On 10/16/2013 08:42 AM, Levente Kurusa wrote:
2013-10-16 02:16 keltezéssel, Robert Hancock írta:
On Sun, Oct 13, 2013 at 6:02 AM, Levente Kurusa <levex@xxxxxxxxx> wrote:
2013-10-13 07:57 keltezéssel, Robert Hancock írta:
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).
The following command line worked:
acpi_osi= acpi_osi="Windows 2001 SP3"
So, it seems that the BIOS is broken. Is there any way to fix this,
without resorting to the hackish DMI checks?
Probably not really. Have you checked for a newer BIOS version on this machine?
If not, this is likely similar to a number of other systems listed in
acpi_osi_dmi_table in drivers/acpi/blacklist.c which need to disable
reporting Vista support.
Yup, the attached patch fixed it.
I will post it a little bit later, mind if I add your signed-off-by line? :)
I would do a BIOS update and see if it was fixed there, but it seems that Toshiba's
BIOS updater and the BIOS itself causes more trouble than the problems fixed.
Sorry for the delay. Seems OK to me. When you submit the patch you
should include a link to this thread to the commit message, so someone
in the future would have a hope of knowing why this quirk is in here.
You can add my:
Reviewed-by: Robert Hancock <hancockrwd@xxxxxxxxx>
---
diff --git a/drivers/acpi/blacklist.c b/drivers/acpi/blacklist.c
index cb96296..34d4d1a 100644
--- a/drivers/acpi/blacklist.c
+++ b/drivers/acpi/blacklist.c
@@ -267,6 +267,14 @@ static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
DMI_MATCH(DMI_PRODUCT_NAME, "Satellite P305D"),
},
},
+ {
+ .callback = dmi_disable_osi_vista,
+ .ident = "Toshiba NB100",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "NB100"),
+ },
+ },
/*
* BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
--
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