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

diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 8349860..11fdae8 100644 (file)
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -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;