Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f972775b authored by Mike Marciniszyn's avatar Mike Marciniszyn Committed by Doug Ledford
Browse files

IB/hfi1: Wakeup QPs orphaned on wait list after flush 



Once an SDMA engine is taken down due to a link failure, any waiting QPs
that do not have outstanding descriptors in the ring will stay
on the dmawait list as long as the port is down.

Since there is no timer running, they will stay there for a long time.

The fix is to wake up all iowaits linked to dmawait. The send engine
will build and post packets that get flushed back.

Fixes: 77241056 ("IB/hfi1: add driver files")
Reviewed-by: default avatarKaike Wan <kaike.wan@intel.com>
Signed-off-by: default avatarMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: default avatarDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 4bb02e95

drivers/infiniband/hw/hfi1/sdma.c

+17 −0
Original line number Diff line number Diff line
@@ -405,6 +405,7 @@ static void sdma_flush(struct sdma_engine *sde) 
	struct sdma_txreq *txp, *txp_next;

	LIST_HEAD(flushlist);

	unsigned long flags;

	uint seq;



	/* flush from head to tail */

	sdma_flush_descq(sde);
@@ -415,6 +416,22 @@ static void sdma_flush(struct sdma_engine *sde) 
	/* flush from flush list */

	list_for_each_entry_safe(txp, txp_next, &flushlist, list)

		complete_tx(sde, txp, SDMA_TXREQ_S_ABORTED);

	/* wakeup QPs orphaned on the dmawait list */

	do {

		struct iowait *w, *nw;



		seq = read_seqbegin(&sde->waitlock);

		if (!list_empty(&sde->dmawait)) {

			write_seqlock(&sde->waitlock);

			list_for_each_entry_safe(w, nw, &sde->dmawait, list) {

				if (w->wakeup) {

					w->wakeup(w, SDMA_AVAIL_REASON);

					list_del_init(&w->list);

				}

			}

			write_sequnlock(&sde->waitlock);

		}

	} while (read_seqretry(&sde->waitlock, seq));

}



/*