On Mon, Feb 28, 2011 at 06:36:34PM +0100, Tejun Heo wrote:
> On Mon, Feb 28, 2011 at 06:05:56PM +0100, Philippe De Muyter wrote:
> > 5: 17183 XT-PIC-XT-PIC ata_piix, ata_piix, ehci_hcd:usb1, ehci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb5, uhci_hcd:usb6, uhci_hcd:usb7, uhci_hcd:usb8
>
> So, usb7 and ata_piix share the same IRQ line.
>
> > [ 1.517781] usb 7-1: New USB device found, idVendor=067b, idProduct=2303
> > [ 1.517837] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> > [ 1.517883] usb 7-1: Product: USB-Serial Controller
> > [ 1.517928] usb 7-1: Manufacturer: Prolific Technology Inc.
> ...
> > [ 4.327431] usbcore: registered new interface driver usbserial
> > [ 4.327585] USB Serial support registered for generic
> > [ 4.327747] usbcore: registered new interface driver usbserial_generic
> > [ 4.327774] usbserial: USB Serial Driver core
> ...
> > [ 4.419657] USB Serial support registered for pl2303
> ...
> > [ 4.431805] usb 7-1: pl2303 converter now attached to ttyUSB0
> > [ 4.431846] usbcore: registered new interface driver pl2303
> > [ 4.431875] pl2303: Prolific PL2303 USB to serial adaptor driver
>
> I believe this is the GPS thingie?
Yes, that's it. It loads the `usbserial' and `pl2303' modules.
>
> ...
> > [ 175.706014] ata1: lost interrupt (Status 0x50)
> > [ 175.706040] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
> > [ 175.706050] ata1.00: failed command: READ DMA
> > [ 175.706062] ata1.00: cmd c8/00:08:28:41:01/00:00:00:00:00/e1 tag 0 dma 4096 in
> > [ 175.706064] res 40/00:00:01:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout)
> > [ 175.706079] ata1.00: status: { DRDY }
>
> There was no screaming IRQ but it definitely looks like IRQ delivery
> is gone at this point.
I confirm. After that, any `cat /proc/interrupts' gives the same interrupt count (17183)
as above for irq 5 (shared by ata_piix and *usb*)
>
> > [ 175.706091] ata1: hard resetting link
> > [ 176.162049] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> > [ 181.165024] ata1.00: qc timeout (cmd 0x27)
> > [ 181.165034] ata1.00: failed to read native max address (err_mask=0x4)
> > [ 181.165043] ata1.00: revalidation failed (errno=-5)
>
> Hardreset and IDENTIFY are executed by polling on ata_piix and
> READ_NATIVE_MAX is the first command executed using IRQ and that's the
> first thing in the recovery sequence which fails.
>
> > [ 181.165054] ata1: hard resetting link
> > [ 181.621053] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> > [ 191.624025] ata1.00: qc timeout (cmd 0x27)
> > [ 191.624036] ata1.00: failed to read native max address (err_mask=0x4)
> > [ 191.624045] ata1.00: revalidation failed (errno=-5)
> > [ 191.624053] ata1: limiting SATA link speed to 1.5 Gbps
> > [ 191.624065] ata1: hard resetting link
> > [ 192.080046] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
> > [ 202.083023] ata1.00: qc timeout (cmd 0x27)
> > [ 202.083033] ata1.00: failed to read native max address (err_mask=0x4)
> > [ 202.083042] ata1.00: revalidation failed (errno=-5)
> > [ 202.083049] ata1.00: disabled
> > [ 202.083066] ata1: hard resetting link
>
> And it never comes back. Specifying kernel parameter 'irqpoll' might
> help but it looks like somehow the GPS thingie kills the IRQ line
> completely.
My process listening to the GPS receiver continues to get GPS messages each second.
>
> cc'ing Greg and linux-usb. Hey, USB folks, it seems accessing a USB
> GPS device kills IRQ delivery to ata_piix sharing the same IRQ line as
> the USB host. Any ideas on what's going on? The original messages
> can be read from...
>
> http://www.spinics.net/lists/linux-ide/msg40425.html
> http://www.spinics.net/lists/linux-ide/msg40428.html
>
> Thanks.
>
> --
> tejun
--
Philippe De Muyter +32 2 6101532 Macq SA rue de l'Aeronef 2 B-1140 Bruxelles
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