Bug 16553 - build for i686 - no MSI for devices that supports it
Summary: build for i686 - no MSI for devices that supports it
Status: RESOLVED OBSOLETE
Alias: None
Product: Platform Specific/Hardware
Classification: Unclassified
Component: i386 (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: platform_i386
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-08-10 12:34 UTC by NiTr0
Modified: 2013-12-10 21:54 UTC (History)
1 user (show)

See Also:
Kernel Version: 2.6.35
Subsystem:
Regression: Yes
Bisected commit-id:


Attachments
faulty kernel config (64.07 KB, text/plain)
2010-08-10 12:34 UTC, NiTr0
Details

Description NiTr0 2010-08-10 12:34:00 UTC
Created attachment 27397 [details]
faulty kernel config

I updated kernel into router distro - and saw that MSI isn't enabled for devices that supports it; by default it uses IO-APIC-fasteoi
Here is, for example, listing of /proc/interrupts for test platform (NForce4-based MB with onboard NIC - that will support MSI):

# cat /proc/interrupts
           CPU0
  0:        131   IO-APIC-edge      timer
  1:        274   IO-APIC-edge      i8042
  6:          2   IO-APIC-edge      floppy
  7:          1   IO-APIC-edge
  8:          1   IO-APIC-edge      rtc0
  9:          0   IO-APIC-fasteoi   acpi
 14:          0   IO-APIC-edge      pata_amd
 15:          0   IO-APIC-edge      pata_amd
 20:          0   IO-APIC-fasteoi   sata_nv
 21:          0   IO-APIC-fasteoi   sata_nv
 22:        895   IO-APIC-fasteoi   ehci_hcd:usb2
 23:       2139   IO-APIC-fasteoi   ohci_hcd:usb1, eth0
NMI:          0   Non-maskable interrupts
LOC:       7694   Local timer interrupts
SPU:          0   Spurious interrupts
PMI:          0   Performance monitoring interrupts
PND:          0   Performance pending work
RES:          0   Rescheduling interrupts
CAL:          0   Function call interrupts
TLB:          0   TLB shootdowns
TRM:          0   Thermal event interrupts
THR:          0   Threshold APIC interrupts
MCE:          0   Machine check exceptions
MCP:          1   Machine check polls
ERR:          1
MIS:          0

On another platform (which have Yukon2 PCI-E card on K8M890 MB) - there is also no MSI.

MSI in kernel is enabled; I get new config just by 'make oldconfig' with older 2.6.32 config in directory - so differences will be minimal.

For x86_64 build (on other distro) all looks OK. On 2.6.32 kernel that was used later in this distro - also all is OK.
Comment 1 NiTr0 2010-08-10 20:58:18 UTC
Strange. When I inserted Yukon2 into NForce4 - I've got MSI IRQ handling for it's interrupt.
AFAIK MSI is always supported for PCI-E chipsets, isn't it? So why on K8M890 it's absent?

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