diff options
Diffstat (limited to 'drivers/misc/cxl/sysfs.c')
| -rw-r--r-- | drivers/misc/cxl/sysfs.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/misc/cxl/sysfs.c b/drivers/misc/cxl/sysfs.c index a8b6d6a635e9..95285b7f636f 100644 --- a/drivers/misc/cxl/sysfs.c +++ b/drivers/misc/cxl/sysfs.c @@ -62,7 +62,19 @@ static ssize_t psl_timebase_synced_show(struct device *device, char *buf) { struct cxl *adapter = to_cxl_adapter(device); + u64 psl_tb, delta; + /* Recompute the status only in native mode */ + if (cpu_has_feature(CPU_FTR_HVMODE)) { + psl_tb = adapter->native->sl_ops->timebase_read(adapter); + delta = abs(mftb() - psl_tb); + + /* CORE TB and PSL TB difference <= 16usecs ? */ + adapter->psl_timebase_synced = (tb_to_ns(delta) < 16000) ? true : false; + pr_devel("PSL timebase %s - delta: 0x%016llx\n", + (tb_to_ns(delta) < 16000) ? "synchronized" : + "not synchronized", tb_to_ns(delta)); + } return scnprintf(buf, PAGE_SIZE, "%i\n", adapter->psl_timebase_synced); } |