linux-kernel - Re: [PATCH] drm/panfrost: Queue jobs on the hardware

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Date:   Mon, 19 Aug 2019 12:02:16 -0500
From:   Rob Herring <robh@...nel.org>
To:     Steven Price <steven.price@....com>
Cc:     Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/panfrost: Queue jobs on the hardware

On Mon, Aug 19, 2019 at 11:58 AM Rob Herring <robh@...nel.org> wrote:
>
> On Fri, Aug 16, 2019 at 4:31 AM Steven Price <steven.price@....com> wrote:
> >
> > The hardware has a set of '_NEXT' registers that can hold a second job
> > while the first is executing. Make use of these registers to enqueue a
> > second job per slot.
> >
> > Signed-off-by: Steven Price <steven.price@....com>
> > ---
> > Note that this is based on top of Rob Herring's "per FD address space"
> > patch[1].
> >
> > [1] https://marc.info/?i=20190813150115.30338-1-robh%20()%20kernel%20!%20org
> >
> >  drivers/gpu/drm/panfrost/panfrost_device.h |  4 +-
> >  drivers/gpu/drm/panfrost/panfrost_job.c    | 76 ++++++++++++++++++----
> >  drivers/gpu/drm/panfrost/panfrost_mmu.c    |  2 +-
> >  3 files changed, 67 insertions(+), 15 deletions(-)
>
> LGTM, but I'll give Tomeu a chance to comment.

Though checkpatch reports some style nits:

-:46: CHECK:COMPARISON_TO_NULL: Comparison to NULL could be written
"!pfdev->jobs[slot][0]"
#46: FILE: drivers/gpu/drm/panfrost/panfrost_job.c:143:
+       if (pfdev->jobs[slot][0] == NULL)

-:48: CHECK:COMPARISON_TO_NULL: Comparison to NULL could be written
"!pfdev->jobs[slot][1]"
#48: FILE: drivers/gpu/drm/panfrost/panfrost_job.c:145:
+       if (pfdev->jobs[slot][1] == NULL)

-:53: CHECK:OPEN_ENDED_LINE: Lines should not end with a '('
#53: FILE: drivers/gpu/drm/panfrost/panfrost_job.c:150:
+static struct panfrost_job *panfrost_dequeue_job(

-:67: CHECK:COMPARISON_TO_NULL: Comparison to NULL could be written
"!pfdev->jobs[slot][0]"
#67: FILE: drivers/gpu/drm/panfrost/panfrost_job.c:164:
+       if (pfdev->jobs[slot][0] == NULL) {

-:71: CHECK:COMPARISON_TO_NULL: Comparison to NULL could be written
"pfdev->jobs[slot][1]"
#71: FILE: drivers/gpu/drm/panfrost/panfrost_job.c:168:
+       WARN_ON(pfdev->jobs[slot][1] != NULL);

-:160: ERROR:SPACING: space prohibited before that '--' (ctx:WxO)
#160: FILE: drivers/gpu/drm/panfrost/panfrost_job.c:497:
+                       jobs --;
                             ^

-:165: ERROR:SPACING: space required one side of that '--' (ctx:WxW)
#165: FILE: drivers/gpu/drm/panfrost/panfrost_job.c:500:
+               while (jobs -- > active) {
                            ^

-:204: CHECK:SPACING: spaces preferred around that '*' (ctx:VxV)
#204: FILE: drivers/gpu/drm/panfrost/panfrost_mmu.c:150:
+               WARN_ON(en >= NUM_JOB_SLOTS*2);
                                           ^