queue-5.1/ib-hfi1-handle-wakeup-of-orphaned-qps-for-pio.patch

   1 From 931eaaa3e85d9818e48f799a8aa69a9d6fccfffa Mon Sep 17 00:00:00 2001
   2 From: Mike Marciniszyn <mike.marciniszyn@intel.com>
   3 Date: Fri, 14 Jun 2019 12:33:00 -0400
   4 Subject: IB/hfi1: Handle wakeup of orphaned QPs for pio
   5
   6 [ Upstream commit 099a884ba4c00145cef283d36e050726311c2e95 ]
   7
   8 Once a send context is taken down due to a link failure, any QPs waiting
   9 for pio credits will stay on the waitlist indefinitely.
  10
  11 Fix by wakeing up all QPs linked to piowait list.
  12
  13 Fixes: 7724105686e7 ("IB/hfi1: add driver files")
  14 Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
  15 Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
  16 Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
  17 Signed-off-by: Doug Ledford <dledford@redhat.com>
  18 Signed-off-by: Sasha Levin <sashal@kernel.org>
  19 ---
  20  drivers/infiniband/hw/hfi1/pio.c | 16 ++++++++++++++++
  21  1 file changed, 16 insertions(+)
  22
  23 diff --git a/drivers/infiniband/hw/hfi1/pio.c b/drivers/infiniband/hw/hfi1/pio.c
  24 index a1de566fe95e..1ee47838d4de 100644
  25 --- a/drivers/infiniband/hw/hfi1/pio.c
  26 +++ b/drivers/infiniband/hw/hfi1/pio.c
  27 @@ -952,6 +952,22 @@ void sc_disable(struct send_context *sc)
  28                 }
  29         }
  30         spin_unlock(&sc->release_lock);
  31 +
  32 +       write_seqlock(&sc->waitlock);
  33 +       while (!list_empty(&sc->piowait)) {
  34 +               struct iowait *wait;
  35 +               struct rvt_qp *qp;
  36 +               struct hfi1_qp_priv *priv;
  37 +
  38 +               wait = list_first_entry(&sc->piowait, struct iowait, list);
  39 +               qp = iowait_to_qp(wait);
  40 +               priv = qp->priv;
  41 +               list_del_init(&priv->s_iowait.list);
  42 +               priv->s_iowait.lock = NULL;
  43 +               hfi1_qp_wakeup(qp, RVT_S_WAIT_PIO | HFI1_S_WAIT_PIO_DRAIN);
  44 +       }
  45 +       write_sequnlock(&sc->waitlock);
  46 +
  47         spin_unlock_irq(&sc->alloc_lock);
  48  }
  49
  50 --
  51 2.20.1
  52