Report information about transaction processing hints and latency
tolerance reporting capabilities, if present.
---
lib/header.h | 20 ++++++++++++++
ls-ecaps.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 104 insertions(+), 0 deletions(-)
diff --git a/lib/header.h b/lib/header.h
index 5d285c2..d481f27 100644
--- a/lib/header.h
+++ b/lib/header.h
@@ -223,6 +223,8 @@
#define PCI_EXT_CAP_ID_ARI 0x0e /* Alternative Routing-ID Interpretation */
#define PCI_EXT_CAP_ID_ATS 0x0f /* Address Translation Service */
#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 */
/*** Definitions of capabilities ***/
@@ -1028,6 +1030,24 @@
#define PCI_IOV_MSA_BIR(x) ((x) & 7) /* VF Migration State BIR */
#define PCI_IOV_MSA_OFFSET(x) ((x) & 0xfffffff8) /* VF Migration State Offset */
+/* Transaction Processing Hints */
+#define PCI_TPH_CAPABILITIES 4
+#define PCI_TPH_INTVEC_SUP (1<<1) /* Supports interrupt vector mode */
+#define PCI_TPH_DEV_SUP (1<<2) /* Device specific mode supported */
+#define PCI_TPH_EXT_REQ_SUP (1<<8) /* Supports extended requests */
+#define PCI_TPH_ST_LOC_MASK (3<<9) /* Steering table location bits */
+#define PCI_TPH_ST_NONE (0<<9) /* No steering table */
+#define PCI_TPH_ST_CAP (1<<9) /* Steering table in TPH cap */
+#define PCI_TPH_ST_MSIX (2<<9) /* Steering table in MSI-X table */
+#define PCI_TPH_ST_SIZE_SHIFT (16) /* Encoded as size - 1 */
+
+/* Latency Tolerance Reporting */
+#define PCI_LTR_MAX_SNOOP 4 /* 16 bit value */
+#define PCI_LTR_VALUE_MASK (0x3ff)
+#define PCI_LTR_SCALE_SHIFT (10)
+#define PCI_LTR_SCALE_MASK (7)
+#define PCI_LTR_MAX_NOSNOOP 6 /* 16 bit value */
+
/*
* The PCI interface treats multi-function devices as independent
* devices. The slot/function address of each device is encoded
diff --git a/ls-ecaps.c b/ls-ecaps.c
index ed10f72..6e58fb0 100644
--- a/ls-ecaps.c
+++ b/ls-ecaps.c
@@ -12,6 +12,84 @@
#include "lspci.h"
static void
+cap_tph(struct device *d, int where)
+{
+ u32 tph_cap;
+ printf("Transaction Processing Hints\n");
+ if (verbose < 2)
+ return;
+
+ if (!config_fetch(d, where + PCI_TPH_CAPABILITIES, 4))
+ return;
+
+ tph_cap = get_conf_long(d, where + PCI_TPH_CAPABILITIES);
+
+ if (tph_cap & PCI_TPH_INTVEC_SUP)
+ printf("\t\tInterrupt vector mode supported\n");
+ if (tph_cap & PCI_TPH_DEV_SUP)
+ printf("\t\tDevice specific mode supported\n");
+ if (tph_cap & PCI_TPH_EXT_REQ_SUP)
+ printf("\t\tExtended requester support\n");
+
+ switch (tph_cap & PCI_TPH_ST_LOC_MASK) {
+ case PCI_TPH_ST_NONE:
+ printf("\t\tNo steering table available\n");
+ break;
+ case PCI_TPH_ST_CAP:
+ printf("\t\tSteering table in TPH capability structure\n");
+ break;
+ case PCI_TPH_ST_MSIX:
+ printf("\t\tSteering table in MSI-X table\n");
+ break;
+ default:
+ printf("\t\tReserved steering table location\n");
+ break;
+ }
+}
+
+static u32
+cap_ltr_scale(u8 scale)
+{
+ return 1 << (scale * 5);
+}
+
+static void
+cap_ltr(struct device *d, int where)
+{
+ u32 scale;
+ u16 snoop, nosnoop;
+ printf("Latency Tolerance Reporting\n");
+ if (verbose < 2)
+ return;
+
+ if (!config_fetch(d, where + PCI_LTR_MAX_SNOOP, 4))
+ return;
+
+ snoop = get_conf_word(d, where + PCI_LTR_MAX_SNOOP);
+ scale = cap_ltr_scale((snoop >> PCI_LTR_SCALE_SHIFT) & PCI_LTR_SCALE_MASK);
+ printf("\t\tMax snoop latency: %lldns\n",
+ ((unsigned long long)snoop & PCI_LTR_VALUE_MASK) * scale);
+
+ nosnoop = get_conf_word(d, where + PCI_LTR_MAX_NOSNOOP);
+ scale = cap_ltr_scale((nosnoop >> PCI_LTR_SCALE_SHIFT) & PCI_LTR_SCALE_MASK);
+ printf("\t\tMax no snoop latency: %lldns\n",
+ ((unsigned long long)nosnoop & PCI_LTR_VALUE_MASK) * scale);
+}
+
+static void
cap_dsn(struct device *d, int where)
{
u32 t1, t2;
@@ -455,6 +533,12 @@ show_ext_caps(struct device *d)
case PCI_EXT_CAP_ID_SRIOV:
cap_sriov(d, where);
break;
+ case PCI_EXT_CAP_ID_TPH:
+ cap_tph(d, where);
+ break;
+ case PCI_EXT_CAP_ID_LTR:
+ cap_ltr(d, where);
+ break;
default:
printf("#%02x\n", id);
break;
--
1.7.1
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