[PATCH 3/8] accel/ivpu: Stop job_done_thread on suspend

[Daniel Vetter]

This conflicts with the kthread change in 6.7-rc1 6309727ef271
("kthread: add kthread_stop_put")

Please double-check that the conflict resolution I've done in drm-tip
is correct and then ask drm-misc/accel maintainers to backmerge -rc2
to bake this in properly. Adding them as fyi.
-Sima


On Sat, 28 Oct 2023 at 18:00, Stanislaw Gruszka
<stanislaw.gruszka at linux.intel.com> wrote:
>
> Stop job_done thread when going to suspend. Use kthread_park() instead
> of kthread_stop() to avoid memory allocation and potential failure
> on resume.
>
> Use separate function as thread wake up condition. Use spin lock to assure
> rx_msg_list is properly protected against concurrent access.
>
> Reviewed-by: Karol Wachowski <karol.wachowski at linux.intel.com>
> Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka at linux.intel.com>
> ---
>  drivers/accel/ivpu/ivpu_drv.c |  2 ++
>  drivers/accel/ivpu/ivpu_ipc.c | 17 +++++++++++++++--
>  drivers/accel/ivpu/ivpu_job.c | 20 ++++++++++++++++----
>  drivers/accel/ivpu/ivpu_job.h |  2 ++
>  4 files changed, 35 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/accel/ivpu/ivpu_drv.c b/drivers/accel/ivpu/ivpu_drv.c
> index 064cabef41bb..60277ff6af69 100644
> --- a/drivers/accel/ivpu/ivpu_drv.c
> +++ b/drivers/accel/ivpu/ivpu_drv.c
> @@ -378,6 +378,7 @@ int ivpu_boot(struct ivpu_device *vdev)
>         enable_irq(vdev->irq);
>         ivpu_hw_irq_enable(vdev);
>         ivpu_ipc_enable(vdev);
> +       ivpu_job_done_thread_enable(vdev);
>         return 0;
>  }
>
> @@ -389,6 +390,7 @@ int ivpu_shutdown(struct ivpu_device *vdev)
>         disable_irq(vdev->irq);
>         ivpu_ipc_disable(vdev);
>         ivpu_mmu_disable(vdev);
> +       ivpu_job_done_thread_disable(vdev);
>
>         ret = ivpu_hw_power_down(vdev);
>         if (ret)
> diff --git a/drivers/accel/ivpu/ivpu_ipc.c b/drivers/accel/ivpu/ivpu_ipc.c
> index d069d1e1f91d..270caef789bf 100644
> --- a/drivers/accel/ivpu/ivpu_ipc.c
> +++ b/drivers/accel/ivpu/ivpu_ipc.c
> @@ -202,6 +202,20 @@ ivpu_ipc_send(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons, struct v
>         return ret;
>  }
>
> +static int ivpu_ipc_rx_need_wakeup(struct ivpu_ipc_consumer *cons)
> +{
> +       int ret = 0;
> +
> +       if (IS_KTHREAD())
> +               ret |= (kthread_should_stop() || kthread_should_park());
> +
> +       spin_lock_irq(&cons->rx_msg_lock);
> +       ret |= !list_empty(&cons->rx_msg_list);
> +       spin_unlock_irq(&cons->rx_msg_lock);
> +
> +       return ret;
> +}
> +
>  int ivpu_ipc_receive(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons,
>                      struct ivpu_ipc_hdr *ipc_buf,
>                      struct vpu_jsm_msg *ipc_payload, unsigned long timeout_ms)
> @@ -211,8 +225,7 @@ int ivpu_ipc_receive(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons,
>         int wait_ret, ret = 0;
>
>         wait_ret = wait_event_interruptible_timeout(cons->rx_msg_wq,
> -                                                   (IS_KTHREAD() && kthread_should_stop()) ||
> -                                                   !list_empty(&cons->rx_msg_list),
> +                                                   ivpu_ipc_rx_need_wakeup(cons),
>                                                     msecs_to_jiffies(timeout_ms));
>
>         if (IS_KTHREAD() && kthread_should_stop())
> diff --git a/drivers/accel/ivpu/ivpu_job.c b/drivers/accel/ivpu/ivpu_job.c
> index 6e96c921547d..a245b2d44db7 100644
> --- a/drivers/accel/ivpu/ivpu_job.c
> +++ b/drivers/accel/ivpu/ivpu_job.c
> @@ -590,6 +590,11 @@ static int ivpu_job_done_thread(void *arg)
>                                 ivpu_pm_schedule_recovery(vdev);
>                         }
>                 }
> +               if (kthread_should_park()) {
> +                       ivpu_dbg(vdev, JOB, "Parked %s\n", __func__);
> +                       kthread_parkme();
> +                       ivpu_dbg(vdev, JOB, "Unparked %s\n", __func__);
> +               }
>         }
>
>         ivpu_ipc_consumer_del(vdev, &cons);
> @@ -610,9 +615,6 @@ int ivpu_job_done_thread_init(struct ivpu_device *vdev)
>                 return -EIO;
>         }
>
> -       get_task_struct(thread);
> -       wake_up_process(thread);
> -
>         vdev->job_done_thread = thread;
>
>         return 0;
> @@ -620,6 +622,16 @@ int ivpu_job_done_thread_init(struct ivpu_device *vdev)
>
>  void ivpu_job_done_thread_fini(struct ivpu_device *vdev)
>  {
> +       kthread_unpark(vdev->job_done_thread);
>         kthread_stop(vdev->job_done_thread);
> -       put_task_struct(vdev->job_done_thread);
> +}
> +
> +void ivpu_job_done_thread_disable(struct ivpu_device *vdev)
> +{
> +       kthread_park(vdev->job_done_thread);
> +}
> +
> +void ivpu_job_done_thread_enable(struct ivpu_device *vdev)
> +{
> +       kthread_unpark(vdev->job_done_thread);
>  }
> diff --git a/drivers/accel/ivpu/ivpu_job.h b/drivers/accel/ivpu/ivpu_job.h
> index aa1f0b9479b0..a8e914e5affc 100644
> --- a/drivers/accel/ivpu/ivpu_job.h
> +++ b/drivers/accel/ivpu/ivpu_job.h
> @@ -61,6 +61,8 @@ void ivpu_cmdq_reset_all_contexts(struct ivpu_device *vdev);
>
>  int ivpu_job_done_thread_init(struct ivpu_device *vdev);
>  void ivpu_job_done_thread_fini(struct ivpu_device *vdev);
> +void ivpu_job_done_thread_disable(struct ivpu_device *vdev);
> +void ivpu_job_done_thread_enable(struct ivpu_device *vdev);
>
>  void ivpu_jobs_abort_all(struct ivpu_device *vdev);
>
> --
> 2.25.1
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch