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From: Sean V Kelley <sean.v.kelley@linux.intel.com>
To: mj@ucw.cz, bhelgaas@google.com
Cc: linux-pci@vger.kernel.org, Sean V Kelley <sean.v.kelley@linux.intel.com>
Subject: [PATCH v3] pciutils: Add decode support for RCECs
Date: Wed, 24 Jun 2020 15:39:40 -0700
Message-ID: <20200624223940.240463-1-sean.v.kelley@linux.intel.com> (raw)

Root Complex Event Collectors provide support for terminating error
and PME messages from RCiEPs.  This patch provides basic decoding for
the lspci RCEC Endpoint Association Extended Capability. See PCIe 5.0-1,
sec 7.9.10 for further details.

Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sean V Kelley <sean.v.kelley@linux.intel.com>
---
Changes since v2 [1]:

- Incorporated suggested improvement to RCiEP bitmap generation.
- Extended to support hyphenating adjacent devices in bitmap.
- Added verbose granularity on "none" cases for bitmap and BUSN reporting.
- Corrected use of "first" with "next" as found in the Spec.
- Reported "AssociatedBusNumbers" as a single hyphenated field.
- Regenerated test output with new formatting.
i.e.,

"-vvv" case
Capabilities: [160 v2] Root Complex Event Collector Endpoint Association
        RCiEPBitmap: 00000000 [none]
        AssociatedBusNumbers: ff-00 [none]

"-vv" case
Capabilities: [160 v2] Root Complex Event Collector Endpoint Association
        RCiEPBitmap: [none]
        AssociatedBusNumbers: [none]

(Bjorn Helgaas)

[1] https://lore.kernel.org/linux-pci/20200624040024.895996-1-sean.v.kelley@linux.intel.com/

Thanks,

Sean
---
 lib/header.h   |   8 +-
 ls-ecaps.c     |  59 +++++++++-
 setpci.c       |   2 +-
 tests/cap-rcec | 299 +++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 364 insertions(+), 4 deletions(-)
 create mode 100644 tests/cap-rcec

diff --git a/lib/header.h b/lib/header.h
index 472816e..57a9343 100644
--- a/lib/header.h
+++ b/lib/header.h
@@ -219,7 +219,7 @@
 #define PCI_EXT_CAP_ID_PB	0x04	/* Power Budgeting */
 #define PCI_EXT_CAP_ID_RCLINK	0x05	/* Root Complex Link Declaration */
 #define PCI_EXT_CAP_ID_RCILINK	0x06	/* Root Complex Internal Link Declaration */
-#define PCI_EXT_CAP_ID_RCECOLL	0x07	/* Root Complex Event Collector */
+#define PCI_EXT_CAP_ID_RCEC	0x07	/* Root Complex Event Collector */
 #define PCI_EXT_CAP_ID_MFVC	0x08	/* Multi-Function Virtual Channel */
 #define PCI_EXT_CAP_ID_VC2	0x09	/* Virtual Channel (2nd ID) */
 #define PCI_EXT_CAP_ID_RCRB	0x0a	/* Root Complex Register Block */
@@ -1048,6 +1048,12 @@
 #define  PCI_RCLINK_LINK_ADDR	8	/* Link Entry: Address (64-bit) */
 #define  PCI_RCLINK_LINK_SIZE	16	/* Link Entry: sizeof */

+/* Root Complex Event Collector Endpoint Association */
+#define  PCI_RCEC_EP_CAP_VER(reg)	(((reg) >> 16) & 0xf)
+#define  PCI_RCEC_BUSN_REG_VER	0x02	/* as per PCIe sec 7.9.10.1 */
+#define  PCI_RCEC_RCIEP_BMAP	0x0004	/* as per PCIe sec 7.9.10.2 */
+#define  PCI_RCEC_BUSN_REG	0x0008	/* as per PCIe sec 7.9.10.3 */
+
 /* PCIe Vendor-Specific Capability */
 #define PCI_EVNDR_HEADER	4	/* Vendor-Specific Header */
 #define PCI_EVNDR_REGISTERS	8	/* Vendor-Specific Registers */
diff --git a/ls-ecaps.c b/ls-ecaps.c
index e71209e..99c55ff 100644
--- a/ls-ecaps.c
+++ b/ls-ecaps.c
@@ -634,6 +634,61 @@ cap_rclink(struct device *d, int where)
     }
 }

+static void
+cap_rcec(struct device *d, int where)
+{
+  printf("Root Complex Event Collector Endpoint Association\n");
+  if (verbose < 2)
+    return;
+
+  if (!config_fetch(d, where, 12))
+    return;
+
+  u32 hdr = get_conf_long(d, where);
+  byte cap_ver = PCI_RCEC_EP_CAP_VER(hdr);
+  u32 bmap = get_conf_long(d, where + PCI_RCEC_RCIEP_BMAP);
+  printf("\t\tRCiEPBitmap: ");
+  if (bmap)
+    {
+      int prevmatched=0;
+      int adjcount=0;
+      int prevdev=0;
+      printf("RCiEP at Device(s):");
+      for (int dev=0; dev < 32; dev++)
+        {
+	  if (BITS(bmap, dev, 1))
+	    {
+	      if (!adjcount)
+	        printf("%s %u", (prevmatched) ? "," : "", dev);
+	      adjcount++;
+	      prevdev=dev;
+	      prevmatched=1;
+            }
+	  else
+	    {
+	      if (adjcount > 1)
+	        printf("-%u", prevdev);
+	      adjcount=0;
+            }
+        }
+   }
+  else
+    printf("%s", (verbose > 2) ? "00000000 [none]" : "[none]");
+  printf("\n");
+
+  if (cap_ver < PCI_RCEC_BUSN_REG_VER)
+    return;
+
+  u32 busn = get_conf_long(d, where + PCI_RCEC_BUSN_REG);
+  u8 lastbusn = BITS(busn, 16, 8);
+  u8 nextbusn = BITS(busn, 8, 8);
+
+  if ((lastbusn == 0x00) && (nextbusn == 0xff))
+    printf("\t\tAssociatedBusNumbers: %s\n", (verbose > 2) ? "ff-00 [none]" : "[none]");
+  else
+    printf("\t\tAssociatedBusNumbers: %02x-%02x\n", nextbusn, lastbusn );
+}
+
 static void
 cap_dvsec_cxl(struct device *d, int where)
 {
@@ -991,8 +1046,8 @@ show_ext_caps(struct device *d, int type)
 	  case PCI_EXT_CAP_ID_RCILINK:
 	    printf("Root Complex Internal Link <?>\n");
 	    break;
-	  case PCI_EXT_CAP_ID_RCECOLL:
-	    printf("Root Complex Event Collector <?>\n");
+	  case PCI_EXT_CAP_ID_RCEC:
+	    cap_rcec(d, where);
 	    break;
 	  case PCI_EXT_CAP_ID_MFVC:
 	    printf("Multi-Function Virtual Channel <?>\n");
diff --git a/setpci.c b/setpci.c
index 90ca726..2cb70fa 100644
--- a/setpci.c
+++ b/setpci.c
@@ -350,7 +350,7 @@ static const struct reg_name pci_reg_names[] = {
   { 0x20004,	0, 0, "ECAP_PB" },
   { 0x20005,	0, 0, "ECAP_RCLINK" },
   { 0x20006,	0, 0, "ECAP_RCILINK" },
-  { 0x20007,	0, 0, "ECAP_RCECOLL" },
+  { 0x20007,	0, 0, "ECAP_RCEC" },
   { 0x20008,	0, 0, "ECAP_MFVC" },
   { 0x20009,	0, 0, "ECAP_VC2" },
   { 0x2000a,	0, 0, "ECAP_RBCB" },
diff --git a/tests/cap-rcec b/tests/cap-rcec
new file mode 100644
index 0000000..836d9a1
--- /dev/null
+++ b/tests/cap-rcec
@@ -0,0 +1,299 @@
+6a:00.4 Generic system peripheral [0807]: Intel Corporation Device 0b23
+        Subsystem: Intel Corporation Device 0000
+        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 A routed to IRQ 255
+        NUMA node: 0
+        Capabilities: [40] Express (v2) Root Complex Event Collector, MSI 00
+                DevCap: MaxPayload 512 bytes, PhantFunc 0
+                        ExtTag- RBE-
+                DevCtl: CorrErr+ NonFatalErr+ FatalErr+ UnsupReq-
+                        RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
+                        MaxPayload 128 bytes, MaxReadReq 128 bytes
+                DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
+                RootCap: CRSVisible-
+                RootCtl: ErrCorrectable+ ErrNon-Fatal+ ErrFatal+ PMEIntEna- CRSVisible-
+                RootSta: PME ReqID 0000, PMEStatus- PMEPending-
+                DevCap2: Completion Timeout: Not Supported, TimeoutDis- NROPrPrP- LTR-
+                         10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt- EETLPPrefix-
+                         EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
+                         FRS-
+                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR- OBFF Disabled,
+        Capabilities: [80] Power Management version 3
+                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
+                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
+        Capabilities: [90] MSI: Enable- Count=1/1 Maskable+ 64bit-
+                Address: 00000000  Data: 0000
+                Masking: 00000000  Pending: 00000000
+        Capabilities: [100 v1] Advanced Error Reporting
+                UESta:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
+                UEMsk:  DLP- SDES+ TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq+ ACSViol-
+                UESvrt: DLP+ SDES- TLP+ FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
+                CESta:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr-
+                CEMsk:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr+
+                AERCap: First Error Pointer: 00, ECRCGenCap- ECRCGenEn- ECRCChkCap- ECRCChkEn-
+                        MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap-
+                HeaderLog: 00000000 00000000 00000000 00000000
+                RootCmd: CERptEn- NFERptEn- FERptEn-
+                RootSta: CERcvd- MultCERcvd- UERcvd- MultUERcvd-
+                         FirstFatal- NonFatalMsg- FatalMsg- IntMsg 0
+                ErrorSrc: ERR_COR: 0000 ERR_FATAL/NONFATAL: 0000
+        Capabilities: [160 v2] Root Complex Event Collector Endpoint Association
+                RCiEPBitmap: RCiEP at Device(s): 1, 6, 8-10, 12, 15
+                AssociatedBusNumbers: 02-08
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--
2.27.0


             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-24 22:39 Sean V Kelley [this message]
2020-09-02  8:41 ` Martin Mareš
2020-09-04  1:01   ` Sean V Kelley

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