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Message-ID: <20230523071452.2h2tilwrwejtmmrc@chromium.org>
Date: Tue, 23 May 2023 07:14:52 +0000
From: Tomasz Figa <tfiga@...omium.org>
To: Benjamin Gaignard <benjamin.gaignard@...labora.com>
Cc: m.szyprowski@...sung.com, mchehab@...nel.org, ming.qian@....com,
shijie.qin@....com, eagle.zhou@....com, bin.liu@...iatek.com,
matthias.bgg@...il.com, angelogioacchino.delregno@...labora.com,
tiffany.lin@...iatek.com, andrew-ct.chen@...iatek.com,
yunfei.dong@...iatek.com, stanimir.k.varbanov@...il.com,
quic_vgarodia@...cinc.com, agross@...nel.org, andersson@...nel.org,
konrad.dybcio@...aro.org, ezequiel@...guardiasur.com.ar,
p.zabel@...gutronix.de, daniel.almeida@...labora.com,
hverkuil-cisco@...all.nl, laurent.pinchart@...asonboard.com,
jernel@...nel.org, linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
linux-rockchip@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v2 4/8] media: videobuf2: Stop define VB2_MAX_FRAME as
global
On Tue, Mar 21, 2023 at 11:28:51AM +0100, Benjamin Gaignard wrote:
> After changing bufs arrays to a dynamic allocated array
> VB2_MAX_FRAME doesn't mean anything for videobuf2 core.
> Remove it from the core definitions but keep it for drivers internal
> needs.
This made me think that some drivers could behave really badly if they
get more than VB2_MAX_FRAME (or VIDEO_MAX_FRAME) buffers. I certainly
see some having fixed-size arrays of exactly that size. Should we have a
queue flag that enables more buffers, so it is only available for
drivers which can handle them?
Best regards,
Tomasz
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> ---
> drivers/media/common/videobuf2/videobuf2-core.c | 2 ++
> drivers/media/platform/amphion/vdec.c | 1 +
> .../media/platform/mediatek/vcodec/vdec/vdec_vp9_req_lat_if.c | 2 ++
> drivers/media/platform/qcom/venus/hfi.h | 2 ++
> drivers/media/platform/verisilicon/hantro_hw.h | 2 ++
> drivers/staging/media/ipu3/ipu3-v4l2.c | 2 ++
> include/media/videobuf2-core.h | 1 -
> include/media/videobuf2-v4l2.h | 4 ----
> 8 files changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
> index f4da917ccf3f..3c6ced360770 100644
> --- a/drivers/media/common/videobuf2/videobuf2-core.c
> +++ b/drivers/media/common/videobuf2/videobuf2-core.c
> @@ -31,6 +31,8 @@
>
> #include <trace/events/vb2.h>
>
> +#define VB2_MAX_FRAME 32
> +
> static int debug;
> module_param(debug, int, 0644);
>
> diff --git a/drivers/media/platform/amphion/vdec.c b/drivers/media/platform/amphion/vdec.c
> index 87f9f8e90ab1..bef0c1b869be 100644
> --- a/drivers/media/platform/amphion/vdec.c
> +++ b/drivers/media/platform/amphion/vdec.c
> @@ -28,6 +28,7 @@
>
> #define VDEC_MIN_BUFFER_CAP 8
> #define VDEC_MIN_BUFFER_OUT 8
> +#define VB2_MAX_FRAME 32
>
> struct vdec_fs_info {
> char name[8];
> diff --git a/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_req_lat_if.c b/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_req_lat_if.c
> index f5958b6d834a..ba208caf3043 100644
> --- a/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_req_lat_if.c
> +++ b/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_req_lat_if.c
> @@ -16,6 +16,8 @@
> #include "../vdec_drv_if.h"
> #include "../vdec_vpu_if.h"
>
> +#define VB2_MAX_FRAME 32
> +
> /* reset_frame_context defined in VP9 spec */
> #define VP9_RESET_FRAME_CONTEXT_NONE0 0
> #define VP9_RESET_FRAME_CONTEXT_NONE1 1
> diff --git a/drivers/media/platform/qcom/venus/hfi.h b/drivers/media/platform/qcom/venus/hfi.h
> index f25d412d6553..bd5ca5a8b945 100644
> --- a/drivers/media/platform/qcom/venus/hfi.h
> +++ b/drivers/media/platform/qcom/venus/hfi.h
> @@ -10,6 +10,8 @@
>
> #include "hfi_helper.h"
>
> +#define VB2_MAX_FRAME 32
> +
> #define VIDC_SESSION_TYPE_VPE 0
> #define VIDC_SESSION_TYPE_ENC 1
> #define VIDC_SESSION_TYPE_DEC 2
> diff --git a/drivers/media/platform/verisilicon/hantro_hw.h b/drivers/media/platform/verisilicon/hantro_hw.h
> index e83f0c523a30..9e8faf7ba6fb 100644
> --- a/drivers/media/platform/verisilicon/hantro_hw.h
> +++ b/drivers/media/platform/verisilicon/hantro_hw.h
> @@ -15,6 +15,8 @@
> #include <media/v4l2-vp9.h>
> #include <media/videobuf2-core.h>
>
> +#define VB2_MAX_FRAME 32
> +
> #define DEC_8190_ALIGN_MASK 0x07U
>
> #define MB_DIM 16
> diff --git a/drivers/staging/media/ipu3/ipu3-v4l2.c b/drivers/staging/media/ipu3/ipu3-v4l2.c
> index e530767e80a5..6627b5c2d4d6 100644
> --- a/drivers/staging/media/ipu3/ipu3-v4l2.c
> +++ b/drivers/staging/media/ipu3/ipu3-v4l2.c
> @@ -10,6 +10,8 @@
> #include "ipu3.h"
> #include "ipu3-dmamap.h"
>
> +#define VB2_MAX_FRAME 32
> +
> /******************** v4l2_subdev_ops ********************/
>
> #define IPU3_RUNNING_MODE_VIDEO 0
> diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
> index b8b34a993e04..4aa43c5c7c58 100644
> --- a/include/media/videobuf2-core.h
> +++ b/include/media/videobuf2-core.h
> @@ -21,7 +21,6 @@
> #include <media/media-request.h>
> #include <media/frame_vector.h>
>
> -#define VB2_MAX_FRAME (32)
> #define VB2_MAX_PLANES (8)
>
> /**
> diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h
> index 5a845887850b..88a7a565170e 100644
> --- a/include/media/videobuf2-v4l2.h
> +++ b/include/media/videobuf2-v4l2.h
> @@ -15,10 +15,6 @@
> #include <linux/videodev2.h>
> #include <media/videobuf2-core.h>
>
> -#if VB2_MAX_FRAME != VIDEO_MAX_FRAME
> -#error VB2_MAX_FRAME != VIDEO_MAX_FRAME
> -#endif
> -
> #if VB2_MAX_PLANES != VIDEO_MAX_PLANES
> #error VB2_MAX_PLANES != VIDEO_MAX_PLANES
> #endif
> --
> 2.34.1
>
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