diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c index fe14186a8cef..d20aecc52ece 100644 --- a/arch/powerpc/platforms/pseries/ras.c +++ b/arch/powerpc/platforms/pseries/ras.c @@ -406,6 +406,20 @@ static inline struct rtas_error_log *fwnmi_get_errlog(void) return (struct rtas_error_log *)local_paca->mce_data_buf; } +static __be64 *fwnmi_get_savep(struct pt_regs *regs) +{ + unsigned long savep_ra; + + /* Mask top two bits */ + savep_ra = regs->gpr[3] & ~(0x3UL << 62); + if (!VALID_FWNMI_BUFFER(savep_ra)) { + printk(KERN_ERR "FWNMI: corrupt r3 0x%016lx\n", regs->gpr[3]); + return NULL; + } + + return __va(savep_ra); +} + /* * Get the error information for errors coming through the * FWNMI vectors. The pt_regs' r3 will be updated to reflect @@ -423,20 +437,14 @@ static inline struct rtas_error_log *fwnmi_get_errlog(void) */ static struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs) { - unsigned long savep_ra; - unsigned long *savep; struct rtas_error_log *h; + __be64 *savep; - /* Mask top two bits */ - savep_ra = regs->gpr[3] & ~(0x3UL << 62); - - if (!VALID_FWNMI_BUFFER(savep_ra)) { - printk(KERN_ERR "FWNMI: corrupt r3 0x%016lx\n", regs->gpr[3]); + savep = fwnmi_get_savep(regs); + if (!savep) return NULL; - } - savep = __va(savep_ra); - regs->gpr[3] = be64_to_cpu(savep[0]); /* restore original r3 */ + regs->gpr[3] = be64_to_cpu(savep[0]); /* restore original r3 */ h = (struct rtas_error_log *)&savep[1]; /* Use the per cpu buffer from paca to store rtas error log */ @@ -483,11 +491,21 @@ int pSeries_system_reset_exception(struct pt_regs *regs) #endif if (fwnmi_active) { - struct rtas_error_log *errhdr = fwnmi_get_errinfo(regs); - if (errhdr) { - /* XXX Should look at FWNMI information */ - } - fwnmi_release_errinfo(); + __be64 *savep; + + /* + * Firmware (PowerVM and KVM) saves r3 to a save area like + * machine check, which is not exactly what PAPR (2.9) + * suggests but there is no way to detect otherwise, so this + * is the interface now. + * + * System resets do not save any error log or require an + * "ibm,nmi-interlock" rtas call to release. + */ + + savep = fwnmi_get_savep(regs); + if (savep) + regs->gpr[3] = be64_to_cpu(savep[0]); /* restore original r3 */ } if (smp_handle_nmi_ipi(regs))