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powerpc/powernv: Update firmware archaeology around OPAL_HANDLE_HMI 

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 <stewart@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Stewart Smith 2019-05-24 15:09:56 +10:00 committed by Michael Ellerman
parent efa9ace68e
commit 1549c42def
1 changed files with 15 additions and 8 deletions
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23
arch/powerpc/platforms/powernv/opal.c
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@ -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