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Date:   Sat, 31 Oct 2020 12:35:33 +0100
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Frederic Barrat <>,
        Andrew Donnellan <>,
        Michael Ellerman <>
Subject: [PATCH 5.4 37/49] cxl: Rework error message for incompatible slots

From: Frederic Barrat <>

commit 40ac790d99c6dd16b367d5c2339e446a5f1b0593 upstream.

Improve the error message shown if a capi adapter is plugged on a
capi-incompatible slot directly under the PHB (no intermediate switch).

Fixes: 5632874311db ("cxl: Add support for POWER9 DD2")
Cc: # 4.14+
Signed-off-by: Frederic Barrat <>
Reviewed-by: Andrew Donnellan <>
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
@@ -393,8 +393,8 @@ int cxl_calc_capp_routing(struct pci_dev
 	*capp_unit_id = get_capp_unit_id(np, *phb_index);
 	if (!*capp_unit_id) {
-		pr_err("cxl: invalid capp unit id (phb_index: %d)\n",
-		       *phb_index);
+		pr_err("cxl: No capp unit found for PHB[%lld,%d]. Make sure the adapter is on a capi-compatible slot\n",
+		       *chipid, *phb_index);
 		return -ENODEV;

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