diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv/opal.c')
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index f084afa0e3ba..a2b53f292427 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -441,6 +441,7 @@ static int opal_recover_mce(struct pt_regs *regs, int opal_machine_check(struct pt_regs *regs) { struct machine_check_event evt; + int ret; if (!get_mce_event(&evt, MCE_EVENT_RELEASE)) return 0; @@ -455,6 +456,40 @@ int opal_machine_check(struct pt_regs *regs) if (opal_recover_mce(regs, &evt)) return 1; + + /* + * Unrecovered machine check, we are heading to panic path. + * + * We may have hit this MCE in very early stage of kernel + * initialization even before opal-prd has started running. If + * this is the case then this MCE error may go un-noticed or + * un-analyzed if we go down panic path. We need to inform + * BMC/OCC about this error so that they can collect relevant + * data for error analysis before rebooting. + * Use opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR) to do so. + * This function may not return on BMC based system. + */ + ret = opal_cec_reboot2(OPAL_REBOOT_PLATFORM_ERROR, + "Unrecoverable Machine Check exception"); + if (ret == OPAL_UNSUPPORTED) { + pr_emerg("Reboot type %d not supported\n", + OPAL_REBOOT_PLATFORM_ERROR); + } + + /* + * We reached here. There can be three possibilities: + * 1. We are running on a firmware level that do not support + * opal_cec_reboot2() + * 2. We are running on a firmware level that do not support + * OPAL_REBOOT_PLATFORM_ERROR reboot type. + * 3. We are running on FSP based system that does not need opal + * to trigger checkstop explicitly for error analysis. The FSP + * PRD component would have already got notified about this + * error through other channels. + * + * In any case, let us just fall through. We anyway heading + * down to panic path. + */ return 0; } |