This is a note to let you know that I've just added the patch titled
cxl: Fix PSL timebase synchronization detection
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cxl-fix-psl-timebase-synchronization-detection.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 923adb1646d5ba739d2a1e63ee20d60574d9da8e Mon Sep 17 00:00:00 2001
From: Frederic Barrat <fbarrat@xxxxxxxxxxxxxxxxxx>
Date: Wed, 24 Feb 2016 18:27:51 +0100
Subject: cxl: Fix PSL timebase synchronization detection
From: Frederic Barrat <fbarrat@xxxxxxxxxxxxxxxxxx>
commit 923adb1646d5ba739d2a1e63ee20d60574d9da8e upstream.
The PSL timebase synchronization is seemingly failing for
configuration not including VIRT_CPU_ACCOUNTING_NATIVE. The driver
shows the following trace in dmesg:
PSL: Timebase sync: giving up!
The PSL timebase register is actually syncing correctly, but the cxl
driver is not detecting it. Fix is to use the proper timebase-to-time
conversion.
Signed-off-by: Frederic Barrat <fbarrat@xxxxxxxxxxxxxxxxxx>
Acked-by: Michael Neuling <mikey@xxxxxxxxxxx>
Reviewed-by: Matthew R. Ochs <mrochs@xxxxxxxxxxxxxxxxxx>
Acked-by: Ian Munsie <imunsie@xxxxxxxxxxx>
Reviewed-by: Andrew Donnellan <andrew.donnellan@xxxxxxxxxxx>
Reviewed-by: Vaibhav Jain <vaibhav@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/cxl/pci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -414,7 +414,7 @@ static int cxl_setup_psl_timebase(struct
delta = mftb() - psl_tb;
if (delta < 0)
delta = -delta;
- } while (cputime_to_usecs(delta) > 16);
+ } while (tb_to_ns(delta) > 16000);
return 0;
}
Patches currently in stable-queue which might be from fbarrat@xxxxxxxxxxxxxxxxxx are
queue-4.4/cxl-fix-psl-timebase-synchronization-detection.patch
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