linux-kernel - [PATCH 5.9 62/74] cxl: Rework error message for incompatible slots

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Date:   Sat, 31 Oct 2020 12:36:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 5.9 62/74] cxl: Rework error message for incompatible slots

From: Frederic Barrat <fbarrat@...ux.ibm.com>

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: stable@...r.kernel.org # 4.14+
Signed-off-by: Frederic Barrat <fbarrat@...ux.ibm.com>
Reviewed-by: Andrew Donnellan <ajd@...ux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20200407115601.25453-1-fbarrat@linux.ibm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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);
 	of_node_put(np);
 	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;
 	}