diff options
| author | Stewart Smith <stewart@linux.ibm.com> | 2019-05-24 08:09:56 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-06-02 12:39:35 +0300 |
| commit | 1549c42deff5f3ffff326ae295ae58165e5c5830 (patch) | |
| tree | a642de316e920847c2ff510ece353935dcbe3923 | |
| parent | efa9ace68e487ddd29c2b4d6dd23242158f1f607 (diff) | |
| download | linux-1549c42deff5f3ffff326ae295ae58165e5c5830.tar.xz | |
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>
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal.c | 23 |
1 files 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 |