LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Robert Foss <robert.foss@collabora.com>
To: Emil Velikov <emil.l.velikov@gmail.com>
Cc: David Airlie <airlied@linux.ie>,
	"Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>,
	ML dri-devel <dri-devel@lists.freedesktop.org>,
	"open list:VIRTIO GPU DRIVER" 
	<virtualization@lists.linux-foundation.org>,
	Gustavo Padovan <gustavo.padovan@collabora.com>,
	Gerd Hoffmann <kraxel@redhat.com>,
	Emil Velikov <emil.velikov@collabora.com>
Subject: Re: [PATCH 1/5] drm/virtio: add virtio_gpu_alloc_fence()
Date: Thu, 1 Nov 2018 13:43:51 +0100	[thread overview]
Message-ID: <1c92b6dc-4152-c81b-5180-2f48799b959f@collabora.com> (raw)
In-Reply-To: <CACvgo516JGdfBZ8zM73bQ-TCeNEbOp9ioBy9jh0AAtpUsu5tOg@mail.gmail.com>

Hey Emil,

On 2018-10-31 10:38, Emil Velikov wrote:
> Hi Rob,
> 
> On Thu, 25 Oct 2018 at 19:38, Robert Foss <robert.foss@collabora.com> wrote:
>>
>> From: Gustavo Padovan <gustavo.padovan@collabora.com>
>>
>> Refactor fence creation to remove the potential allocation failure from
>> the cmd_submit and atomic_commit paths. Now the fence should be allocated
>> first and just after we should proceed with the rest of the execution.
>>
> 
> Commit does a bit more that what the above says:
>   - dummy, factor out fence creation/destruction
>   - use per virtio_gpu_framebuffer fence
> 
> Personally I'd keep the two separate patches and elaborate on the latter.
> Obviously in that case, one will need to add 3 lines worth of
> virtio_gpu_fence_alloc() in virtio_gpu_cursor_plane_update which will be nuked
> with the next patch.
> 
> Not a big deal, but it's up-to the maintainer to make the final call if it's
> worth splitting or not.

Agreed, I'll hold off with this change until then.

> 
> Couple of minor nitpicks below.
> 
>>          struct virtio_gpu_device *vgdev = dev->dev_private;
>>          struct virtio_gpu_output *output = NULL;
>>          struct virtio_gpu_framebuffer *vgfb;
>> -       struct virtio_gpu_fence *fence = NULL;
>>          struct virtio_gpu_object *bo = NULL;
>>          uint32_t handle;
>>          int ret = 0;
> 
> Add the virtio_gpu_fence_alloc()? And yes it will be nuked with patch 2/...
> 
> 
> 
>> +struct virtio_gpu_fence *virtio_gpu_fence_alloc(struct virtio_gpu_device *vgdev)
>> +{
>> +       struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
>> +       struct virtio_gpu_fence *fence = kzalloc(sizeof(struct virtio_gpu_fence), GFP_ATOMIC);
>> +       if (!fence)
>> +               return fence;
>> +
>> +       fence->drv = drv;
>> +       dma_fence_init(&fence->f, &virtio_fence_ops, &drv->lock, drv->context, 0);
> Oh no, lines over 80 col... while the original code is pretty and neat.

Ack

> 
>> +
>> +       return fence;
>> +}
>> +
>> +void virtio_gpu_fence_cleanup(struct virtio_gpu_fence *fence)
>> +{
>> +       if (!fence)
>> +               return;
>> +
>> +       if (fence->drv)
>> +               dma_fence_put(&fence->f);
>> +       else
>> +               kfree(fence);
> I'm not sure if/how we reach the else case here?

That case should never be hit, and if it is that's a bug.
Fixed in v4.

> 
>> +}
>> +
>>   int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
>>                            struct virtio_gpu_ctrl_hdr *cmd_hdr,
>> -                         struct virtio_gpu_fence **fence)
>> +                         struct virtio_gpu_fence *fence)
>>   {
> 
> With a follow-up commit, we can drop the no longer needed return type.
> Which it turns out was never checked ...
> 

Fixed during drm-misc-next rebase for v4.

> 
> 
>> @@ -319,6 +332,8 @@ static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data,
>>                  dma_fence_put(&fence->f);
>>          }
>>          return 0;
>> +fail_fence:
> 
> The error labels seems to be called after what they do, not what
> fails. fail_backoff seems better IMHO.

Agreed. Fixed in v4.

> 
>> +ttm_eu_backoff_reservation(&ticket, &validate_list);
> Indentation seems off (or my client ate it)?

No, the indentation is bad here. Fixed in v4.

Thanks for the feedback Emil.

  reply	other threads:[~2018-11-01 12:44 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-25 18:37 [PATCH 0/5] virgl: fence fd support Robert Foss
2018-10-25 18:37 ` [PATCH 1/5] drm/virtio: add virtio_gpu_alloc_fence() Robert Foss
2018-10-31  9:38   ` Emil Velikov
2018-11-01 12:43     ` Robert Foss [this message]
2018-11-05  6:38       ` Gerd Hoffmann
2018-10-25 18:37 ` [PATCH 2/5] drm/virtio: add uapi for in and out explicit fences Robert Foss
2018-10-30  6:11   ` Gerd Hoffmann
2018-10-30 11:31     ` Emil Velikov
2018-10-30 13:52       ` Gerd Hoffmann
2018-10-30 15:48         ` Emil Velikov
2018-10-31  9:38   ` Emil Velikov
2018-11-01 12:56     ` Robert Foss
2018-11-02 13:34       ` Emil Velikov
2018-11-02 14:42         ` Robert Foss
2018-10-25 18:37 ` [PATCH 3/5] drm/virtio: add in-fences support for explicit synchronization Robert Foss
2018-10-31  9:38   ` Emil Velikov
2018-10-25 18:37 ` [PATCH 4/5] drm/virtio: add out-fences " Robert Foss
2018-10-31  9:39   ` Emil Velikov
2018-10-25 18:37 ` [PATCH 5/5] drm/virtio: bump driver version after explicit synchronization addition Robert Foss
2018-10-31  9:39   ` Emil Velikov
2018-10-31  9:45 ` [PATCH 0/5] virgl: fence fd support Emil Velikov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1c92b6dc-4152-c81b-5180-2f48799b959f@collabora.com \
    --to=robert.foss@collabora.com \
    --cc=airlied@linux.ie \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=emil.l.velikov@gmail.com \
    --cc=emil.velikov@collabora.com \
    --cc=gustavo.padovan@collabora.com \
    --cc=kraxel@redhat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=virtualization@lists.linux-foundation.org \
    --subject='Re: [PATCH 1/5] drm/virtio: add virtio_gpu_alloc_fence()' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).