pciutils lspci: Add reporting of L1 PM Substate capability

L1 PM Substates is a new PCI power management feature that can enable lower power consumption when a PCIe Link is idle. This change to the PCI Base Specification is reflected in the PCI-SIG ECN titled "L1 PM Substates with CLKREQ".

---
 lib/header.h |  1 +
 ls-ecaps.c   | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 55 insertions(+)

index 69518fd..6608003 100644
@@ -226,6 +226,7 @@
 #define PCI_EXT_CAP_ID_SRIOV	0x10	/* Single Root I/O Virtualization */

#define PCI_EXT_CAP_ID_TPH 0x17 /* Transaction processing hints */ #define
PCI_EXT_CAP_ID_LTR 0x18 /* Latency Tolerance Reporting */
+#define PCI_EXT_CAP_ID_L1PM 0x1e /* L1 PM Substates */

/*** Definitions of capabilities ***/

index 161c275..7b28ce5 100644
@@ -448,6 +448,57 @@ cap_evendor(struct device *d, int where)
     BITS(hdr, 20, 12));
 }
 
+static void
+cap_l1pm(struct device *d, int where)
+{
+  u32 l1_cap;
+  int power_on_scale;
+
+  printf("L1 PM Substates\n");
+
+  if (verbose < 2)
+    return;
+
+  if (!config_fetch(d, where + 4, 4)) {
+      printf("\t\t<unreadable>\n");
+      return;
+  }
+
+  l1_cap = get_conf_long(d, where + 4);
+
+  printf("\t\tL1SubCap: ");
+  printf("PCI-PM_L1.2%c, PCI-PM_L1.1%c, ASPM_L1.2%c, ASPM_L1.1%c," +    "

L1_PM_Substates%c\n",

+    FLAG(l1_cap, 1),
+    FLAG(l1_cap, 2),
+    FLAG(l1_cap, 4),
+    FLAG(l1_cap, 8),
+    FLAG(l1_cap, 16));

+
+ if (BITS(l1_cap, 0, 1) || BITS(l1_cap, 2, 1)) {
+ printf("\t\t\t PortCommonModeRestoreTime=%dus, ",
+ BITS(l1_cap, 8,8));
+
+ power_on_scale = BITS(l1_cap, 16, 2);
+
+ printf("PortTPowerOnTime=");
+ switch (power_on_scale) {

+      case 0:
+      	printf("%dus\n", BITS(l1_cap, 19, 5) * 2);
+      	break;
+      case 1:
+      	printf("%dus\n", BITS(l1_cap, 19, 5) * 10);
+      	break;
+      case 2:
+      	printf("%dus\n", BITS(l1_cap, 19, 5) * 100);
+      	break;
+      default:
+      	printf("<error>\n");
+      	break;

+ }
+ }
+}
+
void
show_ext_caps(struct device *d)
{
@@ -526,6 +577,9 @@ show_ext_caps(struct device *d)
case PCI_EXT_CAP_ID_LTR:
cap_ltr(d, where);
break;
+ case PCI_EXT_CAP_ID_L1PM:
+ cap_l1pm(d, where);
+ break;
default:
printf("#%02x\n", id);
break;

1.8.0