Sep 2016)
Log Message:
-----------
print current and max link speed

Modified Paths:
--------------
    trunk/usr.sbin/pciconf/cap.c

Modified: trunk/usr.sbin/pciconf/cap.c
===================================================================
--- trunk/usr.sbin/pciconf/cap.c	2016-09-17 22:35:21 UTC (rev 8316)
+++ trunk/usr.sbin/pciconf/cap.c	2016-09-17 22:37:39 UTC (rev 8317)
@@ -363,6 +363,22 @@
 
 #define	MAX_PAYLOAD(field)		(128 << (field))
 
+static const char *
+link_speed_string(uint8_t speed)
+{
+
+	switch (speed) {
+	case 1:
+		return ("2.5");
+	case 2:
+		return ("5.0");
+	case 3:
+		return ("8.0");
+	default:
+		return ("undef");
+	}
+}
+
 static void
 cap_express(int fd, struct pci_conf *p, uint8_t ptr)
 {
@@ -416,6 +432,16 @@
 	flags = read_config(fd, &p->pc_sel, ptr+ PCIER_LINK_STA, 2);
 	printf(" link x%d(x%d)", (flags & PCIEM_LINK_STA_WIDTH) >> 4,
 	    (val & PCIEM_LINK_CAP_MAX_WIDTH) >> 4);
+	/*
+	 * Only print link speed info if the link's max width is
+	 * greater than 0.
+	 */ 
+	if ((val & PCIEM_LINK_CAP_MAX_WIDTH) != 0) {
+		printf("\n                 speed");
+		printf(" %s(%s)", (flags & PCIEM_LINK_STA_WIDTH) == 0 ?
+		    "0.0" : link_speed_string(flags & PCIEM_LINK_STA_SPEED),
+	    	    link_speed_string(val & PCIEM_LINK_CAP_MAX_SPEED));
+	}
 }
 
 static void