Commit 1549c42d authored by Stewart Smith's avatar Stewart Smith Committed by Michael Ellerman
Browse files

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: default avatarStewart Smith <stewart@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent efa9ace6

arch/powerpc/platforms/powernv/opal.c

+15 −8
Original line number Diff line number Diff line
@@ -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

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