On Sat, Oct 12, 2013 at 3:29 AM, Levente Kurusa <levex@xxxxxxxxx> wrote:
> 2013-10-12 04:06 keltezéssel, Robert Hancock írta:
>> On Fri, Oct 11, 2013 at 10:07 AM, Levente Kurusa <levex@xxxxxxxxx> wrote:
>>> 2013-10-01 06:25 keltezéssel, Robert Hancock írta:
>>>> On Sat, Sep 28, 2013 at 7:21 PM, Robert Hancock <hancockrwd@xxxxxxxxx> wrote:
>>>>> On Sat, Sep 28, 2013 at 11:46 AM, Levente Kurusa <levex@xxxxxxxxx> wrote:
>>>>>> 2013-09-28 06:55 keltezéssel, Robert Hancock írta:
>>>>>>
>>>>>>> On Fri, Sep 27, 2013 at 7:24 AM, Levente Kurusa <levex@xxxxxxxxx> wrote:
>>>>>>>>
>>>>>>>> 2013-09-25 08:31 keltezéssel, Robert Hancock írta:
>>>>>>>>
>>>>>>>>> On Sun, Sep 22, 2013 at 1:13 AM, Levente Kurusa <levex@xxxxxxxxx> wrote:
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> 2013-09-21 19:04 keltezéssel, Robert Hancock írta:
>>>>>>>>>>
>>>>>>>>>>> On Sat, Sep 21, 2013 at 1:35 AM, Levente Kurusa <levex@xxxxxxxxx>
>>>>>>>>>>> wrote:
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> The following dmesg is stuck in an infinite loop.
>>>>>>>>>>>>>>>>>> dmesg:
>>>>>>>>>>>>>>>>>> ata3: lost interrupt (Status 0x50)
>>>>>>>>>>>>>>>>>> ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
>>>>>>>>>>>>>>>>>> frozen
>>>>>>>>>>>>>>>>>> ata3.00: failed command: READ DMA
>>>>>>>>>>>>>>>>>> ata3.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 dma 4096
>>>>>>>>>>>>>>>>>> in
>>>>>>>>>>>>>>>>>> res 40/00:00:00:00:00/00:00:00:00:00/00
>>>>>>>>>>>>>>>>>> Emask
>>>>>>>>>>>>>>>>>> 0x4
>>>>>>>>>>>>>>>>>> (timeout)
>>>>>>>>>>>>>>>>>> ata3.00: status: { DRDY }
>>>>>>>>>>>>>>>>>> ata3: soft resetting link
>>>>>>>>>>>>>>>>>> ata3.00: configured for UDMA/33 (no error)
>>>>>>>>>>>>>>>>>> ata3.00: device reported invalid CHS sector 0
>>>>>>>>>>>>>>>>>> ata3: EH complete
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> Patch that fixes the infinite loop:
>>>>>>>>>>>>>>>>>> diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
>>>>>>>>>>>>>>>>>> index f9476fb..eeedf80 100644
>>>>>>>>>>>>>>>>>> --- a/drivers/ata/libata-eh.c
>>>>>>>>>>>>>>>>>> +++ b/drivers/ata/libata-eh.c
>>>>>>>>>>>>>>>>>> @@ -2437,6 +2437,14 @@ static void ata_eh_link_report(struct
>>>>>>>>>>>>>>>>>> ata_link
>>>>>>>>>>>>>>>>>> *link)
>>>>>>>>>>>>>>>>>> ehc->i.action, frozen,
>>>>>>>>>>>>>>>>>> tries_buf);
>>>>>>>>>>>>>>>>>> if (desc)
>>>>>>>>>>>>>>>>>> ata_dev_err(ehc->i.dev, "%s\n",
>>>>>>>>>>>>>>>>>> desc);
>>>>>>>>>>>>>>>>>> + ehc->i.dev->exce_cnt ++;
>>>>>>>>>>>>>>>>>> + ata_dev_warn(ehc->i.dev, "Number of exceptions:
>>>>>>>>>>>>>>>>>> %d\n",
>>>>>>>>>>>>>>>>>> ehc->i.dev->exce_cnt);
>>>>>>>>>>>>>>>>>> + /**
>>>>>>>>>>>>>>>>>> + * The device is failing terribly,
>>>>>>>>>>>>>>>>>> + * disable it to prevent damage.
>>>>>>>>>>>>>>>>>> + */
>>>>>>>>>>>>>>>>>> + if(ehc->i.dev->exce_cnt > 2)
>>>>>>>>>>>>>>>>>> + ata_dev_disable(ehc->i.dev);
>>>>>>>>>>>>>>>>>> } else {
>>>>>>>>>>>>>>>>>> ata_link_err(link, "exception Emask 0x%x
>>>>>>>>>>>>>>>>>> "
>>>>>>>>>>>>>>>>>> "SAct 0x%x SErr 0x%x action
>>>>>>>>>>>>>>>>>> 0x%x%s%s\n",
>>>>>>>>>>>>>>>>>> diff --git a/include/linux/libata.h b/include/linux/libata.h
>>>>>>>>>>>>>>>>>> index eae7a05..fa52ee6 100644
>>>>>>>>>>>>>>>>>> --- a/include/linux/libata.h
>>>>>>>>>>>>>>>>>> +++ b/include/linux/libata.h
>>>>>>>>>>>>>>>>>> @@ -660,7 +660,8 @@ struct ata_device {
>>>>>>>>>>>>>>>>>> u8
>>>>>>>>>>>>>>>>>> devslp_timing[ATA_LOG_DEVSLP_SIZE];
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>> /* error history */
>>>>>>>>>>>>>>>>>> - int spdn_cnt;
>>>>>>>>>>>>>>>>>> + int spdn_cnt; /* Number of
>>>>>>>>>>>>>>>>>> speed_downs
>>>>>>>>>>>>>>>>>> */
>>>>>>>>>>>>>>>>>> + int exce_cnt; /* Number of
>>>>>>>>>>>>>>>>>> exceptions
>>>>>>>>>>>>>>>>>> that
>>>>>>>>>>>>>>>>>> happenned */
>>>>>>>>>>>>>>>>>> /* ering is CLEAR_END, read comment above
>>>>>>>>>>>>>>>>>> CLEAR_END
>>>>>>>>>>>>>>>>>> */
>>>>>>>>>>>>>>>>>> struct ata_ering ering;
>>>>>>>>>>>>>>>>>> };
>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> This doesn't seem like a very good fix. It may prevent the
>>>>>>>>>>>>>>>>> apparent
>>>>>>>>>>>>>>>>> infinite loop but will just prevent that device from functioning
>>>>>>>>>>>>>>>>> at
>>>>>>>>>>>>>>>>> all.
>>>>>>>>>>>>>>>>> It would be better if we could figure out what was actually
>>>>>>>>>>>>>>>>> going
>>>>>>>>>>>>>>>>> wrong.
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> I have tested the problem with three different computers, all
>>>>>>>>>>>>>>>> switched
>>>>>>>>>>>>>>>> to legacy/IDE/compatibility mode, and they didn't have this
>>>>>>>>>>>>>>>> problem.
>>>>>>>>>>>>>>>> Of
>>>>>>>>>>>>>>>> course, they could have been set to AHCI mode, and there the
>>>>>>>>>>>>>>>> kernel
>>>>>>>>>>>>>>>> would
>>>>>>>>>>>>>>>> boot normally. Feels strange, but so far I was only able to
>>>>>>>>>>>>>>>> reproduce
>>>>>>>>>>>>>>>> the
>>>>>>>>>>>>>>>> problem with a Toshiba MK8052GSX. On the topic of my patch, I
>>>>>>>>>>>>>>>> still
>>>>>>>>>>>>>>>> don't
>>>>>>>>>>>>>>>> see why a device which fails so terribly that it reports 3
>>>>>>>>>>>>>>>> exceptions
>>>>>>>>>>>>>>>> shouldn't be disabled. Like in this case, it could cause infinite
>>>>>>>>>>>>>>>> loops.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> The problem is that this could happen in some cases when you
>>>>>>>>>>>>>>> wouldn't
>>>>>>>>>>>>>>> want to disable the device, like an error that just happens
>>>>>>>>>>>>>>> sporadically and works on retry, or a device you're trying to
>>>>>>>>>>>>>>> recover
>>>>>>>>>>>>>>> data from.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>> What do you think if I edit the patch in a way, that when an
>>>>>>>>>>>>>> operation
>>>>>>>>>>>>>> successfully completes, it resets exce_cnt to zero. Might as well
>>>>>>>>>>>>>> add
>>>>>>>>>>>>>> a
>>>>>>>>>>>>>> module_param, which can set the maximum value of exce_cnt, while
>>>>>>>>>>>>>> having
>>>>>>>>>>>>>> zero
>>>>>>>>>>>>>> as an option to never disable the device. Please don't think me
>>>>>>>>>>>>>> wrong,
>>>>>>>>>>>>>> I
>>>>>>>>>>>>>> don't want to force this patch, I just want to learn how all this
>>>>>>>>>>>>>> works,
>>>>>>>>>>>>>> and
>>>>>>>>>>>>>> in the process try to make it better. :-)
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> That would be better, but I think you're still going to have an
>>>>>>>>>>>>> issue
>>>>>>>>>>>>> with what magic number to pick to avoid disabling devices
>>>>>>>>>>>>> inappropriately.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Conceptually, disabling the device doesn't really make sense anyway.
>>>>>>>>>>>>> If someone in userspace wants to keep trying to read from that
>>>>>>>>>>>>> device,
>>>>>>>>>>>>> why would you stop them because of some arbitrary judgement? The
>>>>>>>>>>>>> kernel itself isn't "locked up" during this process, anything not
>>>>>>>>>>>>> blocked on I/O to that device should be able to continue running, so
>>>>>>>>>>>>> that process is only hurting itself. If the system fails to boot
>>>>>>>>>>>>> from
>>>>>>>>>>>>> another device due to this, this would likely point out some kind of
>>>>>>>>>>>>> problem in userspace or the distro boot process being overly
>>>>>>>>>>>>> serialized.
>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> I have been booting up with the initramfs from ubuntu 13.04,
>>>>>>>>>>>> and I have also tried to boot with the ubuntu install cd. They
>>>>>>>>>>>> couldn't
>>>>>>>>>>>> continue the boot process. I'm gonna spend the weekend trying to
>>>>>>>>>>>> figure
>>>>>>>>>>>> out where and why the interrupts don't happen. Whether it be a
>>>>>>>>>>>> routing
>>>>>>>>>>>> or a hardware issue, which I highly doubt due to the fact that
>>>>>>>>>>>> Windows
>>>>>>>>>>>> XP SP2 was able to boot up without errors.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Are you able to get out full dmesg output from a boot attempt and the
>>>>>>>>>>> contents of /proc/interrupts?
>>>>>>>>>>>
>>>>>>>>>> As I said before, I am not able to get to the shell, without my
>>>>>>>>>> 'symptom
>>>>>>>>>> cure'. With my patch I get the following dmesg output, with
>>>>>>>>>> some of my debug messages turned off:
>>>>>>>>>> http://pastebin.com/5eb5G3Dx
>>>>>>>>>> /proc/interrupts is here:
>>>>>>>>>> http://pastebin.com/84CJey2D
>>>>>>>>>> After yesterday's research, I have come to ata_piix.c . That file looks
>>>>>>>>>> like
>>>>>>>>>> the real culprit, as my netbook's controller is an Intel ICH7M one,
>>>>>>>>>> The values I am getting from the device are very different than those
>>>>>>>>>> that are expected.
>>>>>>>>>>
>>>>>>>>>> Things I have noticed, but ignored in dmesg:
>>>>>>>>>> There is a stack dump, because nobody cared about IRQ#20. I have
>>>>>>>>>> ignored
>>>>>>>>>> this because it is the EHCI IRQ, and I suppose it has nothing to do
>>>>>>>>>> with
>>>>>>>>>> ata. The problem is with ata3 or /dev/sdc, while the IRQ happens
>>>>>>>>>> with /dev/sda, which works fine.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> I think it is likely related to the problem. The kernel thinks this
>>>>>>>>> controller is on IRQ 16, but apparently something is raising
>>>>>>>>> un-acknowledged interrupts on IRQ 20 and nothing is coming in on IRQ
>>>>>>>>> 16. It seems quite likely that this is actually the ATA controller.
>>>>>>>>>
>>>>>>>>> You mentioned that Windows XP was able to work in this mode. I wonder
>>>>>>>>> if it was using the IOAPIC, as if not then the IRQ routing is
>>>>>>>>> different which might mask the problem. Do you know what IRQ Device
>>>>>>>>> Manager reported for this controller in Windows? And was it using any
>>>>>>>>> IRQs over 15 (which would indicate the IOAPIC was in use)?
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> Hmm, according to WinXP's Device manager for this controller,
>>>>>>>> it listens to IRQ# 20, and therefore it is using the I/O APIC.
>>>>>>>> Now, one question remains where is the error that mismaps
>>>>>>>> controller?
>>>>>>>> I have created a simple patch which seems to fix this:
>>>>>>>> ---
>>>>>>>> @@ -1704,6 +1767,8 @@ static int piix_init_one(struct pci_dev *pdev,
>>>>>>>> const
>>>>>>>> struct pci_device_id *ent)
>>>>>>>> hpriv->map = piix_init_sata_map(pdev, port_info,
>>>>>>>>
>>>>>>>> piix_map_db_table[ent->driver_data]);
>>>>>>>>
>>>>>>>> + if(pdev->vendor == 0x8086 && pdev->device == 0x27C4)
>>>>>>>> + pdev->irq = 20;
>>>>>>>> rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
>>>>>>>> if (rc)
>>>>>>>> return rc;
>>>>>>>>
>>>>>>>> However, I am more than sure that this is not the way
>>>>>>>> to solve this problem. Do you have any idea on where
>>>>>>>> the ideal place would be to implement a fix?
>>>>>>>> According to specs of ICH7M, which is essentially the
>>>>>>>> same as ICH6M, we need to check on what interrupt pin
>>>>>>>> is the SATA controller, and after that check which IRQ line
>>>>>>>> is connected to the I/O APIC and decide the IRQ's number
>>>>>>>> on those findings.
>>>>>>>>
>>>>>>>> Specs of ICH7:
>>>>>>>>
>>>>>>>> http://www.intel.com/content/dam/doc/datasheet/i-o-controller-hub-7-datasheet.pdf
>>>>>>>> Device 31 Interrupt Route Register: Chapter 7.1.46
>>>>>>>> Device 31 Interrupt Pin Register: Chapter 7.1.41
>>>>>>>>
>>>>>>>> The SATA controller is always Device 31.
>>>>>>>
>>>>>>>
>>>>>>> It would appear that something is messing up with the ACPI IRQ routing
>>>>>>> on this machine that's causing us to think the controller is on the
>>>>>>> wrong IRQ. CCing the linux-acpi list to see if anyone has some
>>>>>>> additional debugging suggestions. I suspect that dumping the DSDT is
>>>>>>> likely the first step though. If you can get IASL installed, you can
>>>>>>> do something like:
>>>>>>>
>>>>>>> cat /sys/firmware/acpi/tables/DSDT > dsdt.aml
>>>>>>> iasl -d dsdt.aml
>>>>>>>
>>>>>>> That should spit out a dsdt.dsl file which would hopefully have the
>>>>>>> info needed to figure out what's going on.
>>>>>>>
>>>>>>
>>>>>> Here is the disassembled DSDT table:
>>>>>> http://pastebin.com/LWNVht9H
>>>>>> The SATA controller is at line 5206.
>>>>>> I also disassembled the SSDT, but nothing interesting was there:
>>>>>> http://pastebin.com/fus5sxU8
>>>>>>
>>>>>> I disabled the usage of ACPI for IRQs with acpi=noirq,
>>>>>> and it successfully booted up setting itself to IRQ#3.
>>>>>> This makes me think that this is the BIOS's fault.
>>>>>> I think it would be possible to create a DMI check
>>>>>> and forcibly set the irq to 20 if the DMI matches.
>>>>>> Any comments on this?
>>>>>
>>>>> The BIOS may be doing something funky, but since Windows apparently
>>>>> can figure out it's on IRQ 20, Linux presumably should be able to as
>>>>> well. DMI checks should be the last resort - Windows almost certainly
>>>>> doesn't have any machine-specific logic here, and it's hard to tell
>>>>> what other machine models could be affected. With ACPI stuff, we
>>>>> generally just need to do the same thing Windows does for things to
>>>>> work reliably, and DMI checks are more of a hack workaround than a
>>>>> real fix.
>>>>>
>>>>> I'll try and have a look at the DSDT within the next few days and see
>>>>> if I can figure anything out, unless someone beats me to it.
>>>>
>>>> I haven't gone into too much detail, but one thing I noticed with the
>>>> DSDT is that there appear to be some _OSI checks for Windows 2006
>>>> (i.e. Vista) that seem to affect various things, including potentially
>>>> the PCI IRQ routing table. It's possible that their IRQ routing table
>>>> is broken for legacy mode with an ACPI OS supporting Vista (as current
>>>> Linux versions do). Could be this slipped through testing if they only
>>>> tested AHCI mode with Vista installed.
>>>>
>>>> You can try booting with the kernel parameters
>>>>
>>>> acpi_osi=! acpi_osi="Windows 2001 SP3"
>>>>
>>>> That should make the BIOS think we are Windows XP and bypass the Vista
>>>> code path. If that works, then you might want to check for a BIOS
>>>> update on this machine.
>>>>
>>>
>>> First of all, sorry for the late reply. I was kinda busy.
>>>
>>> I tried what you suggested but unfortunately the problem persists.
>>> This makes me believe that Windows XP does have somekind of DMI check here.
>>> Of course, while a BIOS update may solve this, I would prefer that Linux
>>> should also be able to boot up with this broken BIOS as well.
>>>
>>> If you are certain that WinXP doesn't use DMI checks,
>>> it could be that WinXP's driver of ICH7M's SATA controller applies
>>> a quirk and sets that irq line to #20.
>>
>> Can you post the dmesg output from a bootup attempt with those options?
>>
>> You may also want to try adding just: acpi_osi=!
>>
>
> None of the 3 possible combinations succeeded to boot.
>
> Here are a couple of dmesgs:
>
> Params: acpi_osi="Windows 2001 SP3"
> http://pastebin.com/vF3BSuhc
>
> Params: acpi_osi=! acpi_osi="Windows 2001 SP3"
> http://pastebin.com/BuUzc3es
>
> Params: acpi_osi=!
> http://pastebin.com/u7uRx8Ru
I'm not sure the option is actually taking effect properly. There
should be a message "Disabled all _OSI OS vendors" that shows up in
dmesg with the ! option. Can you try:
acpi_osi="!" acpi_osi="Windows 2001 SP3"
(with the quotes around the ! character).
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