[PATCH 4/5] cxl/mbox: Use new return_code handling

[Davidlohr Bueso <dave@stgolabs.net>]

Use the global cxl_mbox_cmd_rc table to improve debug messaging
in __cxl_pci_mbox_send_cmd() and allow cxl_mbox_send_cmd()
to map to proper kernel style errno codes - this patch
continues to use -ENXIO only so no change in semantics.

Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
---
 drivers/cxl/core/mbox.c | 7 ++++---
 drivers/cxl/pci.c       | 3 ++-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index d4d4a16820b7..fa9e7043f158 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -170,9 +170,10 @@ int cxl_mbox_send_cmd(struct cxl_dev_state *cxlds, u16 opcode, void *in,
 	if (rc)
 		return rc;
 
-	/* TODO: Map return code to proper kernel style errno */
-	if (mbox_cmd.return_code != CXL_MBOX_CMD_RC_SUCCESS)
-		return -ENXIO;
+	if (mbox_cmd.return_code != CXL_MBOX_CMD_RC_SUCCESS) {
+		int err = cxl_mbox_cmd_rc2errno(&mbox_cmd);
+		return -err;
+	}
 
 	/*
 	 * Variable sized commands can't be validated and so it's up to the
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index 0c36d111232b..67ec0220826f 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -178,7 +178,8 @@ static int __cxl_pci_mbox_send_cmd(struct cxl_dev_state *cxlds,
 		FIELD_GET(CXLDEV_MBOX_STATUS_RET_CODE_MASK, status_reg);
 
 	if (mbox_cmd->return_code != CXL_MBOX_CMD_RC_SUCCESS) {
-		dev_dbg(dev, "Mailbox operation had an error\n");
+		dev_dbg(dev, "Mailbox operation had an error: %s\n",
+			cxl_mbox_cmd_rc2str(mbox_cmd));
 		return 0;  /* completed but caller must check return_code */
 	}
 
-- 
2.26.2