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Subject[PATCH 4.17 059/220] cxl: Configure PSL to not use APC virtual machines
4.17-stable review patch.  If anyone has any objections, please let me know.


From: Vaibhav Jain <>

commit 9a6d2022bacd8fca0be6297459a02dfd28dad6ba upstream.

APC virtual machines arent used on POWER-9 chips and are already
disabled in on-chip CAPP. They also need to be disabled on the PSL via
'PSL Data Send Control Register' by setting bit(47). This forces the
PSL to send commands to CAPP with == 0.

Fixes: 5632874311db ("cxl: Add support for POWER9 DD2")
Cc: # v4.15+
Signed-off-by: Vaibhav Jain <>
Acked-by: Andrew Donnellan <>
Reviewed-by: Alastair D'Silva <>
Reviewed-by: Christophe Lombard <>
Signed-off-by: Michael Ellerman <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/misc/cxl/pci.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -514,9 +514,9 @@ static int init_implementation_adapter_r
cxl_p1_write(adapter, CXL_PSL9_FIR_CNTL, psl_fircntl);

/* Setup the PSL to transmit packets on the PCIe before the
- * CAPP is enabled
+ * CAPP is enabled. Make sure that CAPP virtual machines are disabled
- cxl_p1_write(adapter, CXL_PSL9_DSNDCTL, 0x0001001000002A10ULL);
+ cxl_p1_write(adapter, CXL_PSL9_DSNDCTL, 0x0001001000012A10ULL);

* A response to an ASB_Notify request is returned by the

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