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Linux's own r8169 through LDLS, deep idle, and the GPU plan

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The RTL8168 is now driven by Linux's r8169, unmodified, in a process.
`make ldls-r8169` stages it from the running kernel together with libphy,
mdio-bus, mdio_devres and the Realtek PHY driver, the kernel's BTF and
the RTL PHY firmware, and etc/schinit/ldls-r8169.job starts it at boot
with its log in /var/log/ldls-r8169.log. The native driver is out of the
registry; its code, now with Linux's 8168H setup, stays as the fallback.

LDLS grows what that needed:
- ldlsd loads a comma-separated module set in dependency order, each
  linking against the ones before it, with BTF read before any
  init_module runs;
- a driver core (bus match, driver probe), devres, kernel printf, real
  udelay/msleep/ktime and 1000 Hz jiffies, phylib's bitmaps and
  link_mode_params, firmware from /lib/firmware, and the symbols whose
  stub zero was a lie (list validity, try_module_get, dev_err_probe,
  eth_platform_get_mac_address);
- pdev->bus is a real pci_bus, and cmovcc from per-CPU memory is
  rewritten like the other %gs forms.
In QEMU all five modules load, link and initialise, and r8169 registers
and finds no device. Probe and traffic are untested until real hardware.

The kernel turns ASPM off on Realtek NIC links at boot, as r8169 does
through pci_disable_link_state, which a process cannot.

Idle CPUs enter ACPI _CST's C2 (CC6 on Zen) by port read or MWAIT when
the APIC timer keeps running, instead of only ever halting at C1.

docs/plan/gpu.md: amdgpu and nouveau through LDLS, with measurements.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-25 14:26:16 +01:00
commit 4ad49ed5f2
18 changed files with 1945 additions and 81 deletions
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36
kernel/dev/pci.c
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@ -678,6 +678,41 @@ pci_dump(struct sbuf *out, const char *arg)
}
}
// ASPM off on Realtek NICs, as Linux's r8169 does at probe through
// pci_disable_link_state(): "Disable ASPM L1 as that cause random device stop
// working problems as well as full system hangs". Here because the driver now
// runs in a process, and /dev/pci gives a process no config writes. Both ends
// of the link: the NIC's PCIe Link Control and the bridge above it, low two
// bits, L0s and L1.
static void
link_aspm_off(struct pci_dev *d)
{
uint8 cap = pci_find_cap(d, 0x10);
if (cap) {
uint32 v = pci_read32(d->bus, d->slot, d->func, cap + 0x10);
if (v & 3)
pci_write32(d->bus, d->slot, d->func, cap + 0x10, v & ~3u);
}
}
static void
realtek_aspm_off(void)
{
for (int i = 0; i < ndevs; i++) {
struct pci_dev *d = &devs[i];
if (d->vendor != 0x10EC || (d->device != 0x8168 && d->device != 0x8161 &&
d->device != 0x8125 && d->device != 0x8136))
continue;
link_aspm_off(d);
for (int j = 0; j < ndevs; j++)
if ((devs[j].header_type & 0x7F) == 1 &&
pci_read8(devs[j].bus, devs[j].slot, devs[j].func, PCI_SECONDARY_BUS) == d->bus)
link_aspm_off(&devs[j]);
kinfo("pci: %02x:%02x.%d Realtek NIC, ASPM off on its link\n",
d->bus, d->slot, d->func);
}
}
void
pci_init(void)
{
@ -693,6 +728,7 @@ pci_init(void)
scan_bus(0);
kinfo("pci: %d device%s\n", ndevs, ndevs == 1 ? "" : "s");
realtek_aspm_off();
// Before any driver binds: the line each device's config space names is
// the 8259's number, which is not the IOAPIC pin it is wired to. ACPI's