linux-kernel - [PATCH 3/3] cxl/mem: Demarcate vendor specific capability IDs

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Message-Id: <20210415232610.603273-3-ben.widawsky@intel.com>
Date:   Thu, 15 Apr 2021 16:26:10 -0700
From:   Ben Widawsky <ben.widawsky@...el.com>
To:     linux-cxl@...r.kernel.org
Cc:     Ben Widawsky <ben.widawsky@...el.com>, linux-pci@...r.kernel.org,
        linux-acpi@...r.kernel.org, ira.weiny@...el.com,
        vishal.l.verma@...el.com, alison.schofield@...el.com,
        dan.j.williams@...el.com, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] cxl/mem: Demarcate vendor specific capability IDs

Vendor capabilities occupy 0x8000 to 0xFFFF according to CXL 2.0 spec
8.2.8.2.1 CXL Device Capabilities. While they are not defined by the
spec, they are allowed and not "unknown". Call this detail out in the
logs to let users easily distinguish the difference.

Fixes: 8adaf747c9f0b ("cxl/mem: Find device capabilities")
Signed-off-by: Ben Widawsky <ben.widawsky@...el.com>
---
 drivers/cxl/mem.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
index c05617b0ba4b..0909f73db994 100644
--- a/drivers/cxl/mem.c
+++ b/drivers/cxl/mem.c
@@ -939,7 +939,10 @@ static int cxl_mem_setup_regs(struct cxl_mem *cxlm)
 			cxlm->memdev_regs = register_block;
 			break;
 		default:
-			dev_dbg(dev, "Unknown cap ID: %x (0x%x)\n", cap_id, offset);
+			if (cap_id > 0x8000)
+				dev_dbg(dev, "Vendor cap ID: %x (0x%x)\n", cap_id, offset);
+			else
+				dev_dbg(dev, "Unknown cap ID: %x (0x%x)\n", cap_id, offset);
 			break;
 		}
 	}
-- 
2.31.1