linux-kernel - Re: [PATCH v2 27/29] venus: implementing multi-stream support

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Date:   Thu, 31 May 2018 18:51:41 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        vgarodia@...eaurora.org
Subject: Re: [PATCH v2 27/29] venus: implementing multi-stream support

On Tue, May 15, 2018 at 5:00 PM Stanimir Varbanov
<stanimir.varbanov@...aro.org> wrote:
>
> This is implementing a multi-stream decoder support. The multi
> stream gives an option to use the secondary decoder output
> with different raw format (or the same in case of crop).
>
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> ---
>  drivers/media/platform/qcom/venus/core.h    |   1 +
>  drivers/media/platform/qcom/venus/helpers.c | 204 +++++++++++++++++++++++++++-
>  drivers/media/platform/qcom/venus/helpers.h |   6 +
>  drivers/media/platform/qcom/venus/vdec.c    |  91 ++++++++++++-
>  drivers/media/platform/qcom/venus/venc.c    |   1 +
>  5 files changed, 299 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
> index 4d6c05f156c4..85e66e2dd672 100644
> --- a/drivers/media/platform/qcom/venus/core.h
> +++ b/drivers/media/platform/qcom/venus/core.h
> @@ -259,6 +259,7 @@ struct venus_inst {
>         struct list_head list;
>         struct mutex lock;
>         struct venus_core *core;
> +       struct list_head dpbbufs;
>         struct list_head internalbufs;
>         struct list_head registeredbufs;
>         struct list_head delayed_process;
> diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
> index ed569705ecac..87dcf9973e6f 100644
> --- a/drivers/media/platform/qcom/venus/helpers.c
> +++ b/drivers/media/platform/qcom/venus/helpers.c
> @@ -85,6 +85,112 @@ bool venus_helper_check_codec(struct venus_inst *inst, u32 v4l2_pixfmt)
>  }
>  EXPORT_SYMBOL_GPL(venus_helper_check_codec);
>
> +static int venus_helper_queue_dpb_bufs(struct venus_inst *inst)
> +{
> +       struct intbuf *buf;
> +       int ret = 0;
> +
> +       if (list_empty(&inst->dpbbufs))
> +               return 0;

Does this special case give us anything other than few more source lines?

> +
> +       list_for_each_entry(buf, &inst->dpbbufs, list) {
> +               struct hfi_frame_data fdata;
> +
> +               memset(&fdata, 0, sizeof(fdata));
> +               fdata.alloc_len = buf->size;
> +               fdata.device_addr = buf->da;
> +               fdata.buffer_type = buf->type;
> +
> +               ret = hfi_session_process_buf(inst, &fdata);
> +               if (ret)
> +                       goto fail;
> +       }
> +
> +fail:
> +       return ret;
> +}
> +
> +int venus_helper_free_dpb_bufs(struct venus_inst *inst)
> +{
> +       struct intbuf *buf, *n;
> +
> +       if (list_empty(&inst->dpbbufs))
> +               return 0;

Ditto.

> +
> +       list_for_each_entry_safe(buf, n, &inst->dpbbufs, list) {
> +               list_del_init(&buf->list);
> +               dma_free_attrs(inst->core->dev, buf->size, buf->va, buf->da,
> +                              buf->attrs);
> +               kfree(buf);
> +       }
> +
> +       INIT_LIST_HEAD(&inst->dpbbufs);
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL_GPL(venus_helper_free_dpb_bufs);
[snip]
> +int venus_helper_get_out_fmts(struct venus_inst *inst, u32 v4l2_fmt,
> +                             u32 *out_fmt, u32 *out2_fmt, bool ubwc)
> +{
> +       struct venus_core *core = inst->core;
> +       struct venus_caps *caps;
> +       u32 ubwc_fmt, fmt = to_hfi_raw_fmt(v4l2_fmt);
> +       bool found, found_ubwc;
> +
> +       *out_fmt = *out2_fmt = 0;
> +
> +       if (!fmt)
> +               return -EINVAL;
> +
> +       caps = venus_caps_by_codec(core, inst->hfi_codec, inst->session_type);
> +       if (!caps)
> +               return -EINVAL;
> +
> +       if (ubwc) {
> +               ubwc_fmt = fmt | HFI_COLOR_FORMAT_UBWC_BASE;

Does the UBWC base format have to be the same as fmt? Looking at
HFI_COLOR_FORMAT_* macros, UBWC variants seem to exist only for few
selected raw formats, for example there is none for NV21.

Best regards,
Tomasz