Date:	Thu, 30 Dec 2010 21:17:04 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	Angelo Dureghello <angelo70@...il.com>
CC:	uClinux development list <uclinux-dev@...inux.org>,
	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 Anelo,

On 30/12/10 19:59, Angelo Dureghello wrote:
[snip]
> i phisically connected the HW interrupt pin of dm9000 to MCF5307 IRQ7
> pin (pin68). dm9000 is configured (through a resistor to3.3V on pin 57)
> not as default, but to act with HIGH to LOW interrupt edge, as MCF5307
> understand, and the interrupt line is pulled up to 3.3V to avoid
> flickering.
>
>
> PULL UP RES to 3.3V
>
> dm9000 | |
> IRQ |---------+-------------------| MCCF5307 PIN 68 (IRQ7)
>
>
> IRQ 7 is the "level 7" autovectored interrupt (vect 31 dec).
>
> Checking well the MCF5307 datasheet i have seen that "level 7" interrupt
> i casually choosed seems to be a special level:

Yes, IRQ7 is "special" on the 5307. It is non-maskable. So normal
linux locking will be broken if you use it in the normal way.


> /18.7.1 Level 7 Interrupts
> Level 7 interrupts are nonmaskable and are handled differently than
> other interrupts.
> Level 7 interrupts are edge triggered by a transition from a lower
> priority request to the
> level 7 request. Interrupts at all other levels are level sensitive.
> Therefore, if IRQ7 remains
> asserted, the MCF5307 recognizes only one level 7 interrupt because only
> one transition
> from a lower level request to a level 7 request occurred. For the
> processor to
> recognize two consecutive level 7 interrupts, one of the following must
> occur:
>
> 1) The interrupt request on the interrupt control pins is raised to
> level 7 and stays there
> until an interrupt-acknowledge cycle begins. The level later drops but
> then returns to
> level 7, causing a second transition on the interrupt control lines.
>
> 2) The interrupt request on the interrupt control pins is raised to
> level 7 and stays there.
> If the level 7 interrupt routine lowers the mask level, a second level 7
> interrupt is
> recognized without a transition of the interrupt control pins. After the
> level 7 routine
> completes, the MCF5307 compares the mask level to the request level on
> the IRQx
> signals. Because the mask level is lower than the requested level, the
> interrupt mask
> is set back to level 7. To ensure it is recognized, the level 7 request
> on IRQ7 must be
> held until the second interrupt-acknowledge bus cycle begins./
>
> I guess i can try to use another IRQ line, for example IRQ1 and see what
> happen. Let me know your thought and i can try right now to hw wire up
> the fix.

Yes, I suggest you try using another IRQ line. Stay away from IRQ7
for any normal devices.

Regards
Greg



> still many thanks,
>
> regards,
> angelo
>
>
> On 30/12/2010 01:37, Greg Ungerer wrote:
>> 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
>>>>> linux-kernel" in
>>>>> the body of a message to majordomo@...r.kernel.org
>>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>>>> Please read the FAQ at http://www.tux.org/lkml/
>>>>>
>>>>
>>>>
>>>
>>> _______________________________________________
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>>> http://mailman.uclinux.org/mailman/listinfo/uclinux-dev
>>> This message was resent by uclinux-dev@...inux.org
>>> To unsubscribe see:
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>>>
>>
>>
>
>
>


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