[Skiboot] [PATCH v3] xscom: Fix xscom error logging caused due to xscom OPAL call

[Gautham R. Shenoy]

From: "Gautham R. Shenoy" <ego at linux.vnet.ibm.com>

Commit 80fd2e963bd4 ("xscom: Don't log xscom errors caused by OPAL
calls") ensured that xscom errors caused due to XSCOM read/write OPAL
calls aren't logged in the error-log since the caller of the OPAL call
is expected to handle it.

However we are continuing to print the prerror() in the OPAL log
regarding the same. This patch reduces the severity of the log from
PR_ERROR to PR_INFO for the xscom read and write made via OPAL calls.

Tested-by: Pavaman Subramaniyam <pavsubra at in.ibm.com>
Signed-off-by: Gautham R. Shenoy <ego at linux.vnet.ibm.com>

Print info only for xscom read/writes made via opal calls

Signed-off-by: Gautham R. Shenoy <ego at linux.vnet.ibm.com>
---
 hw/xscom.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/hw/xscom.c b/hw/xscom.c
index 0eda567..c97740a 100644
--- a/hw/xscom.c
+++ b/hw/xscom.c
@@ -373,7 +373,16 @@ static int __xscom_read(uint32_t gcid, uint32_t pcb_addr, uint64_t *val)
 	if (proc_gen == proc_gen_p9 && ret == OPAL_XSCOM_CHIPLET_OFF)
 		return ret;
 
-	prerror("XSCOM: Read failed, ret =  %lld\n", ret);
+	/*
+	 * If an OPAL call XSCOM read fails, then the OPAL-PRD will
+	 * handle logging the error.  Hence just print an
+	 * informational message here.
+	 */
+	if (this_cpu()->current_token == OPAL_XSCOM_READ)
+		prlog(PR_INFO, "XSCOM: Read failed, ret =  %lld\n", ret);
+	else
+		prerror("XSCOM: Read failed, ret =  %lld\n", ret);
+
 	return ret;
 }
 
@@ -424,8 +433,16 @@ static int __xscom_write(uint32_t gcid, uint32_t pcb_addr, uint64_t val)
 	 */
 	if (proc_gen == proc_gen_p9 && ret == OPAL_XSCOM_CHIPLET_OFF)
 		return ret;
+	/*
+	 * If an OPAL call XSCOM write fails, then the OPAL-PRD will
+	 * handle logging the error.  Hence just print an
+	 * informational message here.
+	 */
+	if (this_cpu()->current_token == OPAL_XSCOM_WRITE)
+		prlog(PR_INFO, "XSCOM: Write failed, ret =  %lld\n", ret);
+	else
+		prerror("XSCOM: Write failed, ret =  %lld\n", ret);
 
-	prerror("XSCOM: Write failed, ret =  %lld\n", ret);
 	return ret;
 }
 
-- 
1.9.4