[src/trunk]: src/sys/dev/pci Add PCIe 4.0 stuff a little:

[msaitoh <msaitoh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2b038f621633
branches:  trunk
changeset: 968680:2b038f621633
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Sat Jan 25 08:13:39 2020 +0000

description:
Add PCIe 4.0 stuff a little:

 - 10-bit Tag Requester/Completer.
 - Add Data link Feature extended capability.
 - Add Physical Layer 16.0 GT/s extended capability. Not decode yet.

diffstat:

 sys/dev/pci/pci_subr.c |  29 +++++++++++++++++++++++++----
 sys/dev/pci/pcireg.h   |  24 +++++++++++++++++++++++-
 2 files changed, 48 insertions(+), 5 deletions(-)

diffs (130 lines):

diff -r eb21d37a9366 -r 2b038f621633 sys/dev/pci/pci_subr.c
--- a/sys/dev/pci/pci_subr.c    Sat Jan 25 07:59:14 2020 +0000
+++ b/sys/dev/pci/pci_subr.c    Sat Jan 25 08:13:39 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pci_subr.c,v 1.220 2020/01/25 07:59:14 msaitoh Exp $   */
+/*     $NetBSD: pci_subr.c,v 1.221 2020/01/25 08:13:39 msaitoh Exp $   */
 
 /*
  * Copyright (c) 1997 Zubin D. Dittia.  All rights reserved.
@@ -40,7 +40,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pci_subr.c,v 1.220 2020/01/25 07:59:14 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pci_subr.c,v 1.221 2020/01/25 08:13:39 msaitoh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_pci.h"
@@ -2165,6 +2165,8 @@
                printf("Reserved\n");
                break;
        }
+       onoff("10-bit Tag Completer Supported", reg, PCIE_DCAP2_TBT_COMP);
+       onoff("10-bit Tag Requester Supported", reg, PCIE_DCAP2_TBT_REQ);
        printf("      OBFF Supported: ");
        switch (__SHIFTOUT(reg, PCIE_DCAP2_OBFF)) {
        case 0x0:
@@ -2217,6 +2219,7 @@
        onoff("LTR Mechanism Enabled", reg, PCIE_DCSR2_LTR_MEC);
        onoff("Emergency Power Reduction Request", reg,
            PCIE_DCSR2_EMGPWRRED_REQ);
+       onoff("10-bit Tag Requester Enabled", reg, PCIE_DCSR2_TBT_REQ);
        printf("      OBFF: ");
        switch (__SHIFTOUT(reg, PCIE_DCSR2_OBFF_EN)) {
        case 0x0:
@@ -4165,6 +4168,24 @@
 /* XXX pci_conf_print_rtr_cap */
 /* XXX pci_conf_print_desigvndsp_cap */
 /* XXX pci_conf_print_vf_resizbar_cap */
+
+static void
+pci_conf_print_dlf_cap(const pcireg_t *regs, int extcapoff)
+{
+       pcireg_t reg;
+
+       printf("\n  Data link Feature Register\n");
+       reg = regs[o2i(extcapoff + PCI_DLF_CAP)];
+       printf("    Capability register: 0x%08x\n", reg);
+       onoff("Scaled Flow Control", reg, PCI_DLF_LFEAT_SCLFCTL);
+       onoff("DLF Exchange enable", reg, PCI_DLF_CAP_XCHG);
+
+       reg = regs[o2i(extcapoff + PCI_DLF_STAT)];
+       printf("    Status register: 0x%08x\n", reg);
+       onoff("Scaled Flow Control", reg, PCI_DLF_LFEAT_SCLFCTL);
+       onoff("Remote DLF supported Valid", reg, PCI_DLF_STAT_RMTVALID);
+}
+
 /* XXX pci_conf_print_hierarchyid_cap */
 /* XXX pci_conf_print_npem_cap */
 
@@ -4251,8 +4272,8 @@
          NULL },
        { PCI_EXTCAP_VF_RESIZBAR, "VF Resizable BARs",
          NULL },
-       { 0x25, "unknown", NULL },
-       { 0x26, "unknown", NULL },
+       { PCI_EXTCAP_DLF, "Data link Feature", pci_conf_print_dlf_cap },
+       { PCI_EXTCAP_PYSLAY_16GT, "Physical Layer 16.0 GT/s", NULL },
        { 0x27, "unknown", NULL },
        { PCI_EXTCAP_HIERARCHYID, "Hierarchy ID",
          NULL },
diff -r eb21d37a9366 -r 2b038f621633 sys/dev/pci/pcireg.h
--- a/sys/dev/pci/pcireg.h      Sat Jan 25 07:59:14 2020 +0000
+++ b/sys/dev/pci/pcireg.h      Sat Jan 25 08:13:39 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pcireg.h,v 1.149 2020/01/22 02:51:38 msaitoh Exp $     */
+/*     $NetBSD: pcireg.h,v 1.150 2020/01/25 08:13:39 msaitoh Exp $     */
 
 /*
  * Copyright (c) 1995, 1996, 1999, 2000
@@ -1097,6 +1097,8 @@
 #define PCIE_DCAP2_LTR_MEC     __BIT(11)      /* LTR Mechanism Supported */
 #define PCIE_DCAP2_TPH_COMP    __BITS(13, 12) /* TPH Completer Supported */
 #define PCIE_DCAP2_LNSYSCLS    __BITS(15, 14) /* LN System CLS */
+#define PCIE_DCAP2_TBT_COMP    __BIT(16)      /* 10-bit Tag Completer Supp. */
+#define PCIE_DCAP2_TBT_REQ     __BIT(17)      /* 10-bit Tag Requester Supp. */
 #define PCIE_DCAP2_OBFF                __BITS(19, 18) /* Optimized Buffer Flush/Fill*/
 #define PCIE_DCAP2_EXTFMT_FLD  __BIT(20)      /* Extended Fmt Field Support */
 #define PCIE_DCAP2_EETLP_PREF  __BIT(21)      /* End-End TLP Prefix Support */
@@ -1114,6 +1116,7 @@
 #define PCIE_DCSR2_IDO_COMP    __BIT(9)       /* IDO Completion Enable */
 #define PCIE_DCSR2_LTR_MEC     __BIT(10)      /* LTR Mechanism Enable */
 #define PCIE_DCSR2_EMGPWRRED_REQ __BIT(11)     /* Emergency Power Reduc. Req */
+#define PCIE_DCSR2_TBT_REQ     __BIT(12)      /* 10-bit Tag Requester Ena. */
 #define PCIE_DCSR2_OBFF_EN     __BITS(14, 13) /* OBFF Enable */
 #define PCIE_DCSR2_EETLP       __BIT(15)      /* End-End TLP Prefix Blcking */
 #define PCIE_LCAP2     0x2c    /* Link Capabilities 2 Register */
@@ -1525,6 +1528,8 @@
 #define        PCI_EXTCAP_RTR          0x0022  /* Readiness Time Reporting */
 #define        PCI_EXTCAP_DESIGVNDSP   0x0023  /* Designated Vendor-Specific */
 #define        PCI_EXTCAP_VF_RESIZBAR  0x0024  /* VF Resizable BAR */
+#define        PCI_EXTCAP_DLF          0x0025  /* Data link Feature */
+#define        PCI_EXTCAP_PYSLAY_16GT  0x0026  /* Physical Layer 16.0 GT/s */
 #define        PCI_EXTCAP_HIERARCHYID  0x0028  /* Hierarchy ID */
 #define        PCI_EXTCAP_NPEM         0x0029  /* Native PCIe Enclosure Management */
 
@@ -2151,6 +2156,23 @@
  */
 
 /*
+ * Extended capability ID: 0x0025
+ * Data link Feature
+ */
+#define        PCI_DLF_CAP     0x04    /* Capability register */
+#define        PCI_DLF_LFEAT         __BITS(22, 0)  /* Local DLF supported */
+#define        PCI_DLF_LFEAT_SCLFCTL __BIT(0)       /* Scaled Flow Control */
+#define        PCI_DLF_CAP_XCHG      __BIT(31)      /* DLF Exchange enable */
+#define        PCI_DLF_STAT    0x08    /* Status register */
+       /* Bit 22:0 is the same as PCI_DLF_CAP_LINKFEAT */
+#define        PCI_DLF_STAT_RMTVALID __BIT(31)      /* Remote DLF supported Valid */
+
+/*
+ * Extended capability ID: 0x0026
+ * Physical Layer 16.0 GT/s
+ */
+
+/*
  * Extended capability ID: 0x0028
  * Hierarchy ID
  */