lspci: Decode Precision Time Measurement capabiltity

Section 7.32 Precision Time Management (or Measurement) from the
PCI Express Base 3.1 specification is an optional Extended Capability
for discovering and controlling the distribution of a PTM Hierarchy.

Signed-off-by: Yong, Jonathan <jonathan.yong@intel.com>

diff --git a/lib/header.h b/lib/header.h
index b8f7dc14c58fe0005dadbfc86d253bca97d9576e..8463641cbdab0ff3929f64d0bccdb0602ee88065 100644 (file)
--- a/lib/header.h
+++ b/lib/header.h
@@ -230,6 +230,7 @@
 #define PCI_EXT_CAP_ID_LTR     0x18    /* Latency Tolerance Reporting */
 #define PCI_EXT_CAP_ID_PASID   0x1b    /* Process Address Space ID */
 #define PCI_EXT_CAP_ID_L1PM    0x1e    /* L1 PM Substates */
+#define PCI_EXT_CAP_ID_PTM     0x1f    /* Precision Time Measurement */
 
 /*** Definitions of capabilities ***/
 

diff --git a/ls-ecaps.c b/ls-ecaps.c
index 82984356537280e055f3051206c5a7d6738939e0..0273240f51fe65939c5812067b79248710e8fcb7 100644 (file)
--- a/ls-ecaps.c
+++ b/ls-ecaps.c
@@ -548,6 +548,65 @@ cap_l1pm(struct device *d, int where)
     }
 }
 
+static void
+cap_ptm(struct device *d, int where)
+{
+  u32 buff;
+  u16 clock;
+
+  printf("Precision Time Measurement\n");
+
+  if (verbose < 2)
+    return;
+
+  if (!config_fetch(d, where + 4, 8))
+    {
+      printf("\t\t<unreadable>\n");
+      return;
+    }
+
+  buff = get_conf_long(d, where + 4);
+  printf("\t\tPTMCap: ");
+  printf("Requester:%c Responder:%c Root:%c\n",
+    FLAG(buff, 0x1),
+    FLAG(buff, 0x2),
+    FLAG(buff, 0x4));
+
+  clock = BITS(buff, 8, 8);
+  printf("\t\tPTMClockGranularity: ");
+  switch (clock)
+    {
+      case 0x00:
+        printf("Unimplemented\n");
+        break;
+      case 0xff:
+        printf("Greater than 254ns\n");
+        break;
+      default:
+        printf("%huns\n", clock);
+    }
+
+  buff = get_conf_long(d, where + 8);
+  printf("\t\tPTMControl: ");
+  printf("Enabled:%c RootSelected:%c\n",
+    FLAG(buff, 0x1),
+    FLAG(buff, 0x2));
+
+  clock = BITS(buff, 8, 8);
+  printf("\t\tPTMEffectiveGranularity: ");
+  switch (clock)
+    {
+      case 0x00:
+        printf("Unknown\n");
+        break;
+      case 0xff:
+        printf("Greater than 254ns\n");
+        break;
+      default:
+        printf("%huns\n", clock);
+    }
+}
+
 void
 show_ext_caps(struct device *d)
 {
@@ -635,6 +694,9 @@ show_ext_caps(struct device *d)
          case PCI_EXT_CAP_ID_L1PM:
            cap_l1pm(d, where);
            break;
+         case PCI_EXT_CAP_ID_PTM:
+           cap_ptm(d, where);
+           break;
          default:
            printf("#%02x\n", id);
            break;