Commit 672e480a authored Feb 17, 2020 by Oliver O'Halloran Committed by Michael Ellerman Mar 04, 2020

powerpc/powernv: Add explicit fast-reboot support



Add a way to manually invoke a fast-reboot rather than setting the NVRAM
flag. The idea is to allow userspace to invoke a fast-reboot using the
optional string argument to the reboot() system call, or using the xmon
zr command so we don't need to leave around a persistent changes on
a system to use the feature.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200217024833.30580-2-oohall@gmail.com

parent 16985f2d

arch/powerpc/include/asm/opal-api.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -1067,6 +1067,7 @@ enum {
		OPAL_REBOOT_PLATFORM_ERROR = 1,
		OPAL_REBOOT_FULL_IPL = 2,
		OPAL_REBOOT_MPIPL = 3,
		OPAL_REBOOT_FAST = 4,
		};

		/* Argument to OPAL_PCI_TCE_KILL */

arch/powerpc/platforms/powernv/setup.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -237,6 +237,8 @@ static void __noreturn pnv_restart(char *cmd)
		rc = opal_cec_reboot2(OPAL_REBOOT_MPIPL, NULL);
		else if (strcmp(cmd, "error") == 0)
		rc = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, NULL);
		else if (strcmp(cmd, "fast") == 0)
		rc = opal_cec_reboot2(OPAL_REBOOT_FAST, NULL);
		else
		rc = OPAL_UNSUPPORTED;

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