* [PATCH] selftests/powerpc: Squash spurious errors due to device removal
@ 2020-07-27 1:01 Oliver O'Halloran
2020-07-30 12:50 ` Michael Ellerman
0 siblings, 1 reply; 2+ messages in thread
From: Oliver O'Halloran @ 2020-07-27 1:01 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Oliver O'Halloran
For drivers that don't have the error handling callbacks we implement
recovery by removing the device and re-probing it. This causes the sysfs
directory for the PCI device to be removed which causes the following
spurious error to be printed when checking the PE state:
Breaking 0005:03:00.0...
./eeh-basic.sh: line 13: can't open /sys/bus/pci/devices/0005:03:00.0/eeh_pe_state: no such file
0005:03:00.0, waited 0/60
0005:03:00.0, waited 1/60
0005:03:00.0, waited 2/60
0005:03:00.0, waited 3/60
0005:03:00.0, waited 4/60
0005:03:00.0, waited 5/60
0005:03:00.0, waited 6/60
0005:03:00.0, waited 7/60
0005:03:00.0, Recovered after 8 seconds
We currently try to avoid this by checking if the PE state file exists
before reading from it. This is however inherently racy so re-work the
state checking so that we only read from the file once, and we squash any
errors that occur while reading.
Fixes: 85d86c8aa52e ("selftests/powerpc: Add basic EEH selftest")
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
---
tools/testing/selftests/powerpc/eeh/eeh-functions.sh | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/powerpc/eeh/eeh-functions.sh b/tools/testing/selftests/powerpc/eeh/eeh-functions.sh
index f52ed92b53e7..00dc32c0ed75 100755
--- a/tools/testing/selftests/powerpc/eeh/eeh-functions.sh
+++ b/tools/testing/selftests/powerpc/eeh/eeh-functions.sh
@@ -5,12 +5,17 @@ pe_ok() {
local dev="$1"
local path="/sys/bus/pci/devices/$dev/eeh_pe_state"
- if ! [ -e "$path" ] ; then
+ # if a driver doesn't support the error handling callbacks then the
+ # device is recovered by removing and re-probing it. This causes the
+ # sysfs directory to disappear so read the PE state once and squash
+ # any potential error messages
+ local eeh_state="$(cat $path 2>/dev/null)"
+ if [ -z "$eeh_state" ]; then
return 1;
fi
- local fw_state="$(cut -d' ' -f1 < $path)"
- local sw_state="$(cut -d' ' -f2 < $path)"
+ local fw_state="$(echo $eeh_state | cut -d' ' -f1)"
+ local sw_state="$(echo $eeh_state | cut -d' ' -f2)"
# If EEH_PE_ISOLATED or EEH_PE_RECOVERING are set then the PE is in an
# error state or being recovered. Either way, not ok.
--
2.26.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] selftests/powerpc: Squash spurious errors due to device removal
2020-07-27 1:01 [PATCH] selftests/powerpc: Squash spurious errors due to device removal Oliver O'Halloran
@ 2020-07-30 12:50 ` Michael Ellerman
0 siblings, 0 replies; 2+ messages in thread
From: Michael Ellerman @ 2020-07-30 12:50 UTC (permalink / raw)
To: Oliver O'Halloran, linuxppc-dev
On Mon, 27 Jul 2020 11:01:27 +1000, Oliver O'Halloran wrote:
> For drivers that don't have the error handling callbacks we implement
> recovery by removing the device and re-probing it. This causes the sysfs
> directory for the PCI device to be removed which causes the following
> spurious error to be printed when checking the PE state:
>
> Breaking 0005:03:00.0...
> ./eeh-basic.sh: line 13: can't open /sys/bus/pci/devices/0005:03:00.0/eeh_pe_state: no such file
> 0005:03:00.0, waited 0/60
> 0005:03:00.0, waited 1/60
> 0005:03:00.0, waited 2/60
> 0005:03:00.0, waited 3/60
> 0005:03:00.0, waited 4/60
> 0005:03:00.0, waited 5/60
> 0005:03:00.0, waited 6/60
> 0005:03:00.0, waited 7/60
> 0005:03:00.0, Recovered after 8 seconds
>
> [...]
Applied to powerpc/next.
[1/1] selftests/powerpc: Squash spurious errors due to device removal
https://git.kernel.org/powerpc/c/5f8cf6475828b600ff6d000e580c961ac839cc61
cheers
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