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@xxxxxxxxx>
---
lib/header.h | 1 +
ls-ecaps.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 63 insertions(+)
diff --git a/lib/header.h b/lib/header.h
index b8f7dc1..8463641 100644
--- 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 8298435..0273240 100644
--- 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;
--
2.7.3
--
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