On Mon, 22 May 2023 12:50:34 -0700
Fan Ni <[email protected]> wrote:
> The 05/22/2023 16:09, Jonathan Cameron wrote:
> > From: Ira Weiny <[email protected]>
> >
> > CXL testing is benefited from an artificial event log injection
> > mechanism.
> >
> > Add an event log infrastructure to insert, get, and clear events from
> > the various logs available on a device.
> >
> > Replace the stubbed out CXL Get/Clear Event mailbox commands with
> > commands that operate on the new infrastructure.
> >
> > Signed-off-by: Ira Weiny <[email protected]>
> > Signed-off-by: Jonathan Cameron <[email protected]>
> > ---
>
> Reviewed-by: Fan Ni <[email protected]>
>
> See comments below in cxl_event_insert.
...
> > + memcpy(&entry->data, event, sizeof(*event));
> > +
> > + entry->data.hdr.handle = cpu_to_le16(log->next_handle);
> > + log->next_handle++;
> > + /* 0 handle is never valid */
> > + if (log->next_handle == 0) {
>
> next_handle is uint16_t, how can it be 0 after next_handle++?
Intent was to deal with wrap around.
We are fine with reusing handles after sufficiently long time that
there can't be a confusion, just not 0 as that has special
meaning when used to 'point' to a related event
(see definition of Related Event Record Handle)
>
> > + log->next_handle++;
> > + }
> > + entry->data.hdr.timestamp = cpu_to_le64(time);
> > +
> > + QSIMPLEQ_INSERT_TAIL(&log->events, entry, node);
> > + cxl_event_set_status(cxlds, log_type, true);
> > +
> > + /* Count went from 0 to 1 */
> > + return cxl_event_count(log) == 1;
> > +}
