linux-kernel - Re: [PATCH] drm/lima: Expose job_hang

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Message-ID: <CAKGbVbuV8meZji9PqFUwt4CpFEy6efpX63hJBgMY7fzAnZS4Rg@mail.gmail.com>
Date:   Thu, 18 Jun 2020 14:43:53 +0800
From:   Qiang Yu <yuq825@...il.com>
To:     Andrey Lebedev <andrey.lebedev@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        lima@...ts.freedesktop.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        andrey@...edev.lt
Subject: Re: [PATCH] drm/lima: Expose job_hang_limit module parameter

On Thu, Jun 18, 2020 at 1:57 AM Andrey Lebedev <andrey.lebedev@...il.com> wrote:
>
> From: Andrey Lebedev <andrey@...edev.lt>
>
> Some pp or gp jobs can be successfully repeated even after they time outs.
> Introduce lima module parameter to specify number of times a job can hang
> before being dropped.
>
> Signed-off-by: Andrey Lebedev <andrey@...edev.lt>
> ---
>
> Hello,
>
> This patch allows to work around a freezing problem as discussed in
> https://gitlab.freedesktop.org/lima/linux/-/issues/33
>
>  drivers/gpu/drm/lima/lima_drv.c   | 4 ++++
>  drivers/gpu/drm/lima/lima_drv.h   | 1 +
>  drivers/gpu/drm/lima/lima_sched.c | 5 +++--
>  3 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/lima/lima_drv.c b/drivers/gpu/drm/lima/lima_drv.c
> index a831565af813..2807eba26c55 100644
> --- a/drivers/gpu/drm/lima/lima_drv.c
> +++ b/drivers/gpu/drm/lima/lima_drv.c
> @@ -19,6 +19,7 @@
>  int lima_sched_timeout_ms;
>  uint lima_heap_init_nr_pages = 8;
>  uint lima_max_error_tasks;
> +int lima_job_hang_limit;

Better be an "uint" to avoid negative check. With this fixed, patch is:
Reviewed-by: Qiang Yu <yuq825@...il.com>

Regards,
Qiang

>
>  MODULE_PARM_DESC(sched_timeout_ms, "task run timeout in ms");
>  module_param_named(sched_timeout_ms, lima_sched_timeout_ms, int, 0444);
> @@ -29,6 +30,9 @@ module_param_named(heap_init_nr_pages, lima_heap_init_nr_pages, uint, 0444);
>  MODULE_PARM_DESC(max_error_tasks, "max number of error tasks to save");
>  module_param_named(max_error_tasks, lima_max_error_tasks, uint, 0644);
>
> +MODULE_PARM_DESC(job_hang_limit, "number of times to allow a job to hang before dropping it (default 0)");
> +module_param_named(job_hang_limit, lima_job_hang_limit, int, 0444);
> +
>  static int lima_ioctl_get_param(struct drm_device *dev, void *data, struct drm_file *file)
>  {
>         struct drm_lima_get_param *args = data;
> diff --git a/drivers/gpu/drm/lima/lima_drv.h b/drivers/gpu/drm/lima/lima_drv.h
> index fdbd4077c768..39fd98e3b14d 100644
> --- a/drivers/gpu/drm/lima/lima_drv.h
> +++ b/drivers/gpu/drm/lima/lima_drv.h
> @@ -11,6 +11,7 @@
>  extern int lima_sched_timeout_ms;
>  extern uint lima_heap_init_nr_pages;
>  extern uint lima_max_error_tasks;
> +extern int lima_job_hang_limit;
>
>  struct lima_vm;
>  struct lima_bo;
> diff --git a/drivers/gpu/drm/lima/lima_sched.c b/drivers/gpu/drm/lima/lima_sched.c
> index e6cefda00279..1602985dfa04 100644
> --- a/drivers/gpu/drm/lima/lima_sched.c
> +++ b/drivers/gpu/drm/lima/lima_sched.c
> @@ -503,8 +503,9 @@ int lima_sched_pipe_init(struct lima_sched_pipe *pipe, const char *name)
>
>         INIT_WORK(&pipe->recover_work, lima_sched_recover_work);
>
> -       return drm_sched_init(&pipe->base, &lima_sched_ops, 1, 0,
> -                             msecs_to_jiffies(timeout), name);
> +       return drm_sched_init(&pipe->base, &lima_sched_ops, 1,
> +                             lima_job_hang_limit, msecs_to_jiffies(timeout),
> +                             name);
>  }
>
>  void lima_sched_pipe_fini(struct lima_sched_pipe *pipe)
> --
> 2.25.1
>