The first machines to ship with OPAL firmware all got firmware updates
that have the new call, but just in case someone is foolish enough to
believe the first 4 months of firmware is the best, we keep this code
around.
Comment is updated to not refer to late 2014 as recent or the future.
Signed-off-by: Stewart Smith <stew...@linux.ibm.com>
---
arch/powerpc/platforms/powernv/opal.c | 23 +++++++++++++++--------
1 file changed, 15 insertions(+), 8 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/opal.c
b/arch/powerpc/platforms/powernv/opal.c
index f2b063b027f0..89b6ddc3ed38 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -206,16 +206,18 @@ static int __init opal_register_exception_handlers(void)
glue = 0x7000;
/*
- * Check if we are running on newer firmware that exports
- * OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to patch
- * the HMI interrupt and we catch it directly in Linux.
+ * Only ancient OPAL firmware requires this.
+ * Specifically, firmware from FW810.00 (released June 2014)
+ * through FW810.20 (Released October 2014).
*
- * For older firmware (i.e currently released POWER8 System Firmware
- * as of today <= SV810_087), we fallback to old behavior and let OPAL
- * patch the HMI vector and handle it inside OPAL firmware.
+ * Check if we are running on newer (post Oct 2014) firmware that
+ * exports the OPAL_HANDLE_HMI token. If yes, then don't ask OPAL to
+ * patch the HMI interrupt and we catch it directly in Linux.
*
- * For newer firmware (in development/yet to be released) we will
- * start catching/handling HMI directly in Linux.
+ * For older firmware (i.e < FW810.20), we fallback to old behavior and
+ * let OPAL patch the HMI vector and handle it inside OPAL firmware.
+ *
+ * For newer firmware we catch/handle the HMI directly in Linux.
*/
if (!opal_check_token(OPAL_HANDLE_HMI)) {
pr_info("Old firmware detected, OPAL handles HMIs.\n");
@@ -225,6 +227,11 @@ static int __init opal_register_exception_handlers(void)
glue += 128;
}
+ /*
+ * Only applicable to ancient firmware, all modern
+ * (post March 2015/skiboot 5.0) firmware will just return
+ * OPAL_UNSUPPORTED.
+ */
opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);
#endif
--
2.21.0
