Date:	Thu, 30 Dec 2010 10:37:53 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	uClinux development list <uclinux-dev@...inux.org>
CC:	Angelo Dureghello <angelo70@...il.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	<netdev@...r.kernel.org>, Baruch Siach <baruch@...s.co.il>,
	<linux-kernel@...r.kernel.org>, <linux-m68k@...r.kernel.org>
Subject: Re: [uClinux-dev] Re: dm9000 patch

Hi Angelo,

On 30/12/10 06:57, Angelo Dureghello wrote:
> Hi all,
> thanks for the help,
> the kernel is a main line kernel. Then yes, i am still using uclinux
> tree for libc/tools.

How is the DM9000 hardware connected to the 5307?
I am wondering how you connected the interrupt (and to
which interrupt) and the addressing (direct of a chip select)?

(For example NETtel based 5307 platform support of the SMC91x code is
in mainline as arch/m68knommu/platform/5307/nettel.c). Can you show
the code you used to setup your dm9000 hardware?
(Specifically I guess I want to know if you use the "auto-vectored"
interrupt mode?)

Thanks
Greg


> I collected another spinlock recursion with a slightly different call
> stack trace, as always, the spinlock recursion issue happen on a high
> tx/rx traffic of the dm9000e, in this case just asking an index.html
> with some images and texts:
>
> [ 1108.930000] BUG: spinlock recursion on CPU#0, httpd/29
> [ 1108.930000] lock: 00c42c06, .magic: dead4ead, .owner: httpd/29,
> .owner_cpu: 0
> [ 1108.930000] Stack from 00d7a688:
> [ 1108.930000] 00d7a6b4 000ad988 001840ca 00c42c06 dead4ead 00d641d4
> 0000001d 00000000
> [ 1108.930000] 00c42c06 000064f0 00c42800 00d7a6e8 000adb5a 00c42c06
> 00184130 00002704
> [ 1108.930000] 00000000 0000001f 0014d17e 00159912 00c42b60 000064f0
> 00c42800 0002cb16
> [ 1108.930000] 00d7a6f8 0014d24e 00c42c06 00000000 00d7a738 000e485c
> 00c42c06 00000000
> [ 1108.930000] 00000000 0000001f 0014d17e 00159912 0000004a 00cfc600
> 000064f0 00009a74
> [ 1108.930000] 0002cb16 00191204 00d7a760 0002b6f2 00d7a760 0002b514
> 0000001f 00c42800
> [ 1108.930000] Call Trace:
> [ 1108.930000] [000ad988] spin_bug+0x86/0x11a
> [ 1108.930000] [000adb5a] do_raw_spin_lock+0x58/0x120
> [ 1108.930000] [0014d24e] _raw_spin_lock_irqsave+0x28/0x32
> [ 1108.930000] [000e485c] dm9000_interrupt+0x1a/0x2e0
> [ 1108.930000] [0002b514] handle_IRQ_event+0x2a/0xec
> [ 1108.930000] [0002b680] __do_IRQ+0xaa/0x128
> [ 1108.930000] [00000bb6] do_IRQ+0x48/0x62
> [ 1108.930000] [000033c6] inthandler+0x6a/0x74
> [ 1108.930000] [000fb626] dev_hard_start_xmit+0x170/0x4c4
> [ 1108.930000] [0010b80e] sch_direct_xmit+0xc0/0x1bc
> [ 1108.930000] [000fe9de] dev_queue_xmit+0x160/0x3e6
> [ 1108.930000] [001195c4] ip_finish_output+0xec/0x320
> [ 1108.930000] [0011a768] ip_output+0x9e/0xa8
> [ 1108.930000] [00119856] ip_local_out+0x26/0x30
> [ 1108.930000] [0011a56e] ip_build_and_send_pkt+0x16e/0x178
> [ 1108.930000] [0012fc96] tcp_v4_send_synack+0x52/0x90
> [ 1108.930000] [00130f86] tcp_v4_conn_request+0x3fa/0x57c
> [ 1108.930000] [0012a1c6] tcp_rcv_state_process+0x25e/0xa66
> [ 1108.930000] [001309a4] tcp_v4_do_rcv+0x7c/0x1c8
> [ 1108.930000] [00132854] tcp_v4_rcv+0x546/0x6d2
> [ 1108.930000] [001153a8] ip_local_deliver+0x9c/0x1b0
> [ 1108.930000] [001158e8] ip_rcv+0x42c/0x5f0
> [ 1108.930000] [000fa74e] __netif_receive_skb+0x196/0x2ec
> [ 1108.930000] [000fe142] process_backlog+0x72/0x11e
> [ 1108.930000] [000fe290] net_rx_action+0xa2/0x150
> [ 1108.930000] [0000e13c] __do_softirq+0x74/0xe4
> [ 1108.930000] [0000e1e2] do_softirq+0x36/0x40
> [ 1108.930000] [0000e6c6] local_bh_enable+0x7a/0xa4
> [ 1108.930000] [000fe972] dev_queue_xmit+0xf4/0x3e6
> [ 1108.930000] [001195c4] ip_finish_output+0xec/0x320
> [ 1108.930000] [0011a768] ip_output+0x9e/0xa8
> [ 1108.930000] [00119856] ip_local_out+0x26/0x30
> [ 1108.930000] [0011a90a] ip_queue_xmit+0x198/0x426
> [ 1108.930000] [0012bcc8] tcp_transmit_skb+0x3f0/0x76c
> [ 1108.930000] [0012cfda] tcp_write_xmit+0x178/0x868
> [ 1108.930000] [0012d6f8] __tcp_push_pending_frames+0x2e/0x9a
> [ 1108.930000] [001222be] tcp_sendmsg+0x82e/0x98c
> [ 1108.930000] [0013d9c0] inet_sendmsg+0x32/0x54
> [ 1108.930000] [000ec25e] sock_aio_write+0xc8/0x138
> [ 1108.930000] [00043e7e] do_sync_write+0x9e/0xfe
> [ 1108.930000] [00043f56] vfs_write+0x78/0x84
> [ 1108.930000] [0004446c] sys_write+0x40/0x7a
> [ 1108.930000] [00003244] system_call+0x84/0xc2
> [ 1108.930000]
>
> seems like while i transmit a packet, dm9000_interrupt try to acquire
> the spinlock owned from the same task.
>
> Compiling the kernel i am getting:
> CC kernel/irq/handle.o
> kernel/irq/handle.c:432:3: warning: #warning __do_IRQ is deprecated.
> Please convert to proper flow handlers
>
> Could the usage of __do_IRQ super-handler be a cause of the issue ?
>
>
> many thanks,
> angelo
>
> On 29/12/2010 19:45, Geert Uytterhoeven wrote:
>> On Wed, Dec 29, 2010 at 19:06, Baruch Siach<baruch@...s.co.il> wrote:
>>> Hi Angelo,
>>>
>>> On Wed, Dec 29, 2010 at 02:13:22PM +0100, Angelo Dureghello wrote:
>>>> just FYI, i tested kernel 2.6.36.2, unfortunately the issue is still
>>>> there, below the call stack trace.
>>> Help from the m68k experts seems to be needed. Adding the relevant
>>> list to Cc.
>> This is uClinux? Added Cc...
>>
>>>> [ 4.620000] eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
>>>> [ 39.390000] BUG: spinlock recursion on CPU#0, httpd/29
>>>> [ 39.390000] lock: 00189c44, .magic: dead4ead, .owner: httpd/29,
>>>> .owner_cpu: 0
>>>> [ 39.390000] Stack from 00d6a990:
>>>> [ 39.390000] 00d6a9bc 000a9710 0017cac7 00189c44 dead4ead
>>>> 00de48f4 0000001d 00000000
>>>> [ 39.390000] 00189c44 0002a646 00145f70 00d6a9f0 000a98e2
>>>> 00189c44 0017cb2d 00189c44
>>>> [ 39.390000] 00d6aad8 0000001f 00145f5c 001523f6 00189c08
>>>> 0002a646 00145f70 0002bc52
>>>> [ 39.390000] 00d6a9fc 00145f7e 00189c44 00d6aa28 0002a75e
>>>> 00189c44 0000001f 00d6aad8
>>>> [ 39.390000] 0000001f 00145f5c 00189c08 0002a646 00145f70
>>>> 0002bc52 00d6aa3c 00000bb6
>>>> [ 39.390000] 0000001f 00189c44 00cfc780 00d6aa84 0000337a
>>>> 0000001f 00d6aa4c 00000001
>>>> [ 39.390000] Call Trace:
>>>> [ 39.390000] [000a9710] spin_bug+0x86/0x11a
>>>> [ 39.390000] [000a98e2] do_raw_spin_lock+0x58/0x120
>>>> [ 39.390000] [00145f7e] _raw_spin_lock+0xe/0x14
>>>> [ 39.390000] [0002a75e] __do_IRQ+0x2c/0x108
>>>> [ 39.390000] [00000bb6] do_IRQ+0x48/0x62
>>>> [ 39.390000] [0000337a] inthandler+0x6a/0x74
>>>> [ 39.390000] [0002a82e] __do_IRQ+0xfc/0x108
>>>> [ 39.390000] [00000bb6] do_IRQ+0x48/0x62
>>>> [ 39.390000] [0000337a] inthandler+0x6a/0x74
>>>> [ 39.390000] [000ef0ce] skb_release_all+0x10/0x20
>>>> [ 39.390000] [000ee6bc] __kfree_skb+0x10/0x92
>>>> [ 39.390000] [000ee75e] consume_skb+0x20/0x34
>>>> [ 39.390000] [000e004e] dm9000_start_xmit+0xdc/0xec
>>>> [ 39.390000] [000f67a2] dev_hard_start_xmit+0x146/0x472
>>>> [ 39.390000] [00106506] sch_direct_xmit+0xc0/0x1bc
>>>> [ 39.390000] [000f9914] dev_queue_xmit+0x160/0x3e4
>>>> [ 39.390000] [00113b3e] ip_finish_output+0xee/0x318
>>>> [ 39.390000] [001142b4] ip_output+0x7c/0x88
>>>> [ 39.390000] [00113dc6] ip_local_out+0x26/0x30
>>>> [ 39.390000] [00114d9a] ip_queue_xmit+0x152/0x374
>>>> [ 39.390000] [00125c8c] tcp_transmit_skb+0x3f0/0x732
>>>> [ 39.390000] [00126f26] tcp_write_xmit+0x178/0x868
>>>> [ 39.390000] [00127644] __tcp_push_pending_frames+0x2e/0x9a
>>>> [ 39.390000] [0011c3d6] tcp_sendmsg+0x82e/0x98c
>>>> [ 39.390000] [00137544] inet_sendmsg+0x32/0x54
>>>> [ 39.390000] [000e79a6] sock_aio_write+0xc8/0x138
>>>> [ 39.390000] [00042590] do_sync_write+0x9e/0xfe
>>>> [ 39.390000] [00042668] vfs_write+0x78/0x84
>>>> [ 39.390000] [00042a92] sys_write+0x40/0x7a
>>>> [ 39.390000] [00003224] system_call+0x84/0xc2
>>>> [ 39.390000]
>>>>
>>>> dm9000e is as default not visible/selectable in menuconfig for
>>>> Coldfire architectures, so this probably cannot be considered as a
>>>> kernel bug.
>>>>
>>>> I going forward in investigations, every help is appreciated,
>>>>
>>>> regards,
>>>> angelo
>>>>
>>>>
>>>>
>>>> On 29/12/2010 07:06, Baruch Siach wrote:
>>>>> Hi Angelo,
>>>>>
>>>>> On Tue, Dec 28, 2010 at 10:52:42PM +0100, Angelo Dureghello wrote:
>>>>>> sorry to contact you directly but i couldn't get any help from the
>>>>>> kernel.org mailing list, since i am not a developer my mails are
>>>>>> generally skipped.
>>>>> The best way to get the contact info for a piece of kernel code, is
>>>>> using the
>>>>> get_maintainer.pl script. Running 'scripts/get_maintainer.pl -f
>>>>> drivers/net/dm9000.c' gives the following output:
>>>>>
>>>>> netdev@...r.kernel.org
>>>>> linux-kernel@...r.kernel.org
>>>>>
>>>>> I added both to Cc.
>>>>>
>>>>>> I am very near to have a custom board working with MCF5307 cpu and
>>>>>> dm9000.
>>>>>> I am using kernel 2.6.36-rc3 with your last patch about
>>>>>> spinlock-recursion already included.
>>>>> You should try to update to the latest .36 kernel, which is currently
>>>>> 2.6.36.2. The problem that you experience might be unrelated to the
>>>>> dm9000
>>>>> driver (or to networking at all), so it might have been fixed in
>>>>> this version.
>>>>>
>>>>>> I have "ping" and "telnet" to the embedded board fully working.
>>>>>> If i try to get a sample web page with some images from the board
>>>>>> httpd with a browser, in 80% of cases i get a trap/oops:
>>>>> Try to enable KALLSYMS in your kernel .config to make your stack
>>>>> trace more
>>>>> meaningful. This is under 'General setup -> Configure standard
>>>>> kernel features
>>>>> (for small systems) -> Load all symbols for debugging/ksymoops'.
>>>>>
>>>>> I hope this helps.
>>>>>
>>>>> baruch
>>>>>
>>>>>> [ 4.590000] eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
>>>>>> [ 67.630000] BUG: spinlock recursion on CPU#0, httpd/29
>>>>>> [ 67.630000] lock: 00c42c06, .magic: dead4ead, .owner: httpd/29,
>>>>>> .owner_cpu: 0
>>>>>> [ 67.630000] Stack from 00d7b914:
>>>>>> [ 67.630000] 00d7b940 000a8cf0 0015f693 00c42c06 dead4ead
>>>>>> 00dec1d4 0000001d 00000000
>>>>>> [ 67.630000] 00c42c06 00006188 00c42800 00d7b974 000a8ec2
>>>>>> 00c42c06 0015f6f9 00002704
>>>>>> [ 67.630000] 00000000 0000001f 00146fa4 00152f0c 00c42b60
>>>>>> 00006188 00c42800 0002b312
>>>>>> [ 67.630000] 00d7b984 0014701e 00c42c06 00000000 00d7b9c4
>>>>>> 000df21c 00c42c06 00000000
>>>>>> [ 67.630000] 00000000 0000001f 00146fa4 00152f0c 000005ea
>>>>>> 00cfc640 00006188 000096e8
>>>>>> [ 67.630000] 0002b312 00146fa4 00c42b60 00002704 00d7b9ec
>>>>>> 00029d3a 0000001f 00c42800
>>>>>> [ 67.630000] Call Trace:
>>>>>> [ 67.630000] [000a8cf0] [000a8ec2] [0014701e] [000df21c] [00029d3a]
>>>>>> [ 67.630000] [00029e84] [00000bb6] [0000336e] [000df162] [000effd6]
>>>>>> [ 67.630000] [00100482] [000f312e] [000f9ebc] [0010dd2a] [0010e4a0]
>>>>>> [ 67.630000] [0010dfb2] [0010ef80] [0011fed6] [00121170] [0012188e]
>>>>>> [ 67.630000] [0011ecc6] [001249fe] [000e4084] [0011621c] [00131a44]
>>>>>> [ 67.630000] [000e11ee] [00041944] [00041a1c] [00041e46] [00003218]
>>>>>> [ 67.630000] BUG: spinlock lockup on CPU#0, httpd/29, 00c42c06
>>>>>> [ 67.630000] Stack from 00d7b934:
>>>>>> [ 67.630000] 00d7b974 000a8f66 0015f703 00000000 00dec1d4
>>>>>> 0000001d 00c42c06 00002704
>>>>>> [ 67.630000] 00000000 0000001f 00146fa4 00152f0c 00c42b60
>>>>>> 00006188 00c42800 0002b312
>>>>>> [ 67.630000] 00d7b984 0014701e 00c42c06 00000000 00d7b9c4
>>>>>> 000df21c 00c42c06 00000000
>>>>>> [ 67.630000] 00000000 0000001f 00146fa4 00152f0c 000005ea
>>>>>> 00cfc640 00006188 000096e8
>>>>>> [ 67.630000] 0002b312 00146fa4 00c42b60 00002704 00d7b9ec
>>>>>> 00029d3a 0000001f 00c42800
>>>>>> [ 67.630000] 0016c1b4 00cfc640 0000001f 0016c178 00029d10
>>>>>> 00146fb8 00d7ba20 00029e84
>>>>>> [ 67.630000] Call Trace:
>>>>>> [ 67.630000] [000a8f66] [0014701e] [000df21c] [00029d3a] [00029e84]
>>>>>> [ 67.630000] [00000bb6] [0000336e] [000df162] [000effd6] [00100482]
>>>>>> [ 67.630000] [000f312e] [000f9ebc] [0010dd2a] [0010e4a0] [0010dfb2]
>>>>>> [ 67.630000] [0010ef80] [0011fed6] [00121170] [0012188e] [0011ecc6]
>>>>>> [ 67.630000] [001249fe] [000e4084] [0011621c] [00131a44] [000e11ee]
>>>>>> [ 67.630000] [00041944] [00041a1c] [00041e46] [00003218]
>>>>>>
>>>>>> As i said, i was hoping in your patch but i sadly discovered it is
>>>>>> already included in this kernel version.
>>>>>> Hope you can give me some help or can forward me to an appropriate
>>>>>> mailing list.
>>> --
>>> ~. .~ Tk Open Systems
>>> =}------------------------------------------------ooO--U--Ooo------------{=
>>>
>>> - baruch@...s.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe
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>>> Please read the FAQ at http://www.tux.org/lkml/
>>>
>>
>>
>
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