Simone
4697ce3e3b
Add a driver for the integrated memory controller (iMC) SMBus engine on Intel Skylake-X / Cascade Lake-X processors (socket LGA 2066, platform X299, PCU function 8086:2085). The engine provides two SMBus channels — one per pair of DIMM slots — over which SPD EEPROMs, DDR4 thermal sensors and third-party LED controllers are accessible. Exposing it as a pair of standard Linux I2C adapters lets existing tools (i2c-tools, lm-sensors) use it without bespoke sysfs hacks. Key design decisions: - ECAM MMIO access instead of CF8/CFC port I/O (SMM traps port writes) - Dynamic MCFG table parsing for mmcfg_base (no hardcoding) - Support for SMBus BYTE_DATA and WORD_DATA transfers - devm-managed resources with automatic cleanup - Global mutex to serialize transactions across both channels sharing the same ECAM mapping Signed-off-by: Simone Chifari <simone.chifari@gmail.com>
81 lines
1.7 KiB
Bash
Executable File
81 lines
1.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Smoke test for i2c-imc-skylake (pci_driver, no bus/dev/fn params).
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# Run after: make install OR make reload
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# Requires: root, i2c-tools (i2cdetect), module already loaded.
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set -euo pipefail
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PASS=0
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FAIL=0
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_ok() { echo "PASS: $*"; ((PASS++)) || true; }
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_fail() { echo "FAIL: $*"; ((FAIL++)) || true; }
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echo "=== adapter list ==="
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i2cdetect -l | grep -i imc || _fail "no imc adapters visible"
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_bus() {
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i2cdetect -l 2>/dev/null | grep -i "imc.*channel $1" | awk '{print $1}' | tr -d 'i2c-'
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}
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CH0=$(_bus 0)
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CH1=$(_bus 1)
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if [ -n "$CH0" ]; then
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_ok "ch0 adapter at i2c-$CH0"
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else
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_fail "ch0 adapter not found"
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fi
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if [ -n "$CH1" ]; then
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_ok "ch1 adapter at i2c-$CH1"
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else
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_fail "ch1 adapter not found"
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fi
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if [ -n "$CH0" ]; then
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echo ""
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echo "=== SPD scan ch0 (expect 0x50-0x57) ==="
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i2cdetect -r -y "$CH0" 2>/dev/null
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# at least one SPD slot must respond
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if i2cdetect -r -y "$CH0" 2>/dev/null | grep '50' >/dev/null; then
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_ok "SPD device at 0x50 on ch0"
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else
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_fail "no SPD device on ch0"
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fi
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fi
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if [ -n "$CH1" ]; then
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echo ""
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echo "=== SPD scan ch1 ==="
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i2cdetect -r -y "$CH1" 2>/dev/null
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fi
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echo ""
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echo "=== udev autoload ==="
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sudo rmmod i2c-imc-skylake
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sleep 1
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sudo udevadm trigger --subsystem-match=pci --action=add
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sleep 2
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if lsmod | grep i2c_imc_skylake >/dev/null; then
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_ok "udev autoload"
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else
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_fail "udev did not reload module — check /etc/modules-load.d/ or udev rules"
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fi
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echo ""
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echo "=== load/unload x5 (leak/oops) ==="
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for i in $(seq 1 5); do
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sudo rmmod i2c-imc-skylake
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sudo modprobe i2c-imc-skylake
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echo " cycle $i OK"
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done
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_ok "5 load/unload cycles completed"
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echo ""
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echo "=== dmesg tail ==="
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dmesg | tail -20
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echo ""
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echo "=== result: $PASS passed, $FAIL failed ==="
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[ "$FAIL" -eq 0 ]
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