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powerpc/powernv: Add explicit fast-reboot support

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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
This commit is contained in:
Oliver O'Halloran 2020-02-17 13:48:33 +11:00 • committed by Michael Ellerman
parent 16985f2d25
commit 672e480aa2
2 changed files with 3 additions and 0 deletions
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1
arch/powerpc/include/asm/opal-api.h
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@ -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 */

2
arch/powerpc/platforms/powernv/setup.c
View file

@ -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;