From: Nathan Lynch <nath...@linux.ibm.com>
Not all of the generic RTAS function statuses specified in PAPR have
symbolic constants and descriptions in rtas.h. Fix this, providing a
little more background, slightly updating the existing wording, and
improving the formatting.
Signed-off-by: Nathan Lynch <nath...@linux.ibm.com>
---
arch/powerpc/include/asm/rtas.h | 25 +++++++++++++++++++------
1 file changed, 19 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h
index c697c3c74694..b73010583a8d 100644
--- a/arch/powerpc/include/asm/rtas.h
+++ b/arch/powerpc/include/asm/rtas.h
@@ -201,12 +201,25 @@ typedef struct {
/* Memory set aside for sys_rtas to use with calls that need a work area. */
#define RTAS_USER_REGION_SIZE (64 * 1024)
-/* RTAS return status codes */
-#define RTAS_HARDWARE_ERROR -1 /* Hardware Error */
-#define RTAS_BUSY -2 /* RTAS Busy */
-#define RTAS_INVALID_PARAMETER -3 /* Invalid indicator/domain/sensor etc. */
-#define RTAS_EXTENDED_DELAY_MIN 9900
-#define RTAS_EXTENDED_DELAY_MAX 9905
+/*
+ * Common RTAS function return values, derived from the table "RTAS
+ * Status Word Values" in PAPR+ 7.2.8: "Return Codes". If a function
+ * can return a value in this table then generally it has the meaning
+ * listed here. More extended commentary in the documentation for
+ * rtas_call().
+ *
+ * RTAS functions may use negative and positive numbers not in this
+ * set for function-specific error and success conditions,
+ * respectively.
+ */
+#define RTAS_SUCCESS 0 /* Success. */
+#define RTAS_HARDWARE_ERROR -1 /* Hardware or other unspecified
error. */
+#define RTAS_BUSY -2 /* Retry immediately. */
+#define RTAS_INVALID_PARAMETER -3 /* Invalid indicator/domain/sensor
etc. */
+#define RTAS_UNEXPECTED_STATE_CHANGE -7 /* Seems limited to EEH and slot
reset. */
+#define RTAS_EXTENDED_DELAY_MIN 9900 /* Retry after delaying for ~1ms. */
+#define RTAS_EXTENDED_DELAY_MAX 9905 /* Retry after delaying for ~100s.
*/
+#define RTAS_ML_ISOLATION_ERROR -9000 /* Multi-level isolation error. */
/* statuses specific to ibm,suspend-me */
#define RTAS_SUSPEND_ABORTED 9000 /* Suspension aborted */
--
2.41.0
