/*
* Get the error information for errors coming through the
* FWNMI vectors. The pt_regs' r3 will be updated to reflect
* the actual r3 if possible, and a ptr to the error log entry
* will be returned if found.
*
* Use one buffer mce_data_buf per cpu to store RTAS error.
*
* The mce_data_buf does not have any locks or protection around it,
* if a second machine check comes in, or a system reset is done
* before we have logged the error, then we will get corruption in the
* error log. This is preferable over holding off on calling
* ibm,nmi-interlock which would result in us checkstopping if a
* second machine check did come in.
*/
static struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs)
{
unsigned long *savep;
struct rtas_error_log *h;
/* Mask top two bits */
regs->gpr[3] &= ~(0x3UL << 62);
if (!VALID_FWNMI_BUFFER(regs->gpr[3])) {
printk(KERN_ERR "FWNMI: corrupt r3 0x%016lx\n", regs->gpr[3]);
return NULL;
}
savep = __va(regs->gpr[3]);
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 */
memset(local_paca->mce_data_buf, 0, RTAS_ERROR_LOG_MAX);
if (!rtas_error_extended(h)) {
memcpy(local_paca->mce_data_buf, h, sizeof(__u64));
} else {
int len, error_log_length;
error_log_length = 8 + rtas_error_extended_log_length(h);
len = min_t(int, error_log_length, RTAS_ERROR_LOG_MAX);
memcpy(local_paca->mce_data_buf, h, len);
}
return (struct rtas_error_log *)local_paca->mce_data_buf;
}
/**
* Find a specific pseries error log in an RTAS extended event log.
* @log: RTAS error/event log
* @section_id: two character section identifier
*
* Returns a pointer to the specified errorlog or NULL if not found.
*/
struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
uint16_t section_id)
{
struct rtas_ext_event_log_v6 *ext_log =
(struct rtas_ext_event_log_v6 *)log->buffer;
struct pseries_errorlog *sect;
unsigned char *p, *log_end;
uint32_t ext_log_length = rtas_error_extended_log_length(log);
uint8_t log_format = rtas_ext_event_log_format(ext_log);
uint32_t company_id = rtas_ext_event_company_id(ext_log);
/* Check that we understand the format */
if (ext_log_length < sizeof(struct rtas_ext_event_log_v6) ||
log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG ||
company_id != RTAS_V6EXT_COMPANY_ID_IBM)
return NULL;
log_end = log->buffer + ext_log_length;
p = ext_log->vendor_log;
while (p < log_end) {
sect = (struct pseries_errorlog *)p;
if (pseries_errorlog_id(sect) == section_id)
return sect;
p += pseries_errorlog_length(sect);
}
return NULL;
}
/*
* Get the error information for errors coming through the
* FWNMI vectors. The pt_regs' r3 will be updated to reflect
* the actual r3 if possible, and a ptr to the error log entry
* will be returned if found.
*
* If the RTAS error is not of the extended type, then we put it in a per
* cpu 64bit buffer. If it is the extended type we use global_mce_data_buf.
*
* The global_mce_data_buf does not have any locks or protection around it,
* if a second machine check comes in, or a system reset is done
* before we have logged the error, then we will get corruption in the
* error log. This is preferable over holding off on calling
* ibm,nmi-interlock which would result in us checkstopping if a
* second machine check did come in.
*/
static struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs)
{
unsigned long *savep;
struct rtas_error_log *h, *errhdr = NULL;
/* Mask top two bits */
regs->gpr[3] &= ~(0x3UL << 62);
if (!VALID_FWNMI_BUFFER(regs->gpr[3])) {
printk(KERN_ERR "FWNMI: corrupt r3 0x%016lx\n", regs->gpr[3]);
return NULL;
}
savep = __va(regs->gpr[3]);
regs->gpr[3] = savep[0]; /* restore original r3 */
/* If it isn't an extended log we can use the per cpu 64bit buffer */
h = (struct rtas_error_log *)&savep[1];
if (!rtas_error_extended(h)) {
memcpy(this_cpu_ptr(&mce_data_buf), h, sizeof(__u64));
errhdr = (struct rtas_error_log *)this_cpu_ptr(&mce_data_buf);
} else {
int len, error_log_length;
error_log_length = 8 + rtas_error_extended_log_length(h);
len = max_t(int, error_log_length, RTAS_ERROR_LOG_MAX);
memset(global_mce_data_buf, 0, RTAS_ERROR_LOG_MAX);
memcpy(global_mce_data_buf, h, len);
errhdr = (struct rtas_error_log *)global_mce_data_buf;
}
return errhdr;
}
static void handle_rtas_event(const struct rtas_error_log *log)
{
if (rtas_error_type(log) != RTAS_TYPE_PRRN || !prrn_is_enabled())
return;
/* For PRRN Events the extended log length is used to denote
* the scope for calling rtas update-nodes.
*/
prrn_schedule_update(rtas_error_extended_log_length(log));
}
static int log_rtas_len(char * buf)
{
int len;
struct rtas_error_log *err;
uint32_t extended_log_length;
/* rtas fixed header */
len = 8;
err = (struct rtas_error_log *)buf;
extended_log_length = rtas_error_extended_log_length(err);
if (rtas_error_extended(err) && extended_log_length) {
/* extended header */
len += extended_log_length;
}
if (rtas_error_log_max == 0)
rtas_error_log_max = rtas_get_error_log_max();
if (len > rtas_error_log_max)
len = rtas_error_log_max;
return len;
}
