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powerpc/powernv: Allow manually invoking special reboots 

OPAL provides several different kinds of reboot for the kernel to use,
namely forcing a full reboot, platform error reboot and MPIPL. Right now
triggering the alternative resets requires some ad-hoc method such as
triggering a kernel crash and hoping the stars align. It's sometimes handy
to be able to trigger one of these resets directly, so add a way to do
that.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191101085522.3055-2-oohall@gmail.com
This commit is contained in:
Oliver O'Halloran 2019-11-01 19:55:22 +11:00 committed by Michael Ellerman
parent 2d9b332d99
commit 37f6f8e88c
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/platforms/powernv/setup.c
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@ -233,6 +233,10 @@ static void __noreturn pnv_restart(char *cmd)
rc = opal_cec_reboot();
else if (strcmp(cmd, "full") == 0)
rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL);
else if (strcmp(cmd, "mpipl") == 0)
rc = opal_cec_reboot2(OPAL_REBOOT_MPIPL, NULL);
else if (strcmp(cmd, "error") == 0)
rc = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, NULL);
else
rc = OPAL_UNSUPPORTED;