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From: Denis Vlasenko <vda@ilport.com.ua>
To: thomas.mey3r@arcor.de
Subject: Re: 2.6.14-rc2-ge484585e: kexec into same kernel: irq 11 nobody cared; but ehci_hcd should
Date: Sat, 24 Sep 2005 15:30:42 +0300
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On Saturday 24 September 2005 14:56, thomas.mey3r@arcor.de wrote:
> Hi.
> 
> I played a bit with the new kexec function:
> 
> when i kexec into the same kernel i get this error message:
> 
> [17179593.108000] ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11
> [17179593.108000] PCI: setting IRQ 11 as level-triggered
> [17179593.108000] ACPI: PCI Interrupt 0000:00:10.3[D] -> Link [LNKD] -> GSI 11 (level, low) -> IRQ 11
> [17179593.108000] ehci_hcd 0000:00:10.3: EHCI Host Controller
> [17179593.124000] ehci_hcd 0000:00:10.3: new USB bus registered, assigned bus number 4
> [17179593.936000] irq 11: nobody cared (try booting with the "irqpoll" option)
> [17179593.936000]  [<c0103f9e>] dump_stack+0x1e/0x20
> [17179593.936000]  [<c013dc6b>] __report_bad_irq+0x2b/0x90
> [17179593.936000]  [<c013dd90>] note_interrupt+0x90/0xf0
> [17179593.936000]  [<c013d69a>] __do_IRQ+0xca/0xe0
> [17179593.936000]  [<c010530c>] do_IRQ+0x1c/0x30
> [17179593.936000]  [<c0103b26>] common_interrupt+0x1a/0x20
> [17179593.936000]  [<c0120ffa>] do_softirq+0x2a/0x30
> [17179593.936000]  [<c01210a5>] irq_exit+0x35/0x40
> [17179593.936000]  [<c0105311>] do_IRQ+0x21/0x30
> [17179593.936000]  [<c0103b26>] common_interrupt+0x1a/0x20
> [17179593.936000]  [<c013d931>] setup_irq+0xb1/0x110
> [17179593.936000]  [<c013dae6>] request_irq+0x86/0xb0
> [17179593.936000]  [<ec99c344>] usb_add_hcd+0x234/0x3a0 [usbcore]
> [17179593.936000]  [<ec9a3a59>] usb_hcd_pci_probe+0x269/0x390 [usbcore]
> [17179593.936000]  [<c01da239>] pci_call_probe+0x19/0x20
> [17179593.936000]  [<c01da297>] __pci_device_probe+0x57/0x70
> [17179593.936000]  [<c01da2df>] pci_device_probe+0x2f/0x60
> [17179593.936000]  [<c021fa49>] driver_probe_device+0x39/0xc0
> [17179593.936000]  [<c021fbaf>] __driver_attach+0x4f/0x60
> [17179593.936000]  [<c021ef84>] bus_for_each_dev+0x54/0x80
> [17179593.936000]  [<c021fbe8>] driver_attach+0x28/0x30
> [17179593.936000]  [<c021f49d>] bus_add_driver+0x7d/0xe0
> [17179593.936000]  [<c0220098>] driver_register+0x78/0x80
> [17179593.936000]  [<c01da5d0>] pci_register_driver+0xb0/0xd0
> [17179593.936000]  [<eca3d020>] init+0x20/0x26 [ehci_hcd]
> [17179593.936000]  [<c0137e24>] sys_init_module+0x144/0x1c0
> [17179593.936000]  [<c01030ff>] sysenter_past_esp+0x54/0x75
> [17179593.936000] handlers:
> [17179593.936000] [<ec99bf20>] (usb_hcd_irq+0x0/0x70 [usbcore])
> [17179593.936000] Disabling IRQ #11
> [17179593.972000] ehci_hcd 0000:00:10.3: irq 11, io mem 0xd0004800
> [17179593.972000] ehci_hcd 0000:00:10.3: USB 2.0 initialized, EHCI 1.00, driver 10 Dec 2004
> [17179593.976000] hub 4-0:1.0: USB hub found
> [17179593.976000] hub 4-0:1.0: 6 ports detected
> 
>            CPU0
>   0:     245067          XT-PIC  timer
>   1:       2877          XT-PIC  i8042
>   2:          0          XT-PIC  cascade
>   4:      37766          XT-PIC  uhci_hcd:usb1, eth0, via@pci:0000:01:00.0
>   5:        296          XT-PIC  yenta, ohci1394, uhci_hcd:usb2
>   7:          2          XT-PIC  parport0
>   8:          2          XT-PIC  rtc
>   9:      51497          XT-PIC  uhci_hcd:usb3, VIA8233
>  10:          9          XT-PIC  acpi
>  11:     100000          XT-PIC  ehci_hcd:usb4
>  12:      86427          XT-PIC  i8042
>  14:      10409          XT-PIC  ide0
>  15:      19973          XT-PIC  ide1
> NMI:          0
> LOC:          0
> ERR:          0
> MIS:          0
> 
> any ideas? 

I suspect that interrupt happens before intr mast is written
ot corresponding register.

Add two printks, one before this writel:

printk("setting ehci->regs->intr_enable to %x\n", INTR_MASK);
        writel (INTR_MASK, &ehci->regs->intr_enable); /* Turn On Interrupts */

and one here:

        status &= INTR_MASK;
        if (!status) {                  /* irq sharing? */
static int ratelimit = 20;
if(ratelimit) ratelimit--, printk("ehci_irq: IRQ_NONE\n");
                spin_unlock(&ehci->lock);
                return IRQ_NONE;
        }

and see whether first printk happens before second.
--
vda
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