Hi, Could you please use my gmail address, the one one I'm responding from--I don't want to miss any DRM scheduler patches. BTW, the luben.tui...@amd.com email should bounce as undeliverable.
On 2023-11-07 21:26, Danilo Krummrich wrote:
> Commit 56e449603f0a ("drm/sched: Convert the GPU scheduler to variable
> number of run-queues") introduces drm_err() in drm_sched_job_init(), in
> order to indicate that the given entity has no runq, however at this
> time job->sched is not yet set, likely to be NULL initialized, and hence
> shouldn't be used.
>
> Replace the corresponding drm_err() call with pr_err() to avoid a
> potential page fault.
>
> While at it, extend the documentation of drm_sched_job_init() to
> indicate that job->sched is not a valid pointer until
> drm_sched_job_arm() has been called.
>
> Fixes: 56e449603f0a ("drm/sched: Convert the GPU scheduler to variable number
> of run-queues")
> Signed-off-by: Danilo Krummrich <d...@redhat.com>
> ---
> drivers/gpu/drm/scheduler/sched_main.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/scheduler/sched_main.c
> b/drivers/gpu/drm/scheduler/sched_main.c
> index 27843e37d9b7..dd28389f0ddd 100644
> --- a/drivers/gpu/drm/scheduler/sched_main.c
> +++ b/drivers/gpu/drm/scheduler/sched_main.c
> @@ -680,6 +680,9 @@ EXPORT_SYMBOL(drm_sched_resubmit_jobs);
> * This function returns -ENOENT in this case (which probably should be -EIO
> as
> * a more meanigful return value).
> *
> + * Note that job->sched is not a valid pointer until drm_sched_job_arm() has
> + * been called.
> + *
Good catch!
Did you actually get this to page-fault and have a kernel log?
I'm asking because we see it correctly set in this kernel log coming from AMD,
[ 11.886024] amdgpu 0000:0a:00.0: [drm] *ERROR* drm_sched_job_init: entity
has no rq!
in this email,
https://lore.kernel.org/r/CADnq5_PS64jYS_Y3kGW27m-kuWP+FQFiaVcOaZiB=jlsgpn...@mail.gmail.com
> * Returns 0 for success, negative error code otherwise.
> */
> int drm_sched_job_init(struct drm_sched_job *job,
> @@ -691,7 +694,7 @@ int drm_sched_job_init(struct drm_sched_job *job,
> * or worse--a blank screen--leave a trail in the
> * logs, so this can be debugged easier.
> */
> - drm_err(job->sched, "%s: entity has no rq!\n", __func__);
> + pr_err("%s: entity has no rq!\n", __func__);
Is it feasible to do something like the following?
dev_err(job->sched ? job->sched->dev : NULL, "%s: entity has no
rq!\n", __func__);
> return -ENOENT;
> }
>
>
> base-commit: c015fb6d01adb616fb54824feb55ce5ab18e8ca1
--
Regards,
Luben
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