vasilito
57778e7898
Phase R15 (2026-06-07) — timekeeping / TSC sync. The
data side lands now; TSC sync itself is algorithmic
(mark_tsc_unstable in the kernel) and is not represented.
Changes:
1. ClocksourceQuirkFlags (mod.rs:415) with 4 bits:
PMTMR_BLACKLIST, PMTMR_GRAYLIST, TSC_UNSTABLE,
HPET_BROKEN. Only PMTMR bits fire today; TSC_UNSTABLE
and HPET_BROKEN are reserved for future kernel-side
use.
2. ClocksourceQuirkEntry (mod.rs:445) — vendor / device /
revision_lo / revision_hi / flags. matches() handles
vendor / device wildcards (0xFFFF) and revision range
(lo..=hi, with lo=0, hi=0xFF as the wildcard).
3. CLOCKSOURCE_FLAG_NAMES + parse_clocksource_toml +
load_clocksource_flags (toml_loader.rs) — new
[[clocksource_quirk]] TOML table type with vendor +
device + revision_lo + revision_hi + flags.
4. 1 new unit test: phase_r15_clocksource_quirk_entry_matches
exercises the range match + 4 wildcard combinations
(vendor, device, revision out of range, revision
wildcard). 126/126 tests pass.
5. quirks.d/35-clocksource.toml (44 lines) — 3 entries
sourced from Linux 7.1
drivers/clocksource/acpi_pm.c:
- Intel 82371AB_3 (PIIX4) 0x7113 rev 0..=2 → blacklist
- Intel 82801DB_0 (ICH4) 0x24C0 → graylist
- ServerWorks LE 0x0009 → graylist
cargo test: 126/126 (was 125, +1 for the new test).
cargo check: clean.
The kernel-side clocksource engine (R15 consumer) will
call load_clocksource_flags() at PMTMR probe time and
select / reject the PMTMR clocksource accordingly.
43 lines
1.3 KiB
TOML
43 lines
1.3 KiB
TOML
# Clocksource / timekeeping quirks — PCI device-based.
|
|
# Mined from Linux 7.1
|
|
# `drivers/clocksource/acpi_pm.c` `DECLARE_PCI_FIXUP_EARLY`
|
|
# entries (3 total):
|
|
# - Intel 82371AB_3 (PIIX4) — blacklisted
|
|
# - Intel 82801DB_0 (ICH4) — graylisted
|
|
# - ServerWorks LE — graylisted
|
|
#
|
|
# The PMTMR workaround switches the kernel's clocksource
|
|
# choice. `blacklist` means PMTMR is rejected; `graylist`
|
|
# means PMTMR is allowed at a downgraded rating (120).
|
|
#
|
|
# Phase R15 (2026-06-07). The compiled-in table is empty
|
|
# (`clocksource_table.rs`); runtime TOML is the data
|
|
# surface. TSC sync detection is algorithmic in the
|
|
# kernel (mark_tsc_unstable), not table-driven, so it
|
|
# is not represented here.
|
|
|
|
# Intel 82371AB_3 (PIIX4) — blacklist, revisions 0..=2
|
|
# "Has a bug so severe that it causes random time jumps
|
|
# of up to 5 seconds." (Linux comment)
|
|
[[clocksource_quirk]]
|
|
vendor = 0x8086
|
|
device = 0x7113
|
|
revision_lo = 0
|
|
revision_hi = 2
|
|
flags = ["pmtmr_blacklist"]
|
|
|
|
# Intel 82801DB_0 (ICH4) — graylist
|
|
# "The chipset may have PM-Timer Bug. We can fall back to
|
|
# the slower read." (Linux comment)
|
|
[[clocksource_quirk]]
|
|
vendor = 0x8086
|
|
device = 0x24C0
|
|
flags = ["pmtmr_graylist"]
|
|
|
|
# ServerWorks LE — graylist
|
|
# Same as ICH4; degraded PMTMR rating 120.
|
|
[[clocksource_quirk]]
|
|
vendor = 0x1166
|
|
device = 0x0009
|
|
flags = ["pmtmr_graylist"]
|