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limits: 256 PCI functions, 128 sockets and devices, 64 USB interfaces

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The fixed tables that a bigger machine than the one they were written
on reaches first, each raised to where it costs little:

  NPCI       64 -> 256   a desktop with cards and Thunderbolt passes 64,
                         and the devices past it -- often the disk or
                         NIC last in bus order -- were ignored; 44 KB
  NSOCK      32 -> 128   Unix sockets, which a desktop session uses by
                         the dozen; 4.9 KB each, 470 KB in all
  NDEVICE    32 -> 128   120 bytes each
  NIFDEV     16 -> 64    one dock is a hub, Ethernet, audio and a card
                         reader at two or three interfaces apiece
  NETIF_MAX   4 -> 8

Device names took one digit and clamped there, so the tenth device of
a kind and every one after it was named "...9". Two digits now.

Checked under QEMU with two bridges of test devices: 68 functions,
all in lspci, /proc/pci and /sys/bus/pci.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-23 13:54:37 +02:00
commit 4805dbd892
6 changed files with 19 additions and 12 deletions
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5
include/pci.h
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@ -53,7 +53,10 @@
#define PCI_ANY 0xFFFF // wildcard in a match table
#define NPCI 64 // devices we will remember
// Devices we will remember. A laptop has 30 to 60 functions, a desktop with
// a couple of cards and Thunderbolt more than 64, and every one past the limit
// was ignored -- including whatever disk or NIC came last in bus order.
#define NPCI 256
struct pci_bar {
uint64 base; // already masked; 0 means "no BAR here"