Re: [PATCH v2] powerpc/powernv: Make possible for user to force a full ipl cec reboot
From: Vasant Hegde <hidden>
Date: 2018-09-05 06:32:15
On 09/03/2018 03:56 PM, Vaibhav Jain wrote:
Ever since fast reboot is enabled by default in opal, opal_cec_reboot() will use fast-reset instead of full IPL to perform system reboot. This leaves the user with no direct way to force a full IPL reboot except changing an nvram setting that persistently disables fast-reset for all subsequent reboots. This patch provides a more direct way for the user to force a one-shot full IPL reboot by passing the command line argument 'full' to the reboot command. So the user will be able to tweak the reboot behavior via:
.../...
quoted hunk ↗ jump to hunk
/* Argument to OPAL_PCI_TCE_KILL */diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c index adddde023622..650484e0940b 100644 --- a/arch/powerpc/platforms/powernv/setup.c +++ b/arch/powerpc/platforms/powernv/setup.c@@ -224,7 +224,22 @@ static void __noreturn pnv_restart(char *cmd) pnv_prepare_going_down(); while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { - rc = opal_cec_reboot(); + /* See if we need to do a full IPL reboot */ + if (cmd && strcmp(cmd, "full") == 0) + rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL); + else + rc = OPAL_UNSUPPORTED;
As discussed offline, please handle OPAL_SUCCESS case well. -Vasant