Hello,
I am running Debian Jesse on an Intel Broadwell-DE and I am having difficulties enabling the SMBUS drv=i801_smbus) interrupts.
I removed the "i2c_i801 disable_features-0x10" in the options.config file under '/etc/modprobe.d' but interrupts are not working.
The i801_smbus driver is setup to enable the 'INTREN' bit of SMBUS Host control register (SMBUS-D31:f3).
According to spec, when this bit is enable the completion of a command is supposed to interrupt the processor.
I can see the interrupt pending in the PCI configuration space of the SMBUS device but its seems the CPU never sees this interrupt.
The interrupt counters in '/proc/interrupts' never get updated and i2c operations timeout, see printouts below.
As shown below, i enabled the apic=debug via the kernel command line but it seems the registers displayed are the values
before the SMBUS driver gets a chance to allocate its interrupt.
Do you know of any utilities/commands to display the local-APIC and IO-APIC contents?
Any ideas why processor is not seeing the interrupt? Perhaps, there is a MSR type register in the CPU core that needs to be enabled,
sort of like a global interrupt enabled bit??
I would appreciate your help in this matter.
thank you,
#####
:~$ cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
0: 11 0 0 0 0 0 0 0 IR-IO-APIC 2-edge timer
4: 5399 0 0 0 0 0 0 0 IR-IO-APIC 4-edge serial
9: 0 0 0 0 0 0 0 0 IR-IO-APIC 9-fasteoi acpi
- 18: 0 0 0 0 0 0 0 0 IR-IO-APIC 18-fasteoi i801_smbus
24: 3535 0 0 0 0 0 0 0 IR-PCI-MSI 512000-edge ahci[0000:00:1f.2]
25: 1 0 0 0 0 0 0 0 IR-PCI-MSI 2621440-edge eth0
26: 65305 0 0 0 0 0 0 0 IR-PCI-MSI 2621441-edge eth0-TxRx-0
########
The PCI config space of the SMBUS device shows interrupt pending on PCISTST register (bit3, offset6-7):
########
:~$ sudo lspci -s 0000:00:1f.3 -vv -xxx -k
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 05)
Subsystem: Intel Corporation Device 7270
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx+
Interrupt: pin C routed to IRQ 18
Region 0: Memory at fe41a000 (64-bit, non-prefetchable) [size=256]
Region 4: I/O ports at 2020 [size=32]
Kernel driver in use: i801_smbus
00: 86 80 22 8c 03 00 88 02 05 00 05 0c 00 00 00 00
10: 04 a0 41 fe 00 00 00 00 00 00 00 00 00 00 00 00
20: 21 20 00 00 00 00 00 00 00 00 00 00 86 80 70 72
30: 00 00 00 00 00 00 00 00 00 00 00 00 07 03 00 00
40: 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60: 03 04 04 00 00 00 08 08 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 b1 0f 06 08 00 00 00 00
#########
The device driver (i801_smbus) times-out with any I2c operation:
#########
:~$ sudo i2cdetect -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: i801_smbus 0000:00:1f.3: Timeout waiting for interrupt!
i801_smbus 0000:00:1f.3: Transaction timeout
-- i801_smbus 0000:00:1f.3: Timeout waiting for interrupt!
i801_smbus 0000:00:1f.3: Transaction timeout
-- i801_smbus 0000:00:1f.3: Timeout waiting for interrupt!
i801_smbus 0000:00:1f.3: Transaction timeout
-- i801_smbus 0000:00:1f.3: Timeout waiting for interrupt!
i801_smbus 0000:00:1f.3: Transaction timeout
-- i801_smbus 0000:00:1f.3: Timeout waiting for interrupt!
#############
Following are details of the platform:
############
:~$ inxi -F
System: Host: debian Kernel: 4.9.8-platina-mk1-amd64 x86_64 (64 bit)
Console: tty 0 Distro: Debian GNU/Linux 8
Machine: Mobo: Intel model: Camelback Mountain Platina DC v: 1.0
Bios: coreboot v: 6a724f1-dirty date: 03/14/2017
CPU: Quad core Intel Xeon D-1527 (-HT-MCP-) cache: 6144 KB
Clock Speeds: 1: 2194 MHz 2: 2194 MHz 3: 2194 MHz 4: 2194 MHz
5: 2194 MHz 6: 2194 MHz 7: 2194 MHz 8: 2194 MHz
Graphics: Card: Failed to Detect Video Card!
Display Server: N/A driver: N/A
tty size: 80x24 Advanced Data: N/A out of X
Network: Card-1: Broadcom Device b960
IF: N/A state: N/A speed: N/A duplex: N/A mac: N/A
Card-2: Broadcom Device b960
IF: N/A state: N/A speed: N/A duplex: N/A mac: N/A
Card-3: Intel Device 15ab
IF: N/A state: N/A speed: N/A duplex: N/A mac: N/A
Card-4: Intel Device 15ab
IF: N/A state: N/A speed: N/A duplex: N/A mac: N/A
Card-5: Intel I210 Gigabit Network Connection driver: igb
IF: eth0 state: up speed: 1000 Mbps duplex: full
mac: 02:46:8a:00:0b:86
Drives: HDD Total Size: 128.0GB (17.9% used)
ID-1: /dev/sda model: SanDisk_SD8SMAT1 size: 128.0GB
Partition: ID-1: / size: 102G used: 6.2G (7%) fs: ext4 dev: /dev/sda2
ID-2: swap-1 size: 17.06GB used: 0.00GB (0%) fs: swap dev: /dev/sda3
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: None detected - is lm-sensors installed and configured?
Info: Processes: 110 Uptime: 6:22 Memory: 69.7/16014.7MB
Init: systemd runlevel: 5 Client: Shell (bash) inxi: 2.1.28
########
Enabling the "apic=debug" gives a view of the Local-APIC and IO-APIC during initialization, see 'dmesg' log below.
It seems this view is displayed before the i801_smbus has a chance to allocation the interrupt via its request_irq() system call
since pin12 (irq12 = 18decimal) is disabled.
######
| [ | 2.079044] printing local APIC contents on CPU#0/0: | ||
| [ | 2.079046] ... APIC ID: | 00000000 (0) | |
| [ | 2.082155] ... APIC VERSION: 01060015 | ||
| [ | 2.084882] ... APIC TASKPRI: 00000000 (00) | ||
| [ | 2.084883] ... APIC PROCPRI: 00000000 | ||
| [ | 2.084885] ... APIC LDR: 00000001 | ||
| [ | 2.084886] ... APIC SPIV: 000001ff | ||
| [ | 2.084887] ... APIC ISR field: | ||
| [ | 2.084890] 0000000000000000000000000000000000000000000000000000000000000000 | ||
| [ | 2.084899] ... APIC TMR field: | ||
| [ | 2.084901] 0000000000000000000000000000000000000000000000000000000000000000 | ||
| [ | 2.084910] ... APIC IRR field: | ||
| [ | 2.084912] 0000000000000000000000000000000000000000000000000000000000008000 | ||
| [ | 2.084921] ... APIC ESR: 00000000 | ||
| [ | 2.084923] ... APIC ICR: 000008fb | ||
| [ | 2.084924] ... APIC ICR2: 00000004 | ||
| [ | 2.084926] ... APIC LVTT: 000400ef | ||
| [ | 2.084927] ... APIC LVTPC: 00000400 | ||
| [ | 2.084928] ... APIC LVT0: 00010700 | ||
| [ | 2.084930] ... APIC LVT1: 00000400 | ||
| [ | 2.084931] ... APIC LVTERR: 000000fe | ||
| [ | 2.084932] ... APIC TMICT: 00000000 | ||
| [ | 2.084934] ... APIC TMCCT: 00000000 | ||
| [ | 2.084935] ... APIC TDCR: 00000000 | ||
| [ | 2.084947] number of MP IRQ sources: 15. | ||
| [ | 2.084949] number of IO-APIC #8 registers: 24. | ||
| [ | 2.084951] number of IO-APIC #9 registers: 24. | ||
| [ | 2.084952] testing the IO APIC....................... | ||
| [ | 2.089246] IO APIC #8...... | ||
| [ | 2.089247] .... register #00: 08000000 | ||
| [ | 2.089248] ....... | : physical APIC id: 08 | |
| [ | 2.089250] ....... | : Delivery Type: 0 | |
| [ | 2.089251] ....... | : LTS | : 0 |
| [ | 2.089252] .... register #01: 00170020 | ||
| [ | 2.089253] ....... | : max redirection entries: 17 | |
| [ | 2.089255] ....... | : PRQ implemented: 0 | |
| [ | 2.089256] ....... | : IO APIC version: 20 | |
| [ | 2.089257] .... IRQ redirection table: | ||
| [ | 2.089258] IOAPIC 0: | ||
| [ | 2.089266] pin00, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089272] pin01, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089278] pin02, enabled , edge , high, V(02), IRR(0), S(0), remapped, I(8001), Z(0) | ||
| [ | 2.089284] pin03, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089290] pin04, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089295] pin05, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089301] pin06, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089306] pin07, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089312] pin08, disabled, edge , high, V(C1), IRR(0), S(0), physical, D(5B), M(2) | ||
| [ | 2.089318] pin09, enabled , level, high, V(09), IRR(0), S(0), remapped, I(40008), Z(0) | ||
| [ | 2.089323] pin0a, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089329] pin0b, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089334] pin0c, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089340] pin0d, disabled, edge , high, V(59), IRR(0), S(0), remapped, I(3210642), Z(2) | ||
| [ | 2.089346] pin0e, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089351] pin0f, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089357] pin10, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089362] pin11, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089368] pin12, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089373] pin13, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089379] pin14, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089384] pin15, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089390] pin16, disabled, edge , high, V(1C), IRR(0), S(0), logical , D(FC), M(2) | ||
| [ | 2.089396] pin17, disabled, edge , high, V(BB), IRR(0), S(0), remapped, I(35CE6B9C), Z(2) | ||
| [ | 2.089399] IO APIC #9...... | ||
| [ | 2.089400] .... register #00: 09000000 | ||
| [ | 2.089402] ....... | : physical APIC id: 09 | |
| [ | 2.089403] ....... | : Delivery Type: 0 | |
| [ | 2.089404] ....... | : LTS | : 0 |
| [ | 2.089405] .... register #01: 00170020 | ||
| [ | 2.089406] ....... | : max redirection entries: 17 | |
| [ | 2.089407] ....... | : PRQ implemented: 0 | |
| [ | 2.089409] ....... | : IO APIC version: 20 | |
| [ | 2.089410] .... register #02: 00000000 | ||
| [ | 2.089411] ....... | : arbitration: 00 | |
| [ | 2.089412] .... register #03: 00000001 | ||
| [ | 2.089413] ....... | : Boot DT | : 1 |
| [ | 2.089414] .... IRQ redirection table: | ||
| [ | 2.089415] IOAPIC 1: | ||
| [ | 2.089420] pin00, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089424] pin01, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089428] pin02, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089432] pin03, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089436] pin04, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089440] pin05, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089444] pin06, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089448] pin07, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089452] pin08, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089455] pin09, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089459] pin0a, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089464] pin0b, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089467] pin0c, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089471] pin0d, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089475] pin0e, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089479] pin0f, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089483] pin10, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089487] pin11, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089491] pin12, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089495] pin13, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089499] pin14, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089503] pin15, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089507] pin16, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089511] pin17, disabled, edge , high, V(00), IRR(0), S(0), physical, D(00), M(0) | ||
| [ | 2.089512] IRQ to pin mappings: | ||
| [ | 2.089514] IRQ0 -> 0:2 | ||
| [ | 2.089518] IRQ1 -> 0:1 | ||
| [ | 2.089521] IRQ3 -> 0:3 | ||
| [ | 2.089524] IRQ4 -> 0:4 | ||
| [ | 2.089527] IRQ5 -> 0:5 | ||
| [ | 2.089530] IRQ6 -> 0:6 | ||
| [ | 2.089533] IRQ7 -> 0:7 | ||
| [ | 2.089536] IRQ8 -> 0:8 | ||
| [ | 2.089539] IRQ9 -> 0:9 | ||
| [ | 2.089542] IRQ10 -> 0:10 | ||
| [ | 2.089545] IRQ11 -> 0:11 | ||
| [ | 2.089548] IRQ12 -> 0:12 | ||
| [ | 2.089551] IRQ13 -> 0:13 | ||
| [ | 2.089554] IRQ14 -> 0:14 | ||
| [ | 2.089557] IRQ15 -> 0:15 | ||
| [ | 2.089560] IRQ16 -> 0:16 | ||
| [ | 2.089562] IRQ19 -> 0:19 | ||
| [ | 2.089566] .................................... done. |
###########