[src/trunk]: src/sys/dev/pci The downstream port of PCIe switch is not a root...

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

details:   https://anonhg.NetBSD.org/src/rev/0cdcb3c27630
branches:  trunk
changeset: 994969:0cdcb3c27630
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Fri Nov 30 08:19:45 2018 +0000

description:
The downstream port of PCIe switch is not a root port, so don't print
root port related register. For example, Intel 63xxESB controller's
downstream port device was printed by pcictl(8) with this bug:

-----------------------------
PCI configuration registers:
  Common header:
    0x00: 0x35108086 0x00100147 0x06040001 0x00010010

    Vendor Name: Intel (0x8086)
    Device Name: 63xxESB PCI Express Downstream Port #1 (0x3510)
(snip)
  Capability register at 0x44       <=============
    type: 0x10 (PCI Express)
  Capability register at 0x60       <============= 0x60 - 0x44 = 0x1c
    type: 0x05 (MSI)
  Capability register at 0x70
    type: 0x01 (Power Management)
  Capability register at 0x80
    type: 0x0d (Subsystem vendor ID)
(snip)
  PCI Message Signaled Interrupt
    Message Control register: 0x0080
      MSI Enabled: off
      Multiple Message Capable: no (1 vector)
      Multiple Message Enabled: off (1 vector)
      64 Bit Address Capable: on
      Per-Vector Masking Capable: off
      Extended Message Data Capable: off
      Extended Message Data Enable: off
    Message Address (lower) register: 0x00000000
    Message Address (upper) register: 0x00000000
    Message Data register: 0x0000
(snip)
  PCI Express Capabilities Register
(snip)
    Root Control Register: 0x7005       <=== 0x7005 is the first two byte
      SERR on Correctable Error Enable: on   of the MSI capability structure
      SERR on Non-Fatal Error Enable: off
      SERR on Fatal Error Enable: on
      PME Interrupt Enable: off
      CRS Software Visibility Enable: off
    Root Capability Register: 0x0080
      CRS Software Visibility: off
    Root Status Register: 0x00000000
      PME Requester ID: 0x0000
      PME was asserted: off
      another PME is pending: off

  Device-dependent header:
    0x40: 0x00c00000 0x00616010 0x00000001 0x00005026  |   |<- PCIe      |
    0x50: 0x0203f441 0x10010020 0x00000000 0x004803c0  |               ->|
    0x60: 0x00807005 0x00000000 0x00000000 0x00000000  |<-     MSI     ->|
    0x70: 0xc8028001 0x00000100 0x00000000 0x00000000  |<-     PM      ->|
    0x80: 0x0000000d 0x00000000 0x00000000 0x00000000  |<- subsystem ID  |
--------------------------------------

diffstat:

 sys/dev/pci/pci_subr.c |  5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diffs (26 lines):

diff -r 9e35f0e6944a -r 0cdcb3c27630 sys/dev/pci/pci_subr.c
--- a/sys/dev/pci/pci_subr.c    Fri Nov 30 05:49:23 2018 +0000
+++ b/sys/dev/pci/pci_subr.c    Fri Nov 30 08:19:45 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pci_subr.c,v 1.207 2018/11/05 03:51:31 msaitoh Exp $   */
+/*     $NetBSD: pci_subr.c,v 1.208 2018/11/30 08:19:45 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 1.207 2018/11/05 03:51:31 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pci_subr.c,v 1.208 2018/11/30 08:19:45 msaitoh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_pci.h"
@@ -1791,7 +1791,6 @@
        case PCIE_XCAP_TYPE_DOWN:       /* 0x6 */
                printf("Downstream Port of PCI Express Switch\n");
                check_slot = true;
-               check_rootport = true;
                break;
        case PCIE_XCAP_TYPE_PCIE2PCI:   /* 0x7 */
                printf("PCI Express to PCI/PCI-X Bridge\n");