NIC irq nobody cared ? virtual to physical and DMA questions

NIC irq nobody cared ? virtual to physical and DMA questions

[Mateusz Berezecki]

Hello List,

This time the questions are different.

Given the following output could anyone please tell me what is wrong ?
In explicit what does that mysterious "nobody cared" message mean?
And another stupid question: should DMA for a network card be enabled before or maybe
_after_ interrupts get enabled? And... how to convert virtual address
to physical one?

Nov 29 21:25:47 debian kernel: atheros: receive init routine called
Nov 29 21:25:47 debian kernel: atheros: physical address of RX head is 00000000
Nov 29 21:25:47 debian kernel: atheros: enabling DMA receive. this can crash things supposedly.
Nov 29 21:25:47 debian kernel: irq 11: nobody cared (try booting with the "irqpoll" option)
Nov 29 21:25:47 debian kernel:  [dump_stack+23/32] dump_stack+0x17/0x20
Nov 29 21:25:47 debian kernel:  [__report_bad_irq+39/144] __report_bad_irq+0x27/0x90
Nov 29 21:25:47 debian kernel:  [note_interrupt+114/192] note_interrupt+0x72/0xc0
Nov 29 21:25:47 debian kernel:  [__do_IRQ+200/224] __do_IRQ+0xc8/0xe0
Nov 29 21:25:47 debian kernel:  [do_IRQ+80/128] do_IRQ+0x50/0x80
Nov 29 21:25:47 debian kernel:  =======================
Nov 29 21:25:47 debian kernel:  [common_interrupt+26/32] common_interrupt+0x1a/0x20
Nov 29 21:25:47 debian kernel:  [do_softirq+115/128] do_softirq+0x73/0x80
Nov 29 21:25:47 debian kernel:  =======================
Nov 29 21:25:47 debian kernel:  [irq_exit+67/80] irq_exit+0x43/0x50
Nov 29 21:25:47 debian kernel:  [do_IRQ+87/128] do_IRQ+0x57/0x80
Nov 29 21:25:47 debian kernel:  [common_interrupt+26/32] common_interrupt+0x1a/0x20
Nov 29 21:25:47 debian kernel:  [pg0+260065664/1065075712] ath_init+0x30/0x80 [atheros]
Nov 29 21:25:47 debian kernel:  [dev_open+70/144] dev_open+0x46/0x90
Nov 29 21:25:47 debian kernel:  [dev_change_flags+83/288] dev_change_flags+0x53/0x120
Nov 29 21:25:47 debian kernel:  [devinet_ioctl+1437/1472] devinet_ioctl+0x59d/0x5c0
Nov 29 21:25:47 debian kernel:  [inet_ioctl+166/208] inet_ioctl+0xa6/0xd0
Nov 29 21:25:47 debian kernel:  [sock_ioctl+248/592] sock_ioctl+0xf8/0x250
Nov 29 21:25:47 debian kernel:  [do_ioctl+40/144] do_ioctl+0x28/0x90
Nov 29 21:25:47 debian kernel:  [vfs_ioctl+87/496] vfs_ioctl+0x57/0x1f0
Nov 29 21:25:47 debian kernel:  [sys_ioctl+57/96] sys_ioctl+0x39/0x60
Nov 29 21:25:47 debian kernel:  [syscall_call+7/11] syscall_call+0x7/0xb
Nov 29 21:25:47 debian kernel: handlers:
Nov 29 21:25:47 debian kernel: [usb_hcd_irq+0/80] (usb_hcd_irq+0x0/0x50)
Nov 29 21:25:47 debian last message repeated 3 times
Nov 29 21:25:47 debian kernel: [yenta_interrupt+0/192] (yenta_interrupt+0x0/0xc0)
Nov 29 21:25:47 debian kernel: [pg0+260075488/1065075712] (ath_intr+0x0/0x150 [atheros])
Nov 29 21:25:47 debian kernel: Disabling IRQ #11
Nov 29 21:25:47 debian kernel: atheros: interrupts enabled
Nov 29 21:25:47 debian kernel: atheros: device up and running

-- 
kind regards,
 Mateusz Berezecki

Re: NIC irq nobody cared ? virtual to physical and DMA questions

[Ivo van Doorn]

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Hi,

> This time the questions are different.
> 
> Given the following output could anyone please tell me what is wrong ?
> In explicit what does that mysterious "nobody cared" message mean?
> And another stupid question: should DMA for a network card be enabled before or maybe
> _after_ interrupts get enabled? And... how to convert virtual address
> to physical one?

The nobody cared error message is reported when a device is raising interrupts while
the actual driver has not yet registered the interrupt handler.

The best way to handle this for network drivers (done in rt2x00, which works fine) would be:

1 - Allocate DMA
2 - Registers interrupt handler
3 - Enable device interrupts.

IvD

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