pciutils: Add decode support for Data Object Exchange Extended Capability

PCI Data Object Exchange [1] provides a mailbox interface used as the
transport for various protocols defined by PCI-SIG and others. Make the
limited information in config space available. Note the Read/Write
Mailbox registers themselves are not currently parsed as the usefulness
of accessing one dword of a protocol is probably limited.

In future, operating systems may provide means to safely query the
supported protocols, but those have not yet been defined.

Example output:

	Capabilities: [100 v1] Data Object Exchange
		DOECap: IntSup+
			Interrupt Message Number 001
		DOECtl: IntEn+
		DOESta: Busy- IntSta- Error- ObjectReady+

[1] PCIe r6.0, sections 6.30 and 7.9.24

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

3 files changed, 355 insertions, 0 deletions

diff --git a/lib/header.h b/lib/header.h
index ec1bb63..a069040 100644
--- a/lib/header.h
+++ b/lib/header.h
@@ -252,6 +252,7 @@
 #define PCI_EXT_CAP_ID_LMR	0x27	/* Lane Margining at Receiver */
 #define PCI_EXT_CAP_ID_HIER_ID	0x28	/* Hierarchy ID */
 #define PCI_EXT_CAP_ID_NPEM	0x29	/* Native PCIe Enclosure Management */
+#define PCI_EXT_CAP_ID_DOE	0x2e	/* Data Object Exchange */
 
 /*** Definitions of capabilities ***/
 
@@ -1255,6 +1256,20 @@
 #define  PCI_L1PM_SUBSTAT_CTL1_ASPM_L11	0x8	/* ASPM L1.1 Enable */
 #define PCI_L1PM_SUBSTAT_CTL2	0xC	/* L1 PM Substate Control 2 */
 
+/* Data Object Exchange Extended Capability */
+#define PCI_DOE_CAP		0x4	/* DOE Capabilities Register */
+#define  PCI_DOE_CAP_INT_SUPP		0x1	/* Interrupt Support */
+#define  PCI_DOE_CAP_INT_MSG(x) (((x) >> 1) & 0x7ff) /* DOE Interrupt Message Number */
+#define PCI_DOE_CTL		0x8	/* DOE Control Register */
+#define  PCI_DOE_CTL_ABORT		0x1	/* DOE Abort */
+#define  PCI_DOE_CTL_INT		0x2	/* DOE Interrupt Enable */
+#define  PCI_DOE_CTL_GO			0x80000000 /* DOE Go */
+#define PCI_DOE_STS		0xC	/* DOE Status Register */
+#define  PCI_DOE_STS_BUSY		0x1	/* DOE Busy */
+#define  PCI_DOE_STS_INT		0x2	/* DOE Interrupt Status */
+#define  PCI_DOE_STS_ERROR		0x3	/* DOE Error */
+#define  PCI_DOE_STS_OBJECT_READY	0x80000000 /* Data Object Ready */
+
 /*
  * 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 2c0264e..15c57a8 100644
--- a/ls-ecaps.c
+++ b/ls-ecaps.c
@@ -992,6 +992,41 @@ cap_rebar(struct device *d, int where, int virtual)
     }
 }
 
+static void
+cap_doe(struct device *d, int where)
+{
+  u32 l;
+
+  printf("Data Object Exchange\n");
+
+  if (verbose < 2)
+    return;
+
+  if (!config_fetch(d, where + PCI_DOE_CAP, 0x14))
+    {
+      printf("\t\t<unreadable>\n");
+      return;
+    }
+
+  l = get_conf_long(d, where + PCI_DOE_CAP);
+  printf("\t\tDOECap: IntSup%c\n",
+	 FLAG(l, PCI_DOE_CAP_INT_SUPP));
+  if (l & PCI_DOE_CAP_INT_SUPP)
+    printf("\t\t\tInterrupt Message Number %03x\n",
+	   PCI_DOE_CAP_INT_MSG(l));
+
+  l = get_conf_long(d, where + PCI_DOE_CTL);
+  printf("\t\tDOECtl: IntEn%c\n",
+	 FLAG(l, PCI_DOE_CTL_INT));
+
+  l = get_conf_long(d, where + PCI_DOE_STS);
+  printf("\t\tDOESta: Busy%c IntSta%c Error%c ObjectReady%c\n",
+	 FLAG(l, PCI_DOE_STS_BUSY),
+	 FLAG(l, PCI_DOE_STS_INT),
+	 FLAG(l, PCI_DOE_STS_ERROR),
+	 FLAG(l, PCI_DOE_STS_OBJECT_READY));
+}
+
 void
 show_ext_caps(struct device *d, int type)
 {
@@ -1139,6 +1174,9 @@ show_ext_caps(struct device *d, int type)
 	  case PCI_EXT_CAP_ID_NPEM:
 	    printf("Native PCIe Enclosure Management <?>\n");
 	    break;
+	  case PCI_EXT_CAP_ID_DOE:
+	    cap_doe(d, where);
+	    break;
 	  default:
 	    printf("Extended Capability ID %#02x\n", id);
 	    break;
diff --git a/tests/cap-doe b/tests/cap-doe
new file mode 100644
index 0000000..562f1cb
--- /dev/null
+++ b/tests/cap-doe
@@ -0,0 +1,302 @@
+df:00.0 Class 0502: Device 8086:0d93 (rev 01) (prog-if 10)
+	Subsystem: Device 1af4:1100
+	Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
+	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
+	Interrupt: pin ? routed to IRQ 255
+	Region 0: Memory at 10800000 (64-bit, non-prefetchable) [disabled]
+	Region 2: Memory at 10810000 (64-bit, non-prefetchable) [disabled]
+	Region 4: Memory at 10811000 (32-bit, non-prefetchable) [disabled]
+	Capabilities: [40] MSI-X: Enable- Count=2 Masked-
+		Vector table: BAR=4 offset=00000000
+		PBA: BAR=4 offset=00000800
+	Capabilities: [80] Express (v2) Endpoint, MSI 00
+		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
+			ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 0W
+		DevCtl:	CorrErr- NonFatalErr- FatalErr- UnsupReq-
+			RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
+			MaxPayload 128 bytes, MaxReadReq 128 bytes
+		DevSta:	CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
+		LnkCap:	Port #0, Speed 2.5GT/s, Width x1, ASPM L0s, Exit Latency L0s <64ns
+			ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
+		LnkCtl:	ASPM Disabled; RCB 64 bytes, Disabled- CommClk-
+			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
+		LnkSta:	Speed 2.5GT/s (ok), Width x1 (ok)
+			TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
+		DevCap2: Completion Timeout: Not Supported, TimeoutDis- NROPrPrP- LTR-
+			 10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt+ EETLPPrefix+, MaxEETLPPrefixes 4
+			 EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
+			 FRS- TPHComp- ExtTPHComp-
+		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR- 10BitTagReq- OBFF Disabled,
+			 AtomicOpsCtl: ReqEn-
+		LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
+			 Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
+			 Compliance Preset/De-emphasis: -6dB de-emphasis, 0dB preshoot
+		LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1-
+			 EqualizationPhase2- EqualizationPhase3- LinkEqualizationRequest-
+			 Retimer- 2Retimers- CrosslinkRes: unsupported
+	Capabilities: [100 v1] Data Object Exchange
+		DOECap: IntSup+
+			Interrupt Message Number 001
+		DOECtl: IntEn+
+		DOESta: Busy- IntSta- Error- ObjectReady+
+	Capabilities: [130 v1] Data Object Exchange
+		DOECap: IntSup-
+		DOECtl: IntEn-
+		DOESta: Busy- IntSta- Error- ObjectReady-
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